Image sensor circuit

Details Image sensor circuit Image sensor circuit

H - Electricity

04

N

H04N 5/217 (2006.01)

Patent

CA 2652971

An image sensor circuit includes a CMOS image sensor with light sensitive pixels arranged in rows and columns and a readout circuitry The readout circuitry includes storage means with a CDS stage for storing signals read out from the pixels at two different time instants between two subsequent reset phases and an analogue-to-digital converter, wherein the CDS stage comprises a subtracting means for subtracting the stored signals from each other and wherein the result of the subtraction is fed to the analogue-to-digital converter (21) as a differential signal.

L'invention concerne un circuit de capteur d'image qui inclut un capteur d'image CMOS comportant des pixels sensibles à la lumière disposés en lignes et en colonnes, ainsi que des circuits de lecture. Les circuits de lecture incluent un moyen de mémorisation comportant un étage CDS permettant de mémoriser des signaux lus à partir des pixels à deux instants différents dans le temps entre deux phases successives de réinitialisation, ainsi qu'un convertisseur analogique vers numérique, l'étage CDS comprenant un moyen de soustraction permettant de soustraire les signaux mémorisés l'un de l'autre et le résultat de la soustraction étant appliqué au convertisseur analogique vers numérique (21) comme un signal différentiel.

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