Abstract: A system for making a holographic medium includes a light source configured to provide light, and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium, a second set of optical elements configured to transmit the second portion of the light for providing a second wide-field beam, and a plurality of prisms optically coupled with the second set of optical elements and configured to receive the second wide-field beam and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.

Abstract: An example method of identifying a touch gesture on a user is provided. The method includes receiving, by one or more transducers of a first wearable device attached to a first appendage of the user, a set of signals transmitted by a second wearable device attached to the user, wherein (i) receiving the set of signals creates a signal pathway between the first and second wearable devices, and (ii) signals in the set of signals propagate through at least the user's first appendage. The method also includes determining baseline characteristics for the signal pathway created between the first wearable device and the second wearable device, sensing a change in the baseline characteristics while receiving the set of signals, and in accordance with a determination that the sensed change in the baseline characteristics for the signal pathway satisfies a contact criterion, report a candidate touch event on the user's first appendage.

Abstract: An electronic device with a display selects a subset of templates from a library of templates. Each of the templates comprises logged movements of one or more predefined input device types in a 3D space and each template includes one or more movement parameters. The electronic device tracks, for a user, movement parameters of at least one input device of the user. The at least one input device corresponds to one of the predefined input device types. The electronic device compares the tracked movement parameters of the at least one input device of the user to the movement parameters for the subset of the templates selected from the library of templates. The electronic device predicts, based on the comparison, a goal target ray, within the 3D space. In some embodiments, the goal target ray is highlighted or visually emphasized according to the prediction.

Abstract: Apparatuses and methods are presented relating to a plurality of current sources for generating a plurality of first bias currents to drive a plurality of LEDs and a plurality of measurement circuits for obtaining a plurality of first voltage measurements for the LEDs during a first test cycle. The current sources are further configurable to generate a plurality of second bias currents for driving the LEDs, and the measurement circuits are further configurable to obtain a plurality of second voltage measurements for the plurality of LEDs, during a second test cycle. A memory device is configured to store the first and second bias currents and first and second voltage measurements as a current-voltage (I-V) performance characteristic.

Abstract: An imaging device includes a focusing element, an image sensor, and an actuator configured to translate at least one of the image sensor and the focusing element relative to each other. A controller of the imaging device is configured to use the image sensor to capture an image frame including at least a portion of the image of the object, determine a current position of the image of the object in the image frame, determine a deviation of the current position from a target position of the image of the object in the image frame, and operate the actuator to reduce the deviation. In this manner, the image of the object may be brought to a center of a captured image frame. Such an imaging device may be used as a self-aligning eye-tracking camera in a near-eye display.

Abstract: Techniques related to laser lift-off masks are disclosed. In some embodiments, masking material is applied to a substrate that is attached to a plurality of semiconductor device sets. More specifically, the masking material is applied to one or more regions of the substrate between the semiconductor device sets. When the semiconductor device sets are embedded in a filling material, the masking material may be situated between the substrate and the filling material. Thus, transmitting light through the substrate toward the semiconductor device sets causes the substrate to become detached from the semiconductor device sets. However, the light is at least partially occluded by the masking material.

Abstract: A nano-structure includes an outer area at an edge of the nano-structure. A width of the outer area defined by a distance from the edge of the nano-structure is less than 100 ?m. A depth of the nano-structure in the outer area changes gradually between 0% and at least 50% of a maximum depth of the nano-structure. A method includes forming an etch mask on a substrate and etching the substrate with the etch mask using an ion beam to form a nano-structure in the substrate. The etch mask includes an outer area near an edge of the etch mask. A width of the outer area defined by a distance from the edge of the etch mask is less than 100 ?m. A duty cycle of the etch mask in the outer area changes gradually between at least 10% and at least 90%.

Abstract: Methods and systems for performing analog-to-digital conversion is provided. In one example, an analog-to-digital converter (ADC) circuit comprises a leakage compensation circuit and a quantizer. The leakage compensation circuit is configured to: receive an input signal, the input signal being susceptible to a drift due to a charge leakage; receive a reference signal; and generate a leakage-compensated signal pair to compensate for the charge leakage, wherein the leakage-compensated signal pair comprises one of: (a) a leakage-compensated version of the input signal and the reference signal, (b) the input signal and a leakage-compensated version of the reference signal, or (c) a leakage-compensated version of the input signal and a leakage-compensated version of the reference signal. The quantizer is configured to perform a leakage-compensated quantization of the input signal based on the leakage-compensated signal pair to generate a digital output representing the input signal.

Abstract: A method of determining contact on a user of a virtual reality and/or augmented reality device includes a first device including a plurality of transducers and a control circuit coupled to the plurality of transducers. The method includes activating one or more of the first plurality of transducers and generating waves that couple into at least a portion of a first appendage of a user wearing the first wearable device. The method further includes at a second wearable device having a second plurality of transducers, receiving at least a portion of the waves generated by the first plurality of transducers when the first appendage of the user is within a threshold distance from the second wearable device.

Abstract: Disclosed herein are techniques for eye tracking in near-eye display devices. In some embodiments, an illuminator for eye tracking is provided. The illuminator includes a light source configured to be positioned within a field of view of an eye of a user; a first reflector configured to shadow the light source from a field of view of a camera; and a second reflector configured to receive light from the light source that is reflected by the eye of the user, and to direct the light toward the camera.

Abstract: Disclosed are techniques related to reflectors having overall mesa shapes. Such a reflector may be formed over an overall mesa-shaped, layered structure of an apparatus for emitting light. The overall mesa-shaped, layered structure may comprise a mesa complement structure, a first-type doped semiconductor, a light emission layer, and a second-type doped semiconductor arranged in layers. Thus, the reflector may be configured to collimate light that emits from the light emission layer and reaches the reflector through the mesa complement structure.

Abstract: Described herein are light emitting apparatuses with minimized light emission areas and methods for fabricating such apparatuses. In certain embodiments, the emission area corresponds to an area of an electrical contact and is minimized by minimizing the area of the electrical contact. The electrical contact is configured to receive an electrical signal that causes a light emission layer to generate light. The light emission layer is between a first semiconductor layer and a second semiconductor layer, with the electrical contact being formed on the second semiconductor layer. To protect the second semiconductor layer from damage during an etching process, a conductive body is formed around the electrical contact, where the conductive body is a non-ohmic contact to the second semiconductor layer. The conductive body acts as an etch stop against unintended etching of the second semiconductor layer as a result of an alignment error during the etching process.

Abstract: A photo sensor includes a plurality of pixel blocks, each including one or more anchor pixels and one or more non-anchor pixels. The anchor pixels produce first sensor signals and the non-anchor pixels produce second sensor signals. An amplifier circuit amplifies the first and second sensor signals. A variable bit-depth analog to digital converter (ADC) circuit quantizes amplified versions of the first sensor signals into first digitized sensor signals with a first bit-depth. The ADC circuit also quantizes amplified versions of the second sensor signals into second digitized sensor signals with a second bit-depth that is lower than the first bit depth. The second bit-depth may be selected based on anchor pixel statistics derived from the one or more first digitized sensor signals.

Abstract: An optical element is produced by introducing a first liquid and a second liquid into respective inlets of a mold. The inlets are connected to a channel that extends to an outlet of the mold, the channel being tapered towards the outlet. The first and second liquids have different refractive indices and partially diffuse into each other inside the channel to form a multi-layer structure. The multi-layer structure is extruded through the outlet, onto a substrate. Curing the first and second liquids forms a solid optical element having a spatially varying refractive index profile in at least one dimension.

Abstract: One embodiment of the present disclosure sets forth a near-eye display system. The near-eye display system comprises a structured light generator including a plurality of reflective surfaces and configured to project a structured light pattern into an eye region of the near-eye display device, the structured light pattern generated based on a diffraction grating created by displacing at least a subset of the plurality of reflective surfaces. The near-eye display system further comprises an image capture device configured to capture one or more images of the structured light pattern incident on an eye proximate to the eye region and a depth mapping controller configured to generate a depth map of the eye based on the captured one or more images.

Abstract: A sensor assembly for determining one or more features of a local area is presented herein. The sensor assembly includes a plurality of stacked sensor layers. A first sensor layer of the plurality of stacked sensor layers located on top of the sensor assembly includes an array of pixels. The top sensor layer can be configured to capture one or more images of light reflected from one or more objects in the local area. The sensor assembly further includes one or more sensor layers located beneath the top sensor layer. The one or more sensor layers can be configured to process data related to the captured one or more images. A plurality of sensor assemblies can be integrated into an artificial reality system, e.g., a head-mounted display.

Abstract: A transcription engine transcribes input received from an augmented reality keyboard based on a sequence of hand poses performed by a user when typing. A hand pose generator analyzes video of the user typing to generate the sequence of hand poses. The transcription engine implements a set of transcription models to generate a series of keystrokes based on the sequence of hand poses. Each keystroke in the series may correspond to one or more hand poses in the sequence of hand poses. The transcription engine monitors the behavior of the user and selects between transcription models depending on the attention level of the user. The transcription engine may select a first transcription model when the user types in a focused manner and then select a second transcription model when the user types in a less focused, conversational manner.

Abstract: One embodiment of the present application sets forth a computer-implemented method that includes receiving, from a first microphone, a first input acoustic signal, generating a first audio spectrum from at least the first input acoustic signal, where the first audio spectrum includes a set of time-frequency bins, for each time-frequency bin included in the set of time-frequency bins, computing a weighted local space-domain distance (LSDD) spectrum value based on a portion of the first audio spectrum that is included in the time-frequency bin, generating a combined spectrum value based on a set of the weighted LSDD spectrum values computed for the set of time-frequency bins, and determining a first estimated direction of the first input acoustic signal based on the combined spectrum value.

Abstract: A waveguide display includes a source assembly, an output waveguide, and a controller. The source assembly includes a light source and an optics system. The light source includes source elements arranged in a 1D or 2D array that emit image light that is temporally incoherent and spatially coherent. In some embodiments, the light source includes an array of superluminous LEDs, an array of laser diodes, an array of resonant cavity LEDs, or some combination thereof. The optics system includes a scanning assembly that scans the image light to particular locations based on scanning instructions. The output waveguide receives the scanned image light from the scanning assembly and outputs an expanded image light. The controller generates the scanning instructions and provides the scanning instructions to the light source.

Abstract: A lens includes immobilized liquid crystals. The liquid crystals in a first region are aligned in a first orientation. The liquid crystals in a second region, located between the first region and a third region and adjacent to the first region and the third region, are aligned in a second orientation that is distinct from the first orientation. The liquid crystals in the third region, located between the second region and a fourth region and adjacent to the second region and the fourth region, are aligned in the first orientation. The liquid crystals in the fourth region, located adjacent to the third region, are aligned in the second orientation. A device with the lens and an array of light emitting devices is also disclosed.