US 11,947,117 B2
Spatially multiplexed volume Bragg gratings with varied refractive index modulations for waveguide display
Wanli Chi, Sammamish, WA (US); Dominic Meiser, Bothell, WA (US); Yang Yang, Redmond, WA (US); Wai Sze Tiffany Lam, Bothell, WA (US); Pasi Saarikko, Kirkland, 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 Oct. 7, 2021, as Appl. No. 17/496,550.
Application 17/496,550 is a division of application No. 16/840,118, filed on Apr. 3, 2020, granted, now 11,169,379.
Claims priority of provisional application 62/891,167, filed on Aug. 23, 2019.
Prior Publication US 2022/0099980 A1, Mar. 31, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 1/11 (2015.01); G02B 27/00 (2006.01); G02B 27/42 (2006.01); G02B 27/44 (2006.01); H04N 9/31 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 1/11 (2013.01); G02B 6/0016 (2013.01); G02B 6/0026 (2013.01); G02B 6/0038 (2013.01); G02B 6/005 (2013.01); G02B 27/0081 (2013.01); G02B 27/4205 (2013.01); G02B 27/44 (2013.01); H04N 9/3152 (2013.01); G02B 2027/0112 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/012 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0138 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A waveguide display comprising:
a waveguide transparent to visible light;
a first reflection volume Bragg grating (VBG) on the waveguide and characterized by a first refractive index modulation; and
a second reflection VBG on the waveguide and including a plurality of regions characterized by different respective refractive index modulations,
wherein the first reflection VBG is configured to diffract display light in a first wavelength range and a first field of view (FOV) range such that the display light in the first wavelength range and the first FOV range propagates in the waveguide through total internal reflection to the plurality of regions of the second reflection VBG;
wherein the plurality of regions of the second reflection VBG are configured to diffract the display light in different respective wavelength ranges within the first wavelength range and the first FOV range;
wherein the plurality of regions of the second reflection VBG are configured such that the display light in the first wavelength range and the first FOV range reaches a first region of the plurality of regions having a second refractive index modulation before reaching a second region of the plurality of regions having a third refractive index modulation that is greater than the second refractive index modulation; and
wherein the first region is configured to diffract the display light in a first wavelength sub-range of the first wavelength range, the second region is configured to diffract the display light in a second wavelength sub-range of the first wavelength range, and the second wavelength sub-range includes the first wavelength sub-range and is wider than the first wavelength sub-range.