| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-noise, inexpensive image sensor that can achieve wide-dynamic-range imaging. SOLUTION: The image sensor includes: a pixel part 21 including a photoelectric conversion part PD, a write transistor WT including a floating gate FG, and a readout transistor RT; a driving circuit 3 configured to erase FG electric charges of respective pixel parts 21 at the same time before resetting of PD electric charges of the respective pixel parts 21 ends, to accumulates electric charges, present in PDs right after the end of the resetting, in the FGs, to read out a dark-time signal corresponding to the accumulated electric charges, to accumulate electric charges, accumulated in the PDs during a first exposure period started after the accumulation of the electric charges, in the FGs, to read out a first signal corresponding to the accumulated electric charges, to accumulates electric charges, accumulated in the FDs during a second exposure period started after the first exposure period, in the PDs, and to read out a second signal corresponding to the accumulated electric charges; a memory 8 for storing the dark-time signal after digital conversion; and a noise removing circuit 6 which determines and outputs differences between the first signal and second signal after the digital conversion and the dark-time signal. COPYRIGHT: (C)2011,JPO&INPIT
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