CN110880528B - OLED display panel and display device - Google Patents

Abstract

The present application relates to the field of display technology, and discloses an OLED display panel and a display device. The OLED display panel includes: a substrate substrate; a pixel defining layer formed on the substrate substrate, and the pixel defining layer has a one-to-one correspondence with a plurality of pixel units The recessed portion, wherein each recessed portion has a bottom surface and a side surface, and the angle formed between the side surface and the bottom surface is an obtuse angle; the light-emitting functional layers formed in the recessed portion and corresponding to the pixel units one-to-one, each pair of light-emitting functional layers and In the recessed portion, the light-emitting functional layer covers the bottom surface of the recessed portion and covers at least a part of the side surface of the recessed portion. The OLED display panel disclosed in the present application can improve the display defects related to the viewing angle, so as to enhance the display effect.

Description

An OLED display panel and display device

technical field

The present application relates to the field of display technology, and in particular, to an OLED display panel and a display device.

Background technique

Due to the technological maturity and market expansion of OLED products, more and more products adopt OLED display technology, among which, the advantages of OLED display technology mainly lie in its flexible characteristics. However, due to the characteristics of OLED products, as shown in Figure 1, in the microcavity structure of the existing OLED display panel, only the bottom surface of the microcavity is evaporated of the luminescent material. It has different display effects in different directions, including color parameters such as brightness and chromaticity.

The white light displayed by OLED is the composite light of R/G/B three colors synthesized by a certain ratio. When the brightness and color coordinates of one or several colors deviate from the original set ratio, there will be color deviation. , resulting in visual chromatic aberration. For example, when the brightness of blue is attenuated in white light, while the red and green light remains unchanged, the color after the ratio will appear yellowish. Therefore, in the case of display with a larger viewing angle direction or a larger angle, the color of the screen will deviate to different degrees, showing states such as red, green, and yellow.

SUMMARY OF THE INVENTION

The present invention provides an OLED display panel, which can have strong light output in a specific direction to compensate for the attenuation of OLED devices due to different angles caused by microcavities, thereby improving the display defects related to viewing angles and enhancing the display. Effect.

In order to achieve the above object, the present application provides an OLED display panel, comprising:

substrate substrate;

A pixel definition layer formed on the base substrate, the pixel definition layer having recesses corresponding to a plurality of pixel units one-to-one, wherein each of the recesses has a bottom surface and a side surface, and the side surfaces and the The angle formed between the bottom surfaces is an obtuse angle;

A light-emitting functional layer formed in the recessed portion and corresponding to the pixel units one-to-one, in each pair of the light-emitting functional layer and the recessed portion, the light-emitting functional layer covers the bottom surface of the recessed portion and covers the bottom surface of the recessed portion. at least part of the side.

In the above-mentioned OLED display panel, the pixel defining layer has a plurality of concave portions corresponding to the pixel units one-to-one, and the angle formed between the bottom surface and the side surface of the concave portion is an obtuse angle. At least a part of the light-emitting functional layer is deposited, so that the light-emitting functional layer on the bottom surface of the recessed portion emits light normally, and the light-emitting functional layer disposed on the side of the recessed portion can also emit light normally, thereby forming an array with a certain angle of light output to compensate for the OLED panel due to the The phenomenon of attenuation at different angles brought about by the microcavity.

Therefore, in the OLED display panel of the present application, by forming a light-emitting functional layer on the bottom surface and the side surface of each recessed portion, it is possible to have strong light output in the direction of the side surface, so as to make up for the difference of the OLED device due to the microcavity. The phenomenon of angle attenuation, thereby improving the display defects related to the viewing angle to enhance the display effect.

Preferably, the light-emitting functional layer on the side surface of each of the recesses extends to the surface of the peripheral pixel defining layer facing away from the base substrate.

Preferably, the light-emitting functional layer includes an anode layer and an organic light-emitting layer.

Preferably, the edge region of the base substrate is in a curved state, and the larger the bending angle of the edge region, the smaller the included angle formed between the bottom surface and the side surface of the concave portion located in the edge region.

Preferably, among the plurality of concave portions located in the edge region, along the direction from the connection end of the edge region to the free end, the height of the side of each concave portion away from the free end is smaller than the side of the concave portion close to the free end side height.

Preferably, the angle formed between the bottom surface and the side surface of each concave portion located in the non-edge region of the base substrate is 130°-145°.

Preferably, the height of the pixel defining layer is 1.5um.

Preferably, the present application further provides a display device comprising the above-mentioned OLED display panel.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of an OLED display panel in the prior art;

FIG. 2 is a view showing a cross-sectional structure of an OLED display panel in the application;

FIG. 3 is a schematic diagram of light emitting of an OLED display panel in the application;

FIG. 4 is a schematic diagram of light emitting of an OLED display panel in the prior art;

FIG. 5 is a schematic diagram of light emitting of an OLED display panel in the present application;

FIG. 6 is a partial structural schematic diagram of an edge region of an OLED display panel in the present application.

Detailed ways

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 are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 , in the conventional OLED display panel, the pixel defining layer 02 has recesses corresponding to the pixel units one-to-one to form a microcavity, and the bottom surface of the microcavity has a light-emitting functional layer 03 . The light-emitting direction of the light-emitting functional layer refers to The direction of the arrow in the figure. It can be seen from FIG. 1 that the light-emitting direction of each microcavity of the OLED display panel is relatively concentrated in the direction perpendicular to the base substrate 01, which will cause the light-emitting attenuation to occur under the change of viewing angle, which will lead to poor display. .

Based on the above situation, please refer to FIG. 2, the present invention provides an OLED display panel, comprising: a base substrate 1; a pixel defining layer 2 formed on the base substrate 1, the pixel defining layer 2 having a A corresponding recessed portion 3, wherein each recessed portion 3 has a bottom surface and a side surface, and the angle formed between the side surface and the bottom surface is an obtuse angle; the light-emitting functional layer 4 formed in the recessed portion 3 and corresponding to the pixel units one-to-one, In each pair of the light-emitting functional layer 4 and the recessed portion 3 , the light-emitting functional layer 4 covers the bottom surface of the recessed portion 3 and covers at least a part of the side surface of the recessed portion 3 .

In the OLED display panel in the present application, the pixel defining layer 2 has a plurality of recessed portions 3 corresponding to the pixel units one-to-one. The bottom surface and the side surface of the recessed portion 3 are formed with a light-emitting functional layer 4. The light-emitting functional layer 4 on the bottom surface is normally In the case of emitting light, the light emitting functional layer 4 on the side can also emit light normally in a specific direction, and the light emitting direction of the light emitting functional layer 4 on the side and the base substrate 1 form a certain angle. Referring to FIG. 3 , the solid arrow in the figure is the light emitting direction of the light emitting functional layer 4 on the bottom surface, and the dotted arrow is the light emitting direction of the side light emitting functional layer 4 , wherein the length of the line represents the intensity of the light. As can be seen from FIG. 3 , the light emitted from the light-emitting functional layer 4 on the bottom surface is relatively concentrated in the direction perpendicular or nearly vertical to the base substrate 1 , and less light is emitted to both sides, while the light-emitting of the light-emitting functional layer 4 on the side is relatively concentrated in the direction of vertical or nearly vertical. The direction is vertical or nearly vertical to the side surface, and since the angle between the side surface and the bottom surface is an obtuse angle, the light-emitting functional layer 4 on the side surface can compensate for the attenuation of the light emitted by the light-emitting functional layer 4 on the bottom surface caused by different angles, thereby The light output in each light output direction of each concave portion 3 is made uniform.

It should be noted that, the size of the angle between the bottom surface and the side surface of the above-mentioned recessed portion 3 can be designed according to different product characteristics.

Therefore, in the OLED display panel of the present application, the light-emitting functional layer 4 is formed on the bottom surface and the side surface of the recessed portion 3, so that each part of the light-emitting functional layer 4 forms an array with a certain angle of light output, and there is a relatively high degree of light emission in a specific direction. Strong light output, thereby improving the display defects related to viewing angles and enhancing the display effect.

The above-mentioned light-emitting functional layer 4 may include an anode layer 41 and an organic light-emitting layer 42. Further, in the above-mentioned OLED display panel, the light-emitting functional layer 4 on the side extends to the surface of the pixel defining layer 2 around the recessed portion 3, so as to make more A lot of luminescent materials can be evaporated to the side of the recessed part 3, and the area of the luminescent functional layer 4 on the side can be enlarged as much as possible, so that the phenomenon of different angle attenuation caused by the microcavity effect can be effectively compensated. production of products.

In an embodiment, most of the existing OLED products have curved edges. In this case, the edge region 11 of the base substrate 1 will be in a curved state, which will cause the viewing angle to be attenuated. At larger viewing angles, the normal color shift direction will also change, and the brightness will also be attenuated. Therefore, the angle between the side surface and the bottom surface of the concave portion 3 of the concave portion 3 in the edge area 11 is changed, so that the color ratio is restored to balance, and when the bending angle of the edge area 11 is larger, it is located in the edge area. The smaller the angle formed between the bottom surface and the side surface of the concave portion 3 of 11 is.

Referring to FIG. 4 and FIG. 5 , the solid arrows in the figures are the light-emitting directions of the light-emitting functional layer 4 on the bottom surface, and the dotted arrows are the light-emitting directions of the light-emitting functional layers 4 on the side surfaces, wherein the length of the lines represents the intensity of the light, and the dotted box represents The range of light received at the front view angle. When the bending angle of the edge region 11 of the OLED product is 60°, the included angle between the bottom surface and the side surface of each recessed portion 3 in the edge region 11 can be set between 120°-150°, and the pixels define The height of layer 2 remains unchanged, and the evaporation of the luminescent material is carried out. Since the light emitting of the light-emitting functional layer 4 on the side is enhanced at the front view angle and mixed with the original light source, it forms a complementary effect on the original light source, so that the light output at the front view angle is enhanced and the parallax is reduced.

Further, when the bending angle of the edge region 11 is too large, for example greater than 60°, in the plurality of recesses 3 located in the edge region 11, along the direction from the connection end to the free end of the edge region 11, each recess 3 The height of the side away from the free end is less than the height of the side closer to the free end. 6 , the pixel defining layer 2 between every two adjacent recesses 3 is in the shape of a slope. Since the bending angle is too large, the light-emitting direction at the slope of the pixel defining layer 2 will reach the pixel defining layer in the non-edge area. 2, making it difficult to transmit light perpendicular to the non-edge area. By increasing the heights of the slopes of the pixel defining layers 2 in the edge region 11 successively, the light output perpendicular to the non-edge region is enhanced, thereby improving the problem of poor display and enhancing the display effect.

It should be noted that the angle between the bottom surface and the side surface of the concave portion 3 in the edge region 11 and the height of the slope of the pixel defining layer 2 should be designed according to different product characteristics.

In an embodiment, the color shift of the plurality of concave portions 3 located in the non-edge area will also change with the viewing angle due to the micro-cavity effect of the OLED device, that is, a larger color shift value may occur at a certain angle. , in general, the color shift value that occurs between the viewing angle of 30°-50° is larger. Therefore, the angle between the bottom surface and the side surface of each recessed portion 3 in the non-edge region can be controlled between 130°-145°, and the height of the pixel defining layer 2 can also be selected to be 1.5um, so that The OLED display panel in the present application has optical compensation in a specific direction, thereby improving the display effect.

Generally, due to the different attenuation conditions of the three colors, the brightness of blue is relatively fast attenuated, which has a greater impact on color shift. Therefore, it is preferable to process blue pixels, so that under the condition of simplifying the process, the maximum improvement can be achieved. Depending on the role.

Further, the present invention can also provide a display device including the above-mentioned OLED display panel. Since the above-mentioned display panel can improve the display defects related to the viewing angle, and can also change the display effect of the curved edge area 11, it can ensure The display effect of this display device.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (7)

1. An OLED display panel, characterized in that, comprising: substrate substrate; A pixel definition layer formed on the base substrate, the pixel definition layer having recesses corresponding to a plurality of pixel units one-to-one, wherein each of the recesses has a bottom surface and a side surface, and the side surfaces and the The angle formed between the bottom surfaces is an obtuse angle; A light-emitting functional layer formed in the recessed portion and corresponding to the pixel units one-to-one, in each pair of the light-emitting functional layer and the recessed portion, the light-emitting functional layer covers the bottom surface of the recessed portion and covers the bottom surface of the recessed portion. at least part of the side; The edge region of the base substrate is in a curved state, and the larger the bending angle of the edge region, the smaller the included angle formed between the bottom surface and the side surface of the concave portion located in the edge region. 2 . The OLED display panel according to claim 1 , wherein the light-emitting functional layer on the side surface of each recessed portion extends to the surface of the peripheral pixel defining layer facing away from the base substrate. 3 . 3. The OLED display panel according to claim 2, wherein the light-emitting functional layer comprises an anode layer and an organic light-emitting layer. 4 . The OLED display panel according to claim 1 , wherein among the plurality of concave parts located in the edge region, along the direction from the connection end to the free end of the edge region, each concave part is far away from the The height of the side of the free end is less than the height of the side adjacent to the free end. 5 . The OLED display panel according to claim 1 , wherein the angle formed between the bottom surface and the side surface of each concave portion in the non-edge region of the base substrate is 130°-145°. 6 . 6 . The OLED display panel of claim 5 , wherein the pixel defining layer has a height of 1.5um. 7 . 7. A display device, comprising the OLED display panel according to any one of claims 1-6.

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