Patent ID: 9733475
Date: 2017-08-15
CPC Classifications: G02B

Claim:
1. A head-mounted or helmet-mounted display (HMD) for use with an image source, the HMD comprising: an asymmetric projector; and a curved substrate waveguide optically coupled to the asymmetric projector and positioned as a combiner such that light from the asymmetric projector enters the curved substrate waveguide, propagates by total internal reflection along the curved substrate waveguide in a direction substantially parallel to a single vertical axis of the curved substrate waveguide, and exits the curved substrate waveguide as collimated light toward a user, the curved substrate waveguide having an inside surface curved about the single vertical axis at a first fixed radius and an outside surface curved about the single vertical axis at a second fixed radius, wherein the single vertical axis is the axis of curvature for both the inside surface and the outside surface; and wherein the asymmetric projector is configured to pre-aberrate the light to reduce a wavefront error due to a curved shape of the curved substrate waveguide.