US 11,750,780 B1
Method and system for eyebox expansion in display systems
Haiwei Chen, Santa Clara, CA (US); Chulwoo Oh, Cedar Park, TX (US); Kibyung Seong, Santa Clara, CA (US); Seokchan Hong, Palo Alto, CA (US); Suchit Shah, San Jose, CA (US); and Bo Qu, Pleasanton, CA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Oct. 26, 2022, as Appl. No. 17/973,693.
Application 17/973,693 is a continuation of application No. 17/241,693, filed on Apr. 27, 2021, granted, now 11,553,163.
Int. Cl. H04N 9/31 (2006.01); G02B 27/01 (2006.01); G02B 27/28 (2006.01)
CPC H04N 9/3152 (2013.01) [G02B 27/0172 (2013.01); H04N 9/3161 (2013.01); G02B 27/28 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a projector operable to produce a light beam propagating along an optical path; and
a set of optical elements disposed along the optical path, wherein the set of optical elements includes:
a polarization rotator operable to produce a right-hand circularly polarized beam in a first state and a left-hand circularly polarized beam in a second state;
a first diffractive element operable to receive the right-hand circularly polarized beam and the left-hand circularly polarized beam and generate:
a first circularly polarized beam propagating at a first angle with respect to the optical path in the first state; and
a second circularly polarized beam propagating at a second angle with respect to the optical path and equal and opposite to the first angle; and
a second diffractive element positioned a first distance from the first diffractive element and operable to:
convert the first circularly polarized beam into a first circularly polarized output beam; and
convert the second circularly polarized beam into a second circularly polarized output beam, wherein the first circularly polarized output beam and the second circularly polarized output beam are separated by a second distance.