Patent ID: 8767305
Filing Date: 2014-07-01
Classification: G02B

Abstract:
1. An eyepiece for a head mounted display, the eyepiece comprising: an illumination module for providing computer generated image (“CGI”) light along a forward propagation path within the eyepiece; a concave end reflector disposed at an opposite end of the eyepiece from the illumination module to reflect the CGI light back along a reverse propagation path within the eyepiece; a viewing region to be aligned with an eye of a user, the viewing region disposed between the illumination module and the concave end reflector and including an out-coupling polarizing beam splitter (“PBS”), the out-coupling PBS to pass the CGI light traveling along the forward propagation path and to redirect the CGI light traveling along 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 out-coupling PBS and the concave end reflector, wherein the illumination module comprises: