Rollable display device

1. A rollable display device, comprising:

a display module including a flexible display panel; and

a support unit disposed at a rear surface of the display module and including a bar-shaped rigid plate and a cover configured to fix the bar-shaped rigid plate to the rear surface of the display module,

wherein the bar-shaped rigid plate has a first hardness,

wherein the bar-shaped rigid plate is in close contact with and fixed to the cover having a second hardness lower than the first hardness, so that the bar-shaped rigid plate is free from the display module,

wherein the cover is attached and fixed to the rear surface of the display module through an adhesive material,

wherein a gap is formed between the bar-shaped rigid plate and the display module,

wherein the cover includes a first cover surface having a plate shape covering an outer surface of the bar-shaped rigid plate, a second cover surface protruding vertically along an edge of the first cover surface, and a third cover surface that vertically bends outwardly away from the second cover surface,

wherein the adhesive material is interposed between the third cover surface and the rear surface of the display module, and

wherein an inner storage space is defined by the first and second cover surfaces and the rear surface of the display module, and the bar-shaped rigid plate is disposed in the inner storage space.

2. The rollable display device of claim 1 , wherein the bar-shaped rigid plate has a first elongation and the cover has a second elongation larger than the first elongation.

3. The rollable display device of claim 1 , wherein the bar-shaped rigid plate has a first tensile strength and the cover has a second tensile strength lower than the first tensile strength.

4. The rollable display device of claim 1 , wherein the bar-shaped rigid plate is formed of a metal material.

5. The rollable display device of claim 1 , wherein the cover has a stretchable property and is formed of at least one of silicone resin, rubber and elastic resin.

6. The rollable display device of claim 1 , wherein a plurality of holes having a first diameter is provided in the bar-shaped rigid plate, and a plurality of fixing protrusions are provided on the first cover surface and inserted in the plurality of holes, respectively.

7. The rollable display device of claim 6 , wherein each of the plurality of fixing protrusions includes a first cylindrical protrusion having a second diameter similar to the first diameter and a second cylindrical protrusion protruding and extending outwardly from the first cylindrical protrusion to have a third diameter larger than the second diameter.

8. The rollable display device of claim 1 , wherein the bar-shaped rigid plate has a longitudinal direction along a first direction in which the display module is rolled and unrolled, and

wherein the bar-shaped rigid plate is wound around an outside of the display module when the display module is rolled, and the bar-shaped rigid plate is unwound to support the rear surface of the display module when the display module is unrolled.

9. The rollable display device of claim 8 , wherein the bar-shaped rigid plate is wound along the longitudinal direction such that a first surface is inward, and

wherein the bar-shaped rigid plate is unwound along the longitudinal direction when a second surface opposite to the first surface is curved with a curvature concave toward the first surface in a width direction.

10. The rollable display device of claim 8 , wherein the support unit includes a plurality of stiffeners, and

wherein the plurality of stiffeners have a length direction corresponding to a second direction perpendicular to the first direction and are spaced apart from each other with a predetermined distance therebetween on the rear surface of the display module along the first direction.

11. The rollable display device of claim 10 , wherein each of the plurality of stiffeners has two parts separated from each other along two longitudinal edges of the display module with respect to the bar-shaped rigid plate and the cover.

12. The rollable display device of claim 10 , wherein the bar-shaped rigid plate and the cover are disposed over the plurality of stiffeners.

13. The rollable display device of claim 1 , wherein a printed circuit board is provided at an edge of the display panel, and the printed circuit board is disposed inside the display panel when the display module is rolled.

14. The rollable display device of claim 13 , wherein an outside of the printed circuit board is surrounded by a case.

15. The rollable display device of claim 1 , wherein the display module further includes a back cover at a rear surface of the display panel.

16. A rollable display device, comprising:

a display module including a flexible display panel; and

a support unit disposed at a rear surface of the display module and including a cover attached and fixed to the display module and a bar-shaped rigid plate in close contact with and fixed to the cover,

wherein the bar-shaped rigid plate has a first hardness, and the cover has a second hardness lower than the first hardness,

wherein the cover is attached and fixed to the rear surface of the display module through an adhesive material,

wherein a gap is formed between the bar-shaped rigid plate and the display module,

wherein the cover includes a first cover surface having a plate shape covering an outer surface of the bar-shaped rigid plate, a second cover surface protruding vertically along an edge of the first cover surface, and a third cover surface that vertically bends outwardly away from the second cover surface,

wherein the adhesive material is interposed between the third cover surface and the rear surface of the display module, and

wherein an inner storage space is defined by the first and second cover surfaces and the rear surface of the display module, and the bar-shaped rigid plate is disposed in the inner storage space.

17. A rollable display device, comprising:

a display module including a flexible display panel; and

a support unit disposed at a rear surface of the display module and including a rigid plate which is attached to the display module via a flexible connecting element,

wherein the flexible connecting element is attached and fixed to the rear surface of the display module through an adhesive material,

wherein a gap is formed between the rigid plate and the display module,

wherein the flexible connecting element includes a first cover surface having a plate shape covering an outer surface of the rigid plate, a second cover surface protruding vertically along an edge of the first cover surface, and a third cover surface that vertically bends outwardly away from the second cover surface,

wherein the adhesive material is interposed between the third cover surface and the rear surface of the display module, and

wherein an inner storage space is defined by the first and second cover surfaces and the rear surface of the display module, and the rigid plate is disposed in the inner storage space.

18. The rollable display device of claim 17 , wherein the flexible connecting element includes a cover, wherein the cover is attached to the display module and the rigid plate is attached to the cover.