# US 11,308,827 B2 · Flexible display device having viscoeleastic fluid layers

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- Number: US 11,308,827 B2
- Document ID: US11308827B2
- Status: Granted
- Kind: B2
- Application number: 16/344,857
- Filed: 2019-01-25
- Published: 2021-11-18
- Granted: 2022-04-19
- Earliest claimed: 2018-12-19
- Assignees: Wuhan China Star Optoelectronics Semicondutor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Mingyong Xia
- Web page: https://patentgrep.com/patent/US11308827B2

## CPC

- G02F 1/133305: {Flexible substrates, e.g. plastics, organic film}
- G09F 9/301: {flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED}
- H10K 59/87: {Passivation; Containers; Encapsulations}
- H10K 59/873: {Encapsulations}
- H10K 59/8793: {Arrangements for polarized light emission (H10K59/8791 takes precedence)}
- H10K 77/111: {Flexible substrates}
- G02F 1/133331: {Cover glasses}
- G02F 1/133528: {Polarisers}
- H10F 39/198: {Contact-type image sensors [CIS]}
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/8722: {Peripheral sealing arrangements, e.g. adhesives, sealants}
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A flexible display device is provided. The flexible display device includes a housing, a flexible display panel, a cover window, and a first viscoelastic fluid layer. The flexible display panel is disposed on the housing. The cover window is disposed on the flexible display panel. The first viscoelastic fluid layer is disposed between the cover window and the flexible display panel.

## Claims

### Claim 1

A flexible display device, comprising:
a housing;
a flexible display panel disposed on the housing;
a cover window disposed on the flexible display panel; and
a first viscoelastic fluid layer disposed between the cover window and the flexible display panel;
wherein a thickness of the first viscoelastic fluid layer is less than or equal to 25 μm; and
wherein a dispersion system of the first viscoelastic fluid layer comprises a plurality of reinforcing particles and an organic solvent, the reinforcing particles are distributed in the organic solvent, and a matrix structure of the first viscoelastic fluid layer is a fiber structure.

### Claim 2 (depends on 1)

The flexible display device according to claim 1, wherein the flexible display panel comprises a flexible substrate, an organic light emitting layer, and an encapsulation layer disposed in sequence from bottom to top, and the first viscoelastic fluid layer is disposed between the cover window and the encapsulation layer.

### Claim 3 (depends on 1)

The flexible display device according to claim 1, wherein the flexible display panel comprises a flexible substrate, an organic light emitting layer, an encapsulation layer, and a polarizer disposed in sequence from bottom to top, and the first viscoelastic fluid layer is disposed between the cover window and the polarizer.

### Claim 4 (depends on 1)

The flexible display device according to claim 1, wherein the flexible display panel comprises a flexible substrate, an organic light emitting layer, an encapsulation layer, a polarizer, and a touch layer disposed in sequence from bottom to top, and the first viscoelastic fluid layer is disposed between the cover window and the touch layer.

### Claim 5 (depends on 1)

The flexible display device according to claim 1, further comprising a hinge structure and a second viscoelastic fluid layer each disposed in the housing, wherein the hinge structure is disposed between the flexible display panel and the second viscoelastic fluid layer, the first viscoelastic fluid layer is a first non-Newtonian fluid layer, and the second viscoelastic fluid layer is a second non-Newtonian fluid layer.

### Claim 6 (depends on 5)

The flexible display device according to claim 5, wherein materials of the first non-Newtonian fluid layer and the second non-Newtonian fluid layer comprise a polymer and a plurality of reinforcing particles.

### Claim 7 (depends on 1)

The flexible display device according to claim 1, wherein a particle diameter of a single of the reinforcing particles is less than or equal to 10 μm.

### Claim 8 (depends on 1)

The flexible display device according to claim 1, wherein a ratio of the reinforcing particles to the organic solvent is 2:1.

### Claim 9

A flexible display device, comprising:
a housing;
a flexible display panel disposed on the housing;
a cover window disposed on the flexible display panel; and
a first viscoelastic fluid layer disposed between the cover window and the flexible display panel.

### Claim 10 (depends on 9)

The flexible display device according to claim 9, wherein the flexible display panel comprises a flexible substrate, an organic light emitting layer, and an encapsulation layer disposed in sequence from bottom to top, and the first viscoelastic fluid layer is disposed between the cover window and the encapsulation layer.

### Claim 11 (depends on 9)

The flexible display device according to claim 9, wherein the flexible display panel comprises a flexible substrate, an organic light emitting layer, an encapsulation layer, and a polarizer disposed in sequence from bottom to top, and the first viscoelastic fluid layer is disposed between the cover window and the polarizer.

### Claim 12 (depends on 9)

The flexible display device according to claim 9, wherein the flexible display panel comprises a flexible substrate, an organic light emitting layer, an encapsulation layer, a polarizer, and a touch layer disposed in sequence from bottom to top, and the first viscoelastic fluid layer is disposed between the cover window and the touch layer.

### Claim 13 (depends on 9)

The flexible display device according to claim 9, further comprising a hinge structure and a second viscoelastic fluid layer each disposed in the housing, wherein the hinge structure is disposed between the flexible display panel and the second viscoelastic fluid layer, the first viscoelastic fluid layer is a first non-Newtonian fluid layer, and the second viscoelastic fluid layer is a second non-Newtonian fluid layer.

### Claim 14 (depends on 13)

The flexible display device according to claim 13, wherein materials of the first non-Newtonian fluid layer and the second non-Newtonian fluid layer comprise a polymer and a plurality of reinforcing particles.

### Claim 15 (depends on 9)

The flexible display device according to claim 9, wherein a thickness of the first viscoelastic fluid layer is less than or equal to 25 μm.

### Claim 16 (depends on 9)

The flexible display device according to claim 9, wherein a dispersion system of the first viscoelastic fluid layer comprises a plurality of reinforcing particles and an organic solvent, the reinforcing particles are distributed in the organic solvent, and a matrix structure of the first viscoelastic fluid layer is a fiber structure.

### Claim 17 (depends on 16)

The flexible display device according to claim 16, wherein a particle diameter of a single of the reinforcing particles is less than or equal to 10 μm.

### Claim 18 (depends on 16)

The flexible display device according to claim 16, wherein a ratio of the reinforcing particles to the organic solvent is 2:1.