US 11,852,822 B2
Convertible waveguide optical engine assembly for head-mounted device
Stephen Pombo, Campbell, CA (US); and Christopher Parkinson, Richland, WA (US)
Assigned to RealWear, Inc., Vancouver, WA (US)
Filed by RealWear, Inc., Vancouver, WA (US)
Filed on Dec. 15, 2021, as Appl. No. 17/552,338.
Application 17/552,338 is a continuation in part of application No. 17/538,712, filed on Nov. 30, 2021.
Claims priority of provisional application 63/220,237, filed on Jul. 9, 2021.
Prior Publication US 2023/0010650 A1, Jan. 12, 2023
Int. Cl. G02B 27/01 (2006.01); G02B 6/00 (2006.01); G02B 6/34 (2006.01); G02B 27/09 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0176 (2013.01); G02B 6/00 (2013.01); G02B 6/34 (2013.01); G02B 27/0101 (2013.01); G02B 27/017 (2013.01); G02B 27/0972 (2013.01); G02B 2027/014 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0125 (2013.01); G02B 2027/0178 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A waveguide optical engine assembly comprising:
a base;
a waveguide having an input portion and an electrochromic layer positioned adjacent to a rear surface of the waveguide; and
a projection assembly configured to project a source image,
wherein the waveguide and the projection assembly are secured to the base and the source image received by the input portion of the waveguide is displayed in a display surface of the waveguide, the electrochromic layer being configured to switch the waveguide between a transparent configuration and an opaque configuration based on an electrical stimulus.