CN113270461B

CN113270461B - Display substrate, manufacturing method thereof and display device

Info

Publication number: CN113270461B
Application number: CN202110545057.XA
Authority: CN
Inventors: 代青
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2022-11-25
Anticipated expiration: 2041-05-19
Also published as: CN113270461A

Abstract

Provided are a display substrate, a manufacturing method thereof and a display device. The display substrate comprises a substrate, a pixel defining layer and a plurality of sub-pixels, wherein the pixel defining layer and the sub-pixels are positioned on one side of the substrate, at least some of the sub-pixels are provided with pixel openings, the sub-pixels are provided with a plurality of colors, and the pixel openings are provided with long sides La and short sides Lb; the long edge La of the pixel opening of two adjacent sub-pixels with different colors has an included angle theta, and the included angle theta is larger than 0 degree and smaller than 180 degrees; the pixel definition layer comprises a first pixel definition sub-layer positioned between the pixel openings of the sub-pixels with different colors and a second pixel definition sub-layer positioned between the pixel openings of the adjacent sub-pixels with the same color; the thickness of the second pixel defining sub-layer is less than the thickness of the first pixel defining sub-layer.

Description

Display substrate, manufacturing method thereof and display device

Technical Field

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

Background

The display substrate of the electroluminescent device and the like are prepared by a solution process method to prepare a film of the luminescent layer. In the preparation process, ink (a mixture containing a solute and a solvent) needs to be dried to form a required thin film, and in the drying process of the ink, due to the fact that the shapes or the sizes of pixel openings of the light-emitting layers are different, the thicknesses of the thin films of the light-emitting layers formed in different pixel openings are not uniform, and the service life and the display effect of the display substrate are greatly influenced. In addition, the pixel opening material of the display substrate further causes uneven film thickness at different positions in the pixel opening during the drying process of the ink, which causes uneven brightness at different positions of the display substrate and greatly reduces the utilization rate of the material. Therefore, in the production of an electroluminescent device, how to make a display substrate of the electroluminescent device keep the thickness of a thin film in a pixel opening uniform in the process of forming a light emitting layer is an important issue to be paid attention by developers.

The above information disclosed in this section is only for the understanding of the background of the technical idea of the present disclosure, and thus, the above information may contain information that does not constitute prior art.

Disclosure of Invention

In one aspect, a display substrate is provided, including a substrate, and a pixel defining layer and a plurality of sub-pixels on one side of the substrate, at least some of the sub-pixels having pixel openings, wherein the plurality of sub-pixels have a plurality of colors, and the pixel openings have a long side La and a short side Lb; the long edge La of the pixel opening of two adjacent sub-pixels with different colors has an included angle theta, and the included angle theta is larger than 0 degree and smaller than 180 degrees; the pixel defining layer comprises a first pixel defining sub-layer positioned between the pixel openings of the sub-pixels with different colors and a second pixel defining sub-layer positioned between the pixel openings of the adjacent sub-pixels with the same color; the second pixel defining sub-layer has a thickness less than a thickness of the first pixel defining sub-layer.

According to some exemplary embodiments, the orthographic projections of the pixel openings of two adjacent sub-pixels of the same color on the long side La have an overlapping region, and the orthographic projections of the second pixel defining sub-layers on the long side La of the pixel opening are located in the overlapping region.

According to some exemplary embodiments, the first pixel defining sub-layer has a thickness greater than 1 micron.

According to some exemplary embodiments, the second pixel defining sub-layer has a thickness in a range of 0.1 to 1 micron.

According to some exemplary embodiments, the length L1 of the second pixel defining sublayer is 0.2 to 0.5 times the long side La of the pixel opening, and the width L2 of the second pixel defining sublayer is 0.2 to 0.5 times the short side Lb of the pixel opening.

According to some exemplary embodiments, the relationship between the width L2 of the second pixel defining sublayer and the long side La and the short side Lb of the pixel opening is: l2= La-2Lb.

According to some exemplary embodiments, the first pixel defining sub-layer comprises a lyophilic material layer and a lyophobic material layer, the lyophobic material layer being disposed on a side of the lyophilic material layer remote from the substrate.

According to some exemplary embodiments, the second pixel defining sub-layer includes a lyophilic material layer.

According to some exemplary embodiments, the included angle θ is in a range of 45 degrees to 135 degrees.

According to some exemplary embodiments, the plurality of sub-pixels includes a first direction sub-pixel extending along a first direction and a second direction sub-pixel extending along a second direction, wherein the first direction and the second direction intersect with each other at an angle θ.

According to some exemplary embodiments, the plurality of sub-pixels includes a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel; the first color sub-pixel, the second color sub-pixel and the third color sub-pixel comprise a first direction sub-pixel and a second direction sub-pixel; the first direction sub-pixels and the second direction sub-pixels are alternately arranged in a third direction; in the third direction, the first color sub-pixel and the third color sub-pixel are respectively arranged on two sides of the second color sub-pixel.

According to some exemplary embodiments, projections of long sides of the first and second direction sub-pixels in a direction perpendicular to the third direction overlap, and projections of short sides of the first and second direction sub-pixels in a direction perpendicular to the third direction overlap.

In another aspect, the present disclosure also provides a display device, wherein the display device includes the display substrate as described above.

In another aspect, the present disclosure also provides a method of manufacturing a display substrate, including: forming a substrate base plate; forming a pixel defining layer and a plurality of sub-pixels on the substrate, at least some of the sub-pixels having a pixel opening, the pixel defining layer surrounding the pixel opening, wherein the plurality of sub-pixels have a plurality of colors, the pixel opening having a long side La and a short side Lb; the long sides La of the pixel openings of two adjacent sub-pixels with different colors have an included angle theta; the pixel defining layer comprises a first pixel defining sub-layer located between the pixel openings of the sub-pixels with different colors and a second pixel defining sub-layer located between the pixel openings of the adjacent sub-pixels with the same color; the second pixel defining sublayer has a thickness less than a thickness of the first pixel defining sublayer.

According to some exemplary embodiments, the forming of the pixel defining layer on the substrate base plate includes: forming a lyophilic material layer on a substrate base plate; and forming a lyophobic material layer on one side of the lyophilic material layer, which is far away from the substrate base plate.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below, and it should be understood that the drawings described below relate only to some embodiments of the present disclosure, and not to limit the present disclosure, wherein:

fig. 1 is a schematic plan view of a display substrate according to an exemplary embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional structure of a display substrate according to an exemplary embodiment of the present disclosure, taken along line AA' in fig. 1;

fig. 3 is a schematic cross-sectional structure view of a display substrate according to an exemplary embodiment of the present disclosure, taken along line BB' in fig. 1;

FIG. 4 is a partial enlarged view of a display substrate according to an exemplary embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a display device according to an exemplary embodiment of the present disclosure; and

fig. 6 is a flowchart of a method of manufacturing a display substrate according to an exemplary embodiment of the present disclosure.

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 clearly and completely described below with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of the disclosure.

It should be noted that in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. As such, the sizes and relative sizes of the respective elements are not necessarily limited to those shown in the drawings. In the description and drawings, the same or similar reference numerals denote the same or similar parts.

When an element is referred to as being "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. Other terms and/or expressions used to describe the relationship between elements should be interpreted in a similar manner, e.g., "between 8230; \8230between the pairs" directly between 8230; \8230, between the pairs "directly adjacent" or "between the 8230, the pairs" directly on 8230, the pairs "\8230, the upper" and the like. Further, the term "connected" may refer to physical, electrical, communication, and/or fluid connections. Further, the X, Y, and Z axes are not limited to the three axes of the rectangular coordinate system, and may be interpreted in a broader sense. For example, the X, Y, and Z axes may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be construed as X only, Y only, Z only, or any combination of two or more of X, Y, and Z such as XYZ, XYY, YZ, and ZZ. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, although the terms "first", "second", etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one element, component, element, region, layer or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below could be termed a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present disclosure.

For purposes of description, spatial relational terms, such as "upper," "lower," "left," "right," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features.

It will be understood by those skilled in the art that, in this context, unless otherwise specified, the expression "thickness" refers to the dimension along the surface perpendicular to the display substrate on which the respective film layers are provided, i.e. the dimension along the light exit direction of the display substrate.

In this context, the term "climbing effect" refers to the position where the solution contacts with the solid, and due to the characteristics of the solution itself and the influence of factors such as surface tension, the liquid level in the solution near the solid contact area is higher than the liquid level far away from the solid-liquid contact position of the solution, i.e. the liquid level of the same liquid shows non-uniformity.

In the related art, the size of the pixel opening in the light emitting region of the display substrate has a large influence on the film thickness of the light emitting region. The pixel opening generally has a long side (parallel to the long side direction of the pixel) and a short side (parallel to the short side direction of the pixel), and the thin film in the pixel opening corresponds to an actual long side width and an actual short side width in the process of solidifying and forming into the light-emitting layer, and theoretically, the thickness of the thin film in the light-emitting region should be equal. However, due to the influence of factors such as the current process, the size of the pixel opening, the material for forming the thin film, and the like, a climbing effect is exhibited at the edge of the pixel opening when the thin film is formed, that is, the thickness of the thin film formed in the long side and the short side directions of the pixel opening is not uniform, which further causes the non-uniformity of the flatness. For example, the actual thickness of the long side width is uniform and the flatness is good, and the actual thickness of the short side width is not uniform and the flatness is poor. In addition, when the display substrate has a plurality of pixels of different colors, and the light-emitting layers are formed in the pixel openings, the light-emitting layers of the same color and different colors are formed with different thicknesses due to the separation of the pixel openings, which eventually causes the brightness and color of the light-emitting region to be non-uniform.

In order to effectively solve the above problems occurring in the manufacturing process of the display substrate, embodiments of the present disclosure provide a display substrate, which can effectively solve the phenomenon that the thickness of the long side and the short side is not uniform due to the inconsistency of the long side and the short side of the pixel opening in the forming process of the light emitting layer material in the pixel opening. Meanwhile, the communicated channels are arranged among the pixel openings of the sub-pixels with the same color, so that the thickness uniformity of the light-emitting layer material with the same color can be ensured.

Fig. 1 is a schematic plan structure view of a display substrate according to an exemplary embodiment of the present disclosure.

As shown in fig. 1, the display substrate 10 includes a substrate 100, a plurality of sub-pixels 110, and a pixel defining layer 120. The sub-pixels 110 have a plurality of colors, such as a red sub-pixel 111, a blue sub-pixel 112, and a green sub-pixel 113. At least some of the sub-pixels 110 have a pixel opening O, for example, a rectangular frame where the red sub-pixel 111, the blue sub-pixel 112, and the green sub-pixel 113 are located is the pixel opening O, the pixel defining layer 120 surrounds the pixel opening O, and the pixel opening O has a long side La and a short side Lb.

In other embodiments of the present disclosure, the pixel opening O is configured as a rectangle, and in other alternative embodiments, the pixel opening O may be configured as a parallelogram, or other suitable shape, and has a long side and a short side inside the pixel opening O.

In the exemplary embodiment of the present disclosure, the long sides La of the pixel openings O of the adjacent two sub-pixels of different colors have an included angle θ. Since the sizes of the long sides and the short sides of the actual sub-pixels of different colors may not be the same, by setting the angle θ between the long sides of the pixel apertures of two adjacent sub-pixels of different colors, the sub-pixels of a plurality of colors can be configured into one pixel unit to display different colors. Through setting up contained angle theta, its accuracy that can effectively improve the colour that a pixel cell shows can further adjust the display effect of display substrate through the value of adjusting contained angle theta in actual manufacturing process, for example prevent that display substrate from appearing defects such as colour cast.

Fig. 2 is a schematic cross-sectional structure of a display substrate according to an exemplary embodiment of the present disclosure, taken along line AA' in fig. 1. Fig. 3 is a schematic cross-sectional structure of a display substrate according to an exemplary embodiment of the present disclosure, taken along the line BB' in fig. 1.

As shown in fig. 1, the pixel defining layer 120 includes a first pixel defining sub-layer 121 located between the pixel openings O of the sub-pixels with different colors, and a second pixel defining sub-layer 122 located between the pixel openings O of the adjacent sub-pixels with the same color. The thickness of the second pixel defining sublayer 122 is less than the thickness of the first pixel defining sublayer 121 (as shown in fig. 2).

In an embodiment of the present disclosure, the first pixel defining sublayer 121 serves to separate a plurality of sub-pixels to surround and form the pixel opening O. The light emitting layer material is inkjet-printed in the pixel opening O by an inkjet printing process, and the light emitting layer material is solidified and accommodated in the pixel opening O, and when the light emitting layer material is formed, the light emitting layer materials of different colors may be spaced apart by the first pixel defining sub-layer 121.

The second pixel defining sub-layer 122 is located between the pixel openings O of the adjacent same-color sub-pixels, and since the thickness of the second pixel defining sub-layer 122 is smaller than that of the first pixel defining sub-layer 121, the light emitting layer material in the pixel openings O of the same-color sub-pixels can flow in the forming process, that is, the light emitting layer material can diffuse in the pixel openings of the same-color sub-pixels in the forming process, even when ink jet printing is performed, the thickness of the light emitting layer material in each pixel opening is not uniform, and the uniform thickness can be finally maintained in a diffusing manner. Therefore, the film forming uniformity of the luminescent layer material can be improved, and the display effect of the display substrate is further improved.

In the embodiment of the present disclosure, the orthographic projections of the pixel openings O of the two adjacent sub-pixels of the same color on the long side La have an overlapping region, and the orthographic projections of the second pixel defining sub-layer 122 on the long side La of the pixel opening O are located in the overlapping region. For example, a portion is located within the overlap region. Or the orthographic projection of the second pixel defining sublayer on the long side La of the pixel opening coincides with the overlapping area.

Specifically, the adjacent sub-pixels of the same color are arranged in parallel, and as shown in fig. 1, in the direction of the long side La of the pixel aperture, the orthographic projection of the adjacent two sub-pixels of the same color in the direction perpendicular to La has an overlapping region between the long sides La of the adjacent pixel apertures. The second pixel defining sublayer 122 is disposed within the overlapping region, and an orthographic projection of the second pixel defining sublayer 122 on the long side La of the pixel opening O is located within the overlapping region. In other embodiments, the orthographic projection of the second pixel defining sublayer over the long side La of the pixel opening coincides with the overlap region, i.e., the second pixel defining sublayer 122 has two opposite ends, one of which is in contact with the short side of one of the pixel openings and the other of which is in contact with the short side of another adjacent pixel opening. In the process of forming the light emitting layer material, the light emitting layer material in one of the pixel openings may diffuse into another pixel opening adjacent to the pixel opening through the position where the second pixel defining sub-layer 122 is located. That is, as shown in fig. 2, the light-emitting layer material M completely covers the second pixel defining sub-layer 122 during the formation process, so that the light-emitting layer material along the short side Lb of the pixel opening communicates in the overlapping region, and the liquid level width of the light-emitting layer material M during the formation process is larger than the width of the short side Lb of the pixel opening, which indirectly increases the liquid level width of the light-emitting layer material M at the short side Lb of the pixel opening. According to the embodiment of the present disclosure, by disposing the second pixel defining sub-layer 122 and locating the second pixel defining sub-layer 122 in the overlapping region, the climbing effect caused by the small size of the short side Lb of the pixel opening can be effectively alleviated, and the film formation uniformity of the light emitting layer material can be improved.

In an embodiment of the present disclosure, the thickness of the first pixel defining sublayer 121 is greater than 1 micrometer, and the thickness of the second pixel defining sublayer 122 is in a range of 0.1 micrometer to 1 micrometer. The thickness of the second pixel definition sublayer 122 is set in the range from 0.1 micrometer to 1 micrometer, and is smaller than the thickness of the first pixel definition sublayer 121, so that on one hand, the light-emitting layer materials in the pixel openings with the same color can flow mutually in the process of forming a thin film, and the uniformity of the formed film is improved, on the other hand, the thickness of the first pixel definition sublayer 121 is set to be larger than 1 micrometer, so that the light-emitting layer materials can meet the thickness requirement when forming the thin film, good light-emitting efficiency is ensured, and the display effect of the display substrate is improved.

For example, the thickness of the second pixel defining sub-layer 122 is in a range from 0.3 micrometers to 0.5 micrometers, and the film formation of the light emitting layer material is more uniform, so that the display effect is better.

Fig. 4 is a partially enlarged view of a display substrate according to an exemplary embodiment of the present disclosure.

As shown in fig. 4, the second pixel defining sublayer 122 has a length L1 and a width L2. The length L1 of the second pixel-defining sublayer 122 is 0.2 to 0.5 times the long side La of the pixel opening, and the width L2 of the second pixel-defining sublayer 122 is 0.2 to 0.5 times the short side Lb of the pixel opening.

In the embodiment of the present disclosure, the relationship between the width L2 of the second pixel defining sublayer and the long side La and the short side Lb of the pixel opening is: l2= La-2Lb.

In the embodiment of the present disclosure, the second pixel defining sub-layer 122 is disposed between the pixel openings of the adjacent same-color sub-pixels. By setting the length L1 and the width L2 of the second pixel definition sublayer within the range of the aforementioned multiples of the long side La and the short side Lb of the pixel opening, respectively, the second pixel definition sublayer can be adjusted and set according to the size of the pixel opening to meet the requirements of pixel openings of different sizes, and can also be adjusted according to the requirements of the PPI of the display substrate. In addition, the climbing effect in the film forming process of the light-emitting layer material in the short side direction of the pixel opening can be inhibited, and the film forming uniformity is improved.

In an embodiment of the present disclosure, as shown in fig. 2 and 3, the first pixel defining sub-layer 121 includes a lyophilic material layer 1211 and a lyophobic material layer 1212, the lyophilic material layer 1211 is disposed on the substrate 100, and the lyophobic material layer 1212 is disposed on a side of the lyophilic material layer 1211 away from the substrate 100.

For example, the first pixel defining sub-layer 121, by disposing the lyophilic material layer 1211 on a side close to the substrate 100, when the light emitting layer material M is formed by performing inkjet printing on the pixel opening O, due to the presence of the lyophilic material layer, a climbing effect is exhibited at an edge of the pixel opening O, and the climbing effect tends to be severe in a direction of a short side Lb of the pixel opening O, resulting in a poor display effect. By disposing the lyophobic material layer 1212 on the side of the lyophilic material layer 1211 away from the substrate 100, the climbing effect of the light emitting layer material can be effectively suppressed, and color mixing caused by overflow of ink among pixels with different colors can be avoided. Moreover, as described above, by providing the second pixel defining sub-layer 122, the width of the light emitting layer material on the short side of the pixel opening O can be indirectly increased, and the climbing effect of the pixel opening O on the short side Lb can be further alleviated.

In the embodiment of the present disclosure, the width of the first pixel defining sublayer 121 between the sub-pixels of different colors is Lc, as shown in fig. 4. The larger the width Lc is, the more the printing device can effectively prevent overflow, but the opening ratio is reduced in the case where the PPI is fixed, and therefore, the width Lc of the first pixel defining sub-layer 121 is set to the minimum value in the case where the process does not overflow, which is advantageous for increasing the opening ratio.

Specifically, the width of the first pixel defining sublayer 121 refers to the spacing Lc between adjacent pixel openings of different colors, as shown in fig. 4. The width is related to the size of the pixel opening and the PPI of the display substrate, when the pixel opening is larger, the width is relatively larger, and when the pixel opening is smaller, the width is relatively smaller, so that the display effect of the display substrate in different sizes of the pixel opening can be ensured, and in actual production, the width of Lc is set to be the minimum value under the condition that the process does not overflow.

In an embodiment of the present disclosure, the second pixel defining sublayer 122 includes a lyophilic material layer. The second pixel definition sub-layer 122, by using the lyophilic material layer, can cover the edge difference such as the bottom anode, on one hand, to avoid the breakdown efficiency such as leakage, and on the other hand, when the light emitting layer material forms a thin film, the fluidity at the second pixel definition sub-layer 122 is effectively improved, so that the thin film formed by the light emitting layer material between the sub-pixels of the same color is more uniform.

In the embodiment of the present disclosure, the included angle θ of the long sides La of the pixel openings of the two adjacent sub-pixels of different colors is in the range of 45 degrees to 135 degrees.

According to the embodiment of the disclosure, by setting the long side directions of the pixel openings of two adjacent sub-pixels with different colors, that is, setting the included angle θ in different ranges, the positions of the sub-pixels with different colors can be adjusted, so that the sub-pixels with different colors form a pixel unit, and the pixel unit has a good display effect in the set range.

For example, when the included angle θ is 45 degrees and 135 degrees, a good display effect is obtained, and display defects such as color shift do not occur.

In an exemplary embodiment of the present disclosure, the above-mentioned angle θ may be set to 90 degrees, and as shown in fig. 1, the pixel opening of the red sub-pixel 111 is perpendicular to the length direction of the pixel opening of the green sub-pixel 113 in the length direction, and the pixel opening of the green sub-pixel 113 is perpendicular to the length direction of the pixel opening of the blue sub-pixel 112 in the length direction.

In other embodiments of the present disclosure, by adjusting the pixel opening and the included angle θ, the display effect of the display substrate can be adjusted, and the display defects such as color cast and the like of the produced display substrate can be prevented.

In an embodiment of the present disclosure, the plurality of sub-pixels includes a first direction sub-pixel extending along a first direction and a second direction sub-pixel extending along a second direction, where the first direction and the second direction intersect with each other at an angle θ.

For example, the first direction may be a direction of a long side La of the pixel opening, and the plurality of sub-pixels extending in the first direction are arranged in parallel, and as shown in fig. 1, the plurality of first direction sub-pixels arranged in parallel are formed in a vertical direction. The second direction may be a direction of a short side Lb of the pixel opening, i.e., the second direction sub-pixels are a direction parallel to the direction of Lb, and the second direction sub-pixels derived along the second direction form second direction sub-pixels arranged in parallel in a vertical direction as shown in fig. 1. The first direction and the second direction are intersected, the intersection angle is theta, and the angle theta is larger than 0 degree and smaller than 180 degrees. In one embodiment, the included angle θ is between 45 degrees and 135 degrees.

In an embodiment of the present disclosure, the plurality of sub-pixels includes a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel. The first color sub-pixel, the second color sub-pixel and the third color sub-pixel comprise a first direction sub-pixel and a second direction sub-pixel. The first direction sub-pixels and the second direction sub-pixels are alternately arranged in the third direction. In the third direction, the first color sub-pixel and the third color sub-pixel are respectively arranged on two sides of the second color sub-pixel.

For example, the first color sub-pixel may be red, the second color sub-pixel may be green, and the third color sub-pixel may be blue. Each color sub-pixel has a first direction sub-pixel and a second direction sub-pixel. I.e. each color sub-pixel has two directions of sub-pixels. The first-direction sub-pixels and the second-direction sub-pixels are alternately arranged in the third direction, as shown in fig. 1, and are alternately arranged in the horizontal direction.

In the embodiment of the present disclosure, in the third direction, two sides of the second color sub-pixel are the first color sub-pixel and the third color sub-pixel, respectively. For example, as shown in fig. 1, each color sub-pixel is a different color sub-pixel on both sides of the horizontal direction, such as a blue sub-pixel on the left side and a red sub-pixel on the right side of a green sub-pixel.

In an embodiment of the present disclosure, projections of long sides of the first-direction sub-pixel and the second-direction sub-pixel in a direction perpendicular to the third direction overlap, and projections of short sides of the first-direction sub-pixel and the second-direction sub-pixel in a direction perpendicular to the third direction overlap.

Fig. 5 is a schematic structural diagram of a display device according to an exemplary embodiment of the present disclosure.

Referring to fig. 5, an exemplary embodiment of the present disclosure also provides a display device 500 having the above-described display substrate disposed in the display region C of the display device 500.

In other embodiments of the present disclosure, examples of the display device include a tablet Personal Computer (PC), a smart phone, a Personal Digital Assistant (PDA), a portable multimedia player, a game machine, or a wrist watch type electronic device, and the like. However, embodiments of the present disclosure are not intended to limit the type of display device. In some exemplary embodiments, the display device may be used not only in a large electronic device such as a Television (TV) or an external signboard but also in a medium-or small-sized electronic device such as a PC, a notebook computer, a car navigation device, or a camera.

Referring to fig. 6, the present disclosure also provides a method for manufacturing a display substrate, where a specific manufacturing process 600 includes operations S601 to S602.

In operation S601, a base substrate is formed.

For example, the base substrate 100 is formed on a glass carrier. In an exemplary embodiment, forming the substrate base plate 100 may include: coating a first flexible material film on a glass carrier plate, and forming a first flexible layer after curing and film forming; coating a second flexible material film on the surface of the first flexible layer, which is far away from one side of the glass carrier plate, and forming a second flexible layer after curing and film forming; and coating a third flexible material film on the surface of the second flexible layer, which is far away from one side of the glass carrier plate, and curing to form a film to form a third flexible layer. The substrate 100 for forming a flexible substrate on a glass carrier includes a first flexible layer, a second flexible layer, and a third flexible layer stacked. The first, second and third flexible material films can be made of Polyimide (PI), polyethylene terephthalate (PET), pressure Sensitive Adhesive (PSA) or polymer soft films with surface treatment, the first and second inorganic material films can be made of silicon nitride (SiNx) or silicon oxide (SiOx) for improving the water and oxygen resistance of the substrate, the first and second inorganic layers are called first and second Barrier (Barrier) layers, and the semiconductor layer can be made of amorphous silicon (a-Si).

In an exemplary embodiment, the first, second and third flexible layers may be the same material, or may be different materials. In some possible implementations, the material of the first flexible layer includes a pressure sensitive adhesive, and the material of the second and third flexible layers each includes a polyimide.

In operation S602, a pixel defining layer and a plurality of sub-pixels are formed on a substrate.

In an embodiment of the present disclosure, at least some of the plurality of sub-pixels have a pixel opening, the pixel defining layer surrounding the pixel opening, wherein the plurality of sub-pixels have a plurality of colors, the pixel opening has a long side La and a short side Lb; the long sides La of the pixel openings of two adjacent sub-pixels with different colors have an included angle theta; the pixel definition layer comprises a first pixel definition sub-layer positioned between the pixel openings of the sub-pixels with different colors and a second pixel definition sub-layer positioned between the pixel openings of the adjacent sub-pixels with the same color; the thickness of the second pixel defining sub-layer is less than the thickness of the first pixel defining sub-layer.

For example, the forming of the pixel defining layer on the base substrate may be depositing a transparent conductive film on the base substrate, and patterning the transparent conductive film through a patterning process to form a transparent conductive layer pattern. And then continuously coating a pixel defining film on the substrate with the patterns, carrying out mask exposure and development on the pixel defining film through a patterning process, and forming a pixel defining layer, wherein the pixel defining layer surrounds the pixel opening in each sub-pixel. The light-emitting layer material may be ink-jet printed within the pixel openings surrounded by the pixel defining layer by means of ink-jet printing.

According to the embodiment of the present disclosure, since the thickness of the second pixel defining sub-layer is smaller than that of the first pixel defining sub-layer, the light emitting layer material located between the pixel openings of the adjacent same-color sub-pixels can flow in the adjacent pixel openings, thereby improving the uniformity of the formed thin film of the light emitting layer material.

In an embodiment of the present disclosure, forming the pixel defining layer on the substrate base plate includes: a lyophilic material layer is first formed on a substrate base. And then, forming a lyophobic material layer on one side of the lyophilic material layer, which is far away from the substrate base plate.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A display substrate comprising a base substrate and, on one side of the base substrate, a pixel defining layer and a plurality of sub-pixels, at least some of which have pixel openings, wherein,

the plurality of sub-pixels have a plurality of colors, and the pixel opening has a long side La and a short side Lb;

the long edge La of the pixel opening of two adjacent sub-pixels with different colors has an included angle theta, and the included angle theta is larger than 0 degree and smaller than 180 degrees;

the pixel defining layer comprises a first pixel defining sub-layer positioned between the pixel openings of the sub-pixels with different colors and a second pixel defining sub-layer positioned between the pixel openings of the adjacent sub-pixels with the same color;

a thickness of the second pixel defining sublayer is less than a thickness of the first pixel defining sublayer;

the orthographic projections of the pixel openings of two adjacent sub-pixels of the same color on the long side La have an overlapping region, and the orthographic projections of the second pixel definition sub-layers on the long side La of the pixel openings are positioned in the overlapping region.

2. The display substrate of claim 1, wherein the first pixel-defining sub-layer has a thickness greater than 1 micron.

3. The display substrate of claim 1, wherein the second pixel-defining sub-layer has a thickness in a range of 0.1 to 1 micron.

4. The display substrate of claim 1, wherein the length L1 of the second pixel defining sublayer is 0.2 to 0.5 times the long side La of the pixel opening, and the width L2 of the second pixel defining sublayer is 0.2 to 0.5 times the short side Lb of the pixel opening.

5. The display substrate of claim 4, wherein the relationship between the width L2 of the second pixel defining sublayer and the long side La and the short side Lb of the pixel opening is: l2= La-2Lb.

6. The display substrate of claim 1, wherein the first pixel defining sublayer comprises a lyophilic material layer and a lyophobic material layer disposed on a side of the lyophilic material layer away from the substrate.

7. The display substrate of claim 1, wherein the second pixel-defining sub-layer comprises a layer of lyophilic material.

8. The display substrate of claim 1, wherein the included angle θ is in a range of 45 degrees to 135 degrees.

9. The display substrate of claim 1, wherein the plurality of sub-pixels comprises a first direction sub-pixel extending along a first direction and a second direction sub-pixel extending along a second direction, wherein the first direction and the second direction intersect at an angle θ.

10. The display substrate of claim 9, wherein the plurality of subpixels comprises a first color subpixel, a second color subpixel, and a third color subpixel;

the first color sub-pixel, the second color sub-pixel and the third color sub-pixel comprise a first direction sub-pixel and a second direction sub-pixel;

the first direction sub-pixels and the second direction sub-pixels are alternately arranged in a third direction;

in the third direction, two sides of the second color sub-pixel are the first color sub-pixel and the third color sub-pixel respectively.

11. The display substrate of claim 10, wherein projections of long sides of the first and second direction sub-pixels in a direction perpendicular to the third direction overlap, and projections of short sides of the first and second direction sub-pixels in a direction perpendicular to the third direction overlap.

12. A display device, wherein the display device comprises the display substrate according to any one of claims 1 to 11.

13. A method for manufacturing a display substrate includes:

forming a substrate base plate;

forming a pixel defining layer on the base substrate and a plurality of sub-pixels, at least some of the plurality of sub-pixels having a pixel opening, the pixel defining layer surrounding the pixel opening, wherein,

the orthographic projections of the pixel openings of two adjacent sub-pixels of the same color on the long side La have an overlapping region, and the orthographic projection of the second pixel definition sub-layer on the long side La of the pixel opening is positioned in the overlapping region.

14. The method of manufacturing a display substrate of claim 13, wherein the forming a pixel defining layer on a base substrate comprises:

forming a lyophilic material layer on a substrate base plate;

and forming a lyophobic material layer on one side of the lyophilic material layer, which is far away from the substrate base plate.