Patent ID: 7514762

Claim:
An active matrix pixel device comprising a plurality of polycrystalline silicon islands supported by a substrate, one of the polycrystalline silicon islands providing a channel and doped source/drain regions of a thin film transistor, the active matrix pixel device further comprising a PIN diode which includes a p-type doped region and an n-type doped region separated by an amorphous silicon intrinsic region, wherein the amorphous silicon intrinsic region overlies and contacts at least a part of one of the polycrystalline silicon islands which provides one of the p-type or n-type doped regions of the PIN diode, wherein the doped source/drain regions and said one of the p-type or n-type doped regions of the PIN diode are provided by the same polycrystalline silicon island and a vertical n-i-p stack is used by using a doped region of a polysilicon thin film transistor (TFT) for the n-type doped region.