Patent ID: 7279669
Filing Date: 2007-10-09
Classification: H01L,H04N

Abstract:
1. A method of detecting a photoelectric conversion amount, for detecting a photoelectric conversion amount of a photoelectric converter which comprises a thin film transistor including a photosensitive semiconductor layer, said method comprising the steps of: (1) storing a predetermined amount of charge in an auxiliary capacitance connected to a drain electrode of said thin film transistor; (2) emitting a light beam onto said photosensitive semiconductor layer for a predetermined time in a non-conductive state of said thin film transistor after the predetermined amount of charge has been stored in said auxiliary capacitance in said step (1); and (3) detecting the photoelectric conversion amount that is an amount of an optical current as converted by said photoelectric converter, based on an amount of charge remaining in said auxiliary capacitance after emitting a light beam onto said photosensitive semiconductor layer in said step (2).