In various examples, a head-mountable display (“HMD”) may include a light source to emit light across a target region of a wearer, a light sensor, and a circuitry operably coupled with the light source and the light sensor. The circuitry may operate the light source to periodically emit light across the light sensor. Based on a determination that a time interval since the circuitry last received a signal from the light sensor satisfies a threshold, the circuitry may trigger a remedial action to cause the light source to cease emission of light across the target region of the wearer.

MEMS devices include a suspended element connected to a fixed part of a substrate by one or more flexures, wherein the one or more flexures are configured to permit movement of the suspended element relative to a fixed part of the substrate. An actuator coupled to the suspended element and a damping structure coupled to the suspended element extends into a gap between the suspended element and the fixed part of the substrate. One or more fluid confinement structures are configured to permit movement of the damping structure within a limited portion of the gap and to confine a viscoelastic fluid to the limited portion of the gap.

A coil assembly for integration into a transducer is presented. The coil assembly may include a metal bobbin assembly, a wire coil, and one or more nonconductive printed circuit board (PCB) stiffeners. A speaker that renders micro noise in an artificial reality environment for improving simulated presence is further presented. The speaker may generate a plurality of micro noises based in part on the determined state of the virtual object. The speaker may spatialize the plurality of micro noises, such that the plurality of micro noises appears to originate from the virtual object. A speaker for speaker diaphragm motion detection using optical MEMS sensors is further presented. Optical MEMS sensors are used to optically monitor displacement of one or more portions of a speaker diaphragm. The speaker may be configured to determine that a speaker diaphragm is in rocking mode and move the speaker diaphragm out of rocking mode.

Disclosed herein are microelectronics packages and methods for manufacturing the same. The microelectronics packages may include a photonic integrated circuit (PIC), an electrical integrated circuit (EIC), and an interconnect. The interconnect may connect the EIC to the PIC. The interconnect may include a plurality of paths between the EIC and the PIC and the individual paths of the plurality of paths are less than 100 micrometers long.

An optical module includes a support layer, a device layer which is provided on the support layer, and a movable mirror which is mounted in the device layer. The device layer has a mounting region which is penetrated by the movable mirror, and a driving region which is connected to the mounting region. A space corresponding to at least the mounting region and the driving region is formed between the support layer and the device layer. A portion of the movable mirror is positioned in the space.

An acquisition and tracking sensor includes a quad detector with a narrow field of view (NFOV) and a micro-electromechanical system (MEMS) mirror with a wide field of view (WFOV). The quad detector is placed behind the MEMS mirror to produce a WFOV to allow the quad detector to scan a larger area for the incoming laser beam.

A MEMS scanning device may include: a movable MEMS mirror configured to pivot about at least one axis; at least one actuator operable to rotate the MEMS mirror about the at least one axis, each actuator out of the at least one actuator operable to bend upon actuation to move the MEMS mirror; and at least one flexible interconnect element coupled between the at least one actuator and the MEMS mirror for transferring a pulling force of the bending of the at least one actuator to the MEMS mirror. Each flexible interconnect element out of the at least one interconnect element may be an elongated structure comprising at least two turns at opposing directions, each turn greater than 120°.

A scanning device includes a planar scanning mirror disposed within a frame and having a reflective upper surface. A pair of flexures have respective first ends connected to the frame and respective second ends connected to the mirror at opposing ends of a rotational axis of the mirror. A rotor including a permanent magnet is disposed on the lower surface of the mirror. A stator includes first and second cores disposed in proximity to the rotor on opposing first and second sides of the rotational axis and first and second coils of wire wound respectively on the cores. A drive circuit drives the first and second coils with respective electrical currents including a first component selected so as to control a transverse displacement of the mirror and a second component selected so as to control a rotation of the mirror about the rotational axis.

In an example, a switchable display may include a movable pixel unit having a rotatable motive element. The movable pixel unit may further include a first display unit having a first display characteristic and disposed on a first side of the rotatable motive element. The movable pixel unit may further include a second display unit having a second display characteristic and disposed on a second side of the rotatable motive unit, different from the first side.

MEMS devices include fluid confinement structures on either a fixed part of a substrate and/or on a suspended element. The fluid confinement structures may be configured to confine a viscoelastic fluid in a limited part of a gap between one or more vertical sidewalls of both the fixed part of the substrate and either the suspended element or the drive beam or both the suspended element and drive beam such that one part of the gap is bridged by the fluid and another part of the gap is not, The structures may be configured to prevent flow of the fluid to other parts of the gap.