Patent ID: 7592599

Claim:
A photoelectric converting apparatus comprising: an insulating supporting substrate that comprises a pixel including a photoelectric converting element, a resetting transistor having a source and a drain, wherein one of the source and the drain is connected to said photoelectric converting element and the other of the source and the drain is connected to a resetting power source, a readout transistor having a source, a drain and a gate, wherein the gate is connected to said photoelectric converting element and one of the source and the drain of said readout transistor is electrically connected to a readout power source, a signal line connected electrically to the other of the source and the drain of said readout transistor, and a constant current source connected to said signal line, wherein the resetting transistor, the readout transistor, and the constant current source are formed from an amorphous silicon layer or a polysilicon layer; and a readout unit connected to said signal line, wherein the readout unit has an amplifier connected to the signal line, and wherein said constant current source is provided on said signal line at a position on said insulating supporting substrate, spaced from said readout unit rather than said pixel, and is formed by film formations, together with at least one of said photoelectric converting element, said resetting transistor and said readout transistor.