# US 12,016,139 B2 · Flexible display device and manufacturing method thereof

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- Number: US 12,016,139 B2
- Document ID: US12016139B2
- Status: Granted
- Kind: B2
- Application number: 17/419,743
- Filed: 2021-04-02
- Published: 2023-05-18
- Granted: 2024-06-18
- Earliest claimed: 2021-03-15
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Lijun Qin; Yanqiang Duan
- Web page: https://patentgrep.com/patent/US12016139B2

## CPC

- H05K 5/02: Details
- H10K 77/111: {Flexible substrates}
- G06F 1/1601: {Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays (constructional details related to flat displays integrated in a portable computer, e.g. laptop, handheld computer G06F1/1637; constructional details related to television receivers H04N5/64)}
- G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A flexible display device and a manufacturing method thereof are provided. The flexible display device includes a flexible display panel, wherein the flexible display panel is bent at a preset position to form a first plane part, a bending part, and a second plane part, the preset position includes a first bending point and a second bending point, a distance between the first bending point and the second bending point is H, a middle point of a line formed by connecting the first bending point and the second bending point is located on a bending axis of the bending part, and a radius of curvature of at least one point on the bending part is greater than H/2.

## Claims

### Claim 1

A flexible display device, comprising:
a backplate;
a flexible display panel, wherein the flexible display panel is bent at a preset position to form a first plane part, a bending part, and a second plane part, and the bending part is located between the first plane part and the second plane part;
wherein the preset position comprises a first bending point located on a surface where the bending part meets the first plane part and a second bending point located on a surface where the bending part meets the second plane part, the first plane part lies on a first plane, and the first bending point and the second bending point lie on a second plane perpendicular to the first plane; and
wherein a distance between the first bending point and the second bending point is H, and on the second plane, a radius of curvature of the bending part is greater than H/2,
wherein the flexible display panel is disposed on the backplate, a first backplate is disposed on the backplate corresponding to the first plane part, the first plane part is located on the first backplate, a groove part is defined on the backplate corresponding to the bending part, the bending part is disposed corresponding to the groove part, a second backplate is disposed on the backplate corresponding to the second plane part, and the second plane part is located on the second backplate;
wherein the second plane part is bent to one side of the first backplate towards the first plane part, and a design h L of the groove part before bending satisfies a following formula:
L=απ(H−h)/2;
wherein α is a bending process accuracy corrected value, H is a distance between the first bending point and the second bending point, and h is a thickness of the flexible display panel.

### Claim 2 (depends on 1)

The flexible display device as claimed in claim 1, wherein the second plane part is parallel to the first plane; and
wherein on the second plane, a distance between a curved-surface vertex of the bending part and the first plane part is equal to a distance between the curved-surface vertex and the second plane part.

### Claim 3 (depends on 2)

The flexible display device as claimed in claim 2, wherein a difference between a longest radius of curvature r of the bending part and a shortest radius of curvature H/2 is at least greater than 120 μm.

### Claim 4 (depends on 3)

The flexible display device as claimed in claim 3, wherein the difference between the longest radius of curvature r of the bending part and the shortest radius of curvature H/2 is at least greater than 200 μm.

### Claim 5 (depends on 2)

The flexible display device as claimed in claim 2, wherein a bending axis of the bending part is perpendicular to the second plane, a middle point of a line formed by connecting the first bending point and the second bending point is located on the bending axis, and an angle between a plane formed by the curved-surface vertex and the bending axis and the first plane part ranges from 0 degrees to 30 degrees.

### Claim 6 (depends on 1)

The flexible display device as claimed in claim 1, wherein an angle between a plane formed by a curved-surface vertex of the bending part on the second plane and a bending axis of the bending part and the first plane part and/or the second plane part ranges from 0 degrees to 30 degrees.

### Claim 7 (depends on 1)

The flexible display device as claimed in claim 1, comprising a composite supporting structure, wherein the composite supporting structure is located between the first plane part and the second plane part after bending, the composite supporting structure separately abuts the first backplate and the second backplate, and the distance H between the first bending point and the second bending point satisfies a following formula:
H=2(h+a)+b
wherein h is a thickness of the flexible display panel, a is a thickness of the backplate, and b is a thickness of the composite supporting structure.

### Claim 8 (depends on 1)

The flexible display device as claimed in claim 1, wherein a shape of the bending part comprises an elliptical curved surface.

### Claim 9 (depends on 1)

The flexible display device as claimed in claim 1, wherein on the second plane, the bending part has a curved-surface vertex, the radius of curvature of the bending part gradually increases in an interval from the first bending point to the curved-surface vertex, and the radius of curvature of the bending part gradually decreases in an interval from the curved-surface vertex to the second bending point.

### Claim 10 (depends on 1)

The flexible display device as claimed in claim 1, wherein on the second plane, the radius of curvature of the bending part varies between a shortest radius of curvature H/2 and a longest radius of curvature r.