Organic light emitting diode display

1. An organic light emitting diode display having a flat region having a flat surface, and curved regions disposed at left and right sides of the flat region and formed in curved surfaces, comprising:

a display panel including a substrate having a flat surface in the flat region, and curved surfaces in the curved regions, and organic light emitting diodes disposed on the substrate;

a window disposed on a top side of the display panel, the window comprising a flat window surface on the flat surface of the display panel and curved window surfaces on the curved surfaces of the display panel; and

a cover member disposed on a bottom side of the display panel such that the display panel is disposed between the window and the cover member,

wherein the cover member includes a flat cover member disposed in the flat region and curved cover members disposed in the curved regions, and

wherein the flat cover member is formed from a first material having a first density and at least one of the curved cover members is formed from a second material having a second density less than the first density.

2. The organic light emitting diode display of claim 1 , wherein at least one selected from the flat cover member and the curved cover members is formed of a cushion or a sponge.

3. The organic light emitting diode display of claim 1 , wherein the flat cover member and the curved cover member are formed of different materials.

4. The organic light emitting diode display of claim 2 , wherein the first density of the flat cover member is larger than the second density of the at least one of the curved cover members by about 3 times to about 10 times.

5. The organic light emitting diode display of claim 4 , wherein the flat cover member and the curved cover members have the same thickness.

6. The organic light emitting diode display of claim 1 , further comprising a touch panel disposed between the display panel and the window.

7. The organic light emitting diode display of claim 6 , wherein the touch panel is disposed in the flat region and the curved regions.

8. The organic light emitting diode display of claim 1 , wherein the curved regions extend from the flat region.

9. The organic light emitting diode display of claim 8 , wherein the flat region and the curved regions are configured to display an image.

10. An organic light emitting diode display having a flat region having a flat surface, and curved regions disposed at left and right sides of the flat region and formed in curved surfaces, comprising:

a display panel including a substrate having a flat surface in the flat region, and curved surfaces in the curved regions, and organic light emitting diodes disposed on the substrate;

a window disposed on a top side of the display panel, the window comprising a flat window surface on the flat surface of the display panel and curved window surfaces on the curved surfaces of the display panel; and

a cover member disposed on a bottom side of the display panel such that the display panel is disposed between the window and the cover member,

wherein the cover member includes a flat cover member disposed in the flat region and curved cover members disposed in the curved regions, and

wherein the flat cover member has a first thickness measured along a direction normal to the flat cover member and each of the curved cover members has a second thickness larger than the first thickness measured along a direction normal to respective ones of the curved cover members.

11. The organic light emitting diode display of claim 10 , wherein the second thickness of each of the curved cover members is larger than the first thickness of the flat cover member by about 1.5 times to about 3 times.

12. The organic light emitting diode display of claim 11 , wherein the flat cover member and the curved cover member are formed of the same material.