Patent ID: 8314435

Claim:
An organic light emitting diode display comprising: a plurality of subpixels that emit light of at least three colors, the plurality of subpixels each including a first electrode, an organic light emitting layer, and a second electrode, wherein each of the organic light emitting layers of at least two of the plurality of subpixels includes at least two electron transport layers, wherein the organic light emitting layer of at least one of the plurality of subpixels includes at least one electron transport layer, wherein the at least two of the plurality of subpixels includes a first electron transport layer and a second electron transport layer formed on the first electron transport layer, wherein the at least one of the plurality of subpixels is an red subpixel, a structure of an electron transport layer of the red subpixel being different from the structures of the electron transport layers of the blue and green subpixels, wherein the blue subpixel and the green subpixels includes the first electron transport layer and the second electron transport layer reflectively and the red subpixel only includes the second electron transport layer without the first electron transport layer, wherein a total thickness of each of the electron transport layers of the organic light emitting layers of the plurality of subpixels is approximately 150 Å to 400 Å, wherein a thickness of each of the first and second electron transport layers is approximately 50 Å to 300 Å, and wherein the thickness of the first electron transport layers is differ from the thickness of the second electron transport layer.