US 11,885,967 B2
Phase structure on volume Bragg grating-based waveguide display
Wai Sze Tiffany Lam, Bothell, WA (US); Yang Yang, Redmond, WA (US); Wanli Chi, Sammamish, WA (US); and Dominic Meiser, Bothell, WA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Sep. 17, 2021, as Appl. No. 17/478,679.
Claims priority of provisional application 63/110,241, filed on Nov. 5, 2020.
Prior Publication US 2022/0137411 A1, May 5, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 27/28 (2006.01); G02B 5/30 (2006.01); F21V 8/00 (2006.01); G02B 5/18 (2006.01); G02B 6/34 (2006.01); G02B 27/00 (2006.01); G02B 27/09 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/1833 (2013.01); G02B 5/1842 (2013.01); G02B 5/3083 (2013.01); G02B 6/005 (2013.01); G02B 6/0026 (2013.01); G02B 6/34 (2013.01); G02B 27/0081 (2013.01); G02B 27/0093 (2013.01); G02B 27/0944 (2013.01); G02B 27/286 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A waveguide display comprising:
a first substrate transparent to visible light;
a second substrate transparent to the visible light;
a holographic material layer sandwiched by the first substrate and the second substrate and including a reflective volume Bragg grating characterized by a polarization-dependent diffraction efficiency, the reflective volume Bragg grating configured to more preferentially reflectively diffract incident light of a first polarization state over incident light of a second polarization state that is orthogonal to the first polarization state; and
a phase structure on the first substrate or the second substrate and configured to change a polarization state of display light incident on the phase structure before the display light is diffracted by the reflective volume Bragg grating such that the display light incident on the reflective volume Bragg grating is predominantly in the first polarization state than the second polarization state with respect to the reflective volume Bragg grating to improve diffraction efficiency.