Patent ID: 11927758
Assignee: META PLATFORMS TECHNOLOGIES, LLC
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 7:
8. A waveguide for a head-mounted display (HMD) apparatus, comprising:
a waveguide comprising a plurality of volume Bragg gratings (VBGs), the waveguide to receive reflected display light from a display assembly and to propagate to an eye box, wherein
the display assembly comprises a projector to provide the display light associated with an image and a mirror assembly to reflect the display light from the projector,
the display light comprises two or more wavelengths for each color to provide a spectral response matching the waveguide,
the plurality of volume Bragg gratings (VBGs) comprise groups of three or more volume Bragg gratings (VBGs) having a same horizontal period, and
each group of volume Bragg gratings (VBGs) has a different angle.