US 12,449,670 B2
Optical elements for displays
Daniel Adema, Kitchener (CA); and Ian Andrews, Kitchener (CA)
Assigned to GOOGLE LLC, Mountain View, CA (US)
Appl. No. 17/764,657
Filed by GOOGLE LLC, Mountain View, CA (US)
PCT Filed Jan. 8, 2021, PCT No. PCT/US2021/012704
§ 371(c)(1), (2) Date Mar. 29, 2022,
PCT Pub. No. WO2021/142263, PCT Pub. Date Jul. 15, 2021.
Claims priority of provisional application 62/959,417, filed on Jan. 10, 2020.
Prior Publication US 2022/0326537 A1, Oct. 13, 2022
Int. Cl. G02B 27/10 (2006.01); F21V 8/00 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/102 (2013.01) [G02B 6/0023 (2013.01); G02B 27/0172 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical element comprising:
a light guide;
an incoupler optically coupled to the light guide; and
a beam splitter disposed in an optical path of a display beam representative of an image,
the display beam comprising a first beam and a second beam, the second beam having a color associated with at least a wavelength that is longer than corresponding wavelengths associated with a corresponding color of the first beam, the beam splitter to split the display beam to form a first offspring beam comprising the first beam and a first portion of the second beam, and to form a second offspring beam comprising a second portion of the second beam, the first offspring beam and the second offspring beam concurrently incident upon the incoupler at a first incidence position and a second incidence position respectively, the first incidence position different than the second incidence position.