IMAGE SENSOR, CAMERA, SURVEILLANCE SYSTEM, AND METHOD FOR DRIVING THE IMAGE SENSOR

摘要

The present invention provides an image sensor with a motion detection function. The pixel includes a photoelectric conversion element, a node that stores the potential according to the amount of charge generated in the photoelectric conversion element, a capacitive element connected in series between the photoelectric conversion element and the node, a reset circuit that resets the potential of the node, and a signal according to the potential of the node It has an amplifying circuit for outputting, and a switch for controlling electrical conduction between the amplifying circuit and the vertical signal line. The optical signal is detected by the photoelectric conversion element while the node is fixed at a constant potential. Thereafter, when the node is electrically floating, the potential of the optical signal is stored in the node in an inverted state. When the optical signal is detected while the electric potential is stored in the node, the electric potential of the node increases with the output electric potential of the photoelectric conversion element, so that the electric potential of the node corresponds to the differential electric potential of the optical signal with different light receiving periods.