Methods and devices for haptic communication
Granted: April 30, 2024
Patent Number:
11969554
A haptic stimulator includes a multilayer sheet with a piezoelectric or electroactive polymer layer adapted to mechanically deform upon application of voltage, the multilayer sheet secured to a substrate, and a source of electrical stimulation coupled to drive electrodes on the polymer layer with an AC signal to vibrate the polymer layer. In particular embodiments, the polymer contains polyvinylidene fluoride, and electrodes are patterned to control local electric fields. Another haptic…
Multi-component detection of gestures
Granted: October 11, 2022
Patent Number:
11467675
This disclosure describes techniques for recognizing gestures performed by a user, including techniques for conserving power when performing finger or hand gesture recognition operations that involve processing electromyography (EMG) data. In one example, a wearable device capable of being worn by a user comprises: a motion detector configured to detect motion of the wearable device; a tissue movement sensor configured to collect tissue movement information associated with motion of…
Pixel sensor having multiple photodiodes
Granted: October 4, 2022
Patent Number:
11463636
In one example, an apparatus comprises: a plurality of photodiodes, one or more charge sensing units, one or more analog-to-digital converters (ADCs), and a controller. The controller is configured to: enable the each photodiode to generate charge in response to a different component of the incident light; transfer the charge from the plurality of photodiodes to the one or more charge sensing units to convert to voltages; receive a selection of one or more quantization processes of a…
IR transmissive visible-light barriers and devices including the same
Granted: October 4, 2022
Patent Number:
11463167
The disclosed visible-light barrier may include a light-scattering layer that preferentially scatters visible light over infrared light. The light-scattering layer may include (1) a substantially transparent or translucent material and (2) at least one of TiO2 or ZnO particles dispersed within the substantially transparent or translucent material at a concentration of from approximately 0.02 wt % to approximately 2 wt %. Various other articles, devices, systems, and methods are also…
Monitoring circuit including cascaded s-boxes for fault injection attack protection
Granted: September 20, 2022
Patent Number:
11449606
Systems on a chip (SoCs) include security logic configured to increase resistance to fault injection attacks (FIAs). The security logic includes a monitoring circuit and a cascaded series of substitution-boxes (S-Boxes) having a circuit delay that is designed to match (or most closely match) the computing device critical path length. The monitoring circuit monitors the number of iterations required for the cascaded series of S-Boxes to return to an initial value and generates an error…
Virtual reality-based augmented reality development system
Granted: September 20, 2022
Patent Number:
11449189
A virtual reality (VR) system is described that enables users to create, model, and visualize augmented reality experiences at physical, real-world locations, without needing to physically be at the location for which the augmented experience is being modeled. In one example, the VR system includes a head-mounted device (HMD), an augmented reality content development system, and a rendering engine. The HMD is configured to output VR content representing a physical environment for an…
Pancake lens including diffuser
Granted: September 20, 2022
Patent Number:
11448803
Various embodiments set forth a foveated display system and components thereof. The foveated display system includes a peripheral display module disposed in series with a foveal display module. The peripheral display module is configured to generate low-resolution, large field of view imagery for a user's peripheral vision. The foveal display module is configured to perform foveated rendering in which high-resolution imagery is focused towards a foveal region of the user's eye gaze. The…
High-resolution liquid crystal displays
Granted: September 13, 2022
Patent Number:
11442272
Various embodiments set forth high-resolution liquid crystal displays and components thereof. In some embodiments, light emitted by a high-resolution green color liquid crystal display is combined, via a combiner, with light emitted by at least one lower-resolution red and blue color liquid crystal display. The red and blue color display(s) may include a single display or two displays positioned on opposing sides of the combiner. The combiner may be a dichroic or polarization-based…
Fluidic valve
Granted: September 13, 2022
Patent Number:
11441702
The disclosed computer-implemented method may include a fluidic device comprising a chamber, an inlet port coupled to the chamber and configured to convey fluid to the chamber, and an outlet port coupled to the chamber and configured to convey the fluid from the chamber. The fluidic device may also have a restricting region that (1) is dimensioned to restrict a flow of the fluid through the outlet port when the pressure in the chamber is below a threshold level and (2) is configured to…
Systems and methods for graphics rendering based on machine learning
Granted: September 6, 2022
Patent Number:
11436793
Embodiments described herein pertain to a machine-learning approach for shading. A system may determine a number of pixels associated with a viewpoint of a viewer. The system may determine, for each of the pixels, (1) a view direction based on the viewpoint and a pixel position of that pixel and (2) and a surface orientation of a surface visible to that pixel. The system may generate, using a first machine-learning model, a latent space representation of ambient lighting information…
Gaze detection pipeline in an artificial reality system
Granted: September 6, 2022
Patent Number:
11435820
One embodiment of the present disclosure sets forth a method that includes receiving one or more two-dimensional images of one or more light patterns incident on an eye proximate to an eye region of a near-eye display device, and computing a gaze direction associated with the eye based on the one or more two-dimensional images.
Systems and methods for optical demodulation in a depth-sensing device
Granted: September 6, 2022
Patent Number:
11435448
An exemplary imaging device includes an optical sensor having an optical axis, a lens positioned to focus light from a scene onto the optical sensor, a matrix of variable-phase optical elements that are dimensioned to introduce at least two different phase delays into a wavefront of a light signal received from the scene through the lens, a housing that secures the matrix of variable-phase optical elements between the optical sensor and the lens, and a processing subsystem programmed to…
Optical assembly having a housing for mounting optical lenses
Granted: May 10, 2022
Patent Number:
11327266
A housing assembly for mounting a first lens and a second lens includes a first lens holder. The first lens holder includes a ring-shaped structure configured to mount the first lens. The housing assembly also includes a second lens holder including a cup-shaped structure. The cup-shaped structure includes an upper portion configured to mount the first lens holder, and a lower portion configured to mount the second lens.
Imaging device based on lens assembly with embedded filter
Granted: May 10, 2022
Patent Number:
11330193
An imaging device for imaging of a local area surrounding the imaging device. The imaging device includes a lens assembly, a filtering element and a detector. The lens assembly is configured to receive light from a local area surrounding the imaging device and to direct at least a portion of the received light to the detector. The filtering element is placed in the imaging device within the lens assembly such that light is incident at a surface of the filtering element within a range of…
Delimitation in unsupervised classification of gestures
Granted: May 10, 2022
Patent Number:
11328211
A method for classifying a gesture made in proximity to a touch interface. A system receives data related to the position and/or movement of hand. The data is delimited by identifying a variable length window of touch frames. The variable length window of touch frames is selected to include touch frames indicative of feature data. The variable length window of touch frames is classified based upon classifications learned by the classifying module to identify gestures.
Methods and apparatuses for low latency body state prediction based on neuromuscular data
Granted: May 10, 2022
Patent Number:
11327566
The disclosed method may include receiving neuromuscular activity data over a first time series from a first sensor on a wearable device donned by a user receiving ground truth data over a second time series from a second sensor that indicates a body part state of a body part of the user, generating one or more training datasets by time-shifting at least a portion of the neuromuscular activity data over the first time series relative to the second time series, to associate the…
Refractive index modulation modification in a holographic grating
Granted: May 10, 2022
Patent Number:
11327438
Techniques disclosed herein relate to modifying refractive index modulation in a holographic optical element, such as a holographic grating. According to certain embodiments, a holographic optical element or apodized grating includes a polymer layer comprising a first region characterized by a first refractive index and a second region characterized by a second refractive index. The holographic optical element or apodized grating includes a plurality of nanoparticles dispersed in the…
Suppressing coherence artifacts and optical interference in displays
Granted: May 10, 2022
Patent Number:
11327314
A display device including a laser-based light engine is disclosed. Optical interference effects due to the coherent nature of a laser light source are mitigated by shortening a coherence length of the laser source. The coherence length shortening is achieved by at least one of the following: providing a multiple longitudinal mode laser source, pulsing a laser source to achieve spectral broadening, or providing multi-emitter laser source(s) with emission wavelength varying from emitter…
Field curvature corrected display
Granted: May 10, 2022
Patent Number:
11327311
A head mounted display (HMD) includes a field curvature corrected (FC) display to mitigate field curvature in an image that is output to a user's eyes. The FC display includes elements that generate the image light and elements to mitigate field curvature from the image light. The FC display may include a display panel with lenses, a display panel with a reflective polarizer and reflective surface, or other optical elements. The FC display may include a pancake lens configuration…
Angular performance of apochromatic pancharatnam berry phase components using a C-plate
Granted: May 10, 2022
Patent Number:
11327306
A near eye display (NED) includes multiple PBP optical elements combined with one or more C-plates to improve optical angular performance. The PBP optical elements may be configured for beam steering or for focusing light to a point. A C-plate may reduce or eliminate an undesirable polarization phase shift introduced by the PBP optical elements to angular, off-axis light. Birefringence of the PBP optical elements produces such a polarization phase shift. A C-plate provides an additional…
