Organic light emitting diode display and method for manufacturing the same

摘要

An organic light emitting diode display panel includes a transparent substrate on which a matrix array of pixels is formed with each pixel including an organic light emitting diode (OLED). The OLEDS include light emitting regions sandwiched between pixel electrodes or anodes made of transparent conductive material and a common electrode made of a conductive material. The refractive index of the pixel electrodes is higher than the refractive index of the insulating layer on which the pixel electrodes are disposed so that light undergoes multiple reflections at the interface between the pixel electrodes and the insulating layer and also at the interface between the light emitting regions and the common electrode. The thickness of the pixel electrodes is chosen so that light that eventually exits the pixel electrodes after multiple reflections contains a relatively strong component of a chosen primary color.

主权项

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.