Patent ID: 8482644

Claim:
A solid-state image pickup device comprising: an imaging region in which a plurality of pixels are arranged two dimensionally, each of the pixels including a plurality of photodiodes, the photodiodes of each of the pixels including a first photodiode, and a second photodiode; a signal readout section for outputting a voltage according to an amount of electric charge generated in the plurality of respective photodiodes included in each pixel of the imaging region, the signal readout section including a plurality of integrating circuits, the first photodiode being connected to a first integrating circuit of the integrating circuits via a first switch, the second photodiode being connected to a second integrating circuit of the integrating circuits via a second switch, each of the first and second integrating circuits comprising: an amplifier having input and output terminals; a capacitor provided between the input and output terminals of the first amplifier, a switch provided between the input and output terminals of the first amplifier; an A/D converting section for being input with and A/D-converting a voltage output from the signal readout section, and outputting a digital value according to the input voltage; and an adding section for operating, for each pixel of the imaging region, a sum of digital values to be output from the A/D converting section according to an amount of electric charge generated in the plurality of respective photodiodes included in the pixel, and outputting a digital value being a sum value thereof, wherein photosensitive regions of the plurality of respective photodiodes included in each pixel of the imaging region have a square shape as a whole, the pixels are arranged two dimensionally in M rows and N columns, where each of M and N is an integer no less than 2, and a total number of the first and second integrating circuits is equal to 2N.