Patent ID: 8743464

Claim:
An apparatus, comprising: a waveguide including an in-coupling region for receiving input light into the waveguide and an out-coupling region for emitting output light from the waveguide; a plurality of in-coupling mirrors disposed within the in-coupling region of the waveguide and orientated to reflect the input light down the waveguide towards the out-coupling region as guided light, wherein the in-coupling mirrors are laterally offset from one another within the in-coupling region to each reflect a different lateral portion of the input light while not reflecting the different lateral portions of the input light directed to other in-coupling mirrors; and a plurality of out-coupling mirrors disposed within the out-coupling region of the waveguide and orientated to reflect the guided light out of the waveguide as the output light, wherein the out-coupling mirrors each include: a first reflective surface orientated to reflect the guided light as the output light for emission from the out-coupling region; and a second reflective surface obliquely angled relative to the first reflective surface and orientated to reflect the guided light for propagation further down the out-coupling region of the waveguide, wherein the first and second reflective surfaces are reflective, non-optically transmissive surfaces, wherein the out-coupling mirrors are offset from one another such that the out-coupling region comprises a partially transparent region permitting external light to pass through the out-coupling region between the out-coupling mirrors.