- Patent Title: Camera comprising an infrared illuminator and a liquid crystal optical filter switchable between a reflection state and a transmission state for infrared imaging and spectral imaging, and method thereof
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Application No.: US16002862Application Date: 2018-06-07
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Publication No.: US10972643B2Publication Date: 2021-04-06
- Inventor: Onur Can Akkaya , Cyrus Soli Bamji
- Applicant: Microsoft Technology Licensing, LLC
- Applicant Address: US WA Redmond
- Assignee: Microsoft Technology Licensing, LLC
- Current Assignee: Microsoft Technology Licensing, LLC
- Current Assignee Address: US WA Redmond
- Agency: Alleman Hall Creasman & Tuttle LLP
- Main IPC: H04N5/225
- IPC: H04N5/225 ; H04N5/33 ; G02F1/1347 ; G02F1/1335 ; G02F1/13363 ; G02B5/30 ; G01S17/894 ; G03B11/00 ; G03B9/00

Abstract:
An optical filter for a camera is switchable between a reflection state and a transmission state. The optical filter includes a first plurality of liquid crystals configured to dynamically form cholesteric phase structures in the reflection state that block right-handed circularly polarized light in a spectral light sub-band and transmit light outside of the spectral light sub-band. The first plurality of liquid crystals dynamically forms a nematic phase arrangement in the transmission state that transmits light in the spectral light sub-band. The optical filter further includes a second plurality of liquid crystals configured to dynamically form cholesteric phase structures in the reflection state that block left-handed circularly polarized light in the spectral light sub-band and transmit light outside of the spectral light sub-band. The second plurality of liquid crystals dynamically form a nematic phase arrangement in the transmission state that transmits light in the spectral light sub-band.
Public/Granted literature
- US20190306386A1 LIQUID CRYSTAL OPTICAL FILTER FOR CAMERA Public/Granted day:2019-10-03
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