CN111679489A

CN111679489A - Curved surface display panel, preparation method thereof and display device

Info

Publication number: CN111679489A
Application number: CN202010622178.5A
Authority: CN
Inventors: 陈丽虹; 吴玲; 沈柏平
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-09-18
Anticipated expiration: 2040-06-30
Also published as: CN111679489B

Abstract

The embodiment of the application provides a curved surface display panel, a preparation method thereof and a display device, wherein the preparation method comprises the steps of preparing a flat display panel, and preparing the curved surface display panel by bending along a first direction; the first edge and the second edge of the pixel electrode in the flat display panel are arranged along a third direction; the first signal lines are arranged along the third direction; the orthographic projection of the first signal line on the substrate base plate is positioned between the orthographic projections of the adjacent pixel electrodes on the substrate base plate; the orthographic projection of the black matrix on the substrate base plate covers the first signal line and the orthographic projection of the first edge on the substrate base plate, in the process of preparing the curved-surface display panel by the flat display panel, the first signal line moves towards the second direction relative to the corresponding black matrix, and the third direction is perpendicular to the thickness direction of the flat display panel and is parallel to the second direction after being bent along the first direction. In the curved surface display panel, the preparation method thereof and the display device provided by the embodiment of the application, the transmittance stability is high and the light leakage risk is low.

Description

Curved surface display panel, preparation method thereof and display device

[ technical field ] A method for producing a semiconductor device

The application relates to the technical field of display, in particular to a curved surface display panel, a preparation method of the curved surface display panel and a display device.

[ background of the invention ]

Curved display panels are receiving more and more attention with their elegant appearance, realistic picture and comfortable human eye experience. The existing mainstream display panel is still a liquid crystal display panel, and the liquid crystal display panel comprises a color film substrate and an array substrate which are arranged oppositely, wherein a black matrix is arranged on the color film substrate, a signal line is arranged on the array substrate, and the projection of the black matrix on the array substrate covers the signal line so as to avoid the signal line from influencing normal display. However, in the process of preparing the curved-surface display panel, a dislocation exists between the black matrix and the signal lines, and when the signal lines enter the display area, light leakage is generated, so that abnormal display is caused; meanwhile, the controllability of the transmittance of the display panel is poor due to the black domain change at the edge of the pixel electrode.

[ application contents ]

In view of the above, embodiments of the present application provide a curved display panel, a manufacturing method thereof, and a display device to solve the above problems.

In a first aspect, an embodiment of the present application provides a curved display panel, which includes a color film substrate and an array substrate that are disposed opposite to each other. The color film substrate comprises black matrixes, and hollow parts are arranged among the black matrixes; the array substrate comprises a substrate, a pixel electrode layer and a signal line layer, wherein the pixel electrode layer and the signal line layer are arranged on one side, facing the color film substrate, of the substrate, the pixel electrode layer comprises a plurality of pixel electrodes which are arranged in one-to-one correspondence to the hollow parts, the pixel electrodes comprise a first edge and a second edge which are oppositely arranged along a first direction, and the signal line layer comprises a plurality of first signal lines which are distributed along the first direction; the first direction is parallel to the bending direction of the curved display panel; the orthographic projection of the first signal line on the substrate base plate is positioned between the orthographic projections of the adjacent pixel electrodes on the substrate base plate; the orthographic projection of the black matrix on the substrate base plate covers the orthographic projection of the first signal line on the substrate base plate, and covers the orthographic projection of at least one of the first edge and the second edge on the substrate base plate.

In a second aspect, an embodiment of the present application provides a display device, including the curved display panel and the backlight module provided in the first aspect.

In a third aspect, an embodiment of the present application provides a method for manufacturing a curved display panel, where the method is used to manufacture the curved display panel provided in the first aspect, and the method includes: attaching a color film substrate and an array substrate which are oppositely arranged to prepare a planar display panel; and bending the flat display panel along the first direction to prepare a curved display panel. In the planar display panel, a color film substrate comprises black matrixes, and a plurality of hollow parts are arranged among the black matrixes; the array substrate comprises a substrate, a pixel electrode layer and a signal line layer, wherein the pixel electrode layer and the signal line layer are arranged on one side of the substrate, which faces the color film substrate; the pixel electrode layer comprises a plurality of pixel electrodes and the pixel electrodes comprise a first edge and a second edge which are arranged along a third direction; the signal line layer comprises a plurality of first signal lines arranged along a third direction; wherein, the orthographic projection of the first signal line on the substrate base plate is positioned between the orthographic projections of the adjacent pixel electrodes on the substrate base plate; the orthographic projection of the black matrix on the substrate base plate covers the orthographic projection of the first signal line on the substrate base plate, and covers the orthographic projection of the first edge on the substrate base plate; in the process of preparing the curved-surface display panel by the flat display panel, the first signal line moves towards the second direction relative to the corresponding black matrix, and the third direction is vertical to the thickness direction of the flat display panel and is parallel to the second direction after being bent along the first direction.

In the curved display panel, the preparation method thereof and the display device provided by the embodiment of the application, in the planar display panel, the orthographic projection of the black matrix on the substrate covers the orthographic projection of the first edge of the pixel electrode on the substrate, that is, the orthographic projection of the black matrix on the substrate covers the partial width of the pixel electrode close to the first edge. In the process of changing the flat display panel into the curved display panel, even if the pixel electrode shifts towards the second direction relative to the black matrix on the side where the first edge of the pixel electrode is located, the first edge can be ensured to be still covered by the black matrix by covering the width of the part, close to the first edge, of the pixel electrode through the reasonably designed black matrix, the influence of a black domain on the stability of transmittance is avoided, meanwhile, the first signal line adjacent to the first edge can be ensured to be still covered by the black matrix, and light leakage is avoided.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 view of a curved display panel according to an embodiment of the present disclosure;

FIG. 2 is a perspective view of the curved display panel shown in FIG. 1;

fig. 3 is a schematic view of another curved display panel provided in the embodiment of the present application;

fig. 4 is a schematic diagram of a display device according to an embodiment of the present disclosure;

fig. 5 is a schematic view of another display device provided in an embodiment of the present application;

fig. 6 is a schematic view illustrating a manufacturing method of a curved display panel according to an embodiment of the present disclosure;

FIG. 7 is a schematic plan view of a flat display panel in the manufacturing method shown in FIG. 6;

fig. 8 is a projection view of the curved display panel in the manufacturing method shown in fig. 6.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. 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 application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description herein, it is to be understood that the terms "substantially", "approximately", "about", "substantially", and the like, as used in the claims and the examples herein, are intended to be generally accepted as not being precise, within the scope of reasonable process operation or tolerance.

It should be understood that although the terms first, second, etc. may be used to describe the black matrix, etc. in the embodiments of the present application, the black matrix should not be limited to these terms. These terms are only used to distinguish the black matrices from each other. For example, the first black matrix may also be referred to as a second black matrix, and similarly, the second black matrix may also be referred to as a first black matrix, without departing from the scope of the embodiments of the present application.

The applicant provides a solution to the problems of the prior art through intensive research.

Fig. 1 is a schematic view of a curved display panel according to an embodiment of the present disclosure, and fig. 2 is a projection view of the curved display panel shown in fig. 1.

As shown in fig. 1, the curved display panel provided in the embodiment of the present application includes a color filter substrate 10 and an array substrate 20, which are disposed opposite to each other. The curved display panel provided in the embodiment of the present application may be a liquid crystal display panel, and a liquid crystal layer (not shown) is further included between the array substrate 20 and the color film substrate 10.

The color filter substrate 10 includes an upper substrate 11, and a black matrix 12 and a color resistor (not shown) disposed on one side of the upper substrate 11 facing the array substrate 20, where a plurality of hollow portions are included between the black matrices 12 to expose the color resistor, the liquid crystal layer controls a portion of light incident on the color filter substrate 10 to be changed into light having a certain color through the color resistor, and the portion of light is shielded by the black matrix 12 to avoid optical crosstalk between adjacent pixels.

The array substrate 20 includes a substrate 21, a pixel electrode layer and a signal line layer disposed on one side of the substrate 21 facing the color filter substrate 10. The signal line layer includes a plurality of first signal lines 22 arranged along a first direction X, the pixel electrode layer includes a plurality of pixel electrodes 23 arranged in one-to-one correspondence with the hollow portions, and an orthographic projection of the first signal line 22 on the substrate base 21 is located between orthographic projections of adjacent pixel electrodes 23 arranged along the first direction X on the substrate base 21. The first direction X is parallel to the bending direction of the curved display panel. The signal line 22 may be any one of a data line, a gate line, and the like.

As shown in fig. 1 and 2, the pixel electrode 23 includes a first edge 231 and a second edge 232 disposed oppositely along the first direction X, and an orthogonal projection of the black matrix 12 on the substrate 21 covers an orthogonal projection of the first signal line 22 on the substrate 21, and covers an orthogonal projection of at least one of the first edge 231 and the second edge 232 on the substrate 21. In one embodiment of the present application, as shown in fig. 1 and 2, the orthographic projection of the black matrix on the substrate base plate 21 covers both the first edge 231 and the second edge 232.

The first edge 231 and/or the second edge 232 of the pixel electrode 23 in the curved display panel are/is arranged below the black matrix 12, so that the first signal line 22 is ensured to be also positioned below the black matrix 12, and the problem of light leakage is avoided; in addition, the first edge 231 and/or the second edge 232 of the pixel electrode 23 are hidden under the black matrix 12, so that the black domains near the first edge 231 and/or the second edge 232 are substantially under the black matrix 12, and the influence of the black domains on the display transmittance fluctuation is avoided.

The curved display panel is formed by preparing a flat display panel, and bending the flat display panel to form the curved display panel, wherein the black matrix 12, the first signal line 22 and the pixel electrode 23 are located on different substrates, so that the black matrix 12, the first signal line 22 and the pixel electrode 23 are offset in the process of bending the flat display panel. When the flat display panel is formed into a curved display panel in a final form in the second direction Y, the first signal lines 22 and the pixel electrodes 23 are shifted from the black matrix 12. It is understood that the second direction Y is a moving direction of the center line of the first signal line 22 with respect to the center line of the black matrix 12 covering it in the process of forming the flat display panel into the curved display panel. As shown in fig. 1, when the convex direction of the curved display panel is oriented toward the array substrate 20, the first signal lines 22 and the pixel electrodes 23 are shifted to the lower right with respect to the black matrix 12 in the portion of the display panel on the left side of the bending line MN; in the portion of the display panel to the right of the bend line MN, the first signal lines 22 and the pixel electrodes 23 are offset to the lower left with respect to the black matrix 12, i.e., the second direction Y is parallel to the first direction X and is directed to the bend line MN from the edge of the display panel. It can be understood that, when the protruding direction of the curved display panel faces the color filter substrate 10, the second direction is opposite to the second direction Y shown in fig. 1.

As shown in fig. 1, the second edge 232 is disposed in the second direction Y of the first edge 231, and the orthographic projection of the black matrix 12 on the pixel electrode layer covers the first edge 231 of the pixel electrode 23.

Specifically, taking the curved display panel shown in fig. 1 as an example, when the second edge 232b of one pixel electrode 23b in the portion of the curved display panel on the left side of the bend line MN is located at the lower right side shown in the second direction Y with respect to the first edge 231b, in the process of forming the curved display panel, the first edge 231b of the pixel electrode 23b and the first signal line 22 adjacent to the first edge 231b are shifted to the lower right side shown in the second direction Y with respect to the black matrix 12b, and the first edge 231b is covered by defining the orthographic projection of the black matrix 12b on the pixel electrode layer, so as to reduce the black domain of the display area, and at the same time, ensure that the first signal line 22 below the black matrix 12b is not shifted to the area not covered by the black matrix 12b, and avoid light leakage in the left side area of the bend line MN; the second edge 232a of one pixel electrode 23a in the portion of the curved display panel to the right of the bend line MN is located at the lower left side shown by the second direction Y relative to the first edge 231a, and in the process of forming the curved display panel, the first edge 231a of the pixel electrode 23a and the first signal line 22 adjacent to the first edge 231a are shifted to the lower left side shown by the second direction Y relative to the black matrix 12a, so that the first edge 231a is covered by defining the positive projection of the black matrix 12a on the pixel electrode layer, thereby reducing the black domain of the display area, and ensuring that the first signal line 22 below the black matrix 12a is not shifted to the area not covered by the black matrix 12a, thereby avoiding the light leakage area to the right side of the bend line MN.

As shown in fig. 2, the pixel electrode 23 includes a first branch electrode 23 'and a second branch electrode 23 ″ arranged along the first direction X, and further includes a slit 230 between the branch electrodes, where an edge of the first branch electrode 23' close to the black matrix 12 is a first edge 231, and an edge of the second branch electrode 23 ″ close to the black matrix 12 is a second edge 232. The width of the first branch electrode 23' is d1, the orthographic projection of the black matrix 12 on the substrate base plate 21 covers the first edge 231, and the minimum distance between the first edge 231 and the edge of the black matrix 12 covering the first edge 231, which is close to the pixel electrode 23, is d2, wherein d1 is larger than or equal to d2 is larger than or equal to 0.5d 1. In one embodiment of the present application, 2 um. gtoreq. d 2. gtoreq.0.5 um. The inventors have found that when d2 satisfies the above width range, the first signal line 22 adjacent to the pixel electrode 23 can be always positioned below the black matrix 12, and the black domain at the edge of the pixel electrode 23 can be substantially completely hidden below the black matrix 12.

With reference to fig. 2, in the correspondingly disposed first branch electrode 23 ' and the black matrix 12, a distance between an edge of the black matrix 12 far away from the first branch electrode 23 ' and the first edge 231 of the first branch electrode 23 ' is d3, and d3 is greater than or equal to 8 μm. That is, as shown in fig. 2, in the black matrix 12 positioned on the left side and the first branch electrode 23 'positioned on the left side, the distance between the edge on the left side of the black matrix 12 and the first edge 231 of the first branch electrode 23' is greater than 8 μm.

With reference to FIG. 2, in the second branch electrode 23 ″ and the black matrix 12, the distance between the edge of the black matrix 12 far away from the second branch electrode 23 ″ and the second edge 232 of the second branch electrode 23 ″ is d4, and d4 ≧ 8 μm. That is, as shown in fig. 2, in the black matrix 12 located on the right side and the second branch electrode 23 ″ located on the right side, the distance between the edge on the right side of the black matrix 12 and the second edge 232 of the second branch electrode 23 ″ is greater than 8 μm.

The distances between the first edge 231 and the second edge 232 of the pixel electrode 23 and the outer edge of the adjacent black matrix 12 are greater than 8 μm, so that the problem of color shift can be effectively avoided.

In an embodiment of the present application, please continue to refer to fig. 1, the curved display panel includes a first region a1 and a second region a2, the first region a1 and the second region a2 are symmetric about a bending line MN, the bending line MN is perpendicular to the first direction X, and the black matrix 12a located in the first region a1 and the black matrix 12b located in the second region a2 are symmetric about the bending line MN.

Fig. 3 is a schematic view of another curved display panel according to an embodiment of the present disclosure.

In one embodiment of the present application, as shown in fig. 3, the curved display panel includes regions having different curvature of curvature. The black matrix comprises a first black matrix 12c and a second black matrix 12d which are arranged along the first direction X, wherein the bending curvature of the curved display panel corresponding to the area where the first black matrix 12c is located is larger than that of the curved display panel corresponding to the area where the second black matrix 12d is located, and then the width of the first black matrix 12c is larger than that of the second black matrix 12 d. In the curved display panel, the shift distance between the pixel electrode 23 and the first signal line 22 in the region with the larger curvature and the black matrix 12 is larger, so that the black matrix 12 should be designed to be wider in order to avoid the first edge 231 or the first signal line 22 shifting to the region not covered by the black matrix 12 due to the larger shift distance in the process of bending the flat display panel into the curved display panel. While the width of the black matrix 12 in the region where the bending curvature is small is designed to be smaller to improve the transmittance.

Fig. 4 is a schematic view of a display device provided in an embodiment of the present application, and fig. 5 is a schematic view of another display device provided in the embodiment of the present application. As shown in fig. 4, the display device provided in this application includes the curved display panel 01 provided in any one of the above embodiments and the backlight module 02 located on the backlight side of the display panel 01, where the backlight module 02 can provide backlight for the display panel. The backlight module 02 may be configured in the same direction as the curved display panel 01. The display panel provided by the embodiment of the application has the advantages of no light leakage problem and high light transmittance stability.

As shown in fig. 5, the display device according to the embodiment of the present invention includes a curved display panel 01, and thus can provide a driver with a special front viewing angle as an in-vehicle display device 001. The display device provided in the embodiment of the present application is not limited to the in-vehicle display device 001, and may be a curved display device for other application scenarios.

The embodiment of the application further provides a preparation method of the curved display panel, which is used for preparing the curved display panel provided by any one of the above embodiments.

Fig. 6 is a schematic view of a manufacturing method of a curved display panel according to an embodiment of the present application. In an embodiment of the present application, as shown in fig. 6, the manufacturing method includes a first step S1 of attaching a color film substrate 10 and an array substrate 20 that are oppositely disposed, and manufacturing a flat display panel; the second section S2 bends the flat display panel in the first direction X to prepare a curved display panel.

FIG. 7 is a schematic plan view of the flat display panel manufactured by the method shown in FIG. 6. Referring to fig. 6 and 7, the color filter substrate 10 includes an upper substrate 11 and black matrixes 12 disposed on a side of the upper substrate 11 facing the array substrate 20, and a plurality of hollow portions are disposed between the black matrixes 12. With reference to fig. 6 and fig. 7, the array substrate 20 includes a substrate 21, a pixel electrode layer and a signal line layer disposed on a side of the substrate 21 facing the color filter substrate 10. The pixel electrode layer includes a plurality of pixel electrodes 23 and the signal line layer includes a plurality of first signal lines 22 arranged along the third direction Z; the third direction Z is perpendicular to the thickness direction of the flat display panel. As shown in fig. 6 and 7, the orthographic projection of the first signal line 22 on the base substrate 21 is located between the orthographic projections of the adjacent pixel electrodes 23 on the base substrate 21, and the orthographic projection of the black matrix 12 on the base substrate 21 covers the orthographic projection of the first signal line 22 on the base substrate 21.

Referring to fig. 6, in the process of changing the flat display panel into the curved display panel, the first signal lines 22 and the pixel electrodes 23 are shifted with respect to the black matrix 12, and the shifting direction is defined as a second direction Y, which is the moving direction of the center lines of the first signal lines 22 with respect to the center lines of the black matrix 12 covering the same. As shown in fig. 6, the third direction Z of the flat display panel is curved along the first direction X to be the second reverse direction Y of the curved display panel.

Taking the manufacturing process shown in fig. 6 as an example, the flat display panel is convexly bent along the bending line MN toward the array substrate 20. The curved display panel is opposite to the flat display panel, and the first signal line 22 and the pixel electrode 23 on the left side of the bending line MN are offset to the lower right relative to the black matrix 12, and since the thickness direction of the display panel is not changed, namely the first signal line 22 and the pixel electrode 23 move to the right along the third direction Z relative to the black matrix 12; the first signal lines 22 and the pixel electrodes 23 on the right side of the bending line MN are shifted downward and leftward with respect to the black matrix 12, and since the thickness direction of the display panel is not changed, it is equivalent to that the first signal lines 22 and the pixel electrodes 23 are shifted leftward with respect to the black matrix 12 along the third direction Z. It can be understood that, when the protruding direction of the curved display panel faces the color filter substrate 10, the second direction Y and the third direction Z are opposite to the second direction Y and the third direction Z shown in fig. 5.

The pixel electrode 23 includes a first edge and a second edge oppositely disposed along the third direction Z, and the second edge is located in the third direction Z of the first edge in the same pixel electrode 23. In the process of bending the flat display panel to form the curved display panel, the second edge moves in the third direction Z relative to the adjacent black matrix 12, so that the second edge is closer to the adjacent black matrix 12, and the first edge moves in the third direction Z relative to the adjacent black matrix 12, so that the first edge is farther from the adjacent black matrix 12.

Specifically, as shown in fig. 6 and 7, in the flat display panel, the orthographic projection of the black matrix 12 on the base substrate 21 covers the orthographic projection of the first edge of the pixel electrode 23 on the base substrate 21, that is, the orthographic projection of the black matrix 12 on the base substrate 21 covers the width of the portion of the pixel electrode 23 close to the first edge. In the process of changing the flat display panel into the curved display panel, even if the pixel electrode 23 is shifted toward the third direction relative to the black matrix 12 located on the side opposite to the first edge, the first edge can be ensured to be still covered by the black matrix 12 by designing a reasonable width of the black matrix 12 covering the portion of the pixel electrode 23 close to the first edge, so as to avoid the influence of the black domain on the transmittance stability, and meanwhile, the first signal line 22 adjacent to the first edge can be ensured to be still covered by the black matrix 12, so as to avoid light leakage.

Referring to fig. 6-8, in the flat display panel, the second edge 232a of the pixel electrode 23a on the left side of the bending line MN is located in the first direction Z relative to the first edge 231a, and the first edge 231a is covered by the adjacent black matrix 12 a. When the flat display panel is bent into a curved display panel, the first edge 231a moves to the left and downward in the second direction Y relative to the black matrix 12a, and in order to ensure that the first edge 231a is still located below the black matrix 12a in the formed curved display panel, the width of the portion of the black matrix 12a covering the right side of the pixel electrode 23a in the flat display panel state should be larger than the width of the portion of the black matrix 12a covering the right side of the pixel electrode 23a in the curved display panel state. In order to ensure that the second edge 232a is located below the black matrix 12a and the width of the left portion of the pixel electrode covered by the black matrix 12 is not too large to cause a significant decrease in transmittance in the curved display panel formed by moving the second edge 232a to the left and below the left black matrix as shown in the second direction Y, the black matrix 12 on the left side of the pixel electrode 23a may not cover the second edge 232a in the flat display panel state; or the black matrix 12 on the left side of the pixel electrode 23a may cover the second edge 232a, but the width of the black matrix 12 on the left side of the pixel electrode 23a covering the left side of the pixel electrode 23a should be smaller than the width of the black matrix 12a on the right side of the pixel electrode 23a covering the right side of the pixel electrode 23 a.

Referring to fig. 6-8, in the flat display panel, the second edge 232b of the pixel electrode 23b on the right side of the bending line MN is located in the first direction Z relative to the first edge 231b, and the first edge 231b is covered by the adjacent black matrix 12 b. When the flat display panel is bent into a curved display panel, the first edge 231b moves to the right and downward in the second direction Y relative to the black matrix 12b, and in order to ensure that the first edge 231b is still located below the black matrix 12b in the formed curved display panel, the width of the left portion of the pixel electrode 23b covered by the black matrix 12b in the flat display panel state should be larger than the width of the left portion of the pixel electrode 23b covered by the black matrix 12b in the curved display panel state. In order to ensure that the second edge 232b is located below the black matrix 12b and the width of the right portion of the pixel electrode 23b covered by the black matrix 12 is not too large to cause a significant decrease in transmittance in the curved display panel formed, the black matrix 12 on the right side of the pixel electrode 23a may not cover the second edge 232b in the flat display panel state; or the black matrix 12 on the right side of the pixel electrode 23b may cover the second edge 232b, but the width of the portion of the black matrix 12 on the right side of the pixel electrode 23b covering the right side of the pixel electrode 23b should be smaller than the width of the portion of the black matrix 12b on the left side of the pixel electrode 23b covering the left side of the pixel electrode 23 b.

That is, as shown in fig. 7, in the process of manufacturing the flat display panel, the black matrix 12 is designed to be widened in the third direction Z, compared to the conventional flat display panel. In one embodiment of the present application, as shown in fig. 8, in the process of manufacturing the curved display panel, the widths of the left and right sides of the pixel electrode 23 covered by the black matrix are substantially the same in the final curved display panel.

As shown in fig. 7, in the process of manufacturing the flat display panel, the pixel electrode 23 in the flat display panel includes a first branch electrode 23 ', a second branch electrode 23 ″ arranged along the third direction Z, and a slit 230 between the branch electrodes, an edge of the first branch electrode 23' close to the black matrix 12 is a first edge 231, and an edge of the second branch electrode 23 ″ close to the black matrix 12 is a second edge 232. In the flat display panel, the width of the first branch electrode 23' is d1, the orthographic projection of the black matrix 12 on the substrate 21 covers the first edge 231, and the minimum distance between the first edge 231 and the edge of the covered black matrix 12 close to the pixel electrode 23 is d6, wherein d1 is greater than or equal to d6 is greater than or equal to 0.5d 1. In one embodiment of the present application, 2um ≧ d6 ≧ 0.5 um. When d6 satisfies the above relation, the first edge 231 is not displaced to an area not covered by the black matrix 12 in the process of preparing a curved display panel from a flat display panel.

With reference to fig. 7, in the process of manufacturing the flat display panel, in the first branch electrode 23 ' and the black matrix 12 which are correspondingly disposed, a distance between an edge of the black matrix 12 far away from the first branch electrode 23 ' and the first edge 231 of the first branch electrode 23 ' is d7, and d7 is greater than or equal to 8 μm. That is, as shown in fig. 7, in the black matrix 12 and the first branch electrode 23 'located in the opposite direction of the third direction Z, the distance between the edge of the black matrix 12 located in the opposite direction of the third direction Z and the first edge 231 of the first branch electrode 23' is greater than 8 μm.

With reference to fig. 7, in the process of manufacturing the flat display panel, in the second branch electrode 23 ″ and the black matrix 12 which are correspondingly disposed, the distance between the edge of the black matrix 12 far away from the second branch electrode 23 ″ and the first edge 231 of the second branch electrode 23 ″ is d8, and d8 ≧ 8 μm. That is, as shown in fig. 7, in the black matrix 12 and the second branch electrode 23 ″ located in the third direction Z, the distance between the edge of the black matrix 12 located in the third direction Z and the second edge 232 of the second branch electrode 23 ″ is greater than 8 μm.

When d7 and d8 satisfy the above ranges, the distances between the first edge 231 and the second edge 232 and the outer edges of the adjacent black matrixes are not too small in the process of preparing the curved display panel from the flat display panel, thereby avoiding the color cast problem.

In one embodiment of the present application, in the process of manufacturing a curved display panel, the curved display panel includes regions having different curvature of curvature. The black matrix 12 includes a first black matrix and a second black matrix arranged along the first direction X, wherein a curvature of the curved display panel corresponding to a region where the first black matrix is located is greater than a curvature of the curved display panel corresponding to a region where the second black matrix is located. The width of the first black matrix in the third direction is greater than the width of the second black matrix in the third direction Z during the process of manufacturing the flat display panel. And the width of the part where the first edge of the pixel electrode is covered by the first black matrix is larger than the width of the part where the second edge of the pixel electrode is covered by the second black matrix. Since the larger the curvature is, the larger the shift distance of the pixel electrode 23 with respect to the black matrix 23 is, the larger the width covered by the black matrix in the flat display panel is designed to be, and the more effectively the first edge 231 is prevented from being shifted to the area not covered by the black matrix.

Referring to fig. 6 and 8, in the process of manufacturing the curved display panel, the curved display panel includes a first region a1 and a second region a2, the first region a1 and the second region a2 are symmetrical about a bending line MN, the bending line MN is perpendicular to the first direction X, and the black matrix 12a located in the first region a1 and the black matrix 12b located in the second region a2 are symmetrical about the bending line MN. Referring to fig. 6 and 7, in the process of manufacturing the flat display panel, the black matrix 12a located in the first area a1 and the black matrix 12b located in the second area a2 are symmetrical about the bending line MN.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A curved display panel, comprising:

the color film substrate comprises a black matrix;

the array substrate is arranged opposite to the color film substrate; the array substrate comprises a substrate, a pixel electrode layer and a signal line layer, wherein the pixel electrode layer and the signal line layer are arranged on one side of the substrate, which faces the color film substrate; the pixel electrode layer comprises a plurality of pixel electrodes and the pixel electrodes comprise a first edge and a second edge which are oppositely arranged along a first direction; the signal line layer comprises a plurality of first signal lines arranged along the first direction; the first direction is parallel to the bending direction of the curved display panel;

the black matrixes comprise a plurality of hollow parts, and the hollow parts are arranged in one-to-one correspondence with the pixel electrodes; the orthographic projection of the first signal line on the substrate base plate is positioned between the orthographic projections of the adjacent pixel electrodes on the substrate base plate; an orthographic projection of the black matrix on the substrate base plate covers an orthographic projection of the first signal line on the substrate base plate, and covers an orthographic projection of at least one of the first edge and the second edge on the substrate base plate.

2. The curved display panel of claim 1, wherein the second edge is disposed in a second direction of the first edge; in the process of forming the curved display panel by the flat display panel, the central line of the first signal line moves towards the second direction relative to the central line of the black matrix; the orthographic projection of the black matrix on the pixel electrode layer covers the first edge.

3. The curved display panel according to claim 2, wherein the curved display panel comprises a first region and a second region, the first region and the second region are symmetrical about a bending line, the bending line is perpendicular to the first direction, and the black matrix of the first region and the black matrix of the second region are symmetrical about the bending line.

4. The curved display panel of claim 1, wherein the black matrix comprises a first black matrix and a second black matrix, the first black matrix and the second black matrix are arranged along the first direction, and a curvature of the curved display panel corresponding to a region of the first black matrix is greater than a curvature of the curved display panel corresponding to a region of the second black matrix; the width of the first black matrix is greater than the width of the second black matrix.

5. The curved display panel of claim 2, wherein the pixel electrodes comprise a first branch electrode and a second branch electrode arranged along the first direction, and the width of the first branch electrode is d 1; the edge of the first branch electrode close to the black matrix is the first edge, and the edge of the second branch electrode close to the black matrix is the second edge;

the orthographic projection of the black matrix on the substrate base plate covers the first edge, the minimum distance between the first edge and the edge of the black matrix covering the first edge is d2, wherein d1 is more than or equal to d2 and more than or equal to 0.5d 1.

6. The curved display panel of claim 5, wherein 2um ≧ d2 ≧ 0.5 um.

7. The curved display panel of claim 5, wherein the first branch electrode and the black matrix are correspondingly disposed, and the distance between the edge of the black matrix far away from the first branch electrode and the first edge of the first branch electrode is d3, d3 ≧ 8 μm;

in the second branch electrode and the black matrix which are correspondingly arranged, the distance between the edge of the black matrix far away from the second branch electrode and the second edge of the second branch electrode is d4, and d4 is more than or equal to 8 μm.

8. A display device comprising the curved display panel and the backlight module as claimed in any one of claims 1 to 7.

9. A method for manufacturing a curved display panel, the method being used for manufacturing the curved display panel according to any one of claims 1 to 7, the method comprising:

preparing a flat display panel, wherein the prepared flat display panel comprises a color film substrate and an array substrate which are oppositely arranged in a laminating manner; the color film substrate comprises a black matrix; the array substrate comprises a substrate, a pixel electrode layer and a signal line layer, wherein the pixel electrode layer and the signal line layer are arranged on one side of the substrate, which faces the color film substrate; the pixel electrode layer comprises a plurality of pixel electrodes and the pixel electrodes comprise a first edge and a second edge which are arranged along a third direction; the signal line layer comprises a plurality of first signal lines arranged along the third direction; the black matrixes comprise a plurality of hollow parts, and the hollow parts are arranged in one-to-one correspondence with the pixel electrodes; the orthographic projection of the first signal line on the substrate base plate is positioned between the orthographic projections of the adjacent pixel electrodes on the substrate base plate; the orthographic projection of the black matrix on the substrate base plate covers the orthographic projection of the first signal line on the substrate base plate and covers the orthographic projection of the first edge on the substrate base plate;

preparing a curved display panel, and bending the flat display panel along the first direction;

in the process of preparing the curved-surface display panel by the flat display panel, the first signal line moves towards the second direction relative to the corresponding black matrix, and the third direction is perpendicular to the thickness direction of the flat display panel and is parallel to the second direction after being bent along the first direction.

10. The method according to claim 9, wherein the pixel electrode comprises a first branch electrode and a second branch electrode arranged along the third direction during the process of manufacturing the flat display panel, and the width of the first branch electrode is d 1; the edge of the first branch electrode close to the black matrix is the first edge, and the edge of the second branch electrode close to the black matrix is the second edge; the orthographic projection of the black matrix on the substrate base plate covers the first edge, the minimum distance between the first edge and the edge of the black matrix covering the first edge is d6, wherein d1 is more than or equal to d6 and more than or equal to 0.5d 1.

11. The method according to claim 10, wherein 2 um. gtoreq.d 6. gtoreq.0.5 um.

12. The method of claim 9, wherein, in the process of fabricating the flat display panel, the distance between the edge of the black matrix far away from the first branch electrode and the first edge of the first branch electrode is d7, d7 ≧ 8 μm;

in the second branch electrode and the black matrix which are correspondingly arranged, the distance between the edge of the black matrix far away from the second branch electrode and the second edge of the second branch electrode is d8, and d8 is more than or equal to 8 μm.

13. The method according to claim 9, wherein the black matrix comprises a first black matrix and a second black matrix, the first black matrix and the second black matrix are arranged along the first direction during the process of manufacturing the curved display panel, and a curvature of the curved display panel corresponding to a region where the first black matrix is located is greater than a curvature of the curved display panel corresponding to a region where the second black matrix is located;

in the process of manufacturing the flat display panel, the width of the first black matrix along the third direction is greater than the width of the second black matrix along the third direction.

14. The method according to claim 9, wherein in the process of manufacturing the curved display panel, the curved display panel includes a first region and a second region, the first region and the second region are symmetrical about a bending line, and the bending line is perpendicular to the first direction;

the black matrix corresponding to the first region is symmetrical to the black matrix corresponding to the second region about the bending line in a process of manufacturing the flat display panel.