Cover window and display device with cover window

1. A cover window for a display device including at least one curved part, wherein said at least one curved part includes an outer surface formed in an arc having a curvature radius of r1 and an inner surface formed in an arc having a curvature radius of r2, and wherein a condition of r1≦r2≦2r1 is met.

2. The cover window for a display device of claim 1 , wherein the cover window is made of a plastic material having a thermal distortion temperature in a range of 90° C. to 150° C.

3. The cover window for a display device of claim 2 , wherein the cover window includes any one selected from a group consisting of polycarbonate, cyclo olefin polymer, and polymethylmethacrylate.

4. The cover window for a display device of claim 1 , wherein the cover window has a thickness in a range of 0.4 mm to 1.0 mm.

5. The cover window for a display device of claim 1 , wherein the cover window includes a flat part, and said at least one curved part comprises a pair of curved parts, each curved part being disposed at a respective side of the flat part.

6. The cover window for a display device of claim 5 , wherein the curved parts disposed at respective sides of the flat part are formed to have a same curvature and are disposed at a side having a same curvature center.

7. The cover window for a display device of claim 1 , wherein said at least one curved part comprises a plurality of curved parts which are continuously formed along one direction of the cover window, and two adjacent curved parts of the plurality of curved parts have curvature centers disposed at sides facing each other.

8. A display device, comprising: a flexible display panel; and a cover window disposed at an outer side of a display surface of the display panel and including at least one curved part; wherein said at least one curved part includes an outer surface formed in an arc having a curvature radius of r1 and an inner surface formed in an arc having a curvature radius of r2; and wherein a condition of r1≦r2≦2r1 is met.

9. The display device of claim 8 , wherein the cover window is made of a plastic material having a thermal distortion temperature in a range of 90° C. to 150° C.

10. The display device of claim 9 , wherein the cover window includes any one selected from a group consisting of polycarbonate, cyclo olefin polymer, and polymethylmethacrylate.

11. The display device of claim 8 , wherein the cover window has a thickness in a range of 0.4 mm to 1.0 mm.

12. The display device of claim 8 , wherein the cover window includes a flat part, and said at least one curved part comprises a pair of curved parts, each curved part being disposed at a respective side of the flat part.

13. The display device of claim 12 , wherein the curved parts disposed at respective sides of the flat part are formed to have a same curvature and are disposed at a side having a same curvature center.

14. The display device of claim 8 , wherein said at least one curved part comprises a plurality of curved parts which are continuously formed along one direction of the cover window, and two adjacent curved parts of the plurality of curved parts have curvature centers disposed at sides facing each other.

15. The display device of claim 8 , further comprising a touch sensor unit and a polarizing film positioned between the display panel and the cover window.

16. The display device of claim 8 , wherein the display panel is an organic light emitting display panel including a plurality of organic light emitting diodes.