Patent ID: 11947110
Assignee: AKONIA HOLOGRAPHICS LLC
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 20:
21. A head mounted display device comprising:
a waveguide having a substrate with a first surface and a second surface opposite the first surface and having a grating medium on the first surface of the substrate, wherein the first surface is oriented parallel to the second surface;
a prism having a first wedge of a first material mounted to the second surface of the substrate and having a second wedge of a second material different from the first material mounted to the first wedge, wherein the prism is configured to direct light through the first and second wedges and into the waveguide; and
a set of volume holograms in the grating medium and configured to diffract the light out of the waveguide, wherein the set of volume holograms are non-overlapping with respect to the prism.