US 12,225,329 B2
Dual-modulation laser projection systems and methods
Juan P. Pertierra, Fishers, IN (US); Martin J. Richards, Gig Harbor, WA (US); and Dzhakhangir V. Khaydarov, Campbell, CA (US)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 17/439,786
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed Mar. 15, 2020, PCT No. PCT/US2020/022867
§ 371(c)(1), (2) Date Sep. 15, 2021,
PCT Pub. No. WO2020/190823, PCT Pub. Date Sep. 24, 2020.
Claims priority of provisional application 62/818,934, filed on Mar. 15, 2019.
Claims priority of application No. 19163175 (EP), filed on Mar. 15, 2019.
Prior Publication US 2022/0191440 A1, Jun. 16, 2022
Int. Cl. H04N 9/31 (2006.01); G02B 27/46 (2006.01)
CPC H04N 9/3167 (2013.01) [G02B 27/46 (2013.01); H04N 9/3126 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A dual-modulation laser projection system, comprising:
a polarizing beamsplitter for splitting laser light into first and second polarized beams having mutually orthogonal polarizations;
a phase spatial light modulator (SLM) for beam steering the second polarized beam;
a mechanical amplitude SLM for amplitude modulating a combination of (i) the first polarized beam and (ii) the second polarized beam as beam steered by the phase SLM, the mechanical amplitude SLM being configured to receive the first and second polarized beams from two different respective directions, so as to form the combination of the first and second polarized beams; and
a filter for removing, from an amplitude modulated combination of the first and second polarized beams, one or more of a plurality of diffraction orders introduced by the mechanical amplitude SLM, to generate filtered, modulated output light.