Organic light emitting device having triple layered pixel electrode

1. An organic light emitting device comprising:

a thin film transistor having a gate electrode and source and drain electrodes on a substrate;

a triple-layered pixel electrode having a lower pixel electrode, a reflective layer pattern, and an upper pixel electrode and connected with one of the source and drain electrodes through a via-contact hole formed in an insulating layer on the substrate;

an organic layer provided on the upper pixel electrode and having at least an emission layer; and

an opposite electrode provided on the organic layer,

wherein the lower pixel electrode is approximately 100 Å to 1000 Å thick,

wherein the upper pixel electrode is approximately 20 Å to 100 Å thick, and

wherein the lower pixel electrode is thicker than the upper pixel electrode.

2. The organic light emitting device of claim 1 , wherein the insulating layer is a stacked structure of a passivation layer and a planarization layer.

3. The organic light emitting device of claim 1 , wherein the insulating layer is a stacked structure of an inorganic insulating layer and an organic insulating layer.

4. The organic light emitting device of claim 1 , wherein the reflective layer pattern is formed of one selected from a group consisting of Ag, Pt, and Pd.

5. The organic light emitting device of claim 4 , wherein the reflective layer pattern comprises Ag.

6. The organic light emitting device of claim 1 , wherein the reflective layer pattern is approximately 500 to 3000 Å thick.

7. The organic light emitting device of claim 1 , wherein the opposite electrode is a transparent electrode.