Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is directed to the incorporation...http://www.google.com.au/patents/US7237899?utm_source=gb-gplus-sharePatent US7237899 - Highly efficient single panel and two panel projection engines
