Liquid crystal polarization hologram (LCPH) based eye tracking for AR/VR
US12372797B2 · kind B2 · utility
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Key dates
| Filing date | Dec 16, 2021 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | May 3, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0187
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An eye-tracking system includes a substrate transparent to visible light and configured to be placed in a field of view of an eye of a user, a plurality of waveguides on the substrate, a light source optically coupled to the plurality of waveguides, and a plurality of polarization volume holograms (PVHs) in the field of view of the eye of the user. Each PVH of the plurality of PVHs is optically coupled to a respective waveguide of the plurality of waveguides and is configured to couple a respective light beam out of the respective waveguide towards the eye of the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.