Patent ID: 6953951

Claim:
A semiconductor device comprising: a pixel portion comprising at least one first n-channel type thin film transistor and at least one source line, said first n-channel type thin film transistor comprising: a semiconductor layer over an insulating surface of a substrate; an insulating film over the semiconductor layer; and a gate electrode over the semiconductor layer with the insulating film interposed therebetween, wherein said source line includes a first wiring comprising a same material as the gate electrode and a first conductive film at least partly covering upper and side surfaces of the first wiring and comprising a conductive material having a lower resistivity than the gate electrode; a driver circuit over the substrate, comprising at least one second n-channel type thin film transistor and at least one p-channel type thin film transistor; and a terminal portion including a second wiring comprising the same material as the gate electrode and a second conductive film at least partly covering upper and side surfaces of the second wiring and comprising a conductive material having a lower resistivity than the gate electrode.