Display substrate, preparation method thereof, and display device

Abstract

The present application provides a display substrate, a preparation method thereof, and a display device. The display substrate includes a display area; and a peripheral area disposed around the display area and including a bending area; wherein, a protrusion is provided at an edge of the peripheral area, and the protrusion has an alignment mark for the bending area. In the display substrate provided by the present application, by providing a protrusion at the edge of the peripheral area and providing an alignment mark on the protrusion, alignment marks can be provided in an area where the display substrate is not covered by other film layers (such as a heat dissipation film), that is, there is no need to provide alignment marks in an area where the display substrate is covered by other film layers (such as a heat dissipation film layer), thereby avoiding operations such as slotting on other film layers (such as a heat dissipation film layer), avoiding exposure of the display area under light, and thus reducing the risk of mura defects.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and in particular, to a display substrate, a method for manufacturing the same, and a display device. Background Art

[0002] OLED (organic light-emitting diode) is increasingly widely used in the field of consumer electronics, especially in the mobile phone market. Currently, the pad bending technology is adopted at the border of the display substrate. In order to improve the alignment accuracy of bending, alignment marks are usually set on the display substrate, and positioning is achieved by identifying the alignment marks.

[0003] In the related art, the alignment marks are set between the edge and the display area of the display substrate. When the distance between the edge and the display area of the display substrate is very narrow, it is easy to cause a large exposure risk in the display area when preparing the related film layers subsequently due to avoiding the alignment marks. In this way, mura defects are likely to occur at the exposed areas after illumination. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a display substrate.

[0005] Based on the above purpose, the present application provides a display substrate, including:

[0006] A display area; and

[0007] A peripheral area, disposed on the periphery of the display area and including a bending area;

[0008] Wherein, a protrusion is provided at the edge of the peripheral area, and the protrusion has an alignment mark of the bending area.

[0009] In some embodiments, taking the plane parallel to the display area as a reference plane, the orthographic projection of the bending area on the reference plane does not overlap with the orthographic projection of the protrusion on the reference plane.

[0010] In some embodiments, the display substrate further includes a curved surface area. Taking the plane parallel to the display area as a reference plane, the orthographic projection of the curved surface area on the reference plane does not overlap with the orthographic projection of the protrusion on the reference plane; or

[0011] One end of the first area for setting the protrusion, which is far from the bending area, has an arc chamfer. Taking the plane parallel to the display area as a reference plane, the orthographic projection of the arc chamfer on the reference plane does not overlap with the orthographic projection of the protrusion on the reference plane.

[0012] In some embodiments, the distance between the arc chamfer or the side of the curved area close to the bending area and the edge of the bending area close to the protrusion is less than 3 mm, the protrusion is arranged on the side of the first area close to the bending area, and the third edge of the protrusion close to the bending area does not exceed the first edge of the bending area close to the first area.

[0013] In some embodiments, the distance between the arc chamfer and the bending zone is greater than or equal to 3 mm, the protrusion is close to the arc chamfer, and the protrusion is away from the second edge of the bending zone and does not exceed the edge of the arc chamfer close to the bending zone.

[0014] In some embodiments, the distance between the curved area and the bending area is greater than or equal to 3 mm, and the protrusion is arranged on a side of the first area close to the curved area.

[0015] In some embodiments, a distance between an edge of the protrusion close to the curved area and an edge of the curved area close to the bending area is greater than or equal to 0.2 mm.

[0016] In some embodiments, a distance between a third edge of the protrusion close to the bending zone and a first edge of the bending zone close to the first zone is greater than or equal to 1 mm.

[0017] In some embodiments, a plurality of thin film transistors are further included, each thin film transistor including a gate layer and a source / drain layer, and the alignment mark is provided in the same layer as the gate layer or the source / drain layer.

[0018] In some embodiments, a protective layer is further provided on the outer surface of the bending area; in the direction in which the peripheral area is away from the display area, the protrusion is not farther away from the edge of the display area than the farthest surface of the protective layer from the display area.

[0019] In some embodiments, a heat dissipation film is further included, which is arranged on the light-emitting side away from the display substrate; taking a surface parallel to the display area as a reference surface, the orthographic projection of the heat dissipation film on the reference surface overlaps with the orthographic projection of the display area on the reference surface.

[0020] An embodiment of the present application further provides a display device, comprising a display substrate as described in any of the preceding items.

[0021] The present invention also provides a method for preparing a display substrate, the method comprising:

[0022] forming a display substrate, the display substrate comprising a display area and a peripheral area disposed around the display area and including a bending area;

[0023] Form a protrusion at the edge of the peripheral region;

[0024] Form an alignment mark for the bending area on the protrusion.

[0025] In some embodiments, it further includes: forming a heat dissipation film on the light-emitting side away from the display substrate; taking the plane parallel to the display area as a reference plane, and the orthographic projection of the heat dissipation film on the reference plane overlaps with the orthographic projection of the display area on the reference plane.

[0026] As can be seen from the above, for the display substrate provided in this application, by setting a protrusion at the edge of the peripheral region and setting an alignment mark on the protrusion, an alignment mark can be set in the area where the display substrate is not covered by other film layers (such as the heat dissipation film), that is, there is no need to set an alignment mark in the area where the display substrate is covered by other film layers (such as the heat dissipation film layer), thereby avoiding operations such as slotting on other film layers (such as the heat dissipation film layer), preventing the display area from being exposed under light, and thus reducing the risk of mura defects. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in this application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1a It is a schematic structural diagram of an exemplary display substrate;

[0029] Figure 1b For Figure 1a It is a schematic structural diagram of the exemplary display substrate after bending;

[0030] Figure 2a It is a rear view of an exemplary display substrate;

[0031] Figure 2b For Figure 2a It is an enlarged view of part A in

[0032] Figure 2c For Figure 2b It is a sectional view along the CC' direction in

[0033] Figure 3 It is a partial view of the lower border of an exemplary display substrate according to an embodiment of this application;

[0034] Figure 4 It is another partial view of the lower border of an exemplary display substrate according to an embodiment of this application;

[0035] Figure 5 is Figure 3 A sectional view along the XX direction;

[0036] Figure 6a A schematic diagram showing the position of exemplary alignment marks in an embodiment of the present application;

[0037] Figure 6b Another schematic diagram showing the position of exemplary alignment marks in an embodiment of the present application;

[0038] Figure 7 A schematic diagram showing the structure with a flat surface of an exemplary display substrate in an embodiment of the present application;

[0039] Figure 8a A schematic diagram showing one position of alignment marks for a 2.5D cover plate in an embodiment of the present application;

[0040] Figure 8b Another schematic diagram showing the positional relationship of alignment marks for a 2.5D cover plate in an embodiment of the present application;

[0041] Figure 8c Another schematic diagram showing the positional relationship of alignment marks for a 2.5D cover plate in an embodiment of the present application;

[0042] Figure 9a A schematic diagram showing one structure of alignment marks in an embodiment of the present application;

[0043] Figure 9b A schematic diagram showing another structure of alignment marks in an embodiment of the present application;

[0044] Figure 10 A flowchart of a method for manufacturing an exemplary display substrate in an embodiment of the present application;

[0045] Figure 11a A schematic diagram of the path of the first cutting of an exemplary protruding portion in an embodiment of the present application;

[0046] Figure 11b A schematic diagram of the path of the second cutting of an exemplary protruding portion in an embodiment of the present application. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0048] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meanings understood by those of ordinary skill in the field to which this application belongs. The "first", "second" and similar terms used in the embodiments of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "include" or "comprise" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connect" or "be connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0049] Figures 1a to 1b FIG. shows a front view of an exemplary display substrate before and after bending. Among them, Figure 1a FIG. shows a schematic structural diagram of an exemplary display substrate before bending. Figure 1b FIG. shows Figure 1a a schematic structural diagram of the exemplary display substrate after bending.

[0050] As Figure 1a shown, the display substrate may include four borders: upper, lower, left, and right. Among them, especially the lower border is the largest. In order to reduce the border of the display substrate, a pad bending technology may be adopted on the lower border of the display surface to bend a part of the lower border (such as a part of the flexible circuit board) to the back of the display substrate, that is, to obtain Figure 1b .

[0051] Figures 2a to 2c FIG. shows a rear view of another exemplary display substrate (after bending). Among them, Figure 2a is a rear view of the exemplary display substrate. Figure 2b is Figure 2a an enlarged view of the area A in Figure 2c is Figure 2a a cross-sectional view along the CC' direction in

[0052] As Figure 2a shown, it is a schematic structural diagram of the back of the display substrate after bending a part of the lower border to the back of the display substrate. Among them, area A is the local structure of the lower border (the structure at the junction of the lower border and the left border). As Figure 2b shown, after enlarging area A, a heat dissipation film layer 100 is provided on the backlight side of the display substrate. The display substrate may include a display area (Active Area, AA area) and a peripheral area. The peripheral area is provided on the periphery of the display area. AsFigure 2b and Figure 2c As shown in Figure 2c , a bent area 410 formed by bending the display substrate is further provided in the peripheral area. In order to improve the alignment accuracy of the bent area, alignment marks 400 (mark) are usually provided in the peripheral area, and positioning is achieved by recognizing the alignment marks 400.

[0053] Some heat dissipation film layers (SCF) are provided on the back of the display substrate to guide the heat generated during the operation of the display substrate to the heat dissipation film layer. The heat dissipation film layer usually shrinks inward compared to the display substrate and does not exceed the edge of the display substrate (panel). As Figure 2b and 2c shown, the lower edge 100 of the heat dissipation film layer is usually located between the lower edge 210 of the display area and the lower edge 310 of the display substrate, and the alignment mark 400 is provided between the lower edge 210 of the display area and the lower edge 100 of the heat dissipation film layer. In this way, a slot 110 needs to be provided in the heat dissipation film layer to expose the alignment mark 400 for easy positioning and recognition. However, since the distance between the lower edge 210 of the display area and the lower edge 310 of the display substrate is small, the inner edge of the slot 110 of the lower edge 100 of the heat dissipation film layer is almost flush with the lower edge 210 of the display area. In actual processes, due to the shape tolerance of the slot 110 of the heat dissipation film layer and the fitting position tolerance of the heat dissipation film layer, the inner edge of the slot 110 of the heat dissipation film layer on the actually manufactured display substrate product will be located within the lower edge 210 of the display area, resulting in the display area on the back of the display substrate not being completely covered. In this way, after illumination, it is easy to cause uneven brightness in the display area and easy to generate mura defects. Moreover, with the trend of the lower border design becoming narrower and narrower, the distance between the lower edge 210 of the display area and the lower edge 310 of the display substrate will become smaller and smaller, and the risk of generating mura defects will become greater and greater.

[0054] Based on this, the embodiment of the present application provides a display substrate, which can, to a certain extent, solve the problem that the inner edge of the slot 110 of the heat dissipation film layer 100 will be located within the lower edge 210 of the display area, resulting in the display area on the back of the display substrate not being completely covered and easy to generate mura defects after illumination.

[0055] Figure 3 FIG. shows a partial view of the lower border (for example, the junction of the lower border and the left border) of the exemplary display substrate according to the embodiment of the present application.

[0056] As Figure 3As shown, the display substrate provided by the embodiment of the present application may include a display area and a peripheral area. The peripheral area may be disposed around the display area and may include a bending area 410. Wherein, a protruding portion 500 is provided at the edge of the peripheral area (for example, the edge far from the display area, that is, the lower edge), and the protruding portion 500 has an alignment mark 400 of the bending area 410.

[0057] For the display substrate provided by the embodiment of the present application, by providing the protruding portion 500 at the edge of the peripheral area (for example, the edge far from the display area, that is, the lower edge) and providing the alignment mark 400 on the protruding portion 500, the alignment mark 400 can be provided in an area where the display substrate is not covered by other film layers (such as the heat dissipation film 800), that is, there is no need to provide the alignment mark 400 in an area where the display substrate is covered by other film layers (such as the heat dissipation film layer 100 is opened), thereby avoiding providing slots 110, etc. on other film layers (such as the heat dissipation film layer 100), avoiding the exposure of the display area under light, and thus reducing the risk of mura defects.

[0058] In some embodiments, a heat dissipation film 800 may be provided on a side opposite to the light-emitting side of the display substrate. Taking the plane parallel to the display area as a reference plane, the orthographic projection of the heat dissipation film 800 on the reference plane overlaps with the orthographic projection of the display area on the reference plane. In this way, the heat dissipation film can cover the display area, avoid the exposure of the display area under light, and thus reduce the risk of mura defects.

[0059] In some embodiments, taking the plane parallel to the display area as a reference plane, the orthographic projection of the bending area 410 on the reference plane does not overlap with the orthographic projection of the protruding portion 500 on the reference plane. It can be understood that in the peripheral area, the bending area 410 and the protruding portion 500 are discontinuous. In this way, the influence of the bending of the bending area 410 on the protruding portion 500 can be avoided, the protruding portion 500 can be kept flat, and thus the alignment mark 400 can be made as flat as possible, improving the recognition accuracy of the alignment mark 400.

[0060] Figure 4 A partial view of another lower border (for example, the junction of the lower border and the right border) of the exemplary display substrate according to the embodiment of the present application is shown.

[0061] In some embodiments, as Figure 4 shown, a protruding portion 500 may also be provided near the right border of the display substrate in the peripheral area. That is, two protruding portions 500 may be provided at the edge of the peripheral area. It can be understood that along the width direction of the display substrate (that is, the direction from left to right), on the left side of the lower border of the display substrate (for example Figure 3 ) and the right side (for example Figure 4)The protruding portions 500 can be provided separately. In this way, by providing the protruding portions 500 on both sides of the bending area 410 respectively, better positioning can be achieved through the alignment marks 400 on both sides of the bending area 410, the bending deviation can be minimized as much as possible, the overall stress distribution uniformity of the bending area 410 can be improved, and problems such as fracture of the inorganic layer in the bending area 410 caused by uneven stress can be avoided.

[0062] It should be understood that, since the structures of the protruding portions 500 provided on the left side (for example Figure 3 ) and the right side (for example Figure 4 ) of the lower border of the display substrate are the same, for the sake of avoiding repetition, the protruding portion 500 at the left side of the lower border of the display substrate will be described below.

[0063] Figure 5 shows Figure 3 a cross-sectional view along the XX direction.

[0064] In some embodiments, referring to Figure 5 , a cover plate 600 may further be included. The cover plate 600 can be provided on the light-emitting side of the display substrate 200. The cover plate 600 is used to fit the shape of one side of the display substrate, and the shape is adapted to that of the display substrate 200. For example, if the display substrate has a planar structure, the cover plate 600 can be a 2.5D cover plate. If the display substrate is a curved screen, for example, the edge of the display substrate bends in a direction away from the light-emitting side, the cover plate 600 can be a 3D cover plate. An optical adhesive (OCA) layer 810 and a polarizer (POL) layer 820 stacked along the light-emitting side of the display substrate may further be included between the cover plate 600 and the light-emitting side of the display substrate. A back film (BF) 830 may further be included between the backlight side of the display substrate and the heat dissipation film 800. A bending spacer layer 840 may further be provided between the heat dissipation film 800 and the back film at the folded part of the display substrate.

[0065] Return to Figure 3, the display substrate can be a curved screen. In the display substrate with such a structure, after the display substrate is bent, along the width direction of the display substrate, it can include a curved surface area (for example, the curved surface area can be used for display), a first area, and a bending area 410. The curved surface area is connected to the first area, and there is a virtual dividing line 710 between the curved surface area and the first area. The first area is connected to the bending area 410, and the virtual dividing line between the first area and the bending area 410 can be the first edge 411 after the display substrate is bent. That is, the curved surface area is connected to the side of the first area away from the bending area 410. The first area can be understood as the area from the virtual dividing line 710 between the curved surface area and the first area to the first edge 411 of the bending area 410 after the display substrate is bent. The protrusion 500 can be arranged in the first area, so that the protrusion 500 can be kept as flat as possible, which is convenient for accurately identifying the alignment mark 400. The protrusion 500 can be arranged on the side of the first area close to the bending area 410, or on the side of the first area close to the curved surface area. It should be understood that the main area of the cover plate 600 for fitting the curved screen can include a cover plate curved surface area and a cover plate first area. The virtual dividing line between the cover plate curved surface area and the cover plate first area (that is, the starting bending position of the 3D cover plate) basically coincides with the virtual dividing line 710 between the curved surface area and the first area of the display substrate.

[0066] In some embodiments, when the space in the first area is insufficient, for example, when the distance d1 between the curved surface area (the virtual dividing line 710 between the curved surface area and the first area) and the bending area 410 (the first edge 411 of the bending area 410 close to the first area, that is, the left edge) is less than 3 mm, the protrusion 500 can be arranged on the side of the first area close to the bending area 410, so that the protrusion 500 can be as far away from the curved surface area as possible, and the protrusion 500 can be kept as flat as possible, so that the alignment mark 400 can be as flat as possible, which is convenient for accurately identifying the alignment mark 400 and improving the accuracy of identifying the alignment mark 400. This can avoid the situation that the alignment mark 400 cannot be accurately identified when it is arranged in the curved surface area.

[0067] In some embodiments, the protrusion 500 can be as close as possible to the side of the first area close to the bending area 410, as long as the edge of the protrusion 500 close to the bending area does not exceed the dividing line between the first area and the bending area 410 (the first edge 411 of the bending area 410 close to the first area, that is, the left edge). For example, the edge of the protrusion 500 close to the bending area 410 can be arranged at the first edge 411. It can be understood that at this time, the edge of the protrusion 500 close to the bending area and the first edge 411 of the bending area 410 close to the first area can be partially approximately coincident and discontinuous. Specifically, as Figure 3As shown in the figure, with the plane parallel to the display area as the reference plane, the projection of the edge of the protrusion 500 close to the bending area on the reference plane does not overlap with the projection of the first edge 411 of the bending area 410 on the reference plane. This makes the protrusion 500 flat, so that the alignment mark 400 is as flat as possible, improving the accuracy of identifying the alignment mark 400.

[0068] Figures 6a to 6b The figure shows a schematic diagram of the position of the exemplary alignment mark 400 of the embodiment of the present application. Among them, Figure 6a This is a schematic diagram of the position of the exemplary alignment mark 400 of the embodiment of the present application. Fig. 6b is another schematic diagram of the position of the exemplary alignment mark 400 of the embodiment of the present application.

[0069] In some embodiments, such as Figure 6a and Figure 6b shown, when the space in the first area is sufficient, for example, when the distance d1 between the curved surface area (the virtual dividing line 710 between the curved surface area and the first area) and the bending area 410 (the first edge 411 of the bending area 410 close to the first area) is greater than or equal to 3 mm, the protrusion 500 can be arranged on the side of the first area close to the curved surface area. This can simplify the process, and the protrusion 500 can be formed only by one cutting.

[0070] In some embodiments, such as Figure 6a shown, the distance d2 between the edge of the protrusion 500 close to the curved surface area (that is, the second edge 510 of the protrusion far from the bending area 410) and the virtual dividing line 710 (that is, the bending position of the 3D cover plate) can be greater than 0.2 mm, or as Figure 6b shown, the distance d2 between the edge of the protrusion 500 close to the curved surface area (that is, the second edge 510 of the protrusion far from the bending area 410) and the virtual dividing line 710 (that is, the bending position of the 3D cover plate) can be equal to 0.2 mm. That is, the minimum distance between the protrusion 500 and the curved surface area is more than 0.2 mm. This can prevent the protrusion 500 from entering the curved surface area of the 3D cover plate when the display substrate and the 3D cover plate are attached and offset to the extreme position, avoiding the alignment mark 400 not being accurately recognized due to the bending of the curved surface area, and improving the accuracy of identifying the alignment mark 400.

[0071] In some embodiments, the distance d3 between the edge of the protrusion 500 away from the curved surface area (i.e., the third edge 520 of the protrusion close to the bending area 410) and the first edge 411 can be 1 mm, or the distance d3 between the edge of the protrusion 500 away from the curved surface area (i.e., the third edge 520 of the protrusion close to the bending area 410) and the first edge 411 can be greater than 1 mm. That is, the minimum distance between the protrusion 500 and the bending area 410 is more than 1 mm. In this way, during the preparation of the protrusion 500 (such as laser cutting preparation), the first edge 411 can be prevented from being burned during the cutting of the protrusion 500.

[0072] Figure 7 The schematic structural diagram shows the surface of the exemplary display substrate in the embodiment of the present application as a plane. Figures 8a to 8c The schematic structural diagram shows another structure of the exemplary alignment mark 400 in the embodiment of the present application. Among them, Figure 8a The schematic position diagram shows a position of the alignment mark 400 when the 2.5D cover plate is an exemplary one in the embodiment of the present application. Figure 8b The schematic position relationship diagram shows another position relationship of the alignment mark 400 when the 2.5D cover plate is an exemplary one in the embodiment of the present application. Figure 8c The schematic position relationship diagram shows yet another position relationship of the alignment mark 400 when the 2.5D cover plate is an exemplary one in the embodiment of the present application.

[0073] Reference Figure 7 , the surface of the display substrate can be a plane. For example, the shape of the display substrate can be rectangular. The corners of the display substrate can be chamfered, such as the arc chamfer 730. Reference Figures 8a to 8c , in the display substrate with this structure, the peripheral area can include a first area connected to the bending area 410. The dividing line between the first area and the bending area 410 can be the first edge 411 (such as the left edge) of the bending area 410 close to the first area. One end of the first area away from the bending area 410 has an arc chamfer 730. Specifically, the first area can be understood as the area from the left edge of the display substrate to the first edge 411 of the bending area 410. The protrusion 500 can be arranged in the first area, so that the protrusion 500 can be kept as flat as possible, thus facilitating the good recognition of the alignment mark 400. The protrusion 500 can be arranged on the side of the first area close to the bending area 410, or on the side of the first area close to the arc chamfer 730. It should be understood that the main area of the cover plate 600 for the display substrate can be a plane and has a cover plate arc chamfer. The boundary of the cover plate arc chamfer and the boundary of the arc chamfer 730 of the display substrate are almost not in the same position.

[0074] In some embodiments, as Figure 8aAs shown, when the space in the first region is insufficient, for example, when the distance d1 between the arc chamfer 730 (the arc chamfer 730 is close to the virtual edge 720 of the bending region) and the bending region 410 (the first edge 411 of the bending region 410 close to the first region) is less than 3 mm, the protruding portion 500 can be provided on the side of the first region close to the bending region 410, so that the protruding portion 500 can be as far away from the arc chamfer 730 as possible, and the alignment mark 400 can be kept as flat as possible, so that the alignment mark 400 is as flat as possible, which is convenient for accurately identifying the alignment mark 400 and improving the accuracy of identifying the alignment mark 400. This can avoid the situation where the alignment mark 400 cannot be accurately identified when it is provided at the arc chamfer 730.

[0075] In some embodiments, the protruding portion 500 can be as close as possible to the side of the first region close to the bending region 410, as long as the third edge 520 of the protruding portion 500 close to the bending region does not exceed the boundary line between the first region and the bending region 410 (the first edge 411 of the bending region 410 close to the first region). For example, the third edge 520 of the protruding portion 500 close to the bending region 410 can be provided at the first edge 411. It can be understood that at this time, the third edge 520 of the protruding portion 500 close to the bending region 410 and the first edge 411 of the bending region 410 close to the first region can be partially approximately coincident and discontinuous. Specifically, as Figure 8a shown, taking the plane parallel to the display region as the reference plane, the orthographic projection of the third edge 520 of the protruding portion 500 close to the bending region on the reference plane does not overlap with the orthographic projection of the first edge 411 of the bending region 410 on the reference plane. To keep the protruding portion 500 flat, so that the alignment mark 400 is as flat as possible and improve the accuracy of identifying the alignment mark 400.

[0076] In some embodiments, as Figure 8b and Figure 8c shown, when the space in the first region is sufficient, for example, when the distance between the arc chamfer 730 (the arc chamfer 730 is close to the virtual edge 720 of the bending region) and the bending region 410 (the first edge 411 of the bending region 410 close to the first region) is greater than 3 mm or equal to 3 mm, the protruding portion 500 can be provided on the side of the first region close to the arc chamfer 730. This can simplify the process, and the protruding portion 500 can be formed only by one cutting.

[0077] In some embodiments, the protruding portion 500 can be set as close as possible to the arc chamfer 730, as long as the edge of the protruding portion 500 close to the arc chamfer 730 (that is, the second edge 510 of the protruding portion 500 away from the bending region 410) does not exceed the virtual edge 720 of the arc chamfer 730 (that is, the edge of the arc chamfer 730 close to the bending region 410). For example, as Figure 8cAs shown, the edge of the protruding portion 500 close to the arc chamfer 730 (i.e., the second edge 510 of the protruding portion away from the bending area) can coincide with the virtual edge 720.

[0078] In some embodiments, as Figure 8b and Figure 8c shown, the distance d3 between the edge of the protruding portion 500 away from the arc chamfer 730 (i.e., the third edge 520 of the protruding portion close to the bending area) and the first edge 411 can be 1 mm or more (i.e., greater than 1 mm or equal to 1 mm). In this way, during the preparation of the protruding portion 500 (such as laser cutting preparation), the first edge 411 can be prevented from being burned during the cutting of the protruding portion 500.

[0079] In some embodiments, returning to Figure 5 , a protective layer 420 can also be provided on the outer surface of the bending area 410 (i.e., the surface opposite to the bending direction of the bending area 410). The protective layer 420 is mainly used to support and protect the surface of the bending area 410, etc. The protective layer 420 can be an MCL (Micro Coating Layer) glue layer. The edge of the protruding portion 500 away from the display area may not exceed the outermost surface of the MCL glue layer away from the display area. In this way, the influence of the edge of the protruding portion 500 provided in the peripheral area on the assembly can be minimized as much as possible, facilitating assembly and avoiding wear of the protruding portion 500 during assembly.

[0080] Figure 9a FIG. shows a schematic structural diagram of a registration mark 400 according to an embodiment of the present application.

[0081] In some embodiments, the display substrate may include thin film transistors. The thin film transistors may include a gate layer and a source-drain layer. The registration mark 400 that can transmit light can be formed by directly forming a hollowed-out area on the gate layer or the source-drain layer. At this time, the principle of the registration mark can be understood as that in the gate layer or the source-drain layer, since the light transmittance at the position of the registration mark 400 is higher than that of other areas, the registration mark 400 can be recognized on both the light-emitting side and the backlight side of the display substrate, so that the registration mark 400 can be accurately recognized. It can be understood that the registration mark 400 can be provided in the internal stack of the display substrate.

[0082] Figure 9b FIG. shows another schematic structural diagram of a registration mark 400 according to an embodiment of the present application.

[0083] In some embodiments, the material of the alignment mark 400 can be a shaped metal, so that the alignment mark 400 can be disposed on the same layer as the gate layer or the source-drain layer. For example, processes such as exposure-etching-developing are performed on the gate layer or the source-drain layer to form the alignment mark 400, simplifying the preparation process of the alignment mark 400.

[0084] In some embodiments, taking the plane parallel to the display area as the reference plane, the shape of the orthographic projection of the alignment mark 400 on the reference plane can be common shapes such as a T shape or a cross shape, as long as it is convenient for identification.

[0085] For the display substrate provided by the embodiments of the present application, by providing a protrusion 500 at the edge of the peripheral area of the display substrate away from the display area, and providing an alignment mark 400 on the protrusion 500, the setting position of the alignment mark 400 does not overlap with the position where the heat dissipation film 800 adheres to the display substrate. There is no need to provide a notch on the heat dissipation film 800 to avoid the alignment mark 400, which can prevent the inner edge of the notch of the heat dissipation film 800 from being located within the lower edge 210 of the display area, thereby avoiding the mura defect caused by the display area not being completely covered.

[0086] Based on the same inventive concept, corresponding to the display substrate in any of the above embodiments, the present application further provides a display device. The display device includes the display substrate as described in any previous embodiment.

[0087] The display device in the above embodiment has the display substrate in any of the previous embodiments and has the beneficial effects of the corresponding display substrate embodiments, which will not be elaborated here.

[0088] Based on the same inventive concept, corresponding to the display substrate in any of the above embodiments, the embodiments of the present application further provide a method for manufacturing a display substrate for manufacturing the display substrate as described in any previous embodiment. Figure 10 The flowchart of an exemplary method for manufacturing a display substrate according to the embodiments of the present application is shown. The method may include the following steps.

[0089] In step S1010, a display substrate is formed, and the display substrate includes a display area and a peripheral area disposed outside the display area and including a bending area 410.

[0090] In step S1020, a protrusion 500 is formed at the edge of the peripheral area (such as the lower edge 210 of the peripheral area). In some embodiments, the protrusion can be formed by cutting in the form of a laser. For example, Figures 11a to 11b The cutting process of an exemplary protrusion 500 provided by the embodiments of the present application is shown. Among them, Figure 11a is the path of the first cutting (such as laser cutting), Figure 11bThe path for the second cutting (such as laser cutting).

[0091] In some embodiments, when the protrusion 500 is disposed on one side of the first region (such as Figure 3 in the region between the curved surface region and the virtual dividing line 710 between the first region and the first edge 411 of the bending region 410) close to the bending region 410, for example, referring to Figure 11a , a partial structure of the protrusion 500 (such as Figure 3 the structure not including the third edge 520 of the protrusion 500 close to the bending region in Figure 11b ) can be cut and formed at the bending region of the display substrate first. That is, the display substrate is subjected to the first cutting to form the adjacent protrusion and the bending region before the display substrate is bent. Then, referring to Figure 11b , the protrusion 500 is cut on the side close to the bending region to form the third edge 520 of the protrusion 500 close to the bending region, so that the protrusion 500 is disconnected and discontinuous from the bending region 410, thereby forming Figure 3 or Figure 8a the protrusion 500. That is, the protrusion is cut on the side close to the bending region so that the positive projection of the protrusion on the reference plane does not overlap with the positive projection of the bending region on the reference plane; the reference plane is a plane parallel to the display region. In this way, the display substrate before bending the bending region is formed. In this way, the influence of the bending of the bending region 410 on the protrusion 500 can be avoided, so that the protrusion 500 remains flat, thereby making the alignment mark 400 as flat as possible and improving the recognition accuracy of the alignment mark 400.

[0092] In other embodiments, when the protrusion 500 is disposed on the side of the first region far from the bending region 410, the protrusion 500 can be directly formed by cutting once at the lower edge 310 of the display substrate. For example, the protrusion 500 is directly cut at the lower edge 310 of the display substrate to obtain Figure 6a , Figure 6b , Figure 8a , Figure 8b or Figure 8c the protrusion 500 shown. In this way, the protrusion 500 can be formed by one cutting, and the protrusion 500 can be kept flat, thereby making the alignment mark 400 as flat as possible and improving the recognition accuracy of the alignment mark 400.

[0093] In step S1030, the alignment mark 400 of the bending region 410 is formed on the protrusion 500.

[0094] In some embodiments, the display substrate may include thin film transistors. The thin film transistors may include a gate layer and a source-drain layer. The transmissive alignment mark 400 (such asFigure 9a As shown. At this time, the principle of the pair of unmarked can be understood as follows: in the gate layer or the source-drain layer, since the light transmittance at the alignment mark 400 is higher than that of other regions, the alignment mark 400 can be recognized on both the light-emitting side and the backlight side of the display substrate, so that the alignment mark 400 can be accurately recognized. It can be understood that the alignment mark 400 can be set in the internal stack of the display substrate.

[0095] In some embodiments, the material of the alignment mark 400 can be a metal with a shape, so that the alignment mark 400 can be arranged on the same layer as the gate layer or the source-drain layer. For example, processes such as exposure-etching-developing are performed on the gate layer or the source-drain layer to form the alignment mark 400 (as shown in, for example Figure 9b ), which simplifies the manufacturing process of the alignment mark 400.

[0096] In some embodiments, it further includes pasting a heat dissipation film 800 on the side opposite to the light-emitting side of the display substrate (i.e., the backlight side). Taking the plane parallel to the display area as the reference plane, the orthographic projection of the heat dissipation film 800 on the reference plane overlaps with the orthographic projection of the display area on the reference plane. In this way, the heat dissipation film layer 100 does not need to be provided with a slot structure for avoiding the alignment mark 400, etc., to avoid the exposure of the display area, thereby reducing the risk of mura defects.

[0097] Those of ordinary skill in the art should understand that: the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, and they are not provided in detail for the sake of brevity.

[0098] In addition, for the sake of simplicity of description and discussion, and in order not to make the embodiments of the present application difficult to understand, the well-known power / ground connections to the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device may be shown in block diagram form in order to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present application are to be implemented (that is, these details should be completely within the understanding of those skilled in the art). In the case of elaborating specific details (such as circuits) to describe the exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0099] Although the present application has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

[0100] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. A display substrate, characterized in that, include: Display area; as well as a peripheral area, arranged at the periphery of the display area and including a bending area; Wherein, a protrusion is provided on the lower edge of the peripheral area, and the protrusion has an alignment mark of the bending area; The display substrate further comprises a curved surface area, wherein a surface parallel to the display area is used as a reference surface, and an orthographic projection of the curved surface area on the reference surface does not overlap with an orthographic projection of the protruding portion on the reference surface; or a first area for arranging the protruding portion has an arc-shaped chamfer at one end away from the bent area, wherein a surface parallel to the display area is used as a reference surface, and an orthographic projection of the arc-shaped chamfer on the reference surface does not overlap with an orthographic projection of the protruding portion on the reference surface; The display substrate also includes a heat dissipation film, which is arranged away from the light-emitting side of the display substrate; taking a surface parallel to the display area as a reference surface, the orthographic projection of the heat dissipation film on the reference surface at least partially overlaps with the orthographic projection of the display area on the reference surface.

2. The display substrate according to claim 1, wherein Taking a plane parallel to the display area as a reference plane, an orthographic projection of the bending area on the reference plane does not overlap with an orthographic projection of the protruding portion on the reference plane.

3. The display substrate according to claim 1, wherein The distance between the side of the arc chamfer or the curved area close to the bending area and the edge of the bending area close to the protrusion is less than 3 mm. The protrusion is arranged on the side of the first area close to the bending area, and the third edge of the protrusion close to the bending area does not exceed the first edge of the bending area close to the first area.

4. The display substrate according to claim 1, characterized in that, The distance between the arc chamfer and the bending zone is greater than or equal to 3 mm, the protrusion is close to the arc chamfer, and the protrusion is away from the second edge of the bending zone and does not exceed the edge of the arc chamfer close to the bending zone.

5. The display substrate according to claim 1, wherein The distance between the curved area and the bending area is greater than or equal to 3 mm, and the protrusion is arranged on a side of the first area close to the curved area.

6. The display substrate according to claim 5, wherein The distance between the edge of the protrusion close to the curved area and the edge of the curved area close to the bending area is greater than or equal to 0.2 mm.

7. The display substrate according to any one of claims 4 to 6, characterized in that A distance between a third edge of the protrusion close to the bending zone and a first edge of the bending zone close to the first zone is greater than or equal to 1 mm.

8. The display substrate according to claim 1, wherein The system further comprises a plurality of thin film transistors, wherein the thin film transistors comprise a gate layer and a source-drain layer, and the alignment mark is arranged in the same layer as the gate layer or the source-drain layer.

9. The display substrate according to claim 1, wherein It also includes a protective layer arranged on the outer surface of the bending area; in the direction of the peripheral area away from the display area, the edge of the protrusion away from the display area does not exceed the farthest surface of the protective layer from the display area.

10. A display device, characterized in that, The display substrate comprises the display substrate according to any one of claims 1 to 9.

11. A method for preparing a display substrate, characterized in that, The preparation method comprises: forming a display substrate, the display substrate comprising a display area and a peripheral area disposed around the display area and including a bending area; forming a protrusion at a lower edge of the peripheral region; An alignment mark for the bent area is formed on the protruding portion; the display substrate further includes a curved area, with a surface parallel to the display area serving as a reference surface, and an orthographic projection of the curved area on the reference surface does not overlap with an orthographic projection of the protruding portion on the reference surface; or a first area of the protruding portion is provided with an arc-shaped chamfer at one end away from the bent area, with a surface parallel to the display area serving as a reference surface, and an orthographic projection of the arc-shaped chamfer on the reference surface does not overlap with an orthographic projection of the protruding portion on the reference surface; A heat dissipation film is formed; the heat dissipation film is arranged away from the light-emitting side of the display substrate, and a surface parallel to the display area is used as a reference surface, and the orthographic projection of the heat dissipation film on the reference surface at least partially overlaps with the orthographic projection of the display area on the reference surface.

12. The method for preparing a display substrate according to claim 11, wherein, The forming of the protrusion at the edge of the peripheral area comprises: cutting the display substrate to form adjacent protrusions and a bending area before the display substrate is bent; The protrusion is cut on one side close to the bending area so that the orthographic projection of the protrusion on the reference plane does not overlap with the orthographic projection of the bending area on the reference plane; the reference plane is a plane parallel to the display area.

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