Patent ID: 8803415
Filing Date: 2014-08-12
Classification: G09G,H01L,Y02E

Abstract:
1. An organic light emitting device comprising: a substrate including a first region, a second region, a third region, and a fourth region corresponding to a red pixel, a green pixel, a blue pixel, and a white pixel, respectively; a thin film transistor array disposed on the substrate and comprising a first driving transistor disposed on the first region, a second driving transistor disposed on the second region, a third driving transistor disposed on the third region and a fourth driving transistor disposed on the fourth region; an overcoat disposed on the thin film transistor; first, second, third, and fourth pixel electrodes disposed on and contacting the overcoat, the first pixel electrode being disposed on the first region, the second pixel electrode being disposed on the second region, the third pixel electrode being disposed on the third region, and the fourth pixel electrode being disposed on the fourth region; an organic light emitter disposed on the first, the second, the third, and the fourth pixel electrodes; and a common electrode disposed on the organic light emitter, wherein thicknesses of the first, the third, and the fourth pixel electrodes are substantially equal to each other and different from a thickness of the second pixel electrode, wherein the second pixel electrode comprises a lower transparent electrode and an upper transparent electrode, wherein first, second, third, and fourth contact holes, formed in the overcoat, extend to the first, the second, the third, and the fourth driving transistors, respectively, wherein the first, the third, and the fourth pixel electrodes contact the portions of the first, the third, and the fourth driving transistors through the first, the third, and the fourth contact holes, wherein the upper transparent electrode of the second pixel electrode contacts the second driving transistor through the second contact hole, and wherein the second contact hole penetrates the lower transparent electrode of the second pixel electrode.