CN114530480A - Display panel, display device and manufacturing method of display panel - Google Patents

Abstract

The invention discloses a display panel, a display device and a manufacturing method of the display panel, wherein the display panel comprises: the touch screen comprises an array substrate, a touch pad and a cushion layer; the array substrate comprises a first flat layer and a display function layer; the display function layer is disposed on the first planarization layer; the touch panel comprises an organic film layer, and the organic film layer is arranged on one side of the display function layer, which is far away from the first flat layer; the cushion layer is arranged between the first flat layer and the organic film layer and is close to the cutting edge of the display panel, and the cushion layer is used for adhering the first flat layer and the organic film layer. The invention reduces the risk of stripping between the organic film layer and the flat layer of the display panel and improves the yield of products.

Description

A display panel, a display device and a manufacturing method of the display panel

technical field

The present invention relates to the field of display technology, and in particular, to a display panel, a display device and a manufacturing method of the display panel.

Background technique

At present, the application of OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch display screens on electronic products such as mobile phones has become the mainstream, and the mainstream production process is the FMLOC (Flexible Multi-Layer OnCell Touch) touch process. Among them, the flexible OLED production line is highly intergenerational, and the number of single screens that can be produced at the same time is large and the cost is low. However, the generational height means that more times need to be cut after the film process is completed; during and after the cutting process, the difference between the OC (Organic) layer of the touch panel and the interlayer planarization (PLN) layer of the array substrate Peeling phenomenon (OCPeeling) is easy to occur between. After peeling occurs, the separated OC film debris will fall to the pixel color development area, resulting in poor color development and dark spots; at the same time, it is easy to cause defects such as sticking and falling off and cutting edge bubbles during the cutting process, which affects the equipment capacity. .

It can be seen that the current display panel is prone to OC Peeling, which leads to defective products.

SUMMARY OF THE INVENTION

The embodiments of the present application reduce the risk of peeling between the organic film layer and the flat layer of the display panel by providing a display panel, a display device, and a manufacturing method of the display panel, and improve product yield.

In the first aspect, the present application provides the following technical solutions through an embodiment of the present application:

A display panel, comprising: a display area and a boundary area surrounding the periphery of the display area, the boundary area comprising: a first flat layer; a display function layer covering the first flat layer; an organic film layer, Covering the display function layer on the side away from the first flat layer; a cushion layer is arranged between the organic film layer and the first flat layer and close to the edge of the cutting line.

Optionally, the edge of the display function layer extends toward the dicing lane, and the cushion layer is formed between the organic film layer and the first flat layer.

Optionally, the display functional layer includes a second flat layer, the second flat layer extends toward the dicing line, and a cushion layer is formed between the organic film layer and the first flat layer.

Optionally, the display function layer includes a pixel definition layer, the pixel definition layer extends toward the dicing line, and a cushion layer is formed between the organic film layer and the first flat layer.

Optionally, the display function layer further includes an insulating buffer layer, the insulating buffer layer is disposed on the side of the pixel definition layer away from the first flat layer, and extends from the pixel definition layer toward the pixel definition layer. A dicing line is formed, and a cushion layer is formed between the organic film layer and the first flat layer.

Optionally, the display function layer includes a pixel definition layer and an insulating buffer layer, the insulating buffer layer covers a side of the pixel definition layer away from the first flat layer, and the insulating buffer layer extends toward the side of the first flat layer. the dicing line, and a cushion layer is formed between the organic film layer and the first flat layer.

Optionally, the underlayer includes a patterned unit array, and each adjacent patterned unit in the patterned unit array has a gap.

Optionally, any one or more of the following graphics unit:

Bar, Polyline, Square, Circle.

In the second aspect, the present application provides the following technical solutions through an embodiment of the present application:

A display device is characterized by comprising the display panel according to any one of the foregoing first aspects.

In the third aspect, the present application provides the following technical solutions through an embodiment of the present application:

A method for manufacturing a display panel, comprising:

manufacturing a first flat layer of an array substrate; forming a display functional layer and a pad layer on the first flat layer; the pad layer is close to the dicing line; forming an organic film layer on the display functional layer and the pad layer, The edge region of the organic film layer close to the dicing lane is adhered to the first flat layer through the cushion layer.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

In the display panel and the display device provided by the embodiments of the present invention, by disposing a cushion layer between the organic film layer at the cutting edge of the display panel and the first flat layer, the direct connection between the organic film layer and the first flat layer is avoided, and the improvement is improved. It improves the adhesion of the organic film layer and reduces the risk of peeling off the organic film layer; and the cushion layer reduces the step difference of the organic film layer near the cutting edge, further reducing the risk of peeling off the organic film layer, that is, reducing the display panel. The risk of OC Peeling prevents debris from overlapping on the cutting lane or cutting equipment, effectively improving product yield and equipment productivity.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1A shows a schematic structural diagram of an implementation manner of a display panel provided in an embodiment of the present invention;

FIG. 1B is a schematic diagram showing the positional structure of different film layers of the display panel provided in the embodiment of the present invention in the display area;

FIG. 2 shows a schematic structural diagram of the display panel provided in the embodiment of the present invention before cutting (display panel large plate);

FIG. 3 shows a schematic structural diagram of a prior art display panel peeling off under a microscope;

FIG. 4 shows a schematic diagram of the effect of the display panel of the prior art producing poor debris under a microscope;

5-10 and FIG. 16 respectively show structural schematic diagrams of seven different implementations of the display panel provided in the embodiment of the present invention;

11 to 15 respectively show schematic structural diagrams of five different implementation manners of a patterned cell array in an embodiment of the present invention.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present disclosure.

Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. The figures are not to scale, some details have been exaggerated for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art should Regions/layers with different shapes, sizes, relative positions can be additionally designed as desired.

In the context of this disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present therebetween. element. In addition, if a layer/element is "on" another layer/element in one orientation, then when the orientation is reversed, the layer/element can be "under" the other layer/element.

In a display panel provided by an embodiment of the present invention, compared with the prior art, the boundary area around the display area of the display panel is structurally improved, so that the organic film layer and the cover array on the touch side of the display panel can be displayed. The connection between the first flat layers of the substrate is more stable, and the peeling of the organic film layer is avoided. The concept of the present invention will be described and described in detail below through specific examples.

Referring to FIG. 1A , a display panel 100 provided in an embodiment of the present invention includes an array substrate 10 (TFT substrate), a touch panel 20 and a pad layer 31 . The positions of the above-mentioned film layers in the display area of the display panel 100 can be referred to as shown in FIG. 1B . The array substrate 10 includes: a substrate 101, such as a glass substrate; a flexible layer 102 disposed on the substrate 101, such as a PI (Polyimide, polyimide) film layer; a TFT (Thin Film Transistor, thin film transistor) array disposed on the flexible layer 103 ; the first flat layer 11 disposed on the TFT array 103 ; and the display function layer 10 a disposed on the first flat layer 11 . The display function layer 10a is disposed on the first flat layer 11; the touch panel 20 includes an organic film layer 22, and the organic film layer 22 (Organic, OC film layer) is disposed on the side of the display function layer 10a away from the first flat layer 11; The cushion layer 31 is disposed between the organic film layer 22 and the first flat layer 11 and is close to the cutting edge of the display panel.

Referring to FIG. 1B and FIG. 2 , the display panel 100 in this embodiment can be obtained by cutting the large display panel 200 . In other words, each large display panel 200 may include a plurality of display panels 100 . A cutting lane 50 is disposed between every two display panels 100 , and the edge of the display panel 100 close to the cutting lane 50 is the cutting edge. In this embodiment, the edge portion of the display panel 100 near the dicing line 50 may be defined as the boundary area 40 , and the pad layer 31 may be disposed in the boundary area 40 .

In the prior art, the organic film layer 22 is in direct contact with the first flat layer 11 on the side close to the dicing line 50 , and the adhesion is low; The height difference (thickness step difference) makes it easy to peel off between the first flat layer 11 and the organic film layer 22, and the organic film layer 22 is easy to fall off and other defects, such as film peeling at position A in Figure 3. The falling debris may also fall to the pixel color rendering area, resulting in poor color rendering dark spots. As shown in Figure 4, the shadows in the B1 area and B2 area are the falling debris falling to the pixel color rendering area, resulting in bad. In this embodiment, the cushion layer 31 is arranged between the organic film layer 22 at the cutting edge of the display panel 100 and the first flat layer 11, thereby reducing the step difference of the organic film layer 22 at the cutting edge. The flat layers 11 are connected by the cushion layer 31 , which improves the adhesion of the organic film layer 22 and effectively reduces the risk of the organic film layer 22 falling off, that is, the risk of OC Peeling occurring in the display panel 100 . It also prevents debris from overlapping in the cutting lane 50 or falling off to the cutting equipment before or during the cutting process, thereby effectively improving product yield and equipment productivity.

In order to facilitate the description and description of the overall concept of the present invention, in this embodiment, a large display panel 200 is used for description, and the display panel 100 can be referred to for understanding.

The cushion layer 31 may be a separate film structure; the cushion layer 31 may also be obtained by extending the structure of the display panel 100 during manufacture, thereby ensuring high manufacturing efficiency and reducing costs. For example, in some implementations, when preparing one or more structures in the display functional layer 10a, the one or more structures described in the display functional layer 10a may be extended toward the dicing line 50, extending to The edges are cut to form a cushion layer 31 to improve the adhesion of the organic film layer 22 . In other words, the edge of the display function layer 10 a extends toward the cutting line 50 , and the portion of the display function layer 10 a close to the cutting edge is used as the cushion layer 31 .

Further, the display function layer 10a includes: a second flat layer 12 (the second PLN layer), which is disposed on the side of the first flat layer 11 close to the touch panel 20; and a pixel definition layer 13 (PDL layer), which is disposed on the first flat layer 11. One side of the two flat layers 12 away from the first flat layer 11 . The touch panel 20 further includes an insulating buffer layer 21 disposed on the side of the pixel definition layer 13 away from the first flat layer 11 , that is, on the side of the organic film layer 22 close to the first flat layer 11 . The insulating buffer layer 21 includes a mesh insulating layer (metal mesh insulating layer) and a buffer layer (Barrier). During manufacture, one or more layers of the second planarization layer 12 , the pixel definition layer 13 and the insulating buffer layer 21 can be extended to the side close to the dicing line 50 , so that the portion extending to the boundary region 40 is used as the pad layer 31 .

In some implementations, the second flat layer 12 of the display functional layer 10a extends toward the cutting line 50 and extends to the cutting edge, and the portion of the second flat layer 12 close to the cutting edge is used as the cushion layer 31 , as shown in FIG. 5 . In this implementation manner, the pad layer 31 can be simultaneously formed during the process of forming the second flat layer 12 , no additional process is required, and the step difference of the organic film layer 22 in the boundary region 40 can be reduced.

For example, in a certain type of display panel, the thickness of the second flat layer 12 is 1.5um, the thickness of the pixel definition layer 13 is 1.5um, the thickness of the insulating buffer layer 21 is 0.5um, and the thickness of the organic film layer 22 is 2um . At this time, the level difference of the organic film layer 22 in the boundary region 40 reaches 3.5 μm. When the cushion layer 31 is formed in this way, the thickness of the cushion layer 31 is 1.5um, and the step difference of the organic film layer 22 in the boundary region 40 is 2um, which effectively reduces the step difference of the organic film layer 22 in the boundary region 40 and reduces the The risk of peeling off of the organic film layer 22 is avoided.

In some implementations, the pixel definition layer 13 of the display functional layer 10a extends toward the cutting line 50 and extends to the cutting edge, and the portion of the pixel definition layer 13 close to the cutting edge serves as the pad layer 31 , as shown in FIG. 6 . Likewise, in this implementation manner, the pad layer 31 can be simultaneously formed during the process of forming the pixel definition layer 13 , no additional process is required, and the level difference of the organic film layer 22 in the boundary region 40 can be reduced. Continuing to illustrate with the foregoing example, when the pad layer 31 is formed in this way, the thickness of the pad layer 31 is 3um, and the step difference of the organic film layer 22 in the boundary region 40 is 0.5um, which effectively reduces the thickness of the organic film layer 22. The step difference of the boundary region 40 reduces the peeling risk of the organic film layer 22 .

In some implementations, the insulating buffer layer 21 of the display functional layer 10 a is disposed on the side of the pixel definition layer 13 away from the first flat layer 11 , that is, the insulating buffer layer 21 is disposed on the organic film layer 22 close to the first flat layer 11 On one side, the insulating buffer layer 21 extends toward the dicing line 50 , and a pad layer 31 is formed between the organic film layer 22 and the first flat layer 11 , as shown in FIG. 7 . At this time, the cushion layer 31 is composed of only the insulating buffer layer 21 . Continuing to illustrate with the foregoing example, when the cushion layer 31 is formed in this way, the thickness of the cushion layer 31 can also reach 3.5um, and the step difference of the organic film layer 22 in the boundary region 40 is almost negligible. The boundary region 40 generates a step difference, which reduces the risk of peeling off of the organic film layer 22 .

In some implementations, the insulating buffer layer 21 of the display functional layer 10a and the pixel definition layer 13 of the touch panel 20 jointly extend toward the cutting line 50 and extend to the cutting edge, and the insulating buffer layer 21 and the pixel defining layer 13 are close to the cutting edge The parts are collectively used as the cushion layer 31 , as shown in FIG. 8 . At this time, the thickness of the pad layer 31 is the sum of the thicknesses of the insulating buffer layer 21 and the pixel definition layer 13 , which further reduces the step difference of the organic film layer 22 in the boundary region 40 and improves the adhesion of the organic film layer 22 . Continuing to illustrate with the foregoing example, when the cushion layer 31 is formed in this way, the thickness of the cushion layer 31 is 3.5um, and the step difference of the organic film layer 22 in the boundary region 40 is almost negligible, which avoids the organic film layer 22 in the boundary region. 40 produces a step difference, which reduces the peeling risk of the organic film layer 22 .

In some implementations, the pad layer 31 includes a patterned cell array 31a, the patterned cell array 31a includes a plurality of patterned cells, and each adjacent patterned cell in the patterned cell array 31a has a gap. These patterned cell arrays 31a can be separately fabricated on the first flat layer 11 as the pad layer 31, as shown in FIG. 9 . The patterned cell array 31a can also be fabricated between the display function layer 10a and the organic film layer 22 in the boundary region 40, and together with the extension 31b of the display function layer 10a, serve as the cushion layer 31, as shown in FIG. 10 . That is to say, when manufacturing the patterned cell array 31a, the patterned cell array 31a can be formed on the first flat layer 11, and can also be formed on the side of the display functional layer 10a in contact with the organic film layer 22, wherein FIG. 10 shows that the patterned cell array 31 a is formed on the side of the pixel definition layer 13 away from the first flat layer 11 . Other cases such as forming the patterned cell array 31a on the second planarization layer 12 and forming the patterned cell array 31a on the insulating buffer layer 21 are not shown.

The material of the patterned unit array 31a can be silicon nitride (SiN _x ), and the patterned unit array 31a has good adhesion with the organic film layer 22; at the same time, because the patterned unit array 31a further has The contact area of the organic film layer 22 is increased, and at the same time, the patterned cell array 31a also has good adhesion with other film layers, which effectively improves the adhesion with the organic film layer 22, and the patterned cell array 31a is also effective. The step difference between the position of the organic film layer 22 in the boundary region 40 is reduced, and the risk of peeling off of the organic film layer 22 is reduced.

Further, in some implementations, a complete insulating film can be used as the pad layer 31 to replace the above-mentioned patterned cell array 31a, which can also avoid the OC Peeling phenomenon. However, when the complete insulating film is used as the cushion layer 31, the tiny cracks generated when the MDL (Module, module) is cut will extend into the surface of the panel along the insulating film, resulting in package failure. When the patterned unit array 31a is used to replace the complete insulating film, even if tiny cracks are generated during MDL cutting, they will be blocked by the gap between the two patterned units, avoiding further lateral expansion of the cracks and effectively improving the The yield of the final product.

The type of the patterned unit array 31a is not limited, and may include one or more of the following: bar, polyline, square, circle, and so on. 11-12 show the top views of the strip-shaped patterned unit array 31a, FIGS. 13-14 show the top views of the zigzag-shaped patterned unit array 31a, and FIG. 15 shows the square patterned unit Top view of array 31a. In FIGS. 11-15, the dark color is the patterned cell array 31a, and the light color is the gap 31c between the patterned cells. In some implementations, a strip-shaped or zig-zag patterned cell array can be used to achieve higher process efficiency and at the same time ensure a better effect of preventing crack propagation.

It should be noted that the width of the cushion layer 31 may be different in different products. For example, in some products in which the organic film layer 22 completely covers the dicing lane 50 and the alignment area of the dicing lane 50, the cushion layer 31 can completely cover the dicing lane. 50 and border region 40, as shown in FIG. 16 . In some products in which the organic film layer 22 only covers the boundary region 40 and does not cover the scribe line 50 , the cushion layer 31 may also cover only the boundary region 40 . It should also be noted that the pad layer 31 can also be provided for the boundary area 40 on the side of the dummy pixel area (DummyPixel) of the display panel 100 to avoid the occurrence of the OC Peeling phenomenon. Repeat.

Based on the same inventive concept, another embodiment of the present invention further provides a display device, including the display panel 100 described in any one of the foregoing embodiments.

Based on the same inventive concept, an embodiment of the present invention also provides a method for manufacturing a display panel, including:

manufacturing a first flat layer of an array substrate; forming a display functional layer and a pad layer on the first flat layer; the pad layer is close to the dicing line; forming an organic film layer on the display functional layer and the pad layer, The edge region of the organic film layer close to the dicing lane is adhered to the first flat layer through the cushion layer.

It should be noted that the positions, structures and beneficial effects of the cushion layers formed in the various steps of the manufacturing method of the display panel provided in this embodiment have been described in the foregoing embodiments, and will not be repeated in this embodiment; , the specific implementation of other process steps not mentioned in the manufacturing method in this embodiment may be implemented with reference to the existing process method for manufacturing an OLED screen, and will not be repeated here.

In the above description, technical details such as patterning and etching of each layer are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not exactly the same as those described above. Additionally, although the various embodiments have been described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage.

Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the 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 (10)

1. A display panel, comprising: the touch control device comprises an array substrate, a touch control plate and a cushion layer;

the array substrate comprises a first flat layer and a display functional layer; the display function layer is disposed on the first planarization layer;

the touch panel comprises an organic film layer, and the organic film layer is arranged on one side of the display function layer, which is far away from the first flat layer;

the cushion layer is arranged between the first flat layer and the organic film layer and is close to the cutting edge of the display panel, and the cushion layer is used for adhering the first flat layer and the organic film layer.

2. The display panel of claim 1, wherein the display functional layer edge extends to the cut edge, and a portion of the display functional layer adjacent to the cut edge serves as the cushion layer.

3. The display panel of claim 2, wherein a second flat layer of the display functional layer extends to the cut edge, and a portion of the second flat layer near the cut edge serves as the cushion layer.

4. The display panel according to claim 2, wherein a pixel defining layer of the display function layer extends to the cut edge, and a portion of the pixel defining layer near the cut edge serves as the underlayer.

5. The display panel of claim 1, wherein the touch panel further comprises an insulating buffer layer disposed on a side of the organic film layer adjacent to the first planarization layer, the insulating buffer layer extending to the cut edge, and a portion of the insulating buffer layer adjacent to the cut edge serves as the cushion layer.

6. The display panel of claim 1, wherein the touch panel further comprises an insulating buffer layer disposed on a side of the organic film layer adjacent to the first planarization layer, wherein the insulating buffer layer and the pixel defining layer of the display function layer are coextensive to the cut edge, and wherein portions of the insulating buffer layer and the pixel defining layer adjacent to the cut edge are collectively the underlayer.

7. The display panel of any one of claims 1-6, wherein the blanket layer comprises an array of patterned cells comprising a plurality of patterned cells with a gap between each adjacent patterned cell.

8. The display panel of claim 7, wherein the graphical elements comprise any one or more of:

bar, dog-leg, square, and round.

9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.

10. A method of manufacturing a display panel, comprising:

manufacturing a first flat layer of the array substrate;

forming a display functional layer and a cushion layer on the first flat layer; the cushion layer is close to the cutting channel;

and forming an organic film layer on the display function layer and the cushion layer, wherein the organic film layer is adhered to the first flat layer through the cushion layer in the edge area close to the cutting channel.

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