Organic light emitting diode display

1. An organic light emitting diode (OLED) display, comprising:

a substrate;

a plurality of transistors over the substrate;

a passivation layer covering the transistors; and

an OLED over the passivation layer and including a pixel electrode, an organic emission layer, and a common electrode,

wherein the pixel electrode includes a first curved portion that does not overlap the organic emission layer in the direction of light emission.

2. The OLED display of claim 1 , wherein the pixel electrode includes a metal reflective film, and wherein the common electrode includes at least one of a transparent conductive film and a translucent conductive film.

3. The OLED display of claim 2 , further comprising:

an initialization voltage line over the passivation layer and of the same material as the pixel electrode,

wherein the initialization voltage line includes a second curved portion.

4. The OLED display of claim 3 , wherein the first and second curved portions have substantially the same shape.

5. The OLED display of claim 3 , wherein the first and second curved portions have substantially the same size.

6. The OLED display of claim 3 , wherein the first and second curved portions do not directly contact each other.

7. The OLED display of claim 3 , wherein the second curved portions is not directly above the transistors.

8. The OLED display of claim 3 , wherein the first and second curved portions are concave toward the common electrode.

9. The OLED display of claim 8 , wherein the surface of the passivation layer includes a plurality of concave portions, and wherein the first and second curved portions are over the concave portions with predetermined thicknesses.

10. The OLED display of claim 3 , wherein the first and second curved portions are convex toward the common electrode.

11. The OLED display of claim 10 , wherein the surface of the passivation layer includes a plurality of convex portions, and wherein the first and second curved portions are over the convex portions with predetermined thicknesses.

12. The OLED display of claim 3 , wherein the second curved portion is at the remaining portion except for the portion overlapping the contact hole of the initialization voltage line.

13. The OLED display of claim 1 , wherein the first curved portion is not directly below the organic emission layer.

14. The OLED display of claim 1 , wherein each of the transistors includes source and drain electrodes, wherein the pixel electrode includes a non-linear portion that contacts one of the source and drain electrodes, and wherein the height of the first curved portion is similar to that of the non-linear portion.

15. The OLED display of claim 1 , wherein the passivation layer has a groove or protrusion on which the first curved portion is located.

16. An organic light emitting diode (OLED) display, comprising:

a substrate;

a plurality of transistors over the substrate;

a passivation layer covering the transistors; and

a plurality of OLEDs over the passivation layer, wherein each of the OLEDs includes a pixel electrode, an organic emission layer, and a common electrode,

wherein the pixel electrode includes at least one first curved portion that is convex or concave with respect to the common electrode, and wherein the first curved portion is between adjacent organic emission layers, and wherein the first curved portion is not directly above any of the transistors.

17. The OLED display of claim 16 , wherein the first curved portion does not overlap the organic emission layer in the depth dimension of the OLED display.

18. The OLED display of claim 16 , further comprising an initialization voltage line over the passivation layer, wherein the initialization voltage line includes at least one second curved portion that is convex or concave with respect to the common electrode.

19. The OLED display of claim 16 , wherein the passivation layer has a groove or protrusion on which the first curved portion is located.