A feedback-control circuit for color calibration of a diffraction light device includes at least one diffractive light device (DLD) having a gap distance defined by opposing plates, at least one sensor configured to convert light modulated by the DLD device into a light signal indicative of the gap,...http://www.google.com/patents/US7538889?utm_source=gb-gplus-sharePatent US7538889 - Calibration feedback-control circuit for diffraction light devices
