Meta Platforms Technologies, LLC

Nicholas John Diorio, Jr

Xiayu Feng

Andrew John Ouderkirk

Lu Lu

Giuseppe Calafiore

Wanli Chi

Fenglin Peng

Babak Amirsolaimani

Tanya Malhotra

Maxwell Parsons

Renate Eva Klementine Landig

Yang Yang

Zhimin Shi

Daniel Guenther Greif

Yuge Huang

Sihui He

Kai-Han Chang

Jacques Gollier

Francis Lawrence Leard

Jasmine Soria Sears

Afsoon Jamali

Mengfei Wang

Gareth John Valentine

Chenrun Feng

Xi Wu

Jacques Gollier, Jr

Olga Vladimirovna Barykina-tassa

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

An optical device includes a first set of one or more electrodes, a second set of one or more electrodes distinct and separate from the first set of one or more electrodes, and a medium that includes liquid crystal physical gel. The medium is located between the first set of one or more electrodes and the second set of one or more electrodes. The optical device may operate as an optical dimming device, which may be used in head-mounted display devices or as dimmable windows or shutters.

Dimming devices with pixelated liquid crystal physical gels

A device includes a plurality of electrode layers. The device also includes a birefringent medium layer disposed between the plurality of electrode layers. The device also includes at least one alignment structure disposed at a surface of the birefringent medium layer. The birefringent medium layer includes liquid crystal molecules arranged in a plurality of helical twist structures having a helical axis. The plurality of electrode layers are configured to generate an electric field within the birefringent medium layer, and the liquid crystal molecules are aligned via the electric field to be titled with respect to the helical axis.

Heliconical liquid crystal polarization hologram and device including the same

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.

A device includes a polymer stabilized blue phase liquid crystal ('PS-BPLC') layer. The device also includes an alignment structure coupled with the PS-BPLC layer. LC molecules disposed in contact with the alignment structure are configured to have a spatially varying in-plane orientation pattern that is at least partially defined by the alignment structure. The PS-BPLC layer is configured to forwardly deflect a polarized light having a predetermined handedness, and transmit a polarized light having a handedness that is orthogonal to the predetermined handedness.

Blue phase liquid crystal polarization hologram comprising liquid crystal molecules having a spatially varying in-plane orientation pattern and device including the same

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Duvall, WA, United States of America

Nicholas John Diorio, Jr