US Patent 12003875 Photoelectric conversion device and method of driving photoelectric conversion device

The disclosed photoelectric conversion device includes a pixel including a photoelectric conversion unit, an AD conversion unit that performs an AD conversion on an analog signal generated in the pixel, and a control unit configured to control the AD conversion unit. The control unit is configured to control the AD conversion unit to perform a plurality of times of the AD conversion on the same analog signal. A length of a first AD conversion period of the plurality of times is shorter than a length of a second AD conversion period of the plurality of times. A change rate of the reference signal in the second AD conversion period is smaller than a change rate of the reference signal in the first AD conversion period. In each of the first and second AD conversion periods, a potential of the reference signal changes to a first level.