A compact flat panel color calibration system includes a lens prism optic able to pass a narrow, perpendicular, and uniform cone angle of incoming light to a spectrally non-selective photodetector. The calibration system also includes a microprocessor operable to determine the luminance of the display...http://www.google.ca/patents/US6853387?utm_source=gb-gplus-sharePatent US6853387 - Compact flat panel color calibration system
