Patent ID: 8294994

Claim:
A head mounted display comprising: an optical system including: an image source to generate light for the head mounted display; first and second reflective surfaces non-parallel and opposing each other to receive the light along an optical path disposed at least partially between the first and second reflective surfaces, the first reflective surface to receive and reflect the light from the image source to the second reflective surface, the second reflective surface having a flatter curvature than the first reflective surface, wherein the first and the second reflective surfaces each comprise a partially transmissive surface to permit ambient external light to pass through the first and second reflective surfaces; and an out-coupling region included in the first reflective surface to pass light out of the first reflective surface to an eye of a user when the head mounted display is worn, the second reflective surface to receive and reflect light from the first reflective surface to the out-coupling region; and a frame assembly to support the optical system for wearing on a head of the user.