Patent ID: 8866984

Claim:
A liquid crystal display device comprising a pixel, the pixel comprising: a transistor; and a liquid crystal element electrically connected to the transistor, wherein the transistor comprises: a gate electrode; a first insulating layer over the gate electrode; an oxide semiconductor layer over the first insulating layer; a source terminal and a drain terminal over the oxide semiconductor layer; and a second insulating layer over the source terminal and the drain terminal, wherein the oxide semiconductor layer comprises indium, gallium, and zinc, wherein the oxide semiconductor layer is an intrinsic semiconductor or a substantially intrinsic semiconductor, wherein off current of the transistor is lower than 10 zA/μm at room temperature, wherein the oxide semiconductor layer comprises a composition represented by InMO 3 (ZnO) m , and wherein M is selected from Ga, Al, Mn, and Co, and m is larger than 0.