A display apparatus includes a spatial light modulator, such as a digital micromirror device or an LCD panel, and a lighting unit that illuminates the spatial light modulator. The lighting unit may include red, green, and blue lamps which emit light that impinges on a DMD from at least two different...http://www.google.com.au/patents/US7782280?utm_source=gb-gplus-sharePatent US7782280 - Display apparatus and method
