Eye tracking based on polarization volume grating
US10634907B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2018 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Dec 19, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/70
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An eye-tracker for determining a position of the pupil of an eye includes a detector and an optical element. The optical element has a first side facing the detector and an opposing second side. The optical element is configured to receive light reflected off the eye on the first side and redirect a portion of the reflected light that has a first wavelength in a spectral range and a first circular polarization toward the detector. The optical element is also configured to light that is outside the spectral range and light that has a second circular polarization opposite to the first circular polarization. A head-mounted display device that includes a display system and the eye-tracker is also disclosed. A method for determining the location of a pupil of an eye is also disclosed herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.