Flexible display device

1. A flexible display device comprising:

a flexible display panel;

a plurality of supports on a first outer surface of the flexible display panel, the supports being spaced apart from each other; and

an actuator on the first outer surface of the flexible display panel, the actuator being between the supports, the actuator including an electroactive polymer layer, and a first electrode layer and a second electrode layer that are respectively arranged on an upper surface and a lower surface of the electroactive polymer layer, and

the actuator having a property such that when a voltage is applied to the first electrode layer and the second electrode layer, an area of the electroactive polymer layer is changed,

the plurality of supports and the actuator being located with respect to each other on the first outer surface of the flexible display panel such that the electroactive polymer layer is contactable with side walls of the supports under a condition that the voltage is applied to the first electrode layer and the second electrode layer.

2. The flexible display device of claim 1 , wherein the plurality of supports and the actuator are located with respect to each other on the first outer surface of the flexible display panel such that an interval between two adjacent supports from among the supports is smaller than a maximum width of the electroactive polymer layer under the condition that the voltage is applied to the first electrode layer and the second electrode layer.

3. The flexible display device of claim 1 , wherein at least one of the first electrode layer and the second electrode layer is a compliant electrode.

4. The flexible display device of claim 1 , wherein the supports and the first electrode layer are adhered to the first outer surface of the flexible display panel via an adhesive layer.

5. The flexible display device of claim 4 , wherein the electroactive polymer layer has a trapezoidal vertical cross section and tapers in a direction extending from the first electrode layer toward the second electrode layer.

6. The flexible display device of claim 5 , wherein the second electrode layer is a compliant electrode.

7. The flexible display device of claim 1 , wherein:

the electroactive polymer layer includes a plurality of electroactive polymer layers arranged in a lattice pattern, and

the supports within the lattice pattern have island forms.

8. The flexible display device of claim 1 , further comprising a support film that is attached to the second electrode layer at a lower surface of the actuator and to lower surfaces of the supports.

9. The flexible display device of claim 8 , wherein the supports have trapezoidal vertical cross sections of which longer sides correspond to the lower surfaces of the supports.

10. The flexible display device of claim 9 , wherein the first electrode is a compliant electrode.

11. The flexible display device of claim 10 , wherein upper surfaces of the supports are adhered to the first outer surface of the flexible display panel via an adhesive layer.

12. The flexible display device of claim 1 , wherein the supports are parallel to each other in a stripe pattern.

13. The flexible display device of claim 1 , further comprising a switch for applying a voltage to the first electrode layer and the second electrode layer.

14. The flexible display device of claim 1 , wherein the electroactive polymer layer includes any one of a dielectric elastomer, a ferroelectric polymer, and a liquid crystal elastomer.

15. The flexible display device of claim 1 , wherein the first outer surface of the flexible display panel opposes a surface of the flexible display panel on which an image is displayed.

16. The flexible display device of claim 1 , wherein the flexible display panel is an organic light-emitting display panel.