US 12,032,178 B2
Multiview backlight, display, and method having optical mask elements
David A. Fattal, Menlo Park, CA (US); Joseph D. Lowney, Menlo Park, CA (US); and Thomas Hoekman, Menlo Park, CA (US)
Assigned to LEIA INC., Menlo Park, CA (US)
Filed by LEIA INC., Menlo Park, CA (US)
Filed on Apr. 19, 2021, as Appl. No. 17/234,495.
Application 17/234,495 is a continuation of application No. PCT/US2019/058100, filed on Oct. 25, 2019.
Claims priority of provisional application 62/753,876, filed on Oct. 31, 2018.
Prior Publication US 2021/0240005 A1, Aug. 5, 2021
Int. Cl. G02B 30/33 (2020.01); F21V 8/00 (2006.01); H04N 9/31 (2006.01)
CPC G02B 30/33 (2020.01) [G02B 6/0051 (2013.01); H04N 9/3197 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multiview backlight comprising:
a light guide configured to guide light as guided light; and
an array of multibeam unit cells distributed across the light guide, each multibeam unit cell having a multibeam element configured to scatter out a portion of the guided light as a plurality of directional light beams having different directions corresponding to different views of a multiview display, and an optical mask element having a first portion aligned and co-extensive with the multibeam element and a second portion laterally displaced within the multibeam unit cell from the first portion,
wherein an overall size of the optical mask element is configured to mitigate Moiréassociated with the optical mask element;
wherein the second portion is laterally displaced from the first portion by distance corresponding to an integer multiple of a pixel pitch of the multiview display, and the overall size of the optical mask element comprising a combined area of the first and second portions is an integer multiple of a square of the pixel pitch.