An output light from an light source lamp unit 8 in a projection-type display apparatus illuminates liquid-crystal light valves 925R, 925G and 925B for three colors via an integrator optical system 923. A superimposing lens 930 that is a component of the integrator optical system 923 as a uniform illumination...http://www.google.com.au/patents/USRE38084?utm_source=gb-gplus-sharePatent USRE38084 - Projector
