US 12,135,447 B2
LED illuminated waveguide projector display
David Woods, Chinnor (GB)
Assigned to Snap Inc., Santa Monica, CA (US)
Filed by Snap Inc., Santa Monica, CA (US)
Filed on Jun. 29, 2023, as Appl. No. 18/344,281.
Application 18/344,281 is a continuation of application No. 17/755,855, previously published as PCT/GB2020/052600, filed on Oct. 15, 2020.
Claims priority of application No. 1916369 (GB), filed on Nov. 11, 2019.
Prior Publication US 2023/0341603 A1, Oct. 26, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F21V 8/00 (2006.01); G02B 3/00 (2006.01)
CPC G02B 6/0018 (2013.01) [G02B 3/0056 (2013.01); G02B 6/0028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A projection display comprising:
a waveguide comprising an input grating having a plurality of linear diffractive features, the input grating being configured to couple light into the waveguide; and
an optical projector configured to form an illumination pupil which is optically relayed as an input pupil onto the input grating, at the input grating the input pupil having a shape that is larger in a direction parallel to the linear diffractive features than in a direction perpendicular to the linear diffractive features.