Patent · US Active

Eye tracking with switchable gratings

US11846774B2 · kind B2 · utility

0Cited by

22References

18Claims

0Family size

Assignee

Meta Platforms Technologies, LLC · US

Inventors

Sihui He · Sunnyvale, US
Jacques Gollier · Sammamish, US
Maxwell Parsons · Seattle, US
Babak Amirsolaimani · Redmond, US
Wanli Chi · Rochester, US
Daniel Guenther Greif · Redmond, US
Renate Eva Klementine Landig · Seattle, US
Xiayu Feng · Kent, US
Zhimin Shi · Bellevue, US
Nicholas John Diorio · Duvall, US
Yang Yang · Beijing, CN
Giuseppe Calafiore · Redmond, US
Fenglin Peng · Redmond, US
Tanya Malhotra · Redmond, US
Andrew John Ouderkirk · Kirkland, US

Key dates

Filing date	Mar 17, 2022
Grant date	Dec 19, 2023
Priority date	—
Expiry date	Mar 17, 2042

Classification

Technology area (CPC H)Electricity
CPC primaryH04N23/10
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A pupil-replicating lightguide includes a slab of transparent material, a switchable out-coupling grating for out-coupling portions of image light to propagate towards an eyebox, and a switchable tracking grating for redirecting tracking light carrying an eye image towards an eye tracking camera. One of the two gratings may be turned ON while the other is turned OFF, in a time-sequential manner, allowing the combined use of the pupil-replicating lightguide for carrying image light and eye tracking light.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.