Display device

Patent metadata

Field	Value
Publication number	US-11749138-B2
Application number	US-202117565567-A
Country	US
Kind code	B2
Filing date	Dec 30, 2021
Priority date	Apr 29, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A display device according to an embodiment includes: a display panel; a side frame that is disposed on a rear side of the display panel and disposed on opposite edges in a first direction of the display panel; a length change member that is disposed on the rear side of the display panel and has a changing length in the first direction; a link bar that is connected to one edge of the length change member; and a guide member where a connection portion of the length change member and the link bar is disposed, wherein the other edge of the link bar is connected to the side frame, and the guide member includes a curved groove, and the connection portion of the length change member and the link bar moves in the groove.

First claim

What is claimed is:

1. A display device, comprising:
a display panel;
a side frame disposed on a rear side of the display panel and disposed on opposite edges of the display panel in a first direction;
a length change member disposed on the rear side of the display panel and having a length that changes in the first direction;
a link bar connected to one edge of the length change member; and
a guide member,
wherein a connection portion of the length change member and the link bar is disposed on the guide member,
wherein an edge of the link bar is connected to the side frame, and
the guide member comprises a curved groove, and the connection portion of the length change member and the link bar moves in the groove.

2. The display device of claim 1 , wherein
the display device is bendable in the first direction according to a length change of the length change member.

3. The display device of claim 2 , wherein
when the display device is bent in the first direction, a curved surface of the display device has a constant curvature.

4. The display device of claim 2 , wherein
when the display device is bent, a curvature radius in an entire region of the display device is constant.

5. The display device of claim 2 , wherein
when a length of the length change member is increased in the first direction, the display device is bent in the first direction, and
when the length of the length change member is decreased in the first direction, the display device is unfolded in the first direction.

6. The display device of claim 1 , wherein
a trajectory of the groove formed in the guide member has a shape that bends the display device to have a constant curvature when the connection portion of the length change member and the link bar moves within the groove.

7. The display device of claim 1 , wherein
when the display device is bent, a position P of the edge of the link bar connected to the side frame satisfies:
P ( x,y )=( R sin θ, R (1−cos θ))

wherein R denotes a curvature radius when the display device is bent, and θ denotes an angle formed by a virtual line perpendicular to a center of the display panel and a virtual line perpendicular to an end point of the display panel, and
a reference point of coordinates of P is a fixed position of the length change member.

8. The display device of claim 7 , wherein
a trajectory Q of the groove in the guide member satisfies:
Q ( x,y )= P ( x,y )−( L cos B,L sin B )=( R sin θ− L cos B,R (1−cos θ)− L sin B )

wherein
L denotes a length of the link bar, and
B denotes a value obtained by adding θ to an initial angle of the link bar in a state in which the display panel is flat.

9. The display device of claim 1 , wherein
a strength of each of the link bar and the side frame is greater than a bending strength of the display panel.

10. The display device of claim 9 , wherein
the link bar and the side frame comprise a metal.

11. The display device of claim 1 , wherein
the length change member is one of a linear motor, an air cylinder, and a gear coupled with a rotation motor.

12. The display device of claim 1 , wherein the length change member is a first length change member, and the display device further comprises:
a second length change member having a length that changes in a second direction that crosses the first direction,
wherein the display device is bendable in both the first direction and the second direction.

13. The display device of claim 1 , further comprising:
flange bearing disposed in the groove of the guide member and having a cross-section that is wider than the groove of the guide member,
wherein the flange bearing is connected to the length change member and the link bar, respectively.

14. The display device of claim 1 , wherein
the length change member simultaneously pushes the opposite edges of the display panel.

15. The display device of claim 14 , wherein
the length change member is provided in plural in a second direction that crosses the first direction.

16. The display device of claim 1 , wherein
the length change member pushes one of the opposite edges of the display panel.

17. The display device of claim 15 , wherein
the length change member is disposed in sets of two in the first direction, and
one or more sets of the length change members are disposed in the second direction that crosses the first direction.

18. A display device, comprising:
a display panel;
a side frame disposed on a rear side of the display panel and on opposite edges of the display panel in a first direction;
a length change member disposed on the rear side of the display panel and having a length that changes in a second direction that crosses the first direction;
a link bar extending in the first direction;
a connection member connecting the link bar to opposite edges of the length change member; and
a guide member,
wherein a coupling portion of the link bar and the connection member is disposed on the guide member,
an edge of the link bar is connected to the side frame, and
the guide member comprises a curved groove, and the coupling portion of the length change member and the connection member moves in the groove.

19. The display device of claim 18 , wherein
when a length of the length change member is decreased in the second direction, the display device is bent in the first direction, and
when the length of the length change member is increased in the second direction, the display device is unbent in the first direction.

20. The display device of claim 19 , wherein
when the display device is bent, a curvature radius in an entire region of the display device is constant.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Byung Jin

Classifications

• G09F9/301 Primary

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

• F16M11/02

  Heads · CPC title

• G06F1/182

  with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI] · CPC title

• F16M2200/063

  Parallelogram arms · CPC title

• F16M2200/066

  being part of the head · CPC title