Patent ID: 8354669

Claim:
An organic light-emitting display device comprising: an active layer of a thin film transistor, the active layer being on a substrate and comprising a semiconducting material; a lower electrode of a capacitor, the lower electrode being on the substrate, doped with ion impurities, and comprising a semiconducting material; a first insulating layer on the substrate to cover the active layer and the lower electrode; a gate electrode of the thin film transistor, the gate electrode being on the first insulating layer and comprising a first gate electrode comprising a metal, a second gate electrode comprising a transparent conductive material, and a third gate electrode comprising a metal, the first gate electrode, the second gate electrode, and the third gate electrode being sequentially stacked; a pixel electrode on the first insulating layer and comprising a first pixel electrode comprising a metal and a second pixel electrode comprising a transparent conductive material, the first pixel electrode and the second pixel electrode being sequentially stacked; an upper electrode of the capacitor, the upper electrode being on the first insulating layer and comprising a first upper electrode comprising a metal and a second upper electrode comprising a transparent conductive material; source and drain electrodes of the thin film transistor, the source and drain electrodes being electrically connected to the active layer; an organic layer on the pixel electrode and comprising an organic emission layer; and a counter electrode facing the pixel electrode, the organic layer intervening between the counter electrode and the pixel electrode.