Patent ID: 8334545

Claim:
A device comprising a quad pixel, the quad pixel comprising: a first OLED, a second OLED, a third OLED and a fourth OLED, each OLED independently having: a first electrode; a second electrode; an organic emissive stack having an emitting material, disposed between the first and second electrodes; a first organic stack disposed between and in contact with the first electrode and the organic emissive stack; a second organic stack disposed between and in contact with the second electrode and the organic emissive stack; wherein: the organic emissive stack of the first OLED, the organic emissive stack of the second OLED, the organic emissive stack of the third OLED, and the organic emissive stack of the fourth OLED each have different emissive spectra; the first organic stack of the first OLED, the first organic stack of the second OLED, and the first organic stack of the third OLED are different from each other in materials or thickness, or both; and the first organic stack of the third OLED and the first organic stack of the fourth OLED are the same.