# US 11,309,528 B2 · Flexible display panel and fabricating method thereof, flexible display apparatus

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- Number: US 11,309,528 B2
- Document ID: US11309528B2
- Status: Granted
- Kind: B2
- Application number: 16/769,374
- Filed: 2019-10-08
- Published: 2021-07-29
- Granted: 2022-04-19
- Earliest claimed: 2019-03-28
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Wei He; Huili Wu; Shipei Li; Dongsheng Li; Fang He; Renquan Gu; Sheng Xu; Dongsheng Yin; Wusheng Li; Qi Yao
- Web page: https://patentgrep.com/patent/US11309528B2

## CPC

- H10K 71/80: using temporary substrates
- H10K 77/111: {Flexible substrates}
- H10K 59/1201: {Manufacture or treatment}
- H10K 59/873: {Encapsulations}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present disclosure relates to a method of fabricating a flexible display panel. The method of fabricating the flexible display panel may include forming a photosensitive layer comprising at least one azo group on a carrier substrate; forming a flexible substrate on the photosensitive layer; irradiating the photosensitive layer with ultraviolet light; and peeling off the flexible substrate from the carrier substrate.

## Claims

### Claim 1

A method of fabricating a flexible display panel, comprising:
forming a photosensitive layer comprising at least one azo group on a carrier substrate;
forming a flexible substrate on the photosensitive layer;
forming a barrier layer and a display device sequentially on the flexible substrate;
irradiating the photosensitive layer with ultraviolet light; and
peeling off the flexible substrate from the carrier substrate;
wherein the flexible substrate is directly formed on the photosensitive layer;
the barrier layer is formed between the flexible substrate layer and the display device; and
the photosensitive layer comprising the at least one azo group further comprises a phenyl group, the phenyl group further comprises a derivative group, and the derivative group comprises an alkyl group or an aromatic heterocyclic group.

### Claim 2 (depends on 1)

The method according to claim 1, wherein peeling off the flexible substrate from the carrier substrate comprises peeling off the flexible substrate, the barrier layer and the display device from the carrier substrate.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the photosensitive layer comprising at least one azo group is changed from a trans state to a cis state during irradiation with the ultraviolet light.

### Claim 4 (depends on 1)

The method according to claim 1, wherein irradiating the photosensitive layer with ultraviolet light comprises: irradiating the carrier substrate from a side of the carrier substrate opposite from the photosensitive layer with the ultraviolet light.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the ultraviolet light has a wavelength in a range from about 200 nm to about 400 nm.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the photosensitive layer comprising at least one azo group is irradiated with the ultraviolet light for a time in a range from about 1 min to about 30 mins.

### Claim 7 (depends on 1)

The method according to claim 1, wherein peeling off the flexible substrate from the carrier substrate comprises:
peeling off the flexible substrate from the carrier substrate by mechanical or physical adsorption.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the photosensitive layer comprising at least one azo group has a thickness in a range of from about 10 μm to about 1000 μm.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the photosensitive layer comprising at least one azo group is formed on the carrier substrate by a method of dip coating, spray coating, spin coating or pulling or curtain coating.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the carrier substrate comprises a glass, a silicon wafer, or a mica sheet.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the flexible substrate comprises a polymer, a metal foil or a glass, and the polymer is one or a combination of polyimide, polystyrene, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate or a transparent conductive polyester.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the barrier layer comprises SiOx, SiNx, SiON, or a combination thereof.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the display device comprises a thin film transistor driving element, a basic driving circuit, a light emitting unit, and an encapsulation layer.