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

Claim 0:
1. A head-mounted display (HMD) apparatus, comprising:
a display assembly, comprising:
a projector to provide display light associated with an image;
a mirror assembly to reflect the display light from the projector; and
a waveguide comprising a plurality of volume Bragg gratings (VBGs), the waveguide to receive the reflected display light and to propagate to an eye box, wherein
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.