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

Claim 0:
1. A display system comprising:
first and second substrates, wherein the first substrate has a first surface and a second surface opposite the first surface, the second substrate has a third surface and a fourth surface opposite the third surface, the second surface is parallel to the first surface, the third surface is parallel to the second surface, and the fourth surface is parallel to the third surface;
a grating medium contacting the second surface and the third surface;
a prism on the first substrate and configured to couple light into the grating medium through the first substrate; and
a holographic optical element in the grating medium and configured to diffract, through the second substrate, the light coupled into the grating medium by the prism, wherein the prism comprises:
a first portion that contacts the first surface of the first substrate and that comprises a first material; and
a second portion that contacts the first portion and that comprises a second material that is different from the first material.