Patent ID: 8351744

Claim:
A display device, comprising: a light source; a light modulating device; and an optical collimator configured to collimate light from the light source and provide collimated light to the light modulating device, the optical collimator comprising: an optical wedge comprising a thin end comprising a first light interface; a thick end opposite the thin end; a viewing surface comprising a second light interface extending at least partially between the thin end and the thick end and having a first critical angle of internal reflection with respect to a normal of the viewing surface; a back surface opposing the viewing surface; and a collimating end reflector arranged at the thick end of the optical wedge, wherein the collimating end reflector comprises a faceted lens structure comprising a plurality of facets arranged at an angle relative to a surface of the thick end, the plurality of facets alternating between facets facing the viewing surface and facets facing the back surface.