CN110212003B - Display substrate, preparation method thereof and display device - Google Patents

Display substrate, preparation method thereof and display device Download PDF

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Publication number
CN110212003B
CN110212003B CN201910511562.5A CN201910511562A CN110212003B CN 110212003 B CN110212003 B CN 110212003B CN 201910511562 A CN201910511562 A CN 201910511562A CN 110212003 B CN110212003 B CN 110212003B
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layer
opening
substrate
openings
lyophobic
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CN110212003A (en
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赵德江
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing

Abstract

The present invention provides a display substrate, comprising: the substrate base plate, it sets up to be provided with along keeping away from substrate base plate direction range upon range of in proper order on the substrate base plate: a pixel defining layer, a first lyophobic layer, and a second lyophobic layer; the liquid repellency of the second liquid-repellent layer is higher than the liquid repellency of the first liquid-repellent layer and the pixel defining layer; the pixel defining layer is provided with a plurality of pixel openings, the first lyophobic layer is provided with first openings which are communicated with the pixel openings in a one-to-one correspondence manner, and the second lyophobic layer is provided with second openings which are communicated with the first openings in a one-to-one correspondence manner; a part of the first lyophobic layer is exposed by the second opening; the opening area of the second opening decreases as the distance from the second opening to the center of the display substrate increases. The invention also provides a preparation method of the display substrate and a display device. The area of the second opening is adjusted, so that the volatilization speeds of the liquid in the pixel openings of the whole display substrate are kept consistent, and the display uniformity of the formed display area is improved.

Description

Display substrate, preparation method thereof and display device
Technical Field
The invention relates to the field of display, in particular to a display substrate, a preparation method thereof and a display device
Background
The technology and equipment for manufacturing Organic Light-Emitting Diode (OLED) products by using an inkjet printing method are becoming mature and gradually put into mass production. The preparation method of the OLED screen for ink-jet printing mainly comprises the steps of dissolving OLED organic materials by using a solvent, and then directly spraying and printing the materials in pixel openings of a pixel defining layer to form an organic light-emitting layer.
When the ink-jet printing is carried out, the solvent volatilization speed is higher in the area close to the edge of the substrate and the solvent volatilization speed is lower in the central area under the influence of factors such as gas atmosphere generated during printing, printing time difference and the like, so that the display uniformity of the formed display area is poor.
Disclosure of Invention
The invention aims to at least solve one technical problem in the prior art, and provides a display substrate, a preparation method thereof and a display device.
In order to achieve the above object, the present invention provides a display substrate comprising:
the substrate base plate, it sets up to be provided with along keeping away from substrate base plate direction range upon range of in proper order on the substrate base plate: a pixel defining layer, a first lyophobic layer, and a second lyophobic layer;
the liquid repellency of the second liquid-repellent layer is higher than the liquid repellency of the first liquid-repellent layer and the pixel defining layer;
the pixel defining layer is provided with a plurality of pixel openings, the first lyophobic layer is provided with first openings which are communicated with the pixel openings in a one-to-one correspondence manner, and the second lyophobic layer is provided with second openings which are communicated with the first openings in a one-to-one correspondence manner; a part of the first lyophobic layer is exposed by the second opening;
the opening area of the second opening decreases as the distance from the second opening to the center of the display substrate increases.
Optionally, an orthographic projection of the first opening on the substrate base plate is located within an orthographic projection of the second opening on the substrate base plate.
Optionally, the edge of the first orthographic projection is not in contact with the edge of the second opening in the orthographic projection of the substrate base plate.
Optionally, an orthographic projection of the pixel opening on the substrate does not exceed an orthographic projection of the first opening on the substrate.
Optionally, the pixel openings are arranged in an array.
Alternatively, the cross-sectional area of the pixel opening is gradually reduced in a direction gradually approaching the substrate base plate.
Optionally, a contact angle of a liquid for forming the organic light emitting layer on the second lyophobic layer is greater than 80 °, a contact angle of the liquid on the first lyophobic layer is between 40 ° and 60 °, and a contact angle of the liquid on the pixel defining layer is between 50 ° and 70 °.
Optionally, the thickness of the pixel defining layer is between 1.5 μm and 2 μm, and the thickness of each of the first lyophobic layer and the second lyophobic layer is between 0.2 μm and 0.5 μm.
In order to achieve the above object, the present invention further provides a display device including the above display substrate.
In order to achieve the above object, the present invention also provides a method for manufacturing a display substrate, including:
providing a substrate base plate;
forming a pixel defining layer on the substrate, wherein a plurality of pixel openings are formed on the pixel defining layer;
forming a first lyophobic layer on one side of the pixel defining layer, which is far away from the substrate, wherein first openings which are correspondingly communicated with the pixel openings one by one are formed in the first lyophobic layer;
a second lyophobic layer is formed on one side, away from the substrate, of the first lyophobic layer, and second openings which are communicated with the first openings in a one-to-one correspondence mode are formed in the second lyophobic layer;
wherein the lyophobicity of the second lyophobic layer is higher than the lyophobicity of the first lyophobic layer and the pixel defining layer; a part of the first lyophobic layer is exposed by the second opening;
the opening area of the second opening decreases as the distance from the second opening to the center of the display substrate increases.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a longitudinal section of a display substrate according to an embodiment of the invention;
FIG. 2 is a schematic view of a liquid on a lyophobic layer having different lyophobicity;
FIG. 3 is a schematic diagram illustrating a second trend of the opening area according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an orthographic projection of each opening on a substrate provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of an array arrangement of openings on a display substrate according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a liquid drying process provided by an embodiment of the present invention;
fig. 7 is a flowchart of a method for manufacturing a display substrate according to an embodiment of the invention.
Wherein the reference numerals include:
10. a substrate base plate; 11/12, lyophobic layer; 20. a pixel defining layer; 21. a pixel opening; 22. orthographic projection of the pixel opening on the substrate base plate; 30. a first lyophobic layer; 31. a first opening; 32. orthographic projection of the first opening on the substrate base plate; 40. a second lyophobic layer; 41. a second opening; 42. orthographic projection of the second opening on the substrate base plate; liq, liquid.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
An embodiment of the present invention provides a display substrate, and fig. 1 is a schematic view of a longitudinal section of the display substrate provided in the embodiment of the present invention, as shown in fig. 1, the display substrate includes: the substrate 10, there are the following stacked setting in proper order along keeping away from substrate 10 on the substrate 10: a pixel defining layer 20, a first lyophobic layer 30, and a second lyophobic layer 40. Specifically, the pixel defining layer 20 is provided on the base substrate 10, and the first lyophobic layer 30 is provided on a side of the pixel defining layer 20 away from the base substrate 10, and the second lyophobic layer 40 is provided on a side of the first lyophobic layer 30 away from the base substrate 10.
The liquid repellency of the second liquid-repellent layer 40 is higher than the liquid repellency of the first liquid-repellent layer 30 and the pixel defining layer 20. Specifically, the lyophobicity of the second lyophobic layer 40 is highest, the lyophobicity of the pixel defining layer 20 is second highest, and the lyophobicity of the first lyophobic layer 30 is lowest.
The pixel defining layer 20 is provided with a plurality of pixel openings 21, the first lyophobic layer 30 is provided with first openings 31 communicating with the pixel openings 21 in a one-to-one correspondence, and the second lyophobic layer 40 is provided with second openings 41 communicating with the first openings 31 in a one-to-one correspondence. A part of the first lyophobic layer 30 is exposed by the second opening 41. Specifically, fig. 2 is a schematic view showing a state where a liquid is present on lyophobic layers having different lyophobicity, and as shown in fig. 2, the hydrophobicity of the lyophobic layer 11 is larger than that of the lyophobic layer 12, and the contact angle of the liquid Liq on the lyophobic layer 12 is smaller and more easily spread for the same volume of the liquid Liq, and in this case, the surface area of the liquid Liq is also larger; the liquid Liq has a small surface area when the contact angle of the liquid Liq in the lyophobic layer 11 is large and the liquid surface rises. According to the principle of evaporation, for the same volume of liquid, when the surface area is large, the evaporation is faster, and when the surface area is small, the evaporation is slower, so that the evaporation speed of the liquid can be adjusted by adjusting the surface area of the liquid.
Since the first lyophobic layer 30 has poor lyophobicity and good hydrophilicity, the liquid Liq may cover a portion of the first lyophobic layer 30 exposed by the second opening 41 and extend onto the second lyophobic layer 40, and at the same time, since the lyophobicity of the second lyophobic layer 40 is high, spreading of the liquid Liq may be suppressed, thereby maintaining the liquid Liq on the upper surface of the second lyophobic layer 40.
The opening area of the second opening 41 decreases as the distance from the second opening 41 to the center of the display substrate increases. The opening area of the second opening 41 is an area of an orthogonal projection of the second opening 41 on the substrate base plate. Specifically, for any two second openings 41, the area of the second opening 41 far from the center of the display substrate is larger than the area of the second opening 41 near the center of the display substrate. Fig. 3 is a schematic diagram illustrating a variation trend of the second opening area according to an embodiment of the present invention, as shown in fig. 3, the area of the second opening 41 at the position a is the smallest, the position b is closer to the center of the display substrate than the position a, and therefore the area of the second opening 41 at the position b is larger than the area of the second opening 41 at the position a, and the position c is closer to the center of the display substrate than the position b, and therefore the area of the second opening 41 at the position c is larger than the area of the second opening 41 at the position b. Since the liquid Liq is maintained on the level of the second lyophobic layer 40, the extended area of the liquid Liq is larger as the area of the second opening increases.
The first openings in the display substrate have the same size. It should be noted that the center of the display substrate is the center of the area where all the pixel openings are located, that is, the center of the display area of the display panel.
Based on the above, even if the area of the second opening 41 is increased, the liquid Liq can be maintained on the upper surface of the second lyophobic layer 40, and therefore, the larger the area of the second opening 41 is, the larger the surface area of the liquid Liq is, and it is known that the volatilization speed of the liquid Liq is faster as the surface area is larger for the same volume of liquid according to factors affecting the volatilization speed of the liquid Liq, and therefore, the volatilization speed of the liquid Liq in each pixel opening on the display substrate can be adjusted to be uniform by the above configuration.
It should be noted that the lyophobic materials used for the pixel defining layer 20, the first lyophobic layer 30 and the second lyophobic layer 40 may be hydrophobic and oleophilic materials, such as polyimide, polysiloxane, polymethyl methacrylate, polybutyl methacrylate, polycyclohexyl methacrylate, polystyrene, or the like. The lyophobic material used for the pixel defining layer 20, the first lyophobic layer 30, and the second lyophobic layer 40 may also be a hydrophobic and oleophobic material, such as polyhexafluoropropylene, fluorinated parylene, fluorinated silicone-based ether, fluorinated polyimide, fluorinated polyamide, or the like.
In summary, in the display substrate according to the embodiment of the invention, the first lyophobic layer 30 having a low lyophobic property and the second lyophobic layer 40 having a high lyophobic property are disposed on the pixel defining layer 20 to adjust the surface area of the liquid Liq, and further, the area of the second opening 41 in the region (for example, the edge) where the liquid evaporation rate is high is set to be small on the display substrate, so that the liquid Liq has a small surface area to slow down the evaporation rate of the liquid Liq, and the area of the second opening 41 in the region (for example, the center) where the evaporation rate is low is set to be large to have a large surface area to accelerate the evaporation rate of the liquid Liq, so that the evaporation rates of the liquid Liq in the pixel openings 21 of the entire display substrate are kept consistent, and the display uniformity of the formed display region is improved.
Fig. 4 is a schematic diagram of an orthographic projection of each opening on the substrate base plate according to the embodiment of the present invention, and as shown in fig. 4, an orthographic projection 32 of the first opening 31 on the substrate base plate 10 is located in an orthographic projection 42 of the second opening 41 on the substrate base plate 10.
Optionally, the edge of the orthographic projection 32 is free from the edge of the second opening 41 at the orthographic projection 42 of the substrate base plate 10.
Optionally, an orthographic projection of the pixel opening 21 on the substrate base plate 10 does not exceed an orthographic projection 22 of the first opening 21 on the substrate base plate 10.
Specifically, an orthographic projection 22 of the pixel opening 21 on the substrate base plate 10 is located in an orthographic projection 32 of the first opening 31 on the substrate base plate 10, the orthographic projection 32 of the first opening 31 on the substrate base plate 10 is located in an orthographic projection 42 of the second opening 41 on the substrate base plate 10, and the orthographic projection of the pixel opening 21 on the substrate base plate 10, the orthographic projection 32 of the first opening 31 on the substrate base plate 10 and the orthographic projection 42 of the second opening 41 on the substrate base plate 10 are rectangular or rectangular with a chamfer.
Optionally, the pixel openings 21 are arranged in an array on the display substrate. Specifically, for any two second openings 41 in the same row, the area of the second opening 41 away from the center of the display substrate is larger than the area of the second opening 41 near the center of the display substrate. For any two second openings 41 in the same column, the area of the second opening 41 away from the center of the display substrate is larger than the area of the second opening 41 near the center of the display substrate.
For example, fig. 5 is a schematic view of the openings arranged in an array on the display substrate according to the embodiment of the present invention, as shown in fig. 5, amnThe position of each pixel opening 21 on the display substrate is shown, where m is the number of rows and n is the number of columns, the pixel openings 21 are arranged in an array on the display substrate, and the position a is the same row example12Compared with position A11In other words, it is located closer to the center of the display substrate, thus position A12Is compared with the position a11Has a larger area, position a, of the second opening 4113Compared with position A12In other words, it is located closer to the center of the display substrate, and thus, position A13Is compared with the position a12The area of the second opening 41 is larger; position A1(n-1)Compared with position A1nIn other words, it is located closer to the center of the display substrate, thus position A1(n-1)Is compared with the position a1nHas a larger area, position a, of the second opening 411(n-2)Compared with position A1(n-1)In other words, it is located closer to the center of the display substrate, and thus, position A1(n-2)Is compared with the position a1(n-1)The area of the second opening 41 is larger. Position A, for example, using the same column position21Compared with position A11In other words, it is located closer to the center of the display substrate, thus position A21Is compared with the position a11Has a larger area, position a, of the second opening 41(m-1)1Compared with position Am1In a wordLocated closer to the center of the display substrate, thus position A(m-1)1Is compared with the position a(m-1)1The area of the second opening 41 is larger.
By analogy, the area size relationship of the second openings 41 at the rest positions in the display substrate can be obtained, and details are not repeated herein.
Wherein the area of the second opening 41 may be set to be y times of the reference area, wherein y is (1/a)ij，a>1, the specific value can be determined according to the ink property and the size of the second opening; i is the number of rows of the second openings 41, and j is the number of columns of the second openings 41.
Alternatively, the area of the cross section of the pixel opening 21 is gradually reduced in a direction gradually approaching the substrate, and specifically, as shown in fig. 1, the pixel opening has an inverted trapezoidal shape with a wide top and a narrow bottom. Further, the inverted trapezoid is an isosceles trapezoid. The cross section is a cross section perpendicular to the thickness direction of the display substrate.
Alternatively, the contact angle of the liquid for forming the organic light emitting layer on the second lyophobic layer 40 is greater than 80 °, for example, may be between 80 ° and 120 °, the contact angle of the liquid on the first lyophobic layer 30 is between 40 ° and 60 °, and the contact angle of the liquid on the pixel defining layer 20 is between 50 ° and 70 °. The organic light emitting layer is any layer of the light emitting unit, such as a hole injection layer, a hole transport layer, a light emitting layer, and the like. That is, the contact angle of the ink of each film layer of the light emitting unit satisfies the above-described setting.
Optionally, the thickness of the pixel defining layer 20 is between 1.5 μm and 2 μm, and the thickness of each of the first lyophobic layer and the second lyophobic layer is between 0.2 μm and 0.5 μm.
Fig. 6 is a schematic diagram of a liquid drying process according to an embodiment of the present invention, and as shown in fig. 6, the drying process of the display substrate according to an embodiment of the present invention is divided into three stages, where the first stage adjusts the surface area of the liquid Liq by adjusting the size of the second opening, so as to control the evaporation rate; a second stage in which the liquid Liq is continuously volatilized, the volume of the liquid Liq is reduced, the liquid Liq falls on the first lyophobic layer 30, and the shapes of the first openings 31 and the pixel openings 21 are the same, so that the surface area of the liquid Liq at this stage is the same, and the evaporation rate is the same; in the third stage, the liquid Liq is dropped into the pixel openings 21, and the final drying is performed, and the film formation areas in the respective pixel openings 21 are kept uniform after the drying. Here, the liquid Liq is an ink for forming an organic light-emitting layer.
An embodiment of the present invention further provides a display device, where the display device may include: the embodiment of the invention provides a display substrate.
The display device can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Illustratively, the display device may be an OLED display panel.
An embodiment of the present invention provides a method for manufacturing a display substrate, and fig. 7 is a flowchart of the method for manufacturing a display substrate according to the embodiment of the present invention, and with reference to fig. 1 and 7, the method may include:
s710, providing a substrate base plate 10.
The substrate 10 may be a transparent substrate, and may be a substrate made of a light-guiding and non-metallic material having a certain hardness, such as glass, quartz, or transparent resin.
S720, a pixel defining layer 20 is formed on the substrate 10, and a plurality of pixel openings 21 are formed on the pixel defining layer 20.
Specifically, the pixel defining material layer is formed on the base substrate 10 to a thickness that can be determined according to the actual situation, and is preferably between 1.5 μm and 2 μm. Then, the pixel defining material layer is patterned to obtain a pixel defining layer with a plurality of pixel openings. Of course, the first openings may be patterned and then thinned to 1.5 μm to 2 μm by a Plasma Ashing (Plasma Ashing) process.
After the photoresist film is spin-coated or drop-coated, it is exposed and developed to form a plurality of pixel openings 21, and the cross sections of the plurality of pixel openings 21 are formed to be gradually reduced in a direction approaching the substrate base plate 10.
S730, forming a first lyophobic layer 30 on a side of the pixel defining layer 20 away from the substrate base plate 10, and forming first openings 31 on the first lyophobic layer 30, which are in one-to-one correspondence with the pixel openings 21.
Specifically, a plurality of first openings 31 corresponding one-to-one to the plurality of pixel openings 21 are formed by means of exposure and development.
S740, forming a second lyophobic layer 40 on a side of the first lyophobic layer 30 facing away from the substrate; the second lyophobic layer 40 is formed with second openings 41 communicating with the first openings 31 in a one-to-one correspondence.
Wherein the lyophobicity of the second lyophobic layer 40 is higher than the lyophobicity of the first lyophobic layer 30 and the pixel defining layer 20. A part of the first lyophobic layer 30 is exposed by the second opening 41. The opening area of the second opening 41 decreases as the distance from the second opening 41 to the center of the display substrate increases.
Specifically, the plurality of second openings 41 are formed in one-to-one correspondence with the plurality of first openings 31 by means of exposure and development. For any two second openings 41, the area of the second opening 41 away from the center of the display substrate is larger than the area of the second opening 41 near the center of the display substrate.
Before the pixel defining layer 20 is formed on the substrate 10, a Thin Film Transistor (TFT) array, a planarization layer, an anode, and other structures may be formed on the substrate 10.
After the second lyophobic layer is formed, a step of dripping liquid into the pixel opening to form an organic light emitting layer is further included.
In summary, the display substrate provided in the embodiments of the invention adjusts the surface area of the liquid by disposing the first lyophobic layer 30 with low lyophobic property and the second lyophobic layer 40 with high lyophobic property on the pixel defining layer 20, and further, on the display substrate, the area of the second opening 41 in the region (for example, the edge) where the volatilization speed of the liquid is fast is disposed to be small, so that the liquid has a small surface area, thereby slowing down the volatilization speed of the liquid, while the area of the second opening 41 in the region (for example, the center) where the volatilization speed is slow is disposed to be large, so that the liquid has a large surface area, thereby speeding up the volatilization of the liquid, and therefore, the volatilization speeds of the liquid in the pixel openings of the whole display substrate are kept consistent, thereby improving the display uniformity of the formed display region.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A display substrate, comprising: the substrate base plate, be provided with on the substrate base plate along keeping away from the substrate base plate direction is range upon range of setting in proper order: a pixel defining layer, a first lyophobic layer, and a second lyophobic layer;
the second lyophobic layer has a lyophobicity higher than the lyophobicity of the first lyophobic layer and the pixel defining layer;
the pixel defining layer is provided with a plurality of pixel openings, the first lyophobic layer is provided with first openings which are in one-to-one correspondence communication with the pixel openings, and the second lyophobic layer is provided with second openings which are in one-to-one correspondence communication with the first openings; a portion of the first lyophobic layer is exposed by the second opening;
the opening area of the second opening decreases with increasing distance from the second opening to the center of the display substrate.
2. The display substrate of claim 1, wherein an orthographic projection of the first opening on the substrate base is located within an orthographic projection of the second opening on the substrate base.
3. The display substrate of claim 2, wherein an edge of an orthographic projection of the first opening on the substrate base is free from contact with an edge of an orthographic projection of the second opening on the substrate base.
4. A display substrate as claimed in any one of claims 1 to 3, wherein an orthographic projection of the pixel opening on the substrate does not exceed an orthographic projection of the first opening on the substrate.
5. The display substrate of any one of claims 1 to 3, wherein the pixel openings are arranged in an array.
6. The display substrate according to any one of claims 1 to 3, wherein the cross-sectional area of the pixel opening is gradually reduced in a direction gradually approaching the substrate base.
7. A display substrate according to any one of claims 1 to 3, wherein the contact angle of the liquid used to form the organic light-emitting layer on the second lyophobic layer is greater than 80 °, the contact angle of the liquid on the first lyophobic layer is between 40 ° and 60 °, and the contact angle of the liquid on the pixel defining layer is between 50 ° and 70 °.
8. The display substrate according to any one of claims 1 to 3, wherein the pixel defining layer has a thickness of between 1.5 μm and 2 μm, and the first lyophobic layer and the second lyophobic layer each have a thickness of between 0.2 μm and 0.5 μm.
9. A display device comprising the display substrate according to any one of claims 1 to 8.
10. A method for preparing a display substrate is characterized by comprising the following steps:
providing a substrate base plate;
forming a pixel defining layer on the substrate base plate, the pixel defining layer having a plurality of pixel openings formed thereon;
forming a first lyophobic layer on one side of the pixel defining layer, which is far away from the substrate, wherein first openings which are communicated with the pixel openings in a one-to-one correspondence mode are formed in the first lyophobic layer;
forming a second lyophobic layer on one side of the first lyophobic layer, which is far away from the substrate, wherein second openings which are correspondingly communicated with the first openings one by one are formed in the second lyophobic layer;
wherein a lyophobicity of the second lyophobic layer is higher than a lyophobicity of the first lyophobic layer and the pixel defining layer; a portion of the first lyophobic layer is exposed by the second opening;
the opening area of the second opening decreases with increasing distance from the second opening to the center of the display substrate.
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