Foldable display device

Patent metadata

Field	Value
Publication number	US-11919287-B2
Application number	US-202217864497-A
Country	US
Kind code	B2
Filing date	Jul 14, 2022
Priority date	Sep 3, 2021
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A foldable display device includes a display panel including a first non-folding area including a bending area and a non-bending area, a folding area connected to the first non-folding area, and a second non-folding area spaced apart from the first non-folding area by the folding area, an adhesive layer disposed on the non-bending area of the display panel and having a first height in a direction perpendicular to a main plane extension direction of the display panel, a polarizing layer disposed on the adhesive layer and a bending protective layer disposed on the bending area of the display panel and having a second height, in the direction, lower than the first height.

First claim

What is claimed is:

1. A foldable display device comprising:
a display panel including:
a first non-folding area including a bending area and a non-bending area;
a folding area connected to the first non-folding area; and
a second non-folding area spaced apart from the first non-folding area by the folding area,
wherein the bending area of the first non-folding area is spaced apart from the folding area;

an adhesive layer disposed on the non-bending area of the display panel and having a first height in a direction perpendicular to a main plane extension direction of the display panel;
a polarizing layer disposed on the adhesive layer; and
a bending protective layer disposed on the bending area of the display panel and having a second height, in the direction, less than the first height.

2. The foldable display device of claim 1 , wherein a modulus of the bending protective layer is greater than about 0 and less than or equal to about 860 megapascals.

3. The foldable display device of claim 2 , wherein the modulus of the bending protective layer increases from a high temperature to a low temperature.

4. The foldable display device of claim 1 , wherein a modulus of the adhesive layer is about 0.1 megapascal or less.

5. The foldable display device of claim 1 , wherein a modulus of the bending protective layer is greater than about 0 and less than or equal to about 860 megapascals, and
wherein a modulus of the adhesive layer is about 0.1 megapascal or less.

6. The foldable display device of claim 1 , wherein the bending protective layer is in contact with the adhesive layer.

7. The foldable display device of claim 1 , further comprising:
a glass disposed on the polarizing layer; and
a protective layer disposed on the glass.

8. A foldable display device comprising:
a display panel including a first non-folding area including a bending area and a non-bending area, a folding area connected to the first non-folding area, and a second non-folding area spaced apart from the first non-folding area by the folding area, wherein the bending area of the first non-folding area is spaced apart from the folding area;
an adhesive layer disposed on the non-bending area of the display panel and having a first height in a direction perpendicular to a main plane extension direction of the display panel;
a polarizing layer disposed on the adhesive layer; and
a bending protective layer disposed on the bending area of the display panel and having the first height in a first portion adjacent to the adhesive layer and having a second height, in the direction, different from the first height in a second portion spaced apart from the adhesive layer by the first portion.

9. The foldable display device of claim 8 , wherein a modulus of the bending protective layer is greater than about 0 and less than or equal to about 860 megapascals.

10. The foldable display device of claim 9 , wherein the modulus of the bending protective layer increases from a high temperature to a low temperature.

11. The foldable display device of claim 8 , wherein a modulus of the adhesive layer is about 0.1 megapascal or less.

12. The foldable display device of claim 8 , wherein a modulus of the bending protective layer is greater than about 0 and less than or equal to about 860 megapascals, and
wherein a modulus of the adhesive layer is about 0.1 megapascal or less.

13. The foldable display device of claim 8 , wherein the bending protective layer is in contact with the adhesive layer.

14. The foldable display device of claim 8 , wherein a distance between the adhesive layer and the second portion is about 50 micrometers to about 150 micrometers.

15. The foldable display device of claim 14 , wherein the second height is greater than the first height.

16. The foldable display device of claim 15 , wherein the bending protective layer gradually increases in height from the first portion to the second portion.

17. The foldable display device of claim 8 , wherein a length at which the second portion is spaced apart from the adhesive layer by the first portion is about 50 micrometers to about 150 micrometers.

18. The foldable display device of claim 8 , further comprising:
a glass disposed on the adhesive layer and protruding outward from the adhesive layer in a direction parallel to the main plane extension direction of the display panel; and
a protective layer disposed on the glass and protruding outward from the glass in the direction parallel to the main plane extension direction of the display panel.

19. The foldable display device of claim 18 , wherein the second portion overlaps the protective layer.

20. The foldable display device of claim 18 , wherein the second portion overlaps the protective layer and the glass.

21. The foldable display device of claim 18 , wherein the second portion overlaps the protective layer and does not overlap the glass.

22. A foldable display device comprising:
a display panel including:
a first non-folding area including a bending area and a non-bending area;
a folding area connected to the first non-folding area; and
a second non-folding area spaced apart from the first non-folding area by the folding area;

an adhesive layer disposed on the non-bending area of the display panel and having a first height in a direction perpendicular to a main plane extension direction of the display panel;
a polarizing layer disposed on the adhesive layer; and
a bending protective layer disposed on the non-bending area of the display panel, having the first height in a first portion adjacent to the adhesive layer, having a second height, in the direction, greater than the first height in a second portion spaced apart from the adhesive layer by the first portion, in contact with the adhesive layer and having a distance between the adhesive layer and the second portion spaced apart from each other by about 50 micrometers to about 150 micrometers.

23. The foldable display device of claim 22 , wherein a modulus of the bending protective layer is greater than about 0 and less than or equal to about 860 megapascals, and
wherein a modulus of the adhesive layer is about 0.1 megapascal or less.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Myung-Ki
• Ahn Junkeun
• Cho Yewon
• Park Dongjin

Classifications

• H10K50/844 Primary

  Encapsulations · CPC title

• B32B7/12 Primary

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

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title

• B32B2307/54

  Yield strength; Tensile strength · CPC title