US 11,994,681 B2
Optical systems with reflective prism input couplers
Vikrant Bhakta, Santa Clara, CA (US); Guolin Peng, Sunnyvale, CA (US); Hyungryul Choi, San Jose, CA (US); Kevin A. Keilbach, Boulder, CO (US); and Scott M. DeLapp, San Diego, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 16, 2021, as Appl. No. 17/477,321.
Application 17/477,321 is a continuation of application No. PCT/US2020/050709, filed on Sep. 14, 2020.
Claims priority of provisional application 62/902,645, filed on Sep. 19, 2019.
Prior Publication US 2022/0004007 A1, Jan. 6, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0016 (2013.01); G02B 6/003 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0147 (2013.01); G02B 2027/0163 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A display system comprising:
a display module that produces image light;
a waveguide;
a reflective input coupling prism mounted to the waveguide, wherein the reflective input coupling prism is configured to receive the image light through the waveguide, the reflective input coupling prism is configured to reflect the image light into the waveguide, and the waveguide is configured to propagate the reflected image light via total internal reflection; and
an output coupler on the waveguide and configured to couple the reflected image light out of the waveguide, wherein the output coupler comprises diffractive grating structures in a grating medium embedded within the waveguide.