US 12,092,825 B2
Compact head-mounted display system having uniform image
Yaakov Amitai, Rehovot (IL)
Assigned to LUMUS LTD., Ness Ziona (IL)
Filed by Lumus Ltd., Ness Ziona (IL)
Filed on Nov. 23, 2022, as Appl. No. 17/993,056.
Application 17/993,056 is a continuation of application No. 17/060,268, filed on Oct. 1, 2020, granted, now 11,531,201.
Application 17/060,268 is a continuation of application No. 15/549,603, abandoned, previously published as PCT/IL2016/050158, filed on Feb. 10, 2016.
Claims priority of application No. 237337 (IL), filed on Feb. 19, 2015.
Prior Publication US 2023/0088054 A1, Mar. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 27/14 (2006.01); G02B 27/28 (2006.01); G02B 27/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0016 (2013.01); G02B 6/0035 (2013.01); G02B 27/0176 (2013.01); G02B 27/142 (2013.01); G02B 27/145 (2013.01); G02B 27/148 (2013.01); G02B 27/283 (2013.01); G02B 27/0081 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/012 (2013.01); G02B 2027/0125 (2013.01); G02B 2027/015 (2013.01); G02B 2027/0152 (2013.01); G02B 2027/0178 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical system comprising:
a waveguide having a pair of parallel surfaces for guiding light by internal reflection;
an input coupler, wherein the input coupler is configured to couple light corresponding to a collimated image into the waveguide so as to propagate within the waveguide by total internal reflection;
an output coupler, wherein the output coupler is configured to couple the light out of the waveguide; and
a partially reflective element parallel to, between and separated from, the pair of parallel surfaces, the partially reflective element at least partially overlapping the input coupler,
wherein the partially reflective element is partially reflective and partially transmissive for light of each of at least three wavelengths propagating within the waveguide, the at least three wavelengths including 470 nm, 550 nm and 630 nm, and is deployed such that, after the input coupler, for each wavelength of light, the light impinges on the partially reflective element which transmits a first portion of the light so that the first portion of the light is next reflected at a first of the parallel surfaces and reflects a second portion of the light so that the second portion of the light is next reflected at a second of the parallel surfaces.