Patent ID: 9720227
Date: 2017-08-01
CPC Classifications: G02B,H04N

Claim:
1. A compact optics module for a head mounted display including a digital light processor (“DLP”) image source comprising: a polarized light source providing illumination light; a flat reflective polarizer to reflect the illumination light toward the DLP image source and transmit image light, wherein the illumination light is provided at an angle to the DLP; a quarter wave retarder to change the polarization state of the illumination light as it is reflected by the DLP image source thereby providing image light; at least one light trap to absorb a portion of off-state image light; a lens element to provide a viewable field of view of on-state image light in an image displayed by the DLP image source; and a combiner to reflect the on-state image light toward a user's eye and provide a see-through view of a surrounding environment; wherein the lens element includes at least one diffractive surface.