Patent ID: 8094377

Claim:
A see-through head-mounted optical apparatus for a viewer comprising at least one display module, each display module comprising: a display that is energizable to form an image; a positive field lens optically coupled to the surface of the display and disposed to direct imaged light from the display toward a first surface of a prism; and a curved reflector element in the path of the imaged light through the prism and disposed adjacent to a second surface of the prism, opposite the first surface, the curved reflector element comprising a refractive surface and a curved reflective surface that is disposed to collimate imaged light received from the display and direct the collimated imaged light toward a beam splitter that is disposed within the prism and that is at an oblique angle to the collimated reflected light; wherein the beam splitter redirects the incident collimated reflected light through the prism to form an entrance pupil for the viewer.