Display module and display device

Patent metadata

Field	Value
Publication number	US-11925100-B2
Application number	US-202117465438-A
Country	US
Kind code	B2
Filing date	Sep 2, 2021
Priority date	Mar 10, 2021
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A display module includes substrate and adhesive portion. Substrate includes display portion, bending portion and bonding portion located on non-light-emitting side of display portion. Bending portion is located between display portion and bonding portion. Adhesive portion includes first adhesive portion including first adhesive sub-portion and second adhesive sub-portion located on side of first adhesive sub-portion facing away from bending portion. Bonding portion includes first bonding sub-portion at least partially overlapping first adhesive sub-portion in a first direction and second bonding sub-portion located on side of first bonding sub-portion facing away from bending portion at least partially overlapping second adhesive sub-portion in the first direction. In a first state, the distance between first bonding sub-portion and display portion is greater than the distance between second bonding sub-portion and display portion in first direction, thereby alleviating stress bonding portion withstands, and ensuring normal operation of display module in first state.

First claim

What is claimed is:

1. A display module, comprising:
a substrate, wherein the substrate comprises a display portion, a bending portion and a bonding portion, wherein the bending portion is located between the display portion and the bonding portion, and the bonding portion is located on a non-light-emitting side of the display portion;
wherein the display module further comprises an adhesive portion, wherein the adhesive portion is used for bonding the display portion and the bonding portion;
wherein the adhesive portion comprises a first adhesive portion, wherein the first adhesive portion comprises a first adhesive sub-portion and a second adhesive sub-portion, the second adhesive sub-portion is located at a side of the first adhesive sub-portion facing away from the bending portion;
wherein the bonding portion comprises a first bonding sub-portion and a second bonding sub-portion, wherein the second bonding sub-portion is located at a side of the first bonding sub-portion facing away from the bending portion, and the first bonding sub-portion and the first adhesive sub-portion at least partially overlap in a first direction, the second bonding sub-portion and the second adhesive sub-portion at least partially overlap in the first direction, and the first direction intersects a light-emitting surface of the display module; and
wherein in a first state, a distance between the first bonding sub-portion and the display portion is greater than a distance between the second bonding sub-portion and the display portion in the first direction.

2. The display module of claim 1 , wherein the first adhesive sub-portion comprises a pressure sensitive adhesive; and
in the first state, at least a side of the first adhesive sub-portion facing the bending portion is separated from the first bonding sub-portion.

3. The display module of claim 2 , wherein the first adhesive sub-portion comprises at least a first pressure sensitive adhesive and a second pressure sensitive adhesive, and the second pressure sensitive adhesive is located at a side of the first pressure sensitive adhesive facing away from the bending portion;
wherein a pressure sensing coefficient of the first pressure sensitive adhesive is smaller than a pressure sensing coefficient of the second pressure sensitive adhesive; and
wherein in the first state, at least the first pressure sensitive adhesive is separated from the first bonding sub-portion.

4. The display module of claim 3 , wherein a first patterned structure is provided at a side of the first pressure sensitive adhesive facing the first adhesive portion.

5. The display module of claim 4 , wherein a second patterned structure is provided at a side of the second pressure sensitive adhesive facing the first bonding sub-portion; and
wherein in a unit area, an area of a hollow portion of the first patterned structure is greater than an area of a hollow portion of the second patterned structure.

6. The display module of claim 3 , wherein a gap is provided between the first pressure sensitive adhesive and the second pressure sensitive adhesive.

7. The display module of claim 6 , wherein in a direction from the first adhesive sub-portion to the second adhesive sub-portion, an extension length L of the gap satisfies 0.05 mm≤L≤0.1 mm.

8. The display module of claim 3 , wherein the first adhesive sub-portion further comprises a third pressure sensitive adhesive, and wherein the third pressure sensitive adhesive is located at a side of the second pressure sensitive adhesive facing away from the bending portion; and
wherein a pressure sensing coefficient of the third pressure sensitive adhesive is greater than a pressure sensing coefficient of the second pressure sensitive adhesive.

9. The display module of claim 1 , wherein the first adhesive sub-portion comprises a stretchable adhesive; and
wherein in the first state, the first adhesive sub-portion is stretched by a force, and the first adhesive sub-portion adheres to the first bonding sub-portion.

10. The display module of claim 9 , wherein in the first state, a stretching length of the first adhesive sub-portion facing the bending portion is greater than a stretching length of the first adhesive sub-portion facing away from the bending portion.

11. The display module of claim 9 , wherein in response to the bending portion not being subjected to a stress, a distance between the first bonding sub-portion and the display portion is equal to a distance between the second bonding sub-portion and the display portion in the first direction, and wherein the first adhesive sub-portion adheres to the first bonding sub-portion.

12. The display module of claim 1 , wherein the first adhesive sub-portion comprises a pressure sensitive adhesive and a stretchable adhesive, and wherein the pressure sensitive adhesive is located at a side of the stretchable adhesive facing the display portion in the first direction;
wherein in a second state, the stretchable adhesive is stretched by a force, and the stretchable adhesive adheres to the pressure sensitive adhesive; and
wherein in a third state, the stretchable adhesive is separated from the pressure sensitive adhesive and a stress applied to the bending portion in the third state is greater than a stress applied to the bending portion in the second state.

13. The display module of claim 12 , wherein the pressure sensitive adhesive comprises at least a fourth pressure sensitive adhesive and a fifth pressure sensitive adhesive, and wherein the fifth pressure sensitive adhesive is located at a side of the fourth pressure sensitive adhesive facing away from the bending portion;
wherein a pressure sensing coefficient of the fourth pressure sensitive adhesive is smaller than a pressure sensing coefficient of the fifth pressure sensitive adhesive; and
wherein in the third state, at least the fourth pressure sensitive adhesive is separated from the stretchable adhesive.

14. The display module of claim 9 , wherein the stretchable adhesive comprises a silica gel or an acrylic.

15. A display device, comprising:
a display module, wherein the display module comprises a substrate, wherein the substrate comprises a display portion, a bending portion and a bonding portion, wherein the bending portion is located between the display portion and the bonding portion, and the bonding portion is located on a non-light-emitting side of the display portion;
wherein the display module further comprises an adhesive portion, wherein the adhesive portion is used for bonding the display portion and the bonding portion;
wherein the adhesive portion comprises a first adhesive portion, wherein the first adhesive portion comprises a first adhesive sub-portion and a second adhesive sub-portion, wherein the second adhesive sub-portion is located at a side of the first adhesive sub-portion facing away from the bending portion;
wherein the bonding portion comprises a first bonding sub-portion and a second bonding sub-portion, wherein the second bonding sub-portion is located at a side of the first bonding sub-portion facing away from the bending portion, and the first bonding sub-portion and the first adhesive sub-portion at least partially overlap in a first direction, wherein the second bonding sub-portion and the second adhesive sub-portion at least partially overlap in the first direction, and the first direction intersects a light-emitting surface of the display module; and
wherein in a first state, a distance between the first bonding sub-portion and the display portion is greater than a distance between the second bonding sub-portion and the display

Assignees

• Wuhan Tianma Micro Electronics Co Ltd

Inventors

• Zhao Xiangwei
• Li Jiang
• Xiao Guancheng
• Zhou Ruiyuan

Classifications

• H10K77/111 Primary

  Flexible substrates · CPC title

• B32B27/281 Primary

  comprising polyimides · CPC title

• B32B5/18

  characterised by features of a layer {of} foamed material · CPC title

• B32B7/12

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

• B32B15/046

  of foam · CPC title