Patent ID: 8120039

Claim:
A semiconductor device comprising: a pixel portion over a substrate, and comprising a plurality of pixels, each comprising: a semiconductor layer comprising: a channel forming region; a source region and a drain region; a LDD region contacting the channel forming region, a first insulating film over the semiconductor layer and covering edges of the semiconductor layer; a gate electrode having a tapered portion, and provided over the first insulating film, wherein a thickness of a first portion of the first insulating film overlapped with the gate electrode is thicker than a thickness of a second portion of the first insulating film overlapping the LDD region, a second insulating film over the gate electrode; a drain wiring over the second insulating film, and electrically connected to the drain region through a contact hole in the second insulating film; and a capacitor comprising: a first wiring continuous with the gate electrode; the second insulating film over the first wiring; and the drain wiring over the second insulating film.