Invention Grant
- Patent Title: Angular performance of apochromatic pancharatnam berry phase components using a C-plate
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Application No.: US16006701Application Date: 2018-06-12
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Publication No.: US11327306B2Publication Date: 2022-05-10
- Inventor: Wai Sze Tiffany Lam , Lu Lu
- 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: Artegis Law Group, LLP
- Main IPC: G02F1/29
- IPC: G02F1/29 ; G02B27/01 ; G02F1/1335 ; G02F1/139 ; G02F1/13363 ; G02B27/28 ; G02B27/00 ; G02B5/30 ; G02B27/42 ; G02F1/1347

Abstract:
A near eye display (NED) includes multiple PBP optical elements combined with one or more C-plates to improve optical angular performance. The PBP optical elements may be configured for beam steering or for focusing light to a point. A C-plate may reduce or eliminate an undesirable polarization phase shift introduced by the PBP optical elements to angular, off-axis light. Birefringence of the PBP optical elements produces such a polarization phase shift. A C-plate provides an additional polarization phase shift that is opposite to the extra polarization phase shift by the PBP optical elements. Thus, the additional polarization phase shift by the C-plate at least partially reduces the phase shift by the PBP element.
Public/Granted literature
- US20190285890A1 ANGULAR PERFORMANCE OF APOCHROMATIC PANCHARATNAM BERRY PHASE COMPONENTS USING A C-PLATE Public/Granted day:2019-09-19
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