Pixel circuit including two comparator circuits for event detection and image sensor

An image sensor comprising pixel circuits, wherein each pixel circuit comprises:

• a radiation sensitive circuit configured to convert a change of incident radiation into a pixel voltage signal VPR, wherein the pixel voltage signal VPR increases with increasing radiation intensity;
• a first capacitive element configured to receive the pixel voltage signal VPR at a first electrode;
• a second capacitive element configured to receive the pixel voltage signal VPR at a first electrode simultaneously with the first capacitive element;
• a first comparator circuit configured to compare a first resettable voltage at a second electrode of the first capacitive element with a first threshold voltage VTH;
• and
• a second comparator circuit configured to compare a second resettable voltage at a second electrode of the second capacitive element with a second threshold voltage VTL.