Patent ID: 8760765

Claim:
An eyepiece for a head mounted display, the eyepiece comprising: a display module for providing display light along a forward propagation path within the eyepiece; an end reflector disposed at an opposite end of the eyepiece from the display module to reflect the display light back along a reverse propagation path within the eyepiece; and a viewing region to be aligned with an eye of a user, the viewing region disposed between the display module and the end reflector and including a partially reflective surface, the partially reflective surface to pass the display light traveling along the forward propagation path and to redirect the display light traveling along the reverse propagation path out of an eye-ward side of the eyepiece along an emission path, wherein the partially reflective surface has a compound folding angle such that the emission path of the display light emitted from the eyepiece is folded along two axes relative to the reverse propagation path between the end reflector and the partially reflective surface.