US 11,703,645 B2
Waveguide grating device
Jonathan David Waldern, Los Altos Hills, CA (US); Alastair John Grant, San Jose, CA (US); Milan Momcilo Popovich, Leicester (GB); James H. Stanley, Cedar Rapids, IA (US); and Robert D. Brown, Cedar Rapids, IA (US)
Assigned to DigiLens Inc., Sunnyvale, CA (US); and Rockwell Collins, Inc., Cedar Rapids, IA (US)
Filed by DigiLens Inc., Sunnyvale, CA (US); and Rockwell Collins, Inc., Cedar Rapids, IA (US)
Filed on Dec. 6, 2021, as Appl. No. 17/457,893.
Application 17/457,893 is a continuation of application No. 16/734,208, filed on Jan. 3, 2020, granted, now 11,194,098.
Application 16/734,208 is a continuation of application No. 16/178,104, filed on Nov. 1, 2018, granted, now 10,527,797, issued on Jan. 7, 2020.
Application 16/178,104 is a continuation of application No. 15/807,149, filed on Nov. 8, 2017, granted, now 10,156,681, issued on Dec. 18, 2018.
Application 15/807,149 is a continuation of application No. 15/468,536, filed on Mar. 24, 2017, granted, now 9,823,423, issued on Nov. 21, 2017.
Application 15/468,536 is a continuation of application No. 14/620,969, filed on Feb. 12, 2015, granted, now 9,632,226, issued on Apr. 25, 2017.
Prior Publication US 2022/0163728 A1, May 26, 2022
Int. Cl. G02B 6/34 (2006.01); G02B 5/18 (2006.01); G02B 27/42 (2006.01); G02B 27/01 (2006.01); G02F 1/1334 (2006.01); G02B 5/32 (2006.01); G02B 6/124 (2006.01); F21V 8/00 (2006.01)
CPC G02B 6/34 (2013.01) [G02B 5/1819 (2013.01); G02B 5/1823 (2013.01); G02B 5/32 (2013.01); G02B 6/0016 (2013.01); G02B 6/124 (2013.01); G02B 27/0172 (2013.01); G02B 27/4205 (2013.01); G02B 27/4261 (2013.01); G02F 1/13342 (2013.01); G02B 2027/0125 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical waveguide display comprising:
a waveguide;
a source of light;
an input coupler for directing the light into total internal reflection (TIR) paths in a first propagation direction in the waveguide;
a first grating configured to diffract an incident light ray coupled into the waveguide as a diffracted ray in a first angular range at least twice and deflect the diffracted ray into a second propagation direction, wherein the first grating diffraction provides a unique diffraction efficiency versus angle characteristic along the second propagation direction; and
a second grating configured to diffract the incident light ray coupled into said waveguide as a diffracted ray in a second angular range at least twice and deflect the diffracted ray into a third propagation direction, wherein the second grating diffraction provides a unique diffraction efficiency versus angle characteristic along the third propagation direction,
wherein in each of the first grating and second grating, the diffracted ray and the corresponding incident ray lie on a diffraction cone of the first grating or the second grating, and
wherein the first grating and second grating provide beam expansion and extraction of light from the waveguide.