Flexible element, flexible display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11380856-B2
Application number	US-201916620897-A
Country	US
Kind code	B2
Filing date	Jan 9, 2019
Priority date	May 18, 2018
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A flexible element configured to be disposed on a surface of a non-display substrate of a flexible display panel includes: a first base layer and a second base layer which are oppositely arranged with each other; and a buffer layer sandwiched between the first base layer and the second base layer. The flexible element can be bent around a bending axis. A projection of the buffer layer on a plane perpendicular to the bending axis is wave-shaped.

First claim

The invention claimed is:

1. A flexible element configured to be disposed on a flexible display panel, the flexible element comprising:
a first base layer and a second base layer which are oppositely arranged with each other; and
at least one buffer layer sandwiched between the first base layer and the second base layer,
wherein the flexible element is capable of bending around a bending axis, and a projection of the at least one buffer layer on a plane perpendicular to the bending axis is in a wave shape,
wherein the first base layer and the second base layer respectively define a plurality of apertures therein, and
wherein a distribution density of the plurality of apertures in a bending region with a larger radius of curvature of the first base layer is greater than that in a bending region with a smaller radius of curvature of the first base layer; and the distribution density of the plurality of apertures in a bending region with a larger curvature radius of the second base layer is greater than that in the bending region with a smaller curvature radius of the second base layer.

2. The flexible element of claim 1 , further comprising:
a first fixing layer disposed between the first base layer and the at least one buffer layer; and
a second fixing layer disposed between the second base layer and the at least one buffer layer.

3. The flexible element according to claim 2 , wherein the first fixing layer and the second fixing layer are adhesive layers.

4. The flexible element according to claim 1 , wherein a material of the at least one buffer layer comprises metal.

5. The flexible element according to claim 4 , wherein the metal is selected from at least one of following materials: a shape memory alloy, a spring steel, a high-hardness stainless steel, a hardened aluminum, and an aluminum alloy.

6. The flexible element according to claim 1 , wherein the wave shape is selected from one of a zigzag or sinusoidal shape.

7. The flexible element according to claim 1 , wherein the first base layer and the second base layer are made of a flexible material with a bending recovery capability.

8. The flexible element according to claim 1 , wherein the at least one buffer layer is a plurality of buffer layers, adjacent buffer layers are separated by a spacer layer, the spacer layer and each buffer layer are adhered by an adhesive layer, and the plurality of buffer layers are different from each other at least in one of shape and size.

9. The flexible element of claim 1 , wherein an extension direction of each of the plurality of apertures is the same as a direction of the bending axis.

10. A flexible display device comprising:
at least one flexible element, each of the at least one flexible elements comprising:
a first base layer and a second base layer which are oppositely arranged with each other; and
at least one buffer layer sandwiched between the first base layer and the second base layer, wherein the flexible element is capable of bending around a bending axis, and a projection of the at least one buffer layer on a plane perpendicular to the bending axis is in a wave shape, and wherein the first base layer and the second base layer respectively define a plurality of apertures therein, and a distribution density of the plurality of apertures in a bending region with a larger radius of curvature of the first base layer is greater than that in a bending region with a smaller radius of curvature of the first base layer; and the distribution density of the plurality of apertures in a bending region with a larger curvature radius of the second base layer is greater than that in the bending region with a smaller curvature radius of the second base layer;

an adhesive layer; and
comprising a non-display substrate,
wherein the first base layer of the at least one flexible element and the non-display substrate of the flexible display panel are adhered together through the adhesive layer.

11. The flexible display device according to claim 10 , wherein the adhesive layer is a pressure sensitive adhesive.

12. The flexible display device according to claim 11 , wherein the at least one flexible element is a plurality of flexible elements, and the plurality of flexible elements are stacked and adhered to each other.

13. The flexible display device according to claim 10 , wherein the flexible element further comprises:
a first fixing layer disposed between the first base layer and the at least one buffer layer; and
a second fixing layer disposed between the second base layer and the at least one buffer layer.

14. The flexible display device according to claim 10 , wherein the flexible element is adhered to an entire back surface of the flexible display panel.

15. The flexible display device according to claim 10 , wherein the flexible element is adhered to part of a back surface of the flexible display panel.

16. The flexible display device according to claim 10 , wherein the wave shape is a zigzag or sinusoidal shape.

17. A manufacturing method of a flexible display device, comprising steps of:
providing at least one flexible element, each of the at least one flexible elements comprising:
a first base layer and a second base layer which are oppositely arranged with each other; and
at least one buffer layer sandwiched between the first base layer and the second base layer, wherein the flexible element is capable of bending around a bending axis, and a projection of the at least one buffer layer on a plane perpendicular to the bending axis is in a wave shape, and wherein the first base layer and the second base layer respectively define a plurality of apertures therein, and a distribution density of the plurality of apertures in a bending region with a larger radius of curvature of the first base layer is greater than that in a bending region with a smaller radius of curvature of the first base layer; and the distribution density of the plurality of apertures in a bending region with a larger curvature radius of the second base layer is greater than that in the bending region with a smaller curvature radius of the second base layer;

comprising a non-display substrate; and
adhering the first base layer of the at least one flexible element and the non-display substrate of the flexible display panel together through an adhesive layer to form the flexible display device.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Haoran
• Bu Dejun
• Tsai Paoming

Classifications

• H10K59/8721

  Metallic sealing arrangements · CPC title

• H10K77/111

  Flexible substrates · CPC title

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B2457/206

  Organic displays, e.g. OLED · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title