I wonder if it is possible/new to provide the pixels of an image sensor with a time-dependent, global control voltage Vc(t) and let the pixels stop the build-up of charges on a capacitor when said control voltage is reached. This allows to stop integration at an optimal point in time, yielding for example an improved resolution of brightness values by the available voltages (balanced histogram). If desired, I can mail a more detailed pdf sketch of the idea.