Patent ID: 8284280
Filing Date: 2012-10-09
Classification: H04N

Abstract:
1. A device for controlling an image sensor comprising an array of columns of photosensitive cells, each photosensitive cell of a same column being connected to a read column, said read column being connected to a processing circuit, at least one of the photosensitive cells comprising a photodiode capable of discharging into a sense node via a first MOS transistor, the sense node being connected to the gate of a second MOS transistor, wherein the second MOS transistor has a source directly connected to the read column without interposition of an intermediate MOS transistor, said device comprising a bias circuit adapted to increase the voltage of said read column during the discharge of the photodiode into the sense node, wherein the device is configured to change a bias of the sense node during a reset period of the sense node to a voltage level lower than a voltage level of the sense node at a start of the reset period.