# US 11,309,378 B2 · Method of manufacturing flexible display

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- Number: US 11,309,378 B2
- Document ID: US11309378B2
- Status: Granted
- Kind: B2
- Application number: 16/753,807
- Filed: 2020-04-06
- Published: 2021-05-06
- Granted: 2022-04-19
- Earliest claimed: 2019-10-31
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Shuai Wang
- Web page: https://patentgrep.com/patent/US11309378B2

## CPC

- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 77/111: {Flexible substrates}
- H10K 59/1201: {Manufacture or treatment}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method of manufacturing flexible display is disclosed. The method includes the steps of: providing a substrate, wherein the substrate includes a display area and a bending area; forming an inorganic layer on the substrate; etching the inorganic layer of the bending area of the substrate, and replacing the inorganic layer with a first organic layer; forming a metal wiring layer on the first organic layer; patterning the metal wiring layer; and forming a second organic layer on the metal wiring layer. By utilizing the method of manufacturing flexible display, the risk of metal wiring peeling and cracking during the bending process of the flexible display is reduced.

## Claims

### Claim 1

A method of manufacturing a flexible display, comprising:
coating a polyimide solution on a glass and curing the polyimide solution to obtain a substrate, wherein the substrate includes a display area and a bending area;
forming an inorganic layer on the substrate;
etching away a part of the inorganic layer in the bending area, and replacing the part of the inorganic layer with a first organic layer;
forming a metal wiring layer on the first organic layer;
patterning the metal wiring layer into a wire, wherein the wire has one or more protruding portions, the protruding portions define a surface of the wire away from the substrate, and a surface of the wire close to the substrate is a flat surface; and
forming a second organic layer covering the wire.

### Claim 2 (depends on 1)

The method of manufacturing the flexible display according to claim 1, wherein the protruding portions are protrudingly disposed in the second organic layer.

### Claim 3 (depends on 1)

The method of manufacturing the flexible display according to claim 1, wherein the protruding portions are circular, oval, rectangular, square, or rhombic.

### Claim 4 (depends on 1)

The method of manufacturing the flexible display according to claim 1, wherein the first organic layer is made of polyimide.

### Claim 5 (depends on 1)

The method of manufacturing the flexible display according to claim 1, wherein the second organic layer is made of polyimide.

### Claim 6 (depends on 1)

The method of manufacturing the flexible display according to claim 1, wherein a thickness of the first organic layer is 1 to 10 μm.

### Claim 7 (depends on 1)

The method of manufacturing the flexible display according to claim 1, wherein a thickness of the second organic layer is 1 to 10 μm.

### Claim 8

A method of manufacturing a flexible display, comprising:
providing a substrate, wherein the substrate includes a display area and a bending area;
forming an inorganic layer on the substrate;
etching away a part of the inorganic layer in the bending area, and replacing the part of the inorganic layer with a first organic layer;
forming a metal wiring layer on the first organic layer;
patterning the metal wiring layer into a wire, wherein the wire has one or more protruding portions, the protruding portions define a surface of the wire away from the substrate, and a surface of the wire close to the substrate is a flat surface; and
forming a second organic layer covering the wire.

### Claim 9 (depends on 8)

The method of manufacturing the flexible display according to claim 8, wherein the protruding portions are protrudingly disposed in the second organic layer.

### Claim 10 (depends on 8)

The method of manufacturing the flexible display according to claim 8, wherein the protruding portions are circular, oval, rectangular, square, or rhombic.

### Claim 11 (depends on 8)

The method of manufacturing the flexible display according to claim 8, wherein the first organic layer is made of polyimide.

### Claim 12 (depends on 8)

The method of manufacturing the flexible display according to claim 8, wherein the second organic layer is made of polyimide.

### Claim 13 (depends on 8)

The method of manufacturing the flexible display according to claim 8, wherein a thickness of the first organic layer is 1 to 10 μm.

### Claim 14 (depends on 8)

The method of manufacturing the flexible display according to claim 8, wherein a thickness of the second organic layer is 1 to 10 μm.