US 12,405,471 B2
Apparatus for providing waveguide displays with two-dimensional pupil expansion
Milan Momcilo Popovich, Leicester (GB); Jonathan David Waldern, Diablo, 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 Sep. 11, 2023, as Appl. No. 18/465,091.
Application 18/465,091 is a continuation of application No. 17/655,756, filed on Mar. 21, 2022, granted, now 11,754,842.
Application 17/655,756 is a continuation of application No. 17/118,285, filed on Dec. 10, 2020, granted, now 11,281,013, issued on Mar. 22, 2022.
Application 17/118,285 is a continuation of application No. 16/806,947, filed on Mar. 2, 2020, abandoned.
Application 16/806,947 is a continuation of application No. 15/765,243, granted, now 10,690,916, issued on Jun. 23, 2020, previously published as PCT/GB2016/000181, filed on Oct. 4, 2016.
Claims priority of provisional application 62/285,275, filed on Oct. 23, 2015.
Claims priority of provisional application 62/284,603, filed on Oct. 5, 2015.
Prior Publication US 2024/0255760 A1, Aug. 1, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 5/18 (2006.01); G02B 27/00 (2006.01); G02F 1/29 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/1866 (2013.01); G02B 6/0016 (2013.01); G02B 6/0035 (2013.01); G02B 6/0076 (2013.01); G02B 27/0081 (2013.01); G02B 27/0093 (2013.01); G02B 27/0179 (2013.01); G02F 1/292 (2013.01); G02B 2027/0114 (2013.01); G02B 2027/0125 (2013.01); G02B 2027/0187 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An optical display, comprising:
a first waveguide having a first surface and a second surface;
an input coupler;
a fold grating;
a first output grating and a second output grating overlapping the first output grating; and
an input image node (IIN),
wherein said input coupler is configured to receive collimated first wavelength image modulated light from said IIN and to cause said first wavelength image modulated light to travel within the first waveguide via total internal reflection between said first surface and said second surface to the fold grating;
wherein said fold grating is configured to provide pupil expansion in a first direction and to direct said first wavelength image modulated light to the first output grating and the second output grating via total internal reflection between the first surface and the second surface; and
wherein the first output grating is configured to diffract the light from the fold grating into a first angular range and the second output grating is configured to diffract light from the fold grating into a second angular range different from the first angular range.