US 12,092,820 B2
Holographic virtual reality display
Jonghyun Kim, San Jose, CA (US); Ward Lopes, Redwood City, CA (US); David Luebke, Charlottesville, VA (US); and Manu Gopakumar, Saratoga, CA (US)
Assigned to NVIDIA CORPORATION, Santa Clara, CA (US)
Filed by NVIDIA Corporation, Santa Clara, CA (US)
Filed on Sep. 14, 2021, as Appl. No. 17/475,081.
Claims priority of provisional application 63/176,108, filed on Apr. 16, 2021.
Prior Publication US 2022/0334392 A1, Oct. 20, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 7/04 (2021.01); G03H 1/22 (2006.01); G06F 3/01 (2006.01); G06T 19/00 (2011.01)
CPC G02B 27/0103 (2013.01) [G02B 7/04 (2013.01); G02B 27/0172 (2013.01); G03H 1/2294 (2013.01); G06F 3/013 (2013.01); G06T 19/006 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01); G03H 2223/16 (2013.01); G03H 2223/19 (2013.01); G03H 2223/22 (2013.01)] 27 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a virtual reality (VR) display, including:
at least one coherent light source,
at least one holographic waveguide coupled to the at least one coherent light source to receive light therefrom, and
at least one spatial light modulator coupled to the at least one holographic waveguide to modulate the light;
wherein the coherent light source includes a point light source that emits the light, a concave mirror that reflects the light emitted by the point light source, and a beam splitter that directs the light reflected by the concave mirror to the holographic waveguide;
wherein a phase and amplitude to be used by the spatial light modulator is determined based on a simulation where:
a complex wavefront at the spatial light modulator is simulated using an input phase and an input amplitude,
the input phase and the input amplitude are transformed to move to a frequency domain of the spatial light modulator,
the frequency domain is repeated to produce a plurality of higher order copies of the input phase and the input amplitude in the frequency domain,
the plurality of higher order copies of the input phase and the input amplitude are multiplied by an angular spectrum method (ASM) phase delay and a two-dimensional (2D) sinc amplitude that accounts for a finite pixel pitch of the spatial light modulator, to result in a propagation amplitude and propagation phase in the frequency domain, and
the propagation amplitude and propagation phase in the frequency domain are converted back from the frequency domain to produce the phase and the amplitude to be used by the spatial light modulator.