US 12,276,808 B2
Systems and methods for digital laser projection with increased contrast using Fourier filter
Juan Pablo Pertierra, Fishers, IN (US); and Martin J. Richards, Gig Harbor, WA (US)
Assigned to DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
Appl. No. 17/043,734
Filed by DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
PCT Filed Apr. 1, 2019, PCT No. PCT/US2019/025217
§ 371(c)(1), (2) Date Sep. 30, 2020,
PCT Pub. No. WO2019/195182, PCT Pub. Date Oct. 10, 2019.
Claims priority of provisional application 62/651,657, filed on Apr. 2, 2018.
Claims priority of application No. 18180390 (EP), filed on Jun. 28, 2018.
Prior Publication US 2021/0141238 A1, May 13, 2021
Int. Cl. G02F 1/01 (2006.01); G02B 26/00 (2006.01); G02B 26/08 (2006.01); G02B 27/30 (2006.01); G02B 27/42 (2006.01); G03B 21/00 (2006.01); H04N 9/31 (2006.01)
CPC G02B 27/4244 (2013.01) [G02B 26/008 (2013.01); G02B 26/0833 (2013.01); G02B 27/30 (2013.01); G03B 21/008 (2013.01); H04N 9/3117 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A time-multiplexed modulator system for generating an image, comprising:
a spatial light modulator configured to modulate, according to the image, time-multiplexed light into time-multiplexed modulated light forming a repeating sequence of first, second, and third modulated lights;
a lens configured to spatially Fourier transform the time-multiplexed modulated light onto a Fourier plane; and
a filter wheel positioned at the Fourier plane and comprising a plurality of optical filter masks, each of the optical filter masks being configured to filter a corresponding one of the first, second, and third modulated lights, as spatially Fourier-transformed by the lens, by transmitting at least one diffraction order of the corresponding one of the first, second, and third modulated lights, and blocking a remaining portion of the corresponding one of the first, second, and third modulated lights, the filter wheel being configured to rotate synchronously with the time-multiplexed modulated light such that each of the optical filter masks is positioned in the time-multiplexed modulated light at the Fourier plane when the time-multiplexed modulated light is the corresponding one of the first, second, and third modulated lights, wherein the first, second, and third modulated lights are red, green, and blue, respectively.