Display apparatus

1. A display apparatus comprising:

a first plate including a first display panel and a first link member, wherein the first link member includes a first internal link configured to move in a longitudinal direction of the first link member;

a second plate including a second display panel and a second link member, wherein the second link member includes a second internal link configured to move in a longitudinal direction of the second link member; and

a hinge member rotatably connecting the first link member to the second link member to thereby rotatably connect the first display panel to the second display panel,

wherein at least one of the first internal link and the second internal link includes:

a first opposing link including a first rack,

a second opposing link including a second rack facing the first rack, and

a pinion gear interlocking the first opposing link and the second opposing link.

2. The display apparatus of claim 1 , wherein the hinge member includes a first hinge connected to the first internal link, and a second hinge connected to the second internal link.

3. The display apparatus of claim 2 , wherein the first hinge and the second hinge have a common rotation axis,

wherein the first hinge includes a first connecting bar connected to the second internal link and the second hinge includes a second connecting bar connected to the first internal link, and

wherein a connection of the first connecting bar connected to the first internal link is spaced apart from the common rotation axis.

4. The display apparatus of claim 2 , wherein the first link member further includes side walls disposed on both sides of the first internal link, and

wherein the second hinge is connected to the side walls.

5. The display apparatus of claim 4 , wherein each of the side walls includes a groove, and the first hinge is movably connected to the respective grooves of the sidewalls.

6. The display apparatus of claim 4 , further comprising:

an auxiliary rail including a fixed member fixed to a side wall of the plurality of sidewalls and a moving member configured to move along the fixed member;

wherein the first internal link is connected to the moving member of the auxiliary rail.

7. The display apparatus of claim 1 , further comprising:

an arm member connected to the first link member; and

a driving source configured to move the arm member,

wherein the arm member includes:

a first arm including a first end connected to the driving source, and

a second arm including a first end rotatably connected to a second end of the first arm and a second end connected to the link member.

8. The display apparatus of claim 7 , wherein the driving source is a linear motor.

9. The display apparatus of claim 7 , wherein the arm member further includes an auxiliary arm connected to the second end of the first arm and the first end of the second arm.

10. The display apparatus of claim 1 , further comprising:

a supporting member disposed between the first link member and the second link member, and configured to support the hinge member; and

an auxiliary driving source configured to move the supporting member.

11. The display apparatus of claim 10 , wherein the auxiliary driving source is a linear motor, and

wherein the auxiliary driving source further includes a rotation bar including a first end rotatably connected to the linear motor and a second end rotatably connected to the supporting member.

12. The display apparatus of claim 1 , wherein each of the first plate and the second plate include a containing groove,

wherein the first link member and the second link member are contained in the containing grooves of the first plate and the second plate, respectively.

13. The display apparatus of claim 1 , wherein each of the first display panel and the second display panel further includes a plurality of micro LEDs.

14. The display apparatus of claim 1 , further comprising a fixed frame configured to support a rotation axis of at least one of the pinion gear of the first internal link and the pinion gear of the second internal link.

15. The display apparatus of claim 1 , wherein the first link member is configured to be substantially aligned with the second link member when the first display panel and the second display panel are adjoined.

16. The display apparatus of claim 1 , wherein the first plate and the second plate are configured to move from a folded position where the first display panel and the second display panel are separated on opposite sides of the first plate and the second plate, to an unfolded position where the first display panel and the second display panel are adjoined and aligned on a same side of the first plate and the second plate.

17. The display apparatus of claim 16 , wherein the display apparatus is configured such that when the display apparatus moves from the folded position to the unfolded position, a counter-clockwise rotation of the first link member causes the hinge member to push the first opposing links away from the hinge member to rotate the pinion gears and pull the second opposing links toward the hinge member, which causes a clockwise rotation of the second link member to thereby smoothly unfold the display apparatus.