CN217426754U

CN217426754U - Display substrate and display device

Info

Publication number: CN217426754U
Application number: CN202220722563.1U
Authority: CN
Inventors: 崔颖; 代青; 张月
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-09-13
Anticipated expiration: 2032-03-30

Abstract

The disclosure provides a display substrate and a display device. The display substrate includes a plurality of sub-pixels, the display substrate including: the pixel limiting layer comprises a first retaining wall, a second retaining wall and a third retaining wall; the first retaining wall and the second retaining wall are used for forming opening areas of the sub-pixels, the first retaining wall is located between the opening areas of the sub-pixels which are different in color and adjacent to each other, and the second retaining wall is located between the opening areas of the sub-pixels which are same in color and adjacent to each other; the third retaining wall is arranged on one side, away from the substrate base plate, of the first retaining wall, and the orthographic projection of the third retaining wall on the substrate base plate is located in the orthographic projection range of the first retaining wall on the substrate base plate; the surface of one side, far away from the substrate base plate, of the first retaining wall is higher than the surface of one side, far away from the substrate base plate, of the second retaining wall and is lower than the surface of one side, far away from the substrate base plate, of the third retaining wall.

Description

Display substrate and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display device.

Background

Organic Light-Emitting diodes (OLEDs) have the advantages of self-luminescence, wide viewing angle, fast response time, high Light-Emitting efficiency, low operating voltage, simple manufacturing process, and the like, and are known as next-generation "star" Light-Emitting devices.

Quantum Dot Light Emitting Diodes (QLEDs) have a narrower emission spectrum, a purer display color and a wider color gamut, so the QLEDs are also paid attention to the display industry and become a powerful candidate for the next generation of display technology.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a display substrate including a plurality of sub-pixels, the display substrate including:

the pixel limiting layer comprises a first retaining wall, a second retaining wall and a third retaining wall;

the first retaining wall and the second retaining wall are used for forming opening areas of the sub-pixels, the first retaining wall is located between the opening areas of the sub-pixels which are different in color and adjacent to each other, and the second retaining wall is located between the opening areas of the sub-pixels which are same in color and adjacent to each other;

the third retaining wall is arranged on one side, deviating from the substrate base plate, of the first retaining wall, and the orthographic projection of the third retaining wall on the substrate base plate is located in the orthographic projection range of the first retaining wall on the substrate base plate; the surface of one side, far away from the substrate base plate, of the first retaining wall is higher than the surface of one side, far away from the substrate base plate, of the second retaining wall and is lower than the surface of one side, far away from the substrate base plate, of the third retaining wall.

In an alternative implementation manner, the sub-pixels with different colors and adjacent to each other are arranged along a row direction, and the sub-pixels with the same color and adjacent to each other are arranged along a column direction;

in the row direction, the orthographic projection of the third retaining wall on the substrate base plate is positioned in the orthographic projection range of the first retaining wall on the substrate base plate.

In an optional implementation manner, in the row direction, an orthographic projection of the third retaining wall on the substrate base plate is located in the middle of an orthographic projection of the first retaining wall on the substrate base plate.

In an alternative implementation manner, in the column direction, an orthographic projection of the third retaining wall on the substrate base plate is located within an orthographic projection range of the second retaining wall on the substrate base plate; alternatively, the first and second electrodes may be,

in the column direction, the orthographic projection of the third retaining wall on the substrate base plate is completely overlapped with the orthographic projection of the second retaining wall on the substrate base plate; alternatively, the first and second electrodes may be,

in the column direction, the orthographic projection of the third retaining wall on the substrate base plate covers the orthographic projection of the second retaining wall on the substrate base plate.

In an alternative implementation manner, in the column direction, an orthographic projection of the third retaining wall on the substrate base plate covers an orthographic projection of the opening region on the substrate base plate.

In an optional implementation manner, third retaining walls respectively positioned on one sides, away from the substrate base plate, of two adjacent first retaining walls are arranged in axial symmetry relative to a symmetry axis; the extending direction of the symmetry axis is the row direction, and the two first retaining walls are adjacently arranged in the row direction.

In an alternative implementation manner, in the column direction, a plurality of the third retaining walls are arranged at intervals, and a distance between two adjacent third retaining walls is greater than or equal to a size of an opening region of at least one sub-pixel.

In an alternative implementation manner, in the column direction, a pitch of two adjacent third retaining walls is smaller than or equal to a size of ten sub-pixels.

In an optional implementation manner, in the row direction, a distance between an orthographic projection boundary of the third retaining wall on the substrate base plate and an orthographic projection boundary of the first retaining wall on the substrate base plate is greater than or equal to 0.5 micrometer and less than or equal to 10 micrometers.

In an optional implementation manner, the first retaining wall, the second retaining wall and the third retaining wall are made of fluorine-containing photoresist, the fluorine content in the first retaining wall is greater than that in the second retaining wall, and the fluorine content in the third retaining wall is greater than that in the second retaining wall; alternatively, the first and second electrodes may be,

the material of first barricade with the third barricade is fluorine-containing photoresist, the material of second barricade is fluorine-free photoresist.

In an alternative implementation manner, the first retaining wall includes a first material layer and a second material layer which are stacked, and the second material layer is located on a side of the first material layer facing away from the substrate; wherein the first material layer has lyophilic properties and the second material layer has lyophobic properties.

In an alternative implementation, the second barrier has lyophilic properties.

In an alternative implementation, at least a portion of the third retaining wall has lyophobic properties.

In an alternative implementation, the display substrate further includes an organic material layer disposed in the opening region;

the surface of one side, away from the substrate base plate, of the organic material layer is higher than the surface of one side, away from the substrate base plate, of the second retaining wall and lower than the surface of one side, away from the substrate base plate, of the first retaining wall.

In an alternative implementation manner, in a direction perpendicular to the substrate base plate, the height of the first retaining wall is greater than or equal to 0.5 micrometer and less than or equal to 2.0 micrometers; and/or the presence of a gas in the gas,

in the direction vertical to the substrate base plate, the height of the second retaining wall is more than or equal to 0.3 micrometer and less than or equal to 2.0 micrometer; and/or the presence of a gas in the gas,

in the direction perpendicular to the substrate base plate, the height of the third retaining wall is greater than or equal to 0.3 micrometer and less than or equal to 2.0 micrometers.

In an alternative implementation manner, in the row direction, the thickness of the first retaining wall is greater than or equal to 5 micrometers and less than or equal to 100 micrometers; and/or the presence of a gas in the atmosphere,

in the row direction, the thickness of the second retaining wall is greater than or equal to 5 micrometers and less than or equal to 100 micrometers.

In an alternative implementation manner, an orthographic projection shape of the third retaining wall on the substrate base plate includes at least one of: triangular, rectangular, square, diamond, trapezoidal, parallelogram, oval, and circular.

The present disclosure provides a display device including any one of the display substrates.

The foregoing description is only an overview of the technical solutions of the present disclosure, and the embodiments of the present disclosure are described below in order to make the technical means of the present disclosure more clearly understood and to make the above and other objects, features, and advantages of the present disclosure more clearly understandable.

Drawings

In order to clearly illustrate the embodiments of the present disclosure or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts. It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely illustrative of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality.

Fig. 1 schematically shows a schematic plan view of a first display substrate;

FIG. 2 schematically shows a cross-sectional view along AA' of a first display substrate;

FIG. 3 schematically shows a cross-sectional view along BB' of a first display substrate;

fig. 4 schematically shows a schematic plan structure of a second display substrate;

fig. 5 schematically shows a plan view of a third display substrate;

fig. 6 schematically shows a plan view of a fourth display substrate;

FIG. 7 schematically shows a cross-sectional structure of a fourth display substrate along CC';

fig. 8 schematically shows a plan view of a fifth display substrate;

fig. 9 schematically shows a schematic plan structure view of a sixth display substrate;

FIG. 10 is a schematic plan view showing several third retaining walls;

fig. 11 schematically shows a schematic cross-sectional structure of a display substrate on which the preparation of the anode layer is completed;

fig. 12 is a schematic cross-sectional view of the display substrate after the second barrier preparation;

FIG. 13 is a schematic cross-sectional view of a display substrate with a first retaining wall prepared;

fig. 14 is a schematic cross-sectional view showing a display substrate on which a third barrier preparation is completed;

fig. 15 is a schematic sectional view schematically showing a display substrate on which the preparation of the organic material layer is completed;

fig. 16 schematically shows a cross-sectional structure diagram of a display substrate on which the cathode layer preparation is completed.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the field of light emitting devices, a solution process is usually adopted to prepare organic thin films such as a light emitting functional layer. Wherein the solution process includes but is not limited to inkjet printing, spin coating, screen printing, and transfer printing. In the solution process, the ink in the opening area is easy to generate the 'climbing effect'. The climbing effect refers to that the liquid level of a solution at a position where the solution is contacted with a solid is higher than that at a position far away from the solid-liquid contact position due to the influence of factors such as the characteristics of the solution and the surface tension. The climbing effect causes the thickness of the film close to the position of the retaining wall to be larger, and the uneven thickness of the film in the opening area further causes the uneven brightness of the pixel, thereby seriously affecting the display effect of the display substrate.

In order to solve the above problem, an embodiment of the present disclosure provides a display substrate including a plurality of sub-pixels. As shown in fig. 1, the plurality of sub-pixels may have a plurality of colors, for example, the plurality of sub-pixels may include a red sub-pixel R, a blue sub-pixel B, and a green sub-pixel G, which is not limited by the present disclosure.

As shown in fig. 1, the display substrate includes: a substrate base plate 10 (not shown in fig. 1), and a pixel defining layer disposed at one side of the substrate base plate 10, the pixel defining layer including a first bank 11, a second bank 12, and a third bank 13.

The first retaining wall 11 and the second retaining wall 12 are used to form opening regions O of sub-pixels, the first retaining wall 11 is located between the opening regions O of the sub-pixels that are different in color and adjacent to each other, and the second retaining wall 12 is located between the opening regions O of the sub-pixels that are the same in color and adjacent to each other.

FIG. 2 is a schematic cross-sectional view along AA' of the display substrate shown in FIG. 1. As shown in fig. 2, the third retaining wall 13 is disposed on a side of the first retaining wall 11 away from the substrate base plate 10, and an orthographic projection of the third retaining wall 13 on the substrate base plate 10 is located within an orthographic projection range of the first retaining wall 11 on the substrate base plate 10; the surface of the first retaining wall 11 on the side away from the substrate base plate is higher than the surface of the second retaining wall 12 on the side away from the substrate base plate 10 and lower than the surface of the third retaining wall 13 on the side away from the substrate base plate 10.

The display substrate provided by the present disclosure sets up third barricade 13 through the one side that deviates from substrate base plate 10 at first barricade 11 to the surface that first barricade 11 kept away from substrate base plate 10 one side is higher than the surface that first barricade 11 kept away from substrate base plate 10 one side for third barricade 13, and third barricade 13 blocks ink jointly with first barricade 11 and takes place the overflow cross color between the sub-pixel of different colours, avoids the ink of different colours to flow into in the adjacent opening region O, thereby reduces the colour mixture risk. Through set up third barricade 13 on first barricade 11, can suitably reduce the height of first barricade 11, reduce the climbing height of ink on first barricade 11 in the opening region O, improve the homogeneity and the flatness of rete in the opening region, improve display substrate's luminous quality, help improving display substrate's resolution ratio.

In addition, the surface of the first retaining wall 11 far away from the substrate base plate 10 is higher than the surface of the second retaining wall 12 far away from the substrate base plate 10, the higher first retaining wall 11 can prevent the overflow color mixing between the inks of the sub-pixels with different colors, the lower second retaining wall 12 can ensure that the inks are fully diffused among the sub-pixels with the same color, and the film layer uniformity inside the sub-pixels and among the sub-pixels is improved, so that the brightness uniformity is improved, and the display effect is improved.

In the present disclosure, the sub-pixels with different colors and adjacent sub-pixels are arranged along the row direction, and the sub-pixels with the same color and adjacent sub-pixels are arranged along the column direction, as shown in fig. 1.

Alternatively, in the row direction, the orthographic projection of the third retaining wall 13 on the substrate base plate 10 is located within the orthographic projection range of the first retaining wall 11 on the substrate base plate 10.

As shown in fig. 2, the orthographic projection of the first retaining wall 11 on the substrate base plate 10 covers the orthographic projection of the third retaining wall 13 on the substrate base plate 10. That is, as shown in fig. 1, in the line direction, the orthographic projection boundary of the third retaining wall 13 on the substrate base 10 is set back with respect to the orthographic projection boundary of the first retaining wall 11 on the substrate base 10. Accordingly, the thickness of the third retaining wall 13 in the row direction is smaller than the thickness of the first retaining wall 11 in the row direction.

Through setting up the orthographic projection boundary of third barricade 13 on substrate base plate 10 and for the orthographic projection boundary indentation of first barricade 11 on substrate base plate 10, can avoid the ink in the both sides opening region to climb on third barricade 13, avoid the climbing height of ink on first barricade 11 to receive the influence of third barricade 13, thereby can improve the uniformity of ink climbing height in each opening region O, improve the rete homogeneity of display substrate different positions, improve display substrate's luminance homogeneity.

In a specific implementation, the third partition walls 13 arranged along the column direction may be a continuous integral structure or may be a plurality of discrete structures (as shown in fig. 1). Through setting up the orthographic projection boundary of third barricade 13 on substrate base plate 10 and retracting in the line direction relative to the orthographic projection boundary of first barricade 11 on substrate base plate 10, no matter third barricade 13 is continuous structure or discrete structure, can both ensure the barricade highly uniform that ink contacted in each opening region O to ensure the climbing highly uniform of ink in each opening region O, avoid leading to the inhomogeneous problem of different positions filming because the barricade height is different, further improve the rete homogeneity of the different positions of display substrate.

Alternatively, as shown in fig. 1 and 2, in the row direction, the orthographic projection of the third retaining wall 13 on the substrate base plate 10 is located in the middle of the orthographic projection of the first retaining wall 11 on the substrate base plate 10.

That is, the third retaining wall 13 is provided centrally on the first retaining wall 11.

Alternatively, in the row direction, the distance (d 1 and d2 shown in fig. 1) between the orthographic projection boundary of the third retaining wall 13 on the substrate base plate 10 and the orthographic projection boundary of the first retaining wall 11 on the substrate base plate 10 is greater than or equal to 0.5 micrometer and less than or equal to 10 micrometers.

As shown in fig. 1, a distance d1 between an orthographic projection right side boundary of the third retaining wall 13 on the substrate base plate 10 and an orthographic projection right side boundary of the first retaining wall 11 on the substrate base plate 10 may be greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers. The distance d2 between the orthographic left side boundary of the third retaining wall 13 on the substrate base plate 10 and the orthographic left side boundary of the first retaining wall 11 on the substrate base plate 10 may be greater than or equal to 0.5 micrometer and less than or equal to 10 micrometers.

Further, the distance (e.g., d1 and d2 shown in fig. 1) between the orthographic projection boundary of the third retaining wall 13 on the substrate base plate 10 and the orthographic projection boundary of the first retaining wall 11 on the substrate base plate 10 may be greater than or equal to 3 micrometers, and less than or equal to 5 micrometers, for example, 4 micrometers, and the like, which is not limited by the disclosure.

FIG. 3 is a schematic cross-sectional view along BB' of the display substrate shown in FIG. 1.

As shown in fig. 3, the display substrate may further include an organic material layer 32 in the opening region O. The organic material layer 32 may be formed in the open region O using an inkjet printing process.

In the inkjet printing process, ink may be directly dropped into the opening region O, or ink may be dropped onto a surface of the second blocking wall 12 on a side away from the substrate base plate 10, the ink is diffused from the second blocking wall 12 to the opening regions O of the sub-pixels having the same color on both sides, and then the solvent in the ink is removed by a drying process, thereby forming the organic material layer 32 in the opening region O.

When dropping ink on the surface of the second blocking wall 12 on the side away from the substrate base plate 10, only the nozzles need to be arranged above the second blocking wall 12, and the nozzles do not need to be arranged above each opening region O, so that the number of nozzles in the inkjet printing device can be reduced, and the structure of the inkjet printing device is simplified.

When ink is dropped on a side surface of the second blocking wall 12 facing away from the substrate base plate 10, since the second blocking wall 12 has a certain thickness such that a height difference between the second blocking wall 12 and the first blocking wall 11 (e.g., Δ H1 in fig. 2) is small relative to a height difference between the first blocking wall 11 and the bottom of the opening area O (e.g., Δ H2 in fig. 3), the ink may be more seriously climbed at a position where the first blocking wall 11 contacts the second blocking wall 12, and the ink may overflow into the adjacent opening area O over the first blocking wall 11, resulting in color cross.

In order to solve the above problems, the present disclosure provides the following specific implementations of disposing the third retaining wall.

In the following first to third implementations, in the column direction, the orthographic projection of the third barrier wall 13 on the substrate base plate 10 (the range indicated by d6 in fig. 1, 4 and 5) overlaps with the orthographic projection of the second barrier wall 12 on the substrate base plate 10 (the range indicated by d4 in fig. 1, 4 and 5). In this case, ink may be dropped on a surface of the second blocking wall 12 on a side facing away from the substrate base plate 10. Due to the arrangement of the third retaining wall 13, the height difference of the contact position between the first retaining wall 11 and the second retaining wall 121 is increased, so that ink can be dropped on the surface of one side of the second retaining wall 121, which is away from the substrate base plate 10, the structure of the inkjet printing device can be simplified, ink of different colors can be effectively prevented from overflowing into the adjacent opening region O, and the risk of color mixing is reduced.

In the first implementation manner, in the column direction, the orthographic projection of the third barrier wall 13 on the substrate base plate 10 (the range indicated by d6 in fig. 4) is within the orthographic projection of the second barrier wall 12 on the substrate base plate 10 (the range indicated by d4 in fig. 4).

In this implementation, the width d6 of the third retaining wall 13 in the row direction is smaller than the width d4 of the second retaining wall 12 in the row direction. For example, when the width d4 of the second retaining wall 12 in the column direction is 50 micrometers, the width d6 of the third retaining wall 13 in the column direction may be greater than or equal to 10 micrometers and less than 50 micrometers.

In the present embodiment, in the column direction, an orthogonal projection of the third blocking wall 13 on the substrate base plate 10 (a range indicated by d6 in fig. 4) does not overlap with an orthogonal projection of the opening region O on the substrate base plate 10 (a range indicated by d7 in fig. 4), that is, the third blocking wall 13 is not provided at a position corresponding to the opening region O. Therefore, the climbing of ink in the opening area due to the position deviation of the third retaining wall 13 caused by factors such as unstable process and the like can be avoided, and the film uniformity in the opening area and between the opening areas can be ensured.

In the second implementation manner, in the column direction, the orthographic projection of the third barrier wall 13 on the substrate base plate 10 (the range indicated by d6 in fig. 5) covers the orthographic projection of the second barrier wall 12 on the substrate base plate 10 (the range indicated by d4 in fig. 5).

In this implementation, the width d6 of the third retaining wall 13 in the row direction is greater than the width d4 of the second retaining wall 12 in the row direction. For example, when the width d4 of the second retaining wall 12 in the column direction is 50 micrometers, the width d6 of the third retaining wall 13 in the column direction may be more than 50 micrometers.

In this implementation, because the width d6 of third barricade 13 in the row direction is great, when keeping off the ink droplet on second barricade 12 deviates from the lateral surface of substrate base plate 10, can shelter from the ink on the second barricade 12 more thoroughly, prevent more effectively that the ink of different colours overflows to adjacent opening region O in through the surface of first barricade 11 in, reduce the colour mixture risk.

In the third implementation, as shown in fig. 1, in the column direction, the orthographic projection of the third barrier wall 13 on the substrate base plate 10 (the range indicated by d6 in fig. 1) completely overlaps the orthographic projection of the second barrier wall 12 on the substrate base plate 10 (the range indicated by d4 in fig. 1).

As shown in fig. 1, the width d6 of the third wall 13 in the column direction is equal to the width d4 of the second wall 12 in the column direction. For example, when the width d4 of the second retaining wall 12 in the column direction is 50 micrometers, the width d6 of the third retaining wall 13 in the column direction is 50 micrometers.

In the present implementation manner, in the column direction, the orthographic projection (range indicated by d6 in fig. 1) of the third retaining wall 13 on the substrate base plate 10 does not overlap with the orthographic projection (range indicated by d7 in fig. 1) of the opening region O on the substrate base plate 10, that is, the third retaining wall 13 is not disposed at the position corresponding to the opening region O, so that it is possible to avoid the climbing of ink in the opening region O aggravated by the position deviation of the third retaining wall 13 due to process instability and other factors, and ensure the film uniformity in the opening region and between the opening regions. Meanwhile, when ink is dropped on the surface of one side of the second retaining wall 12 departing from the substrate base plate 10, the third retaining wall 13 can also effectively shield the ink on the second retaining wall 12, so that the ink with different colors is prevented from overflowing to the adjacent opening area through the surface of the first retaining wall 11, and the color mixing risk is reduced.

In the first to third implementations described above, the ink may be directly printed on the surface of the second barrier wall 12 on the side away from the substrate base plate 10.

In the fourth implementation, as shown in fig. 6, in the column direction, an orthogonal projection of the third partition wall 13 on the base substrate 10 (a range indicated by d6 in fig. 6) overlaps with an orthogonal projection of the opening region O on the base substrate 10 (a range indicated by d7 in fig. 6).

Alternatively, as shown in fig. 6, in the column direction, the orthographic projection of the third partition wall 13 on the base substrate 10 (the range indicated by d6 in fig. 6) covers the orthographic projection of the opening region O on the base substrate 10 (the range indicated by d7 in fig. 6).

FIG. 7 is a schematic cross-sectional view taken along line CC' of the display substrate shown in FIG. 6.

In this embodiment, ink can be dropped into the opening region O, and since the height difference between the first blocking wall 11 and the bottom of the opening region O (as shown in Δ H2 in fig. 7) is large, and the third blocking wall 13 is provided, the risk that ink overflows to an adjacent opening region through the first blocking wall 11 in the opening region can be effectively reduced, and the risk of color mixing can be reduced.

It should be noted that the arrangement manner of the third blocking wall 13 is not limited to the above-mentioned several implementation manners, and may be set according to actual requirements in practical applications.

In an alternative implementation manner, the third retaining walls 13 (131 and 132 shown in fig. 1 to 2 and 4 to 9) respectively located on the sides of the two adjacent first retaining walls facing away from the substrate are disposed in axial symmetry with respect to the symmetry axis x.

As shown in fig. 1, 4 to 6, 8 and 9, the extending direction of the symmetry axis x is a column direction, and the two first retaining walls 11 are adjacently arranged in a row direction.

That is, the third retaining wall 131 on the surface of one of the first retaining walls 11 facing away from the substrate base plate 10 is disposed opposite to the third retaining wall 132 on the surface of the adjacent first retaining wall 11 facing away from the substrate base plate 10, and is disposed in axial symmetry with respect to the axis of symmetry x.

Because the third retaining walls 13 located on the side of the two adjacent first retaining walls 11 departing from the substrate base plate 10 are symmetrically arranged on the two sides of the second retaining wall 12 or the opening region O, in the process of ink instillation, the oppositely arranged third retaining walls 13 can shield the ink on two sides, so that the ink is prevented from overflowing to the opening regions O adjacent to the two sides through the surfaces of the first retaining walls 11, and the color mixing risk is reduced.

When the third retaining walls 13 are symmetrically arranged on both sides of the second retaining wall 12, ink can be dripped on the surface of the second retaining wall 12 on the side away from the substrate base plate 10; when the third blocking walls 13 are symmetrically disposed at both sides of the opening region O, ink can be dropped into the opening region O. Like this, third barricade 13 can carry out two-sided sheltering from to the ink at the ink instillation in-process, reduces the colour mixture risk.

In an alternative implementation manner, in the column direction, the plurality of third retaining walls 13 may be disposed to be spaced apart from each other, and a distance between two adjacent third retaining walls 13 is greater than or equal to a size of an opening region of at least one sub-pixel.

Alternatively, the pitch of the adjacent two third blocking walls 13 in the column direction is smaller than or equal to the size of ten sub-pixels. Wherein the size of the sub-pixel is the sum of the sizes of one opening region and one second bank 12 in the column direction.

Further, in order to reduce the risk of overflow, the pitch of the adjacent two third blocking walls 13 in the column direction may be less than or equal to the size of five sub-pixels.

As shown in fig. 1, in the column direction, the pitch of two adjacent third blocking walls 13 is the size of the opening area of one sub-pixel.

As shown in fig. 4 and 5, in the column direction, the pitch of two adjacent third banks 13 is approximately the size of the opening area of one sub-pixel.

As shown in fig. 6, in the column direction, the distance between two adjacent third banks 13 is approximately the sum of the size of one sub-pixel opening region and the size of two second banks.

As shown in fig. 8, in the column direction, the pitch of two adjacent third banks 13 is the sum of the size of two sub-pixel opening regions and the size of one second bank.

As shown in fig. 9, in the column direction, the pitch of two adjacent third banks 13 is the sum of the size of the four sub-pixel opening regions and the size of the three second banks.

In a specific implementation, the distance between two adjacent third retaining walls 13 may be determined according to factors such as the printing overflow characteristic and the material characteristic of each retaining wall, which is not limited by the present disclosure.

Since the third blocking wall 13 is arranged to prevent overflow and climbing during printing ink, the ink printing position may correspond to the position of the third blocking wall 13, that is, an ink nozzle may be arranged at the position where the third blocking wall 13 is arranged, and ink may flow to other sub-pixels having the same color through the second blocking wall 12, so that the number of nozzles of the inkjet printing apparatus may be reduced.

It should be noted that the third retaining wall 13 on the side of the same first retaining wall 11 away from the substrate base plate 10 may also be an integral structure, which is not limited in the present disclosure.

In a specific implementation, the main materials of the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 may be the same. For example, the main materials of the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 are all photoresist. The photoresist may specifically be a positive photoresist or a negative photoresist, which is not limited by the present disclosure.

In order to better prevent the occurrence of overflow cross-color between the inks of different colors and prevent the ink in the opening region O from climbing too high on the first retaining wall 11, the first retaining wall 11 and the third retaining wall 13 may include a lyophobic material, and the second retaining wall 12 may not include the lyophobic material or include a small amount of the lyophobic material.

In an alternative implementation manner, the first retaining wall 11, the second retaining wall 12, and the third retaining wall 13 are made of a fluorine-containing photoresist, the fluorine content in the first retaining wall 11 is greater than the fluorine content in the second retaining wall 12, and the fluorine content in the third retaining wall 13 is greater than the fluorine content in the second retaining wall 12.

Illustratively, the main materials of the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 are all polyimide series materials or polymethyl methacrylate series materials and other photoresist materials. The first retaining wall 11 and the third retaining wall 13 may have lyophobic properties by doping or bonding fluorine-containing substances in the host material. The second retaining wall 12 can be made lyophilic with respect to the first retaining wall 11 and the third retaining wall 13 by doping or bonding a fluorine-containing substance in a small amount in the host material.

In an alternative implementation manner, the first retaining wall 11 and the third retaining wall 13 are made of fluorine-containing photoresist, and the second retaining wall 12 is made of fluorine-free photoresist.

Illustratively, the main materials of the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 are all photoresist materials such as polyimide series materials or polymethyl methacrylate series materials. The first retaining wall 11 and the third retaining wall 13 may have lyophobic properties by doping or bonding fluorine-containing substances in the host material. The doping or bonding of fluorine-containing substances is not performed in the main material of the second retaining wall 12, so that the second retaining wall 12 has lyophilic characteristics.

In this implementation manner, since the main material of the second retaining wall 12 is doped or bonded without fluorine, the second retaining wall 12 can be prevented from having lyophobic property after the post-baking process.

In an alternative implementation manner, as shown in fig. 2, fig. 3 and fig. 7, the first retaining wall 11 includes a first material layer 111 and a second material layer 112 that are stacked, and the second material layer 112 is located on a side of the first material layer 111 facing away from the substrate 10.

The first material layer 111 has lyophilic properties, and the second material layer 112 has lyophobic properties.

By disposing the first material layer 111 having lyophilic properties on the side close to the substrate 10, in the inkjet printing process, the bottom lyophilic material layer has strong attraction to ink, so that the ink can uniformly cover the entire opening region O, thereby improving the flatness of the film layer in the opening region O. Through setting up the second material layer 112 that has lyophobic property in the one side of keeping away from substrate base plate 10, the lyophobic material at top has the repulsion effect to the ink, can reduce the climbing height of ink effectively on the one hand, and on the other hand can avoid taking place the overflow and then cause the colour mixture between the sub-pixel of different colours.

In a specific implementation, fluorine-containing substances are doped or bonded in a host material such as a polyimide-based material or a polymethyl methacrylate-based material, and a coating process, a pre-baking process, an exposure process, a developing process, and the like are sequentially performed to make the top of the host material have lyophobic properties, so that the first material layer 111 and the second material layer 112 are formed.

In order to enable the ink between the adjacent two first blocking walls 11 to flow better between different sub-pixels, the second blocking wall 12 optionally has lyophilic properties. For example, the material of the second retaining wall 12 may be a fluorine-free photoresist, so that the second retaining wall 12 has lyophilic properties.

The second walls 12 have lyophilic properties, so that ink can smoothly flow between two adjacent first walls, and the uniformity of the film between pixels is improved.

In order to better prevent overflow cross-color between inks of different colors, the ink in the opening area O is prevented from climbing on the third partition walls 13, optionally at least a part of the third partition walls 13 have lyophobic property, or the third partition walls 13 comprise lyophobic material. For example, the material of the third retaining wall 13 may be fluorine-containing photoresist.

For example, as shown in fig. 2 and 7, the third retaining wall 13 may include a third material layer 21 and a fourth material layer 22, which are stacked, and the fourth material layer 22 is located on a side of the third material layer 21 facing away from the substrate base plate 10. Wherein the third material layer 21 has lyophilic properties and the fourth material layer 22 has lyophobic properties.

Since the third material layer 21 having lyophilic properties has a strong attraction to the ink overflowing to the surface of the first retaining wall 11, the ink can be prevented from continuing to overflow upward; the fourth material layer 22 with lyophobic property has a repelling effect on ink, so that ink overflow between sub-pixels with different colors can be avoided, and color mixing can be avoided.

In a specific implementation, fluorine-containing substances are doped or bonded in a main material such as a polyimide material or a polymethyl methacrylate material, and a coating process, a pre-baking process, an exposure process, a developing process and the like are sequentially adopted to make the top of the main material have lyophobic property, so that the third material layer 21 and the fourth material layer 22 are formed.

Alternatively, the entire surface of the third barrier wall 13 may have lyophobic property, so that the ink climbing and overflow color mixing may be more suppressed.

As shown in fig. 3 and 7, the display substrate may further include an organic material layer 32 disposed in the opening region O.

In the present disclosure, the organic material layer 32 is an organic film layer formed by an inkjet printing process. Therefore, the surface of the first retaining wall 11 on the side away from the substrate 10 is not provided with the organic material layer 32, and the surface of the second retaining wall 12 on the side away from the substrate 10 is provided with the organic material layer 32.

Optionally, a surface of the organic material layer 32 on a side away from the substrate 10 is higher than a surface of the second retaining wall 12 on a side away from the substrate 10 and lower than a surface of the first retaining wall 11 on a side away from the substrate 10.

Alternatively, as shown in fig. 3 and 7, a surface of the organic material layer 32 on a side facing away from the substrate base plate 10 is flush with or flush with a surface of the first material layer 111 on a side facing away from the substrate base plate 10.

Among other things, the organic material layer 32 may include one or more of the following film layers: the organic film layers are sequentially stacked, such as a hole injection layer, a hole transport layer, a light-emitting functional layer and the like.

Optionally, an auxiliary functional film 33 is further included in the opening region O, and the auxiliary functional film 33 may include one or more of the following films: an electron transport layer, an electron injection layer and a cathode layer are stacked on the side of the organic material layer 32 facing away from the substrate base plate 10. In particular implementations, one or more of the electron transport layer, the electron injection layer, and the cathode layer can be formed using an evaporation process. The orthographic projections of the electron transport layer, the electron injection layer and the cathode layer on the substrate base plate 10 may cover the entire surface of the substrate base plate 10.

In order to realize electroluminescence, as shown in fig. 3 and 7, the display substrate may further include an anode layer 31 on a side of the organic material layer 32 adjacent to the substrate 10.

Wherein the anode layer 31 is located between the substrate base plate 10 and the pixel defining layer. The anode layer 31 may include a plurality of anodes disposed in one-to-one correspondence with the open regions. The bottom of the opening region O may be a surface of the anode layer 31 on a side facing away from the substrate 10.

The light emitting function layer may include a plurality of light emitting layers in the respective opening regions O. In order to realize color light emission, the light emitting function layer may include a red light emitting layer, a green light emitting layer, and a blue light emitting layer. In this embodiment, the sub-pixels having the same color are provided with the light emitting layers having the same emission color in the opening regions O of the sub-pixels.

In the opening region O of each sub-pixel, the anode, the light-emitting layer, and the cathode layer form a laminated structure, thereby forming an electroluminescent diode.

Illustratively, the material of the light emitting layer may be an organic electroluminescent material, and accordingly, the electroluminescent diode is an organic light emitting diode. The material of the luminescent layer may also be quantum dots, and correspondingly, the electroluminescent diode is a quantum dot light emitting diode. The opening region of the pixel defining layer is a light emitting region of the sub-pixel where the electroluminescent diode is located.

In particular, the display substrate may further include a transistor array layer (not shown) disposed between the anode layer 31 and the substrate 10. The transistor array layer may include a plurality of pixel circuits, and the anode may be electrically connected to the pixel circuits to input a driving current to the anode through the pixel circuits and apply a corresponding voltage to the cathode, thereby driving the light emitting layer to emit light. Illustratively, the pixel circuit may include a storage capacitor and a transistor electrically connected to the storage capacitor. For example, the pixel circuit may be a 2T1C pixel circuit, a 3T1C pixel circuit, or a 7T1C pixel circuit, or the like. Wherein, the 2T1C pixel circuit comprises 2 transistors and 1 storage capacitor; the 3T1C pixel circuit includes 3 transistors and 1 storage capacitor; the 7T1C pixel circuit includes 7 transistors and 1 storage capacitor.

Alternatively, as shown in fig. 2, the height H1 of the first retaining wall 11 is greater than or equal to 0.5 micrometers and less than or equal to 2.0 micrometers in the direction perpendicular to the substrate base plate 10. Further, the height H1 of the first retaining wall 11 in the direction perpendicular to the substrate base plate 10 may be greater than or equal to 0.3 micrometers and less than or equal to 1.2 micrometers, which is not limited by the present disclosure.

Alternatively, as shown in fig. 2, the height of the second retaining wall 12 is greater than or equal to 0.3 micrometers and less than or equal to 2.0 micrometers in a direction perpendicular to the substrate base plate 10. Further, the height H2 of the second blocking wall 12 in the direction perpendicular to the substrate base plate 10 may be greater than or equal to 0.1 micrometer and less than or equal to 0.8 micrometer, which is not limited by the present disclosure.

Alternatively, as shown in fig. 2, in the direction perpendicular to the base substrate 10, the height H3 of the third retaining wall 13 is greater than or equal to 0.3 micrometers and less than or equal to 2.0 micrometers.

For example, for a 160ppi product, the height H1 of the first wall 11 in the direction perpendicular to the base substrate 10 is greater than or equal to 0.8 micrometers and less than or equal to 1.2 micrometers; the height H2 of the second retaining wall 12 is greater than or equal to 0.3 micrometer and less than or equal to 0.8 micrometer; the height H3 of the third retaining wall 13 is greater than or equal to 0.3 micrometers and less than or equal to 1.0 micrometer.

Alternatively, as shown in fig. 1, the thickness d3 of the first retaining wall 11 in the row direction is greater than or equal to 5 micrometers and less than or equal to 100 micrometers. Further, the thickness d3 of the first retaining wall 11 may be greater than or equal to 5 microns and less than or equal to 50 microns, which is not limited by the disclosure. For example, for a 160ppi product, the thickness d3 of the first wall 11 is greater than or equal to 10 microns and less than or equal to 20 microns.

Alternatively, the thickness d4 of second retaining wall 12 is greater than or equal to 5 micrometers and less than or equal to 100 micrometers in the column direction. Further, the thickness d4 of the second retaining wall is greater than or equal to 10 micrometers and less than or equal to 100 micrometers, which is not limited by the disclosure. For example, for a 160ppi product, the thickness d4 of the second wall is 50 microns.

In a specific implementation, the wall thickness d5 of the third wall 13 can be determined according to the wall thickness d3 of the first wall 11. For example, for a 160ppi product, the wall thickness d3 of first wall 11 is greater than or equal to 10 microns and less than or equal to 20 microns; the wall thickness d5 of the third partition wall 13 may be greater than or equal to 4 microns and less than or equal to 10 microns, which is not limited by the present disclosure.

Alternatively, the orthographic projection of the first retaining wall 11 on the substrate base plate 10 may be a straight line structure (as shown in fig. 1) with a certain width, and the like, which is not limited by the present disclosure.

Alternatively, the orthographic projection of the second retaining wall 12 on the substrate base plate 10 may be rectangular, etc., which is not limited by the present disclosure.

Alternatively, the shape of the orthographic projection of the third blocking wall 13 on the substrate base plate 10 may include at least one of: rectangular (as shown in a in fig. 10), square, diamond (as shown in d in fig. 10), trapezoid, parallelogram, ellipse (as shown in b in fig. 10), and circle. As shown in c of fig. 10, the shape of the orthographic projection of the third retaining wall 13 on the substrate base plate 10 includes two identical trapezoids with their short sides connected.

Alternatively, the orthographic projection shape of the opening region of the sub-pixel on the substrate base plate 10 may be a rectangle (as shown in fig. 1), and may also be other polygons, chamfered polygons, ellipses, racetrack shapes, waist circles, gourd shapes, and the like, which is not limited by the present disclosure.

In addition, the sizes of different positions of the opening region in the row direction can be the same size, and also can be different sizes, for example, in the same opening region, the size of the first position in the row direction can be larger than the size of the second position in the row direction, so that in the process of printing ink, the ink can be dripped at the first position in the opening region, the requirement on dripping accuracy can be reduced, and the process difficulty is reduced.

It should be noted that the "contact angle" refers to the angle between the solid-liquid boundary lines, and is a measure of the degree of wetting. If the contact angle of the solid material and the liquid is larger than the first critical angle, the solid material is a lyophobic material, and the larger the contact angle of the solid material and the liquid is, the better the lyophobic performance is. If the contact angle of the solid material and the liquid is smaller than the second critical angle, the solid material is a lyophilic material, and the smaller the contact angle of the solid and the liquid is, the better the lyophilic performance is.

For example, if the contact angle between the solid material and the ink is greater than 35 ° of the first critical angle, it may indicate that the solid material is a lyophobic material. If the contact angle between the solid material and the ink is less than 5 ° from the second critical angle, it can be said that the solid material is lyophilic.

In an actual process, the same features may not be completely the same due to limitations of process conditions or other factors, and some variations may occur, so that the same relationship between the features is only required to substantially satisfy the above conditions, and thus the protection scope of the present disclosure is included. For example, the above-described identity may be the same as allowed within an error allowable range.

The present disclosure also provides a display device including the display substrate provided in any one of the embodiments.

Those skilled in the art will appreciate that the display device has the advantages of the front display substrate.

The display device in this embodiment may be: any product or component with a 2D or 3D display function, such as a display panel, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.

The disclosure also provides a method for manufacturing a display substrate, wherein the display substrate comprises a plurality of sub-pixels. The preparation method comprises the following steps:

step S01: a base substrate is provided.

Step S02: a pixel defining layer is formed on one side of the substrate base, wherein the pixel defining layer includes a first barrier wall 11, a second barrier wall 12, and a third barrier wall 13, as shown in fig. 1.

As shown in fig. 2, the third retaining wall 13 is disposed on a side of the first retaining wall 11 away from the substrate base plate 10, and an orthographic projection of the third retaining wall 13 on the substrate base plate 10 is located within an orthographic projection range of the first retaining wall 11 on the substrate base plate 10; the surface of the first retaining wall 11 on the side away from the substrate base plate is higher than the surface of the second retaining wall 12 on the side away from the substrate base plate 10 and lower than the surface of the third retaining wall 13 on the side away from the substrate base plate 10.

The display substrate provided in any of the above embodiments can be prepared by the preparation method provided in this embodiment.

In a first alternative implementation, step S02 may include: a first retaining wall 11, a second retaining wall 12 and a third retaining wall 13 are formed simultaneously on one side of the substrate base plate 10 by adopting a one-step composition process.

Specifically, the first barrier wall 11, the second barrier wall 12, and the third barrier wall 13 may be formed simultaneously by a single exposure and development process, so that the process of manufacturing the pixel defining layer may be simplified.

In this implementation, the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 may be made of the same main material.

In a second alternative implementation, step S02 may include: a first-time composition process is adopted, a first retaining wall 11 and a second retaining wall 12 are synchronously formed on one side of the substrate base plate 10, and a second-time composition process is adopted, and a third retaining wall 13 is formed on one side, deviating from the substrate base plate 10, of the first retaining wall 11.

Specifically, a first exposure process may be used to form the structure of the first retaining wall 11 at both the position of the first retaining wall 11 and the position of the second retaining wall 12, for example, a structure with a lyophilic material at the bottom and a lyophobic material at the top, and then a first development process is used to remove the lyophobic material at the top of the position of the second retaining wall 12 to form the second retaining wall 12 and the first retaining wall 11; thereafter, a second exposure and development process may be used to form a third retaining wall 13 on a side of the first retaining wall 11 away from the substrate base plate 10.

In this implementation, since the third retaining wall 13 is formed by a single patterning process, a material different from the first retaining wall and the second retaining wall may be used. The first retaining wall and the second retaining wall can be made of the same main body material.

It should be noted that the main material of the third retaining wall 13 may also be the same as the first retaining wall and the second retaining wall, and the disclosure is not limited thereto.

In a third alternative implementation, step S02 may include: and respectively adopting three times of composition processes to sequentially form a second retaining wall 12, a first retaining wall 11 and a third retaining wall 13 on one side of the substrate base plate 10. The following examples are described in detail.

In this implementation, since the first blocking wall 11, the second blocking wall 12, and the third blocking wall 13 are formed by using separate patterning processes, different host materials may be used. It should be noted that the main materials of the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 may also be the same, and the disclosure is not limited thereto.

In a specific implementation, after step S02, the following steps may be further included: an organic material layer is formed in the opening region O using an inkjet printing process.

As shown in fig. 1, 4 and 5, in the arrangement direction of the same color and adjacent sub-pixels, the orthographic projection of the third barrier wall 13 on the substrate base plate 10 (the range indicated by d6 in fig. 1, 4 and 5) overlaps with the orthographic projection of the second barrier wall 12 on the substrate base plate 10 (the range indicated by d4 in fig. 1, 4 and 5), and the orthographic projection of the position on the substrate base plate 10 where the ink droplet is dropped in the inkjet printing process can be located within the orthographic projection range of the second barrier wall 12 on the substrate base plate 10.

When ink is dropped on the surface of one side of the second retaining wall 12, which is far away from the substrate base plate 10, the ink is diffused from the second retaining wall 12 to the opening regions O of the subpixels with the same color on the two sides, so that only nozzles need to be arranged above the second retaining wall 12, and nozzles do not need to be arranged above each opening region O, thereby reducing the number of nozzles in the inkjet printing device and simplifying the structure of the inkjet printing device.

In addition, due to the arrangement of the third retaining wall 13, the height difference of the contact position of the first retaining wall 11 and the second retaining wall 12 is increased, so that ink is dropped on the surface of one side of the second retaining wall 12, which is away from the substrate base plate 10, and the ink with different colors can be effectively prevented from overflowing to the adjacent opening region O through the surface of the first retaining wall 11, so that the color mixing risk is reduced.

It should be noted that, when the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 are made of the same main material, no matter the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13 are formed simultaneously by a single-step composition process or formed step by a multiple-step composition process, no distinct boundary as shown in fig. 2 exists among the first retaining wall 11, the second retaining wall 12 and the third retaining wall 13, and a gradient region (not shown) in slow transition exists among the three.

Next, a method for manufacturing the display substrate shown in fig. 1 will be described in detail with reference to fig. 11 to 16 by using specific examples.

The preparation method of the display substrate provided by the embodiment of the disclosure can comprise the following steps:

(1) a base substrate 10 is provided, and a transistor array layer (not shown) and an anode layer 31 are sequentially formed on one side of the base substrate 10, as shown in fig. 11. Wherein, the transistor array layer can be formed by a method combining dry etching and wet etching.

If the display substrate is a bottom emission device structure, the anode layer 31 may be made of Indium Tin Oxide (ITO), for example; if the display substrate is a top-emitting device structure, the anode layer 31 may be made of ITO/Ag/ITO, for example. The anode layer 31 may be formed by a sputtering process, a paste process, exposure, and development.

(2) Forming a second bank 12 on the substrate 10 on which the anode layer 31 is formed by a first patterning process; as shown in fig. 12.

(3) Forming a first retaining wall 11 on the substrate base plate 10 on which the second retaining wall 12 is formed by adopting a second composition process; as shown in fig. 13.

The second walls 12 have a second height H2 in the direction perpendicular to the plane of the substrate 10, the first walls 11 have a first height H1 in the direction perpendicular to the plane of the substrate 10, and the first height H1 is greater than the second height H2. The first retaining wall 11 and the second retaining wall 12 together define a plurality of open regions O.

(4) Forming a third retaining wall 13 on the first retaining wall 11 by adopting a third composition process; as shown in fig. 14.

(5) Printing the material solution of the organic material layer 32 into each opening region O by using an inkjet printing process, then forming a film by vacuum drying, and baking to remove the solvent in the ink, thereby forming the organic material layer 32; as shown in fig. 15. The organic material layer 32 includes a hole injection layer, a hole transport layer, and a light emitting layer, and the hole injection layer is disposed adjacent to the anode layer 31.

(6) Sequentially evaporating and plating an electron transport layer, an electron injection layer and a cathode layer on one side of the organic material layer 32, which is far away from the substrate base plate 10, so as to obtain an auxiliary functional film layer 33; as shown in fig. 16. The auxiliary functional film layer 33 may be a whole-surface structure covering the substrate 10.

The preparation method provided by the disclosure is simple to operate and easy for mass production.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Finally, it should also be noted that, unless otherwise defined, the terms "first," "second," and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The display substrate and the display device provided by the present disclosure are described in detail above, and the principles and embodiments of the present disclosure are explained herein by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present disclosure; meanwhile, for a person skilled in the art, based on the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present disclosure should not be construed as a limitation to the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Reference herein to "one embodiment," "an embodiment," or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Moreover, it is noted that instances of the word "in one embodiment" are not necessarily all referring to the same embodiment.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A display substrate comprising a plurality of sub-pixels, the display substrate comprising:

2. The display substrate according to claim 1, wherein the sub-pixels with different colors and adjacent to each other are arranged along a row direction, and the sub-pixels with the same color and adjacent to each other are arranged along a column direction;

3. The display substrate according to claim 2, wherein an orthographic projection of the third retaining wall on the substrate base plate is located in the middle of an orthographic projection of the first retaining wall on the substrate base plate in the row direction.

4. The display substrate according to claim 2, wherein in the column direction, an orthographic projection of the third retaining wall on the substrate is within an orthographic projection range of the second retaining wall on the substrate; alternatively, the first and second electrodes may be,

in the column direction, the orthographic projection of the third retaining wall on the substrate is covered by the orthographic projection of the second retaining wall on the substrate.

5. The display substrate according to claim 2, wherein an orthographic projection of the third bank on the substrate in the column direction covers an orthographic projection of the opening region on the substrate.

6. The display substrate according to claim 2, wherein third retaining walls respectively located on two adjacent first retaining walls on the side away from the substrate are arranged in axial symmetry with respect to a symmetry axis; the extending direction of the symmetry axis is the column direction, and the two first retaining walls are adjacently arranged in the row direction.

7. The display substrate according to claim 2, wherein the third walls are spaced apart from each other in the column direction, and a distance between two adjacent third walls is greater than or equal to a size of an opening region of at least one sub-pixel.

8. The display substrate according to claim 7, wherein in the column direction, a pitch between two adjacent third retaining walls is less than or equal to a size of ten sub-pixels.

9. The display substrate according to any one of claims 2 to 8, wherein, in the row direction, a distance between an orthographic projection boundary of the third retaining wall on the substrate and an orthographic projection boundary of the first retaining wall on the substrate is greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers.

10. The display substrate according to any one of claims 1 to 8, wherein the first retaining wall, the second retaining wall and the third retaining wall are made of a fluorine-containing photoresist, the fluorine content in the first retaining wall is greater than the fluorine content in the second retaining wall, and the fluorine content in the third retaining wall is greater than the fluorine content in the second retaining wall; alternatively, the first and second electrodes may be,

the first retaining wall and the third retaining wall are made of fluorine-containing photoresist, and the second retaining wall is made of fluorine-free photoresist.

11. The display substrate according to any one of claims 1 to 8, wherein the first retaining wall includes a first material layer and a second material layer stacked on each other, the second material layer being located on a side of the first material layer facing away from the substrate; wherein the first material layer has lyophilic properties and the second material layer has lyophobic properties.

12. The display substrate of any one of claims 1 to 8, wherein the second barrier has lyophilic properties.

13. The display substrate of any one of claims 1 to 8, wherein at least a portion of the third retaining walls have lyophobic properties.

14. The display substrate according to any one of claims 1 to 8, wherein the display substrate further comprises an organic material layer disposed in the opening region;

the surface of one side, deviating from the substrate base plate, of the organic material layer is higher than the surface of one side, far away from the substrate base plate, of the second retaining wall and is lower than the surface of one side, far away from the substrate base plate, of the first retaining wall.

15. The display substrate according to any one of claims 1 to 8, wherein the height of the first retaining wall is greater than or equal to 0.5 micrometers and less than or equal to 2.0 micrometers in a direction perpendicular to the substrate; and/or the presence of a gas in the gas,

in the direction vertical to the substrate base plate, the height of the second retaining wall is more than or equal to 0.3 micrometer and less than or equal to 2.0 micrometer; and/or the presence of a gas in the atmosphere,

16. The display substrate according to any one of claims 2 to 8, wherein the thickness of the first retaining wall in the row direction is greater than or equal to 5 micrometers and less than or equal to 100 micrometers; and/or the presence of a gas in the gas,

17. The display substrate of any one of claims 1 to 8, wherein an orthographic shape of the third retaining wall on the substrate comprises at least one of: triangular, rectangular, square, diamond, trapezoidal, parallelogram, oval, and circular.

18. A display device comprising the display substrate of any one of claims 1 to 17.