BLACK REFERENCE PIXEL FOR BACKSIDE ILLUMINATED IMAGE SENSOR

摘要

An imaging sensor pixel array includes a semiconductor substrate, a plurality of active pixels and at least one black reference pixel. (500) The plurality of active pixels are disposed in the semiconductor substrate (505) for capturing an image. Each of the active pixels includes a first region for receiving light including a p-n junction for accumulating an image charge and active pixel circuitry coupled to the first region to readout the image charge. The black reference pixel is also disposed within the semiconductor substrate for generating a black level reference value. The black reference pixel includes a second region (521) for receiving light without a p-n junction and black pixel circuitry (TX, RST, SF, SEL) coupled to the photodiode region (521) without the p-n junction to readout a black level reference signal.