Patent ID: 6906347

Claim:
A semiconductor device comprising: a substrate; a light shielding conductive layer formed over said substrate, said light shielding conductive layer being electrically connected to a fixed potential; at least one pixel electrode formed over said substrate; at least one thin film transistor formed over said substrate for switching said pixel electrode, said thin film transistor comprising: a semiconductor layer having at least source, drain and channel regions and a capacitor forming portion, wherein said light shielding conductive layer is located below said semiconductor layer; a first insulating film on said channel region; and a gate electrode formed over said channel region with said first insulating film interposed thereetween, a storage capacitor electrically connected to said thin film transistor, said storage capacitor comprising: said capacitor forming portion of the semiconductor layer; a capacitor forming electrode formed over said capacitor forming portion; and a second insulating film interposed between aid capacitor forming portion and said capacitor forming electrode, a driver circuit including a shift register circuit comprising at least one second thin film transistor, said second thin film transistor comprising: a second semiconductor layer having at least source, drain and channel regions; a third insulating film formed on the channel region of the second semiconductor layer; and a gate electrode formed over the channel region of the second semiconductor layer with the third insulating film interposed therebetween, wherein said first insulating film is thicker than said second and third insulatig film.