Foldable display screen assembly

Patent metadata

Field	Value
Publication number	US-12550271-B2
Application number	US-202117788103-A
Country	US
Kind code	B2
Filing date	Sep 1, 2021
Priority date	Oct 26, 2020
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A foldable display screen assembly has a flat area and a curved-surface area. The foldable display screen assembly includes a flexible display module including a flat display portion and a curved-surface display portion. The flexible display module has a display surface and a back surface opposite the display surface. The foldable display screen assembly further includes a flexible support layer attached to the back surface of the flexible display module by an adhesive. The flexible support layer includes a flat support portion and a curved-surface support portion. The foldable display screen assembly further includes a rigid protective structure attached to the display surface of the flexible display module. The rigid protective structure includes a flat protective portion and a curved-surface protective portion. The elastic modulus of the rigid protective structure is greater than the elastic modulus of the flexible support layer.

First claim

What is claimed is:

1 . A foldable display screen assembly comprising:
a flat area; and a curved-surface area connected to the flat area on an edge of at least one side of the flat area; wherein the foldable display screen assembly further comprises: a flexible display module, comprising:
a flat display portion in the flat area; and
a curved-surface display portion in the curved-surface area;
wherein the curved-surface display portion is connected to the flat display portion, and the flexible display module further comprises:
a display surface; and
a back surface opposite to the display surface;
a flexible support layer, attached to the back surface of the flexible display module by an adhesive and comprising:
a flat support portion in the flat area; and
a curved-surface support portion in the curved-surface area;
wherein the curved-surface support portion is connected to the flat support portion; and
a rigid protective structure, attached to the display surface of the flexible display module and comprising:
a flat protective portion in the flat area; and
a curved-surface protective portion in the curved-surface area;
wherein the curved-surface protective portion is connected to the flat protective portion;
wherein an elastic modulus of the rigid protective structure is greater than an elastic modulus of the flexible support layer; and wherein the flat protective portion is provided with a hollowed-out structure; and/or the curved-surface protective portion is provided with a hollowed-out structure.

2 . The foldable display screen assembly according to claim 1 , wherein in the curved-surface area, an outer edge of the curved-surface protective portion exceeds an outer edge of the curved-surface display portion.

3 . The foldable display screen assembly according to claim 2 , wherein a thickness of the curved-surface protective portion is greater than a thickness of the flat protective portion.

4 . The foldable display screen assembly according to claim 3 , wherein in a direction from the flat area pointing to the curved-surface area, the thickness of the curved-surface protective portion tends to increase gradually.

5 . The foldable display screen assembly according to claim 4 , wherein:
a surface of a side, facing away from the flexible display module, of the curved-surface protective portion is flush with a surface of a side, facing away from the flexible display module, of the flat protective portion; a thickness of a part, attached to the curved-surface display portion, in the curved-surface protective portion increases gradually in the direction from the flat area pointing to the curved-surface area; and a thickness of a part, exceeding the outer edge of the curved-surface display portion, in the curved-surface protective portion is consistent.

6 . The foldable display screen assembly according to claim 1 , wherein the elastic modulus of the rigid protective structure is greater than or equal to 7.5 GPa.

7 . The foldable display screen assembly according to claim 6 , wherein a material of the rigid protective structure is:
glass, or steel, or polycarbonate, or polyethylene terephthalate.

8 . The foldable display screen assembly according to claim 1 , wherein:
the rigid protective structure is attached to a side, facing away from the flexible support layer, of the flexible display module by an adhesive layer; and an adhesive and peel strength of the adhesive layer is smaller than or equal to 100 gf.

9 . The foldable display screen assembly according to claim 8 , wherein the adhesive layer comprises:
at least two discrete adhesive portions.

10 . The foldable display screen assembly according to claim 9 , wherein:
the adhesive portions are in strip shapes; the flat area comprises:
two opposite first sides; and
two opposite second sides;
wherein the curved-surface area is connected to the first sides;
an extension direction of at least one of the adhesive portions is consistent with an extension direction of the first side; and a length of at least one of the adhesive portions is consistent with a length of the first side.

11 . The foldable display screen assembly according to claim 8 , wherein the adhesive layer is:
an ultraviolet viscosity reducing adhesive, or a double-sided adhesive, or a pressure-sensitive adhesive, or a hot-melt adhesive.

12 . The foldable display screen assembly according to claim 8 , wherein:
the flexible display module further comprises:
a display film layer; and
a flexible cover plate on a side, facing away from the flexible support layer, of the display film layer;
the foldable display screen assembly further comprises:
a protective film between the flexible display module and the rigid protective structure;
wherein the protective film covers the flat display portion and at least part of the curved-surface display portion of the flexible display module.

13 . The foldable display screen assembly according to claim 12 , wherein:
in the curved-surface area, an outer edge of the flexible cover plate exceeds an outer edge of the protective film; and/or in the curved-surface area, an outer edge of the protective film exceeds the outer edge of the adhesive layer.

14 . The foldable display screen assembly according to claim 1 , further comprising:
a bonding component; wherein one end of the bonding component is bonded with a surface, facing away from the flexible support layer, of the rigid protective structure, and another end of the bonding component is bent and bonded to a surface of a side, facing away from the rigid protective structure, of the flexible support layer.

15 . The foldable display screen assembly according to claim 8 , wherein the adhesive layer is:
set only in the flat area; or set in both the flat area and the curved-surface area.

16 . The foldable display screen assembly according to claim 15 , wherein when the adhesive layer is set in both the flat area and the curved-surface area, a viscosity of the adhesive layer in the curved-surface area is smaller than a viscosity of the adhesive layer in the flat area.

17 . A foldable display screen assembly comprising:
a flat area; and a curved-surface area connected to the flat area on an edge of at least one side of the flat area; wherein the foldable display screen assembly further comprises: a flexible display module, comprising:
a flat display portion in the flat area; and
a curved-surface display portion in the curved-surface area;
wherein the curved-surface display portion is connected to the flat display portion, and the flexible display module further comprises:
a display surface; and
a back surface opposite to the display surface;
a flexible support layer, attached to the back surface of the flexible display module by an adhesive and comprising:
a flat support portion in the flat area; and
a curved-surface support portion in the curved-surface area;
wherein the curved-surface support portion is connected to the flat support portion; and
a rigid protective structure, attached to the display surface of the flexible display module and comprising:
a flat protective portion in the flat area; and
a curved-surface protective portion in the curved-surface area;
wherein the curved-surface protective portion is connected to the flat protective portion;
wherein an elastic modulus of the rigid protective structure is greater than an elastic modulus of the flexible support layer; in the curved-surface area, an outer edge of the curved-sur

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd

Inventors

• Liu Chang
• Feng Binfeng
• Wang Chao
• Cai Yangyang
• Wang Jiaxiang
• Jiang Zhiliang
• Zhao Pan

Classifications

• G09F9/301 Primary

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title

• G06F1/1652

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• B32B7/14

  applied in spaced arrangements, e.g. in stripes · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title