Abstract: In one embodiment, a method includes segmenting a layout of a physical space surrounding a user into physical segments; generating, based on the physical segments, virtual paths for a virtual environment through which the user can navigate by traveling the physical segments; identifying, based on a current location of the user with respect to the physical space, a portion of the physical segments for which to enable an intrusion detection feature; detecting a physical object in the portion of the physical segments that corresponds to a particular virtual path of the virtual paths; and in response to the detecting, displaying a representation of the physical object in the particular virtual path.

Abstract: An administered authentication system can authenticate an artificial reality device using an authorization record between a user account and an artificial reality device. In some implementations, the authorization record is created in response to activation of a user account-specific key sent to a user-supplied contact, where an artificial reality device identifier was provided with the user-supplied contact. In other implementations, the authorization record is created in response to activation of a user account-specific key provided to the artificial reality device as a code, where activation of the key includes adding an artificial reality device identifier to a key activation message. In yet other implementations, the authorization record is created in response to an application associated with a user account activating an artificial reality device-specific key, with an artificial reality device identifier, that is provided via the artificial reality device.

Abstract: Disclosed herein are a system, a method and a device for switching between different communications protocols. A head wearable display can transmit, to a console during a first session interval, a first request to switch from a first link using a first communication protocol to a second link using a second communication protocol. The first request can include at least one characteristic of the first link. The head wearable display can receive, from the console, a first response to the first request, to perform a switch from the first link to the second link. The first response can indicate a wake up time and a second session interval to perform the switch. The head wearable display can switch from the first link to the second link in the second session interval and after the wake up time.

Abstract: A method includes receiving a block comprising pixels; encoding the pixels by: arranging the pixels in a sequence; generating a delta encoding of the pixels, the delta encoding comprising (a) a base value and (b) delta values having non-zero delta values and zero delta values, each delta value representing a difference between a corresponding pixel in the sequence and a previous pixel in the sequence; generating a symbol mask indicating whether each of the delta values is zero or non-zero; determining, based on magnitudes of the non-zero delta values, a symbol width for encoding each of the non-zero delta values; generating a sequence of symbols that respectively encode the non-zero delta values using the symbol width; generating a compression of the block by collating the symbol mask, the symbol width, and the sequence of symbols.

Abstract: The disclosed strap adjustment devices may include a pinion gear, with a first rack secured to a first strap and a second rack secured to a second strap each engaged with the pinion gear. A rotatable cam element may include an angled radially outer surface that is at an angle to a circumference of the rotatable cam element. A bearing element may be positioned adjacent to the angled radially outer surface such that the bearing element jams between the angled radially outer surface and a braking surface when the rotatable cam element is rotated in a jamming direction. A spiral spring may be coupled to the pinion gear and the rotatable cam element to allow for an increase in length of the first and second straps upon application of a tension force to the first and second straps. Various other methods, systems, and devices are also disclosed.

Abstract: An optical assembly to be used in a head-mounted display (HMD) device or similar may include a first optical component and a second optical component, where the first optical component and the second optical component are layered in the optical assembly. The optical assembly may also include a waveguide positioned between the first optical component and the second optical component. One or more shock absorbers may be positioned on surfaces of the first optical component and the second optical component facing the waveguide. The shock absorbers may be a support that touches a surface of the waveguide or a stand-off that extends toward the waveguide with a gap. The shock absorbers may also include a pillar, a cone, an inverted cone, an inverted pillar, a spring, a double helix, a three-dimensional mesh, a strap, a bumper, a sphere, or a high aspect ratio 3D mesh tower.

Abstract: An off-normal bottom-emitting vertical cavity surface emitting laser (VCSEL) is integrated with a photonic integrated circuit (PIC) for incident light from the VCSEL to efficiently couple to a waveguide via a grating coupler in the PIC. Diffraction of the light by the grating coupler is in a direction that is aligned with an input of the waveguide such that most or all of the light enters the waveguide. The off-normal VCSEL output is achieved by arranging an output facet at a bottom surface of the VCSEL with decentered micro-lenses, micro-prisms, gratings, diffractive optical elements, and/or metasurfaces. The diffractive optical elements or metasurfaces may also be used for beam divergence mitigation and/or polarization control.

Abstract: An apparatus comprises a first photodiode, a second photodiode, a quantizer, a memory, and a controller configured to: set a first exposure period in which the first photodiode generates a first charge; set a second exposure period in which the second photodiode generates a second charge, the second exposure period being set based on the first exposure period and at least one of: a first time associated with a read out operation of the memory to a second apparatus, or a second time associated with a quantization operation by the quantizer; perform, using the quantizer, the first quantization operation of the first charge to generate a first digital output; and perform, using the quantizer, a second quantization operation of the second charge to generate a second digital output.

Abstract: An audio system for user hearing assessment includes one or more audio capture devices, and processing circuitry. The one or more audio capture devices are configured to capture audio of a conversation of a user and convert the audio to audio signals. The processing circuitry is configured to use the audio signals to identify multiple conditions associated with user hearing difficulty. The conditions include any of words, phrases, frequencies, or phonemes, and environmental audio conditions that are followed by an indication of user hearing difficulty. The processing circuitry is configured to generate a hearing profile for the user based on the identified conditions associated with user hearing difficulty. The processing circuitry is configured to adjust an operation of an audio output device using the hearing profile to reduce a frequency of user hearing difficulty if the user requires audio enhancement.

Abstract: The disclosed system may include a substructure configured to support various components, an actuator configured to provide substantially linear motion along a specified axis in response to an electrical input, an input component hingedly coupled to the substructure, where the input component is configured to receive input from a user, and a mechanical linkage coupled to the input component and to at least a portion of the actuator. The mechanical linkage may be configured to translate the substantially linear motion provided by the actuator to a rotary force applied to the input component via the mechanical linkage. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: A method includes a computing system receiving an image of a real-world environment, the image including at least a portion of a hand of a user of an artificial reality device, the hand comprising a palm and a plurality of fingers. The computing system determines a hand pose of the hand using the image, and defines, based on the hand pose, a three-dimensional surface positioned in the palm of the hand. The computing system determines, based on the hand pose, distances between predetermined portions of the plurality of fingers and the three-dimensional surface. The computing system assigns, based on the distances, a pose value for each of the plurality of fingers of the hand and determines, based on the pose values for the plurality of fingers, a grab state of the hand.

Abstract: In some implementations, the disclosed systems and methods can include one or more tinting elements (e.g., flip-down blacked-out lenses, a blacked-out slider, or a blacked-out removeable cover) configured to cover the lenses of the MR glasses. In some implementations, the disclosed systems and methods can be coupled to one or more micro electrical motors configured to drive the clear fluid into and out of the pairs of clear flexible membranes, in order to make the focus tunable lenses concave to correct myopia, or convex to correct hyperopia or presbyopia. In some implementations, the disclosed systems and methods can be directed to online calibration of headset proximity sensors to mitigate after factory sensor drift and prevent automatic OFF and ON system failures.

Abstract: An eye-tracking system may include an optical assembly with integrated micro light emitting diodes. The optical assembly may include a substrate and a flexible printed circuit board assembly bonded to the substrate. Micro light emitting diodes may also be bonded to the substrate. A plurality of conductors may be laminated in the substrate. The conductors may electrically connect the micro light emitting diodes to the printed circuit board assembly. An optically clear adhesive layer may be adhered to the substrate. The optically clear adhesive layer may include an anti-reflective layer and an optical adhesive layer to arranged in a stacked configuration.

Abstract: A far-field characteristic of light emitted by a micro light emitting diode (?LED) such as a beam shape, a beam orientation, a beam focusing, or a beam polarization is controlled by a metasurface of nanostructures formed on the ?LED. The metasurface is characterized or defined by a far-field objective function for the emitted light, selection of a nanostructure shape, and application of one or more fabrication constraints to shape parameters for the selected nanostructure shape. A number and a location of the nanostructures is determined employing an adjoint simulation technique, and the shape parameters for the nanostructure are tuned employing a shape optimization technique.

Abstract: Systems and methods for data transmission within the ultra-wideband ranging protocol include a first UWB device which determines a transmission block comprising a plurality of rounds each representing a period of time. The first UWB device performs a first wireless communication to perform ranging between the first UWB device and a second UWB device, within a first round of the plurality of rounds. The first UWB device may perform a second wireless communication to communicate data between the first UWB device and the second UWB device, which may be within the first round or a second round.

Abstract: A multilayer actuator includes a primary electrode, a secondary electrode overlapping at least a portion of the primary electrode, and an electroactive layer disposed between and abutting the primary electrode and the secondary electrode. The multilayer actuator further includes a primary antireflective coating overlapping at least a portion of the primary electrode opposite the electroactive layer, a secondary antireflective coating overlapping at least a portion of the secondary electrode opposite the electroactive layer, and a barrier layer overlapping the secondary antireflective coating opposite the secondary electrode.

Abstract: In some embodiments, a system comprises a static random access memory (SRAM) device and a controller. The SRAM device comprises a bit cell array comprising a plurality of bit cells arranged in a plurality of rows and a plurality of columns, each column operatively coupled to a pair of bit lines, wherein the plurality of columns is arranged as a plurality of column groups each comprising a plurality of local columns. The SRAM device further comprises a plurality of column decoders, each associated with a column group of the plurality of column groups. In some embodiments, the controller may be configured to read the local columns included in the column group by, for a given local column, sensing a voltage difference on a corresponding pair of bit lines, in a rearranged sequential order that is different from a physical sequential order of the plurality of local columns.

Abstract: Examples include a device including a fluid lens having a membrane, a substrate, and a fluid at least partially enclosed between the membrane and the substrate. One or more support structures may be configured to provide a guide path for an edge portion of the membrane, which may be an elastic membrane in tension. In some examples, a membrane includes a membrane polymer, such as a thermoplastic urethane polymer, and a polymer additive, such as an acrylate polymer. The polymer additive may reduce or substantially eliminate diffusion of the fluid into the membrane, which may increase the stability and performance of the fluid lens.

Abstract: In one embodiment, a computing system may determine a pose of a controller held by a user based on sensor data captured by the controller. The system may determine a pose of a headset worn by the user based on sensor data captured by the headset. The system may determine positions of a first set of keypoints associated with a body of the user based on (1) one or more first images captured by one or more cameras of the controller, (2) the pose of the controller, (3) one or more second images captured by one or more cameras of the headset and (4) the pose of the headset. The system may determine a full body pose of the user based at least on the positions of the first set of keypoints.