IMAGE SENSOR APPARATUS USING SHADED PHOTODETECTOR FOR TIME OF FLIGHT DETERMINATION

摘要

A unit pixel for an image sensor includes an accumulation circuit configured to generate an accumulated dark current by accumulating a charge corresponding to a dark current during a time of flight (TOF), the accumulation circuit being optically shaded to generate the dark current, an output voltage generation circuit configured to generate and output an output voltage corresponding to the TOF based on a charge corresponding to the accumulated dark current, a control circuit configured to control an operation of the output voltage generation circuit based on a light signal that is input to the unit pixel after being reflected by an object, the light signal being emitted by a light source, and an initialization circuit configured to initialize the accumulation circuit at a predetermined cycle.