PIXEL DEFINING LAYER AND MANUFACTURING METHOD THEREOF, DISPLAY SUBSTRATE, DISPLAY PANEL

• US 20210020711A1
• Filed: 04/25/2018
• Published: 01/21/2021
• Est. Priority Date: 08/17/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: HU, Chunjing
• Granted Patent: US 10,957,751 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 21/77 Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate electrically programmable read-only memories or multistep manufacturing processes therefor H10B69/00
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/135 using ink-jet printing
• CPC Class Codes: H10K 71/191 characterised by provisions for the orientation or alignment of the layer to be deposited
• CPC Class Codes: H10K 71/40 Thermal treatment, e.g. annealing in the presence of a solvent vapour

Abstract

The present disclosure provides various arrangements of a pixel defining layer. The pixel defining layer includes first and second sub-defining layers sequentially and laminatedly disposed on a base substrate. An orthographic projection of the second sub-defining layer less closer to the base substrate on the base substrate is located within an orthographic projection of the first sub-defining layer closer to the base substrate on the base substrate. A surface of each of the first and second sub-defining layers parallel to a surface of the base substrate is a lyophobic surface, a side surface of each of the first and second sub-defining layers is a lyophilic surface.

Claims

1. A pixel defining layer, comprising:

first and second sub-defining layers sequentially and laminatedly disposed on a base substrate;

wherein an orthographic projection of the second sub-defining layer, less closer to the base substrate, on the base substrate is located within an orthographic projection of the first sub-defining layer, closer to the base substrate, on the base substrate, and wherein a surface of each of the first and second sub-defining layers parallel to a surface of the base substrate is a lyophobic surface, and a side surface of each of the first and second sub-defining layers is a lyophilic surface.

2. The pixel defining layer according to claim 1, further comprising a lyophilic sub-defining layer disposed between the base substrate and the first and second sub-defining layers, wherein the orthographic projections of the first and second sub-defining layers on the base substrate are located within an orthographic projection of the lyophilic sub-defining layer on the base substrate, and wherein a surface of the lyophilic sub-defining layer is a lyophilic surface.

3. The pixel defining layer according to claim 1, wherein the first and second sub-defining layers are formed of an identical material.

4. The pixel defining layer according to claim 1, wherein the first and second sub-defining layers are formed of a fluorine-containing photosensitive material.

5. The pixel defining layer according to claim 4, wherein a fluorine content of the lyophobic surface of each of the first and second sub-defining layers is higher than a fluorine content of the lyophilic surface of each of the first and second sub-defining layers.

6. The pixel defining layer according to claim 1, wherein the first and second sub-defining layers are formed in an integrated structure.

13. A display substrate, comprising the pixel defining layer according to claim 1.

14. The display substrate according to claim 13, wherein the display substrate further comprises:

an anode disposed between the base substrate and the pixel defining layer, and an organic light emitting layer disposed on a side of the anode away from the base substrate.

15. The display substrate according to claim 14, wherein the organic light emitting layer comprises:

at least two sub-layers disposed in a laminated manner, wherein the at least two sub-layers comprise;

a first sub-layer and a second sub-layer, wherein an upper surface of the first sub-defining layer is substantially coplanar with an upper surface of the first sub-layer, and an upper surface of the second sub-defining layer is substantially coplanar with an upper surface of the second sub-layer.

16. The display substrate according to claim 15, wherein an edge portion of the first sub-layer extends onto the upper surface of the first sub-defining layer and is overlapped with at least a portion of the upper surface of the first sub-defining layer and at least a portion of a side surface of the second sub-defining layer.

17. The display substrate according to claim 16, wherein a thickness of the edge portion of the first sub-layer extending onto the upper surface of the first sub-defining layer is smaller than a thickness of the first sub-layer.

18. A display panel comprising:

the display substrate according to claim 13.

19. The pixel defining layer according to claim 1, wherein centers of the orthographic projections of the first and second sub-defining layers coincide.

20. The pixel defining layer according to claim 1, wherein edges of the orthographic projections of the first and second orthographic projections are offset by a certain distance.

7. A method for manufacturing a pixel defining layer, comprising:

providing a base substrate; and

forming first and second sub-defining layers on the base substrate,

wherein an orthographic projection of the second sub-defining layer, less closer to the base substrate, on the base substrate is located within an orthographic projection of the first sub-defining layer, closer to the base substrate, on the base substrate, a surface of each of the first and second sub-defining layers parallel to a surface of the base substrate is a lyophobic surface, and a side surface of each of the first and second sub-defining layers is a lyophilic surface.

8. The manufacturing method according to claim 7, wherein before forming the first and second sub-defining layers on the base substrate, the method further comprises:

forming a lyophilic sub-defining layer on the base substrate, the orthographic projections of the first and second two sub-defining layers on the base substrate are located within an orthographic projection of the lyophilic sub-defining layer on the base substrate, and a surface of the lyophilic sub-defining layer is a lyophilic surface.

9. The manufacturing method according to claim 7, wherein forming first and second sub-defining layers on the base substrate comprises:

forming a sub-defining film layer on the base substrate;

exposing the sub-defining film layer with a halftone mask from a side of the sub-defining film layer away from the base substrate;

developing the exposed sub-defining film layer; and

performing thermal treatment on the developed sub-defining film layer to obtain the first and second sub-defining layers.

10. The manufacturing method according to claim 9, wherein

the sub-defining film layer is formed of a fluorine-containing photosensitive material.

11. The manufacturing method according to claim 10, wherein

a fluorine content of the lyophobic surface of each of the first and second sub-defining layers is higher than a fluorine content of the lyophilic surface of each of the first and second sub-defining layers.

12. The manufacturing method according to claim 10, wherein the halftone mask comprises at least two light transmitting regions, and the at least two light transmitting regions have different degrees of light transmission, and exposing the sub-defining film layer with a halftone mask comprises:

exposing the sub-defining film layer through the at least two light transmitting regions, such that the exposed sub-defining film layer comprises at least two exposed regions, wherein respective exposed regions of the exposed sub-defining film layer have different thicknesses after developing the exposed sub-defining film layer.