Patent ID: 8248551

Claim:
A semiconductor device comprising: a thin film transistor over a substrate and comprising a channel forming region, a source region and a drain region; a first insulating film over the thin film transistor; a source line over the first insulating film and electrically connected to the source region; a gate line over the substrate, the gate line comprising a portion which extends in a direction perpendicular to the source line; a drain electrode over the first insulating film and electrically connected to the drain region; a second insulating film over the drain electrode; a conductive film over the second insulating film, the conductive film extending in a direction parallel to the source line; a third insulating film over the conductive film; a pixel electrode over the third insulating film and electrically connected to the drain electrode; and a capacitor comprising the drain electrode, the second insulating film and the conductive film, wherein the conductive film comprises a first region and a second region, wherein a width of the first region of the conductive film is larger than a width of the second region of the conductive film, and wherein the first region of the conductive film overlaps with the channel forming region.