Patent ID: 7492402

Claim:
An image-processing device comprising: a solid-state image pickup element provided with a plurality of unit pixels, each unit pixel including a photo diode and at least one transistor for detecting an optical signal; and a circuit for changing a gate-applied voltage that changes a voltage applied to each gate of a plurality of the transistors; the circuit for changing the gate-applied voltage applying a first voltage to each gate of a plurality of the transistors in a plurality of lines from a first voltage source while in an accumulation state when carriers are generated from the photo diode in response to received light, the circuit for changing the gate-applied voltage applying a second voltage to each of the gates of the plurality of transistors in the plurality of lines while in a reset state after the accumulation state, and the circuit for changing the gate-applied voltage applying a third voltage from a second voltage source to each of the gates of the plurality of transistors in a selected one of the plurality of lines while in a reading out state when a signal in response to carriers accumulated in the accumulation state is read out after the reset state.