CN110824762A

CN110824762A - Display panel and display device

Info

Publication number: CN110824762A
Application number: CN201911035310.6A
Authority: CN
Inventors: 赵永超
Original assignee: Shenzhen China Star Optoelectronics Technology Co Ltd
Current assignee: TCL China Star Optoelectronics Technology Co Ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-02-21

Abstract

The invention discloses a display panel, which comprises an array substrate and a counter substrate which are oppositely arranged, wherein the array substrate comprises a plurality of pixel units which are arranged in an array manner, each pixel unit comprises a plurality of sub-pixel units, and one side of the counter substrate, which faces the array substrate, is provided with a black matrix; the black matrix layer comprises at least one pixel opening, a blocking area and at least one communication opening, the pixel opening corresponds to the sub-pixel units one by one, the blocking area divides the pixel opening, the communication opening is arranged on the blocking area, and the pixel openings are communicated with one another through the communication opening; the display panel can realize the mutual communication of the pixel openings by arranging the communication openings, thereby overcoming the terrain barrier effect of the black matrix layer, further enabling the alignment liquid to cross the barrier effect of the barrier area, rapidly and uniformly flowing into the openings of other pixel areas and solving the problem of non-sticking of the alignment liquid.

Description

Display panel and display device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display panel and a display device including the display panel.

Background

The alignment film plays an important role in the liquid crystal panel, not only controls the quality of liquid crystal alignment, but also has a large influence on the reliability of the liquid crystal panel, and the coating condition of the alignment film affects the optical quality of the whole panel, and finally affects the viewing experience of customers.

As shown in fig. 1, a typical lcd panel includes an array substrate 10 and a color filter substrate 20 disposed opposite to each other. The array substrate 10 includes a first substrate 11, a TFT layer 12 disposed on a side of the first substrate 11 facing the color filter substrate 20, and a first alignment film layer 13 disposed on a side of the TFT layer 12 facing the color filter substrate 20. The color filter substrate 20 includes a second substrate 21, a color filter layer 22 disposed on the second substrate 21, and a second alignment film 23 disposed on the color filter layer 22 and covering the color filter layer 22. The filter layer 22 includes a plurality of color resist blocks 221 and a plurality of black matrixes 222, wherein the color resist blocks 221 and the black matrixes 222 are arranged at intervals.

As shown in fig. 2, on the color filter substrate 20 side, due to the adjacent interval arrangement of the black matrix 222 on the color filter layer 23 and the color resist block 221, the topography on the color filter substrate 20 side is flat, and the flowability of the alignment liquid 50 is not blocked, so that a uniform alignment film can be formed.

However, in the COA type display panel, since only the black matrix layer is provided, the color filter substrate may form a concave-convex topography (or a concave-convex topography) having a certain height, which may affect the uniformity of the flow of the alignment liquid, and may eventually cause the problem of non-sticking of the alignment liquid.

Especially, as the resolution is higher and higher, the design of the display panel is more and more complex, which causes a larger topographic difference of the substrate and a larger influence on the fluidity of the alignment liquid, and finally causes uneven film thickness of the alignment liquid or non-sticking of the alignment liquid, so that the display effect of the display panel is reduced.

When the resolution of the display panel is high, the pixel opening pitch of the Black Matrix (BM) layer becomes small. The nozzle space of the existing alignment film coating machine can not ensure that alignment liquid is dripped into each pixel opening. Due to the blocking effect of the black matrix layer topography, the alignment liquid cannot cross the blocking region, so that no alignment liquid exists in part of the pixel openings, and finally the alignment liquid is prevented from being stuck in the region, and a bright spot is generated.

Therefore, it is desirable to provide a display panel and a display device to solve the above problems.

Disclosure of Invention

The present invention is directed to the above-mentioned problems, and provides a display panel and a display device including the display panel, in which the display panel has communication openings on a black matrix layer, so that pixel openings of the black matrix layer are communicated with each other, thereby solving the problem of blocking alignment liquid by the black matrix layer, and enabling the alignment liquid to rapidly and uniformly flow to each pixel opening.

In order to achieve the above purpose, the display panel of the present invention adopts the following technical solutions.

A display panel comprises an array substrate and a counter substrate which are oppositely arranged, wherein the array substrate comprises a plurality of pixel units which are arranged in an array mode, each pixel unit comprises a plurality of sub-pixel units, a black matrix layer is arranged on one side, facing the array substrate, of the counter substrate, and the black matrix layer comprises: a plurality of pixel openings, each pixel opening corresponding to one of the sub-pixel units; a blocking region dividing the pixel opening; and at least one communication opening, wherein the communication opening is arranged on the blocking area, and the pixel openings are mutually communicated through the communication opening.

Further, the width range of the communication opening is 1-3 mu m.

Further, the communication opening includes a first communication opening extending in a first direction and a second communication opening extending in a second direction; wherein the first direction and the second direction are perpendicular to each other.

Further, the pitch of adjacent pixel openings is less than 98 μm.

Furthermore, each pixel unit comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit; the pixel openings comprise a first pixel opening, a second pixel opening and a third pixel opening which respectively correspond to the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit.

Further, the array substrate further comprises a protective layer, and the protective layer is arranged on the sub-pixel units and covers the sub-pixel units and the array substrate.

Further, the array substrate further comprises a first alignment film, and the first alignment film is arranged on the protective layer and covers the protective layer.

Further, the opposite substrate further comprises a second alignment film, and the second alignment film is arranged on the black matrix and covers the black matrix and the opposite substrate.

Further, the display panel further includes: and the liquid crystal layer is arranged between the array substrate and the opposite substrate and is contacted with the first alignment film and the second alignment film.

The invention also provides a display device which comprises any one of the display panels.

The display panel and the display device have the beneficial effects that:

(1) according to the display panel, the communicated openings are arranged, so that the mutual communication of the pixel openings on the black matrix layer can be realized, the terrain blocking effect of the black matrix layer can be overcome, the blocking effect of the alignment liquid crossing the black matrix layer can be further realized, the alignment liquid can rapidly and uniformly flow into other pixel openings, and the problem that an alignment film is not sticky is solved;

(2) the display panel can overcome the limitation and restriction of the distance between the nozzles of the conventional alignment liquid on the film forming uniformity of the alignment film, and improve the yield of products.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a general display panel.

Fig. 2 is a schematic diagram of a dropping process of a color film substrate side alignment liquid of a general display panel.

Fig. 3 is a schematic structural diagram of the display panel according to the present invention.

Fig. 4 is a top view of a conventional black matrix layer.

FIG. 5 is a schematic diagram of the dropping process of the alignment liquid when the conventional black matrix layer in FIG. 4 is used in the display panel.

Fig. 6 is a top view of a black matrix layer in a display panel according to the present invention.

Fig. 7 is a schematic view of an alignment liquid dropping process of a display panel using the black matrix layer shown in fig. 6.

Detailed Description

The technical solution 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. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In this patent document, the drawings discussed below and the embodiments used to describe the principles of the present disclosure are by way of illustration only and should not be construed in any way to limit the scope of the present disclosure. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged system. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Further, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.

The terms used in the description of the present invention are only used to describe specific embodiments, and are not intended to show the concept of the present invention. Unless the context clearly dictates otherwise, expressions used in the singular form encompass expressions in the plural form. In the present specification, it is to be understood that terms such as "comprising," "having," and "containing" are intended to specify the presence of stated features, integers, steps, acts, or combinations thereof, as taught in the present specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, or combinations thereof. Like reference symbols in the various drawings indicate like elements.

Fig. 3 is a schematic structural diagram of the display panel according to the present invention. As shown in fig. 3, the display panel of the present invention includes an array substrate 10 and an opposite substrate 20 which are oppositely disposed. The array substrate 10 includes a plurality of pixel units arranged in an array, each pixel unit includes a plurality of sub-pixel units 12, and a black matrix layer 22 is disposed on a side of the opposite substrate 20 facing the array substrate 10.

Referring to fig. 3, a first alignment film 14 is disposed on the array substrate 10, and a second alignment film 23 is disposed on the opposite substrate 20. Specifically, the first alignment film 14 is located on a side of the array substrate 10 facing the opposite substrate 20 and covers the array substrate 10; the second alignment film 23 is disposed on the black matrix layer 22 and covers the black matrix layer 22 and the opposite substrate 20. The first alignment film 14 and the second alignment film 23 are formed by dropping an alignment liquid 50 on the array substrate 10 and the black matrix layer 22.

It can be seen that the topography of the array substrate 10 and the counter substrate 20 may affect the fluidity of the alignment liquid 50, and further may affect the forming effect and the film forming uniformity of the first alignment film 14 and the second alignment film 23, and finally may affect the display effect of the display panel. Particularly, in the second alignment film 23 on the counter substrate 10 side, the topographic structure of the black matrix layer 22 can directly affect the fluidity of the alignment liquid 50.

For example, in the COA type display panel, since only one black matrix layer 22 is provided on the counter substrate 20 side, the influence of the topographic structure of the black matrix layer 22 on the forming effect of the second alignment film 23 is more significant and prominent.

Fig. 4 is a top view of a conventional black matrix layer. As shown in fig. 4, the conventional black matrix layer 22 ' includes a plurality of pixel openings 221 ' and a plurality of blocking regions 222 '. Wherein each of the pixel openings 221' corresponds to one of the sub-pixel units 12. The blocking region 222 ' surrounds the periphery of the pixel opening 221 ' to divide the pixel opening 221 '. In this embodiment, the pixel openings 221' are uniform in size and shape and are arranged in an array.

FIG. 5 is a schematic diagram of the dropping process of the alignment liquid when the conventional black matrix layer in FIG. 4 is used in the display panel. When the conventional black matrix 22 'structure is applied to the display panel, referring to fig. 5, since only the black matrix layer 22' is disposed on the opposite substrate 20 side, and since the barrier region 222 'of the black matrix layer 22' has a certain height, the flow of the alignment liquid 50 is affected, the problem of non-sticking of the alignment liquid 50 is easily generated, and the uniformity of the film formation of the second alignment film 23 is affected.

Referring to fig. 5, especially when the resolution of the display panel is higher, the pitch between the adjacent pixel openings 221 'of the black matrix layer 22' becomes smaller. Alternatively, the width of the blocking region 222' may be reduced. However, the current newest alignment liquid nozzle pitch value is 98 μm, and when the pitch between adjacent pixel openings 221 'is smaller than 98 μm, it cannot be guaranteed that the alignment liquid 50 is dropped into each pixel opening 221'. At this time, the blocking effect of the topography of the black matrix layer 22 ' is more obvious, and it is easier to cause that the alignment liquid 50 cannot cross the blocking region 222 ', so that there is no alignment liquid 50 in a portion of the pixel openings 221 ', and finally, the alignment liquid non-sticking problem is generated in the region, and a bright spot is generated.

Fig. 6 is a top view of a black matrix layer in a display panel according to the present invention. As shown in fig. 6, in order to solve the above problem, the applicant proposed a black matrix layer 22 structure. The black matrix layer 22 of the present invention includes a pixel opening 221, a blocking region 222, and a communication opening 223. Each of the pixel openings 221 corresponds to one of the sub-pixel units 12. The blocking region 222 is located at the periphery of the pixel opening 221, and is used for dividing the pixel opening 221. The communication openings 223 are located on the blocking region 222, and the pixel openings 221 communicate with each other through the communication openings 223.

Fig. 7 is a schematic view of an alignment liquid dropping process of a display panel using the black matrix layer shown in fig. 6. As shown in fig. 7, in the display panel of the present invention, the communication opening 223 is disposed on the black matrix layer 22, so that the pixel openings 221 of the black matrix layer 22 can be communicated with each other, and the alignment liquid 50 can overcome the blocking effect of the terrain of the blocking region 222, and rapidly and uniformly flow into the other pixel region openings 221, thereby solving the problem of PI non-sticking. Meanwhile, by disposing the communication opening 223 on the blocking region 222, the light shielding effect of the black matrix layer 22 can be secured.

With continued reference to fig. 6, in the present embodiment, the pixel openings 221 are rectangular, and the pixel openings 221 are arranged in an equally spaced array in the horizontal and vertical directions. The communication openings 223 include first communication openings 2231 extending along a first direction X and second communication openings 2232 extending along a second direction Y; wherein the first direction X and the second direction Y are perpendicular to each other. Specifically, each of the pixel openings 221 communicates with another pixel opening 221 adjacent to the pixel opening 221 in the first direction X or the second direction Y through a first communicating opening 2231 or a second communicating opening 2232, respectively.

With continued reference to fig. 7, after the alignment liquid 50 is dropped into one of the pixel openings 221, the alignment liquid 50 can flow into the adjacent pixel openings 221 along the direction of the arrow, and then flow into the adjacent first communication openings 2231 and the adjacent second communication openings 2232.

It should be noted that the size, shape and arrangement of the pixel openings 221 and the communicating openings 222 on the black matrix layer 221 can be adjusted according to the design requirement, so as to improve the flowability and uniformity of the alignment liquid 50.

Specifically, the pitch of adjacent opening regions 22 is less than 98 μm. The width of the communication opening 223 is in the range of 1-3 μm. The communication of the opening areas 22 can be realized by providing the communication openings 223, and the flow uniformity of PI is improved. Meanwhile, the communication opening 223 is disposed on the blocking region 222, and the width of the communication opening 223 is limited within a small range, which can also ensure the light shielding effect of the black matrix layer 22.

In one embodiment, the black matrix layer 22 can be made of acrylic black photoresist. The communication opening 223 can be realized by using a half tone or gray tone mask.

In specific implementation, the alignment liquid 50 for forming the second alignment film 23 and the first alignment film 14 can be made of Polyimide (Polyimide), which is a commonly used alignment film material.

Referring to fig. 3, the array substrate 10 includes a first substrate 11, a plurality of pixel units, a protective layer 13, and a first alignment film 14.

In implementation, the first substrate 11 may be formed of a suitable material such as a glass material, quartz, a metal material, or a plastic material including polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide, or the like.

As shown in fig. 3, the pixel unit includes a plurality of sub-pixel units 12, and the sub-pixel units 12 are arranged in an array on a side of the first substrate 11 facing the opposite substrate 10. Each pixel unit includes a red sub-pixel unit 121, a green sub-pixel unit 122, and a blue sub-pixel unit 123. Accordingly, the pixel openings 221 include a first pixel opening 2211, a second pixel opening 2212 and a third pixel opening 2213 respectively corresponding to the red sub-pixel unit 121, the green sub-pixel unit 122 and the blue sub-pixel unit 123.

With continued reference to fig. 1, each of the sub-pixel units 12 includes a TFT layer and a color block of a corresponding color disposed on the TFT layer. The TFT layer is located on a side of the first substrate 11 facing the opposite substrate 20. The TFT layer comprises a plurality of TFTs arranged in an array, and the TFTs can play a role in driving and switching. The TFT includes a gate electrode, a gate insulating layer disposed on the gate electrode, an active layer disposed on the gate insulating layer, and a source electrode and a drain electrode disposed on the active layer.

In implementation, the gate electrode, the source electrode, and the drain electrode may be formed of a single material layer or a composite material layer including at least one material of aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W), and copper (Cu), or other suitable alloys, in consideration of conductivity. The active layer is made of one of amorphous silicon semiconductor, low-temperature polycrystalline silicon semiconductor and metal oxide semiconductor.

With continued reference to fig. 1, the color block is located on a side of the TFT layer facing the opposite substrate 20. In this embodiment, each color-resisting block corresponds to one TFT, and each color-resisting block corresponds to one pixel opening 221.

With reference to fig. 1, the color-resisting blocks include a red color-resisting block, a green color-resisting block and a blue color-resisting block. In this embodiment, the thickness of the blue color block is greater than the thickness of the red color block and the green color block, and the thickness of the red color block is the same as that of the green color block. In practice, the color block material is typically an organic material, such as a negative photoresist.

As shown in fig. 3, the protective layer 13 is located on the sub-pixel unit 12 and covers the sub-pixel unit 12 and the first substrate 11. In specific implementation, the protective layer 13 can be formed by a single layer or a multi-layer stack of suitable organic materials such as PET, PEN, polyacrylate and/or polyimide, or inorganic materials such as silicon oxide, silicon nitride, or a combination of the two.

As shown in fig. 3, the display panel further includes a liquid crystal layer 30 and at least one spacer 40. Wherein the liquid crystal layer 30 is disposed between the array substrate 10 and the opposite substrate 20. Specifically, the liquid crystal layer 30 is located between the first alignment film 14 and the second alignment film 23 and contacts the first alignment film 14 and the second alignment film 23.

As shown in fig. 1, the spacer 40 penetrates the liquid crystal layer 30, and both ends of the spacer 40 abut against the first alignment film 14 and the second alignment film 23, respectively. By providing the spacers 40, the gap between the array substrate 10 and the counter substrate 20 can be further maintained, and the cell forming distance of the display panel can be secured.

In specific implementation, the spacer layer 40 may be an organic film layer, or may be made of a photosensitive material such as photoresist.

According to the display panel, the communicated openings 223 are formed in the black matrix layer 22, so that the pixel openings 221 are communicated with each other, the alignment liquid 50 can cross the blocking effect of the blocking area 222 and rapidly and uniformly flow into other pixel openings 221, and the problem that the alignment liquid is not sticky is solved; the display panel can overcome the limitation and influence of the distance between the nozzles of the conventional alignment liquid on the film forming uniformity of the alignment film, and improve the yield of products.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a display panel, includes an array base plate and a opposition base plate that relative setting set up, the array base plate includes a plurality of pixel unit that the array was arranged, each pixel unit includes a plurality of sub-pixel unit, the opposition base plate orientation array base plate one side is provided with a black matrix layer, its characterized in that, the black matrix layer includes:

a plurality of pixel openings, each pixel opening corresponding to one of the sub-pixel units;

a blocking region dividing the pixel opening; and the number of the first and second groups,

at least one communicating opening, the communicating opening is arranged on the blocking area, and the pixel openings are communicated with each other through the communicating opening.

2. The display panel according to claim 1, wherein the width of the communication opening is in a range of 1 to 3 μm.

3. The display panel according to claim 1, wherein the communication opening includes a first communication opening extending in a first direction and a second communication opening extending in a second direction; wherein the first direction and the second direction are perpendicular to each other.

4. The display panel of claim 1, wherein a pitch of adjacent pixel openings is less than 98 μm.

5. The display panel of claim 1, wherein each of the pixel units comprises a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit; the pixel openings comprise a first pixel opening, a second pixel opening and a third pixel opening which respectively correspond to the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit.

6. The display panel of claim 1, wherein the array substrate further comprises a protective layer disposed on the sub-pixel units and covering the sub-pixel units and the array substrate.

7. The display panel of claim 6, wherein the array substrate further comprises a first alignment film disposed on and covering the protection layer.

8. The display panel of claim 7, wherein the opposite substrate further comprises a second alignment film disposed on the black matrix and covering the black matrix and the opposite substrate.

9. The display panel according to claim 8, characterized in that the display panel further comprises: and the liquid crystal layer is arranged between the array substrate and the opposite substrate and is contacted with the first alignment film and the second alignment film.

10. A display device characterized in that it comprises a display panel according to any one of claims 1 to 9.