Invention Application
- Patent Title: Devices and Methods for Speckle Reduction in Scanning Projectors
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Application No.: US15096791Application Date: 2016-04-12
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Publication No.: US20170293156A1Publication Date: 2017-10-12
- Inventor: Matthieu Saracco , Roeland Collet
- Applicant: Microvision, Inc.
- Main IPC: G02B27/48
- IPC: G02B27/48 ; H04N9/31 ; G02B1/11 ; G03B21/20 ; G02B27/28 ; G02B26/10

Abstract:
Devices and methods are described herein that use a first solid figure element, a polarizing beam splitter, and a second solid figure element to reduce speckle in projected images. Specifically, laser light is generated and split into two portions having orthogonal polarizations. The first portion of laser light is internally reflected off at least three internal faces of the second solid figure element and is then spatially recombined with the second portion of laser light in the first solid figure element. The difference in path length followed by the two portions generates a temporal incoherence in the recombined laser light beam, and that temporal incoherence reduces speckle in the projected image.
Public/Granted literature
- US10001656B2 Devices and methods for speckle reduction in scanning projectors Public/Granted day:2018-06-19
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