Foldable display device

1. A foldable display device comprising:

a display panel having a first surface in which a display unit is positioned and a second surface opposite to the first surface and including a bendable region; and

a panel supporting unit facing the second surface and coupled to the display panel,

wherein the panel supporting unit includes a plurality of link members arranged in parallel along a first direction by corresponding to the bendable region of the display panel in an unfolded state, each of the plurality of link members respectively having a first supporting surface corresponding to the second surface of the display panel and coupled to be rotated about two rotational axes in a folded state, and

wherein the two rotational axes of each of the plurality of link members are separated from the first supporting surface in a direction opposite from the plurality of link members, and the display panel is disposed, when coupled to the panel supporting unit, between the two rotational axes and the first supporting surface in a cross-sectional view.

2. The foldable display device of claim 1 , wherein

a plurality of first supporting surfaces included in the plurality of link members are separated from each other in the unfolded state, and

a distance between the two rotational axes of each of the plurality of link members is larger than a width of the first supporting surface.

3. The foldable display device of claim 2 , wherein

each of the plurality of link members includes two lower inclination surfaces positioned under both end parts of the first supporting surface and connected to the first supporting surface, and two first protrusion parts positioned at both end parts of the first supporting surface along a second direction crossing the first direction.

4. The foldable display device of claim 3 , wherein

each of the two first protrusion parts includes two upper inclination surfaces positioned on the same plane as the two lower inclination surfaces on a cross-section, and

the two rotational axes are positioned at an upper end part of the two upper inclination surfaces.

5. The foldable display device of claim 4 , wherein

each of the two first protrusion parts further includes two vertical surfaces positioned on the two upper inclination surfaces, and

the two vertical surfaces in the unfolded state are in contact with the vertical surfaces of the first protrusion parts of adjacent link members that are adjacent along the first direction.

6. The foldable display device of claim 4 , wherein

in the folded state, the plurality of first supporting surfaces are connected to each other, the two lower inclination surfaces are in close contact with the lower inclination surfaces of adjacent link members, and the bendable region is bent in a circular arc shape.

7. The foldable display device of claim 4 , wherein

the display panel further includes two flat regions positioned at both sides of the bendable region, and

the panel supporting unit further includes two supporting plates corresponding to the two flat regions.

8. The foldable display device of claim 7 , wherein

each of the two supporting plates includes a second supporting surface facing the display panel and two second protrusion parts positioned at both end parts of the second supporting surface along the second direction, and

the two second protrusion parts and a plurality of first protrusion parts included in the plurality of link member are mutually connected by a respective rotation coupling part having a rotational axis.

9. The foldable display device of claim 8 , wherein

in the unfolded state, the two second supporting surfaces are parallel to the plurality of first supporting surfaces, and

in the folded state, an edge of an outermost first supporting surface among the plurality of first supporting surfaces is separated from the second supporting surface toward a curvature center of the bendable region.

10. The foldable display device of claim 9 , wherein

in the folded state, the plurality of first supporting surfaces are positioned inside of an imaginary circular arc connecting the two second supporting surfaces.

11. The foldable display device of claim 8 , wherein

the two second protrusion parts are positioned to face each other outside both sides of the display panel, and

the plurality of first protrusion parts are positioned to face each other outside both sides of the display panel.

12. The foldable display device of claim 8 , wherein

the upper surface of the first protrusion part and the upper surface of the second protrusion part are separated from the first surface in the direction from the second surface toward the first surface.

13. The foldable display device of claim 4 , wherein

the plurality of first supporting surfaces respectively include a center surface and two chamfered surfaces positioned at both sides of the center surface.

14. The foldable display device of claim 13 , wherein

the two chamfered surfaces have the same width and the same chamfer angle.

15. The foldable display device of claim 8 , wherein

the panel supporting unit further includes a center supporting plate, and

the plurality of link members are positioned at both sides of the center supporting plate.

16. The foldable display device of claim 15 , wherein

the center supporting plate includes a third supporting surface facing the display panel and two third protrusion parts positioned at both end parts of the third supporting surface along the second direction, and

the two third protrusion parts and the plurality of first protrusion parts are mutually coupled by a respective rotation coupling part having the rotational axis.

17. The foldable display device of claim 16 , wherein,

in the unfolded state, the third supporting surface is parallel to the plurality of first supporting surfaces, and

in the folded state, the edge of the first supporting surface in contact with the third supporting surface among the plurality of first supporting surfaces is separated from the third supporting surface toward a curvature center of the bendable region.

18. The foldable display device of claim 17 , wherein

in the folded state, the plurality of first supporting surfaces are positioned inside an imaginary circular arc connecting the second supporting surface and the third supporting surface.

19. The foldable display device of claim 15 , wherein

each of the plurality of first supporting surfaces includes a center surface and two chamfered surfaces positioned at both sides of the center surface.

20. The foldable display device of claim 19 , wherein

the two chamfered surfaces have the same width and the same chamfer angle.

21. A foldable display device comprising:

a display panel having a first surface in which a display unit is positioned and a second surface opposite to the first surface and including a bendable region; and

a panel supporting unit facing the second surface and coupled to the display panel,

wherein the panel supporting unit includes a plurality of link members arranged in parallel along a first direction by corresponding to the bendable region of the display panel in an unfolded state, each of the plurality of link members respectively coupled to be rotated about two rotational axes in a folded state, and

wherein the two rotational axes of each of the plurality of link members are separated from the first surface in a direction opposite from the plurality of link members, and the first surface of the display panel is disposed, when coupled to the panel supporting unit, between the two rotational axes and the second surface in a cross-sectional view.

22. The foldable display device of claim 21 , wherein

the two rotational axes are positioned outside both sides of the display panel along a second direction crossing the first direction.