Patent ID: 8455934

Claim:
An image sensor with MOS transistor based pixel matrix, organized in rows and columns, each pixel comprising: a photodiode receiving the light of the image, a transfer gate, and a charge storage zone separated from the photodiode by the transfer gate, and a reset gate adjacent to the charge storage zone for dumping to an exhaust drain the charge accumulated in this zone, wherein the charge storage zone comprises a first part and a second part distinct from the first part, the first part is adjacent to the transfer gate and not adjacent to the reset gate, the first part comprises a first region of a first type of conductivity formed in a substrate of a second type of conductivity opposite to the first, and an electrical contact on this first region, linked electrically to the gate of a readout transistor, the second part is adjacent to the reset gate and the transfer gate, the second part comprises a second region of the first type of conductivity, wherein only a portion of an upper surface of the second region is covered by a third region of the second type of conductivity linked electrically to the substrate so as to be maintained at a potential of the substrate, said first region of the first type of conductivity is not covered by a region of the second type of conductivity.