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1. (WO2018106515) WAVEGUIDES WITH PERIPHERAL SIDE GEOMETRIES TO RECYCLE LIGHT

Pub. No.:    WO/2018/106515    International Application No.:    PCT/US2017/064102
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Sat Dec 02 00:59:59 CET 2017
IPC: F21V 8/00
G02B 6/10
G02B 27/01
Applicants: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventors: WALL, R., Andrew
RESHIDKO, Dmitry
Title: WAVEGUIDES WITH PERIPHERAL SIDE GEOMETRIES TO RECYCLE LIGHT
Abstract:
An apparatus, for use in replicating an image associated with an input-pupil to an output-pupil, comprises an optical waveguide including a bulk-substrate, an input-coupler and an output-coupler. The bulk-substrate includes first and second major sides and peripheral sides. The input-coupler couples, into the waveguide, light corresponding to the image associated with the input-pupil. The output-coupler couples, out of the waveguide, light corresponding to the image that has traveled through the waveguide from the input-coupler to the output-coupler at least in part by way of TIR. At least one of the peripheral sides includes first and second surfaces that define first and second planes angled 45 degrees relative to one another. Such a peripheral side provides for effective recycling of light that would otherwise leak out of the waveguide through the peripheral side.