Flexible display device for vehicle

1. A flexible display device for a vehicle, comprising:

a casing having an inner space and an opening exposing the inner space;

a display unit stored at the inner space of the casing and configured to extend out from and retract into the casing through the opening;

a display driver configured to move the display unit;

a display winder configured to wind the display unit based on a movement of the display unit; and

a guide positioned within the casing and configured to guide the movement of the display unit,

wherein the guide includes a curvature guide configured to shape a moving path of the display unit to have a radius of curvature.

2. The flexible display device of claim 1 , wherein the display unit includes:

a flexible display;

a flexible connecting sheet having a first side connected to the flexible display and a second side connected to the display winder, and configured to be wound by the display winder; and

a display cover attached to a rear surface of the flexible display and the flexible connecting sheet.

3. The flexible display device of claim 2 , wherein the moving path of the display unit has a radius of curvature ranging between about 30 mm and about 70 mm.

4. The flexible display device of claim 3 , wherein the display driver includes:

a motor disposed at the casing and configured to rotate to move the display unit;

a worm gear assembly connected to the motor and having a rotation axis parallel to that of the motor; and

a worm wheel assembly connected to the worm gear assembly and having a rotation axis perpendicular to that of the motor.

5. The flexible display device of claim 4 , wherein the display driver is pivoted by the worm wheel assembly and includes a first driving arm having a first end connected to the worm wheel assembly and a second end connected to the display unit.

6. The flexible display device of claim 5 , wherein:

the display driver further includes a second driving arm having a first end connected to the second end of the first driving arm and a second end connected to the display unit, and

the first and second driving arms are configured to pivot with respect to a same plane but in mutually opposed directions, respectively.

7. The flexible display device of claim 6 , wherein:

the display unit further includes an upper fixing plate in contact with an upper end portion of a rear surface of the flexible display, and

the upper fixing plate includes a guide unit configured to guide the first or second driving arm, and a width of the upper fixing plate is equal to or greater than that of the flexible display.

8. The flexible display device of claim 4 , wherein the display winder includes:

a rotating drum configured to wind the display unit on an outer circumferential surface of the rotating drum; and

a rotation sensor configured to sense a rotation status of the rotating drum.

9. The flexible display device of claim 8 , wherein the rotating drum has a rotation spring configured to exert an elastic force in a winding direction of the display unit.

10. The flexible display device of claim 8 , wherein the rotation sensor includes:

a sensing portion configured to rotate together with the rotating drum; and

a plurality of sensors configured to sense rotation of the sensing portion.

11. The flexible display device of claim 8 , wherein an external exposure range of the display unit is controlled based on the sensed rotation status of the rotating drum.

12. The flexible display device of claim 8 , wherein the display driver is configured to control the motor based on the sensed rotation status of the rotating drum.

13. The flexible display device of claim 2 , further comprising a rear protective cover covering a rear surface of the display unit and configured to be detachable from the rear surface of the display unit.

14. The flexible display device of claim 13 , wherein each of the display cover of the display unit and the rear protective cover includes a plurality of magnets configured to detachably attach the rear protective cover to the display unit.

15. The flexible display device of claim 14 , wherein the rear protective cover is configured to be separated from the display unit when the display unit is retracted into the casing.

16. The flexible display device of claim 1 , wherein the display unit comprises a plastic organic light-emitting diode (POLED).

17. The flexible display device of claim 1 , wherein the curvature guide includes a front surface curvature guide in contact with a front surface of the display unit and a rear surface curvature guide in contact with a rear surface of the display unit.

18. The flexible display device of claim 17 , wherein each of the front and rear surface curvature guides includes a plurality of rollers.