Patent ID: 8492768

Claim:
A semiconductor device including a display device, the display device comprising a pixel portion and a driver circuit portion, wherein the pixel portion comprises: a light shielding film over a substrate; an insulating film over the light shielding film and the substrate; a thin film transistor over the insulating film, the thin film transistor comprising: a semiconductor layer including a first channel region and a second channel region, wherein the first channel region and the second channel region are overlapped with the light shielding film; a gate insulating film over the semiconductor layer; a first gate electrode over the first channel region with the gate insulating film interposed therebetween; and a second gate electrode over the second channel region with the gate insulating film interposed therebetween; an interlayer insulating film over the first gate electrode and the second gate electrode; and a source wiring over the interlayer insulating film, the source wiring electrically connected to the semiconductor layer through an opening of the interlayer insulating film, wherein a portion of the source wiring is overlapped with the first channel region, and wherein the second channel region is not overlapped with the source wiring.