Method for manufacturing display panel, display panel and display device

• US 10,871,682 B2
• Filed: 06/12/2018
• Issued: 12/22/2020
• Est. Priority Date: 09/29/2017
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Cao, Wei
• Primary Examiner(s): McPherson, John A
• Application Number:
  US16/006,021
• Publication Number:
  US 20190101781A1
• Time in Patent Office: 924 Days
• Field of Search: 430320, 430321, 349123, 349156
• CPC Class Codes: C01B 32/198 Graphene oxide
• CPC Class Codes: C09K 19/56 Aligning agents
• CPC Class Codes: G02F 1/133723 Polyimide, polyamide-imide
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G02F 1/133796 having conducting property
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13398 Spacer materials; Spacer properties
• CPC Class Codes: G02F 2202/022 polymeric
• CPC Class Codes: G02F 2202/16 conductive
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: G03F 7/027 Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds G03F7/075 takes precedence
• CPC Class Codes: G03F 7/2002 with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image

Abstract

A method for manufacturing a display panel, a display panel and a display device are provided. The method for manufacturing a display panel includes: mixing a liquid crystal material and a spacer preparation material, and injecting them between an array substrate and a color filter substrate which are assembled; performing a UV irradiation on the assembled array substrate and the color film substrate with ultraviolet rays by using a mask plate to polymerize the spacer preparation material to form spacers, the spacers connecting the array substrate and the color film substrate.

Claims

1. A method for manufacturing a display panel, comprising:

mixing a liquid crystal material and a spacer preparation material, and injecting them between an array substrate and a color filter substrate which are assembled;

performing a UV irradiation on the assembled array substrate and the color film substrate with ultraviolet rays by using a mask plate to polymerize the spacer preparation material to form spacers, the spacers connecting the array substrate and the color film substrate, wherein

the spacer is a conductive spacer.

2. The method according to claim 1, wherein after the step of performing a UV irradiation on the assembled array substrate and the color film substrate with ultraviolet rays by using a mask plate, the method further comprises:

heat-treating the assembled array substrate and the color filter substrate irradiated by the ultraviolet.

3. The method according to claim 1, wherein the spacer preparation material is a polymerizable monomer doped with a conductive polymer monomer.

4. The method according to claim 3, wherein the polymerizable monomer comprises any one of acetylene-doped acrylic acid, thiophene-doped acrylic acid, pyrrole-doped acrylic acid, and aniline-doped acrylic acid.

5. The method according to claim 3, wherein a mass ratio of the polymerizable monomer in a mixture of the polymerizable monomer and the liquid crystal material is 5% to 10%;

and a mass ratio of the conductive polymer monomer in the polymerizable monomer is 10% to 20%.

6. The method according to claim 1, further comprising:

forming a conductive alignment film on the array substrate and the color filter substrate, respectively.

7. The method according to claim 6, wherein a material of the conductive alignment film comprises a composite containing at least graphene and polyimide.

8. The method according to claim 7, wherein the composite of graphene and polyimide is prepared by the following steps:

preparing graphene oxide,

preparing a graphene oxide-polyacrylic acid solution,

reducing the graphene oxide-polyacrylic acid solution to obtain a composite containing at least graphene and polyimide.

9. The method according to claim 8, wherein the step of preparing graphene oxide comprises:

stirring and mixing concentrated sulfuric acid, graphite powder, K₂S₂O₈ (potassium persulfate), and P₂O₅ (diphosphorus pentoxide) to obtain a mixture,

making the mixture react in a water bath at 80°

C., diluting them with water, centrifugalizing a product formed by reacting and diluting, and placing the product processed by centrifugalizing into a vacuum oven and drying it therein,

mixing the product processed by drying with concentrated sulfuric acid and KMnO4 (potassium permanganate) in an ice bath and stirring them, then diluting them with water, and in turn stirring them, then adding an appropriate amount of H₂O₂ aqueous solution (hydrogen peroxide) and centrifugalizing the product to obtain graphene oxide,

removing impurities from the graphene oxide by one of washing with hydrochloric acid and water and dialysis, and

performing an ultrasonic dispersion.

10. The method according to claim 8, wherein the step of preparing a graphene oxide-polyacrylic acid solution comprises:

dissolving graphene oxide and polyacrylic acid in ultrapure water respectively, and performing an ultrasonic dispersion, and

mixing the graphene oxide aqueous solution and the polyacrylic acid aqueous solution at a certain ratio and stirring them, and performing an ultrasonic treatment to obtain a uniformly dispersed graphene oxide-polyacrylic acid solution.

11. The method according to claim 8, wherein the step of preparing a graphene oxide-polyacrylic acid solution comprises:

dissolving graphene oxide and polyacrylic acid respectively in NMP (N-methyl-2-pyrrolidone) solution, and

mixing the graphene oxide NMP solution and the polyacrylic acid NMP solution at a certain ratio and stirring them at a certain temperature to obtain a graphene oxide-polyacrylic acid solution.

12. The method according to claim 8, wherein the step of reducing the graphene oxide-polyacrylic acid solution comprises:

reducing graphene oxide in the graphene oxide-polyacrylic acid solution to graphene, and reducing polyacrylic acid in the graphene oxide-polyacrylic acid solution to polyimide, with a chemical reduction or a thermal reduction.

13. The method according to claim 8, wherein the composite containing at least graphene and polyimide further contained unreduced polyacrylic acid.