Display substrate and preparation method therefor

Abstract

A display substrate, comprising a substrate base and a pixel defining layer, wherein the pixel defining layer comprises a plurality of first retaining walls and a plurality of second retaining walls, the plurality of first retaining walls extending in a first direction, and the plurality of second retaining walls extending in a second direction which intersects the first direction; and the plurality of first retaining walls and the plurality of second retaining walls are connected and enclose a plurality of openings, and a plurality of light-emitting units are located in the plurality of openings on a one-to-one basis. A first adjustment portion is provided on the side of at least one first retaining wall of the plurality of first retaining walls that is close to the substrate base, the height of the first adjustment portion is gradually increased and then gradually decreased in the second direction, and the height direction of the first adjustment portion is perpendicular to the substrate base; in an orthographic projection to the substrate base, the first retaining wall overlaps with the first adjustment portion; and a first virtual auxiliary line is established between the highest point of the first retaining wall and the substrate base, a second virtual auxiliary line is established between the highest point of the first adjustment portion and the substrate base, and the first virtual auxiliary line does not overlap with the second virtual auxiliary line.

Description

Display substrate and manufacturing method thereof

[0001] This application claims priority to patent application number 202410140174.1 filed on January 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of display technology, and in particular to a display substrate and a preparation method thereof. Background Art

[0003] Electroluminescent display devices have become the mainstream development trend of current display devices due to their advantages such as self-luminescence, low power consumption, wide viewing angle, fast response speed and high contrast.

[0004] Currently, an organic functional layer can be formed in the opening of the pixel defining layer using a full coating technique such as blade coating or slit coating. For example, the organic functional layer includes a hole injection layer, a hole transport layer, and a light-emitting layer.

[0005] Summary of the Invention

[0006] In one aspect, a display substrate is provided. The display substrate comprises: a substrate, a pixel defining layer, a plurality of light-emitting units, and a first adjustment portion. The pixel defining layer is located on one side of the substrate. The pixel defining layer comprises: a plurality of first retaining walls and a plurality of second retaining walls, the plurality of first retaining walls extending along a first direction, and the plurality of second retaining walls extending along a second direction, the first and second directions intersecting. The plurality of first retaining walls and the plurality of second retaining walls are connected and enclose a plurality of openings, with the plurality of light-emitting units being located in a one-to-one correspondence within the plurality of openings. A first adjustment portion is provided on a side of at least one of the first retaining walls that is closest to the substrate. Along the second direction, the height of the first adjustment portion gradually increases and then gradually decreases, the height being the dimension of the first adjustment portion in a direction perpendicular to the substrate. In an orthographic projection onto the substrate, the first retaining wall and the first adjustment portion overlap. A first virtual auxiliary line is formed between the highest point of the first retaining wall and the substrate, and a second virtual auxiliary line is formed between the highest point of the first adjustment portion and the substrate, and the first and second virtual auxiliary lines do not overlap.

[0007] In some embodiments, in the same opening, the second virtual auxiliary line of the first adjustment portion is closer to the center of the opening than the first virtual auxiliary line of the first retaining wall.

[0008] In some embodiments, in the same opening, the second virtual auxiliary line of the first adjusting portion is farther away from the center of the opening than the first virtual auxiliary line of the first retaining wall.

[0009] In some embodiments, in a longitudinal cross-section of the first adjustment portion, portions located on both sides of the second virtual auxiliary line of the first adjustment portion have different height change rates; the longitudinal cross-section is perpendicular to the substrate and extends along the second direction.

[0010] In some embodiments, the first adjustment portion includes: a first sloped surface and a second sloped surface, the angle formed between the first sloped surface and the substrate is a first slope angle, the angle formed between the second sloped surface and the substrate is a second slope angle, and the angle of the first slope angle is greater than the angle of the second slope angle.

[0011] In some embodiments, a difference between the first slope angle and the second slope angle ranges from 5° to 55°.

[0012] In some embodiments, the first slope angle ranges from 35° to 70°; and / or the second slope angle ranges from 15° to 50°.

[0013] In some embodiments, in an orthographic projection onto the substrate, a portion of the second sloped surface away from the first sloped surface is located outside the first retaining wall.

[0014] In some embodiments, the display substrate further includes: a plurality of first electrodes, the plurality of first electrodes being arranged in one-to-one correspondence with the plurality of openings; and at least one first electrode among the plurality of first electrodes covering a portion of the second sloped surface of the first adjustment portion that is not covered by the first retaining wall.

[0015] In some embodiments, in the orthographic projection onto the substrate, the first electrode overlaps with the second sloped surface of the first adjustment portion and the first retaining wall; and the overlapping portion of the first electrode, the second sloped surface of the first adjustment portion and the first retaining wall is located between the first adjustment portion and the first retaining wall.

[0016] In some embodiments, in the longitudinal section of the first retaining wall and the first electrode, the portion of the first retaining wall close to the second sloped surface has a first angle with the first electrode, and the angle of the first angle is smaller than the angle of the second slope angle between the first adjustment portion and the substrate; the longitudinal section of the first retaining wall and the first electrode is perpendicular to the substrate and extends along the second direction.

[0017] In some embodiments, the difference between the first angle and the second slope angle ranges from 5° to 45°.

[0018] In some embodiments, the first angle ranges from 5° to 30°.

[0019] In some embodiments, in an orthographic projection onto the substrate, at least one first electrode among the plurality of first electrodes has no overlap with the first sloped surface of the first adjustment portion.

[0020] In some embodiments, in a longitudinal section of the first retaining wall, an angle formed between a portion of the first retaining wall away from the second sloped surface and the substrate is a second angle, and the second angle is greater than the first angle.

[0021] In some embodiments, the difference between the second angle and the first angle ranges from 5° to 65°.

[0022] In some embodiments, the second angle ranges from 30° to 70°.

[0023] In some embodiments, in an orthographic projection onto the substrate, a portion of the first sloped surface away from the second sloped surface is located outside the first retaining wall.

[0024] In some embodiments, at least one first electrode among the plurality of first electrodes covers a portion of the first sloped surface of the first adjustment portion that is not covered by the first retaining wall.

[0025] In some embodiments, in the orthographic projection onto the substrate, the first electrode overlaps with the first sloped surface of the first adjustment portion and the first retaining wall; and the overlapping portion of the first electrode, the first sloped surface of the first adjustment portion and the first retaining wall is located between the first adjustment portion and the first retaining wall.

[0026] In some embodiments, along the second direction, there is a first gap between each two adjacent first electrodes of the multiple first electrodes; a portion of the first retaining wall fills the first gap, and in the orthographic projection onto the substrate, the first virtual auxiliary line of the first retaining wall is located within the range of the first gap.

[0027] In some embodiments, the maximum height of the first retaining wall is greater than the maximum height of the first adjusting portion.

[0028] In some embodiments, a difference between a maximum height of the first adjustment portion and a maximum height of the first retaining wall ranges from 0.2 μm to 1.5 μm.

[0029] In some embodiments, the maximum height of the first adjustment portion ranges from less than or equal to 1.5 μm to greater than or equal to 0.5 μm; and / or the maximum height of the first retaining wall ranges from less than or equal to 2 μm to greater than or equal to 1 μm.

[0030] In some embodiments, the display substrate further comprises: a second adjustment portion disposed on a side of at least one of the second retaining walls proximal to the substrate; in an orthographic projection onto the substrate, the second retaining wall is located within the second adjustment portion. The display substrate further comprises: a plurality of first electrodes, the plurality of first electrodes being disposed in a one-to-one correspondence with the plurality of openings; at least one of the plurality of first electrodes covering a portion of the second adjustment portion.

[0031] In some embodiments, the second adjustment portion includes: a fifth sloped surface and a sixth sloped surface, the angle formed between the fifth sloped surface and the substrate is a third slope angle, the angle formed between the sixth sloped surface and the substrate is a fourth slope angle, and the angle of the third slope angle is approximately equal to the angle of the fourth slope angle.

[0032] In some embodiments, the second adjustment portion and the first adjustment portion are an integral structure.

[0033] In some embodiments, the second retaining wall includes: a seventh sloped surface and an eighth sloped surface, the angle formed between the seventh sloped surface and the substrate is a fifth slope angle, the angle formed between the eighth sloped surface and the substrate is a sixth slope angle, and the angle of the fifth slope angle is approximately equal to the angle of the sixth slope angle.

[0034] In some embodiments, the maximum size of the first retaining wall in the second direction is greater than the maximum size of the second retaining wall in the first direction.

[0035] In some embodiments, the second retaining wall and the first retaining wall are an integral structure.

[0036] In some embodiments, at the intersection of the first retaining wall and the second retaining wall, a portion of the second retaining wall covers a portion of the first retaining wall.

[0037] In some embodiments, the display substrate further includes: a planarization layer located between the plurality of light-emitting units and the substrate, and between the pixel defining layer and the substrate; the first adjustment portion and the planarization layer are an integrated structure.

[0038] On the other hand, a method for preparing a display substrate is provided, the method comprising: forming a first adjustment portion on one side of a substrate; along a second direction, the height of the first adjustment portion gradually increases and then gradually decreases, and the height is the dimension of the first adjustment portion in a direction perpendicular to the substrate; forming a pixel defining layer and a plurality of light-emitting units on one side of the substrate, the pixel defining layer comprising: a plurality of first retaining walls and a plurality of second retaining walls, the plurality of first retaining walls extending along a first direction, the plurality of second retaining walls extending along a second direction, the first direction and the second direction intersecting; the plurality of first retaining walls and the plurality of second retaining walls are connected and enclosed to form a plurality of openings, and a plurality of light-emitting units are located in the plurality of openings in a one-to-one correspondence.

[0039] In which, in the orthographic projection onto the substrate, the first retaining wall and the first adjustment portion overlap, and the first adjustment portion is located on the side of the first retaining wall close to the substrate; a first virtual auxiliary line is constructed between the highest point of the first retaining wall and the substrate, and a second virtual auxiliary line is constructed between the highest point of the first adjustment portion and the substrate, and the first virtual auxiliary line and the second virtual auxiliary line do not overlap.

[0040] In some embodiments, the first adjustment portion includes: a first sloped surface and a second sloped surface, the angle formed between the first sloped surface and the substrate is a first slope angle, the angle formed between the second sloped surface and the substrate is a second slope angle, and the angle of the first slope angle is greater than the angle of the second slope angle; forming the multiple light-emitting units includes: using a coating device to apply ink in the opening along a direction from the second slope angle to the first slope angle to form an organic functional layer.

[0041] In some embodiments, after applying ink in the opening, the method further includes: directing the air outlet of the drying device toward a third direction to blow air toward the ink to dry the ink; the third direction is substantially parallel to the second sloped surface of the first adjusting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, etc. involved in the embodiments of the present disclosure.

[0043] FIG1 is a structural diagram of a display device according to some embodiments;

[0044] FIG2 is a structural diagram of a display substrate according to some embodiments;

[0045] FIG3 is a structural diagram of another display substrate according to some embodiments;

[0046] FIG4 is a structural diagram of a process for forming an organic functional layer according to some embodiments;

[0047] FIG5 is a graph showing relative heights of organic functional layers according to some embodiments;

[0048] FIG6 is another structural diagram of a process for forming an organic functional layer according to some embodiments;

[0049] FIG7 is a structural diagram of a light-emitting unit after being lit according to some embodiments;

[0050] FIG8 is a diagram illustrating a wind direction simulation during the drying process of an organic functional layer according to some embodiments;

[0051] FIG9 is another structural diagram of a display substrate according to some embodiments;

[0052] FIG10 is a cross-sectional view of the display substrate along section line EE shown in FIG9 ;

[0053] FIG11 is another cross-sectional view of the display substrate along the cross-sectional line EE according to FIG9 ;

[0054] FIG12 is another cross-sectional view of the display substrate along the cross-sectional line EE according to FIG9 ;

[0055] FIG13 is a diagram illustrating a simulated wind flow field in an opening K of a pixel defining layer according to some embodiments;

[0056] FIG14 is a diagram illustrating a simulated wind flow field in another opening K of a pixel defining layer according to some embodiments;

[0057] FIG15 is a cross-sectional view of the first adjustment portion of the display substrate shown in FIG9 along section line EE;

[0058] FIG16 is another structural diagram of a display substrate according to some embodiments;

[0059] FIG17 is a cross-sectional view of the display substrate along the cross-sectional line FF shown in FIG16 ;

[0060] FIG18 is an enlarged view of point G of the display substrate shown in FIG10 ;

[0061] FIG19 is another cross-sectional view of the display substrate along the cross-sectional line EE according to FIG9 ;

[0062] FIG20 is a cross-sectional view of the display substrate along the cross-sectional line HH shown in FIG9 ;

[0063] FIG21 is another structural diagram of a display substrate according to some embodiments;

[0064] FIG22 is another cross-sectional view of the display substrate along the cross-sectional line HH shown in FIG9 ;

[0065] FIG23 is another structural diagram of a display substrate according to some embodiments;

[0066] FIG24 is another cross-sectional view of the display substrate along the cross-sectional line EE according to FIG9 ;

[0067] FIG25 is a flow chart of a method for preparing a first adjustment portion and a planarization layer according to some embodiments;

[0068] FIG26 is a structural diagram of corresponding steps of a method for preparing a first adjustment portion and a planarization layer according to some embodiments;

[0069] FIG27 is a flow chart of a method for preparing a display substrate according to some embodiments;

[0070] FIG. 28 is another structural diagram of a display substrate according to some embodiments. DETAILED DESCRIPTION

[0071] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0072] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0073] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0074] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0075] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0076] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0077] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0078] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0079] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0080] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0081] As shown in FIG1 , some embodiments of the present disclosure provide a display device 1000 . Display device 1000 can be any device that displays either moving (e.g., video) or stationary (e.g., still images), and whether text or images. More specifically, it is contemplated that the embodiments described herein can be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones (e.g., cell phones), wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, video cameras, game consoles, watches, clocks, calculators, television monitors, flat-panel displays, computer monitors, automotive displays (e.g., speedometer displays), navigation systems, cockpit controls and / or displays, camera view displays (e.g., displays for rearview cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., displays for images of a piece of jewelry). FIG1 illustrates display device 1000 as a mobile phone.

[0082] For example, the display device 1000 may be an electroluminescent display device or a photoluminescent display device. In the case where the display device 1000 is an electroluminescent display device, the electroluminescent display device may be an organic light-emitting diode (OLED) or a quantum dot light-emitting diode (QLED). In the case where the display device 1000 is a photoluminescent display device, the photoluminescent display device may be a quantum dot photoluminescent display. The following uses the display device 1000 as a QLED display device as an example to schematically illustrate some embodiments of the present disclosure. However, the embodiments of the present disclosure include but are not limited to these, and any other display device may also be considered as long as the same technical concept is applied.

[0083] Continuing to refer to FIG. 1 , the display device 1000 includes a display substrate 100 .

[0084] As shown in Figure 2, the display substrate 100 is divided into a display area AA and a peripheral area BB located on at least one side of the display area AA. Figure 2 illustrates an example in which the peripheral area BB surrounds the display area AA. The display area AA is provided with multiple subpixels P. The subpixels P include at least a red subpixel R, a green subpixel G, and a blue subpixel B. For example, a red subpixel R, a green subpixel G, and a blue subpixel B, arranged in sequence, form a pixel PP.

[0085] In some embodiments, as shown in FIG3 , a light-emitting unit 10 is disposed in the region where the sub-pixels P of the display substrate 100 are located. For example, the display substrate 100 includes a substrate 11 and a pixel defining layer 12 located on one side of the substrate 11. The pixel defining layer 12 is provided with a plurality of openings K, and the plurality of light-emitting units 10 are disposed in the plurality of openings K in a one-to-one correspondence.

[0086] Exemplarily, the light emitting unit 10 includes: an anode 1a, a hole injection layer 1b, a hole transport layer 1c, a light emitting layer 1d, an electron transport layer 1e, an electron injection layer 1f and a cathode 1g, etc., which are not limited here.

[0087] The hole injection layer 1b, the hole transport layer 1c and the light emitting layer 1d may be made of organic materials.

[0088] When forming the organic functional layer 30, commonly used film-forming processes include inkjet printing, slit coating, spin coating and screen printing. As shown in Figure 4, the organic functional layer 30 can be formed by a nozzle coating film-forming process. During this process, the coating device 200 coats the ink used to form the organic functional layer 30 in the opening K of the pixel defining layer 12.

[0089] On the one hand, the inventors of the present disclosure have discovered that after coating using a full-coating technique such as blade coating or slit coating, the thickness of the formed organic functional layer 30 in the opening K has a problem of poor uniformity.

[0090] For example, as shown in Figures 4 and 5, the ink coating direction is from right to left in the horizontal direction x. After the ink is coated to form the organic functional layer 30, the relative height curve of the exposed surface of the organic functional layer 30 at the cross-section line CC is shown in Figure 5, wherein the ordinate represents the relative height of the organic functional layer 30, and the abscissa represents the extended dimension of the display substrate 100 in the horizontal direction x.

[0091] Taking the relative height segment D of an opening K in the pixel defining layer 12 as an example, a dashed line U divides this relative height segment D into two left and right portions of approximately equal size in the horizontal direction x. As can be seen in FIG5 , the relative heights of the organic functional layers 30 on the left and right sides of the dashed line U are asymmetrical. Specifically, the relative height V1 of the organic functional layer 30 on the left side of the dashed line U is higher than the relative height V2 of the organic functional layer 30 on the right side of the dashed line U.

[0092] The inventors of the present disclosure discovered that one of the reasons for the asymmetry of the curve of the relative height of the organic functional layer 30 is that, as shown in FIG4 , when the ink is coated into the opening along the horizontal direction x from right to left, a leftward shear force is generated during the coating process, and the ink has a certain viscosity, resulting in the pixel defining layer 12 having a blocking effect on the ink. In each opening K, the ink is concentrated more on the left side of the opening K, and the ink climbing at the edge of the pixel defining layer 12 on the left side of the opening K is more serious, resulting in the organic functional layer 30 formed on the left side of the opening K being relatively thick, thereby making the relative height of the surface wheel of the organic functional layer 30 at this location higher, resulting in poor thickness uniformity of the organic functional layer 30.

[0093] On the other hand, as shown in Figure 6, the inventors of the present disclosure also found that after the ink is applied to the opening K, when a drying device 300 is used to blow air to the ink to remove excess solvent in the ink to form the organic functional layer 30, the thickness of the organic functional layer 30 becomes uneven along the blowing direction.

[0094] For example, as shown in Figures 6 and 7, the drying device 300 is located on the right side of the opening K, and the air outlet of the drying device 300 blows air toward the ink in the direction of the lower left side of the pixel defining layer 12 to remove excess solvent in the ink. At this time, the portion 3a of the organic functional layer 30 on its right side near the pixel defining layer 12 is relatively thick. After the light-emitting unit 10 is lit, there is a problem of dark light output at the location of the relatively thick portion 3a of the organic functional layer 30.

[0095] For example, as shown in Figures 6 and 8, when a drying device 300 is used to blow air into the ink to remove excess solvent in the ink, due to the blocking effect of the pixel defining layer 12, a tiny vortex airflow will be formed at the edge 12a of the pixel defining layer 12, resulting in the organic functional layer 30 having a thicker film thickness at the location with the vortex airflow, affecting the uniformity of the thickness of the organic functional layer 30.

[0096] Therefore, when the coating device 200 is used to coat the ink used to form the organic functional layer 30 in the opening K of the pixel defining layer 12, and when the drying device 300 is used to blow air into the ink to remove excess solvent in the ink, due to the blocking effect of the pixel defining layer 12, the thickness uniformity of the organic functional layer 30 will be poor, thereby reducing the display effect of the display substrate 100.

[0097] Based on this, as shown in FIG. 9 and FIG. 10 , an embodiment of the present disclosure provides a display substrate 100 , which includes a substrate 11 and a pixel defining layer 12 located on one side of the substrate 11 .

[0098] For example, the substrate 11 may be made of glass, metal, or any flexible material.

[0099] The pixel defining layer 12 includes a plurality of first retaining walls 13 and a plurality of second retaining walls 14. The first retaining walls 13 extend along a first direction Y, and the second retaining walls 14 extend along a second direction X, with the first direction Y and the second direction X intersecting. The plurality of first retaining walls 13 and the plurality of second retaining walls 14 are connected and enclose a plurality of openings K, and the plurality of light-emitting units 10 are positioned in the plurality of openings K in a one-to-one correspondence.

[0100] It should be noted that there is no limitation on the specific number of "plurality". For example, "plurality" means "at least two".

[0101] The first direction Y intersects the second direction X, which means that there is an angle between the first direction Y and the second direction X. For example, the first direction Y and the second direction X are perpendicular to each other. For example, the angle between the first direction Y and the second direction X is an acute angle.

[0102] For example, as shown in Figures 2 and 9 , the embodiments of the present disclosure are described using the example of a first direction Y and a second direction X being perpendicular to each other. The first direction Y is the column direction, and the second direction X is the row direction. Multiple second retaining walls 14 and multiple first retaining walls 13 are arranged in multiple rows and columns. The first retaining walls 13 extend in the column direction, and the second retaining walls 14 extend in the row direction. In this case, the multiple openings K formed by the multiple first retaining walls 13 and the multiple second retaining walls 14 are used to accommodate ink to form the organic functional layer 30 of the multiple sub-pixels P. As shown in Figure 10 , at least one of the multiple first retaining walls 13 has a first adjustment portion 151 disposed on a side proximal to the substrate 11. Along the second direction X, the height h1 of the first adjustment portion 151 gradually increases and then gradually decreases. The height h1 represents the dimension of the first adjustment portion 151 in the direction Z perpendicular to the substrate 11. In an orthographic projection onto the substrate 11, the first retaining walls 13 and the first adjustment portion 151 overlap.

[0103] In some embodiments, as shown in Figure 11, a first virtual auxiliary line J1 is constructed between the highest point O1 of the first retaining wall 13 and the substrate 11, and a second virtual auxiliary line J2 is constructed between the highest point O2 of the first adjustment portion 151 and the substrate 11, wherein the first virtual auxiliary line J1 and the second virtual auxiliary line J2 do not overlap.

[0104] It should be noted that the highest point O1 of the first retaining wall 13 refers to the position where the distance between the first retaining wall 13 and the substrate 11 is the maximum along the direction Z perpendicular to the substrate 11 .

[0105] The first adjusting portion 151 includes two parts 15 a and 15 b . The first part 15 a of the first adjusting portion 151 is located farther from the second virtual auxiliary line J2 than the second part 15 b and is located outside the first retaining wall 13 .

[0106] It should be noted that at least part 15a of the second virtual auxiliary line J2 of the first adjustment portion 151 away from the first adjustment portion 151 is located outside the first retaining wall 13. It can be understood that at least part 15a of the second virtual auxiliary line J2 of the first adjustment portion 151 away from the first adjustment portion 151 is not covered by the first retaining wall 13.

[0107] For example, as can be seen from FIG10 , along the second direction X, the height h1 of the first adjustment portion 151 first gradually increases and then gradually decreases. That is, along the second direction X, the surface of the first adjustment portion 151 away from the substrate 11 is a sloped surface. When the height h1 of the first adjustment portion 151 gradually increases to a maximum, this height h1 is the maximum height h1a of the first adjustment portion 151.

[0108] For example, as shown in FIG10 , in an orthographic projection onto the substrate 11, the first retaining wall 13 does not completely cover the first adjustment portion 151. A portion 15a of the first adjustment portion 151 on one side along the second direction X is located outside the first retaining wall 13. Because the first retaining wall 13 does not completely cover the first adjustment portion 151, the surface forming the first retaining wall 13 is uneven due to the influence of the first adjustment portion 151. Due to the structural influence of the first adjustment portion 151, the first retaining wall 13 forms an asymmetric sloped surface. For example, the first retaining wall 13 includes a third sloped surface N3 and a fourth sloped surface N4. The fourth sloped surface N4 has a smaller slope angle than the third sloped surface N3. For a detailed description of the structure of the first retaining wall 13, please refer to the following content and will not be elaborated here.

[0109] By gradually increasing and then gradually decreasing the height h1 of the first adjustment portion 151, a sloped surface with an uneven gradient can be formed on the surface of the first adjustment portion 151 away from the substrate 11. Furthermore, in an orthographic projection onto the substrate 11, the first retaining wall 13 and the first adjustment portion 151 overlap, and at least a portion 15a of the first adjustment portion 151 away from the highest point of the first adjustment portion 151 is located outside the first retaining wall 13. This configuration can result in the first retaining wall 13 having an asymmetric sloped surface.

[0110] Since the first retaining wall 13 has an asymmetric sloped surface, the first retaining wall 13 may have a fourth sloped surface N4 with a relatively small slope. When the coating device 200 applies ink against the fourth sloped surface N4 with a smaller slope of the first retaining wall 13, the sloped surface has a smaller blocking effect on the ink, thereby reducing the degree of ink accumulation at the edge of the first retaining wall 13, alleviating the problem of the edge of the organic functional layer 30 climbing, and improving the thickness uniformity of the organic functional layer 30.

[0111] Furthermore, since the first retaining wall 13 has a fourth sloped surface N4 with a relatively small slope, when the drying device 300 is used to dry the ink, the blowing direction of the air outlet 301 of the drying device 300 is adjusted to be roughly parallel to the sloped surface with a smaller slope of the first retaining wall 13. This can reduce the vortex airflow, help improve the thickness uniformity of the organic functional layer 30, and thus improve the display effect of the display substrate 100.

[0112] Regarding the structure of the first retaining wall 13, the coordination of ink coating with the structure of the first regulating portion 151 and the first retaining wall 13, and the coordination of ink drying with the structure of the first regulating portion 151 and the first retaining wall 13, please refer to the subsequent content and will not be described in detail here.

[0113] For example, the surface of the first retaining wall 13 away from the substrate 11 may be an arc-shaped surface or a flat surface.

[0114] For example, the surface of the first retaining wall 13 away from the substrate 11 can be a curved surface. In this case, an auxiliary line is constructed along the direction Z perpendicular to the substrate 11 from the position where the curved surface has the maximum size away from the substrate 11 to the substrate 11. The auxiliary line is the first virtual auxiliary line J1.

[0115] For example, as shown in Figure 10, taking the surface of the first retaining wall 13 away from the substrate 11 as plane b1, the distance between plane b1 and the substrate 11 is consistent in the direction Z perpendicular to the substrate 11. That is, if the highest point O1 is located within the range of plane b1, an auxiliary line is constructed in the longitudinal cross-section of the first retaining wall 13, along the direction Z perpendicular to the substrate 11, from the midpoint of the cross-section line containing plane b1 to the substrate 11. This auxiliary line is the first virtual auxiliary line J1. The longitudinal cross-section of the first retaining wall 13 is perpendicular to the substrate 11 and extends along the second direction X.

[0116] Since the height h1 of the first adjustment portion 151 gradually increases and then gradually decreases, in the longitudinal section of the first retaining wall 13, the first adjustment portion 151 has a highest point O2. Along the direction Z perpendicular to the substrate 11, an auxiliary line is constructed from the highest point O1 of the first adjustment portion 151 to the substrate 11. The auxiliary line is the second virtual auxiliary line J2.

[0117] By setting the first virtual auxiliary line J1 and the second virtual auxiliary line J2 to be non-overlapping, when forming the first retaining wall 13, due to the influence of the first adjustment portion 151, the surface of the first retaining wall 13 is adjusted to have a sloped surface with a smaller slope. The sloped surface with a smaller slope of the first retaining wall 13 can improve the thickness uniformity of the organic functional layer 30, thereby improving the display effect of the display substrate 100.

[0118] In some embodiments, as shown in FIG. 10 , in the same opening K, the second virtual auxiliary line J2 of the first adjustment portion 151 is closer to the center L1 of the opening K than the first virtual auxiliary line J1 of the first retaining wall 13 .

[0119] Exemplarily, as shown in FIG. 10 , on the right side of the opening K, the second virtual auxiliary line J22 of the first adjusting portion 151 is closer to the center L1 of the opening K than the first virtual auxiliary line J12 of the first retaining wall 13 .

[0120] By arranging the second virtual auxiliary line J22 of the first adjustment portion 151 closer to the center L1 of the opening K than the first virtual auxiliary line J12 of the first retaining wall 13 in the same opening K, a sloped surface with a gentler slope can be provided on the left side of the first virtual auxiliary line J12 of the first retaining wall 13. The sloped surface with a smaller slope of the first retaining wall 13 can improve the thickness uniformity of the organic functional layer 30, thereby improving the display effect of the display substrate 100.

[0121] In some embodiments, as shown in FIG. 10 , in the same opening K, the second virtual auxiliary line J21 of the first adjustment portion 151 is farther away from the center L1 of the opening K than the first virtual auxiliary line J11 of the first retaining wall 13 .

[0122] Exemplarily, as shown in FIG. 10 , on the left side of the opening K, the second virtual auxiliary line J21 of the first adjusting portion 151 is farther away from the center L1 of the opening K than the first virtual auxiliary line J11 of the first retaining wall 13 .

[0123] In some embodiments, as shown in FIG. 12 , in the same opening K, the second virtual auxiliary line J23 of the first adjustment portion 151 is farther away from the center L1 of the opening K than the first virtual auxiliary line J13 of the first retaining wall 13 .

[0124] Exemplarily, as shown in FIG. 12 , on the right side of the opening K, the second virtual auxiliary line J23 of the first adjusting portion 151 is farther away from the center L1 of the opening K than the first virtual auxiliary line J13 of the first retaining wall 13 .

[0125] Regarding the effect of reducing vortex airflow when the first retaining wall 13 has a sloped surface with a relatively small slope, the following example is provided.

[0126] Figure 13 is a simulation diagram of the wind flow field in the opening K of the pixel defining layer 12, and Figure 14 is a simulation diagram of the wind flow field in another opening K of the pixel defining layer 12. Among them, in Figures 13 and 14, the diagram on the right represents the magnitude of the wind force. In Figures 13 and 14, the height of the pixel defining layer 12 is consistent, that is, the size of the pixel defining layer 12 is consistent in the vertical coordinate direction. The difference is that the slope angle of the pixel defining layer 12 in Figure 13 is c1, and the slope angle of the pixel defining layer 12 in Figure 14 is c2, wherein c1 is greater than c2. In Figure 14, when the slope angle of the pixel defining layer 12 is smaller, the pixel defining layer 12 has a sloped surface with a smaller slope.

[0127] As can be seen from Figures 13 and 14 , when the slope angle of the pixel defining layer 12 is large, a viscous layer forms near the bottom of the opening K, resulting in uneven wind force. Furthermore, vortices occur near the slope angle, further exacerbating the uneven microscopic flow of wind force, which in turn leads to uneven thickness of the formed organic functional layer 30. However, when the slope angle of the pixel defining layer 12 is small, the influence of the gently sloping surface of the pixel defining layer 12 effectively reduces or even eliminates vortices, promoting uniform thickness of the organic functional layer 30.

[0128] Therefore, FIG. 13 and FIG. 14 further demonstrate that when the first retaining wall 13 has a sloped surface with a smaller slope, it is beneficial to the formation of the organic functional layer 30 with a higher thickness uniformity, thereby improving the display effect of the display substrate 100 .

[0129] 10 and 15 , in a longitudinal section of the first adjustment portion 151 , portions on both sides of the second virtual auxiliary line J2 of the first adjustment portion 151 have different height change rates. The longitudinal section of the first adjustment portion 151 is perpendicular to the substrate 11 and extends along the second direction X.

[0130] For example, in a longitudinal cross-section of the first adjustment portion 151, along the second direction X, a height h1 of the first adjustment portion 151 gradually increases and then gradually decreases, where the height h1 is the dimension of the first adjustment portion 151 in a direction Z perpendicular to the substrate 11. The different height change rates of the portions of the first adjustment portion 151 located on both sides of the second virtual auxiliary line J2 mean that, within a fixed dimension along the second direction X, the increase in the height h1 of the portion of the first adjustment portion 151 located to the left of the second virtual auxiliary line J2 is different from the decrease in the height h1 of the portion of the first adjustment portion 151 located to the right of the second virtual auxiliary line J2.

[0131] 10 , along the second direction X, the height change rate of the portion located to the left of the second virtual auxiliary line J2 of the first adjustment portion 151 is smaller, and the height change rate of the portion located to the right of the second virtual auxiliary line J2 of the first adjustment portion 151 is larger.

[0132] Illustratively, in the longitudinal section of the first adjustment portion 151 , the parts on both sides of the second virtual auxiliary line J2 of the first adjustment portion 151 are respectively the first part W1 and the second part W2 , and the first part W1 and the second part W2 are asymmetrically arranged relative to the second virtual auxiliary line J2 of the first adjustment portion 151 .

[0133] It can be understood that the longitudinal section of the first adjusting portion 151 is the section in the cross-sectional view of the first adjusting portion 151 taken along the section line EE in FIG. 9 .

[0134] For example, as shown in Figures 10 and 15, the height h1 of the first adjustment portion 151 gradually increases and then gradually decreases, and the height change rates of the parts located on both sides of the second virtual auxiliary line J2 of the first adjustment portion 151 are different. In this way, two different sloped surfaces are obtained on both sides of the second virtual auxiliary line J2 of the first adjustment portion 151, which are respectively represented as the first sloped surface N1 and the second sloped surface N2.

[0135] In some embodiments, as shown in Figures 10 and 15, the first adjustment portion 151 includes a first sloped surface N1 and a second sloped surface N2. The angle formed between the first sloped surface N1 and the substrate 11 is a first slope angle α1, and the angle formed between the second sloped surface N2 and the substrate 11 is a second slope angle α2. The first slope angle α1 and the second slope angle α2 are not equal.

[0136] By setting different height change rates for the portions of the first adjustment portion 151 located on either side of the second virtual auxiliary line J2 along the second direction X, two sloped surfaces with different slope angles can be obtained. By positioning the first adjustment portion 151 on the side of the first retaining wall 13 closer to the substrate 11, the first retaining wall 13 has a sloped surface with a smaller slope, which helps ensure uniform thickness of the organic functional layer 30 and improves the display quality of the display substrate 100.

[0137] It can be understood that when the maximum height h1a of the first adjustment portion 151 is fixed and the dimension d1 of the first adjustment portion 151 along the second direction X is fixed, a decrease in the slope angle on one side of the first adjustment portion 151 will be accompanied by an increase in the slope angle on the other side of the first adjustment portion 151.

[0138] That is, by setting different height change rates for the portions on both sides of the second virtual auxiliary line J2 of the first adjustment portion 151 along the second direction X, a sloped surface with a further reduced slope angle can be formed, for example, a second sloped surface N2 with a reduced second slope angle α2. The second sloped surface N2 with a smaller second slope angle α2 can ensure that the first retaining wall 13 partially overlapping the first adjustment portion 151 has a sloped surface with a smaller slope, thereby obtaining an organic functional layer 30 with a higher thickness uniformity, thereby improving the display effect of the display substrate 100.

[0139] It should be noted that the dimension d1 of the first adjustment portion 151 along the second direction X refers to the maximum dimension of the first adjustment portion 151 along the second direction X.

[0140] In some embodiments, as shown in FIG. 10 and FIG. 15 , the first slope angle α1 is greater than the second slope angle α2 .

[0141] Exemplarily, as shown in FIG10 and FIG15 , the first slope angle α1 is closer to the second virtual auxiliary line J2 of the first adjustment portion 151 than the second slope angle α2 , so that the slope of the formed second slope surface N2 is smaller.

[0142] By setting the first slope angle α1 to be greater than the second slope angle α2, a first slope surface N1 and a second slope surface N2 with different slopes can be obtained.

[0143] In some examples, the difference between the first slope angle α1 and the second slope angle α2 ranges from 5° to 55°.

[0144] Illustratively, the difference between the first slope angle α1 and the second slope angle α2 is 5°, 10°, 15°, 30°, 35°, 45°, or 55°, etc., which is not limited here.

[0145] By setting the difference between the first slope angle α1 and the second slope angle α2 to be in the range of 5° to 65°, the first adjustment portion 151 can have two slope angles of different sizes, so that the slope of the second slope surface N2 of the first adjustment portion 151 is smaller.

[0146] Exemplarily, the first slope angle α1 ranges from 35° to 70°. For example, the first slope angle α1 is 35°, 40°, 50°, 60°, or 70°, etc., which is not limited here.

[0147] Exemplarily, the second slope angle α2 ranges from 15° to 50°. For example, the second slope angle α2 is 15°, 20°, 30°, 35°, 45° or 50°, etc., which is not limited here.

[0148] By setting the angle range of the first slope angle α1 to 35°~70° and the angle range of the second slope angle α2 to 15°~50°, the first adjustment part 151 can obtain two slope surfaces with different slope angles while meeting the feasibility of the manufacturing process, and the first adjustment part 151 has a second slope surface N2 with a smaller slope angle, so as to obtain a first retaining wall 13 with a slope surface with a smaller slope.

[0149] In some embodiments, as shown in Figures 10 and 15 , the first adjustment portion 151 includes a first sloped surface N1 and a second sloped surface N2. The first sloped surface N1 forms a first slope angle α1 with the substrate 11, and the second sloped surface N2 forms a second slope angle α2 with the substrate 11. The first slope angle α1 is greater than the second slope angle α2. In an orthographic projection onto the substrate 11, the portion of the second sloped surface N2 away from the first sloped surface N1 is located outside the first retaining wall 13.

[0150] Exemplarily, as shown in FIG. 10 , in the orthographic projection onto the substrate 11 , the first retaining wall 13 does not cover the portion of the second sloped surface N2 away from the first sloped surface N1 , and the remaining portion 15 b of the first adjustment portion 151 is covered by the first retaining wall 13 .

[0151] It is understandable that when the first retaining wall 13 is formed on the side of the first adjusting portion 151 away from the substrate 11 , the second sloped surface N2 of the first adjusting portion 151 with a smaller slope helps to form the first retaining wall 13 with a smaller slope.

[0152] For example, as shown in Figure 10, in a longitudinal cross-section, the first retaining wall 13 has an irregular trapezoidal shape. The longitudinal cross-section of the first retaining wall 13 is perpendicular to the substrate 11 and extends along the second direction X. The first retaining wall 13 includes a third sloped surface N3 and a fourth sloped surface N4. The fourth sloped surface N4 of the first retaining wall 13 overlaps with the second sloped surface N2 of the first adjustment portion 151. The fourth sloped surface N4 has a lower slope than the third sloped surface N3. The first retaining wall 13 having the fourth sloped surface N4 with a lower slope facilitates achieving a more uniform thickness of the organic functional layer 30, thereby improving the display quality of the display substrate 100.

[0153] In some embodiments, as shown in FIG. 10 , FIG. 16 and FIG. 17 , the display substrate 100 further includes: a plurality of first electrodes 16 , and the plurality of first electrodes 16 are disposed in a one-to-one correspondence with the plurality of openings K.

[0154] 3 and 16 , the first electrode 16 may be the anode 1a of the light-emitting unit 10. In other examples, the cathode 1g of the light-emitting unit 10 is closer to the substrate 11 than the anode 1a of the light-emitting unit 10. In this case, the first electrode 16 may be the cathode 1g of the light-emitting unit 10, but this is not limited thereto.

[0155] At least one first electrode 16 among the plurality of first electrodes 16 covers a portion of the second sloped surface N2 of the first adjustment portion 151 that is not covered by the first retaining wall 13 .

[0156] 10 and 17 , the first electrode 16 is located on a side of the first adjustment portion 151 away from the substrate 11 . A portion 15 a of the first adjustment portion 151 may be covered by the first electrode 16 .

[0157] By setting the first electrode 16 to cover the portion 15a of the second slope surface N2 of the first adjustment portion 151 not covered by the first blocking wall 13, the area where the portion 15a is located can be used as a light-emitting area to increase the light output area of ​​the display substrate 100 and improve the display effect of the display substrate 100.

[0158] In some embodiments, as shown in FIG18 , in an orthographic projection onto the substrate 11, the first electrode 16 overlaps the second sloped surface N2 of the first adjustment portion 151 and the first retaining wall 13. A portion 16 a of the first electrode 16 where the first sloped surface N2 of the first adjustment portion 151 and the first retaining wall 13 overlap is located between the first adjustment portion 151 and the first retaining wall 13.

[0159] In the orthographic projection onto the substrate 11, at least the portion 16a of the first electrode 16 that overlaps with the second sloped surface N2 of the first adjustment portion 151 is covered by the first retaining wall 13, so that the edge L2 of the first electrode 16 is covered by the first retaining wall 13, thereby preventing leakage breakdown problems at the edge L2 of the first electrode 16.

[0160] In some embodiments, as shown in Figure 18, in the longitudinal section of the first retaining wall 13 and the first electrode 16, the portion of the first retaining wall 13 close to the second slope surface N2 has a first angle θ1 with the first electrode 16, and the angle of the first angle θ1 is smaller than the angle of the second slope angle α2 between the first adjustment portion 151 and the substrate 11, that is, θ1<α2; the longitudinal section of the first retaining wall 13 and the first electrode 16 is perpendicular to the substrate 11 and extends along the second direction X.

[0161] On the second sloped surface N2 of the first adjustment portion 151 with a smaller slope, the angle between the first retaining wall 13 and the first electrode 16 is smaller than the second slope angle α2. This can further reduce the slope of the fourth sloped surface N4 of the first retaining wall 13, thereby facilitating obtaining an organic functional layer 30 with higher thickness uniformity, thereby improving the display effect of the display substrate 100.

[0162] In some embodiments, as shown in FIG18 , the difference between the first included angle θ1 and the second slope angle α2 ranges from 5° to 45°, that is, 5°≤α2-θ1≤45°.

[0163] For example, the difference between the first included angle θ1 and the second slope angle α2 is 5°, 10°, 15°, 30°, 35° or 45°, etc., which is not limited here.

[0164] By setting the difference between the first included angle θ1 and the second slope angle α2 to be in the range of 5° to 45°, the first retaining wall 13 on the second slope surface N2 with a relatively small slope of the first adjustment portion 151 has a fourth slope surface N4 with a relatively small slope, which is conducive to obtaining an organic functional layer 30 with higher thickness uniformity, thereby improving the display effect of the display substrate 100.

[0165] In some embodiments, as shown in FIG18 , the first angle θ1 ranges from 5° to 30°.

[0166] Exemplarily, the value of the first angle θ1 is 5°, 10°, 15°, 20°, 25° or 30°, etc., which is not limited here.

[0167] In some embodiments, as shown in FIG. 16 and FIG. 17 , in an orthographic projection onto the substrate 11 , at least one first electrode 16 among the plurality of first electrodes 16 does not overlap with the first sloped surface N1 of the first adjustment portion 151 .

[0168] Exemplarily, as shown in FIG17 , a plurality of first electrodes 16 are arranged in a plurality of rows, and a distance d2 is provided between every two adjacent first electrodes 16 in the second direction X. The larger the distance d2 is, the more conducive it is to reducing the risk of connection between adjacent sub-pixels P.

[0169] On both sides of a first adjustment portion 151 along the first direction Y are: a first electrode 161 and a second electrode 162. In the orthographic projection onto the substrate 11, the first electrode 161 overlaps with the second sloped surface N2 of the first adjustment portion 151. By setting the first electrode 162 to have no overlap with the first sloped surface N1 of the first adjustment portion 151, the distance d2 between the first electrode 161 and the first electrode 162 in the second direction X can be increased, thereby reducing the risk of connection between adjacent sub-pixels P.

[0170] In some embodiments, as shown in Figure 10, in the longitudinal section of the first retaining wall 13, the angle formed between the portion of the first retaining wall 13 away from the second sloped surface N2 and the substrate 11 is a second angle θ2, and the angle of the second angle θ2 is greater than the angle of the first angle θ1, that is, θ2>θ1.

[0171] For example, as shown in FIG10 , the first electrode 16 does not overlap with the first sloped surface N1 of the first adjustment portion 151. The surface of the first electrode 16 away from the substrate 11 is a flat surface, and this plane is parallel to the substrate 11. Therefore, the angle formed between the portion of the first retaining wall 13 away from the second sloped surface N2 and the substrate 11 is equal to the angle between the portion of the first retaining wall 13 away from the second sloped surface N2 and the first electrode 16.

[0172] By setting the second angle θ2 to be greater than the first angle θ1, the slope of the third slope surface N3 is smaller than that of the fourth slope surface N4. In the orthographic projection onto the substrate 11, this can reduce the area occupied by the first retaining wall 13, which is beneficial to increasing the aperture ratio of the display substrate 100.

[0173] In some examples, as shown in FIG10 , the difference between the second angle θ2 and the first angle θ1 ranges from 5° to 65°, that is, 5°≤θ2-θ1≤65°.

[0174] Illustratively, the difference between the second angle θ2 and the first angle θ1 is 5°, 10°, 15°, 30°, 35°, 45°, 55° or 65°, etc., which is not limited here.

[0175] By setting the difference between the second angle θ2 and the first angle θ1 to be in the range of 5° to 65°, the first retaining wall 13 has a smaller fourth slope surface N4 while also having a third slope surface N3 with a relatively larger slope, thereby achieving the purpose of increasing the aperture ratio of the display substrate 100.

[0176] Exemplarily, the second angle θ2 is in the range of 30° to 70°. For example, the second angle θ2 is 30°, 40°, 50°, 55°, 60°, 65°, or 70°, etc., which is not limited here.

[0177] In some embodiments, as shown in FIG. 19 , in an orthographic projection onto the substrate 11 , a portion of the first sloped surface N1 away from the second sloped surface N2 is located outside the first retaining wall 13 .

[0178] For example, as shown in FIG19 , in an orthographic projection onto the substrate 11, the first retaining wall 13 does not cover the portion of the second sloped surface N2 away from the first sloped surface N1, and the first retaining wall 13 does not cover the portion of the first sloped surface N1 away from the second sloped surface N2. That is, in an orthographic projection onto the substrate 11, the first retaining wall 13 is located within the first adjustment portion 151.

[0179] By arranging the first blocking wall 13 within the first adjusting portion 151 , the aperture ratio of the display substrate 100 can be increased.

[0180] In some embodiments, as shown in FIG. 19 , at least one first electrode 16 among the plurality of first electrodes 16 covers a portion of the first sloped surface N1 of the first adjustment portion 151 that is not covered by the first retaining wall 13 .

[0181] The first electrode 16 covers the portion of the first sloped surface N1 of the first adjustment portion 151 not covered by the first retaining wall 13 , so that the area where the portion is located can be used as a light-emitting area to increase the light-emitting area of ​​the display substrate 100 and improve the display effect of the display substrate 100 .

[0182] In some embodiments, as shown in Figure 19, in the orthographic projection onto the substrate 11, the first electrode 16 overlaps with the first sloped surface N1 of the first adjustment portion 151 and the first retaining wall 13; and the overlapping portion of the first electrode 16 with the first sloped surface N1 of the first adjustment portion 151 and the first retaining wall 13 is located between the first adjustment portion 151 and the first retaining wall 13.

[0183] In the orthographic projection onto the substrate 11, a portion of the first electrode 16 that overlaps with the first sloped surface N1 of the first adjustment portion 151 is covered by the first retaining wall 13, so that the edge L3 of the first electrode 16 is covered by the first retaining wall 13, thereby preventing leakage breakdown problems from occurring at the edge L3 of the first electrode 16.

[0184] In some embodiments, as shown in Figures 10 and 16, along the second direction X, there is a first interval d3 between each two adjacent first electrodes 16 among the multiple first electrodes 16; a portion of the first retaining wall 13 is filled in the first interval d3, and in the orthographic projection onto the substrate 11, the first virtual auxiliary line J1 of the first retaining wall 13 is located within the range of the first interval d3.

[0185] Exemplarily, along the second direction X, multiple first electrodes 16 are arranged in sequence at intervals, and the edge L2 of the first electrode 16 overlapping with the second sloped surface N2 of the first adjustment portion 151, and the edge L3 of the first electrode 16 close to the first sloped surface N1 of the first adjustment portion 151, both need to be covered by the first retaining wall 13, so that the first retaining wall 13 can prevent leakage breakdown problems from occurring at the edge of the first electrode 16.

[0186] By setting the first virtual auxiliary line J1 of the first retaining wall 13 within the range of the first interval d3 in the orthographic projection onto the substrate 11, the probability that the maximum height h2a of the first retaining wall 13 covers the edge of the first electrode 16 is increased, thereby improving the effect of the first retaining wall 13 in preventing leakage breakdown problems from occurring at the edge of the first electrode 16.

[0187] In some embodiments, as shown in FIG. 10 , a maximum height h2a of the first retaining wall 13 is greater than a maximum height h1a of the first adjusting portion 151 .

[0188] The position where the maximum height h1a of the first adjustment portion 151 is located is the position where the second virtual auxiliary line J2 of the first adjustment portion 151 is located.

[0189] Illustratively, in the longitudinal section of the first retaining wall 13 , since the first retaining wall 13 overlaps with the first adjusting portion 151 , the height h2 of the first retaining wall 13 is uneven, and the direction Z of the height h2 of the first retaining wall 13 is perpendicular to the substrate 11 .

[0190] Since the first retaining wall 13 can cover the second virtual auxiliary line J2 of the first adjustment portion 151 and a portion of the first adjustment portion 151 on one side of the second virtual auxiliary line J2, the maximum height h2a of the first retaining wall 13 can be greater than the maximum height h1a of the first adjustment portion 151.

[0191] In some embodiments, as shown in FIG. 10 , the difference between the maximum height h1a of the first adjustment portion 151 and the maximum height h2a of the first retaining wall 13 is in the range of 0.2 μm to 1.5 μm, ie, 0.2 μm≤h2a−h1a≤1.5 μm.

[0192] Illustratively, the difference between the maximum height h1a of the first adjustment portion 151 and the maximum height h2a of the first retaining wall 13 is 0.2 μm, 0.4 μm, 0.7 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.3 μm or 1.5 μm, etc., which is not limited here.

[0193] By setting the difference between the maximum height h1a of the first adjustment portion 151 and the maximum height h2a of the first retaining wall 13 to be in the range of 0.2μm to 1.5μm, the height and relative position relationship of the first adjustment portion 151 and the first retaining wall 13 can be adjusted so that the first retaining wall 13 has an irregular trapezoidal structure, and the first retaining wall 13 has a sloped surface with a smaller slope, which helps to ensure the thickness uniformity of the organic functional layer 30 and improve the display effect of the display substrate 100.

[0194] In some embodiments, as shown in FIG. 10 , the maximum height h1a of the first adjustment portion 151 is in a range of less than or equal to 1.5 μm and greater than or equal to 0.5 μm, that is, 0.5 μm≤h1a≤1.5 μm.

[0195] For example, the maximum height h1a of the first adjustment portion 151 is 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.2 μm, 1.4 μm, or 1.5 μm, etc., which is not limited here.

[0196] By setting the maximum height h1a of the first adjustment portion 151 to be less than or equal to 1.5 μm and greater than or equal to 0.5 μm, the first adjustment portion 151 can effectively adjust the structure of the first retaining wall 13 to form a first retaining wall 13 with a smaller slope surface, which helps to ensure the thickness uniformity of the organic functional layer 30 and improve the display effect of the display substrate 100.

[0197] In some embodiments, as shown in FIG. 10 , the maximum height h2a of the first retaining wall 13 is less than or equal to 2 μm and greater than or equal to 1 μm, that is, 1 μm≤h2a≤2 μm.

[0198] Exemplarily, the maximum height h2a of the first retaining wall 13 is 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm or 2 μm, etc., which is not limited here.

[0199] Since the total thickness of the film layer of the light-emitting unit located in the opening K is generally about 0.2μm, the setting of the maximum height h2a of the first retaining wall 13 to 1μm≤h2a≤2μm can meet the use requirements of the film layer of the light-emitting unit 10 formed in the opening K.

[0200] In some embodiments, as shown in Figure 20, the display substrate 100 also includes: a second adjustment portion 152, which is provided on a side of at least one second retaining wall 14 close to the substrate 11; in the orthographic projection onto the substrate 11, the second retaining wall 14 is located within the second adjustment portion 152.

[0201] The display substrate 100 further includes: a plurality of first electrodes 16 , which are disposed in a one-to-one correspondence with the plurality of openings K; at least one first electrode 16 among the plurality of first electrodes 16 covers a portion of the second adjustment portion 152 .

[0202] For example, as shown in FIG20 , a portion of the second adjustment portion 152 along one side of the first direction X is covered by the first electrode 161, and a portion of the second adjustment portion 152 along the other side of the first direction X is covered by the first electrode 162, and the second retaining wall 14 does not completely cover the overlapping portion of the first electrode 16 and the second adjustment portion 152. That is, at the bottom edge L6 of the opening K, the first electrode 16 is not covered by the second retaining wall 14, and the side of the first electrode 16 at this position away from the substrate 11 can be used to dispose the organic functional layer 30.

[0203] As can be seen from the above description of the thickness uniformity of the organic functional layer 30 (as shown in FIG6 ), the organic functional layer 30 is prone to being thicker at the bottom edge L6 of the opening K. The first electrode 16 fills the bottom edge L6 of the opening K. When the ink climbs to a certain height from the substrate 11 , the configuration of the first electrode 16 structure can reduce the thickness of the formed organic functional layer 30 (as shown in FIG6 ), thereby improving the thickness uniformity of the organic functional layer 30 and thereby enhancing the display quality of the display substrate 100 .

[0204] Exemplarily, as shown in FIG. 20 , the second retaining wall 14 covers the edge of the first electrode 16 extending along the second direction X, thereby preventing leakage and breakdown problems from occurring at the edge of the first electrode 16 .

[0205] In some embodiments, as shown in Figure 20, the second adjustment portion 152 includes: a fifth slope surface N5 and a sixth slope surface N6, the angle formed between the fifth slope surface N5 and the substrate 11 is a third slope angle α3, the angle formed between the sixth slope surface N6 and the substrate 11 is a fourth slope angle α4, and the angle of the third slope angle α3 is approximately equal to the angle of the fourth slope angle α4, that is, α3≈α4.

[0206] By setting the third slope angle α3 and the fourth slope angle α4 to be substantially equal, the preparation of the second adjustment portion 152 is facilitated, and the preparation process of the display substrate 100 is simplified.

[0207] In some embodiments, as shown in FIG. 21 , the second adjustment portion 152 and the first adjustment portion 151 are an integrated structure.

[0208] Illustratively, during the process of forming the first adjusting portion 151 , the second adjusting portion 152 is directly formed, thereby simplifying the manufacturing process of the display substrate 100 .

[0209] In other embodiments, as shown in FIG22 , the display substrate 100 does not include the second adjustment portion 152. The second retaining wall 14 includes a seventh sloped surface N7 and an eighth sloped surface N8. The angle formed between the seventh sloped surface N7 and the substrate 11 is a fifth slope angle α5, and the angle formed between the eighth sloped surface N8 and the substrate 11 is a sixth slope angle α6. The fifth slope angle α5 and the sixth slope angle α6 are substantially equal, i.e., α5≈α6.

[0210] Exemplarily, as shown in FIG22 , the longitudinal section of the second retaining wall 14 is trapezoidal.

[0211] The second retaining wall 14 arranged in a trapezoidal shape is easy to prepare, and a plurality of openings K are formed by connecting the second retaining wall 14 arranged in a trapezoidal shape with the first retaining wall 13 .

[0212] In some embodiments, as shown in FIG. 9 , the maximum value of the dimension d4 of the first retaining wall 13 in the second direction X is greater than the maximum value of the dimension d5 of the second retaining wall 14 in the first direction Y.

[0213] Exemplarily, as shown in FIG9 , in an orthographic projection onto the substrate 11 , the area of ​​the first retaining wall 13 is greater than the area of ​​the second retaining wall 14 .

[0214] For example, as shown in Figures 3 and 9, since the area of ​​the first retaining wall 13 is relatively large when projected onto the substrate 11, it is convenient to form a via in the area covered by the first retaining wall 13. This via is used to connect the organic functional layer 30 formed by the opening K to the pixel driving circuit (not shown in the figure). For example, the organic functional layer 30 is connected to the first electrode 16, and the first electrode 16 is connected to the pixel driving circuit (not shown in the figure) through the via provided under the area covered by the first retaining wall 13, so that the pixel driving circuit drives the display substrate 100 for display. Moreover, providing the via in the area covered by the first retaining wall 13 rather than the area covered by the opening K helps maintain the flatness of the organic functional layer 30 located in the opening K, thereby improving the display effect of the display substrate 100.

[0215] In some embodiments, as shown in FIG. 23 , the second retaining wall 14 and the first retaining wall 13 are an integral structure.

[0216] For example, during the preparation process of the second retaining wall 14 and the first retaining wall 13 , the second retaining wall 14 and the first retaining wall 13 may be formed simultaneously, which can simplify the preparation process of the pixel defining layer 12 .

[0217] In other embodiments, as shown in FIG9 , the second retaining wall 14 and the first retaining wall 13 are arranged as a non-integrated structure, and at the intersection of the first retaining wall 13 and the second retaining wall 14 , part of the second retaining wall 14 covers part of the first retaining wall 13 .

[0218] For example, during the preparation of the first adjustment portion 151 and the pixel defining layer 12, the first adjustment portion 151 can be formed first, and then a first retaining wall 13 can be formed on the side of the first adjustment portion 151 away from the substrate 11, and then a second retaining wall 14 can be formed on the side of the first retaining wall 13 away from the substrate 11. By setting the second retaining wall 14 to partially cover the first retaining wall 13 at the intersection of the first retaining wall 13 and the second retaining wall 14, the second retaining wall 14 can be prevented from affecting the structure of the first adjustment portion 151 and the first retaining wall 13, so that a first retaining wall 13 with a smaller slope surface is obtained by setting the first retaining wall 13, which helps to improve the thickness uniformity of the organic functional layer 30, thereby improving the display effect of the display substrate 100.

[0219] In some embodiments, as shown in FIG24 , the display substrate 100 further includes: a planarization layer 17 , the planarization layer 17 being located between the plurality of light-emitting units 10 and the substrate 11 , and between the pixel defining layer 12 and the substrate 11 ; wherein the first adjustment portion 151 and the planarization layer 17 are an integrated structure.

[0220] Exemplarily, the display substrate 100 includes an active layer, a gate insulating layer, a gate metal layer, an interlayer insulating layer, a source / drain metal layer, and a planarization layer 17 sequentially disposed on one side of the substrate 11 .

[0221] For example, when the planarization layer 17 is formed, the first adjustment portion 151 is formed simultaneously, and the first adjustment portion 151 is made of the same material as the planarization layer 17. This can simplify the manufacturing process of the display substrate 100.

[0222] The following illustrates a method for fabricating a first adjustment portion 151 and a planarization layer 17 in which the first adjustment portion 151 and the planarization layer 17 are integrally formed. For example, a half-exposure process is used to form the first adjustment portion 151 and the planarization layer 17. As shown in Figures 25 and 26, the method for fabricating the first adjustment portion 151 and the planarization layer 17 includes steps R1 to R3.

[0223] R1. Form an initial planarization layer 170 on one side of the substrate 11.

[0224] Illustratively, the initial planarization layer 170 is formed by a coating process.

[0225] R2. Use the mask plate 18 to expose the initial planarization layer 170 to form a full exposure area material 17a and a half exposure area material 17b of the initial planarization layer 170.

[0226] Exemplarily, the mask 18 includes: a plurality of openings 18a and semi-shielding areas 18b. The semi-shielding areas 18b allow some light to pass through, corresponding to the semi-exposed areas 17b of the initial planarization layer 170. The plurality of openings 18a do not block light, corresponding to the fully exposed areas 17a of the initial planarization layer 170. After exposure, the initial planarization layer 170 forms the fully exposed areas 17a and the semi-exposed areas 17b corresponding to the positions of the openings 18a and the semi-shielding areas 18b of the mask 18.

[0227] In which, the amount of light passing through the semi-shielding area 18b gradually changes. For example, along the second direction X from left to right as shown in Figure 26, the amount of light passing through the semi-shielding area 18b gradually decreases, and the boundary L4 on the right side of each semi-shielding area 18b corresponds to the maximum height h1a position of the pre-formed first adjustment portion 151.

[0228] It should be noted that the above “correspondence” between A and B means that, in the direction Z, the orthographic projections of A and B on the substrate 11 overlap.

[0229] R3 , developing the initial planarization layer 170 , removing the portion of the fully exposed area material 17 a away from the substrate 11 , and removing the portion of the semi-exposed area material 17 b away from the substrate 11 , to form the first adjustment portion 151 and the planarization layer 17 .

[0230] Illustratively, the portion of the remaining semi-exposed area material 17b away from the substrate 11 forms the first adjustment portion 151, and the portion of the remaining semi-exposed area material 17b close to the substrate 11 and the fully exposed area material 17a form the planarization layer 17. Due to the effect of light diffraction at the boundary L4 on the right side of the semi-shielding area 18b, the first sloped surface N1 of the first adjustment portion 151 is formed.

[0231] Through the above steps R1 to R3 , the first adjustment portion 151 and the planarization layer 17 are formed into an integrated structure.

[0232] An embodiment of the present disclosure further provides a method for preparing a display substrate. As shown in FIG. 3 , FIG. 10 and FIG. 27 , the method for preparing a display substrate includes steps S1 and S2 .

[0233] S1. A first adjustment portion 151 is formed on one side of the substrate 11. Along the second direction X, a height h1 of the first adjustment portion 151 gradually increases and then gradually decreases. The height h1 is the size of the first adjustment portion 151 in the direction Z perpendicular to the substrate 11.

[0234] Exemplarily, the material of the substrate 11 may include any one of glass, metal or flexible material, and an active layer, a gate insulating layer, a gate metal layer, an interlayer insulating layer, a source-drain metal layer and a planarization layer 17 are sequentially provided on one side of the substrate 11 (as shown in FIG. 24 ). The active layer, the gate insulating layer, the gate metal layer, the interlayer insulating layer and the source-drain metal layer are used to form a thin film transistor, and drive the light-emitting unit 10 to emit light.

[0235] For the introduction of the height h1 of the first adjustment portion 151 , please refer to the above content and will not be repeated here.

[0236] S2. A pixel defining layer 12 and a plurality of light-emitting units 10 are formed on one side of the substrate 11. The pixel defining layer 12 includes: a plurality of first retaining walls 13 and a plurality of second retaining walls 14. The plurality of first retaining walls 13 extend along a first direction Y, and the plurality of second retaining walls 14 extend along a second direction X. The first direction Y and the second direction X intersect. The plurality of first retaining walls 13 and the plurality of second retaining walls 14 are connected and enclosed to form a plurality of openings K. The plurality of light-emitting units 10 are located in the plurality of openings K in a one-to-one correspondence.

[0237] Among them, in the orthographic projection onto the substrate 11, the first adjustment portion 151 is located on the side of the first retaining wall 13 close to the substrate 11, the first retaining wall 13 and the first adjustment portion 151 overlap, a first virtual auxiliary line J1 is constructed between the highest point O1 of the first retaining wall 13 and the substrate 11, and a second virtual auxiliary line J2 is constructed between the highest point O2 of the first adjustment portion 151 and the substrate 11, and the first virtual auxiliary line J1 and the second virtual auxiliary line J2 do not overlap.

[0238] The description of the relative positional relationship between the light emitting unit 10 , the first retaining wall 13 , the second retaining wall 14 , and the first adjusting portion 151 and the first retaining wall 13 may refer to the above content and will not be repeated here.

[0239] Through the above steps S1 and S2, a first retaining wall 13 having a sloped surface with a smaller slope angle can be obtained. When the coating device 200 applies ink against the sloped surface with a smaller slope of the first retaining wall 13, the sloped surface has a smaller blocking effect on the ink, thereby reducing the degree of ink accumulation at the edge of the first retaining wall 13, alleviating the problem of the edge of the organic functional layer 30 climbing, and improving the thickness uniformity of the organic functional layer 30.

[0240] When the drying device 300 is used to dry the ink, the blowing direction of the air outlet 301 of the drying device 300 is adjusted to be roughly parallel to the sloped surface with a smaller slope of the first baffle wall 13. This can reduce the vortex airflow, help improve the thickness uniformity of the organic functional layer 30, and thus improve the display effect of the display substrate 100.

[0241] The preparation method of the organic functional layer 30 of the light emitting unit 10 is introduced as follows.

[0242] In some embodiments, as shown in FIG28 , the first adjustment portion 151 includes a first sloped surface N1 and a second sloped surface N2. The angle formed between the first sloped surface N1 and the substrate 11 is a first slope angle α1, and the angle formed between the second sloped surface N2 and the substrate 11 is a second slope angle α2. The first slope angle α1 is greater than the second slope angle α2. Forming the plurality of light-emitting units 10 includes applying ink in the opening K using a coating device 200 in a direction from the second slope angle α2 to the first slope angle α1, thereby forming the organic functional layer 30.

[0243] For example, as shown in FIG9 and FIG28 , the ink is applied using a slit coating technique. A nozzle 201 of a coating device 200 is disposed between each two adjacent second retaining walls 14 . The nozzle 201 moves between the two adjacent second retaining walls 14 along the second direction X. During this process, the nozzle 201 applies ink to a row of openings K between the two adjacent second retaining walls 14 . The applied ink is used to form the organic functional layer 30 .

[0244] It should be noted that, as shown in Figure 28, the nozzle 201 applies ink to a row of openings K between two adjacent second retaining walls 14, first forming an initial functional layer 30A. After the initial functional layer 30A is dried and other process treatments, an organic functional layer 30 located in the opening K is obtained.

[0245] From the above content, it can be seen that, as shown in Figure 28, the first retaining wall 13 arranged to partially overlap with the second slope surface N2 of the first adjusting portion 151 has a fourth slope surface N4 with a smaller slope. The fourth slope surface N4 with a smaller slope angle has a smaller blocking effect on ink.

[0246] Therefore, when the coating device 200 is used to coat ink in the opening K of the display substrate 100 along the direction from the second slope angle α2 of the first adjustment portion 151 to the first slope angle α1 of the first adjustment portion 151, the coating device 200 is running against the fourth slope surface N4. The fourth slope surface N4 can reduce the blocking effect of the first retaining wall 13 on the ink, thereby reducing the accumulation of ink at the edge of the first retaining wall 13, slowing down the climbing degree of the organic functional layer 30 at the first retaining wall 13, and improving the thickness uniformity of the organic functional layer 30, thereby improving the display effect of the display substrate 100.

[0247] In some embodiments, as shown in Figure 28, after applying ink in the opening K, the step of forming the organic functional layer 30 of the light-emitting unit 10 also includes: directing the air outlet 301 of the drying device 300 toward the third direction T to blow air toward the ink, and the third direction T is roughly parallel to the second slope surface N2 of the first adjustment portion 151.

[0248] For example, as shown in FIG28 , the first retaining wall 13 partially overlaps with the second sloped surface N2 of the first adjusting portion 151. Due to the influence of the second sloped surface N2 of the first adjusting portion 151, the slope of the fourth sloped surface N4 of the first retaining wall 13 is relatively small. For example, the fourth sloped surface N4 can be substantially parallel to the second sloped surface N2.

[0249] By blowing air toward the ink through the air outlet 301 of the drying device 300 in the third direction T that is roughly parallel to the second slope surface N2 of the first adjustment portion 151, the vortex airflow formed in the opening K can be reduced due to the influence of the smaller slope of the fourth slope surface N4, which helps to improve the thickness uniformity of the organic functional layer 30, thereby improving the display effect of the display substrate 100.

[0250] As shown in FIG1 , some embodiments of the present disclosure provide a display device 1000 , which includes: a display substrate 100 as described in any of the above embodiments; and a driver chip for driving the display substrate 100 for display.

[0251] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A display substrate, comprising: substrate; a pixel defining layer, located on one side of the substrate; The pixel defining layer includes: a plurality of first retaining walls and a plurality of second retaining walls, wherein the plurality of first retaining walls extend along a first direction, and the plurality of second retaining walls extend along a second direction, wherein the first direction and the second direction intersect; the plurality of first retaining walls and the plurality of second retaining walls are connected and enclose a plurality of openings; a plurality of light-emitting units, wherein the plurality of light-emitting units are located in the plurality of openings in a one-to-one correspondence; a first adjustment portion, disposed on a side of at least one of the first retaining walls close to the substrate, wherein the height of the first adjustment portion gradually increases and then gradually decreases along the second direction, the height being the dimension of the first adjustment portion in a direction perpendicular to the substrate; and in an orthographic projection onto the substrate, the first retaining wall and the first adjustment portion overlap; A first virtual auxiliary line is constructed between the highest point of the first retaining wall and the substrate, and a second virtual auxiliary line is constructed between the highest point of the first adjusting portion and the substrate. The first virtual auxiliary line and the second virtual auxiliary line do not overlap.

2. The display substrate according to claim 1, wherein In the same opening, the second virtual auxiliary line of the first adjusting portion is closer to the center of the opening than the first virtual auxiliary line of the first retaining wall.

3. The display substrate according to claim 1, wherein In the same opening, the second virtual auxiliary line of the first adjusting portion is farther away from the center of the opening than the first virtual auxiliary line of the first retaining wall.

4. The display substrate according to any one of claims 1 to 3, wherein: In a longitudinal section of the first adjustment portion, portions located on both sides of the second virtual auxiliary line of the first adjustment portion have different height change rates; the longitudinal section is perpendicular to the substrate and extends along the second direction.

5. The display substrate according to claim 4, wherein: The first adjustment portion includes: a first sloped surface and a second sloped surface, wherein the angle formed between the first sloped surface and the substrate is a first slope angle, and the angle formed between the second sloped surface and the substrate is a second slope angle, and the angle of the first slope angle is greater than the angle of the second slope angle. The display substrate according to claim 5 , wherein: The difference between the first slope angle and the second slope angle ranges from 5° to 55°.

7. The display substrate according to claim 4 or 5, wherein: The first slope angle ranges from 35° to 70°; and / or, The second slope angle ranges from 15° to 50°.

8. The display substrate according to claim 5, wherein: In an orthographic projection onto the substrate, a portion of the second sloped surface away from the first sloped surface is located outside the first retaining wall.

9. The display substrate according to claim 8, further comprising: a plurality of first electrodes, wherein the plurality of first electrodes are arranged in a one-to-one correspondence with the plurality of openings; At least one first electrode among the plurality of first electrodes covers the second sloped surface of the first adjustment portion that is not covered The portion covered by the first retaining wall.

10. The display substrate according to claim 9, wherein: In the orthographic projection onto the substrate, the first electrode overlaps with the second sloped surface of the first adjustment portion and the first retaining wall; and the overlapping portion of the first electrode, the second sloped surface of the first adjustment portion and the first retaining wall is located between the first adjustment portion and the first retaining wall.

11. The display substrate according to claim 10, wherein: In the longitudinal section of the first retaining wall and the first electrode, the portion of the first retaining wall close to the second sloped surface has a first angle with the first electrode, and the angle of the first angle is smaller than the angle of the second slope angle; the longitudinal section of the first retaining wall and the first electrode is perpendicular to the substrate and extends along the second direction.

12. The display substrate according to claim 11, wherein: The difference between the first included angle and the second slope angle ranges from 5° to 45°.

13. The display substrate according to claim 12, wherein: The first angle ranges from 5° to 30°.

14. The display substrate according to any one of claims 9 to 13, wherein: In an orthographic projection onto the substrate, at least one first electrode among the plurality of first electrodes does not overlap with the first sloped surface of the first adjustment portion.

15. The display substrate according to claim 14, wherein: In the longitudinal section of the first retaining wall, an angle formed between a portion of the first retaining wall away from the second sloped surface and the substrate is a second angle, and the second angle is greater than the first angle.

16. The display substrate according to claim 15, wherein: The difference between the second angle and the first angle ranges from 5° to 65°.

17. The display substrate according to claim 16, wherein: The second angle ranges from 30° to 70°.

18. The display substrate according to any one of claims 9 to 13, wherein: In an orthographic projection onto the substrate, a portion of the first sloped surface away from the second sloped surface is located outside the first retaining wall.

19. The display substrate according to claim 18, wherein: At least one first electrode among the plurality of first electrodes covers a portion of the first sloped surface of the first adjustment portion that is not covered by the first retaining wall.

20. The display substrate according to claim 19, wherein In the orthographic projection onto the substrate, the first electrode overlaps with the first sloped surface of the first adjustment portion and the first retaining wall; and the overlapping portion of the first electrode, the first sloped surface of the first adjustment portion and the first retaining wall is located between the first adjustment portion and the first retaining wall.

21. The display substrate according to any one of claims 9 to 20, wherein: Along the second direction, there is a first gap between each two adjacent first electrodes among the multiple first electrodes; a portion of the first retaining wall fills the first gap, and in the orthographic projection onto the substrate, the first virtual auxiliary line of the first retaining wall is located within the range of the first gap.

22. The display substrate according to any one of claims 1 to 21, wherein: The maximum height of the first retaining wall is greater than the maximum height of the first adjusting portion.

23. The display substrate according to claim 22, wherein: The difference between the maximum height of the first adjusting portion and the maximum height of the first retaining wall is in a range of 0.2 μm to 1.5 μm.

24. The display substrate according to claim 23, wherein: The maximum height of the first adjustment portion is in the range of less than or equal to 1.5 μm and greater than or equal to 0.5 μm; and / or, The maximum height of the first retaining wall is in the range of less than or equal to 2 μm and greater than or equal to 1 μm.

25. The display substrate according to any one of claims 1 to 24, further comprising: a second adjusting portion, provided on a side of at least one of the second retaining walls close to the substrate; In an orthographic projection onto the substrate, the second retaining wall is located within the second adjustment portion; A plurality of first electrodes are provided, the plurality of first electrodes being arranged in a one-to-one correspondence with the plurality of openings; and at least one first electrode among the plurality of first electrodes covers a portion of the second regulating portion.

26. The display substrate according to claim 25, wherein: The second adjustment portion includes: a fifth slope surface and a sixth slope surface, the angle formed between the fifth slope surface and the substrate is a third slope angle, the angle formed between the sixth slope surface and the substrate is a fourth slope angle, and the angle of the third slope angle is approximately equal to the angle of the fourth slope angle.

27. The display substrate according to claim 25 or 26, wherein: The second adjusting portion and the first adjusting portion are an integrated structure.

28. The display substrate according to any one of claims 1 to 24, wherein: The second retaining wall includes: a seventh slope surface and an eighth slope surface, the angle formed between the seventh slope surface and the substrate is a fifth slope angle, the angle formed between the eighth slope surface and the substrate is a sixth slope angle, and the angle of the fifth slope angle is approximately equal to the angle of the sixth slope angle.

29. The display substrate according to claim 28, wherein The maximum value of the dimension of the first retaining wall in the second direction is greater than the maximum value of the dimension of the second retaining wall in the first direction.

30. The display substrate according to claim 28 or 29, wherein: The second retaining wall and the first retaining wall are an integrated structure.

31. The display substrate according to claim 28 or 29, wherein: At the intersection of the first retaining wall and the second retaining wall, a portion of the second retaining wall covers a portion of the first retaining wall.

32. The display substrate according to any one of claims 1 to 31, further comprising: a planarization layer, located between the plurality of light-emitting units and the substrate, and between the pixel definition layer and the substrate; The first regulating portion and the planarization layer are an integrated structure.

33. A method for preparing a display substrate, comprising: forming a first regulating portion on one side of the substrate; Along the second direction, the height of the first adjusting portion gradually increases and then gradually increases. Reduce, the height is the dimension of the first adjusting portion in a direction perpendicular to the substrate; A pixel defining layer and a plurality of light-emitting units are formed on one side of the substrate, the pixel defining layer comprising: a plurality of first retaining walls and a plurality of second retaining walls, the plurality of first retaining walls extending along a first direction, the plurality of second retaining walls extending along a second direction, the first direction and the second direction intersecting; the plurality of first retaining walls and the plurality of second retaining walls being connected and enclosing a plurality of openings, the plurality of light-emitting units being located in the plurality of openings in a one-to-one correspondence; In which, in the orthographic projection onto the substrate, the first retaining wall and the first adjustment portion overlap, and the first adjustment portion is located on the side of the first retaining wall close to the substrate; a first virtual auxiliary line is constructed between the highest point of the first retaining wall and the substrate, and a second virtual auxiliary line is constructed between the highest point of the first adjustment portion and the substrate, and the first virtual auxiliary line and the second virtual auxiliary line do not overlap.

34. The method for preparing a display substrate according to claim 33, wherein: The first adjusting portion includes: a first sloped surface and a second sloped surface, wherein the angle formed between the first sloped surface and the substrate is a first slope angle, and the angle formed between the second sloped surface and the substrate is a second slope angle, and the angle of the first slope angle is greater than the angle of the second slope angle; Forming the plurality of light-emitting units includes: A coating device is used to coat ink in the opening along a direction from the second slope angle to the first slope angle to form an organic functional layer.

35. The method for preparing a display substrate according to claim 34, wherein: After applying ink in the opening, the method further includes: directing the air outlet of the drying device toward a third direction to blow air toward the ink to dry the ink; the third direction is substantially parallel to the second sloped surface of the first adjusting portion.

Images