Photoelectric conversion device and imaging system

A photoelectric conversion device comprising:

• a plurality of pixels arranged in a matrix form and each of the plurality of pixels including
• a photoelectric conversion unit including a first electrode, a second electrode, a photoelectric conversion layer arranged between the first electrode and the second electrode, and an insulating layer arranged between the photoelectric conversion layer and the second electrode;
• an amplifier unit electrically connected to the second electrode and configured to output a signal generated in the photoelectric conversion unit;
• and
• a reset unit configured to supply a reset voltage to the second electrode, wherein
• in accordance with a voltage applied between the first electrode and the second electrode, an accumulating operation for accumulating signal charges in the photoelectric conversion unit and a removing operation for removing, from the photoelectric conversion unit, the signal charges accumulated by the accumulating operation are alternately executed,
• the reset unit executes a first reset operation for resetting a voltage of the second electrode and a second reset operation for resetting the voltage of the second electrode after the first reset operation during an accumulation period from a first removing operation in the removing operation which is executed multiple times to a second removing operation which is executed next to the first removing operation in the removing operation which is executed multiple times,
• the reset unit supplies the reset voltage to the second electrode during a period between the first reset operation and the second reset operation, and
• the period during which the reset unit supplies the reset voltage to the second electrode is longer than a horizontal scanning period adapted to read out the signals from a plurality of column circuits in turns.

An imaging system including

• a photoelectric conversion device;
• and
• a signal processing apparatus configured to process a signal from the photoelectric conversion device, wherein
• the photoelectric conversion device includes
• a plurality of pixels arranged so as to configure a plurality of columns, each of the plurality of pixels including
• a photoelectric conversion unit including a first electrode, a second electrode, a photoelectric conversion layer arranged between the first electrode and the second electrode, and an insulating layer arranged between the photoelectric conversion layer and the second electrode,
• an amplifier unit electrically connected to the second electrode and configured to output a signal generated in the photoelectric conversion unit, and
• a reset unit configured to supply a reset voltage to the second electrode;
• and
• a plurality of column circuits arranged in correspondence to the plurality of columns, each of the plurality of column circuits receiving a signal from a part of the plurality of pixels, wherein
• in accordance with a voltage applied between the first electrode and the second electrode, an accumulating operation for accumulating signal charges in the photoelectric conversion unit and a removing operation for removing the signal charges accumulated by the accumulating operation from the photoelectric conversion unit are alternately executed,
• the reset unit supplies the reset voltage to the second electrode for a period of time of at least a part of a horizontal scanning period adapted to sequentially read out the signals from the plurality of column circuits, and
• the period the reset unit supplies the reset voltage to the second electrode is longer than the horizontal scanning period.