Abstract: Techniques are described herein that are capable of tracking an eye of a user using multiple lasers. Light from the lasers is scanned across respective partially overlapping portions of a region that includes an eye of a user during respective time periods. Portion(s) of the light that are reflected from the eye are detected by respective photodetector(s). In an example implementation, a signal corresponding to the detected portion(s) is provided in a pixel of a frame buffer based at least in part on a current angle of a mirror used to scan the light across the region. In a second implementation, digital state(s) are provided based at least in part on difference(s) between a reference signal and signal(s) corresponding to the detected portion(s), and a time value indicating a time at which a glint is detected by a photodetector is provided when a digital state triggers an interrupt handler.

Abstract: Techniques are described herein that are capable of tracking an eye of a user using multiple lasers. Light from the lasers is scanned across respective partially overlapping portions of a region that includes an eye of a user during respective time periods. Portion(s) of the light that are reflected from the eye are detected by respective photodetector(s). In an example implementation, a signal corresponding to the detected portion(s) is provided in a pixel of a frame buffer based at least in part on a current angle of a mirror used to scan the light across the region. In a second implementation, digital state(s) are provided based at least in part on difference(s) between a reference signal and signal(s) corresponding to the detected portion(s), and a time value indicating a time at which a glint is detected by a photodetector is provided when a digital state triggers an interrupt handler.

Abstract: A MEMS scanning device (“Device”) includes at least (1) laser projector(s) controlled by a laser drive to project a laser beam, (2) MEMS scanning mirror(s) controlled by a MEMS drive to scan the laser beam to generate a raster scan, (3) a display configured to receive the raster scan, (4) a thermometer configured to detect a current temperature, (5) a display observing camera configured to capture an image of a predetermined area of the display, and (6) a computer-readable media that stores temperature model(s), each of which is custom-built using machine learning. The device uses the display observing camera to capture image(s) of predetermined pattern(s), which are then used to extract feature(s). The extracted feature(s) are compared with ideal feature(s) to identify a discrepancy. When the identified discrepancy is greater than a threshold, the temperature model(s) are updated accordingly.

Abstract: A MEMS scanning device (“Device”) includes at least (1) laser projector(s) controlled by a laser drive to project a laser beam, (2) MEMS scanning mirror(s) controlled by a MEMS drive to scan the laser beam to generate a raster scan, (3) a display configured to receive the raster scan, (4) a thermometer configured to detect a current temperature, (5) a display observing camera configured to capture an image of a predetermined area of the display, and (6) a computer-readable media that stores temperature model(s), each of which is custom-built using machine learning. The device uses the display observing camera to capture image(s) of predetermined pattern(s), which are then used to extract feature(s). The extracted feature(s) are compared with ideal feature(s) to identify a discrepancy. When the identified discrepancy is greater than a threshold, the temperature model(s) are updated accordingly.

Abstract: A MEMS scanning device (“Device”) includes at least (1) laser projector(s) controlled by a laser drive to project a laser beam, (2) MEMS scanning mirror(s) controlled by a MEMS drive to scan the laser beam to generate a raster scan, (3) a display configured to receive the raster scan, (4) a thermometer configured to detect a current temperature, (5) a display observing camera configured to capture an image of a predetermined area of the display, and (6) a computer-readable media that stores temperature model(s), each of which is custom-built using machine learning. The device uses the display observing camera to capture image(s) of predetermined pattern(s), which are then used to extract feature(s). The extracted feature(s) are compared with ideal feature(s) to identify a discrepancy. When the identified discrepancy is greater than a threshold, the temperature model(s) are updated accordingly.

Abstract: Techniques are provided to re-arrange the placement of a photodiode within an illumination system to achieve improved characteristics and reduced form factor. An illumination system includes a laser assembly, a MEMS mirror system, a beam combiner, and a photodiode. The laser assembly includes RGB lasers, and the MEMS mirror system redirects laser light produced by the RGB lasers to illuminate pixels in an image frame. The beam combiner combines the laser light. The photodiode is provided to determine a power output of the laser assembly by receiving and measuring some of the laser light. The photodiode may be beneficially positioned before or after collimating optics and/or the beam combiner.

Abstract: A MEMS scanning device (“Device”) includes at least (1) laser projector(s) controlled by a laser drive to project a laser beam, (2) MEMS scanning mirror(s) controlled by a MEMS drive to scan the laser beam to generate a raster scan, (3) a display configured to receive the raster scan, (4) a thermometer configured to detect a current temperature, (5) a display observing camera configured to capture an image of a predetermined area of the display, and (6) a computer-readable media that stores temperature model(s), each of which is custom-built using machine learning. The device uses the display observing camera to capture image(s) of predetermined pattern(s), which are then used to extract feature(s). The extracted feature(s) are compared with ideal feature(s) to identify a discrepancy. When the identified discrepancy is greater than a threshold, the temperature model(s) are updated accordingly.

Abstract: A display device includes a light source, a support structure, and a scanning mirror system. The scanning mirror system includes a mirror, a first anchor located at a first lateral side of the scanning mirror system, a second anchor located at a second lateral side of the scanning mirror system, and a flexure. A first portion of the flexure extends from the first anchor toward a first longitudinal end and turns to meet a first end of the mirror. A second portion extends from the second anchor toward a second longitudinal end and turns to meet to a second end of the mirror opposite the first end. An actuator system is configured to actuate the flexure to thereby vary a scan angle of the mirror.

Abstract: A MEMS scanner may include a first flexible arm extending substantially in a forward direction and a base connected to a proximal end of the first flexible arm, the base being thicker than the first flexible arm in a vertical direction. The MEMS scanner may further include a second flexible arm connected to a distal end of the first flexible arm, the second flexible arm extending substantially in a reverse direction. The MEMS scanner may further include a mirror coupled to a distal end of the second flexible arm. In one implementation, the MEMS scanner may be a non-resonant scanner.

Abstract: Techniques are provided to reduce the form factor of laser-based systems by multi-purposing a photodiode used to help control the output of a laser. A reflective photodiode comprises a light receiving surface and a reflective coating. The light receiving surface is configured to absorb some incident light and to convert it into electrical current. The reflective coating is disposed on the light receiving surface and is configured to reflect some of the incident light away from the light receiving surface. The reflective coating also permits some of the incoming light to pass therethrough for absorption.

Abstract: A MEMS scanner may include a first flexible arm extending substantially in a forward direction and a base connected to a proximal end of the first flexible arm, the base being thicker than the first flexible arm in a vertical direction. The MEMS scanner may further include a second flexible arm connected to a distal end of the first flexible arm, the second flexible arm extending substantially in a reverse direction. The MEMS scanner may further include a mirror coupled to a distal end of the second flexible arm. In one implementation, the MEMS scanner may be a non-resonant scanner.

Abstract: A MEMS scanning device (“Device”) includes at least (1) laser projector(s) controlled by a laser drive to project a laser beam, (2) MEMS scanning mirror(s) controlled by a MEMS drive to scan the laser beam to generate a raster scan, (3) a display configured to receive the raster scan, (4) a thermometer configured to detect a current temperature, (5) a display observing camera configured to capture an image of a predetermined area of the display, and (6) a computer-readable media that stores temperature model(s), each of which is custom-built using machine learning. The device uses the display observing camera to capture image(s) of predetermined pattern(s), which are then used to extract feature(s). The extracted feature(s) are compared with ideal feature(s) to identify a discrepancy. When the identified discrepancy is greater than a threshold, the temperature model(s) are updated accordingly.

Abstract: Variable attenuation of an illumination source is provided by an aperture (i.e., an opening in a structure through which light passes) that is sandwiched between two tunable lenses that are configured to apply varying amounts of optical power. A controller operates the first tunable lens to apply optical power to the light to be divergent at the aperture structure so that a portion of the light is clipped. Varying the applied optical power at the first tunable lens can increase or decrease divergence at the aperture structure to thereby increase or decrease clipping and the attenuation of the light. The controller operates the second tunable lens to compensate for changes in light state at the first tunable lens by applying opposite optical power so that collimated light from the illumination source which enters the first tunable lens may exit the second tunable lens in the same collimated state.

Abstract: Examples are disclosed that relate to scanning display systems. One example provides a display device comprising a controller, a light source, and a scanning mirror system. The scanning mirror system comprises a scanning mirror configured to scan light from the light source in at least one direction at a resonant frequency of the scanning mirror, and an electromechanical actuator system coupled with the scanning mirror and being controllable by the controller to adjust the resonant frequency of the scanning mirror.

Abstract: Techniques are described herein that are capable of tracking an eye of a user using multiple lasers. Light from the lasers is scanned across respective partially overlapping portions of a region that includes an eye of a user during respective time periods. Portion(s) of the light that are reflected from the eye are detected by respective photodetector(s). In an example implementation, a signal corresponding to the detected portion(s) is provided in a pixel of a frame buffer based at least in part on a current angle of a mirror used to scan the light across the region. In a second implementation, digital state(s) are provided based at least in part on difference(s) between a reference signal and signal(s) corresponding to the detected portion(s), and a time value indicating a time at which a glint is detected by a photodetector is provided when a digital state triggers an interrupt handler.

Abstract: A display system for presenting visual information to a user includes a fast scan mirror, a slow scan mirror, and anamorphic relay optics positioned optically between the fast scan mirror and slow scan mirror. The fast scan mirror has a fast scan arc in a scan direction of a display light provided by a light source. The slow scan mirror has a slow scan arc in a cross-scan direction of the display light that is perpendicular to the scan direction. The anamorphic relay optics are configured to magnify the display light in the cross-scan direction.

Abstract: A display system includes a waveguide having a first diffractive optical element and a second diffractive optical element. The waveguide is configured to receive a display light having a pupil height and pupil width and transmit the display light to an eyebox with an eyebox height and an eyebox width. The first diffractive optical element is configured to in-couple the display light into the waveguide, the first diffractive optical element having a first diffractive optical element height that is at least the pupil height and a first diffractive optical element width that is at least the eyebox width.

Abstract: Examples are disclosed that relate to actuator frames for scanning mirror systems. In one example an actuator frame for a scanning mirror assembly comprises a mounting member comprising a first side and an opposite second side. A first moveable member comprises a first interior side that defines a first gap and a second gap with the first side of the mounting member. A second moveable member comprises a second interior side that defines a third gap and a fourth gap with the second side of the mounting member. A first hinge connects a central portion of the mounting member with the first moveable member, and a second hinge connects the central portion of the mounting member with the second moveable member.

Abstract: Techniques are provided to re-arrange the placement of a photodiode within an illumination system to achieve improved characteristics and reduced form factor. An illumination system includes a laser assembly, a MEMS mirror system, a beam combiner, and a photodiode. The laser assembly includes RGB lasers, and the MEMS mirror system redirects laser light produced by the RGB lasers to illuminate pixels in an image frame. The beam combiner combines the laser light. The photodiode is provided to determine a power output of the laser assembly by receiving and measuring some of the laser light. The photodiode may be beneficially positioned before or after collimating optics and/or the beam combiner.

Abstract: A display system includes a first light source, a second light source, at least one movable mirror, and an attenuator. The first light source is configured to provide a first light in a first optical path. The second light source is configured to provide a second light in a second optical path. A portion of the second optical path overlaps the first optical path in an overlapping portion. The attenuator is positioned in at least the first optical path and configured to attenuate at least the first light. The movable mirror is movable to deflect the overlapping portion.