- Patent Title: Switchable reflective circular polarizer in head-mounted display
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Application No.: US16657337Application Date: 2019-10-18
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Publication No.: US11002898B2Publication Date: 2021-05-11
- Inventor: Fenglin Peng , Ying Geng , Yusufu Njoni Bamaxam Sulai , Mengfei Wang , Lu Lu , Jacques Gollier
- Applicant: Facebook Technologies, LLC
- Applicant Address: US CA Menlo Park
- Assignee: Facebook Technologies, LLC
- Current Assignee: Facebook Technologies, LLC
- Current Assignee Address: US CA Menlo Park
- Agency: Weaver Austin Villeneuve & Sampson LLP
- Main IPC: G02B5/30
- IPC: G02B5/30 ; G02B27/01 ; G02F1/1335 ; G02F1/137 ; G02B27/09 ; G02F1/13363 ; G02B5/32

Abstract:
Disclosed herein are techniques for displaying images on multiple image planes in a near-eye display system. A switchable optical device includes a first polarizer configurable to polarize incident light into light of a first circular polarization state, and a second polarizer configurable to transmit light of a second circular polarization state and reflect light of the first circular polarization state into light of the first circular polarization state. The switchable optical device also includes a partial reflector positioned between the first polarizer and the second polarizer. The partial reflector is configured to transmit light from the first polarizer and reflect light from the second polarizer, where the reflected light and the light from the second polarizer have different polarization states. At least one of the first polarizer or the second polarizer includes a cholesteric liquid crystal (CLC) circular polarizer that is switchable by a voltage signal.
Public/Granted literature
- US20200049872A1 SWITCHABLE REFLECTIVE CIRCULAR POLARIZER IN HEAD-MOUNTED DISPLAY Public/Granted day:2020-02-13
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