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

Claim 13:
14. The display system of claim 8 wherein the volume holograms comprise a first volume hologram having a first grating frequency and a first grating vector, wherein the first volume hologram is configured to diffract at least some of the light coupled into the grating medium in a given direction, wherein the volume holograms comprise a second hologram overlapping the first hologram and having a second grating frequency that is different from the first grating frequency and a second grating vector non-parallel to the first grating vector, wherein the second volume hologram is configured to diffract at least some of the light coupled into the grating medium in the given direction, wherein the volume holograms comprise a third volume hologram overlapping the first and second volume holograms and having a third grating frequency that is different from the first and second grating frequencies and a third grating vector non-parallel to the first and second grating vectors, wherein the third volume hologram is configured to diffract at least some of the light coupled into the grating medium in the given direction.