CN114335072A - Curved display panel and manufacturing method thereof, curved display device, and electronic equipment - Google Patents

Abstract

The embodiment of the application provides a curved surface display panel, a manufacturing method thereof and a curved surface display device, relates to the technical field of display, and aims to improve the consistency of the light-emitting brightness of a curved surface display area and a flat surface display area under a normal viewing angle and improve the color cast of the curved surface display area. The curved surface display panel includes: the display area comprises a plane display area and a curved surface display area; the array substrate comprises a substrate base plate and a substrate, wherein the substrate base plate is provided with an array layer, the array layer is provided with pixels, and the pixels comprise sub-pixels; the grating layer is positioned on one side of the array layer, which is back to the substrate base plate, and comprises a grating structure positioned in the curved surface display area; the grating structure comprises first grating units, wherein one first grating unit covers one first color sub-pixel, and a first color light signal generated by the first color sub-pixel is emitted out through the first grating unit; the curved surface display area comprises a first curved surface area and a second curved surface area, the bending curvature of the first curved surface area is smaller than that of the second curved surface area, and the grating period of the first grating unit of the first curved surface area is larger than that of the first grating unit of the second curved surface area.

Description

Curved display panel and manufacturing method thereof, curved display device, and electronic equipment

technical field

The present invention relates to the field of display technology, and more particularly, to a curved display panel and a manufacturing method thereof, a curved display device and electronic equipment.

Background technique

With the continuous development of display technology, the application forms of display panels have gradually increased. Among them, curved display panels have become the mainstream application forms in display devices such as mobile phones because they can provide users with an immersive and borderless visual experience. Ground, with the improvement of the 3D lamination process, the curved display area in the curved display panel can be bent close to 90°, so that the curved display panel can form a "waterfall screen" or "ring screen", which brings more extreme to the user. user experience.

FIG. 1 is a schematic structural diagram of a curved display panel in the prior art. As shown in FIG. 1 , the curved display panel includes a flat display area 1 ′ and a curved display area 2 ′, wherein the flat display area 1 ′ refers to a non-curved display area. In the display area, when the user watches or operates the display screen, the user's viewing angle is generally perpendicular to the plane where the flat display area 1' is located, that is, in the front viewing angle direction PP'. Since the curved display area 2' is curved compared to the flat display area 1', as the degree of curvature of the curved display area 2' increases, the light emitted by the sub-pixels 3' in the curved display area 2' will be larger to a greater extent. Deviating from the front viewing angle direction PP', the output is inclined, so that the brightness of the light in the front viewing angle direction PP' is reduced, resulting in a large brightness difference between the curved display area 2' and the flat display area 1' in the front viewing angle direction PP', which in turn leads to A color shift phenomenon occurs in the curved display area 2'. For example, when a picture with a white background color is displayed, the curved display area 2' will show a more obvious "blue" phenomenon. In particular, in the "waterfall screen" or "ring screen", the color shift phenomenon in the curved display area 2' is particularly serious, which seriously affects the user experience.

Therefore, how to effectively improve the color shift phenomenon in the curved display area 2' has become a technical problem to be solved at present.

SUMMARY OF THE INVENTION

In view of this, the present application provides a curved display panel, a method for manufacturing the same, and a curved display device, which improve the consistency of the light output brightness of the curved display area and the flat display area under the front viewing angle, and effectively improve the color shift of the curved display area. Phenomenon.

In a first aspect, an embodiment of the present application provides a curved display panel, including:

a display area, the display area includes a flat display area and a curved display area;

a base substrate, the side of the base substrate facing the light-emitting direction of the curved display panel is provided with an array layer, a plurality of pixels are arranged in the array layer, and each of the pixels includes a plurality of sub-pixels;

a grating layer, the grating layer is located on the side of the array layer facing away from the base substrate, and the grating layer includes a grating structure located in the curved display area;

Wherein, the grating structure includes a plurality of first grating units, one of the first grating units covers one sub-pixel of the first color, and the sub-pixel of the first color refers to the sub-pixel used to generate the light signal of the first color, The first color is any one of the colors of light signals generated by a plurality of sub-pixels in the array layer, and the first color light signals generated by the sub-pixels of the first color pass through the first grating unit shoot out;

The curved display area includes a first curved area and a second curved area, the curvature of the first curved area is smaller than that of the second curved area, and the first grating located in the first curved area The grating period of the unit is greater than the grating period of the first grating unit located in the second curved surface area.

In some embodiments, along an extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the curved curvature of the curved display area increases, and a plurality of the grating structures The grating period of the first grating unit decreases;

Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far away from the flat display area.

Further, the grating periods of the plurality of first grating units in the grating structure decrease linearly.

In some embodiments, the diffraction efficiencies of the plurality of first grating units in the grating structure are progressively increased.

In some embodiments, each of the pixels includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, the grating structure includes a red grating unit, a green grating unit and a blue grating unit, wherein the red grating The unit covers the red sub-pixel, the red light signal generated by the red sub-pixel is emitted through the red grating unit, the green grating unit covers the green sub-pixel, and the green light signal generated by the green sub-pixel passes through the the green grating unit emits, the blue grating unit covers the blue sub-pixel, and the blue light signal generated by the blue sub-pixel is emitted through the blue grating unit;

For the same pixel, the grating period of the red grating unit covering the red sub-pixel is Pr, the grating period of the green grating unit covering the green sub-pixel is Pg, and the grating period of the blue sub-pixel covering the The grating period of the blue grating unit is Pb, Pr>Pg>Pb.

In some embodiments, the grating structure includes a plurality of microstructures and a plurality of slits, a plurality of the microstructures are arranged at intervals in the curved display area, and the slits are located at two adjacent microstructures In between, the microstructures are used to refract and/or scatter the light emitted by the sub-pixels.

Further, along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the curved curvature of the curved display area increases, and the plurality of microstructures in the grating structure have an increasing curvature. Increased degree of light scattering and/or light refraction;

Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far away from the flat display area.

In some embodiments, along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the heights of the plurality of microstructures in the respective directions perpendicular to the cutting plane of the base substrate increase in height , the cut plane of the base substrate is a cut plane of the base substrate at a position corresponding to the center point of the microstructure.

In some embodiments, the microstructure has a first cross-section, and the first cross-section is parallel to a tangent plane of the base substrate, and the tangent plane of the base substrate is between the base substrate and the microstructure. The center point of the structure corresponds to the tangent plane at the position, and the shape of the first section is a rectangle, a triangle, an ellipse, a circle or a rhombus.

In some embodiments, the microstructures are strip-like structures, in the curved display area, a plurality of the microstructures are arranged along the first direction, and each of the microstructures extends along the second direction, The first direction is an extension direction along the inner edge of the curved display area to the outer edge of the curved display area, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is The edge is away from the flat display area, and the second direction intersects the first direction.

In some embodiments, the curved display panel further includes:

The curved display panel further includes an encapsulation layer, a functional layer, an adhesive layer, a cover plate and a protective film arranged in layers:

the encapsulation layer is used to encapsulate the array layer;

the functional layer is located on the side of the encapsulation layer facing away from the base substrate;

the adhesive layer is located on the side of the functional layer facing away from the base substrate;

the cover plate is located on the side of the adhesive layer facing away from the base substrate;

the protective film is located on the side of the cover plate facing away from the base substrate;

Wherein, the functional layer includes the grating structure;

Or, the adhesive layer includes the grating structure;

Or, the cover plate includes the grating structure;

Or, the protective film includes the grating structure.

Further, the functional layer includes a laminated touch layer and a polarizer;

The touch layer is disposed on the side of the encapsulation layer facing away from the base substrate, the touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on the side of the touch electrode layer facing away from the substrate. one side of the base substrate;

the polarizer is arranged on the side of the insulating layer facing away from the base substrate;

Wherein, the insulating layer includes the grating structure.

In some embodiments, the curved display panel further includes a laminated encapsulation layer, a functional layer, an adhesive layer, a cover plate and a protective film;

the encapsulation layer is used to encapsulate the array layer;

the functional layer is located on the side of the encapsulation layer facing away from the base substrate;

the adhesive layer is located on the side of the functional layer facing away from the base substrate;

the cover plate is located on the side of the adhesive layer facing away from the base substrate;

the protective film is located on the side of the cover plate facing away from the base substrate;

The grating layer is located between the encapsulation layer and the adhesive layer, or the grating layer is located between the adhesive layer and the cover plate.

Further, the functional layer includes a laminated touch layer and a polarizer;

The touch layer is disposed on the side of the encapsulation layer facing away from the base substrate, the touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on the side of the touch electrode layer facing away from the substrate. one side of the base substrate;

the polarizer is arranged on the side of the insulating layer facing away from the base substrate;

The grating layer is located between the touch layer and the polarizer, or the grating layer is located between the polarizer and the adhesive layer.

In some embodiments, the grating layer further includes a substrate for carrying the microstructures, and the microstructures are formed from a photosensitive adhesive material.

Based on the same inventive concept, an embodiment of the present application further provides a curved display device, including a middle frame and the above curved display panel, wherein the curved display panel is located in a accommodating cavity formed by the middle frame.

Based on the same inventive concept, an embodiment of the present application further provides an electronic device, including the above-mentioned curved display panel and an image processor, wherein the image processor is used for processing an image displayed on the curved display panel.

Based on the same inventive concept, an embodiment of the present application also provides a method for manufacturing a curved display panel, the curved display panel includes a display area, the display area includes a flat display area and a curved display area, and the curved display area includes a first a curved area and a second curved area, the curvature of the first curved area is smaller than the curved curvature of the second curved area;

The manufacturing method includes:

forming an array layer on the base substrate, the array layer is provided with a plurality of pixels, each of the pixels includes a plurality of sub-pixels;

A grating layer is formed on the side of the array layer facing away from the base substrate, and the grating layer includes a grating structure located in the curved display area, wherein the grating structure includes a plurality of first grating units, one of which is The first grating unit covers a sub-pixel of the first color, and the sub-pixel of the first color refers to the sub-pixel used to generate the light signal of the first color, and the first color is generated by the plurality of sub-pixels in the array layer. any one of the colors of the generated optical signals, the first color optical signals generated by the sub-pixels of the first color are emitted through the first grating unit; the first grating located in the first curved surface area The grating period of the unit is greater than the grating period of the first grating unit located in the second curved surface area.

In some embodiments, forming the grating layer includes:

A plurality of microstructures and a plurality of slits are formed, a plurality of the microstructures are arranged at intervals in the curved display area, the slits are located between two adjacent microstructures, and the microstructures are used to The light emitted by the sub-pixels is refracted and/or scattered.

In some embodiments, after forming the array layer on the base substrate, the fabrication method further includes:

forming an encapsulation layer on the side of the array layer facing away from the base substrate;

forming a functional layer on the side of the encapsulation layer facing away from the base substrate;

forming an adhesive layer on the side of the functional layer facing away from the base substrate;

attaching a cover plate on the side of the adhesive layer facing away from the base substrate;

forming a protective film on the side of the cover plate facing away from the base substrate;

Wherein, the functional layer includes the grating structure; or the adhesive layer includes the grating structure; or the cover plate includes the grating structure; or the protective film includes the grating structure.

Further, when the functional layer includes the grating structure, the process of forming the functional layer includes:

forming a touch electrode layer on the side of the encapsulation layer facing away from the base substrate;

An insulating layer is formed on the side of the touch electrode layer facing away from the base substrate, the insulating layer is etched, and a plurality of the microstructures are formed in the curved display area;

A polarizer is arranged on the side of the insulating layer facing away from the base substrate.

Further, when the cover plate includes the grating structure, the process of forming the cover plate includes:

The slits are cut on the side of the cover plate facing away from the base substrate by a laser process, or the slits are formed on the side of the cover plate facing the base substrate by a thermal bending process. described microstructure.

In some embodiments, after forming the array layer on the base substrate, the fabrication method further includes:

forming an encapsulation layer on the side of the array layer facing away from the base substrate;

forming a functional layer on the side of the encapsulation layer facing away from the base substrate;

forming an adhesive layer on the side of the functional layer facing away from the base substrate;

attaching a cover plate on the side of the adhesive layer facing away from the base substrate;

forming a protective film on the side of the cover plate facing away from the base substrate;

Wherein, the grating layer is located between the encapsulation layer and the adhesive layer, or the grating layer is located between the adhesive layer and the cover plate.

Further, the process of forming the grating layer includes:

attaching the substrate to a transfer mold, the transfer mold comprising grooves for forming the microstructure;

Filling the gap between the base material and the transfer mold with a photosensitive adhesive material;

curing the photosensitive adhesive material;

Remove the transfer mold.

The curved display panel and the manufacturing method thereof, the curved display device and the electronic equipment provided by the present application have the following beneficial effects:

其中，α为入射至光栅结构的入射光的入射角，β为衍射后的衍射光的衍射角，n1为入射光所处介质的折射率，n2为衍射光所处介质的折射率，λ为入射至光栅结构的入射光的波长，P为光栅周期，m为衍射级数，m＝0、±1、±2、…，并且，m为负值时，衍射光偏离法线一侧，sinβ为正值，m为正值时，衍射光偏离法线另一侧，sinβ为负值，可知，同一级衍射中衍射角β与光栅周期P呈反比，光栅周期P越小，某个非0级衍射的衍射角β越大，因此，在覆盖第一颜色的子像素的第一光栅单元中，通过使第二曲面区中第一光栅单元的光栅周期P2小于第一曲面区中第一光栅单元的光栅周期，可以使第一曲面区中的衍射光具有较小的衍射角，而第二曲面区中的衍射光具有较大的衍射角β2，从而实现对第一曲面区和第二曲面区中衍射光的衍射角进行不同程度的调整，使得第一曲面区和第二曲面区中的衍射光均趋近于正视角方向射出。In the technical solution provided by the embodiment of the present invention, by arranging a grating layer in the curved display area, when the light emitted by the sub-pixels in the curved display area enters the grating layer, diffraction will occur in the grating structure, and the diffracted light will be diffracted in the grating structure. The propagation direction of the light changes, so that part of the light is emitted in the direction of the positive viewing angle. Further, in the first curved surface area with a small degree of curvature, for the light emitted by the sub-pixels in this area, the diffracted diffracted light only needs to deviate from the normal by a small angle to be emitted close to the frontal viewing angle direction, that is, , in this area, if you want to improve the brightness of the light at the front viewing angle, you only need to control the diffracted light to have a smaller diffraction angle; and in the second curved area with a larger degree of curvature, for the light emitted by the sub-pixels in this area In other words, the diffracted diffracted light needs to deviate from the normal at a large angle to be emitted close to the frontal viewing angle. That is to say, in this area, if you want to improve the brightness of the light at the frontal viewing angle, you need to control the diffracted light to have a larger diffraction angle. . And according to the grating formula

Among them, α is the incident angle of the incident light incident on the grating structure, β is the diffraction angle of the diffracted light after diffraction, n1 is the refractive index of the medium where the incident light is located, n2 is the refractive index of the medium where the diffracted light is located, and λ is The wavelength of the incident light incident on the grating structure, P is the grating period, m is the diffraction order, m=0, ±1, ±2, ..., and, when m is a negative value, the diffracted light deviates from the normal side, sinβ is a positive value, when m is a positive value, the diffracted light deviates from the other side of the normal line, and sinβ is a negative value. It can be seen that the diffraction angle β in the same order of diffraction is inversely proportional to the grating period P, the smaller the grating period P, the less a certain non-zero value is The larger the diffraction angle β of order diffraction is, therefore, in the first grating unit covering the sub-pixels of the first color, by making the grating period P2 of the first grating unit in the second curved area smaller than the first grating in the first curved area The grating period of the unit can make the diffracted light in the first curved area have a smaller diffraction angle, while the diffracted light in the second curved area has a larger diffraction angle β2, so as to realize the first curved area and the second curved area. The diffraction angle of the diffracted light in the area is adjusted to different degrees, so that the diffracted light in the first curved area and the second curved area both tend to be emitted in a direction of a positive viewing angle.

It can be seen that, using the technical solution provided by the embodiment of the present invention, in the first grating unit covering the sub-pixels of the first color, the grating period P2 of the first grating unit in the second curved area is smaller than the first grating period P2 in the first curved area. The grating period P2 of a grating unit can adjust the diffraction angle of diffracted light in areas with different degrees of curvature to different degrees, so that the diffracted light in each area of the curved display area tends to be emitted in the direction of the positive viewing angle, which effectively improves the Improve the consistency of the brightness of different areas of the curved display area under the front viewing angle, and then improve the consistency of the brightness of the curved display area and the flat display area under the front viewing angle, significantly improve the color shift phenomenon of the curved display area, and optimize the display performance.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a curved display panel in the prior art;

FIG. 2 is another structural schematic diagram of a curved display panel in the prior art;

FIG. 3 is a schematic structural diagram of a curved display panel provided by an embodiment of the present invention;

FIG. 4 is a cross-sectional view of FIG. 3 along the A1-A2 direction;

FIG. 5 is a schematic structural diagram of a first grating unit according to an embodiment of the present invention;

6 is a schematic diagram of a grating period of a first grating unit in a first curved surface area and a second curved surface area according to an embodiment of the present invention;

7 is a schematic diagram of a grating period of a first grating unit corresponding to sub-pixels of different colors in the same pixel according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a grating layer provided by an embodiment of the present invention;

9 is a simulation schematic diagram of the brightness of the curved display area under different viewing angles when the grating layer is not provided according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a simulation of the brightness of light emitted from the rear surface display area of the grating layer under different viewing angles according to an embodiment of the present invention;

FIG. 11 is another schematic structural diagram of a grating layer provided by an embodiment of the present invention;

12 is a schematic diagram of refraction of light in microstructures with different heights provided by an embodiment of the present invention;

13 is a schematic diagram of a first cross-section of a microstructure provided by an embodiment of the present invention;

FIG. 14 is another schematic diagram of the first cross section in the microstructure provided by the embodiment of the present invention;

Fig. 15 is another schematic diagram of the first cross section in the microstructure provided by the embodiment of the present invention;

FIG. 16 is another schematic diagram of the first cross section in the microstructure provided by the embodiment of the present invention;

FIG. 17 is another schematic structural diagram of a microstructure provided by an embodiment of the present invention;

FIG. 18 is a schematic diagram when a functional layer provided by an embodiment of the present invention is multiplexed into a grating layer;

FIG. 19 is a schematic diagram when the adhesive layer provided by the embodiment of the present invention is multiplexed into a grating layer;

20 is a schematic diagram of a cover plate provided in an embodiment of the present invention when it is multiplexed into a grating layer;

21 is a schematic diagram of a protective film provided in an embodiment of the present invention when it is multiplexed into a grating layer;

22 is another schematic diagram when the protective film provided in the embodiment of the present invention is multiplexed into a grating layer;

23 is another schematic diagram when the functional layer is multiplexed into a grating layer provided by an embodiment of the present invention;

FIG. 24 is another schematic diagram when the functional layer is multiplexed into a grating layer provided by an embodiment of the present invention;

25 is a schematic diagram of a grating layer provided between an encapsulation layer and an adhesive layer according to an embodiment of the present invention;

26 is a schematic diagram of a grating layer provided between an adhesive layer and a cover plate according to an embodiment of the present invention;

FIG. 27 is another schematic diagram when the grating layer is located between the adhesive layer and the cover plate according to an embodiment of the present invention;

FIG. 28 is another schematic diagram when the grating layer is located in the encapsulation layer and the adhesive layer according to the embodiment of the present invention;

FIG. 29 is another schematic diagram when the grating layer is located in the encapsulation layer and the adhesive layer according to the embodiment of the present invention;

FIG. 30 is another schematic structural diagram of a grating layer provided by an embodiment of the present invention;

FIG. 31 is a schematic structural diagram of a curved display device according to an embodiment of the present invention.

FIG. 32 is a cross-sectional view of FIG. 31 along the direction B1-B2;

33 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention;

34 is a flowchart of a manufacturing method provided by an embodiment of the present invention;

35 is a schematic diagram of a manufacturing process of a cover plate when the cover plate is multiplexed into a grating layer according to an embodiment of the present invention;

36 is a schematic diagram of another manufacturing process of the cover plate when the cover plate provided in the embodiment of the present invention is multiplexed into a grating layer;

FIG. 37 is a flow chart of a manufacturing process of a grating layer provided by an embodiment of the present invention;

Fig. 38 is the structure flow chart corresponding to Fig. 37;

FIG. 39 is a flowchart of another structure corresponding to FIG. 37 .

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

Before elaborating the technical solution of the present invention, the present invention specifically describes the problems existing in the prior art:

In the prior art, in order to improve the color shift phenomenon in the curved display area of the curved display panel, the arrangement of the light-emitting layer in the curved display area is usually adjusted. FIG. 2 is another structural schematic diagram of the curved display panel in the prior art, As shown in FIG. 2, the curved display panel includes a flat display area 1" and a curved display area 2". In the curved display area 2", the light-emitting layer 3" in the organic light emitting diode is inclined relative to the base substrate 4". It is understood that most of the light emitted by the light-emitting layer 3" is emitted in a direction perpendicular to its light-emitting surface 5", and a small part of the light is scattered in other directions. After the light-emitting layer 3" is inclined relative to the base substrate 4" , the light-emitting surface 5" of the light-emitting layer 3" is also inclined relative to the base substrate 4", then the transmission direction of most of the light emitted by the light-emitting layer 3" along the direction perpendicular to its light-emitting surface 5" is also It will be inclined along the direction PP'' towards the front viewing angle, thereby improving the light output brightness of the curved display area 2'' at the front viewing angle.

However, with this kind of structure, special design of the evaporation process of other film layers between the light-emitting layer 3" and the base substrate 4" is required, so that the light-emitting layer 3" can be inclined relative to the base substrate 4". As a result, the manufacturing cost of the curved display panel is high and the process is difficult. Moreover, for different curved display panels, the degree of curvature of the curved display area 2" is different. If the above setting method is adopted, each curved display panel needs to customize the degree of inclination of the light emitting layer 3". , which is not conducive to the realization of mass production.

Based on this, an embodiment of the present invention provides a curved display panel. FIG. 3 is a schematic structural diagram of the curved display panel provided by an embodiment of the present invention, and FIG. 4 is a cross-sectional view of FIG. 4, the curved display panel includes: a display area 1, and the display area 1 includes a flat display area 2 and a curved display area 3, wherein, the flat display area 2 refers to the uncurved area in the display area 1, and the curved display area 3 It refers to the curved area in the display area 1, and the curved display area 3 can be a curved display area. It should be noted that, with reference to Figure 4, when the user is watching or operating the display, the user's viewing angle direction is usually perpendicular to the flat display area. The plane where 2 is located, in the embodiment of the present invention, the viewing angle direction perpendicular to the plane where the plane display area 2 is located is defined as the front viewing angle direction PP, and the viewing angle direction that has a certain angle with the front viewing angle direction PP is defined as the oblique viewing angle direction OP ; base substrate 4, the base substrate 4 is provided with an array layer 5 on the side of the light-emitting direction of the curved display panel, a plurality of pixels 6 are arranged in the array layer 5, and each pixel 6 includes a plurality of sub-pixels 7; the grating layer 8, The grating layer 8 is located on the side of the array layer 5 facing away from the base substrate 4 , and the grating layer 8 includes a grating structure 9 located in the curved display area 3 .

FIG. 5 is a schematic structural diagram of a first grating unit provided by an embodiment of the present invention. As shown in FIG. 5 , the grating structure includes a plurality of first grating units 91 , and one first grating unit covers one sub-pixel 71 of the first color, The sub-pixels 71 of the first color refer to sub-pixels used to generate light signals of the first color, and the first color is any one of the colors of the light signals generated by the plurality of sub-pixels 7 in the array layer 5 , for example , when the plurality of sub-pixels 7 include red sub-pixels, green sub-pixels and blue sub-pixels, the above-mentioned first color may be red, green or blue, and the first color light signal generated by the sub-pixels 71 of the first color passes through the first color. A grating unit is emitted. In FIG. 5 , the sub-pixels 7 filled with the same color can be regarded as sub-pixels of the same color.

5, FIG. 6 is a schematic diagram of the grating period of the first grating unit in the first curved surface area and the second curved surface area provided by an embodiment of the present invention. As shown in FIG. 6, the curved surface display area 3 includes a first curved surface. area 10 and the second curved area 11, the curvature of the first curved area 10 is smaller than the curved curvature of the second curved area 11, the grating period P1 of the first grating unit 91 located in the first curved area 10 is greater than, located in the second curved area The grating period P2 of the first grating unit 91 in the curved area 11 .

It should be noted that the above-mentioned first curved area 10 and second curved area 11 do not refer to specific limitations on two areas. In any two areas in the curved display area 3, as long as the curvature of one of the areas is satisfied If the curvature is greater than that of the other region, the region with smaller curvature is regarded as the first curved region 10 , and the region with larger curvature is regarded as the second curved region 11 .

In addition, it should also be noted that when the sub-pixel 7 includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, in the first grating unit 91 overlapping with the red sub-pixel, the first grating unit 91 located in the first curved area 10 The grating period of a grating unit 91 is greater than the grating period of the first grating unit 91 located in the second curved area 11; in the first grating unit 91 overlapping with the green sub-pixel, the first grating unit located in the first curved area 10 The grating period of 91 is greater than the grating period of the first grating unit 91 located in the second curved area 11; in the first grating unit 91 overlapping with the blue sub-pixel, the first grating unit 91 located in the first curved area 10 has a The grating period is greater than the grating period of the first grating unit 91 located in the second curved area 11 . The grating period change of the grating structure 9 shown in FIG. 6 can be understood as the change of the grating period of the first grating unit 91 corresponding to the red sub-pixel, or the grating period of the first grating unit 91 corresponding to the green sub-pixel can also be understood The change of , or, can also be understood as the change of the grating period of the first grating unit 91 corresponding to the blue sub-pixel.

In addition, it should be noted that, referring to FIG. 4 again, each sub-pixel 7 includes a pixel driving circuit 12 and an organic light emitting diode 13 that are electrically connected. The pixel driving circuit 12 includes a thin film transistor 14, and the pixel driving circuit 12 is used for providing a driving current to the organic light emitting diode 13 to drive the organic light emitting diode 13 to emit light. Further, the thin film transistor 14 includes an active layer 15 , a gate layer 16 and a source and drain layer 17 which are sequentially arranged along the light emitting direction of the curved display panel. The organic light emitting diode 13 includes an anode layer 18 , a light emitting layer 19 and a cathode layer 20 arranged in sequence along the light emitting direction of the curved display panel. The light emitted by the sub-pixel 7 in the embodiment of the present invention refers to the light emitted by the light-emitting layer 19 in the sub-pixel 7 . The active layer 15 , the gate layer 16 , the source and drain layers 17 , the anode layer 18 , the light-emitting layer 19 , the cathode layer 20 and the insulating layer between any two of the six film layers constitute the above-mentioned array layer. 5. In addition, it should be noted that the pixel driving circuit 12 shown in FIG. 4 only includes one thin film transistor 14 , which is only for schematic illustration. In practical applications, the pixel driving circuit 12 may include multiple thin film transistors 14 .

其中，α为入射至光栅结构9的入射光的入射角，β为衍射后的衍射光的衍射角，n1为入射光所处介质的折射率，n2为衍射光所处介质的折射率，λ为入射至光栅结构9的入射光的波长，P为光栅周期，m为衍射级数，m＝0、±1、±2、…，并且，m为负值时，衍射光偏离法线一侧，sinβ为正值，m为正值时，衍射光偏离法线另一侧，sinβ为负值，可知，同一级衍射中衍射角β与光栅周期P呈反比，光栅周期P越小，某个非0级衍射的衍射角β越大，因此，在覆盖第一颜色的子像素71的第一光栅单元91中，通过使第二曲面区11中第一光栅单元91的光栅周期P2小于第一曲面区10中第一光栅单元91的光栅周期P1，可以使第一曲面区10中的衍射光具有较小的衍射角β1，而第二曲面区11中的衍射光具有较大的衍射角β2，从而实现对第一曲面区10和第二曲面区11中衍射光的衍射角进行不同程度的调整，使得第一曲面区10和第二曲面区11中的衍射光均趋近于正视角方向PP射出。In the curved display panel provided by the embodiment of the present invention, in the curved display area 3, by arranging the grating layer 8, when the light emitted by the sub-pixels 7 in the curved display area 3 is incident on the grating layer 8, it will be in the grating structure 9. Diffraction occurs, and the propagation direction of the diffracted light changes, so that part of the light tends to be emitted in the positive viewing angle direction PP. Further, please refer to FIG. 6 again, in the first curved surface area 10 with a small degree of curvature, for the light emitted by the sub-pixels 7 in this area, the diffracted diffracted light DL1 only needs to deviate from the normal line N1 by a small angle, that is, It can be emitted close to the frontal viewing angle direction PP, that is to say, in this area, if you want to improve the brightness of the light at the frontal viewing angle, you only need to control the diffracted light to have a smaller diffraction angle β1; In the curved area 11, for the light emitted by the sub-pixels 7 in this area, the diffracted diffracted light DL2 needs to deviate from the normal N2 to be emitted close to the front view direction PP. That is to say, in this area, if you want to improve the For the brightness of the light emitted under the frontal viewing angle, it is necessary to control the diffracted light to have a larger diffraction angle β2. And according to the grating formula

Among them, α is the incident angle of the incident light incident on the grating structure 9, β is the diffraction angle of the diffracted light after diffraction, n1 is the refractive index of the medium where the incident light is located, n2 is the refractive index of the medium where the diffracted light is located, λ is the wavelength of the incident light incident on the grating structure 9, P is the grating period, m is the diffraction order, m=0, ±1, ±2, ..., and when m is a negative value, the diffracted light deviates from the normal side , sinβ is a positive value, when m is a positive value, the diffracted light deviates from the other side of the normal, and sinβ is a negative value, it can be seen that the diffraction angle β in the same order of diffraction is inversely proportional to the grating period P, the smaller the grating period P, the greater the The larger the diffraction angle β of non-0th-order diffraction is, therefore, in the first grating unit 91 covering the sub-pixels 71 of the first color, by making the grating period P2 of the first grating unit 91 in the second curved area 11 smaller than the first grating period P2 The grating period P1 of the first grating unit 91 in the curved area 10 can make the diffracted light in the first curved area 10 have a smaller diffraction angle β1, while the diffracted light in the second curved area 11 has a larger diffraction angle β2 , so that the diffraction angles of the diffracted light in the first curved area 10 and the second curved area 11 can be adjusted to different degrees, so that the diffracted light in the first curved area 10 and the second curved area 11 are both close to the front viewing angle direction. PP injection.

It can be seen that, using the curved display panel provided by the embodiment of the present invention, in the first grating unit 91 covering the sub-pixels 71 of the first color, the grating period P2 of the first grating unit 91 in the second curved area 11 is smaller than that of the first grating unit 91 in the second curved area 11. The grating period P2 of the first grating unit 91 in the curved area 10 can adjust the diffraction angles of diffracted light in areas with different degrees of curvature to different degrees, so that the diffracted light in each area of the curved display area 3 tends to The PP is emitted in the front viewing angle direction, which effectively improves the consistency of the brightness of the light in different areas of the curved display area 3 under the front viewing angle, thereby improving the brightness consistency of the curved display area 3 and the flat display area 2 under the front viewing angle, and significantly improves the curved surface. Color cast in display area 3 to optimize display performance.

In addition, it should be noted that, according to the grating diffraction principle, after the mixed light with different wavelengths is diffracted by the grating structure 9, the spectrum of m-order diffraction will be obtained, m=0, ±1, ±2, ..., in the same order In diffraction, the light of different wavelengths in the mixed light will be dispersed after diffraction, and the dispersed light will be arranged in the order of wavelength to form a series of discrete spectral lines. In the m-order diffraction, the intensity of the 0-order diffraction is the strongest, and with the increase of |m|, the intensity of the m-order diffraction gradually decreases. In the embodiment of the present invention, the grating period can be adjusted to adjust the diffraction angle corresponding to the non-zero-order diffraction, so that the first-order diffracted light with greater intensity is emitted toward the positive viewing angle direction PP, and to a greater extent The brightness of the light emitted by the curved display area 3 under the normal viewing angle is compensated in a grounded manner.

Exemplarily, assuming that the second curved area 11 is bent by 90° compared to the plane area 2, the refractive index n1 of the medium where the incident light is located and the refractive index n2 of the medium where the diffracted light is located are both 1.5, for the green sub-pixel For the green light with a central wavelength of 550nm, take the light emitted parallel to the normal direction, that is, the incident angle α is 0 as an example, if you want to adjust the diffraction angle β of the first-order diffracted light of this part of the light to 45 °, according to the grating formula, the grating period P can be obtained as 519nm. Since the wavelength of green light ranges from 500nm to 600nm, considering the change of the wavelength of green light, the value of the grating period can also be fluctuated by 50nm on the basis of the grating period of 519nm corresponding to the green light of 550nm to make it different from The wavelengths of the green light are matched. In this case, the grating period of the first grating unit 91 corresponding to the green sub-pixel can be adjusted within the range of 569 nm to 469 nm.

In one embodiment, please refer to FIGS. 5 and 6 again, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, (as indicated by the dotted arrows in FIGS. 5 and 6 , direction), the curved curvature of the curved display area 3 increases, and the grating period of the plurality of first grating units 91 in the grating structure 9 decreases, wherein the inner edge 211 of the curved display area 3 is close to the flat display area 2, and the curved The outer edge 212 of the display area 3 is away from the flat display area 2 .

For example, in the first grating unit 91 corresponding to the red sub-pixel, the grating period of this part of the first grating unit 91 decreases along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, and the grating period corresponding to the green sub-pixel decreases. In the first grating unit 91, the grating period of this part of the first grating unit 91 decreases along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, and in the first grating unit 91 corresponding to the blue sub-pixel , the grating period of this part of the first grating unit 91 decreases along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3 .

It should be noted that, in the embodiment of the present invention, the inner edge 211 of the curved display area 3 is limited only to clearly illustrate the increasing direction of the curvature of the curved display area 3. In the actual product structure, the flat display area 2 It is communicated with the curved display area 3 , and there is no solid structure of the inner edge 211 of the curved display area 3 .

Based on the above analysis, it can be seen that the closer to the outer edge 212 of the curved display area 3, the greater the degree of curvature of the curved display area 3. In this area, the first grating unit 91 needs to have a smaller grating period, so that the diffracted light It has a larger diffraction angle β, so that the diffracted light tends to be emitted in the positive viewing angle direction PP. Therefore, in the direction along the inner edge 211 of the curved display area 3 toward the outer edge 212, by decreasing the grating period of the first grating unit 91 covering the sub-pixel 71 of the first color, the diffracted light in this direction can be reduced. The diffraction angle changes incrementally, so that the diffracted light in each area of the curved display area 3 tends to be emitted in the front viewing angle direction PP, thereby effectively improving the color shift in each area of the curved display area 3 .

Further, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, the grating periods of the plurality of first grating units 91 in the grating structure 9 decrease linearly, so that the grating periods are regular Gradual gradient, and then regularly adjust the diffraction angle of the diffracted light.

In one embodiment, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3 , the diffraction efficiency of the plurality of first grating units 91 in the grating structure 9 increases. For example, in the first grating unit 91 corresponding to the red sub-pixel, the diffraction efficiency of this part of the first grating unit 91 increases along the direction from the inner edge 211 to the outer edge 212 of the curved display area 3, and in the direction corresponding to the green sub-pixel In the first grating unit 91, the diffraction efficiency of this part of the first grating unit 91 increases along the direction from the inner edge 211 to the outer edge 212 of the curved display area 3. In the first grating unit 91 corresponding to the blue sub-pixel, this The diffraction efficiency of some of the first grating units 91 increases along the direction from the inner edge 211 to the outer edge 212 of the curved display area 3 . Specifically, the diffraction efficiency of the first grating unit 91 can be adjusted by adjusting the duty ratio and height of the first grating unit 91 and the refractive index difference between the first grating unit 91 and the external medium.

Based on the above analysis, it can be seen that the greater the curvature of the curved display area 3, the greater the deviation between the propagation direction of the light emitted by the sub-pixel 7 and the front viewing angle direction PP, and the diffracted light is more difficult to adjust to the front viewing angle direction PP. The amount of diffracted light emitted from the PP in the frontal viewing angle direction is relatively small, and the brightness of the light emitted under the frontal viewing angle is correspondingly low. Therefore, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, by increasing the diffraction efficiency of the plurality of first grating units 91 in the grating structure 9, the degree of curvature can be increased to a greater extent This increases the amount of diffracted light emitted from PP in the frontal viewing angle direction, thereby increasing the light-emitting brightness of this part of the area under the frontal viewing angle, and improving the different areas of the curved display area 3 under the frontal viewing angle. Consistency of luminous brightness.

It should be noted that, in the embodiment of the present invention, the diffraction efficiency of the first-order diffraction with greater intensity can be adjusted, so that the first-order diffracted light with greater intensity is emitted more toward the frontal viewing angle direction PP, so that the The brightness of the light emitted by the curved display area 3 under the front viewing angle is compensated to a greater extent.

In one embodiment, FIG. 7 is a schematic diagram of the grating period of the first grating unit corresponding to sub-pixels of different colors in the same pixel according to an embodiment of the present invention. As shown in FIG. 7 , each pixel 6 includes a red sub-pixel 22 , green sub-pixel 23 and blue sub-pixel 24; the grating structure 9 includes a red grating unit 25, a green grating unit 26 and a blue grating unit 27, wherein the red grating unit 25 covers the red sub-pixel 22, and the red sub-pixel 22 generates The red light signal is emitted through the red grating unit 25, the green grating unit 26 covers the green sub-pixel 23, the green light signal generated by the green sub-pixel 23 is emitted through the green grating unit 26, the blue grating unit 27 covers the blue sub-pixel 24, and the blue The blue light signal generated by the sub-pixel 24 is emitted through the blue grating unit 27 . For the same pixel 6, the grating period of the red grating element 25 covering the red sub-pixel 22 is Pr, the grating period of the green grating element 26 covering the green sub-pixel 23 is Pg, and the grating period of the blue grating element 27 covering the blue sub-pixel 24 is Pg. The grating period is Pb, and Pr, Pg, and Pb satisfy: Pr>Pg>Pb.

It can be understood that the red sub-pixels 22, green sub-pixels 23 and blue sub-pixels 24 in the same pixel 6 are located close to each other. Therefore, this part of the red sub-pixels 22, green sub-pixels 23 and blue sub-pixels 24 are in the same position. The degree of curvature of the area located in the curved display area 3 can be regarded as the same. However, due to the different wavelengths of red light, green light and blue light, the wavelength of red light is the largest, and the wavelength of blue light is the smallest. According to the grating formula, under the same incident angle α, by making Pr, Pg and Pb satisfy: Pr >Pg>Pb, can make the diffraction angles of red light, green light and blue light in the same pixel 6 tend to be the same, then, after the light of different colors emitted by the same pixel 6 is diffracted, it can tend to be transmitted in the same direction, thereby ensuring the pixel 6. 6 The accuracy of the colors presented, further improving the color cast.

In one embodiment, FIG. 8 is a schematic structural diagram of a grating layer provided by an embodiment of the present invention. As shown in FIG. 8 , the grating structure 9 includes a plurality of microstructures 28 and a plurality of slits 29 , and the plurality of microstructures 28 They are arranged at intervals in the curved display area 3, and the slits 29 are located between two adjacent microstructures 28. The incident light incident on the grating structure 9 is diffracted in the slits 29. At the same time, the microstructures 28 are also used to The light emitted by the sub-pixels 7 is refracted and/or scattered. At this time, the width of the slit 29 is in the order of several tens of micrometers, and the microstructure 28 can be a light-transmitting prism structure.

Under this kind of structure, the grating structure 9 can not only use the slit 29 to achieve diffraction, but also can further use the microstructure 28 to refract and/or scatter the partial light when a part of the light is incident on the microstructure 28, so as to realize the The propagation direction of part of the light is adjusted so that it tends to be transmitted in the front viewing angle direction PP, so as to improve the brightness of the light emitted by the curved display area 3 under the front viewing angle to a greater extent.

To this end, the applicant has also carried out simulation tests on the light emission brightness of the curved display area 3 when the grating layer 8 is not provided in the curved display panel, and the light output brightness of the curved display area 3 when the grating layer 8 is provided in the curved display panel. Under the condition that the area 3 is bent by 90° compared to the flat display area 2, FIG. 9 is a simulation schematic diagram of the brightness of the curved display area under different viewing angles when the grating layer is not provided according to the embodiment of the present invention, as shown in FIG. 9 , if the grating layer 8 is not used to diffract, refract and/or scatter the light, as shown in the actual simulation curve in the figure, the curved display area 3 reaches the maximum light intensity at the oblique viewing angle of about +60°, while at the front viewing angle ( The light intensity at a viewing angle of 0°) is almost zero. FIG. 10 is a schematic diagram of the simulation of the brightness of the light emitted from the rear surface display area of the grating layer provided by the embodiment of the present invention under different viewing angles. As shown in FIG. 10 , after the grating layer 8 is used to diffract, refract and/or scatter the light, as shown in FIG. As shown in the actual simulation curve in the figure, the light intensity of the curved display area 3 is weakened at the oblique viewing angle, while the light intensity at the front viewing angle (viewing angle of 0°) is increased to about 35% of the peak intensity. It can be seen that the use of the grating layer provided by the embodiment of the present invention can effectively improve the light output brightness of the curved display area 3 under the front viewing angle, and improve the color shift phenomenon of the curved display area 3 .

It should be noted that when the applicant conducts the above simulation test, the test is based on the curved display panel with the structure shown in FIG. 3 . In the structure of the curved display panel shown in FIG. 3 , the curved display panel has a long axis. K1 and the short axis K2, the curved display panel is provided with a curved display area 3 on both sides in the direction of the short axis K2, and the curved display panel is not provided with a curved display area 3 on both sides in the direction of the long axis K1. The actual simulation curves shown in Figures 9 and 10 represent the brightness distribution of the curved display panel at different viewing angles in the direction of the short axis K2, and the reference curves shown in Figures 9 and 10 represent the curved display panel on the long axis K1. The brightness distribution under different viewing angles in the direction, since the curved display panel is not provided with the curved display area 3 on both sides in the direction of the long axis K1, there is no brightness distribution of the curved display area 3 under different viewing angles. Therefore, the above analysis is It is based on the actual simulation curve.

In addition, it should be noted that the structure of the curved display panel shown in FIG. 3 is only a schematic illustration. In other optional embodiments of the present invention, the curved display panel is located on both sides in the direction of the short axis K2 and on the long side. A curved display area 3 may be provided on both sides in the direction of the axis K1, respectively.

In one embodiment, please refer to FIG. 8 again, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3 (the direction indicated by the dashed arrow in FIG. 8 ), the curved display area 3 The bending curvature of the grating structure 9 increases, the degree of light scattering and/or light refraction of the plurality of microstructures 28 in the grating structure 9 increases, wherein the inner edge 211 of the curved display area 3 is close to the flat display area 2, and the outer edge of the curved display area 3 212 is away from the flat display area 2 .

Based on the above analysis, it can be seen that the greater the curvature of the curved display area 3, the more serious the color shift phenomenon. Therefore, in the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the degree of light scattering of the microstructure 28 is increased. And/or the degree of light refraction increases, a greater number of light rays will be refracted and/or scattered in the area with a greater degree of curvature, so that a greater number of refracted lights can tend to be emitted in the positive viewing angle direction PP. The brightness of the light emitted under the frontal viewing angle of the region is improved to different degrees, which further improves the uniformity of the brightness of the light emitted from the curved display area 3 and the flat display area 2 under the frontal viewing angle.

Further, the adjustment of the light scattering degree and/or the light refraction degree of the microstructure 28 can be realized by adjusting the height of the microstructure 28. FIG. 11 is another structural schematic diagram of the grating layer provided by the embodiment of the present invention, as shown in FIG. 11 . As shown, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, the heights h of the plurality of microstructures 28 in the respective directions perpendicular to the tangential plane of the base substrate 4 increase, wherein the above The cut plane of the base substrate 4 refers to the cut plane at the position corresponding to the center point of the microstructure 28 in the base substrate 4, wherein the height of the microstructure 28 can be changed in the range of 5 μm to 20 μm, so as to ensure a good refraction effect. On the premise, it is avoided that the thickness of the grating layer 8 is too large, so as to avoid adverse effects on the overall module thickness of the curved display panel.

Taking refraction as an example, FIG. 12 is a schematic diagram of the refraction of light in microstructures with different heights provided by an embodiment of the present invention. As shown in FIG. 12 , the height of the microstructure 28 determines the clip between the side surface and the bottom surface of the microstructure 28 . Angle θ, where the bottom surface of the microstructure 28 refers to the surface of the microstructure 28 on the side close to the base substrate 4, and the side surface of the microstructure 28 refers to the surface intersecting with the bottom surface. The greater the height of the microstructure 28, the value of θ also bigger. When the light is incident on the microstructure 28 in a certain direction, the larger the θ, the smaller the angle between the normal viewing direction PP and the normal, that is, 90-θ, when the refraction angle of the refracted light is δ, and at When 90-θ+δ approaches 0°, the angle between the refracted light and the positive viewing angle direction PP tends to 0, and the refracted light tends to be emitted in the positive viewing angle direction PP. Since the color shift phenomenon is more serious in the area with a larger degree of curvature, this area needs to be compensated to a greater extent for the brightness of the light emitted under the front viewing angle. In the embodiment of the present invention, by increasing the height of the microstructure 28 in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the larger the curvature of the area, the larger the θ of the microstructure 28, Further, the smaller 90-θ is, so that the refraction angle δ corresponding to more refracted light can satisfy 90-θ+δ approaching 0°, so that more refracted light can be emitted toward the positive viewing angle direction PP. , to compensate the brightness of the light at the front viewing angle to a greater extent. Specifically, taking the microstructure 28 located in the curved display area 3 in an area that is bent by 90° compared to the flat display area 2 as an example, please refer to FIG. 12 again, in the microstructure 28 with a smaller height, since θ1 is smaller , therefore, 90-θ1 is larger, then only the refracted light with a smaller refraction angle δ1 can satisfy 90-θ1+δ1 approaching 0°, so only a small amount of refracted light can be emitted toward the positive viewing angle direction PP; and In the microstructure 28 with a larger height, since θ2 is larger, 90-θ2 is smaller. At this time, a slightly larger refraction angle δ2 can satisfy that 90-θ2+δ2 approaches 0°, thus making more The refracted light can tend to be emitted in the positive viewing angle direction PP, which greatly increases the brightness of the light in this area under the positive viewing angle.

In addition, it should be noted that according to the refraction formula n1sinμ=n2sinδ, where n1 is the refractive index of the medium where the incident light is located, and n2 is the refractive index of the medium where the refracted light is located. It can be known that the incident angle can also be determined by adjusting n1 and n2. The incident light has a smaller refraction angle δ, which makes 90-θ+δ tend to 0° more easily.

In one embodiment, referring to FIGS. 13 to 16 , the microstructure 28 has a first cross-section 30 , and the first cross-section 30 is parallel to the cut plane of the base substrate 4 , wherein the cut plane of the base substrate 4 refers to the base substrate For the cut plane at the position corresponding to the center point of the microstructure 28 in 4, the shape of the first section 30 is a rectangle, a triangle, an ellipse, a circle or a diamond. At this time, the microstructures 28 may be distributed in a point shape. Of course, in other embodiments of the present invention, the first cross-section 30 may also have other irregular shapes.

It should be noted that, in the curved display area 3, the first sections 30 of different microstructures 28 may have the same shape. For example, referring to FIG. 8, FIG. 13 is the first section of the microstructure provided in the embodiment of the present invention. Schematic diagram, as shown in FIG. 13 , the first cross-sections 30 of the microstructures 28 in the curved display area 3 are all triangles, and at this time, the microstructures 28 are all pyramidal structures, or, in conjunction with FIG. 4 , FIG. 14 is an embodiment of the present invention Another schematic diagram of the first section in the provided microstructure, as shown in FIG. 14 , the first section 30 of the microstructure 28 in the curved display area 3 are all circular, and at this time, the microstructures 28 are all cylindrical structures 15 is another schematic diagram of the first cross section of the microstructure provided by the embodiment of the present invention. As shown in FIG. 15 , the first cross section 30 of the microstructure 28 in the curved display area 3 is all diamond-shaped. Alternatively, in the curved display area 3, the first sections 30 of different microstructures 28 may also have the same shape. For example, FIG. 16 is another schematic diagram of the first section in the microstructure provided by the embodiment of the present invention, As shown in FIG. 16 , the shape of the first section 30 of some of the microstructures 28 in the curved display area 3 is a triangle, the shape of the first section 30 of some of the microstructures 28 is a circle, and the shape of the first section of the other part of the microstructure 28 is a circle. 30 is in the shape of a rhombus. By adopting the above arrangement, the flexibility of setting the shape of the microstructure 28 can be improved, and setting the first section 30 of the microstructure 28 to the above-mentioned conventional shape can also reduce the structural complexity of the microstructure 28 and simplify the process difficulty.

Alternatively, FIG. 17 is another schematic structural diagram of the microstructure provided by the embodiment of the present invention. As shown in FIG. 17 , the microstructure 28 is a strip-shaped structure. direction, and a single microstructure 28 extends along the second direction, the first direction is the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, and the inner edge 211 of the curved display area 3 is close to the plane In the display area 2, the outer edge 212 of the curved display area 3 is far away from the flat display area 2, and the second direction intersects with the first direction. At this time, the slits 29 formed between the microstructures 28 are strip-shaped slits, so that the grating Structure 9 has better diffractive properties.

In one embodiment, referring to FIGS. 18 to 21 , the curved display panel further includes an encapsulation layer 31 , a functional layer 32 , an adhesive layer 33 , a cover plate 34 and a protective film 35 . The encapsulation layer 31 is used to encapsulate the array layer 5 to encapsulate the array layer 5 to prevent external water and oxygen from infiltrating into the array layer 5 . The functional layer 32 is located on the side of the encapsulation layer 31 facing away from the base substrate 4 , and is used to implement functions such as touch control and polarization. The adhesive layer 33 is located on the side of the functional layer 32 facing away from the base substrate 4 , and can be specifically formed of a transparent optical adhesive material. The cover plate 34 is located on the side of the adhesive layer 33 facing away from the base substrate 4 , and can be made of glass material, and is bonded and fixed to the functional layer 32 through the adhesive layer 33 . The protective film 35 is located on the side of the cover plate 34 facing away from the base substrate 4 , and can be formed of a polyester resin material to cover the cover plate 34 and protect the display module.

Based on the above structure, FIG. 18 is a schematic diagram when the functional layer is multiplexed into a grating layer provided by an embodiment of the present invention. As shown in FIG. 18 , the functional layer 32 includes a grating structure 9 , and at this time, the functional layer 32 is multiplexed into a grating layer. 8. The functional layer 32 has functions such as touch control, polarizing light, and diffracting light. FIG. 19 is a schematic diagram of an embodiment of the present invention when the adhesive layer is multiplexed into a grating layer. As shown in FIG. 19 , the adhesive layer 33 includes a grating structure 9 . At this time, the adhesive layer 33 is multiplexed into a grating layer 8 . 33 has both the functions of adhesion and diffraction of light. FIG. 20 is a schematic diagram of a cover plate provided by an embodiment of the present invention when it is multiplexed into a grating layer. As shown in FIG. 20 , the cover plate 34 includes a grating structure 9 . At this time, the cover plate 34 is multiplexed into a grating layer 8 , and the cover plate 34 also has the function of diffracting light. 21 is a schematic diagram of the protective film provided in the embodiment of the present invention when it is multiplexed into a grating layer. As shown in FIG. 21 , the protective film 35 includes a grating structure 9 . 35 has the function of protecting and diffracting light. With the above arrangement, the grating layer 8 can be formed by multiplexing the original film layers in the curved display panel, and there is no need to add an additional film layer, so that the grating layer 8 does not need to occupy additional film layer space, which is more beneficial to the curved display panel. Thin and light design.

In addition, it should be noted that when the grating layer 8 is multiplexed with the above-mentioned film layers, the microstructure 28 may be located on the side of the film layer facing the base substrate 4, or may be located in the film layer facing away from the base substrate 4. side. For example, referring to FIG. 21 again, when the protective film 35 is multiplexed into the grating layer 8, the microstructure 28 may be located on the side of the protective film 35 facing away from the base substrate 4, or, FIG. 22 is provided by an embodiment of the present invention Another schematic diagram when the protective film is reused as a grating layer, as shown in FIG. 22 , the microstructure 28 can also be located on the side of the protective film 35 facing the base substrate 4 . In addition, it should be noted that when the protective film 35 is multiplexed into the grating layer 8, the multiplexing of the grating layer 8 and the protective film 35 can be realized by forming the microstructures 28 and the slits 29 on the polyester resin substrate. , so that the film has both protective and optical effects.

Further, FIG. 23 is another schematic diagram when the functional layer provided by the embodiment of the present invention is multiplexed into a grating layer. As shown in FIG. 23 , the functional layer 32 includes a touch layer 36 and a polarizer 37 . The layer 36 is disposed on the side of the encapsulation layer 31 that faces away from the base substrate 4 , the touch layer 36 includes a touch electrode layer 38 and an insulating layer 39 , and the insulating layer 39 is located on the side of the touch electrode layer 38 that faces away from the base substrate 4 . The polarizer 37 is arranged on the side of the insulating layer 39 facing away from the base substrate 4 ;

It should be noted that, in the manufacturing process of the curved display panel, the plurality of film layers included in the array layer 5 can be formed by semiconductor processes such as coating and photolithography. Please refer to FIG. 23 again. The encapsulation layer 31 includes a plurality of overlapping layers. The organic encapsulation layer 61 and the inorganic encapsulation layer 62 are provided. The organic encapsulation layer 61 and the inorganic encapsulation layer 62 can be formed by semiconductor processes such as chemical vapor deposition and inkjet printing. The buffer layer 63 , the first electrode layer 64 , the electrode insulating layer 65 and the second electrode layer 66 arranged in sequence can also be formed by using semiconductor processes such as coating and photolithography. Therefore, in the manufacturing process of the curved display panel, the array layer 5 , the encapsulation layer 31 and the touch layer 36 can be continuously formed in a single production line using a semiconductor process, and then the polarizer 37 , the adhesive layer 33 , and the cover plate 34 Structures such as the protective film 35 are placed on the side of the touch layer 36 facing away from the array layer 5 .

Therefore, in the embodiment of the present invention, when the functional layer 32 is multiplexed into the grating layer 8, by multiplexing the grating layer 8 and the insulating layer 39 in the touch layer 36, the array layer 5, the encapsulation layer 31 and the touch layer can be reused. After the process flow of the control layer 36 is completed, the microstructure 28 and the slit 29 are formed on the insulating layer 39 by a semiconductor process such as photolithography. If there is a process flow for adjustment, it is only necessary to add a photolithography process in the last process of forming the insulating layer 39, and the process complexity is low and it is easier to implement.

In addition, it should be noted that the thickness of the insulating layer 39 is usually in the range of 1-10 μm. When the insulating layer 39 is etched by the photolithography process, please refer to FIG. 23 again. The insulating layer 39 is partially etched, for example, only the slit 29 is etched to a thickness of 5 μm. Alternatively, FIG. 24 is another schematic diagram when the functional layer provided in the embodiment of the present invention is multiplexed into a grating layer, as shown in FIG. 24 . As shown, the insulating layer 39 in the region where the slit 29 is located can also be completely etched away.

In one embodiment, referring to FIGS. 25 and 26 , the curved display panel further includes an encapsulation layer 31 , a functional layer 32 , an adhesive layer 33 , a cover plate 34 and a protective film 35 . The encapsulation layer 31 is used to encapsulate the array layer 5 to encapsulate the array layer 5 to prevent external water and oxygen from infiltrating into the array layer 5 . The functional layer 32 is located on the side of the encapsulation layer 31 facing away from the base substrate 4 , and is used to implement functions such as touch control and polarization. The adhesive layer 33 is located on the side of the functional layer 32 facing away from the base substrate 4 , and can be specifically formed of a transparent optical adhesive material. The cover plate 34 is located on the side of the adhesive layer 33 facing away from the base substrate 4 , and can be made of glass material, and is bonded and fixed to the functional layer 32 through the adhesive layer 33 . The protective film 35 is located on the side of the cover plate 34 facing away from the base substrate 4 , and can be formed of a polyester resin material to cover the cover plate 34 and protect the display module.

Based on the above structure, FIG. 25 is a schematic diagram of the grating layer provided between the encapsulation layer and the adhesive layer according to the embodiment of the present invention. As shown in FIG. 25 , the grating layer 8 is located between the encapsulation layer 31 and the adhesive layer 33 , or, FIG. 26 is a schematic diagram when the grating layer is located between the adhesive layer and the cover plate according to the embodiment of the present invention. As shown in FIG. 26 , the grating layer 8 is located between the adhesive layer 33 and the cover plate 34 . At this time, the grating layer 8 is an independent film layer, which is not multiplexed with the original film layer in the curved display panel, so there is no need to adjust the process of the original film layer, which reduces the manufacturing complexity of the curved display panel. .

It should be noted that, when the grating layer 8 is an independent film layer, the microstructure 28 may be located on the side of the grating layer 8 facing the base substrate 4 , or may be located on a side of the grating layer 8 facing away from the base substrate 4 . side. For example, referring to FIG. 26 again, when the grating layer 8 is located between the adhesive layer 33 and the cover plate 34, the microstructures 28 may be located on the side of the grating layer 8 that faces away from the base substrate 4, or, FIG. 27 shows the present invention Another schematic diagram when the grating layer provided in the embodiment is located between the adhesive layer and the cover plate, as shown in FIG. 27 , the microstructure 28 may also be located on the side of the grating layer 8 facing the base substrate 4 .

Further, referring to FIG. 28 and FIG. 29 , the functional layer 32 includes a touch layer 36 and a polarizer 37 , wherein the touch layer 36 is disposed on the side of the encapsulation layer 31 facing away from the base substrate 4 , and the touch layer 36 includes a touch layer 36 . The control electrode layer 38 and the insulating layer 39. At this time, FIG. 28 is another schematic diagram when the grating layer is located in the encapsulation layer and the adhesive layer provided by the embodiment of the present invention. As shown in FIG. 28, the grating layer 8 is located in the touch layer. 36 and the polarizer 37, or, FIG. 29 is another schematic diagram when the grating layer provided by the embodiment of the present invention is located between the encapsulation layer and the adhesive layer. As shown in FIG. 29, the grating layer 8 is located between the polarizer 37 and the adhesive layer. between layers 33.

In the manufacturing process of the curved display panel, since the array layer 5 , the encapsulation layer 31 and the touch layer 36 are formed by a semiconductor process in one production line, the grating layer 8 is arranged on the touch layer 36 to face the backing. On one side of the base substrate 4, there is no need to adjust the original process flow of the encapsulation layer 31 and the touch layer 36, which reduces the complexity of the process.

In an embodiment, FIG. 30 is another structural schematic diagram of the grating layer provided by the embodiment of the present invention. As shown in FIG. 30 , the grating layer 8 further includes a substrate 40 for carrying the microstructure 28 . The microstructure 28 is formed of a photosensitive adhesive material. Specifically, the grating layer 8 of this structure can be formed by UV transfer printing: the substrate 40 is attached to a transfer mold, and the transfer mold includes grooves for forming the microstructures 28 . The photosensitive adhesive material is filled in the gap between 40 and the transfer mold, and then the photosensitive adhesive material is cured and the transfer mold is removed, so that the cured photosensitive adhesive material forms the microstructure 28 .

Further, when the grating layer 8 is provided in the curved display panel as an independent film layer, a layer of adhesive layer can also be provided on the outside of the grating layer 8 to improve the adhesion between the grating layer 8 and other film layers, and further The stability of the grating layer 8 arrangement is improved. At this time, after curing the photosensitive adhesive material and removing the transfer mold, a layer may be attached to the side of the substrate 40 facing away from the microstructure 28 , and/or to the side of the microstructure 28 facing away from the substrate 40 . Adhesive layer, such as clear optical glue. In addition, in order to protect the formed grating layer 8 from damage, a layer of the substrate 40 can also be provided on the side of the substrate 40 facing away from the microstructure 28 or on the side of the adhesive layer attached to the substrate 40 facing away from the microstructure 28 The grating protective film can be removed when the grating layer 8 is subsequently placed in the curved display panel.

In addition, it should be noted that, whether the grating layer 8 is multiplexed as the original film layer in the curved display panel, or realized as an independent film layer, the pattern of the microstructure 28 can be formed by a customized mold, such as the above-mentioned transfer method. It can be realized by stamping, and the curved display panel can be flexibly designed for different bending conditions.

Based on the same inventive concept, an embodiment of the present invention provides a curved display device. FIG. 31 is a schematic structural diagram of the curved display device provided by an embodiment of the present invention, and FIG. 32 is a cross-sectional view of FIG. 31 along the B1-B2 direction, as shown in FIG. 31 As shown in FIG. 32 , the curved display device includes the above-mentioned curved display panel 100 and a middle frame 200 , wherein the curved display panel 100 is located in the accommodating space formed by the middle frame 200 . The curved display device may be any display device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television.

Based on the same inventive concept, an embodiment of the present invention provides an electronic device. FIG. 33 is a schematic structural diagram of the electronic device provided by the embodiment of the present invention. The electronic device includes the above-mentioned curved display panel 100 and an image processor 300 (Graphics Processing Unit). , GPU), wherein the image processor 300 is used to process the image displayed on the curved display panel 100 . The electronic device may be any device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television.

Based on the same inventive concept, an embodiment of the present invention provides a manufacturing method of a curved display panel, which is used to manufacture the above-mentioned curved display panel. With reference to FIGS. 3 to 6 , the curved display panel includes a display area 1 , and the display area 1 includes The flat display area 2 and the curved display area 3. The curved display area 3 includes a first curved area 10 and a second curved area 11. The curvature of the first curved area 10 is smaller than that of the second curved area 11. FIG. 34 is a flowchart of a manufacturing method provided by an embodiment of the present invention. As shown in FIG. 34 , the manufacturing method includes:

Step S1: an array layer 5 is formed on the base substrate 4, and a plurality of pixels 6 are arranged in the array layer 5, and each pixel 6 includes a plurality of sub-pixels 7, wherein the specific film structure of the array layer 5 has been described in the above-mentioned embodiment. It will be described in detail in , and will not be repeated here.

Step S2: A grating layer 8 is formed on the side of the array layer 5 facing away from the base substrate 4. The grating layer 8 includes a grating structure 9 located in the curved display area 3. The grating structure 9 includes a plurality of first grating units 91, one The grating unit 91 covers a sub-pixel 71 of a first color, and the sub-pixel 71 of the first color refers to a sub-pixel for generating a light signal of a first color, and the first color is the light generated by a plurality of sub-pixels 7 in the array layer. In any one of the colors of the signal, the light signal of the first color generated by the sub-pixels 71 of the first color is emitted through the first grating unit 91 .

Using the manufacturing method provided in the embodiment of the present invention, when forming the grating layer 8, for the first grating unit 91 covering the sub-pixels 71 of the first color, the grating period of the first grating unit 91 in the second curved area 11 is Less than the grating period of the first grating unit 91 in the first curved area 10, the diffraction angle of the diffracted light in the first curved area 10 and the second curved area 11 can be adjusted to different degrees, so that the first curved area 10 and the second curved area 11 can be adjusted to different degrees. The diffracted light in the two-curved area 11 tends to be emitted in the frontal viewing angle direction PP, which effectively improves the consistency of the brightness of the light in different areas of the curved display area 3 under the frontal viewing angle, thereby improving the positive viewing angle between the curved display area 3 and the flat display area 2. The consistency of the brightness of the light output under the viewing angle can significantly improve the color shift phenomenon of the curved display area 3 and optimize the display performance.

Further, with reference to FIG. 8, the process of forming the grating layer 8 includes: forming a plurality of microstructures 28 and a plurality of slits 29, the plurality of microstructures 28 are arranged at intervals in the curved display area 3, and the slits 29 are located in two adjacent Between the microstructures 28 , the width of the slits 29 is in the order of tens of micrometers for realizing diffraction, and the microstructures 28 can be light-transmitting prisms for refracting and/or scattering the light emitted by the sub-pixels 7 . At this time, the grating structure 9 can not only use the slits 29 to achieve diffraction, but also can further use the microstructures 28 to refract and/or scatter a part of the light when a part of the light is incident on the microstructure 28, so that a larger number of incident light can be refracted and/or scattered. The propagation direction of the light is adjusted, so as to increase the brightness of the light emitted by the curved display area 3 at a front viewing angle to a greater extent.

In one embodiment, referring to FIGS. 18 to 21 , after forming the array layer 5 on the base substrate 4 , the manufacturing method further includes: forming a cladding array layer 5 on the side of the array layer 5 facing away from the base substrate 4 , the encapsulation layer 31 for encapsulating the array layer 5, wherein the encapsulation layer 31 may include a plurality of alternately stacked organic encapsulation layers and stepless encapsulation layers; A functional layer 32 for realizing functions such as touch control and polarization; an adhesive layer 33 is formed on the side of the functional layer 32 facing away from the base substrate 4 ; a cover plate 34 is attached on the side of the adhesive layer 33 facing away from the substrate substrate 4 ; A protective film 35 is formed on the side of the cover plate 34 facing away from the base substrate 4 .

18 again, the functional layer 32 includes a grating structure 9. At this time, the functional layer 32 is multiplexed into a grating layer 8, and the functional layer 32 has functions such as touch control, polarizing light, and diffracting light. Or, please again Referring to FIG. 19, the adhesive layer 33 has a grating structure 9. At this time, the adhesive layer 33 is multiplexed into the grating layer 8. The adhesive layer 33 has the functions of adhering and diffracting light, or, please refer to FIG. 20 again, the cover plate 34 Including the grating structure 9, at this time, the cover plate 34 is multiplexed into the grating layer 8, and the cover plate 34 also has the function of diffracting light, or, please refer to FIG. 21 again, the protective film 35 includes the grating structure 9, at this time, the protection The film 35 is multiplexed into the grating layer 8, and the protective film 35 has both the functions of protection and diffraction of light. With this manufacturing method, the grating layer 8 can be formed by multiplexing the original film layers in the curved display panel, and there is no need to add an additional film layer, so that the grating layer 8 does not need to occupy additional film space, which is more beneficial to the curved display panel. thin and light design.

Further, referring to FIG. 23 , when the functional layer 32 includes the grating structure 9 , the process of forming the functional layer 32 includes: forming a touch electrode layer 38 on the side of the encapsulation layer 31 facing away from the base substrate 4 ; 38, an insulating layer 39 is formed on the side facing away from the base substrate 4, the insulating layer 39 is etched, and a plurality of microstructures 28 are formed in the curved display area 3; Polarizer 37. That is to say, in this manufacturing method, the grating layer 8 and the insulating layer 39 in the functional layer 32 are multiplexed.

In the manufacturing process of the curved display panel, the array layer 5 , the encapsulation layer 31 and the touch layer 36 are formed by a semiconductor process on a production line. After the touch layer 36 is formed, the polarizer 37 , the adhesive layer 33 , the Structures such as the cover plate 34 and the protective film 35 are placed on the side of the touch layer 36 facing away from the array layer 5 . When the grating layer 8 is multiplexed as the insulating layer 39 in the functional layer 32 , there is no need to adjust the original process flow of the encapsulation layer 31 and the touch electrode layer 38 , and it is only necessary to add light in the last process of forming the insulating layer 39 The engraving process is enough, and the process complexity is low.

Alternatively, when the grating layer 8 is multiplexed into the cover plate 34, with reference to FIG. 20, FIG. 35 is a schematic diagram of the manufacturing process of the cover plate when the grating layer and the cover plate are multiplexed according to the embodiment of the present invention, as shown in FIG. The process of the cover plate 34 includes: cutting a slit 29 on the side of the cover plate 34 facing away from the base substrate 4 by a laser process, such as a laser compact processing process, at this time, the slit 29 and the microstructure 28 are located on the cover plate 34 or, FIG. 36 is a schematic diagram of another manufacturing process of the cover plate when the grating layer and the cover plate are multiplexed according to the embodiment of the present invention, as shown in FIG. 36, the cover plate 34 is formed The process includes: using the hot bending forming process to form the microstructure 28 on the side of the cover plate 34 facing the base substrate 4, specifically, in the 3D hot bending mold 41, the area corresponding to the curved display area 3 is processed by a laser process or the like. A concave groove is formed that is complementary to the microstructure 28. During the hot bending process, the microstructure 28 is formed on the inner side of the cover plate 34 by using the 3D hot bending mold 41. At this time, the slit 29 and the microstructure 28 are located in the cover plate. 34 is close to the side of the base substrate 4 . When the slits 29 and the microstructures 28 are located on different sides of the cover plate 34 , by selecting different fabrication processes to form the slits 29 and the microstructures 28 in the cover plate 34 , the practicability of the process can be improved and the difficulty of the process can be simplified.

In one embodiment, referring to FIGS. 25 and 26 , after forming the array layer 5 on the base substrate 4 , the manufacturing method further includes: forming a cladding array layer 5 on the side of the array layer 5 facing away from the base substrate 4 , the encapsulation layer 31 for encapsulating the array layer 5, wherein the encapsulation layer 31 may include a plurality of alternately stacked organic encapsulation layers and stepless encapsulation layers; A functional layer 32 for realizing functions such as touch control and polarization; an adhesive layer 33 is formed on the side of the functional layer 32 facing away from the base substrate 4 ; a cover plate 34 is attached on the side of the adhesive layer 33 facing away from the substrate substrate 4 ; A protective film 35 is formed on the side of the cover plate 34 facing away from the base substrate 4 . 25 , the grating layer 8 is located between the encapsulation layer 31 and the adhesive layer 33 , or, referring to FIG. 26 again, the grating layer 8 is located between the adhesive layer 33 and the cover plate 34 . With this manufacturing method, the grating layer 8 is an independent film layer, which is not multiplexed with the original film layer in the curved display panel, so there is no need to adjust the process of the original film layer, which reduces the cost of the curved display panel. production complexity.

Further, when the grating layer 8 is an independent film layer, with reference to FIG. 30 , FIG. 37 is a process flow diagram of the grating layer provided by the embodiment of the present invention, and FIG. 38 is a structural flow chart corresponding to FIG. 37 , as shown in FIG. 37 and FIG. 38, the process of forming the grating layer 8 includes:

Step K1 : attach the substrate 40 to the transfer mold 42 , the transfer mold 42 includes grooves 43 for forming the microstructures 28 , and the grooves 43 are located in the area of the transfer mold 42 corresponding to the curved display area 3 .

Step K2: Filling the gap between the substrate 40 and the transfer mold 42 with a photosensitive adhesive material 44 .

Step K3 : irradiating the photosensitive adhesive material 44 with an ultraviolet light to realize curing of the photosensitive adhesive material 44 .

Step K4: The transfer mold 42 is removed.

Specifically, in different curved display panels, if the shape and height of the microstructures 28 in the grating layer 8 are different, it is only necessary to adjust the grooves 43 of the transfer mold 42 adaptively, and it is not necessary to adjust the manufacturing process. It has an impact and improves mass producibility.

It should be noted that the transfer mold 42 may be provided with an area for accommodating the photosensitive adhesive material 44 at the position corresponding to the plane display area 2 , or may not be provided with an area for accommodating the photosensitive adhesive material 44 , depending on the structure of the transfer mold 42 , Please refer to FIG. 38 again, the area where the flat display area 2 is located can also be filled with photosensitive adhesive material 44, but the photosensitive adhesive material 44 in this area is a structure with a flat surface and does not have a slit 29, or, FIG. 39 is a diagram of Another structural flowchart corresponding to 37, as shown in FIG. 39, the area where the flat display area 2 is located may not be filled with the photosensitive adhesive material 44.

Further, after step K4, the process of forming the grating layer 8 may further include:

Step K5: Attach a layer of the first adhesive layer 45 and the grating protective film 46 on the side of the substrate 40 facing away from the microstructure 28, and/or attach a layer on the side of the microstructure 28 facing away from the substrate 40 The second adhesive layer 47; wherein, the first adhesive layer 45 and the second adhesive layer 47 can be transparent optical adhesives to improve the adhesion between the grating layer 8 and other film layers in the curved display panel to avoid external force factors The position of the grating layer 8 is shifted due to the action of , and the grating protective film 46 is used to protect the formed grating layer 8 from damage. When the grating layer 8 is subsequently placed in the curved display panel, it can be removed.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it is still The technical solutions recorded in the foregoing embodiments may be modified, or some or all of the technical features thereof may be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention .

Claims (24)

1. A curved display panel, characterized in that, comprising: a display area, the display area includes a flat display area and a curved display area; a base substrate, the side of the base substrate facing the light-emitting direction of the curved display panel is provided with an array layer, a plurality of pixels are arranged in the array layer, and each of the pixels includes a plurality of sub-pixels; a grating layer, the grating layer is located on the side of the array layer facing away from the base substrate, and the grating layer includes a grating structure located in the curved display area; Wherein, the grating structure includes a plurality of first grating units, one of the first grating units covers one sub-pixel of the first color, and the sub-pixel of the first color refers to the sub-pixel used to generate the light signal of the first color, The first color is any one of the colors of light signals generated by a plurality of sub-pixels in the array layer, and the first color light signals generated by the sub-pixels of the first color pass through the first grating unit shoot out; The curved display area includes a first curved area and a second curved area, the curvature of the first curved area is smaller than that of the second curved area, and the first grating located in the first curved area The grating period of the unit is greater than the grating period of the first grating unit located in the second curved surface area. 2. The curved display panel according to claim 1, wherein, along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the curved curvature of the curved display area increases, and the gratings of the plurality of the first grating units in the grating structure decreasing period; Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far away from the flat display area. 3. The curved display panel according to claim 2, wherein, The grating periods of the plurality of first grating units in the grating structure decrease linearly. 4. The curved display panel according to claim 2 or 3, further comprising: The diffraction efficiency of the plurality of the first grating units in the grating structure increases. 5. The curved display panel according to claim 1, wherein, Each of the pixels includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the grating structure includes a red grating unit, a green grating unit and a blue grating unit, wherein the red grating unit covers the red sub-pixels pixel, the red light signal generated by the red sub-pixel is emitted through the red grating unit, the green grating unit covers the green sub-pixel, and the green light signal generated by the green sub-pixel is emitted through the green grating unit, The blue grating unit covers the blue sub-pixel, and the blue light signal generated by the blue sub-pixel is emitted through the blue grating unit; For the same pixel, the grating period of the red grating unit covering the red sub-pixel is Pr, the grating period of the green grating unit covering the green sub-pixel is Pg, and the grating period of the blue sub-pixel covering the The grating period of the blue grating unit is Pb, Pr>Pg>Pb. 6. The curved display panel according to claim 1, wherein, The grating structure includes a plurality of microstructures and a plurality of slits, the plurality of the microstructures are arranged at intervals in the curved display area, the slits are located between two adjacent microstructures, and the microstructures are located between two adjacent microstructures. The structure is used to refract and/or scatter the light emitted by the sub-pixels. 7. The curved display panel according to claim 6, wherein, along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the curved curvature of the curved display area increases, and the degree of light scattering of the plurality of microstructures in the grating structure and/or an increasing degree of light refraction; Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far away from the flat display area. 8. The curved display panel according to claim 7, wherein, Along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the heights of the plurality of the microstructures in the respective directions perpendicular to the tangential plane of the base substrate increase, the base substrate The tangent plane is the tangent plane in the base substrate at the position corresponding to the center point of the microstructure. 9. The curved display panel according to claim 6, wherein, The microstructure has a first cross-section, and the first cross-section is parallel to a cut plane of the base substrate, and the cut plane of the base substrate is a position in the base substrate corresponding to the center point of the microstructure The shape of the first section is a rectangle, a triangle, an ellipse, a circle or a rhombus. 10. The curved display panel according to claim 6, wherein, The microstructures are strip-like structures, and in the curved display area, a plurality of the microstructures are arranged along the first direction, and each of the microstructures extends along a second direction, and the first direction is Along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far away from the flat display region, the second direction intersects the first direction. 11. The curved display panel according to claim 6, wherein the curved display panel further comprises an encapsulation layer, a functional layer, an adhesive layer, a cover plate and a protective film arranged in layers: the encapsulation layer is used to encapsulate the array layer; the functional layer is located on the side of the encapsulation layer facing away from the base substrate; the adhesive layer is located on the side of the functional layer facing away from the base substrate; the cover plate is located on the side of the adhesive layer facing away from the base substrate; the protective film is located on the side of the cover plate facing away from the base substrate; Wherein, the functional layer includes the grating structure; Or, the adhesive layer includes the grating structure; Or, the cover plate includes the grating structure; Or, the protective film includes the grating structure. 12 . The curved display panel according to claim 11 , wherein the functional layer comprises a laminated touch layer and a polarizer; 12 . The touch layer is disposed on the side of the encapsulation layer facing away from the base substrate, the touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on the side of the touch electrode layer facing away from the substrate. one side of the base substrate; the polarizer is arranged on the side of the insulating layer facing away from the base substrate; Wherein, the insulating layer includes the grating structure. 13 . The curved display panel according to claim 6 , wherein the curved display panel further comprises a laminated encapsulation layer, a functional layer, an adhesive layer, a cover plate and a protective film; 13 . the encapsulation layer is used to encapsulate the array layer; the functional layer is located on the side of the encapsulation layer facing away from the base substrate; the adhesive layer is located on the side of the functional layer facing away from the base substrate; the cover plate is located on the side of the adhesive layer facing away from the base substrate; the protective film is located on the side of the cover plate facing away from the base substrate; The grating layer is located between the encapsulation layer and the adhesive layer, or the grating layer is located between the adhesive layer and the cover plate. 14. The curved display panel according to claim 13, wherein the functional layer comprises a laminated touch layer and a polarizer; The touch layer is disposed on the side of the encapsulation layer facing away from the base substrate, the touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on the side of the touch electrode layer facing away from the substrate. one side of the base substrate; the polarizer is arranged on the side of the insulating layer facing away from the base substrate; The grating layer is located between the touch layer and the polarizer, or the grating layer is located between the polarizer and the adhesive layer. 15. The curved display panel according to claim 6, wherein, The grating layer further includes a substrate for carrying the microstructure, and the microstructure is formed of a photosensitive adhesive material. 16. A curved display device, comprising a middle frame and the curved display panel according to any one of claims 1 to 15, wherein the curved display panel is located in a accommodating cavity formed by the middle frame . 17. An electronic device, characterized in that it comprises the curved display panel according to any one of claims 1 to 15 and an image processor, wherein the image processor is used to process the images displayed on the curved display panel. image. 18. A method for manufacturing a curved display panel, wherein the curved display panel includes a display area, the display area includes a flat display area and a curved display area, and the curved display area includes a first curved area and a second curved display area. a curved area, the bending curvature of the first curved area is smaller than that of the second curved area; The manufacturing method includes: forming an array layer on the base substrate, the array layer is provided with a plurality of pixels, each of the pixels includes a plurality of sub-pixels; A grating layer is formed on the side of the array layer facing away from the base substrate, and the grating layer includes a grating structure located in the curved display area, wherein the grating structure includes a plurality of first grating units, one of which is The first grating unit covers a sub-pixel of the first color, and the sub-pixel of the first color refers to the sub-pixel used to generate the light signal of the first color, and the first color is generated by the plurality of sub-pixels in the array layer. any one of the colors of the generated optical signals, the first color optical signals generated by the sub-pixels of the first color are emitted through the first grating unit; the first grating located in the first curved surface area The grating period of the unit is greater than the grating period of the first grating unit located in the second curved surface area. 19. The manufacturing method according to claim 18, wherein the process of forming the grating layer comprises: A plurality of microstructures and a plurality of slits are formed, a plurality of the microstructures are arranged at intervals in the curved display area, the slits are located between two adjacent microstructures, and the microstructures are used to The light emitted by the sub-pixels is refracted and/or scattered. 20. The manufacturing method according to claim 19, wherein after forming the array layer on the base substrate, the manufacturing method further comprises: forming an encapsulation layer on the side of the array layer facing away from the base substrate; forming a functional layer on the side of the encapsulation layer facing away from the base substrate; forming an adhesive layer on the side of the functional layer facing away from the base substrate; attaching a cover plate on the side of the adhesive layer facing away from the base substrate; forming a protective film on the side of the cover plate facing away from the base substrate; Wherein, the functional layer includes the grating structure; or the adhesive layer includes the grating structure; or the cover plate includes the grating structure; or the protective film includes the grating structure. 21. The manufacturing method according to claim 20, wherein when the functional layer comprises the grating, the process of forming the functional layer comprises: forming a touch electrode layer on the side of the encapsulation layer facing away from the base substrate; An insulating layer is formed on the side of the touch electrode layer facing away from the base substrate, the insulating layer is etched, and a plurality of the microstructures are formed in the curved display area; A polarizer is arranged on the side of the insulating layer facing away from the base substrate. 22. The manufacturing method according to claim 20, wherein when the cover plate includes the grating structure, the process of forming the cover plate comprises: The slits are cut on the side of the cover plate facing away from the base substrate by a laser process, or the slits are formed on the side of the cover plate facing the base substrate by a thermal bending process. described microstructure. 23. The manufacturing method according to claim 18, wherein after forming the array layer on the base substrate, the manufacturing method further comprises: forming an encapsulation layer on the side of the array layer facing away from the base substrate; forming a functional layer on the side of the encapsulation layer facing away from the base substrate; forming an adhesive layer on the side of the functional layer facing away from the base substrate; attaching a cover plate on the side of the adhesive layer facing away from the base substrate; forming a protective film on the side of the cover plate facing away from the base substrate; Wherein, the grating layer is located between the encapsulation layer and the adhesive layer, or the grating layer is located between the adhesive layer and the cover plate. 24. The manufacturing method according to claim 18, wherein the process of forming the grating layer comprises: attaching the substrate to a transfer mold, the transfer mold comprising grooves for forming the microstructure; Filling the gap between the base material and the transfer mold with a photosensitive adhesive material; curing the photosensitive adhesive material; Remove the transfer mold.

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