The transreflectors may comprise a transparent substrate having reflective surfaces and other light transmissive surfaces for respectively reflecting and transmitting a greater portion of the light striking opposite sides of the substrate. Alternatively, the transreflectors may comprise two or more transparent...http://www.google.se/patents/US7887227?utm_source=gb-gplus-sharePatent US7887227 - Transreflectors, transreflector systems and displays and methods of making transreflectors
