Morgan, Lewis & Bockius LLP
Optical assemblies having polarization volume gratings for projecting augmented reality content
An optical assembly for projecting light from a display includes a first optical waveguide, a reflective optical element configured, and a first in-coupler. The reflective optical element is configured to receive first light having first polarization from the display and to reflect the first light as second light having second polarization distinct from the first polarization. The first in-coupler is coupled with the first optical waveguide. The first in-coupler is configured to receive and transmit the first light. The first in-coupler is further configured to receive the second light and redirect a first portion of the second light so that the first portion of the second light undergoes total internal reflection inside the first optical waveguide.
FACEBOOK TECHNOLOGIES, LLC
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