Patent ID: 7564058

Claim:
A display device comprising: a gate electrode formed on an insulating surface; a pixel electrode formed on the insulating surface; a first gate insulating layer formed over the gate electrode; a crystalline semiconductor layer formed over the first gate insulating layer; a first semiconductor layer having one conductivity type formed on the crystalline semiconductor layer; a second semiconductor layer having one conductivity type formed on the crystalline semiconductor layer; a source electrode formed on the first semiconductor layer having one conductivity type; a drain electrode formed on the second semiconductor layer having one conductivity type; a second insulating layer formed over the source electrode, the drain electrode layer, and the pixel electrode; a first opening formed in the second insulating layer to reach the source electrode or the drain electrode; a second opening formed in the first gate insulating layer and the second insulating layer to reach the pixel electrode; and a wiring layer formed in the first opening and the second opening to electrically connect the source electrode or the drain electrode to the pixel electrode, wherein the gate electrode and the pixel electrode are formed with an identical material and are formed in the same plane.