Patent ID: 8409887

Claim:
A method of fabricating an organic light emitting diode (OLED) display device, the method comprising: forming a buffer layer on a substrate, wherein the substrate having a thin film transistor region and a capacitor region; forming an amorphous silicon layer on the buffer layer; forming a metal catalyst layer on the amorphous silicon layer; annealing the substrate to crystallize the amorphous silicon layer into a polysilicon layer; removing the metal catalyst layer; forming protrusions in the buffer layer while patterning the polysilicon layer to form a semiconductor layer in the thin film transistor region; forming a gate insulating layer on the substrate to cover the semiconductor layer; forming a gate electrode on the gate insulating layer to face a region of the semiconductor layer; forming a lower capacitor electrode on the gate insulating layer in the capacitor region; forming an interlayer insulating layer on the substrate to cover the gate electrode and the lower capacitor electrode; forming a source electrode and a drain electrode on the interlayer insulating layer, the source electrode and the drain electrode being electrically connected to the semiconductor layer; forming an upper capacitor electrode on the interlayer insulating layer to face the lower capacitor electrode; forming a first electrode on the interlayer insulating layer, the first electrode being electrically connected to one of a source region and a drain region of the semiconductor layer; forming an organic layer on the first electrode, the organic layer comprising a light emitting layer; and forming a second electrode on the organic layer.