Patent ID: 8610226

Claim:
A photosensor circuit comprising: a photosensor element; and an amplifier element that is connected to the photosensor element, wherein the photosensor element comprises: a gate electrode disposed on an insulating substrate; a gate insulating film disposed so as to cover the gate electrode; a semiconductor layer disposed on the gate insulating film so as to overlap the gate electrode; and a source electrode and a drain electrode provided on the semiconductor layer so as to overlap the gate electrode and so as to face each other, wherein the semiconductor layer comprises an intrinsic semiconductor layer in which a channel region is defined and an extrinsic semiconductor layer that is laminated on said intrinsic semiconductor layer such that said channel region is exposed therefrom, wherein the intrinsic semiconductor layer is an amorphous silicon layer that contains particles of nanocrystalline silicon, wherein the amplifier element comprises: an amplifier gate electrode disposed on the insulating substrate; the gate insulating film disposed so as to cover the amplifier gate electrode; an amplifier semiconductor layer disposed on the gate insulating film so as to overlap the amplifier gate electrode; and an amplifier source electrode and an amplifier drain electrode provided on the amplifier semiconductor layer so as to overlap the amplifier gate electrode and so as to face each other, wherein the amplifier semiconductor layer comprises an amplifier intrinsic semiconductor layer in which a channel region is defined and an amplifier extrinsic semiconductor layer that is laminated on said amplifier intrinsic semiconductor layer such that said channel region is exposed therefrom, and wherein the amplifier intrinsic semiconductor layer is an amorphous silicon layer that contains particles of nanocrystalline silicon.