An illumination light unit has at least one light source that generates illumination light. The unit also includes a reflecting cavity having one or more reflectors and a controlled transmission mirror disposed at an output of the reflecting cavity. The controlled transmission mirror includes an input...http://www.google.com.au/patents/US8023065?utm_source=gb-gplus-sharePatent US8023065 - Optical element for lateral light spreading in edge-lit displays and system using same
