Variably responsive photosensor

摘要

A photosensor includes a plurality of photosensitive regions including a first photosensitive region connected to a first voltage reference, and at least one additional photosensitive region. A signal collector is connected to the first photosensitive region. At least one switching device is for switching the at least one additional photosensitive region between the first voltage reference and a second voltage reference that is less than the first voltage reference, and for reversibly connecting the at least one additional photosensitive region to the signal collector so that the photosensor is variably responsive to different light levels.