Next, a method of driving the photoelectric conversion device according to the present embodiment will be described with reference to FIG. 8. Also in the present embodiment, readout of image data of the reference part 101 and image data of the comparison part 102 are performed by the readout circuit 30, and readout of image data of the reference part 103 and image data of the comparison part 104 are performed by the readout circuit 50.
FIG. 8 is a timing diagram illustrating a readout operation in the photoelectric conversion device of the present embodiment. FIG. 8 illustrates the control signal pSEL1 of the select transistor M5, the control signal pSEL2 of the select transistor M6, the control signal pRES of the reset transistor M3, and the control signal pTX2 of the transfer transistor M2 out of the control signals of the pixel P. When each of these control signals is at a high level, the corresponding transistor is in an on-state. Further, when each of these control signals is at a low level, the corresponding transistor is in an off-state.
In accordance with the control signals illustrated in FIG. 8, selection of the pixel P, reset of the floating diffusion portion FD, readout of a noise signal, transfer of charge, and readout of a light signal are performed. Further, image data is obtained by a CDS circuit (not illustrated) provided in the signal processing circuits 40 and 60 of the readout circuits 30 and 50.
