Display device including back cover disposed roller

Patent metadata

Field	Value
Publication number	US-11763701-B2
Application number	US-202017091991-A
Country	US
Kind code	B2
Filing date	Nov 6, 2020
Priority date	Nov 15, 2019
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A display device includes a display panel; a back cover supporting the display panel on a rear surface of the display panel; a roller disposed on a rear surface of the back cover, wherein the display panel and the back cover are wound around or unwound from the roller; a flexible film electrically connected to a pad area of the display panel; and a sealing layer disposed to cover an end of the flexible film. At least some of elements of the display panel including a substrate may be extended beyond the sealing layer. Accordingly, it is possible to prevent cracks in the display panel due to the pressing by the cover plate and the overflow of the sealant, thereby solving the issues of driving failure and reliability of the display panel.

First claim

What is claimed is:

1. A display device comprising:
a display panel;
a back cover supporting the display panel and disposed on a rear surface of the display panel;
a roller disposed on a rear surface of the back cover and configured to wind or unwind the display panel and the back cover;
a flexible film electrically connected to a pad area of the display panel; and
a sealing layer disposed to cover an end of the flexible film,
wherein at least one element of the display panel including a substrate is extended beyond the sealing layer.

2. The display device of claim 1 , further comprising a cover unit including a cover plate in contact with the extended at least one element on an upper surface of the display panel.

3. The display device of claim 2 , wherein the cover unit further comprises:
a base plate disposed on the rear surface of the back cover; and
a bottom plate disposed between the back cover and the cover plate.

4. The display device of claim 2 , where the display panel comprises:
a buffer layer disposed on the substrate;
a pixel portion disposed on the buffer layer;
an encapsulation layer disposed on the pixel portion;
an encapsulation substrate disposed on the encapsulation layer;
a first adhesive layer disposed under the substrate;
a barrier film disposed under the first adhesive layer;
a second adhesive layer disposed under the barrier film; and
a polarizing plate disposed under the second adhesive layer.

5. The display device of claim 4 , wherein the sealing layer is disposed on the buffer layer and surrounds side surfaces of the pixel portion, the encapsulation layer and the encapsulation substrate.

6. The display device of claim 4 , wherein the substrate, the buffer layer, the first adhesive layer, the barrier film, the second adhesive layer and the polarizing plate are extended beyond the sealing layer.

7. The display device of claim 6 , wherein ends of the substrate, the buffer layer, the first adhesive layer and the barrier film are extended more than the second adhesive layer and the polarizing plate and turn around a cushion layer once in a clockwise direction.

8. The display device of claim 7 , wherein the ends of the substrate, the buffer layer, the first adhesive layer and the barrier film turning around the cushion layer face the buffer layer.

9. The display device of claim 7 , wherein the buffer layer, the substrate, the first adhesive layer and the barrier film are disposed on the cushion layer in this order from inside toward outside, and
wherein the flexible film is in contact with the barrier film.

10. The display device of claim 7 , wherein the buffer layer, the substrate, the first adhesive layer and the barrier film are disposed under the cushion layer in this order from inside toward outside, and
wherein the second adhesive layer and the polarizing plate are disposed under the barrier film.

11. The display device of claim 4 , wherein the substrate, the buffer layer, the first adhesive layer and the barrier film are extended beyond the sealing layer.

12. The display device of claim 11 , wherein ends of the substrate, the buffer layer, the first adhesive layer and the barrier film are extended more than the second adhesive layer and the polarizing plate and turn around a cushion layer once in a counterclockwise direction.

13. The display device of claim 12 , wherein the ends of the substrate, the buffer layer, the first adhesive layer and the barrier film turning around the cushion layer face the barrier film.

14. The display device of claim 11 , wherein the barrier film, the first adhesive layer, the substrate and the buffer layer are disposed on the cushion layer in this order from inside toward outside, and
wherein the flexible film is in contact with and disposed on the buffer layer.

15. The display device of claim 11 , wherein the barrier film, the first adhesive layer, the substrate and the buffer layer are disposed under the cushion layer in this order from inside toward outside, and
wherein the cover plate is in contact with and disposed under the buffer layer.

16. The display device of claim 6 , wherein the flexible film is disposed above the buffer layer with a cushion layer therebetween.

17. The display device of claim 16 , wherein the buffer layer, the substrate, the first adhesive layer, the barrier film, the second adhesive layer and the polarizing plate are disposed under the cushion layer in this order from upper side toward lower side, and
wherein the cover plate is in contact with and disposed under the polarizing plate.

18. The display device of claim 7 , wherein the cushion layer has a streamlines shape, a circular shape, a semi-circular shape or an amorphous shape.

19. The display device of claim 2 , wherein the at least one element including the substrate is extended beyond the sealing layer to form a buffer zone, and
wherein the sealing layer is not disposed in the buffer zone where the cover plate is disposed.

20. A display device comprising:
a display panel;
a back cover supporting the display panel and disposed on a rear surface of the display panel;
a roller disposed on a rear surface of the back cover and configured to wind or unwind the display panel and the back cover;
a flexible film electrically connected to a pad area of the display panel;
a sealing layer covering an end of the flexible film, at least one element of the display panel including a substrate being extended beyond the sealing layer to form a buffer zone; and
a cover unit including a cover plate in contact with the extended at least one element of the display panel,
wherein the sealing layer is not disposed in the buffer zone where the cover plate is disposed.

Assignees

• Lg Display Co Ltd

Inventors

• Song Jihun
• Kwon Hoiyong

Classifications

• H10K59/8793

  Arrangements for polarized light emission (H10K59/8791 takes precedence) · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• G09F9/301 Primary

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

• G09F9/35

  being liquid crystals (G09F9/302 takes precedence; liquid crystal materials C09K19/00; {liquid crystal panels comprising a number of electrodes in a single cell per se G02F1/13}) · CPC title