Patent ID: 7215368

Claim:
A photoelectric conversion device comprising an array of a plurality of pixels, each of which has: a plurality of photoelectric conversion units stacked in a depth direction; reset transistors of said plurality of photoelectric conversion units; floating diffusions for holding output charges from said plurality of photoelectric conversion units; amplification transistors for detecting potentials of said floating diffusions; and a plurality of read transistors, a first main electrode of each of which is connected to a charge accumulation node of each photoelectric conversion unit, and which are operated in a pentode region to read out photoelectric conversion signals from said plurality of photoelectric conversion units to said floating diffusions, wherein said plurality of photoelectric conversion units are stacked to form a three-layered structure, and the photoelectric conversion unit of a second layer accumulates a charge having a polarity different from the photoelectric conversion units other than the second layer, and the read transistor connected to the photoelectric conversion unit of the second layer has a polarity different from the read transistors connected to the photoelectric conversion units other than the second layer.