Patent ID: 8729544

Claim:
A semiconductor device comprising: a driver circuit comprising: a driver IC; a first transistor comprising a channel formation region comprising an oxide semiconductor including indium, wherein one of a source terminal and a drain terminal of the first transistor is electrically connected to a first terminal of the driver IC; a second transistor comprising a channel formation region comprising an oxide semiconductor including indium, wherein one of a source terminal and a drain terminal of the second transistor is electrically connected to the first terminal of the driver IC; a third transistor comprising a channel formation region comprising an oxide semiconductor including indium, wherein one of a source terminal and a drain terminal of the third transistor is electrically connected to a second terminal of the driver IC; a fourth transistor comprising a channel formation region comprising an oxide semiconductor including indium, wherein one of a source terminal and a drain terminal of the fourth transistor is electrically connected to the second terminal of the driver IC; a first wiring electrically connected to a gate of the first transistor and a gate of the third transistor; and a second wiring electrically connected to a gate of the second transistor and a gate of the fourth transistor, wherein the one of the source terminal and the drain terminal of the first transistor comprises titanium, and wherein the first transistor comprises a layer comprising titanium oxide between the channel formation region of the first transistor and the one of the source terminal and the drain terminal of the first transistor.