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1. (WO2018200141) COMPACT DISPLAY ENGINE WITH MEMS SCANNERS

Pub. No.:    WO/2018/200141    International Application No.:    PCT/US2018/025974
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Thu Apr 05 01:59:59 CEST 2018
IPC: G02B 27/01
G02B 27/28
G02B 5/30
G02B 26/10
Applicants: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventors: ROBBINS, Steven John
Title: COMPACT DISPLAY ENGINE WITH MEMS SCANNERS
Abstract:
A near-eye optical display system utilizes a compact display engine that couples image light from an imager to a waveguide-based display having diffractive optical elements (DOEs) that provide exit pupil expansion in two directions. The display engine comprises a pair of single axis MEMS (Micro Electro Mechanical System) scanners that are configured to reflect the image light through horizontal and vertical scan axes of the display system's field of view (FOV) using raster scanning. The MEMS scanners are arranged with their axes of rotation at substantially right angles to each other and operate with respective quarter wave retarder plates and a polarizing beam splitter (PBS) to couple the image light into an in-coupling DOE in the waveguide display without the need for additional optical elements such as lenses or relay systems.