Flexible display substrate and method for preparing same, and display device

Patent metadata

Field	Value
Publication number	US-12167671-B2
Application number	US-202217569158-A
Country	US
Kind code	B2
Filing date	Jan 5, 2022
Priority date	Mar 8, 2021
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

A method for preparing a flexible display substrate is provided. The method includes: forming an isolating protective film layer on a rigid substrate; forming a flexible base on the isolating protective film layer; forming a functional layer on the flexible base; and stripping the rigid substrate to form the flexible display substrate.

First claim

What is claimed is:

1. A method for preparing a flexible display substrate, comprising:
forming an isolating protective film layer on a rigid substrate;
forming a flexible base on the isolating protective film layer;
forming a functional layer on the flexible base, comprising:
forming the functional layer on the flexible base through evaporation, wherein an orthographic projection of an evaporation shadow region on the rigid substrate is within an orthographic projection of the isolating protective film layer on the rigid substrate, and material of the functional layer goes over edges of the flexible base to be in contact with the isolating protective film layer; and

stripping the rigid substrate to form the flexible display substrate.

2. The method of claim 1 , wherein forming the isolating protective film layer on the rigid substrate comprises:
forming an organic resin solution on the rigid substrate; and
curing the organic resin solution to form the isolating protective film layer.

3. The method of claim 2 , wherein the organic resin solution is formed on the rigid substrate by at least one of:
spray coating, spin coating, or blade coating.

4. The method of claim 1 , wherein after forming the functional layer on the flexible base, the method further comprises:
forming a first protective film layer on the functional layer.

5. The method of claim 4 , wherein an area of an orthographic projection of the first protective film layer on the rigid substrate is larger than an area of an orthographic projection of the functional layer on the rigid substrate.

6. The method of claim 4 , wherein an area of an orthographic projection of the first protective film layer on the rigid substrate is larger than an area of an orthographic projection of the isolating protective film layer on the rigid substrate.

7. A flexible display substrate, comprising:
an isolating protective film layer;
a flexible base, disposed on a side of the isolating protective film layer; and
a functional layer, disposed on a side of the flexible base distal from the isolating protective film layer, wherein the functional layer is formed on the flexible base through evaporation, an orthographic projection of an evaporation shadow region on the rigid substrate is within an orthographic projection of the isolating protective film layer on the rigid substrate, and material of the functional layer goes over edges of the flexible base to be in contact with the isolating protective film layer.

8. The flexible display substrate of claim 7 , wherein the isolating protective film layer comprise an organic resin film layer.

9. The flexible display substrate of claim 8 , wherein the functional layer comprises: a gate layer, a source/drain layer, an anode layer, a gate insulating layer, an interlayer dielectric layer, a planarization layer, a pixel defining layer, a photo spacer layer, and a light emitting layer.

10. The flexible display substrate of claim 7 , further comprising:
a rigid substrate, wherein the isolating protective film layer is disposed on a side of the rigid substrate.

11. The flexible display substrate of claim 10 , wherein an orthographic projection of the functional layer on the rigid substrate is within an orthographic projection of the isolating protective film layer on the rigid substrate.

12. The flexible display substrate of claim 10 , further comprising:
a first protective film layer, disposed on a side of the functional layer distal from the flexible base.

13. The flexible display substrate of claim 12 , wherein an area of an orthographic projection of the first protective film layer on the rigid substrate is larger than an area of an orthographic projection of the functional layer on the rigid substrate.

14. The flexible display substrate of claim 12 , wherein an area of an orthographic projection area of the first protective film layer on the rigid substrate is greater than an orthographic projection of the isolating protective film layer on the rigid substrate.

15. A display device, comprising: a flexible display substrate, wherein the flexible display substrate comprises:
an isolating protective film layer;
a flexible base, disposed on a side of the isolating protective film layer; and
a functional layer, disposed on a side of the flexible base distal from the isolating protective film layer, wherein the functional layer is formed on the flexible base through evaporation, an orthographic projection of an evaporation shadow region on the rigid substrate is within an orthographic projection of the isolating protective film layer on the rigid substrate, and material of the functional layer goes over edges of the flexible base to be in contact with the isolating protective film layer.

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Zhao Jincan
• Yang Sheng
• Wang Yiming
• Cui Yan
• Zhou Jie
• Huang Zhijun

Classifications

• H10K77/111 Primary

  Flexible substrates · CPC title

• H10K71/80 Primary

  using temporary substrates · CPC title

• H10K2102/311

  Flexible OLED · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title