Display Device

• US 20200135065A1
• Filed: 10/08/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: SONG, Hyunjoo
• Granted Patent: US 10,789,863 B2
• Time in Patent Office: Days
• CPC Class Codes: G09F 9/301 flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
• CPC Class Codes: H05K 1/028 Bending or folding regions of flexible printed circuits H05K1/0283 takes precedence
• CPC Class Codes: H05K 1/147 at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit H05K1/148 takes precedence
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/051 Rolled
• CPC Class Codes: H05K 2201/10128 Display
• CPC Class Codes: H05K 5/0017 with operator interface units

Abstract

A high-resolution rollable display device is disclosed. The display device includes a rollable display panel having a first side and a second side that is longer than the first side. A printed circuit board is disposed along the first side of the rollable display panel. A plurality of flexible films are connected to the printed circuit board. In one embodiment, a first end of each of the plurality of flexible films is connected to the printed circuit board at the first side of the rollable display panel and a second end of each of the plurality of flexible films is connected to the second side of the rollable display panel.

Claims

1. A rollable display device comprising:

a rollable display panel including a plurality of pixels, the rollable display panel having a first side that extends along a first direction and a second side that extends along a second direction that is different from the first direction, the second side longer than the first side;

a printed circuit board disposed along the first side of the rollable display panel; and

a plurality of flexible films each having a first end and a second end, the first end of each of the plurality of flexible films connected to the printed circuit board disposed at the first side of the rollable display panel and the second end of each of the plurality of flexible films connected to the second side of the rollable display panel.

2. The rollable display device of claim 1, wherein the rollable display panel is configured to be rolled along the second direction.

3. The rollable display device of claim 1, wherein each of the plurality of flexible films have a different length.

4. The rollable display device of claim 1, wherein the plurality of flexible films are disposed behind the rollable display panel such that the plurality of flexible films are overlapped by an active area of the rollable display panel, the active area displaying an image.

5. The rollable display device of claim 1, wherein a first portion of the plurality of flexible films extends from the first end in the second direction and a second portion of the plurality of flexible films extends diagonally from the first portion to the second end in a direction that is different from the first direction and the second direction.

6. The rollable display device of claim 1, wherein the plurality of flexible films are curved between the first end and the second end of the plurality of flexible films.

7. The rollable display device of claim 1, further comprising:

a back cover configured to overlap a rear surface of the rollable display panel, the back cover comprising;

a first portion that includes a plurality of openings, the first portion overlapping the rear surface of the rollable display panel; and

a second portion that lacks the plurality of openings, the second portion overlapping the printed circuit board without overlapping the rollable display panel.

8. The rollable display device of claim 7, wherein the plurality of flexible films are disposed between the rollable display panel and the back cover.

9. The rollable display device of claim 8, wherein the plurality of flexible films bend toward a rear surface of the rollable display panel when the rollable display device is in a rolled state.

10. The rollable display device of claim 7, wherein the plurality of openings includes a plurality of sides having different lengths and a side of the plurality of openings having a longest length is parallel to the printed circuit board and the first side of the rollable display panel.

11. The rollable display device of claim 8, further comprising:

an adhesive that adheres the rollable display panel and the plurality of flexible films to the back cover, the adhesive disposed between pairs of flexible films from the plurality of flexible films.

12. The rollable display device of claim 7, wherein the back cover is disposed between the rollable display panel and the plurality of flexible films.

13. The rollable display device of claim 12, wherein the back cover further comprises a plurality of contact openings in the first portion of the back cover, the plurality of contact openings larger than the plurality of openings,

wherein each of the plurality of flexible films contacts the rollable display panel through a corresponding one of the plurality of contact openings.

14. The rollable display device of claim 13, further comprising:

a first adhesive layer between the rollable display panel and the back cover, the first adhesive adhering together the rollable display panel and the back cover; and

a second adhesive layer between the plurality of flexible films and the back cover, the second adhesive layer adhering together the plurality of flexible films and the back cover.

15. A rollable display device comprising:

a rollable display panel including a plurality of pixels in an active area of the rollable display panel that displays an image, the rollable display panel having a first side and a second side;

a printed circuit board disposed along the first side of the rollable display panel, and

a plurality of flexible films each having a first end and a second end, the first end of each of the plurality of flexible films connected to the printed circuit board disposed at the first side of the rollable display panel and the second end of each of the plurality of flexible films connected to the second side of the rollable display panel such that the plurality of flexible films overlap the active area of the rollable display panel.

16. The rollable display device of claim 15, wherein the rollable display panel is configured to be rolled along a direction of the second side of the rollable display panel, the second side longer than the first side.

17. The rollable display device of claim 15, wherein each of the plurality of flexible films have a different length.

18. The rollable display device of claim 15, wherein a first portion of the plurality of flexible films extends from the first end in a direction parallel to the second side of the rollable display panel and a second portion of the plurality of flexible films extends diagonally from the first portion to the second end of the plurality of flexible films.

19. The rollable display device of claim 15, wherein the plurality of flexible films are curved between the first end and the second end of the plurality of flexible films.

20. The rollable display device of claim 15, further comprising:

a back cover configured to overlap a rear surface of the rollable display panel, the back cover comprising;

a first portion that includes a plurality of openings, the first portion overlapping the rollable display panel; and

a second portion that lacks the plurality of openings, the second portion overlapping the printed circuit board without overlapping the rollable display panel.

21. The rollable display device of claim 20, wherein the plurality of flexible films are disposed between the rollable display panel and the back cover.

22. The rollable display device of claim 21, wherein the plurality of flexible films bend toward a rear surface of the rollable display panel when the rollable display device is in a rolled state.

23. The rollable display device of claim 20, wherein the plurality of openings includes a plurality of sides having different lengths and a side of the plurality of openings having a longest length is parallel to the printed circuit board and the first side of the rollable display panel.

24. The rollable display device of claim 21, further comprising:

an adhesive that adheres the rollable display panel and the plurality of flexible films to the back cover, the adhesive disposed between pairs of flexible films from the plurality of flexible films.

25. The rollable display device of claim 20, wherein the back cover is disposed between the rollable display panel and the plurality of flexible films.

26. The rollable display device of claim 25, wherein the back cover further comprises a plurality of contact openings in the first portion of the back cover, the plurality of contact openings larger than the plurality of openings,

wherein each of the plurality of flexible films contacts the rollable display panel through a corresponding one of the plurality of contact openings.

27. The rollable display device of claim 26, further comprising:

a first adhesive layer between the rollable display panel and the back cover, the first adhesive adhering together the rollable display panel and the back cover; and

a second adhesive layer between the plurality of flexible films and the back cover, the second adhesive layer adhering together the plurality of flexible films and the back cover.

28. A display device, comprising:

a rollable display panel;

a plurality of flexible films electrically connected to the display panel, each of the plurality of flexible films having a different length; and

a printed circuit board electrically connected to the plurality of flexible films.

29. The display device of claim 28, further comprising:

a back cover supporting the display panel and including a plurality of openings; and

a roller unit configured to wind or unwind the display panel and the back cover,

30. The display device according to claim 28, wherein a first end and a second end of each of the plurality of flexible films are disposed on two adjacent sides of the display panel.

31. The display device according to claim 28, wherein the plurality of flexible films extend from a first side of the display panel adjacent to the printed circuit board toward a second side of the display panel.

32. The display device according to claim 29, wherein the plurality of flexible films is disposed between the display panel and the back cover.

33. The display device according to claim 29, wherein the back cover is disposed between at least a part of the plurality of flexible films and the display panel.

34. The display device according to claim 33, wherein the plurality of flexible films are bent toward a rear surface of the back cover, and

the back cover further includes contact openings exposing contact positions between the display panel and the plurality of flexible films.