Display substrate and display device

Abstract

The utility model provides a display substrate and a display device. The display substrate comprises: a substrate; the display panel is provided with a display area and a non-display area surrounding the display area and comprises a first peripheral area, a bending area and a second peripheral area which are sequentially arranged in the direction away from the display area. A first source drain layer; a first flat layer; a second source drain layer; a second flat layer; a third source drain layer; a third flat layer; the power supply wire comprises a first part located in the first peripheral area and a second part at least located in the first peripheral area and the bending area; the first part and the third source-drain electrode layer are arranged on the same layer, and the second part and the second source-drain electrode layer are arranged on the same layer; the first barrier wall is arranged in the first peripheral area and surrounds the display area; first grooving; an inorganic encapsulation layer; the first part and the second part are overlapped in the direction perpendicular to the substrate and are in direct contact and electrical connection to form an overlapped part; the orthographic projection of the overlapping part on the substrate is located in the orthographic projection of the first groove on the substrate.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] With consumers demanding an ever-increasing screen-to-body ratio, narrow-border screens are becoming increasingly mainstream in the market. To achieve this narrow-border effect, a bending (pad bending) technology can be used on the border of the display substrate. In related technologies, the exposed organic film layer in the bending area easily absorbs moisture, which is then transferred to the light-emitting functional layer through the slope angle of the source and drain layers, causing the light-emitting material to fail. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a display substrate and a display device.

[0004] Based on the above objectives, the present application provides a display substrate, comprising:

[0005] A base substrate; the base substrate has a display area and a non-display area surrounding the display area, the non-display area including a first peripheral area, a bending area, and a second peripheral area sequentially arranged in a direction away from the display area;

[0006] A first source and drain layer is provided on the base substrate;

[0007] a first planarization layer, disposed on a side of the first source and drain electrode layer away from the base substrate;

[0008] a second source-drain electrode layer, disposed on a side of the first planar layer away from the base substrate;

[0009] a second planarization layer, disposed on a side of the second source / drain electrode layer away from the base substrate;

[0010] a third source-drain electrode layer, arranged on a side of the second planar layer away from the base substrate;

[0011] a third planarization layer, disposed on a side of the third source and drain electrode layer away from the substrate;

[0012] The display substrate includes a power supply line, the power supply line including a first portion located in the first peripheral area and a second portion located at least in the first peripheral area and the bending area; the first portion is disposed in the same layer as the third source and drain layer, and the second portion is disposed in the same layer as the second source and drain layer;

[0013] a first barrier wall disposed in the first peripheral area and surrounding the display area; the first barrier wall being disposed on the same layer as at least one of the first flat layer, the second flat layer, and the third flat layer; a first trench being disposed between the first barrier wall and the bending area, wherein an orthographic projection of the first trench on the base substrate does not overlap with an orthographic projection of the first flat layer, the second flat layer, and the third flat layer on the base substrate;

[0014] an inorganic encapsulation layer, disposed on a side of the first barrier wall away from the base substrate, and covering the first barrier wall;

[0015] The first portion and the second portion overlap in a direction perpendicular to the base substrate and are in direct contact and electrically connected to form an overlapping portion; the orthographic projection of the overlapping portion on the base substrate is within the orthographic projection of the first groove on the base substrate.

[0016] In some embodiments, the first portion extends along a first direction, and the second portion extends along the first direction; the orthographic projection of the first portion on the base substrate at least partially covers the orthographic projection of the second portion on the base substrate; wherein the first direction is a direction extending from the display area to the bending area; and the second direction is perpendicular to the first direction.

[0017] In some embodiments, along the second direction, at least a portion of the orthographic projection of the first portion on the substrate exceeds the orthographic projection of the second portion on the substrate.

[0018] In some embodiments, along the second direction, an orthographic projection of at least a portion of the second portion on the substrate exceeds an orthographic projection of the first portion on the substrate.

[0019] In some embodiments, a boundary where at least part of the first portion's orthographic projection on the substrate extends along the first direction is flush with a boundary where at least part of the second portion's orthographic projection on the substrate extends along the first direction.

[0020] In some embodiments, the power lines include a plurality of first power lines and a plurality of second power lines extending along the first direction; the plurality of first power lines and the plurality of second power lines are spaced apart in the second direction, and the plurality of first power lines are arranged between the plurality of second power lines; and the overlapping portion is arranged on the first power line at at least one end of the second direction.

[0021] In some embodiments, each of the first power lines is provided with the overlapping portion; and each of the second power lines is provided with the overlapping portion.

[0022] In some embodiments, the display substrate further includes a pixel defining layer and a light-emitting functional layer stacked on a side of the third flat layer away from the base substrate; the light-emitting functional layer is located in the display area; the orthographic projection of the pixel defining layer on the base substrate does not overlap with the orthographic projection of the first groove on the base substrate.

[0023] In some embodiments, the display substrate further includes an organic encapsulation layer; the orthographic projection of the organic encapsulation layer on the base substrate covers the orthographic projection of the light-emitting functional layer on the base substrate; the inorganic encapsulation layer includes a first inorganic encapsulation layer and a second inorganic encapsulation layer arranged in a stacked manner, and the second inorganic encapsulation layer is arranged on the side of the first inorganic encapsulation layer away from the base substrate; the organic encapsulation layer is arranged between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

[0024] In some embodiments, the display substrate further includes a second barrier wall; the second barrier wall is disposed on a side of the first barrier wall close to the display area; the second barrier wall is disposed on the same layer as at least one of the first planar layer, the second planar layer, the third planar layer, and the pixel defining layer;

[0025] A second trench is provided between the second barrier wall and the first barrier wall; an orthographic projection of the second trench on the base substrate does not overlap with an orthographic projection of the first flat layer, the second flat layer, the third flat layer and the pixel defining layer on the base substrate;

[0026] A third trench is provided between the second barrier wall and the display area; the orthographic projection of the third trench on the base substrate does not overlap with the orthographic projections of the first flat layer, the second flat layer, the third flat layer and the pixel defining layer on the base substrate.

[0027] In some embodiments, the first source-drain electrode layer, the second source-drain electrode layer, and the third source-drain electrode layer are respectively a composite layer structure of titanium / aluminum / titanium.

[0028] In some embodiments, the display substrate further includes a touch layer, which is arranged on a side of the inorganic packaging layer away from the base substrate; the touch layer includes an inorganic buffer layer, a first touch metal layer, a touch insulation layer and a second touch metal layer stacked in a direction away from the base substrate; the orthographic projection of the inorganic buffer layer on the base substrate covers the orthographic projection of the inorganic packaging layer on the base substrate.

[0029] In some embodiments, the display substrate further includes an organic layer, which is disposed on a side of the second touch metal layer away from the base substrate; the orthographic projection of the organic layer on the base substrate covers the orthographic projection of the inorganic buffer layer on the base substrate.

[0030] An embodiment of the present application further provides a display device, comprising a display substrate as described in any of the preceding items.

[0031] From the above description, it can be seen that the display substrate and display device provided by the present application can enable the overlapping part formed by the first part of the power supply line arranged on the same layer as the third source and drain layer and the second part of the power supply line arranged on the same layer as the second source and drain layer to be completely covered by the inorganic packaging layer, thereby preventing the overlapping part from being covered by organic film layers such as the third flat layer, cutting off the path for water vapor entering from the third flat layer to invade the third source and drain layer at the source, and avoiding problems such as black spots caused by the transmission of water vapor to the display area to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1a FIG. 1 is a schematic diagram of the structure of an exemplary display substrate before bending.

[0034] Figure 1b FIG. 1 is a schematic diagram of an exemplary structure of a display substrate after bending.

[0035] Figure 2a is a schematic diagram of an exemplary display substrate.

[0036] Figure 2b for Figure 2a Enlarged view of point A in the middle.

[0037] Figure 2c for Figure 2b Cross-section along BB' direction.

[0038] Figure 2d for Figure 2b Cross-sectional view along AA' direction.

[0039] Figure 2e This is a cross-sectional view along CC' in 2b.

[0040] Figure 3 This is a schematic cross-sectional view of a display substrate according to an embodiment of the present application.

[0041] Figure 4 Schematic diagram of the distribution of multiple power supply lines on a display substrate according to an embodiment of the present application.

[0042] Figure 5a This is a top view of a display substrate according to an embodiment of the present application.

[0043] Figure 5b for Figure 5a Cross-sectional view along CC' direction.

[0044] Figure 6a This is a top view of another display substrate according to an embodiment of the present application.

[0045] Figure 6b for Figure 6a Cross-sectional view along CC' direction.

[0046] Figure 7a This is a top view of another display substrate according to an embodiment of the present application.

[0047] Figure 7b for Figure 7a Cross-sectional view along CC' direction.

[0048] Description of reference numerals:

[0049] 1-substrate; 11-display area; 12-non-display area; 121-first peripheral area; 122-bending area; 123-second peripheral area; 124-bonding pad area; 23-first source / drain layer; 21-second source / drain layer; 22-third source / drain layer; 311-overlapping portion; 241-slope angle; 242-residual adhesive; 25-vdd trace; 26-vss trace; 27-first portion; 28-second portion; 32-first flat layer; 31-second flat layer; 33-third flat layer; 4-pixel definition layer; 5 1-first trench; 52-second trench; 53-third trench; 61-first barrier wall; 62-second barrier wall; 7-inorganic encapsulation layer; E-inorganic encapsulation layer boundary; 71-first inorganic encapsulation layer; 72-second inorganic encapsulation layer; 73-organic encapsulation layer; 81-inorganic buffer layer; 82-touch insulation layer; F-inorganic layer boundary; 83-first touch metal layer; 84-second touch metal layer; 85-organic layer; G-organic layer boundary; X-second direction; Y-first direction; Z-water vapor intrusion path; 9-luminescent functional layer. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0051] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] Figure 1a to Figure 1b 1 shows a front view of an exemplary display substrate before and after bending. Figure 1a FIG. 4 shows a schematic structural diagram of an exemplary display substrate before bending. Figure 1b Shows the Figure 1a Schematic diagram of the structure of an exemplary display substrate after bending.

[0053] like Figure 1a As shown, the display substrate may include four frames: upper, lower, left, and right. Among them, the lower frame is the largest. In order to reduce the frame of the display substrate, a pad bending technology can be used on the lower frame of the display surface to bend a part of the lower frame (such as a part of the flexible circuit board) to the back of the display substrate, so as to obtain Figure 1b .

[0054] Figure 2a-2d A schematic diagram of another exemplary display substrate is shown. Figure 2a FIG. 4 is a front view of an exemplary display substrate. Figure 2b for Figure 2a Enlarged view of point A in the middle. Figure 2c for Figure 2b Cross-section along BB' direction. Figure 2d for Figure 2b Cross-sectional view along AA' direction. Figure 2e for Figure 2b Cross-sectional view along CC' direction.

[0055] like Figure 2a 、 Figure 2b and Figure 2cAs shown, in the display substrate bending area, in the related art, in order to reduce costs and increase production capacity, the passivation layer film layer will be eliminated. The source and drain electrode (SD) layer is used to connect to the external circuit. The source and drain electrode (SD) layer only has organic layers such as organic film (PLN) and pixel definition (PDL). Among them, in the source and drain electrode (SD) film layer close to the display area side in the display area, when the upper anode layer is wet-etched by the etching liquid, when the organic layers such as the flat layer (PLN) and the pixel definition layer (PDL) are exposed and developed, the etching liquid will corrode the source and drain electrode (SD) film layer from the side of the source and drain electrode (SD) film layer, causing lateral etching, and a slope angle 241 (undercut) will be formed on the side of the source and drain electrode (SD) film layer. Usually, the source and drain film layer includes a first titanium layer, an aluminum layer and a second titanium layer. Since the etching rate of the etching liquid for metal aluminum is greater than the etching rate of metal titanium when the anode layer is wet-etched, as shown in FIG. Figure 2d As shown, a slope angle 241 (undercut) will be formed in the source and drain (SD) film layer. During exposure and development, the coated photoresist will enter the slope angle 241, and due to the covering of the upper first titanium layer, the photoresist in the slope angle cannot be etched away. Therefore, residual photoresist 242 will be left in the source and drain layer within the slope angle 241 (undercut). Figure 2c As shown, the display substrate will experience GDSX: after the exposed organic film (PLN) and pixel definition (PDL) in the bending area absorb water vapor, the water vapor will be transmitted to the display area 11 through the residual glue 242 in the slope angle 241 (undercut), forming the following Figure 2b and Figure 2c The water vapor intrusion path Z shown is transmitted to the light-emitting functional layer, causing material failure and the appearance of black spots, thus causing a reliability GDSX problem.

[0056] In view of this, the embodiment of the present application changes the position of the overlapping portion of the display substrate used to connect the source and drain layers in the display area and the bending area, thereby avoiding the source and drain electrode layers in the display area from being covered by organic film layers such as PLN, so that the inorganic encapsulation layer can completely cover the edges of the source and drain electrode layers, isolating water vapor from the source from entering the residual glue 242 in the SD slope angle 241 (undercut), thereby improving GDSX.

[0057] like Figure 3 As shown, Figure 2b Another cross-sectional view along the BB' direction. Figure 3 and Figure 4The embodiment of the present application provides a display substrate, which may include: a display area 11 and a non-display area 12 surrounding the display area 11, wherein the non-display area 12 includes a first peripheral area 121, a bending area 122, a second peripheral area 123, and a bonding pad area 124 arranged in sequence in a direction away from the display area. The display substrate may include:

[0058] Base substrate 1;

[0059] A first source and drain layer 23 is provided on the base substrate 1;

[0060] A first planar layer 32 is provided on a side of the first source and drain layer 23 away from the base substrate 1;

[0061] A second source and drain electrode layer 21 is provided on a side of the first planar layer 32 away from the base substrate;

[0062] A second planar layer 31 is provided on a side of the second source / drain electrode layer 21 away from the base substrate 1;

[0063] A third planar layer 33 is provided on a side of the third source / drain electrode layer 22 away from the substrate 1;

[0064] See Figure 5b As shown, the display substrate includes a power supply line, which includes a first portion 27 located in the first peripheral area 121 and a second portion 28 located at least in the first peripheral area and the bend area. The first portion 27 is provided in the same layer as the third source and drain layer 22, and the second portion 28 is provided in the same layer as the second source and drain layer 21. Generally, "provided in the same layer" can be understood as: the first portion 27 of the power supply line and the third source and drain layer 22 are formed simultaneously through the same process, and the first portion 27 of the power supply line and the third source and drain layer 22 are made of the same material. Furthermore, the second portion 28 of the power supply line and the second source and drain layer 21 are formed simultaneously through the same process, and the second portion 28 of the power supply line and the second source and drain layer 21 are made of the same material.

[0065] A first barrier wall 61 is disposed in the first peripheral region 121 and surrounds the display region 11. The first barrier wall 61 is disposed on the same layer as at least one of the first flat layer 32, the second flat layer 31, and the third flat layer 33. A first trench 51 is disposed between the first barrier wall 61 and the bending region 122. The orthographic projection of the first trench 51 on the base substrate 1 does not overlap with the orthographic projections of the first flat layer 32, the second flat layer 31, and the third flat layer 33 on the base substrate 1.

[0066] an inorganic encapsulation layer 7 , which is disposed on a side of the first barrier wall 61 away from the base substrate 1 and covers the first barrier wall 61 ; the inorganic encapsulation layer covers the display area 11 and at least a portion of the first peripheral area 121 ;

[0067] The first portion 27 and the second portion 28 overlap in a direction perpendicular to the substrate and are in direct contact and electrical connection. Figure 5a As shown, an overlapping portion 311 is formed; the orthographic projection of the overlapping portion 311 on the base substrate 1 is located within the orthographic projection of the first groove 51 on the base substrate 1 .

[0068] The display substrate of the embodiment of the present application can enable the third source and drain layer 22 to be completely covered by the inorganic encapsulation layer, thereby preventing the third source and drain layer 22 from being covered by organic film layers such as the second flat layer 31, and cutting off the path Z for water vapor entering from the second area of ​​the second flat layer 31 to invade the third source and drain layer 22 at the source, thereby avoiding problems such as black spots caused by the transmission of water vapor to the display area 11 to a certain extent.

[0069] In some embodiments, the base substrate 1 may be a flexible substrate, for example, a plate-like structure made of a polymer such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PED), polyarylate (PAR) or glass fiber reinforced plastic (FRP). It may include a display area 11 and a non-display area 12 surrounding the display area 11. Typically, the display area 11 is an area for realizing a display function, and the non-display area 12 is an area where display cannot be performed, and is typically located on the periphery of the display area 11. The first peripheral area 121 may be a continuous closed area surrounding the outside of the display area, and the bending area 122 and the second peripheral area 123 may be areas obtained by partially extending outward from the first peripheral area 121. Typically, the binding pad area is provided with a binding pin pad.

[0070] In some embodiments, a first source-drain layer 23 may be provided on the base substrate 1. The first source-drain layer 23 may be located in the display area 11 and a portion of the first peripheral area 121. A second portion 28 of a power supply line provided on the same layer as the second source-drain layer 21 may extend from the bending area 122 to the first peripheral area 121. A third source-drain layer 22 may extend from the first peripheral area 121 to the display area 11, with a first portion 27 of the power supply line provided on the same layer as the third source-drain layer 22 located in the first peripheral area. Thus, by providing three source-drain layers, namely the first source-drain layer 23, the second source-drain layer 21, and the third source-drain layer 22, image quality can be further improved.

[0071] In some embodiments, the second source-drain electrode layer 21, the third source-drain electrode layer 22, and the first source-drain electrode layer 23 may each be a composite layer structure of titanium / aluminum / titanium, that is, the second source-drain electrode layer 21, the third source-drain electrode layer 22, and the first source-drain electrode layer 23 may be a metal structure of Ti (titanium) / Al (aluminum) / Ti stacked. Figure 2d As shown in Figure 2, the power supply traces can also use a Ti (titanium) / Al (aluminum) / Ti stacked metal structure. The titanium layer provides some protection against corrosion.

[0072] In some embodiments, the first planarizing layer 32 is used to planarize the first source / drain layer 23 and to achieve insulation to a certain extent, thereby preventing short circuits between the first source / drain layer 23 and the second source / drain layer 21. The second planarizing layer 31 is used to planarize the second source / drain layer 21 and to achieve insulation to a certain extent, thereby preventing short circuits between the second source / drain layer 21 and the third source / drain layer 22. The third planarizing layer 33 is used to planarize the third source / drain layer 22 to facilitate the subsequent preparation of the pixel defining layer 4. That is, the first source / drain layer 23 is disposed on a side of the second source / drain layer 21 close to the base substrate 1. The first planarizing layer 32 is disposed between the second source / drain layer 21 and the first source / drain layer 23. The second planarizing layer 31 is disposed between the second source / drain layer 21 and the third source / drain layer 22.

[0073] In some embodiments, such as Figure 4 As shown, the power supply lines include a plurality of first power supply lines and a plurality of second power supply lines. Typically, the plurality of first power supply lines are electrically connected as a whole. For example, a connection portion can be provided on the side close to the display area to achieve electrical connection as a whole. The plurality of second power supply lines are electrically connected as a whole. The second power supply line surrounds the outside of the display area and passes through the first peripheral area. The bending area extends into the second peripheral area. The first power supply line is located within the range surrounded by the second power supply line. The plurality of first power supply lines are spaced apart in the second direction X; the second direction X is parallel to the surface of the substrate and perpendicular to the first direction Y; the overlapping portion 311 is provided on the first power supply line at at least one end of the second direction X.

[0074] In some embodiments, the plurality of first power lines may include a plurality of vdd lines 25 spaced apart. The plurality of second power lines may include a plurality of vss lines 26. The plurality of vdd lines 25 may include two vdd lines 25 disposed at ends of the second direction X and a plurality of spaced apart vdd lines 25 disposed between the two vdd lines 25. There may be at least one overlapping portion 311, with the at least one overlapping portion 311 being located at a position corresponding to the position of a first power line (e.g., vdd line 25) disposed at one end of the second direction X. There may also be at least two overlapping portions 311, with the at least two overlapping portions 311 being located at positions corresponding to the positions of first power lines disposed at both ends of the second direction X. Since the reliability GDSX problem primarily occurs at positions corresponding to the first power lines disposed at both ends of the second direction X, providing the overlapping portions at the first power lines at both ends of the second direction X can, to a certain extent, avoid the reliability GDSX problem.

[0075] In some embodiments, the overlapping portion 311 can also be set to multiple, and the setting positions of the multiple overlapping portions 311 correspond one-to-one to the setting positions of the multiple vdd traces 25, and a corresponding overlapping portion is also provided at each vss trace 26. That is, the number of overlapping portions 311 provided can be the same as the sum of the number of vdd traces 25 and the number of vss traces 26 in the power traces. Each of the first power traces (for example, the vdd trace 25) is provided with the overlapping portion 311. And each of the second power traces (for example, the vss trace 26) is provided with the overlapping portion 311. In this way, the reliability GDSX problem can be better avoided. And the process can be simplified to a certain extent.

[0076] In some of these embodiments, reference Figure 5a-Figure 7b As shown, the orthographic projection of the first part 27 on the base substrate 1 extends along the first direction Y, and the orthographic projection of the second part 28 on the base substrate 1 extends along the first direction Y. The first direction Y is the direction extending from the display area to the bending area; the second direction X is perpendicular to the first direction Y. Along the second direction X, the orthographic projection of the first part 27 on the base substrate 1 at least partially covers the orthographic projection of the second part 28 on the base substrate 1. That is, the width of the first part 27 is at least a part of the width of the second part 28, which can be less than the width of the second part 28, or equal to the width of the second part 28, or greater than the width of the second part 28. For the inorganic encapsulation layer, it has the following Figure 5a , Figure 6a and Figure 7aThe inorganic encapsulation layer boundary E shown. For the inorganic layer in the touch layer (such as the inorganic buffer layer 81 or the touch insulating layer 82), it has the following Figure 5a , Figure 6a and Figure 7a As shown in the inorganic layer boundary F. For the organic layer 85, there is Figure 5a , Figure 6a and Figure 7a The organic layer boundary G is shown.

[0077] In some embodiments, such as Figure 5a and Figure 5b As shown, along the second direction X, the orthographic projection of the first portion 27 on the substrate 1 can overlap the orthographic projection of the second portion 28 on the substrate 1. It can be understood that, in the second direction X, the edge of the orthographic projection of the first portion 27 on the substrate 1 can overlap (e.g., exactly overlap) the edge of the orthographic projection of the second portion 28 on the substrate 1. In other words, at least a portion of the orthographic projection of the first portion 27 on the substrate along the first direction Y is aligned with at least a portion of the orthographic projection of the second portion 28 on the substrate along the first direction Y. The line width of at least a portion of the first portion 27 and the line width of at least a portion of the second portion 28 can be the same.

[0078] In some embodiments, such as Figure 6a and Figure 6b As shown, along the second direction X, the orthographic projection of the first portion 27 on the substrate 1 may exceed the orthographic projection of the second portion 28 on the substrate 1. It can be understood that, in the second direction X, at least part of the edge of the orthographic projection of the first portion 27 on the substrate 1 may cover (for example, completely cover) the edge of the orthographic projection of the second portion 28 on the substrate 1. That is, at least part of the edge of the orthographic projection of the first portion 27 on the substrate 1 covers (that is, exceeds) the edge of the orthographic projection of the second portion 28 on the substrate 1, and the line width of at least part of the first portion 27 is greater than the line width of the second portion 28. In this way, the depth of the undercut 241 structure of the source and drain layer can be avoided to a certain extent, thereby avoiding the occurrence of crack defects in the inorganic encapsulation layer.

[0079] In some embodiments, such as Figure 7a and Figure 7bAs shown, along the second direction X, the orthographic projection of the first portion 27 on the substrate 1 may be located within the orthographic projection of the second portion 28 on the substrate 1. It can be understood that, in the second direction X, the edge of the orthographic projection of the first portion 27 on the substrate 1 may only partially cover the edge of the orthographic projection of the second portion 28 on the substrate 1. That is, the edge of the orthographic projection of the first portion 27 on the substrate 1 is located within the edge of the orthographic projection of the second portion 28 on the substrate 1 (that is, the edge of the orthographic projection of the first portion 27 on the substrate 1 is inward compared to the edge of the orthographic projection of the second portion 28 on the substrate 1), and the line width of the first portion 27 is smaller than the line width of the second portion 28. That is, along the second direction X, at least part of the orthographic projection of the second portion 28 on the substrate exceeds the orthographic projection of the first portion 27 on the substrate. In this way, the depth of the undercut 241 structure of the source and drain layer can be avoided to a certain extent, thereby avoiding cracking of the inorganic encapsulation layer.

[0080] In some embodiments, the display substrate may further include a pixel defining layer 4 and a light-emitting functional layer 9 stacked in a direction away from the base substrate 1. The light-emitting functional layer 9 is arranged on the side of the third flat layer 33 away from the base substrate 1, located in the display area 11. Generally, the light-emitting functional layer 9 may include an anode layer, a light-emitting layer and a cathode layer stacked in a direction away from the base substrate 1. The pixel defining layer 4 may include a plurality of openings, which divide the anode layer, the light-emitting layer and the cathode layer into a plurality of sub-pixels. The orthographic projection of the inorganic encapsulation layer on the base substrate 1 may cover the orthographic projection of the light-emitting functional layer 9 on the base substrate 1. The pixel defining layer 4, the second flat layer 31 and the third flat layer 33 may all be organic film layers. The orthographic projection of the pixel defining layer 4 on the base substrate 1 does not overlap with the orthographic projection of the first trench 51 on the base substrate 1.

[0081] In some embodiments, the display substrate may further include an organic encapsulation layer 73; the inorganic encapsulation layer may include a first inorganic encapsulation layer 71 and a second inorganic encapsulation layer 72 stacked together, with the second inorganic encapsulation layer 72 disposed on a side of the first inorganic encapsulation layer 71 away from the base substrate 1; and the organic encapsulation layer 73 may be disposed between the first inorganic encapsulation layer 71 and the second inorganic encapsulation layer 72. Typically, the organic encapsulation layer 73 may be located in the display area 11 and a portion of the first peripheral area 121, and its orthographic projection on the base substrate 1 may cover the light-emitting functional layer 9.

[0082] In some embodiments, the display substrate may further include a second barrier wall 62. The second barrier wall 62 may be disposed on a side of the first barrier wall 61 closer to the display area 11. Typically, the height of the second barrier wall 62 may be lower than that of the first barrier wall 61. The second barrier wall 62 may be disposed on the same layer as at least one of the first planar layer, the second planar layer, the third planar layer, and the pixel definition layer. A second trench may be disposed between the second barrier wall and the first barrier wall. The orthographic projection of the second trench on the base substrate does not overlap with the orthographic projections of the first planar layer, the second planar layer, the third planar layer, and the pixel definition layer on the base substrate.

[0083] In some embodiments, a third trench may be provided between the second barrier wall and the display area; the orthographic projection of the third trench on the base substrate does not overlap with the orthographic projections of the first flat layer, the second flat layer, the third flat layer, and the pixel definition layer on the base substrate. Typically, during the preparation of the display substrate, when the organic encapsulation layer 73 is formed using an inkjet printing process, the first barrier wall 61 and the second barrier wall 62 may prevent the organic encapsulation layer 73 from overflowing. The first barrier wall may be provided on the same layer as the third flat layer 33 and the pixel definition layer; the second barrier wall may be provided on the same layer as the third flat layer 33 and the pixel definition layer. Typically, when forming the first barrier wall 61 and the second barrier wall 62, it is necessary to perform trenching on the organic film layers including the first flat layer, the second flat layer 31, the third flat layer, and the pixel definition layer 4 to form the first trench 51, the second trench 52, and the third trench 53. Therefore, the second planar layer 31 and the pixel defining layer 4 can include a portion located in the display area 11 and portions located in the first peripheral area 121 and the bending area 122. The first barrier wall 61 and the second barrier wall 62 can be located between these two portions. By trenching during the formation of the first barrier wall 61 and the second barrier wall 62, the uncovered organic film layer in the bending area 122 is disconnected from the organic film layer in the display area 11. This can prevent external water and oxygen from invading the display area 11 through the uncovered organic film layer (e.g., the second planar layer 31), achieving a better encapsulation effect. This can effectively prevent the transmission of water vapor in the organic layer 85.

[0084] In some embodiments, the display substrate may further include a touch layer, which is disposed on a side of the inorganic encapsulation layer away from the base substrate 1. The touch layer may be located in the display area 11 and a portion of the first peripheral area 121. The touch layer may include an inorganic layer, a touch metal layer, and an organic layer 85 stacked in a direction away from the third source and drain layer 22. Typically, the inorganic layer may include an inorganic buffer layer 81 and a touch insulating layer 82. The touch metal layer may include a first touch metal layer (TMA) 83 and a second touch metal layer (TMB) 84. The inorganic buffer layer 81 is disposed on a side of the inorganic encapsulation layer (e.g., the second inorganic encapsulation layer 72) away from the base substrate 1, for flattening the inorganic encapsulation layer (e.g., the second inorganic encapsulation layer 72). The touch insulating layer 82 may be disposed on a side of the first touch metal layer (TMA) 83 away from the base substrate 1, for flattening the first touch metal layer (TMA) 83. The organic layer 85 is disposed on the side of the second touch metal layer (TMB) 84 away from the base substrate 1 to protect the second touch metal layer (TMB) 84. Typically, the orthographic projection of the inorganic layer on the base substrate 1 can overlap the orthographic projection of the inorganic encapsulation layer on the base substrate 1. This allows the inorganic layer to better cover the edge of the second portion 28 near the bend region 122, thereby effectively blocking the path for moisture entering from the second region of the second planar layer 31 to intrude into the third source and drain layer 22. The edge of the organic layer 85 on the side away from the display area 11 can extend beyond the edge of the touch insulation layer 82 on the side away from the display area 11, and the orthographic projection of the organic layer 85 on the base substrate 1 can overlap the orthographic projection of the second inorganic encapsulation layer 72 on the base substrate 1. That is, the orthographic projection of the inorganic layer on the base substrate 1 overlaps the orthographic projection of the inorganic encapsulation layer on the base substrate 1; and the orthographic projection of the organic layer 85 on the base substrate 1 overlaps the orthographic projection of the inorganic layer on the base substrate 1.

[0085] 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 may include the display substrate described in any of the above embodiments. The display device may be any appropriate display device, including but not limited to in-vehicle displays, bank terminal displays, mobile phones, tablet computers, televisions, monitors, laptop computers, digital photo frames, navigation systems, e-books, and any other product or component with a display function.

[0086] The device of the above embodiment includes the corresponding display substrate in any of the above embodiments, and has the beneficial effects of the corresponding display panel embodiment, which will not be described in detail here.

[0087] The method for preparing the display substrate of the above embodiment is used to prepare the corresponding display substrate of any of the above embodiments, and has the beneficial effects of the corresponding display substrate embodiment, which will not be described in detail here.

[0088] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0089] In addition, for simplicity of description and discussion, and in order not to make the embodiment of the application difficult to understand, the known power supply / ground connection with integrated circuit (IC) chip and other components may or may not be shown in the accompanying drawings provided. In addition, the device can be shown in the form of a block diagram to avoid making the embodiment of the application difficult to understand, and this also takes into account the following fact, that is, the details of the embodiment of these block diagram devices are highly dependent on the platform to be implemented in the embodiment of the application (that is, these details should be fully within the scope of understanding of those skilled in the art). When specific details (for example, circuit) are set forth to describe exemplary embodiments of the application, it will be apparent to those skilled in the art that the embodiment of the application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0090] Although the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may utilize the embodiments discussed.

[0091] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A display substrate, characterized in that: include: substrate; The base substrate has a display area and a non-display area surrounding the display area, wherein the non-display area includes a first peripheral area, a bending area, and a second peripheral area sequentially arranged in a direction away from the display area; A first source and drain layer is provided on the base substrate; a first planarization layer, disposed on a side of the first source and drain electrode layer away from the base substrate; a second source-drain electrode layer, disposed on a side of the first planar layer away from the base substrate; a second planarization layer, disposed on a side of the second source / drain electrode layer away from the base substrate; a third source-drain electrode layer, arranged on a side of the second planar layer away from the base substrate; a third planarization layer, disposed on a side of the third source and drain electrode layer away from the substrate; The display substrate includes a power supply line, the power supply line including a first portion located in the first peripheral area and a second portion located at least in the first peripheral area and the bending area; the first portion is disposed in the same layer as the third source and drain layer, and the second portion is disposed in the same layer as the second source and drain layer; a first barrier wall disposed in the first peripheral area and surrounding the display area; the first barrier wall being disposed on the same layer as at least one of the first flat layer, the second flat layer, and the third flat layer; a first trench being disposed between the first barrier wall and the bending area, wherein an orthographic projection of the first trench on the base substrate does not overlap with an orthographic projection of the first flat layer, the second flat layer, and the third flat layer on the base substrate; an inorganic encapsulation layer, disposed on a side of the first barrier wall away from the base substrate, and covering the first barrier wall; The first portion and the second portion overlap in a direction perpendicular to the base substrate and are in direct contact and electrically connected to form an overlapping portion; the orthographic projection of the overlapping portion on the base substrate is within the orthographic projection of the first groove on the base substrate.

2. The display substrate according to claim 1, wherein: The first part extends along a first direction, and the second part extends along the first direction; the orthographic projection of the first part on the base substrate at least partially covers the orthographic projection of the second part on the base substrate; wherein, the first direction is a direction extending from the display area to the bending area; the second direction is perpendicular to the first direction.

3. The display substrate according to claim 2, wherein: Along the second direction, at least a portion of the orthographic projection of the first portion on the substrate exceeds the orthographic projection of the second portion on the substrate.

4. The display substrate according to claim 2, wherein: Along the second direction, at least a portion of the orthographic projection of the second portion on the substrate exceeds the orthographic projection of the first portion on the substrate.

5. The display substrate according to claim 2, wherein: At least a portion of a boundary where the orthographic projection of the first portion on the substrate extends along the first direction is flush with at least a portion of a boundary where the orthographic projection of the second portion on the substrate extends along the first direction.

6. The display substrate according to claim 2, wherein: The power supply lines include a plurality of first power supply lines and a plurality of second power supply lines extending along the first direction; the plurality of first power supply lines and the plurality of second power supply lines are spaced apart in the second direction, and the first power supply line is arranged between the plurality of second power supply lines; the overlapping portion is arranged on the first power supply line at at least one end of the second direction.

7. The display substrate according to claim 6, wherein: Each of the first power supply lines is provided with the overlapping portion; each of the second power supply lines is provided with the overlapping portion.

8. The display substrate according to claim 7, wherein: The display substrate also includes a pixel defining layer and a light-emitting function layer stacked on the side of the third flat layer away from the base substrate; the light-emitting function layer is located in the display area; the orthographic projection of the pixel defining layer on the base substrate does not overlap with the orthographic projection of the first groove on the base substrate.

9. The display substrate according to claim 8, wherein: The display substrate also includes an organic encapsulation layer; the orthographic projection of the organic encapsulation layer on the base substrate covers the orthographic projection of the light-emitting functional layer on the base substrate; the inorganic encapsulation layer includes a first inorganic encapsulation layer and a second inorganic encapsulation layer arranged in a stacked manner, and the second inorganic encapsulation layer is arranged on the side of the first inorganic encapsulation layer away from the base substrate; the organic encapsulation layer is arranged between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

10. The display substrate according to claim 9, wherein: The display substrate further includes a second barrier wall; the second barrier wall is disposed on a side of the first barrier wall close to the display area; the second barrier wall is disposed on the same layer as at least one of the first flat layer, the second flat layer, the third flat layer, and the pixel defining layer; A second trench is provided between the second barrier wall and the first barrier wall; an orthographic projection of the second trench on the base substrate does not overlap with an orthographic projection of the first flat layer, the second flat layer, the third flat layer and the pixel defining layer on the base substrate; A third trench is provided between the second barrier wall and the display area; the orthographic projection of the third trench on the base substrate does not overlap with the orthographic projections of the first flat layer, the second flat layer, the third flat layer and the pixel defining layer on the base substrate.

11. The display substrate according to claim 1, wherein The first source-drain electrode layer, the second source-drain electrode layer, and the third source-drain electrode layer are respectively a composite layer structure of titanium / aluminum / titanium.

12. The display substrate according to any one of claims 1 to 5, characterized in that: The display substrate also includes a touch layer, which is arranged on a side of the inorganic packaging layer away from the base substrate; the touch layer includes an inorganic buffer layer, a first touch metal layer, a touch insulation layer and a second touch metal layer stacked in a direction away from the base substrate; the orthographic projection of the inorganic buffer layer on the base substrate covers at least part of the orthographic projection of the inorganic packaging layer on the base substrate.

13. The display substrate according to claim 12, wherein: The display substrate further includes an organic layer, which is disposed on a side of the second touch metal layer away from the base substrate; the orthographic projection of the organic layer on the base substrate covers at least a portion of the orthographic projection of the inorganic buffer layer on the base substrate.

14. A display device, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 13.

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