Facebook Technologies, LLC

Meta Platforms Technologies, LLC

Facebook Technologigegs, LLC

Giuseppe Calafiore

Matthew E Colburn

Alexander Koshelev

Maxwell Parsons

Nihar Ranjan Mohanty

Matthieu Charles Raoul Leibovici

Pasi Saarikko

Hee Yoon Lee

Austin Lane

Ningfeng Huang

Wanli Chi

Barry David Silverstein

Andrew John Ouderkirk

Lu Lu

Babak Amirsolaimani

Wai Sze Tiffany Lam

Erik Shipton

Jacques Gollier

Fenglin Peng

Andrew Maimone

Oleg Yaroshchuk

Zhimin Shi

Ying Geng

Scott Charles McEldowney

Stephan Lutgen

Gang Li

Alireza Moheghi

Yu Shi

David Massoubre

Robin Sharma

Tanya Malhotra

Yun-Han Lee

Renate Eva Klementine Landig

Yang Yang

Tingling Rao

Yongdan Hu

John Goward

Daniel Guenther Greif

Sihui He

Nicholas John Diorio, Jr

Francois Olivier

Francois Gerard Franck Olivier

Heeyoon Lee

Keith Patterson

Zhujun Shi

Qi Zhang

Karol Constantine Hatzilias

Mengfei Wang

Ankit Vora

Christopher Yuan Ting Liao

Jonathan Robert Peterson

Maik Andre Scheller

Selso Luanava

Xiayu Feng

Jacques Gollier, Jr

Peter Topalian

Eric Fest

Ehsan Ordouie

Emily Anne Makoutz

Zachary Perlmutter

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

A device for providing a 1D line of an image is disclosed. The device includes a wavelength-tunable light source for providing image light having the angular distribution encoded in optical spectrum. The device further includes a thin slab waveguide having an out-coupler in form of a diffraction grating for out-coupling the image light at an angle dependent on wavelength. The image may be formed by scanning a collimated beam propagating in the slab waveguide when using tunable monochromatic light sources, or by forming the 1D singular distribution of brightness at a same time when using a tunable-spectrum light sources. The device may be used in a near-eye display for forming a 2D image in angular domain.

Thin waveguide wavelength-selective projector

Disclosed herein is a nanoimprint lithography (NIL) soft mold precursor material comprising a curable fluorinated base resin component, one or more additives, one or more crosslinkers, and one or more of a photo radical generator, a photo acid generator, or both. According to certain embodiments, further disclosed herein are a polymeric material comprising a partially or totally polymerized or crosslinked NIL precursor material, a NIL soft mold comprising the polymeric material, a process for making the NIL soft mold, and a method of using the NIL soft mold to form a NIL grating.

Soft mold formulations for surface relief grating fabrication with imprinting lithography

A self-lit display panel includes a photonic integrated circuit payer including an array of waveguides and an array of out-couplers for out-coupling portions of the illuminating light through pixels of the panel. The self-lit display panel may include a transparent electronic circuitry layer backlit by the photonic integrated circuit layer; the two layers may be on a same substrate or on opposed substrates defining a cell filled with an electro-active material. The configuration allows for chief ray engineering, zonal illuminating, and separate illumination with red, green, and blue illuminating light.

Self-lit display panel

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 waveguide. The device also includes a plurality of grating sets coupled with the waveguide and configured to, during a plurality of time periods, couple a plurality of input image lights into and out of the waveguide as a plurality of output image lights. In a first grating set of the plurality of grating sets, a first vector sum of in-plane projections of grating vectors associated with all gratings included in the first grating set is a first non-null vector. In a second grating set of the plurality of grating sets, a second vector sum of in-plane projections of grating vectors associated with all gratings included in the second grating set is a second non-null vector. The first vector sum and the second vector sum have different directions.

Optical system and method for providing expanded field of view

A device includes a light source to emit light and a light detector to receive the light emitted by the light source. The device may include a high voltage optical transformer and may be configured such that the light detector is laterally spaced away from the light source. In some architectures, the light source and the light detector may be arranged in a common plane. A photonic integrated circuit may be used to couple light emitted from the light source to the light detector.

Photonic power converter light transport

A system includes one or more waveguides, and a plurality of grating sets coupled with the one or more waveguides. A plurality of combinations of gratings from the grating sets are configurable to direct an image light to propagate through a plurality of sub-eyeboxes forming an uncompressed eyebox. The system also includes a controller configured to selectively configure one or more combinations of gratings to operate in a diffraction state to direct the image light to propagate through one or more sub-eyeboxes forming a compressed eyebox having a size smaller than a size of the uncompressed eyebox.

Optical system and method for providing compressed eyebox

An optical device with a variable index of refraction is formed by exposing a film to an energy gradient. The optical device has angular selectivity. The optical device can be used as an output coupler for a waveguide used in a virtual-reality and/or augmented-reality apparatus.

Diffraction grating with a variable refractive index formed using an energy gradient

A waveguide assembly is provided. The waveguide assembly includes a pair of pupil-replicating waveguides. The first pupil-replicating waveguide is configured for receiving an input beam of image light and providing an intermediate beam comprising multiple offset portions of the input beam. The second pupil-replicating waveguide is configured for receiving the intermediate beam from the first pupil-replicating waveguide and providing an output beam comprising multiple offset portions of the intermediate beam. The input beam may be expanded by the waveguide assembly in such a manner that pupil gaps are reduced or eliminated.

Cascaded pupil-replicating waveguides

A display device with a transparent illuminator and an liquid crystal (LC) display panel is disclosed. The transparent illuminator includes a light source and a transparent lightguide, which may be based on a slab of transparent material with zigzag light propagation of the illuminating light in the slab and/or a transparent photonic integrated circuit with singlemode ridge waveguides for spreading the illuminating light in a plane parallel to the plane of LC display panel. The lightguide includes a plurality of grating out-couplers whose position is coordinated with positions of LC pixels for higher throughput. A reflective offset-to-angle optical element may be provided to form an image in angular domain through the LC panel and through the transparent illuminator, resulting in an overall compact and efficient display configuration.

Display device with transparent illuminator

A display device includes a directional illuminator providing a light beam, a display panel downstream of a directional illuminator, for receiving and spatially modulating the light beam, and a beam redirecting module downstream of the display panel, for variably redirecting the spatially modulated light beam. Steering the illuminating light by the beam redirecting module enables one to steer the exit pupil of the display device to match the user's eye location(s).

Display with image light steering

In some embodiments, a photonic switch includes a first layer, a cantilever coupler, and a set of electrodes. The first layer includes a first waveguide that directs light in a first direction and a second waveguide that directs light in a second direction that is different from the first direction. The cantilever coupler is formed from a lithium niobate material and disposed over the first layer. The cantilever coupler includes a first end that is positioned over the first waveguide and a second end that is bonded to the second waveguide. The set of electrodes apply an electric potential across the first end, which deforms the first waveguide to couple to the second waveguide and propagates light between the first waveguide and the second waveguide.

Photonic switch with a cantilever coupler

Disclosed herein are techniques for molding a slanted structure. In some embodiments, a mold for nanoimprint lithography includes a support layer, a polymeric layer on the support layer and including a slanted structure, and an oxide layer on surfaces of the slanted structure. In some embodiments, the oxide layer is conformally deposited on the surfaces of the slanted structure by atomic layer deposition. In some embodiments, the mold further includes an anti-sticking layer on the oxide layer.

Techniques for reducing surface adhesion during demolding in nanoimprint lithography

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Redmond, WA, United States of America

Giuseppe Calafiore