Diffractive gratings for eye-tracking illumination through a light-guide
US10838132B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2018 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Aug 21, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/013
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Techniques for eye-tracking in a near-eye display system are disclosed. One example of a near-eye display system includes a substrate transparent to visible light and configured to be placed in front of a user's eye, one or more light sources configured to emit illumination light invisible to the user's eye, one or more input couplers configured to couple the illumination light into the substrate, and one or more grating couplers each configured to couple a portion of the illumination light out of the substrate and towards the user's eye at a different direction. The illumination light coupled into the substrate propagates within the substrate through total internal reflection. The one or more grating couplers include at least one of a chirped surface-relief grating coupler or a volume Bragg grating coupler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.