Abstract: A battery cell including an electrode assembly contained within a housing. The electrode assembly shrinks and/or swells depending on a charge/discharge cycle of the cell. A swelling compensation member configured to shrink upon swelling of the electrode assembly, and expand upon on shrinking of the electrode assembly is in continuous contact with the electrode assembly and an innermost surface of the housing. A first portion of the innermost surface of the housing is in contact with the swelling compensation member, and a second portion is free from contact with the swelling compensation member. The battery cell includes a cooling member in thermal contact with the outermost surface of the housing. Part of the outermost surface of the housing in contact with the cooling member corresponds to a part of the innermost surface of the housing which is free from contact with the swelling compensation member.

Abstract: An example method includes obtaining, by a global navigation satellite system (GNSS) processor of a mobile computing device and based on signals received from GNSS satellites, a stream of I/Q samples; providing, by the GNSS processor and for another processor, the stream of I/Q samples; receiving, by the GNSS processor and from the other processor, aiding data that is determined based on the stream of I/Q samples, wherein the aiding data, that includes: a code phase, a frequency, and a time for a GNSS satellite of the GNSS satellites; and processing, by the GNSS processor and based on the aiding data, the stream of I/Q samples to determine a first fix for the mobile computing device.

Abstract: An interfacing structure for a head-mounted display system with a head-mounted display unit having a display and a positioning and stabilising structure structured and arranged to hold the head-mounted display unit in an operable position on a user's head in use, includes a face engaging portion configured to engage around a periphery of an eye region of the user's face in use, the face engaging portion being flexible and resilient and including at least one face engaging flange forming at least one closed loop portion having an enclosed cross section, the face engaging flange being shaped to form an enclosed loop in cross section to form the closed loop portion, the closed loop portion of the face engaging flange being integrally formed in a continuous loop.

Abstract: A lanyard to hold a controller for a headset is provided. The lanyard includes a strap anchored on a top portion of a lid for a battery case of the controller, and a clip anchored to an opening pin in a bottom portion of the lid for the battery case of the controller. The strap includes a stretchable fabric and multiple sticky pads on an outer face that adhere to the stretchable fabric when the strap is looped around the clip. A headset using a controller that includes a lanyard as above, and the controller, are also provided.

Abstract: A head-mounted display system comprising: a head-mounted display unit comprising: a display unit housing comprising a display; and an interfacing structure; and a positioning and stabilising structure comprising: a pair of arms connected in use to respective lateral sides of the display unit housing, the arms being substantially rigid and being constructed and arranged to project posteriorly from the display unit housing on respective lateral sides, a posterior portion of each arm comprising a superior arm connection portion and an inferior arm connection portion; a top strap portion to connect between each of the superior arm connection portions of the pair of arms and the head-mounted display unit; and an occipital strap portion to connect between the inferior arm connection portions and engage a portion of the user's head overlying or lying inferior to an occipital region of the user's head in use.

Abstract: Systems and methods of separating the input light path from the output light path of a scanning mirror in a laser projector system while keeping the overall footprint of the laser projector system to a minimum. The system includes a scanning mirror, an optical engine, and an input/output (I/O) separator disposed between the optical engine and the scanning mirror to direct light from the optical engine towards the scanning mirror along an input path and to direct light reflected from the scanning mirror along an output path. The I/O separator, disposed to intersect both the input and output paths, can be implemented as a prism or a combination of a polarizing beam splitter and a quarter wave plate.

Abstract: A fractional-N PLL includes a reference oscillator, a multi-modulus divider-based phase-error-to-digital converter driven by the reference oscillator, a digital loop filter, and a digitally controlled oscillator. Digital-to-time to converter mismatch noise cancellation digital logic is between the phase-error-to-digital converter and the digital loop filter. Error from digital-to-time converter component mismatches is partially cancelled by the digital logic.

Abstract: A head-mounted display system comprising a head-mounted display unit; and a positioning and stabilising structure structured and arranged to hold the head-mounted display unit in an operational position over a user's face in use, the head-mounted display unit comprising an interfacing structure constructed and arranged to be in opposing relation with the user's face, wherein the interfacing structure comprises a flexible and resilient face engaging portion, the face engaging portion having a pair of check portions configured to contact the user's checks in use, each check portion comprising at least one loop portion having an at least partially enclosed cross section; wherein the interfacing structure comprises a medial support portion medial of each check portion configured to provide support for the at least one loop portion.

Abstract: An electrical device including a surface which may be exposed to heat derived from operation of the electrical device such that the temperature of the surface increases during operation. The surface includes a temperature sensor including first and second electrodes separated by a layer of control material. The material properties and/or configuration of the control material are selected such that the electrical conductivity of the control material increases with increasing temperature so that electrical current is able to pass between the first and second electrodes once the temperature of any part of the control material has reached or exceeded a predetermined temperature. The temperature sensor extends over substantially the whole of the surface. A system including the electrical device and a method of controlling the electrical device is also disclosed.

Abstract: A head-mounted display system includes a head-mounted display unit a display that, in use, is held in an operational position over a user's face. The head-mounted display system further comprises a flow generator configured to generate a flow of air, and an air guide arrangement coupled to the flow generator to enable the flow generator to direct air to, or draw air from, one or more selected areas in proximity of the head-mounted display system.

Abstract: A head-mounted display (HMD) system includes a lens element supported by a support structure. The lens element includes a waveguide that includes an incoupler, an outcoupler, and an exit pupil expander. The incoupler is disposed within a first area of the waveguide. The outcoupler is disposed within a second area of the waveguide. The exit pupil expander is disposed within a third area of the waveguide. An anti-reflection coating is formed via fabrication used to form the incoupler, the outcoupler, and the exit pupil expander. The anti-reflection coating is disposed within a fourth area of the waveguide different than the first, second, and third areas of the waveguide.

Abstract: Some embodiments of the present disclosure include a digital-to-analog conversion system configured to reduce inter-symbol interference (ISI) in high-speed continuous-time DACs. The system can include a main DAC with multiple sub-DACs, each configured to process a portion of a digital input sequence and generate part of an output waveform. To address ISI errors introduced by the sub-DACs, the system can include an ISI mitigation feedback loop. The ISI mitigation feedback loop can include an analog-to-digital converter (ADC) that generates a digital sequence from the output waveform and an analog correction signal generated by a correction DAC. A fractional decimation filter can be used to adjust a sampling rate and attenuate high-frequency components. A digital error estimator can generate an error cancellation sequence by correlating encoder information with the input sequence. The correction DAC can use the error cancellation sequence to generate the analog correction signal.

Abstract: The present disclosure describes techniques and arrangements for directing light from an optical engine to one of a plurality of incouplers in a multiple incoupler waveguide system. For example, the present disclosure describes a plurality of reflective and transmissive elements to selectively direct light based on a plurality of optical characteristics to a first incoupler or a second incoupler.

Abstract: A head-mounted display system includes a head-mounted display unit and a positioning and stabilising structure structured and arranged to hold the head-mounted display unit in an operational position over a user's face in use. The positioning and stabilising structure includes a rear support structure adapted to contact posterior regions of a user's head and at least one connector structured and arranged to interconnect the rear support structure to the head-mounted display unit. The rear support structure is in the form of a hoop comprising an occipital portion configured and arranged engage the user's head along a portion of the occipital bone adjacent a junction where the neck muscles attach to the occipital bone in use.

Abstract: A WHUD includes an optical scanner having two scan mirrors and a multi-pass optical relay. The first scan mirror receives light emitted from an optical engine representative of one or more images. The first scan mirror oscillates in a first direction such that the received light is scanned in a first direction and provides the light scanned in the first direction to a multi-pass optical relay. The multi-pass optical relay then relays the light to a second scan mirror. The second scan mirror is configured to oscillate in a second direction such that the relayed light is scanned in both the first and second directions. The second scan mirror then provides the light scanned in the first and second directions back to the multi-pass optical relay which relays the light scanned in the first and second directions to an incoupler of a waveguide.

Abstract: A laser projection system utilizes a waveguide having a narrow incoupler for double-bounce mitigation and form factor reduction. An optical scanner includes an optical relay positioned in between two scan mirrors. The first scan mirror scans laser light into the optical relay in a first dimension, and the optical relay and converges the scanned laser light towards a second scan mirror. The second scan mirror scans laser light along a second dimension substantially perpendicular to a path over which the laser light is scanned across the second scan mirror, and the convergence introduced by the optical relay causes the laser light to be scanned as a line or arc path of an exit pupil plane that is coincident with the incoupler. The optical relay may include one or more lenses or may be a monolithic molded structure, which may be an Offner-style relay or a molded reflective relay.

Abstract: A display system includes one or more low-power laser diodes, each producing an emission. The emissions are directed to an optical element that affects the direction or divergence of the emissions. The optical element redirects the emissions toward a steering element such as a MEMS-actuated mirror, or a combination of such mirrors. The steering element directs the emissions toward the incoupler of a waveguide acting as an optical combiner. The emissions propagate through the waveguide and are extracted by an outcoupler in the direction of an observer. By scanning the direction of the beam-steering element along one or several directions, an image may be formed.

Abstract: A head-mounted display system includes a head-mounted display unit and a positioning and stabilising structure structured and arranged to hold the head-mounted display unit in an operational position over a user's face in use. The positioning and stabilising structure includes a rear support structure adapted to contact posterior regions of a user's head and at least one connector structured and arranged to interconnect the rear support structure to the head-mounted display unit. The rear support structure is in the form of a hoop comprising an occipital portion configured and arranged engage the user's head along a portion of the occipital bone adjacent a junction where the neck muscles attach to the occipital bone in use.