Patent ID: 8471967

Claim:
An eyepiece for a head mounted display, the eyepiece comprising: an illumination module including an image source for launching computer generated image (“CGI”) light along a forward propagating path within the eyepiece; an end reflector disposed at an opposite end of the eyepiece from the illumination module to reflect the CGI back along a reverse propagation path; a viewing region to be aligned with an eye of a user, the viewing region disposed between the illumination module and the end reflector and including a polarizing beam splitter (“PBS”) and a non-polarizing beam splitter (“non-PBS”) disposed between the PBS and the end reflector, the viewing region to redirect the CGI light from the reverse propagation path out of an eye-ward side of the eyepiece; and a polarization rotator disposed in the forward and reverse propagation paths of the CGI light between the viewing region and the end reflector.