# US 11,443,658 B2 · Flexible display panels, manufacturing methods thereof and flexible display apparatuses

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- Number: US 11,443,658 B2
- Document ID: US11443658B2
- Status: Granted
- Kind: B2
- Application number: 16/997,175
- Filed: 2020-08-19
- Published: 2020-12-03
- Granted: 2022-09-13
- Earliest claimed: 2018-11-29
- Assignees: KunShan Go-Visionox Opto-Electronics Co., Ltd
- Applicants: KunShan Go-Visionox Opto-Electronics Co., Ltd
- Inventors: Zupan Mao; Yangjie Zhu; Bo Wei; Haifeng Lu
- Web page: https://patentgrep.com/patent/US11443658B2

## CPC

- H10K 77/111: {Flexible substrates}
- G09F 9/301: {flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED}
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 2102/00: Constructional details relating to the organic devices covered by this subclass
- 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
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- 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

Included are flexible display panels, manufacturing methods thereof and flexible display apparatuses, which are used to solve the problem of poor conductive function of wires in a bending area. The flexible display panel includes a display area and a bending area located around the display area, where the bending area includes: a flexible substrate; an adjustment layer covering the entire flexible substrate; a protective layer located on the adjustment layer; a plurality of wires located on the protective layer; and a planarization layer located above the wires and covering a functional film layer on the flexible substrate; where the protective layer corresponds to the wires in the bending area, and an orthographic projection of the wires in the bending area on the flexible substrate falls into an orthographic projection of the protective layer on the flexible substrate.

## Claims

### Claim 1

A flexible display panel, comprising a display area and a bending area located around the display area, wherein the bending area comprises:
a flexible substrate;
an adjustment layer, covering the entire flexible substrate;
a protective layer, located on the adjustment layer;
a plurality of wires, located on the protective layer; and
a planarization layer, located above the plurality of wires and covering a functional film layer on the flexible substrate;
wherein the protective layer corresponds to the plurality of wires in the bending area, and an orthographic projection of the plurality of wires in the bending area on the flexible substrate falls into an orthographic projection of the protective layer on the flexible substrate; and when the bending area is bent, a bending stress is released through an interface between the adjustment layer and the protective layer, to relieve a protective layer stress that the protective layer bears when the bending area is bent.

### Claim 2 (depends on 1)

The flexible display panel according to claim 1, wherein the orthographic projection of the protective layer on the flexible substrate coincides with the orthographic projection of the plurality of wires in the bending area on the flexible substrate.

### Claim 3 (depends on 1)

The flexible display panel according to claim 1, wherein a passivation layer is provided between the wires and the planarization layer, and when the bending area is bent, a passivation layer stress that the passivation layer bears is equal to the protective layer stress that the protective layer bears.

### Claim 4 (depends on 3)

The flexible display panel according to claim 3, wherein the passivation layer is selected from a group consisting of a silicon oxide passivation layer, a silicon nitride passivation layer, a silicon oxynitride passivation layer and an organic material passivation layer.

### Claim 5 (depends on 3)

The flexible display panel according to claim 3, wherein the passivation layer covers the plurality of wires in the bending area and the adjustment layer.

### Claim 6 (depends on 3)

The flexible display panel according to claim 3, wherein the passivation layer is located on the plurality of wires in the bending area and corresponds to the plurality of wires in the bending area, and an orthographic projection of the passivation layer on the flexible substrate coincides with the orthographic projection of the plurality of wires in the bending area on the flexible substrate.

### Claim 7 (depends on 1)

The flexible display panel according to claim 1, wherein the adjustment layer is an a-Si layer.

### Claim 8 (depends on 1)

The flexible display panel of claim 1, wherein a thickness of the adjustment layer is less than or equal to 1000 Å.

### Claim 9 (depends on 8)

The flexible display panel of claim 8, wherein the thickness of the adjustment layer is less than or equal to 500 Å.

### Claim 10 (depends on 1)

The flexible display panel according to claim 1, wherein the protective layer is a silicon oxide protective layer.

### Claim 11 (depends on 1)

The flexible display panel according to claim 1, wherein a thickness of the protective layer is less than or equal to 1000 Å.

### Claim 12 (depends on 11)

The flexible display panel according to claim 11, wherein the thickness of the protective layer ranges from 500 Å to 1000 Å.

### Claim 13 (depends on 1)

The flexible display panel according to claim 1, wherein there is no integral protective layer between adjacent wires in the bending area.

### Claim 14 (depends on 1)

A flexible display apparatus comprising the flexible display panel according to claim 1.

### Claim 15

A method for manufacturing a flexible display panel, comprising:
forming a flexible substrate;
forming an adjustment layer on the flexible substrate, wherein the adjustment layer covers the entire flexible substrate;
forming a protective layer on the adjustment layer;
forming wires on the protective layer; and
forming a planarization layer above the wires, wherein the planarization layer is located above wires in a bending area and covers a functional film layer on the flexible substrate;
wherein the protective layer corresponds to the wires in the bending area of the flexible display panel, and an orthographic projection of the wires in the bending area on the flexible substrate falls into an orthographic projection of the protective layer on the flexible substrate;
and, before the forming of a planarization layer above the wires, further comprising:
forming a passivation layer, wherein the passivation layer is located between the wires and the planarization layer.

### Claim 16 (depends on 15)

The method for manufacturing a flexible display panel according to claim 15, wherein the protective layer, the wires and the passivation layer are formed by following steps:
forming the protective film;
etching the protective film to form the protective layer;
forming the wires on the protective layer, wherein an orthographic projection of the wires in the bending area on the flexible substrate coincides with the orthographic projection of the protective layer on the flexible substrate; and
forming the passivation layer, wherein the passivation layer covers the wires in the bending area and the adjustment layer.

### Claim 17 (depends on 15)

The method for manufacturing a flexible display panel according to claim 15, further comprising:
forming a protective film;
forming the wires on the protective film;
forming a passivation film, wherein the passivation film covers the wires in the bending area and the protective film; and
etching the passivation film and the protective film to form the protective layer corresponding to the wires in the bending area and the passivation layer corresponding to the wires in the bending area, wherein the orthographic projections of the wires in the bending area, the protective layer and the passivation layer on the flexible substrate coincide with each other,
wherein there is no integral protective layer between adjacent wires in the bending area.

### Claim 18

A flexible display panel, comprising:
a flexible substrate;
an adjustment layer, covering the entire flexible substrate;
a protective layer, located on the adjustment layer;
a plurality of wires, located on the protective layer; and
a planarization layer, located on the wires and covering a functional film layer on the flexible substrate;
wherein the flexible display panel comprises a display area and a bending area located outside the display area, the protective layer corresponds to the wires in the bending area, and an orthographic projection of the wires in the bending area on the flexible substrate falls into an orthographic projection of the protective layer on the flexible substrate; and when the bending area is bent, a bending stress is released through an interface between the adjustment layer and the protective layer, to relieve a protective layer stress that the protective layer bears when the bending area is bent.

### Claim 19 (depends on 18)

The flexible display panel according to claim 18, wherein a thickness of the adjustment layer is less than or equal to 1000 Å.

### Claim 20 (depends on 18)

The flexible display panel according to claim 18, wherein the orthographic projection of the protective layer on the flexible substrate coincides with the orthographic projection of the wires in the bending area on the flexible substrate.