Patent ID: 7907224

Claim:
An image display device, comprising: a substantially transparent substrate; a color filter layer formed on the substantially transparent substrate; and a substantially transparent semiconductor circuit formed on the color filter layer, comprising: a substantially transparent thin film transistor, comprising: a source electrode; a drain electrode; a gate insulating film; a gate electrode; and a semiconductor active layer comprised of an amorphous zinc gallium indium oxide, the semiconductor active layer having a thickness of 15 nm-35 nm, the amorphous zinc gallium indium oxide having electron carrier concentration being equal to or less than 10 18 /cm 3 ; and a wiring made of a substantially transparent conductive material, the wiring having a electric contact point with the substantially transparent thin film transistor, wherein the substantially transparent semiconductor circuit has on/off ratio of 3×10 7 -6×10 7 in a light irradiation state.