The invention provides a solid state light imager or x-ray detector including an array of rows and columns of elements, each element including a photo diode, which converts photons to an electrical signal, and a transistor. Each photo diode has a capacitance associated with it. The cathode of the photo...http://www.google.co.uk/patents/US5352884?utm_source=gb-gplus-sharePatent US5352884 - Method and apparatus for providing offset for light detector
