Patent ID: 8519413
Filing Date: 2013-08-27
Classification: H01L

Abstract:
1. An organic light emitting diode display comprising: a substrate; a first electrode placed over the substrate, wherein the first electrode has a refractive index; an organic emissive layer placed over the first electrode, wherein the organic emissive layer comprises a red light emitting layer, a green light emitting layer, and a blue light emitting layer, which are not overlapping with each other when viewing in a direction orthogonal to a display surface of the organic light emitting diode display; a second electrode placed over the organic emissive layer; and a refractive layer disposed between the substrate and the first electrode, wherein the refractive layer has a refractive index that is greater than the refractive index of the first electrode and is between about 2.2 to about 3.0 and wherein the refractive layer comprises a first refractive sub-layer disposed between the red light emitting layer and the substrate, a second refractive sub-layer disposed between the green light emitting layer and the substrate, and a third refractive sub-layer disposed between the blue light emitting layer and the substrate, wherein the first, second, and third refractive sub-layers substantially differ in thickness from each other and wherein the first refractive sub-layer is thicker than the second refractive sub-layer, and the third refractive sub-layer is thicker than the first refractive sub-layer and the second refractive sub-layer.