US 12,379,547 B2
Waveguide grating device
Jonathan David Waldern, Diablo, 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 May 15, 2023, as Appl. No. 18/317,864.
Application 18/317,864 is a continuation of application No. 17/457,893, filed on Dec. 6, 2021, granted, now 11,703,645.
Application 17/457,893 is a continuation of application No. 16/734,208, filed on Jan. 3, 2020, granted, now 11,194,098, issued on Dec. 7, 2021.
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 2024/0019640 A1, Jan. 18, 2024
Int. Cl. G02B 6/34 (2006.01); F21V 8/00 (2006.01); G02B 5/18 (2006.01); G02B 5/32 (2006.01); G02B 6/124 (2006.01); G02B 27/01 (2006.01); G02B 27/42 (2006.01); G02F 1/1334 (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)] 22 Claims
OG exemplary drawing
 
1. An optical waveguide display comprising:
a waveguide;
a source of light modulated with temporally-varying angularly-distributed information;
a fold grating of a first prescription configured as an evanescently coupled layer in proximity to the waveguide;
an input coupler for directing the light into total internal reflection (TIR) paths in a first propagation direction in the waveguide; and
an output grating for extracting the light from the waveguide,
wherein the fold grating provides a first beam expansion and diffracts light in the first propagation direction into a second propagation direction,
wherein the output grating provides a second beam expansion,
wherein light in a first TIR angular range in the first propagation direction undergoes at least two diffractions within the fold grating,
wherein each ray from the first angular range and its corresponding diffracted rays lie on a diffraction cone of the fold grating,
wherein each diffraction provides a unique TIR angular range along the second propagation direction.