Patent ID: 7653268

Claim:
An optical substrate guided relay, comprising: an input coupler configured to receive light from a source; an optical substrate coupled to the input coupler and configured to receive the light from the input coupler and transmit the light across the optical substrate; and an output coupler coupled to the optical substrate, configured to receive the light from the optical substrate and deliver the light away from the optical substrate guided relay with one or more partially reflective layers; a light homogenizing layer coupled to the input coupler in an offset configuration, wherein the light homogenizing layer is configured to make at least one copy of the light and to deliver the light and the at least one copy of the light to the optical substrate; and a light polarization alteration device, integral with the optical substrate guided relay, configured to convert a first polarization light to a second polarization light, wherein the light polarization alteration device is disposed between the light homogenizing layer and the input coupler.