US 11,709,373 B2
Waveguide laser illuminator incorporating a despeckler
Milan Momcilo Popovich, Leicester (GB); Jonathan David Waldern, Los Altos Hills, CA (US); and Alastair John Grant, San Jose, CA (US)
Assigned to DigiLens Inc., Sunnyvale, CA (US)
Filed by DigiLens Inc., Sunnyvale, CA (US)
Filed on Apr. 18, 2022, as Appl. No. 17/659,639.
Application 17/659,639 is a continuation of application No. 17/214,362, filed on Mar. 26, 2021, granted, now 11,307,432.
Application 17/214,362 is a continuation of application No. 16/888,360, filed on May 29, 2020, granted, now 11,106,048, issued on Aug. 31, 2021.
Application 16/888,360 is a continuation of application No. 15/502,583, granted, now 10,670,876, issued on Jun. 2, 2020, previously published as PCT/GB2015/000225, filed on Aug. 4, 2015.
Claims priority of provisional application 61/999,866, filed on Aug. 8, 2014.
Prior Publication US 2022/0244559 A1, Aug. 4, 2022
Int. Cl. G02B 27/42 (2006.01); G02B 27/48 (2006.01); G02B 5/32 (2006.01); F21V 8/00 (2006.01); G02F 1/29 (2006.01); G02F 1/313 (2006.01)
CPC G02B 27/48 (2013.01) [G02B 5/32 (2013.01); G02B 6/0016 (2013.01); G02B 6/0038 (2013.01); G02B 6/0055 (2013.01); G02B 6/0083 (2013.01); G02B 27/4261 (2013.01); G02F 1/292 (2013.01); G02F 1/3136 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An image projection device comprising:
a light source;
a reflective microdisplay;
a waveguide comprising:
an input grating for coupling light from said light source into a total internal reflection (TIR) path in said waveguide; and
an output grating for coupling light from said TIR path out of said waveguide and towards said reflective microdisplay,
wherein said waveguide is formed from transparent lamina sandwiching said input grating and said output grating,
wherein said output grating is configured to diffract light polarized in a first direction towards said reflective microdisplay and transmit light reflected from said reflective microdisplay and polarized in a second direction; and
a lens for projecting image modulated light reflected from said microdisplay over a field of view.