Meta Platforms Technologies, LLC

Jacques Gollier, Jr

Yusufu Njoni Bamaxam Sulai

Fenglin Peng

Babak Amirsolaimani

Andrew John Ouderkirk

Ying Geng

Brian M Wheelwright

Scott Charles McEldowney

Giuseppe Calafiore

Wanli Chi

Wai Sze Tiffany Lam

Tanya Malhotra

Maxwell Parsons

Renate Eva Klementine Landig

Yang Yang

Zhimin Shi

Daniel Guenther Greif

Sihui He

Xiayu Feng

Nicholas John Diorio, Jr

A switchable grating may be used to redirect illuminating light for illuminating a user's eye in an eye tracking system, to facilitate the determination of eye position and/or orientation. The eye tracking system may be used in a near-eye display. An eye tracking camera obtains an eye image, and a controller performs an initial determination of the eye position. The controller may switch the switchable grating to direct the illuminating light beam onto the eye, for a better position and/or eye orientation determination.

Eye tracking with switchable gratings

Ghost images can interfere with eye tracking in a system that uses folded optics, such as is an artificial-reality display. Optical elements, such as waveplates and/or polarizers, can be used to attenuate or eliminate light causing the ghost images.

Enabling eye tracking in pancake lens optics

An optical assembly includes a partial reflector that is optically coupled with a first polarization volume holographic element. The partial reflector is capable of receiving first light having a first circular polarization and transmitting a portion of the first light having a first circular polarization. The first polarization volume holographic element is configured to receive the first portion of the first light and reflect the first portion of the first light as second light having the first circular polarization. The partial reflector is capable of receiving the second light and reflecting a first portion of the second light as third light having a second circular polarization opposite to the first polarization. The first polarization volume holographic element is configured to receive the third light having the second circular polarization and transmit the third light having the second circular polarization.

Optical assembly with polarization volume holographic element

Growing community of inventors

Sammamish, WA, United States of America

Jacques Gollier, Jr