Display panel, display substrate and manufacturing method thereof

Abstract

The present disclosure provides a display panel, a display substrate and a method for manufacturing the same. The display substrate comprises: a base substrate; a pixel defining layer, which is disposed on the base substrate and comprises a plurality of first pixel defining strips extending along a first direction and a plurality of second pixel defining strips extending along a second direction, wherein the first direction intersects with the second direction; the surface of the first pixel defining strip facing away from the base substrate is located on the side of the surface of the second pixel defining strip facing away from the base substrate; wherein a plurality of the second pixel defining strips are disposed between two adjacent first pixel defining strips, and at least one of the second pixel defining strips in the second direction comprises a first pixel defining portion and a second pixel defining portion, and the thickness of the first pixel defining portion is greater than the thickness of the second pixel defining portion. The present disclosure can improve the utilization rate of ink.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel, a display substrate and a method for preparing the same. Background Art

[0002] OLED (Organic Light Emitting Diode) display devices have become a type of display device that is extremely competitive and has good development prospects due to a series of advantages such as all-solid-state structure, self-luminescence, fast response speed, high brightness, full viewing angle, and flexible display. The film-forming methods of OLED display devices mainly include evaporation process and solution process. The evaporation process is relatively mature in small-size applications, and the technology has been applied to mass production. The main film-forming methods using solution processes include inkjet printing, nozzle coating, spin coating, screen printing, etc., among which inkjet printing technology is considered to be an important way to achieve mass production of large-size OLEDs. However, the utilization rate of ink in this inkjet printing technology is low. Summary of the invention

[0003] The purpose of the present disclosure is to provide a display panel, a display substrate and a method for manufacturing the same, which can improve the utilization rate of ink.

[0004] According to one aspect of the present disclosure, there is provided a display substrate, comprising:

[0005] substrate substrate;

[0006] A pixel defining layer is provided on the base substrate and includes a plurality of first pixel defining strips extending along a first direction and a plurality of second pixel defining strips extending along a second direction, wherein the first direction intersects with the second direction; a surface of the first pixel defining strip facing away from the base substrate is located on a side of a surface of the second pixel defining strip facing away from the base substrate; wherein a plurality of the second pixel defining strips are provided between two adjacent first pixel defining strips, and in the second direction at least one of the second pixel defining strips includes a first pixel defining portion and a second pixel defining portion, and a thickness of the first pixel defining portion is greater than a thickness of the second pixel defining portion.

[0007] Furthermore, in at least one of the second pixel defining strips, one end of the first pixel defining portion away from the second pixel defining portion contacts the first pixel defining strip.

[0008] Further, there are at least two adjacent first pixel defining strips, one end of the first pixel defining portion away from the second pixel defining portion contacts one of the first pixel defining strips, and one end of the second pixel defining portion away from the first pixel defining portion contacts another of the first pixel defining strips.

[0009] Further, a thickness of the first pixel defining portion gradually decreases from an end of the first pixel defining portion away from the second pixel defining portion to an end of the first pixel defining portion close to the second pixel defining portion.

[0010] Furthermore, a side of the first pixel defining portion facing away from the base substrate is in a step structure.

[0011] Furthermore, a surface of the first pixel defining portion facing away from the base substrate is an inclined surface.

[0012] Furthermore, the second pixel defining portion has a uniform thickness.

[0013] Furthermore, a surface of the second pixel defining portion facing away from the base substrate is an inclined surface, and a surface of the second pixel defining portion facing away from the base substrate is smoothly transitionally connected to a surface of the first pixel defining portion facing away from the base substrate.

[0014] Furthermore, there are two adjacent second pixel defining strips between two adjacent first pixel defining strips, and the second pixel defining portion of one second pixel defining strip is staggered with the second pixel defining portion of another second pixel defining strip in the first direction.

[0015] Furthermore, the second pixel defining strip further includes a third pixel defining portion, the thickness of the first pixel defining portion is greater than the thickness of the third pixel defining portion, and the third pixel defining portion, the first pixel defining portion and the second pixel defining portion are connected in sequence.

[0016] Further, for two adjacent first pixel defining strips, one end of the third pixel defining portion away from the first pixel defining portion contacts one of the first pixel defining strips, and one end of the second pixel defining portion away from the first pixel defining portion contacts the other of the first pixel defining strips.

[0017] Furthermore, the third pixel defining portion, the first pixel defining portion, and the second pixel defining portion connected in sequence constitute a pixel defining body, and the number of the pixel defining bodies is plural.

[0018] According to one aspect of the present disclosure, a method for preparing a display substrate is provided, wherein the method is used to prepare the above-mentioned display substrate, and the method comprises:

[0019] A light emitting material layer is formed on the side of the base substrate where the pixel defining layer is provided by an inkjet printing process.

[0020] According to one aspect of the present disclosure, a display panel is provided, comprising the above-mentioned display substrate.

[0021] The display panel, display substrate and preparation method thereof disclosed in the present invention, in the process of preparing the light-emitting material layer by the inkjet printing process, the ink can cross the second pixel defining strip to flow between two adjacent first pixel defining strips, and after the inkjet printing process is completed, ink exists on the surface of the second pixel defining strip facing away from the base substrate. Since the thickness of the first pixel defining portion is greater than the thickness of the second pixel defining portion, that is, the thickness of the first pixel defining portion is larger, the ink climbing onto the first pixel defining portion is less than the ink climbing onto the second pixel defining portion. In other words, the ink climbing onto the first pixel defining portion is reduced, thereby reducing the ink existing on the surface of the second pixel defining strip facing away from the base substrate, so that more ink is gathered in the pixel area, thereby improving the utilization rate of the ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a display substrate according to an embodiment of the present disclosure.

[0023] Figure 2 yes Figure 1 Schematic diagram of the AA section of the structure shown.

[0024] Figure 3 yes Figure 1 Schematic diagram of the BB cross section of the structure shown.

[0025] Figure 4 yes Figure 1 Another AA cross-sectional schematic diagram of the structure shown.

[0026] Figure 5 yes Figure 1 Another BB cross-sectional schematic diagram of the structure shown.

[0027] Figure 6-Figure 9 AA cross-sectional schematic diagrams of the display substrate of the present disclosure in different implementations.

[0028] Explanation of the reference numerals: 1. first pixel defining strip; 2. second pixel defining strip; 20. pixel defining body; 201. first pixel defining portion; 202. second pixel defining portion; 203. third pixel defining portion; 3. base substrate. DETAILED DESCRIPTION

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

[0030] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. "Multiple" or "several" means two and more than two. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. As used in this disclosure and the appended claims, the singular forms "a", "an", "said", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

[0031] like Figure 1 and Figure 2 As shown, the embodiment of the present disclosure provides a display substrate. The display substrate may include a base substrate 3 and a pixel defining layer, wherein:

[0032] The pixel defining layer is disposed on the base substrate 3, and the pixel defining layer includes a plurality of first pixel defining strips 1 extending along a first direction and a plurality of second pixel defining strips 2 extending along a second direction. The first direction intersects with the second direction. The thickness of the first pixel defining strips 1 is greater than the thickness of the second pixel defining strips 2. A plurality of second pixel defining strips 2 are disposed between two adjacent first pixel defining strips 1, and at least one second pixel defining strip 2 in the second direction includes a first pixel defining portion 201 and a second pixel defining portion 202. The thickness of the first pixel defining portion 201 is greater than the thickness of the second pixel defining portion 202.

[0033] In the display substrate of the embodiment of the present disclosure, during the process of preparing the light-emitting material layer by the inkjet printing process, the ink can cross the second pixel defining strip 2 to flow between two adjacent first pixel defining strips 1, and after the inkjet printing process is completed, ink exists on the surface of the second pixel defining strip 2 facing away from the base substrate 3. Since the thickness of the first pixel defining portion 201 is greater than the thickness of the second pixel defining portion 202, that is, the thickness of the first pixel defining portion 201 is larger, the ink climbing onto the first pixel defining portion 201 is less than the ink climbing onto the second pixel defining portion 202. In other words, the ink climbing onto the first pixel defining portion 201 is reduced, thereby reducing the ink existing on the surface of the second pixel defining strip 2 facing away from the base substrate 3, so that more ink is gathered in the pixel area, thereby improving the utilization rate of the ink.

[0034] like Figure 2 As shown, the substrate substrate 3 may include a substrate and a driving circuit layer. The substrate may be a rigid substrate. The rigid substrate may be a glass substrate or a PMMA (Polymethyl methacrylate) substrate, etc. Of course, the substrate may also be a flexible substrate. The flexible substrate may be a PET (Polyethyleneterephthalate) substrate, a PEN (Polyethylene naphthalate twoformic acid glycol ester) substrate or a PI (Polyimide) substrate. The driving circuit layer may be disposed on the substrate. The driving circuit layer may include a plurality of driving transistors. The driving transistor may be a thin film transistor, but the embodiments of the present disclosure are not limited thereto. The thin film transistor may be a top gate thin film transistor, and of course, the thin film transistor may also be a bottom gate thin film transistor. Taking the thin film transistor as a top gate thin film transistor as an example, the driving circuit layer may include an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, a source electrode and a drain electrode. The active layer may be disposed on the substrate. The gate insulating layer may be arranged on the substrate and cover the active layer. The gate electrode may be arranged on the side of the gate insulating layer away from the substrate. The interlayer insulating layer may be arranged on the gate insulating layer and cover the gate electrode. The source and drain may be arranged on the interlayer insulating layer and connected to the active layer via vias passing through the interlayer insulating layer and the gate insulating layer. In addition, the substrate 3 may further include a planarizing layer. The planarizing layer may be arranged on the surface of the driving circuit layer facing away from the substrate and cover the source and drain of the above-mentioned driving transistor. The substrate 3 may also be provided with an anode layer. The anode layer is arranged on the planarizing layer and connected to the source or drain of the driving transistor via vias passing through the planarizing layer.

[0035] like Figure 1As shown, the pixel defining layer can be arranged on the base substrate 3. Taking the base substrate 3 including the above-mentioned planarization layer as an example, the pixel defining layer can be arranged on the planarization layer. The pixel defining layer includes a first pixel defining strip 1 and a second pixel defining strip 2. The number of the first pixel defining strips 1 is multiple, and they extend along the first direction and are spaced apart along the second direction, that is, the multiple first pixel defining strips 1 are arranged in parallel, wherein the area between any two adjacent first pixel defining strips 1 forms a pixel area. The pixel area may include a red pixel area, a green pixel area and a blue pixel area. The first direction is Figure 1 The X direction in the second direction is Figure 1 The first direction intersects with the second direction so that the first pixel defining strip 1 and the second pixel defining strip 2 are arranged crosswise, wherein the crosswise arranged first pixel defining strip 1 and the second pixel defining strip 2 form a plurality of sub-pixel openings, each of which exposes the above-mentioned anode layer. Further, the first direction may be perpendicular to the second direction. The number of the second pixel defining strips 2 is multiple, and they extend along the second direction and are spaced apart along the first direction, that is, the plurality of second pixel defining strips 2 are arranged in parallel. Any first pixel defining strip 1 is arranged crosswise with the plurality of second pixel defining strips 2, so that the pixel area between two adjacent first pixel defining strips 1 is divided into a plurality of sub-pixel areas by the second pixel defining strip 2. In addition, the thickness of the first pixel defining strip 1 is greater than the thickness of the second pixel defining strip 2, that is, the size of the first pixel defining strip 1 in the direction perpendicular to the substrate 3 is greater than the size of the second pixel defining strip 2 in the direction perpendicular to the substrate 3, that is, the surface of the first pixel defining strip 1 facing away from the substrate 3 is located on the side of the surface of the second pixel defining strip 2 facing away from the substrate 3. It should be noted that the thickness of the intersection area of ​​the first pixel defining strip 1 and the second pixel defining strip 2 can be greater than the thickness of the first pixel defining strip 1, and of course, it can also be equal to the thickness of the first pixel defining strip 1. Among them, the side wall of the intersection area of ​​the first pixel defining strip 1 and the second pixel defining strip 2 can be a lyophilic area. In the inkjet printing process, the ink containing the organic light-emitting material will flow in the pixel area to form an organic light-emitting material layer in each sub-pixel area, so that the multiple sub-pixel areas between the two adjacent first pixel defining strips 1 form sub-pixels of the same color. At the same time, the first pixel defining strip 1 with a larger thickness can prevent the ink from climbing from one pixel area to another. In addition, when the side wall of the intersection area of ​​the first pixel defining strip 1 and the second pixel defining strip 2 is a lyophilic area, the ink containing the organic light-emitting material will climb along the side wall of the intersection area. The pixel defining layer disclosed in the present invention has a large area in each pixel area, and the ink is easy to flow, which can alleviate the phenomenon of uneven film thickness of the light-emitting material layer between different sub-pixels. Figure 1 The CC cross-sectional diagram in the structure shown is also shown in Figure 2 As shown,

[0036] like Figure 2 As shown, along the second direction, the second pixel defining strip 2 located between two adjacent first pixel defining strips 1 includes a first pixel defining portion 201 and a second pixel defining portion 202. The thickness of the first pixel defining portion 201 is greater than the thickness of the second pixel defining portion 202, that is, the size of the first pixel defining portion 201 in a direction perpendicular to the base substrate 3 is greater than the size of the second pixel defining portion 202 in a direction perpendicular to the base substrate 3.

[0037] In one embodiment of the present disclosure, Figure 2 As shown, in at least one second pixel defining strip 2, the end of the first pixel defining portion 201 away from the second pixel defining portion 202 contacts the first pixel defining strip 1, and because the height of the first pixel defining portion 201 is greater than the height of the second pixel defining portion 202, the thickness difference between the intersection area of ​​the first pixel defining strip 1 and the second pixel defining strip 2 and the second pixel defining strip 2 is reduced, thereby reducing the ink climbing to the side wall of the intersection area, and also reducing the ink climbing to the second pixel defining strip 2, thereby reducing the waste of ink. Further, the first pixel defining portion 201 and the second pixel defining portion 202 contact two adjacent first pixel defining strips 1 in a one-to-one correspondence, that is, there are at least two adjacent first pixel defining strips 1, the end of the first pixel defining portion 201 away from the second pixel defining portion 202 contacts one first pixel defining strip 1, and the end of the second pixel defining portion 202 away from the first pixel defining portion 201 contacts another first pixel defining strip 1. In addition, the thickness of the first pixel defining portion 201 gradually decreases from the end of the first pixel defining portion 201 away from the second pixel defining portion 202 to the end of the first pixel defining portion 201 close to the second pixel defining portion 202, that is, the size of the first pixel defining portion 201 in the direction perpendicular to the base substrate 3 gradually decreases. Figure 4 As shown, the side of the first pixel defining portion 201 facing away from the base substrate 3 may be a step structure, and the height of the step structure gradually decreases from the end of the first pixel defining portion 201 away from the second pixel defining portion 202 to the end of the first pixel defining portion 201 close to the second pixel defining portion 202, so that the thickness of the first pixel defining portion 201 gradually decreases. In other embodiments of the present disclosure, such as Figure 2 As shown, the surface of the first pixel defining portion 201 facing away from the base substrate 3 may be an inclined surface, that is, the thickness of the first pixel defining portion 201 decreases linearly from the end of the first pixel defining portion 201 away from the second pixel defining portion 202 to the end of the first pixel defining portion 201 close to the second pixel defining portion 202. Figure 4As shown, the second pixel defining portion 202 has a uniform thickness, that is, the surface of the second pixel defining portion 202 facing away from the base substrate 3 is parallel to the base substrate 3, wherein the thickness of the second pixel defining portion 202 may be 0.2 μm-0.6 μm, for example, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, etc. In other embodiments of the present disclosure, such as Figure 2 As shown, taking the surface of the first pixel defining portion 201 facing away from the substrate 3 as an example, the surface of the second pixel defining portion 202 facing away from the substrate 3 is also a slope, and the surface of the second pixel defining portion 202 facing away from the substrate 3 is smoothly transitioned to the surface of the first pixel defining portion 201 facing away from the substrate 3, that is, the surface of the second pixel defining portion 202 facing away from the substrate 3 is coplanar with the surface of the first pixel defining portion 201 facing away from the substrate 3.

[0038] Figure 1 The CC cross-sectional diagram in the structure shown is also shown in Figure 2 or Figure 4 As shown. Figures 2 to 5 As shown, there are two adjacent second pixel defining strips 2 between the two adjacent first pixel defining strips 1, and the second pixel defining portion 202 of one second pixel defining strip 2 is staggered in the first direction from the second pixel defining portion 202 of the other second pixel defining strip 2. Specifically, taking the second pixel defining strip 2 including the first pixel defining portion 201 and the second pixel defining portion 202 as an example, for the two adjacent second pixel defining strips 2, the direction from the first pixel defining portion 201 to the second pixel defining portion 202 in one second pixel defining strip 2 is opposite to the direction from the first pixel defining portion 201 to the second pixel defining portion 202 in the other second pixel defining strip 2. When the display substrate is tilted, the ink between two adjacent first pixel defining strips 1 will flow along the first direction. Since the thickness of the second pixel defining portion 202 is less than that of the first pixel defining portion 201, a large amount of ink will cross the second pixel defining portion 202 with a smaller thickness. Moreover, since the two adjacent second pixel defining portions 202 are staggered, the ink needs to change the flow path to cross the next second pixel defining portion 202, which is equivalent to slowing down the flow speed of the ink in the first direction, thereby reducing the flow distance of the ink in the first direction, solving the problem of excessive unevenness of the ink thickness; at the same time, it can also alleviate the phenomenon of ink aggregation caused by particulate matter pulling the ink.

[0039] In addition, if Figure 6 As shown, the second pixel defining strip 2 located between two adjacent first pixel defining strips 1 may further include a third pixel defining portion 203. In one embodiment of the present disclosure, as Figure 6As shown, the thickness of the first pixel defining portion 201 is greater than the thickness of the third pixel defining portion 203, and the third pixel defining portion 203, the first pixel defining portion 201 and the second pixel defining portion 202 are sequentially connected in the second direction. Figure 7 and Figure 8 As shown in FIG. 2 , the third pixel defining portion 203, the first pixel defining portion 201 and the second pixel defining portion 202 connected in sequence form a pixel defining body 20. Figure 6 and Figure 7 As shown, the surface of the first pixel defining portion 201 facing away from the substrate substrate 3 can be a curved surface, and protrudes outwardly away from the substrate substrate 3; the surface of the second pixel defining portion 202 facing away from the substrate substrate 3 can be a curved surface, and smoothly transitions to the surface of the first pixel defining portion 201 facing away from the substrate substrate 3, and the thickness of the second pixel defining portion 202 gradually decreases from the end of the second pixel defining portion 202 close to the first pixel defining portion 201 to the end of the second pixel defining portion 202 away from the first pixel defining portion 201; the surface of the third pixel defining portion 203 facing away from the substrate substrate 3 can be a curved surface, and smoothly transitions to the surface of the first pixel defining portion 201 facing away from the substrate substrate 3, and the thickness of the second pixel defining portion 202 gradually decreases from the end of the third pixel defining portion 203 close to the first pixel defining portion 201 to the end of the third pixel defining portion 203 away from the first pixel defining portion 201. It can be seen that Figure 6 as well as Figure 7 The surface of the pixel defining body 20 facing away from the base substrate 3 is a curved surface. Of course, the surface of the pixel defining body 20 facing away from the base substrate 3 may also include Figure 8 The two inclined surfaces shown in FIG. 1 , that is, the cross section of the pixel defining body 20 is triangular. The number of the pixel defining body 20 can be one or more. The plurality of pixel defining bodies 20 are distributed along the second direction. Figure 6 As shown, when the number of pixel defining bodies 20 is one, for two adjacent first pixel defining strips 1, one end of the third pixel defining portion 203 away from the first pixel defining portion 201 contacts one first pixel defining strip 1, and one end of the second pixel defining portion 202 away from the first pixel defining portion 201 contacts the other first pixel defining strip 1.

[0040] In another embodiment of the present disclosure, Fig. 9As shown, the thickness of the third pixel defining portion 203 is greater than the thickness of the second pixel defining portion 202, and the first pixel defining portion 201, the second pixel defining portion 202 and the third pixel defining portion 203 are sequentially connected in the second direction. For two adjacent first pixel defining strips 1, one end of the third pixel defining portion 203 away from the second pixel defining portion 202 contacts one first pixel defining strip 1, and one end of the first pixel defining portion 201 away from the second pixel defining portion 202 contacts the other first pixel defining strip 1. Among them, the surface of the second pixel defining portion 202 facing away from the substrate substrate 3 can be a curved surface, and is recessed inward toward the substrate substrate 3; the surface of the third pixel defining portion 203 facing away from the substrate substrate 3 can be a curved surface, and is smoothly transitioned to the surface of the second pixel defining portion 202 facing away from the substrate substrate 3, and the thickness of the second pixel defining portion 202 gradually decreases from one end of the third pixel defining portion 203 close to the second pixel defining portion 202 to one end of the third pixel defining portion 203 away from the second pixel defining portion 202; the surface of the first pixel defining portion 201 facing away from the substrate substrate 3 can be a curved surface, and is smoothly transitioned to the surface of the second pixel defining portion 202 facing away from the substrate substrate 3, and the thickness of the first pixel defining portion 201 gradually increases from one end of the first pixel defining portion 201 close to the second pixel defining portion 202 to one end of the first pixel defining portion 201 away from the second pixel defining portion 202.

[0041] The present disclosure also provides a method for preparing a display substrate. The method is used to prepare the display substrate described in any of the above embodiments. The method may include: forming a light-emitting material layer on a side of the base substrate where the pixel defining layer is provided by an inkjet printing process. The light-emitting material layer may be an organic light-emitting material layer.

[0042] The embodiment of the present disclosure also provides a display panel, which may include the display substrate described in any of the above embodiments. The display panel may be an OLED display panel, which may be used in mobile phones, tablet computers, televisions, etc.

[0043] The display panel, the method for preparing the display substrate, and the display substrate provided in the embodiments of the present disclosure belong to the same inventive concept, and the descriptions of the relevant details and beneficial effects can be referred to each other and will not be repeated here.

[0044] The above is only a preferred embodiment of the present disclosure and does not limit the present disclosure in any form. Although the present disclosure has been disclosed as a preferred embodiment as above, it is not used to limit the present disclosure. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present disclosure. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present disclosure without departing from the content of the technical solution of the present disclosure are still within the scope of the technical solution of the present disclosure.

Claims

1. A display substrate, characterized in that: include: A substrate substrate, the substrate substrate comprising a substrate and a driving circuit layer; A pixel defining layer is disposed on the base substrate and includes a plurality of first pixel defining strips extending along a first direction and a plurality of second pixel defining strips extending along a second direction, wherein the first direction intersects with the second direction; The surface of the first pixel defining strip facing away from the substrate is located on the side of the surface of the second pixel defining strip facing away from the substrate; wherein, a plurality of the second pixel defining strips are arranged between two adjacent first pixel defining strips, and at least one of the second pixel defining strips includes a first pixel defining portion and a second pixel defining portion in the second direction, and the thickness of the first pixel defining portion is greater than the thickness of the second pixel defining portion.

2. The display substrate according to claim 1, characterized in that: In at least one of the second pixel defining strips, one end of the first pixel defining portion away from the second pixel defining portion contacts the first pixel defining strip.

3. The display substrate according to claim 2, characterized in that: There are at least two adjacent first pixel defining strips, one end of the first pixel defining portion away from the second pixel defining portion contacts one of the first pixel defining strips, and one end of the second pixel defining portion away from the first pixel defining portion contacts another of the first pixel defining strips.

4. The display substrate according to claim 2 or 3, characterized in that: The thickness of the first pixel defining portion gradually decreases from an end of the first pixel defining portion away from the second pixel defining portion to an end of the first pixel defining portion close to the second pixel defining portion.

5. The display substrate according to claim 4, characterized in that: The side of the first pixel defining portion facing away from the base substrate is in a step structure.

6. The display substrate according to claim 4, characterized in that: A surface of the first pixel defining portion facing away from the base substrate is an inclined surface.

7. The display substrate according to claim 5 or 6, characterized in that: The second pixel defining portion has a uniform thickness.

8. The display substrate according to claim 6, characterized in that: The surface of the second pixel defining portion facing away from the base substrate is an inclined surface, and the surface of the second pixel defining portion facing away from the base substrate is smoothly transitionally connected to the surface of the first pixel defining portion facing away from the base substrate.

9. The display substrate according to claim 1, characterized in that: Two adjacent second pixel defining strips exist between two adjacent first pixel defining strips, and the second pixel defining portion of one second pixel defining strip is staggered with the second pixel defining portion of another second pixel defining strip in the first direction.

10. The display substrate according to claim 1, characterized in that: The second pixel defining strip further includes a third pixel defining portion, the first pixel defining portion has a thickness greater than that of the third pixel defining portion, and the third pixel defining portion, the first pixel defining portion and the second pixel defining portion are sequentially connected.

11. The display substrate according to claim 10, characterized in that: For two adjacent first pixel defining strips, one end of the third pixel defining portion away from the first pixel defining portion contacts one of the first pixel defining strips, and one end of the second pixel defining portion away from the first pixel defining portion contacts the other of the first pixel defining strips.

12. The display substrate according to claim 10, characterized in that: The third pixel defining portion, the first pixel defining portion, and the second pixel defining portion connected in sequence constitute a pixel defining body, and the number of the pixel defining bodies is plural.

13. A method for preparing a display substrate, characterized in that: The preparation method is used to prepare the display substrate according to any one of claims 1 to 12, and the preparation method comprises: A light emitting material layer is formed on the side of the base substrate where the pixel defining layer is provided by an inkjet printing process.

14. A display panel, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 12.

Images