US 12,449,664 B2
Multi-layer coating structure to minimize phase shifts, method of manufacture, waveguide and head mount display
Ronen Chriki, Lod (IL); and Elad Sharlin, Ness Ziona (IL)
Assigned to LUMUS LTD., Ness Ziona (IL)
Filed by LUMUS LTD., Ness Ziona (IL)
Filed on Sep. 11, 2024, as Appl. No. 18/882,303.
Application 18/882,303 is a continuation of application No. 18/072,980, filed on Dec. 1, 2022, abandoned.
Prior Publication US 2025/0147315 A1, May 8, 2025
Int. Cl. G02B 27/01 (2006.01); G02B 3/08 (2006.01); G02B 6/00 (2006.01); G02B 27/14 (2006.01); G02F 1/1335 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 3/08 (2013.01); G02F 1/133536 (2013.01)] 35 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a waveguide; and
a plurality of partially reflective co-parallel surfaces embedded inside the waveguide at an angle relative to side-wall surfaces of the waveguide and configured to couple light out of the waveguide towards a predetermined eye motion box,
wherein each of the partially reflective co-parallel surfaces comprises a multi-layer coating structure,
wherein a first portion of the multi-layer coating structure induces an overall phase shift of light propagating through the first portion of the multi-layer coating structure, and
wherein a second portion of the multi-layer coating structure is selected to decrease the overall phase shift.