Patent ID: 8044473

Claim:
A light sensor comprising: an intrinsic layer comprising a first light sensing region, a second light sensing region, and a channel; a first ion doping area disposed at a first side of the intrinsic layer; a second ion doping area disposed at a second side of the intrinsic layer opposite to the first side, wherein the first light sensing region adjacent to the first ion doping area and the second light sensing region disposed adjacent to the second ion doping area are used for generating electron-hole pairs in response to luminance of incident light; an oxide insulating layer disposed on the intrinsic layer, wherein the oxide insulating layer overlaps the intrinsic layer; and a metal film disposed on the oxide insulating layer, wherein the metal film is a gate, wherein an area of the metal film gate and oxide insulating layer overlapping the first light sensing region is smaller than an area of the first light sensing region which is not overlapped by the metal film gate and oxide insulating layer and wherein an area of the metal film gate and oxide insulating layer overlapping the second light sensing region is smaller than an area of the second light sensing region which is not overlapped by the metal film gate and oxide insulating layer.