US 11,927,758 B1
Multi-laser illuminated mixed waveguide display with volume Bragg grating (VBG) and mirror
Wai Sze Tiffany Lam, Lynnwood, WA (US); Wanli Chi, Sammamish, WA (US); Dominic Meiser, Bothell, WA (US); Yang Yang, Redmond, WA (US); and Ningfeng Huang, San Jose, CA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Nov. 17, 2022, as Appl. No. 17/989,159.
Claims priority of provisional application 63/401,329, filed on Aug. 26, 2022.
Int. Cl. G09G 5/00 (2006.01); F21V 8/00 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0035 (2013.01); G02B 2027/0112 (2013.01); G02B 2027/0125 (2013.01)] 17 Claims
OG exemplary drawing
 
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.