Patent ID: 8023065
Filing Date: 2011-09-20
Classification: G02F

Abstract:
1. An optical system, comprising: an image-forming panel having an illumination side and a viewing side; a light guide disposed to the illumination side of the image-forming panel; and an illumination light unit, where the light guide is optically between the illumination light unit and the image-forming panel, the illumination light unit comprising one or more light sources capable of generating illumination light and a controlled transmission mirror arranged to receive the illumination light from the one or more light sources, the controlled transmission mirror comprising an input coupling element comprising at least one of a bulk diffuser, a surface diffuser or a structured surface, an output coupling element comprising at least one of a bulk diffuser, a surface diffuser or a structured surface, and a first multilayer reflector disposed between the input and output coupling elements, the first multilayer reflector having a bandedge defined by angle θ