Flexible display device

Patent metadata

Field	Value
Publication number	US-11688307-B2
Application number	US-202017117642-A
Country	US
Kind code	B2
Filing date	Dec 10, 2020
Priority date	Dec 27, 2019
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

Abstract

The flexible display device may include a display panel, including a display area, a non-display area and a bending area, bent in a rear direction so that one edge of the display panel has a predetermined curvature, a first back plate and a second back plate, disposed on a rear surface of the display panel, a cushion tape disposed on a rear surface of the first back plate, and a fixing tape, disposed between the cushion tape and the second back plate, made of an adhesive layer in the bending area. Accordingly, there is an effect of improving the quality of the flexible display device by reducing the peeling defect of the bending area.

First claim

What is claimed is:

1. A flexible display device, comprising:
a display panel, including a display area, a first area, and a second;
a first back plate and a second back plate, disposed on a rear surface of the display panel;
a cushion tape disposed on and contacting a rear surface of the first back plate; and
a fixing tape disposed between the cushion tape and the second back plate, the fixing tape including an adhesive layer contacting a rear surface of the cushion tape and the second back plate,
wherein an end portion of the cushion tape does not coincide with an end portion of the fixing tape and extends farther than the end portion of the fixing tape, and
wherein an end portion of the second back plate does not coincide with the end portion of the fixing tape and extends farther than the end portion of the fixing tape.

2. The flexible display device of claim 1 , further comprising a polarizing plate disposed over the display panel.

3. The flexible display device of claim 1 ,
wherein the display panel comprises:
a first flat portion;
a second flat portion facing the first flat portion; and
a curved portion, extended from the first flat portion and bent in a rear surface direction, disposed between the first flat portion and the second flat portion; and

wherein the first back plate and the second back plate are respectively disposed at rear surfaces of the first flat portion and the second flat portion.

4. The flexible display device of claim 1 , wherein the fixing tape includes a first fixing tape attached to the rear surface of the cushion tape in the first area and a second fixing tape attached to the rear surface of the cushion tape in the second area, the second fixing tape including the adhesive layer, and
wherein the first area is disposed laterally between the display area and the second area.

5. The flexible display device of claim 4 , wherein the first fixing tape and the second fixing tape are separated from each other laterally at a boundary between the first area and the second area.

6. The flexible display device of claim 4 , wherein the first fixing tape and the second fixing tape have the same thickness.

7. The flexible display device of claim 4 , wherein the first fixing tape is disposed between the cushion tape in the first area and the second back plate, and
wherein the second fixing tape is disposed between the cushion tape in the second area and the second back plate.

8. The flexible display device of claim 4 , further comprising a polarizing plate over the display panel,
wherein a lateral edge of the first fixing tape is aligned with a lateral edge of the polarizing plate.

9. The flexible display device of claim 4 ,
wherein the first fixing tape includes:
a first adhesive layer attached to the rear surface of the cushion tape;
a second adhesive layer attached to an upper surface of the second back plate; and
an electromagnetic wave absorbing layer disposed between the first adhesive layer and the second adhesive layer, and

wherein the second fixing tape is the adhesive layer contacting the rear surface of the cushion tape and the upper surface of the second back plate in the second area.

10. The flexible display device of claim 2 , further comprising a micro coating layer disposed in the second area of the display panel.

11. The flexible display device of claim 10 , wherein the micro coating layer is extended to cover a side and a portion of an upper surface of the polarizing plate.

12. The flexible display device of claim 1 , wherein the fixing tape includes:
a first adhesive layer attached to the rear surface of the cushion tape;
a second adhesive layer attached to an upper surface of the second back plate; and
an electromagnetic wave absorbing layer disposed between the first adhesive layer and the second adhesive layer.

13. The flexible display device of claim 12 , wherein the electromagnetic wave absorbing layer is disposed between the first adhesive layer and the second adhesive layer in the first area without being disposed in the second area.

14. The flexible display device of claim 1 , wherein the display panel, the first and second back plates, the cushion tape, and the fixing tape in the second area have a curvature and is bent downward.

15. The flexible display device of claim 1 , wherein the cushion tape is attached to the rear surface of the first back plate and a surface of the adhesive layer facing the rear surface of the cushion tape.

16. The flexible display device of claim 2 , wherein the polarizing plate is disposed over the display area and the first area of the display panel without being disposed over the second area of the display panel.

17. The flexible display device of claim 16 , wherein at least one of the first back plate and the second back plate is at least partially disposed in the second area of the display panel.

18. The flexible display device of claim 2 , wherein at least a portion of the adhesive layer does not overlap with the polarizing plate in a plan view.

19. The flexible display device of claim 2 , wherein at least a portion of at least one of the first back plate and the second back plate does not overlap with the polarizing plate in a plan view.

Assignees

• Lg Display Co Ltd

Inventors

• Yun Junho
• Jang Dongwon
• Baek Lokdam

Classifications

• H10K50/868

  Arrangements for polarized light emission (H10K50/86 takes precedence) · CPC title

• H10K50/8426

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

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K59/871

  Self-supporting sealing arrangements · CPC title

• G09F9/301 Primary

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