Display substrate, display panel and display device

Abstract

The present application provides a display substrate, a display panel and a display device. The display substrate includes a display area; the display substrate includes a substrate, a pixel driving circuit located on the substrate, a planarization layer located on the side of the pixel driving circuit away from the substrate, a barrier layer located on the side of the planarization layer away from the substrate, and a light-emitting layer located on the side of the barrier layer away from the substrate. The barrier layer is used to block water and oxygen. The light-emitting layer includes a plurality of light-emitting structures located in the display area, the light-emitting structure includes a first electrode, an organic light-emitting material layer located on the side of the first electrode away from the substrate, and a second electrode located on the side of the organic light-emitting material layer away from the substrate; at least the edge of the orthographic projection of the first electrode located in the edge area of ​​the display area on the substrate falls within the orthographic projection of the barrier layer on the substrate, and does not overlap with the edge of the orthographic projection of the barrier layer on the substrate.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to a display substrate, a display panel, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) has the advantages of wide viewing angle, fast response, high contrast, etc., and has been widely used in display devices.

[0003] In the existing display panel, the pixels in the edge region of the display area are prone to failure, resulting in poor display effects in the edge region of the display area and affecting the user experience. Summary of the Invention

[0004] According to a first aspect of an embodiment of the present application, a display substrate is provided. The display substrate includes a display area; the display substrate includes:

[0005] A substrate;

[0006] A pixel driving circuit located on the substrate;

[0007] A planarization layer located on a side of the pixel driving circuit away from the substrate;

[0008] A barrier layer located on a side of the planarization layer away from the substrate, the barrier layer being used to block water and oxygen;

[0009] A light-emitting layer located on a side of the barrier layer away from the substrate, the light-emitting layer including a plurality of light-emitting structures located in the display area, the light-emitting structure including a first electrode, an organic light-emitting material layer located on a side of the first electrode away from the substrate, and a second electrode located on a side of the organic light-emitting material layer away from the substrate; at least the edge of the positive projection of the first electrode in the edge region of the display area on the substrate falls within the positive projection of the barrier layer on the substrate and does not overlap with the edge of the positive projection of the barrier layer on the substrate.

[0010] In one embodiment, the barrier layer includes an inorganic layer.

[0011] In one embodiment, the thickness range of the inorganic layer is 500 Å to 3000 Å.

[0012] In one embodiment, the barrier layer includes a plurality of barrier portions, the barrier portions being annular; at least the edge of the positive projection of each first electrode in the edge region of the display area on the substrate is located between the inner edge and the outer edge of the positive projection of one of the barrier portions on the substrate.

[0013] In one embodiment, the display substrate further includes a pixel defining layer on a side of the barrier layer facing away from the substrate. The pixel defining layer is provided with pixel openings corresponding to the light-emitting structures one by one. The pixel defining layer is located on the first electrode, and a part of the corresponding first electrode is exposed through the pixel opening.

[0014] The barrier layer includes a plurality of block structures. The orthographic projection of each block structure on the substrate falls within the orthographic projection of the bottom of one of the pixel openings on the substrate, and the area of the orthographic projection of the block structure on the substrate is smaller than the area of the orthographic projection of the bottom of the corresponding pixel opening on the substrate.

[0015] In one embodiment, the display substrate further includes a pixel defining layer on a side of the barrier layer facing away from the substrate. The pixel defining layer is provided with pixel openings corresponding to the light-emitting structures one by one. The pixel defining layer is located on the first electrode, and a part of the corresponding first electrode is exposed through the pixel opening.

[0016] A recess is provided on a side of the planarization layer facing away from the substrate. The part of the first electrode exposed through the pixel opening includes a first electrode portion located at the bottom of the recess and a second electrode portion located on a side surface of the recess.

[0017] In one embodiment, the barrier layer includes a plurality of block structures. The orthographic projection of each block structure on the substrate falls within the orthographic projection of one of the first electrode portions on the substrate, and the area of the orthographic projection of the block structure on the substrate is smaller than the area of the orthographic projection of the corresponding first electrode portion on the substrate.

[0018] In one embodiment, the light-emitting layer includes the light-emitting structures of at least three different light-emitting colors, and the shapes of the block structures corresponding to the light-emitting structures of different light-emitting colors are the same or different; and / or,

[0019] The barrier layer includes a plurality of barrier portions, and the barrier portions are annular. The edge of the orthographic projection of each first electrode at least located in the edge area of the display area on the substrate is located between the inner edge and the outer edge of the orthographic projection of one of the barrier portions on the substrate. The block structure corresponding to at least one first electrode is located within its corresponding barrier portion and there is a gap between the block structure and the barrier portion, and the first electrode is electrically connected to the pixel driving circuit through the gap between the barrier portion and the block structure.

[0020] According to a second aspect of the embodiments of the present application, a display panel is provided. The display panel includes the above-mentioned display substrate.

[0021] According to a third aspect of the embodiments of the present application, a display device is provided. The display device includes the above-mentioned display panel, as well as a packaging layer and a color filter layer located on the display substrate.

[0022] The main technical effects achieved by the embodiments of the present application are as follows:

[0023] For the display substrate, display panel and display device provided by the embodiments of the present application, since the barrier layer for blocking water and oxygen is located between the planarization layer and the first electrode, when water and oxygen in the planarization layer invade the organic light-emitting material layer of the light-emitting structure where the first electrode is located, they must first bypass the barrier layer; since the edge of the positive projection of the first electrode of the light-emitting structure in the edge region of the display area on the substrate falls within the positive projection of the barrier layer on the substrate and does not overlap with the edge of the positive projection of the barrier layer on the substrate, the barrier layer can increase the path of water and oxygen in the planarization layer invading the organic light-emitting material layer of the light-emitting structure in the edge region, which helps to reduce the amount of water and oxygen in the planarization layer invading the organic light-emitting material layer in the edge region of the display area, thereby helping to improve the lifespan of the light-emitting structure in the edge region of the display area, ensuring the display effect of the display substrate, and enhancing the reliability of the display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a partial cross-sectional view of a display substrate provided by an exemplary embodiment of the present application;

[0025] Figure 2 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0026] Figure 3 is a partial structural schematic diagram of a display substrate provided by an exemplary embodiment of the present application;

[0027] Figure 4 is a partial structural schematic diagram of a display substrate provided by another exemplary embodiment of the present application;

[0028] Figure 5 is a flowchart of a method for manufacturing a display substrate provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0030] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the", and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to a determination".

[0032] As described in the background art, the pixels located in the edge region of the display area are prone to failure, affecting the display effect of the display panel. The inventors have found through research that the reason for this problem is as follows: during the preparation of the display panel, after forming the pixel driving circuit, a planarization layer is formed on the pixel driving circuit. In order to facilitate the connection between the subsequently formed anode and the pixel driving circuit, holes need to be drilled in the planarization layer. During the preparation of the display panel, the water vapor in the planarization layer around the holes can escape through the holes. Since only the part of the planarization layer located in the display area needs to be drilled, the planarization layer in the border area surrounding the display area does not need to be drilled, and during the preparation of the display panel, the water vapor in the planarization layer in the border area cannot escape. When the display panel is used for a long time, or under high-temperature conditions or when exposed to light, the water vapor in the planarization layer in the border area will invade the organic light-emitting material of the sub-pixels in the edge region (the area where the display area is adjacent to the border area) of the display area, resulting in the failure of the sub-pixels.

[0033] To solve the above technical problems, embodiments of this application provide a display substrate, a display panel, and a display device. The following will describe the display substrate, the display panel, and the display device in embodiments of this application in detail with reference to the accompanying drawings. Without conflict, the features in the following embodiments can be supplemented or combined with each other.

[0034] Embodiments of this application provide a display substrate. The display substrate includes a display area and a border area surrounding the display area. Refer to Figure 1 And Figure 2, the display substrate 100 includes a substrate 10, a pixel driving circuit 20 located on the substrate, a planarization layer 54 located on a side of the pixel driving circuit 20 away from the substrate 10, a barrier layer 30 located on a side of the planarization layer 54 away from the substrate 10, and a light-emitting layer located on a side of the barrier layer 30 away from the substrate 10.

[0035] The barrier layer 30 is used to block water and oxygen. The light-emitting layer includes a plurality of light-emitting structures 40 located in the display area. The light-emitting structure 40 includes a first electrode 41, an organic light-emitting material layer 42 located on a side of the first electrode 41 away from the substrate 10, and a second electrode 43 located on a side of the organic light-emitting material layer 42 away from the substrate 10. No light-emitting structures are provided in the border area. At least the edge of the positive projection of the first electrode 41 on the substrate 10 in the display area falls within the positive projection of the barrier layer 30 on the substrate 10 and does not overlap with the edge of the positive projection of the barrier layer 30 on the substrate 10. The edge area of the display area is the area adjacent to the border area of the display area. Light-emitting structures (i.e., sub-pixels) are provided in the edge area of the display area, and the light-emitting structures in the edge area of the display area emit light when the display substrate is displaying.

[0036] Among them, the edge of the positive projection of the first electrode 41 on the substrate 10 falls within the positive projection of the barrier layer 30 on the substrate 10 and does not overlap with the edge of the positive projection of the barrier layer 30 on the substrate 10, which means that the barrier layer 30 extends beyond the edge of the first electrode 41 in the extending direction of the substrate 10.

[0037] Among them, the edge area of the display area refers to the area where the display area is adjacent to the border area. The first electrode in this edge area is adjacent to the border area. The width of the edge area can be the width to accommodate one first electrode, or the width to accommodate two or more first electrodes.

[0038] The display substrate provided by the embodiment of the present application, since the barrier layer 30 for blocking water and oxygen is located between the planarization layer 54 and the first electrode 41, when the water and oxygen in the planarization layer 54 invade the organic light-emitting material layer of the light-emitting structure where the first electrode 41 is located, they must first bypass the barrier layer 30; since the edge of the positive projection of the first electrode 41 of the light-emitting structure 40 in the edge region of the display area on the substrate falls within the positive projection of the barrier layer 30 on the substrate and does not overlap with the edge of the positive projection of the barrier layer on the substrate 10, the barrier layer 30 can increase the path for the water and oxygen in the planarization layer 54 to invade the organic light-emitting material layer of the light-emitting structure 40 in the edge region, which helps to reduce the amount of water and oxygen in the planarization layer 54 invading the organic light-emitting material layer in the edge region of the display area, thereby helping to improve the lifespan of the light-emitting structure in the edge region of the display area, ensuring the display effect of the display substrate, and improving the reliability of the display substrate.

[0039] In one embodiment, in each light-emitting structure 40 of the display substrate, the edge of the positive projection of the first electrode 41 on the substrate 10 falls within the positive projection of the barrier layer 30 on the substrate 10 and does not overlap with the edge of the positive projection of the barrier layer 30 on the substrate 10. With such a setting, the invasion path of the water vapor in the planarization layer 54 to the organic light-emitting material layer of each light-emitting structure 40 is increased, and the lifespan of each light-emitting structure 40 in the display area can be improved.

[0040] In one implementation, the substrate 10 is a rigid substrate, and the material of the rigid substrate can be metal, quartz, etc.

[0041] In one embodiment, the pixel driving circuit 20 includes a thin-film transistor 21 and a capacitor 22. The thin-film transistor 21 includes an active layer 211, a gate electrode 212, a third electrode 213, and a fourth electrode 241. The first electrode 41 of the light-emitting structure 40 is electrically connected to the fourth electrode 214 through a through hole penetrating the planarization layer 54. One of the third electrode 213 and the fourth electrode 214 is a source electrode, and the other is a drain electrode. The capacitor 22 includes a first electrode plate 221 and a second electrode plate 222 disposed opposite to the first electrode plate 221 on the side away from the substrate 10. The first electrode plate 221 and the gate electrode 212 can be located on the same layer and are formed in one patterning process.

[0042] In one embodiment, the display substrate 100 further includes a gate insulating layer 51, a capacitive insulating layer 52, and an interlayer dielectric layer 53. The gate insulating layer 51 is located between the active layer 211 and the gate electrode 212. The capacitive insulating layer 52 is located between the first electrode plate 221 and the second electrode plate 222. The interlayer dielectric layer 53 is located on the side of the second electrode plate 222 facing away from the substrate 10. The third electrode 213 and the fourth electrode 214 are located on the side of the interlayer dielectric layer 53 facing away from the substrate 10, and are electrically connected to the active layer 211 through a via hole penetrating the gate insulating layer 51, the capacitive insulating layer 52, and the interlayer dielectric layer 53. The planarization layer 54 is located on the side of the third electrode 213 and the fourth electrode 214 facing away from the substrate 10, and covers the third electrode 213, the fourth electrode 214, and the exposed interlayer dielectric layer 53.

[0043] In one embodiment, the first electrode 41 of the light-emitting structure 40 is an anode, and the second electrode 43 of the light-emitting structure 40 is a cathode. The second electrodes 43 of the respective light-emitting structures 40 in the display area may be a continuous planar electrode.

[0044] The light-emitting layer may include at least three light-emitting structures 40 with different light-emitting colors. In some embodiments, the light-emitting layer may include three light-emitting structures with different colors, namely a red light-emitting structure, a green light-emitting structure, and a blue light-emitting structure.

[0045] In one embodiment, the display substrate 100 further includes a pixel defining layer 55 located on the side of the barrier layer 30 facing away from the substrate 10. The pixel defining layer 55 is provided with pixel openings 551 corresponding to the light-emitting structures 40 one by one. The pixel defining layer 55 is located on the first electrode 41, and a part of the first electrode 41 of the corresponding light-emitting structure 40 is exposed by the pixel opening 551. From the side close to the substrate 10 to the side facing away from the substrate 10, the opening area of the pixel opening 551 may gradually increase.

[0046] In one embodiment, refer to Figure 2, a recess is provided on a side of the planarization layer 54 facing away from the substrate 10. The portion of the first electrode 41 exposed by the pixel opening 551 includes a first electrode portion 411 located at the bottom of the recess and a second electrode portion 412 located on a side surface of the recess. The bottom of the organic light-emitting material layer 42 is located on the first electrode portion 411; a part of the side portion of the organic light-emitting material layer 42 is located on the side portion of the second electrode portion 412, and another part is located on the side surface of the pixel opening 551. Compared with the case where the entire side portion of the organic light-emitting material layer 42 is located on the side surface of the pixel opening 551, the contact area between the side portion of the organic light-emitting material layer 42 and the pixel defining layer 55 is reduced, which helps to isolate the organic light-emitting material layer from water and oxygen; and the first electrode portion 411 is inclined, which helps to increase the light emission amount of the display substrate at a large viewing angle, thereby improving the brightness of the display substrate at a large viewing angle and improving the color shift phenomenon of the display substrate at a large viewing angle.

[0047] In one embodiment, a plurality of recesses may be provided on a side of the planarization layer facing away from the pixel driving circuit, and the recesses of the planarization layer correspond to the first electrodes 41 one by one. A part of the first electrode 41 is located in the corresponding recess.

[0048] In one embodiment, the barrier layer 30 includes an inorganic layer. The inorganic layer has a good effect of blocking water and oxygen. When the barrier layer 30 includes an inorganic layer, it helps to reduce the amount of water and oxygen in the planarization layer 54 invading the organic light-emitting material layer of the light-emitting structure 40 located in the edge region. In some embodiments, the barrier layer 30 only includes an inorganic layer.

[0049] Further, the material of the inorganic layer in the barrier layer 30 may be silicon nitride, silicon oxide, etc. Preferably, the material of the inorganic layer is silicon nitride, so that the density of the inorganic layer can be better, and it is more helpful to block water and oxygen.

[0050] In one embodiment, the thickness range of the inorganic layer in the barrier layer 30 is 500 Å to 3000 Å. With such a setting, it can avoid the situation that the thickness of the barrier layer 30 is too small, resulting in difficult process implementation and poor water and oxygen blocking effect of the inorganic layer, and can also avoid the situation that the thickness of the barrier layer 30 is too large, resulting in an increase in the thickness of the display substrate. In some embodiments, the thickness of the inorganic layer in the barrier layer 30 is 500 Å, 1000 Å, 1500 Å, 2000 Å, 2500 Å, 3000 Å, etc.

[0051] In one embodiment, refer to Figure 3 and Figure 4, the barrier layer 30 includes a plurality of barrier portions 31, and the barrier portions 31 are annular. The edges of the orthographic projections of the first electrodes 41 on the substrate 10, at least those located in the edge region of the display area, are located between the inner edge and the outer edge of the orthographic projection of one of the barrier portions 31 on the substrate 10. With such an arrangement, when the water and oxygen escaping from the planarization layer invade the organic light-emitting material layer from various positions, they all need to bypass the edge of the barrier portion 31. That is, the paths for the water and oxygen escaping from the planarization layer to invade the organic light-emitting material layer from various positions are all increased, which is more conducive to blocking the invasion of water and oxygen and improving the reliability of the display substrate.

[0052] In one embodiment, the edge of the bottom of the pixel opening 551 of the pixel defining layer 55 (that is, the side of the pixel opening 551 close to the substrate 10) in the orthographic projection on the substrate 10 is located inside the inner edge of the orthographic projection of the corresponding barrier portion 31 on the substrate 10. That is, there is no overlap between the orthographic projection of the pixel opening 551 of the pixel defining layer 55 on the substrate 10 and the orthographic projection of the corresponding barrier portion 31 on the substrate 10.

[0053] In one embodiment, the barrier portions 31 correspond one-to-one with the light-emitting structures 40 of the display substrate. The orthographic projection of the first electrode 41 of each light-emitting structure 40 on the substrate 10 is located between the inner edge and the outer edge of the orthographic projection of the corresponding barrier portion 31 on the substrate 10. Thus, the paths for the water and oxygen escaping from the planarization layer to invade each light-emitting structure 40 from various positions are all increased, which is more conducive to improving the reliability of the display substrate.

[0054] In one embodiment, referring again to Figures 1 to 4 , the barrier layer 30 includes a plurality of block structures 32. The orthographic projection of each block structure 32 on the substrate 10 falls within the orthographic projection of the bottom of one of the pixel openings 551 on the substrate 10, and the area of the orthographic projection of the block structure 32 on the substrate 10 is smaller than the area of the orthographic projection of the bottom of the corresponding pixel opening 551 on the substrate 10. The pixel opening 551 corresponding to the block structure 32 refers to the pixel opening 551 whose orthographic projection on the substrate 10 overlaps with the orthographic projection of the block structure 32 on the substrate 10.

[0055] Since the block structure 32 is located below the first electrode 41, and the orthographic projection of the block structure 32 on the substrate 10 falls within the orthographic projection of the bottom of the corresponding pixel opening 551 on the substrate 10, and the area of the block structure 32 is smaller than the area of the bottom of the corresponding pixel opening 551, the light-emitting structure can be made to bulge in the region corresponding to the block structure 32 in the stacking direction of the film layers. Among the light rays emitted from the side of the bulging region of the light-emitting structure 40, at least some of the light rays can be emitted from the side surface of the display substrate. In this way, the amount of light emitted from the display substrate at a large viewing angle can be increased, thereby improving the brightness of the display substrate at a large viewing angle and alleviating the color shift phenomenon of the display substrate at a large viewing angle. Moreover, in the existing solution, the surface of the first electrode facing away from the substrate is irregularly uneven. When the ambient light incident on the display substrate in the black screen state is reflected by the internal structure and then passes through the color resist of the color film layer above the display substrate, color separation will occur. In the embodiments of the present application, by providing the block structure 32, the trajectory of the reflected light after the ambient light incident on the display substrate in the black screen state is reflected by the internal structure can be changed, which also helps to reduce the color shift phenomenon generated in the black screen state of the display substrate.

[0056] Figure 3 and Figure 4 In the embodiment shown, the block structure 32 is strip-shaped. In other embodiments, the block structure 32 can be circular, triangular or other shapes.

[0057] In some embodiments, as Figure 3 shown, one first electrode 41 corresponds to one block structure 32. In some embodiments, one first electrode 41 corresponds to two or more block structures 32.

[0058] In one embodiment, referring again to Figure 2 , a depression is provided on the side of the planarization layer 54 facing away from the substrate 10. The portion of the first electrode 41 exposed by the pixel opening 551 includes a first electrode portion 411 located at the bottom of the depression and a second electrode portion 412 located on the side surface of the depression. The orthographic projection of the block structure 32 on the substrate 10 falls within the orthographic projection of one first electrode portion 411 on the substrate 10, and the area of the orthographic projection of the block structure 32 on the substrate 10 is smaller than the area of the orthographic projection of the corresponding first electrode portion 411 on the substrate 10. With such a setting, the amount of light emitted from the display substrate at a large viewing angle can be further increased, the brightness of the display substrate at a large viewing angle can be improved, and the color shift phenomenon of the display substrate at a large viewing angle can be alleviated.

[0059] In one embodiment, each pixel opening 551 corresponds to at least one block structure 32. In this way, it is more helpful to improve the brightness of the display substrate at a large viewing angle and alleviate the color shift phenomenon of the display substrate at a large viewing angle.

[0060] In one embodiment, the shapes of the bulk structures corresponding to the light-emitting structures of different light-emitting colors in the light-emitting layer are the same or different. Figure 3 and Figure 4 In the illustrated embodiment, the shapes of the bulk structures corresponding to the light-emitting structures of different light-emitting colors are all the same. In other embodiments, the shapes of the bulk structures corresponding to the light-emitting structures of different light-emitting colors in the light-emitting layer may be different.

[0061] In one embodiment, the bulk structure 32 corresponding to at least one of the first electrodes 41 is located within its corresponding barrier portion 31 and there is a gap between the bulk structure 32 and the barrier portion 31, and the first electrode 41 is electrically connected to the pixel driving circuit 20 through the gap between the barrier portion 31 and the bulk structure 32. With such an arrangement, the setting of the barrier layer 30 does not affect the electrical connection between the first electrode 41 and the pixel driving circuit.

[0062] The embodiment of the present application further provides a method for manufacturing a display substrate. The manufacturing process of the display substrate will be introduced below. The "lithography process" mentioned in the embodiment of the present application includes processes such as depositing a film layer, coating a photoresist, mask exposure, development, etching, and stripping the photoresist. Deposition can adopt processes such as sputtering, evaporation, or chemical vapor deposition, and etching can adopt processes such as dry etching or wet etching. A "thin film" refers to a thin film made of a certain material on a substrate by using a deposition or coating process. If the "thin film" does not require a lithography process during the entire manufacturing process, the "thin film" can also be called a "layer". When the "thin film" still requires a lithography process during the entire manufacturing process, it is called a "thin film" before the lithography process and can be called a "layer" after the lithography process. The "layer" after the lithography process contains at least one "pattern". Refer to Figure 5 , the method for manufacturing the display substrate includes the following steps 110 to step

[0063] In step 110, a substrate is provided.

[0064] In step 120, a pixel driving circuit located on the substrate is formed.

[0065] In one embodiment, refer to Figure 1 and Figure 2, the pixel driving circuit 20 includes a thin film transistor 21 and a capacitor 22. The thin film transistor 21 includes an active layer 211, a gate electrode 212, a third electrode 213, and a fourth electrode 241. The first electrode 41 of the light emitting structure 40 is electrically connected to the fourth electrode 214 through a through hole penetrating the planarization layer 54. One of the third electrode 213 and the fourth electrode 214 is a source electrode, and the other is a drain electrode. The capacitor 22 includes a first electrode plate 221 and a second electrode plate 222 disposed opposite to the first electrode plate 221 on a side of the first electrode plate 221 facing away from the substrate 10. The first electrode plate 221 and the gate electrode 212 are on the same layer.

[0066] In one embodiment, the display substrate 100 further includes a gate insulating layer 51, a capacitor insulating layer 52, and an interlayer dielectric layer 53.

[0067] In one embodiment, the step 120 of forming the pixel driving circuit on the substrate includes the following process:

[0068] First, an active layer thin film is deposited on the substrate 10, and the active layer thin film is patterned through a patterning process to form the active layer 211.

[0069] Subsequently, the gate insulating layer 51 and the first metal thin film are sequentially deposited, and the first metal thin film is patterned through a patterning process to form the gate electrode 212 and the first electrode plate 221.

[0070] Subsequently, the capacitor insulating layer 52 and the second metal thin film are sequentially deposited, and the second metal thin film is patterned through a patterning process to form the second electrode plate 222.

[0071] Subsequently, the interlayer dielectric layer 53 is sequentially deposited, and the gate insulating layer 51, the capacitor insulating layer 52, and the interlayer dielectric layer 53 are etched to form a through hole penetrating the gate insulating layer 51, the capacitor insulating layer 52, and the interlayer dielectric layer 53. The through hole is located at a side of the active layer and exposes a side portion of the active layer.

[0072] Subsequently, a third metal thin film is sequentially deposited, and the third metal thin film is patterned through a patterning process to form the third electrode 213 and the fourth electrode 214. The third electrode 213 and the fourth electrode 214 are electrically connected to the active layer 211 through through holes respectively.

[0073] In step 130, a planarization layer is formed on a side of the pixel driving circuit facing away from the substrate.

[0074] In step 140, a barrier layer is formed on a side of the planarization layer facing away from the substrate. The barrier layer is used to block water and oxygen.

[0075] In one embodiment, the barrier layer 30 includes a plurality of barrier portions 31 and a block structure 32.

[0076] In one embodiment, the barrier layer 30 includes an inorganic layer.

[0077] Further, the barrier layer is an inorganic layer. The step 120 of forming a pixel driving circuit on the substrate includes the following process:

[0078] Deposit an inorganic layer film on the side of the planarization layer away from the substrate, and pattern the inorganic layer film through a patterning process to form the barrier layer 30.

[0079] In one embodiment, the barrier layer 30 includes a plurality of barrier portions 31, and the barrier portions 31 are annular. The edges of the positive projections of at least the first electrodes 41 located in the edge region of the display area on the substrate 10 are located between the inner edge and the outer edge of the positive projection of one of the barrier portions 31 on the substrate 10.

[0080] In step 150, a light-emitting layer is formed on the side of the barrier layer away from the substrate. The light-emitting layer includes a plurality of light-emitting structures located in the display area. The light-emitting structure includes a first electrode, an organic light-emitting material layer located on the side of the first electrode away from the substrate, and a second electrode located on the side of the organic light-emitting material layer away from the substrate.

[0081] Among them, the edges of the positive projections of at least the first electrodes located in the edge region of the display area on the substrate fall within the positive projection of the barrier layer on the substrate, and do not overlap with the edge of the positive projection of the barrier layer on the substrate.

[0082] In one embodiment, the barrier layer 30 includes a plurality of block structures 32. The positive projection of each block structure 32 on the substrate 10 falls within the positive projection of the bottom of one of the pixel openings 551 on the substrate 10, and the area of the positive projection of the block structure 32 on the substrate 10 is smaller than the area of the positive projection of the bottom of the corresponding pixel opening 551 on the substrate 10.

[0083] Since the preparation method of the display substrate and the display substrate belong to the same inventive concept, the specific details and the beneficial effects brought are the same, and will not be elaborated here.

[0084] The embodiment of the present application also provides a display panel. Refer to Figure 1 and Figure 2 , the display panel 200 includes the display substrate 100, and a packaging layer 60 and a color filter layer 70 located on the display substrate 100. The packaging layer 60 and the color filter layer 70 are located on the side of the light-emitting layer away from the substrate.

[0085] In one embodiment, the encapsulation layer 60 may be a thin film encapsulation layer, including an inorganic layer and an organic layer alternately stacked, and the outermost layer from the substrate is an inorganic layer. For example, the encapsulation layer 60 includes two inorganic layers and an organic layer located between the two inorganic layers.

[0086] In one embodiment, the color filter layer 70 includes color resistors 71 and black matrices 72 arranged at intervals. The color resistors 71 can correspond one-to-one with the pixel openings 551, and the orthographic projection of the color resistors 71 on the substrate covers the orthographic projection of the corresponding pixel openings 551 on the substrate.

[0087] The film layer sequence of the encapsulation layer and the color filter layer is not limited to Figure 1 and Figure 2 as described. In some embodiments, the color filter layer may be located in the encapsulation layer.

[0088] The display panel may further include a glass cover plate on the side of the display substrate away from the substrate.

[0089] An embodiment of the present application also provides a display device, and the display device includes the display panel described in the above embodiment.

[0090] The display device may further include a housing, and the display panel is embedded in the housing.

[0091] The display device may further include a plurality of sensors, such as a fingerprint recognition sensor, a distance sensor, etc.

[0092] The display device provided by the embodiment of the present application may be, for example, any device with a display function such as a mobile phone, a tablet computer, a television, a laptop computer, a vehicle-mounted device, etc.

[0093] It should be noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Moreover, it can be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be an intermediate layer. Additionally, it can be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element, or there may be more than one intermediate layer or element. Additionally, it can also be understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Like reference numerals throughout indicate like elements.

[0094] Other embodiments of the present application will be readily apparent to those skilled in the art upon consideration of the specification and practice of the disclosure herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only illustrative, and the true scope and spirit of the present application are pointed out by the following claims.

[0095] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A display substrate, characterized in that, The display substrate includes a display area; the display substrate includes: a substrate; a pixel driving circuit located on the substrate; a planarization layer located on a side of the pixel driving circuit away from the substrate; a barrier layer located on a side of the planarization layer away from the substrate, the barrier layer being configured to block water and oxygen; the barrier layer includes a plurality of barrier portions and a plurality of block structures; the barrier portions are annular; a light-emitting layer located on a side of the barrier layer away from the substrate, the light-emitting layer includes a plurality of light-emitting structures located in the display area, the light-emitting structure includes a first electrode, an organic light-emitting material layer located on a side of the first electrode away from the substrate, and a second electrode located on a side of the organic light-emitting material layer away from the substrate; at least an edge of a positive projection of the first electrode on the substrate in the edge region of the display area falls within a positive projection of the barrier layer on the substrate and does not overlap with an edge of the positive projection of the barrier layer on the substrate; at least an edge of a positive projection of each of the first electrodes on the substrate in the edge region of the display area is located between an inner edge and an outer edge of a positive projection of one of the barrier portions on the substrate; a pixel defining layer located on a side of the barrier layer away from the substrate, the pixel defining layer is provided with pixel openings corresponding to the light-emitting structures one by one; the pixel defining layer is located on the first electrode, and the pixel openings expose a part of the corresponding first electrode; a positive projection of each of the block structures on the substrate falls within a positive projection of a bottom of a corresponding pixel opening on the substrate, and an area of the positive projection of the block structure on the substrate is smaller than an area of the positive projection of the bottom of the corresponding pixel opening on the substrate.

2. The display substrate according to claim 1, wherein The barrier layer includes an inorganic layer.

3. The display substrate according to claim 2, wherein The thickness range of the inorganic layer is 500 Å to 3000 Å.

4. The display substrate according to claim 1, wherein A recess is provided on a side of the planarization layer away from the substrate, and a part of the first electrode exposed by the pixel opening includes a first electrode portion located at a bottom of the recess and a second electrode portion located on a side surface of the recess.

5. The display substrate according to claim 4, characterized in that The barrier layer includes a plurality of block structures, a positive projection of each of the block structures on the substrate falls within a positive projection of a corresponding first electrode portion on the substrate, and an area of the positive projection of the block structure on the substrate is smaller than an area of the positive projection of the corresponding first electrode portion on the substrate.

6. The display substrate according to claim 1, wherein The light-emitting layer includes the light-emitting structures of at least three different light-emitting colors, and shapes of the block structures corresponding to the light-emitting structures of different light-emitting colors are the same or different; and / or, the block structure corresponding to at least one of the first electrodes is located within its corresponding barrier portion and there is a gap between the block structure and the barrier portion, and the first electrode is electrically connected to the pixel driving circuit through the gap between the barrier portion and the block structure.

7. A display panel, characterized in that, The display panel includes the display substrate according to any one of claims 1 to 6, and a packaging layer and a color filter layer located on the display substrate.

8. A display device, characterized in that, The display device includes the display panel according to claim 7.

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