PATENT DOCUMENT

Publication Number: US-11860439-B1
Application Number: US-202117202198-A
Country: US
Kind Code: B1

Title: Head-mounted electronic device with alignment sensors

Abstract:
A head-mounted device may have a head-mounted housing. Optical components may be supported by the head-mounted housing. The optical components may include cameras such as front-facing cameras and/or movable optical modules that have displays for displaying images to eye boxes. Sensors may be provided in the head-mounted device to detect changes in orientation between respective optical modules, between respective portions of a chassis, display cover layer, or other head-mounted support structure in the housing, between optical components such as cameras, and/or between optical components and housing structures. Information from these sensors can be used to measure image misalignment such as image misalignment associated with misaligned cameras or misalignment between optical module images and corresponding eye boxes.

Claims:
What is claimed is: 
     
       1. A head-mounted device, comprising:
 a head-mounted housing; 
 a camera configured to capture images; 
 first and second optical modules supported in the head-mounted housing, wherein each of the first and second optical modules has a display and has a lens and wherein the display is configured to display the images; 
 a sensor that is configured to measure misalignment between the first and second optical modules; and 
 control circuitry configured to compensate the images for the measured misalignment. 
 
     
     
       2. The head-mounted device defined in  claim 1  further comprising actuators configured to move the first and second optical modules, wherein the sensor comprises a sensor selected from the group consisting of: an optical sensor, an ultrasonic sensor, a radio-frequency sensor, and a strain gauge and wherein the control circuitry is configured to compensate for the measured misalignment by applying an image warping to at least one of: a first image associated with the display of the first optical module and a second image associated with the display of the second optical module. 
     
     
       3. The head-mounted device defined in  claim 2  wherein the head-mounted housing comprises polymer and wherein the sensor comprises a strain gauge formed from a metal trace on an area of the polymer selectively exposed to light to define a pattern for the metal trace. 
     
     
       4. The head-mounted device defined in  claim 1  wherein the sensor comprises a strain gauge embedded between first and second layers of material. 
     
     
       5. The head-mounted device defined in  claim 1  wherein the sensor comprises a laser interferometer sensor. 
     
     
       6. The head-mounted device defined in  claim 1  wherein the sensor comprises a light emitter configured to emit a beam of light and a light detector configured to detect the emitted beam of light. 
     
     
       7. The head-mounted device defined in  claim 1  wherein the sensor comprises a time-of-flight sensor. 
     
     
       8. The head-mounted device defined in  claim 1  wherein the sensor comprises a resistive sensor. 
     
     
       9. The head-mounted device defined in  claim 1  wherein the sensor comprises a magnetic sensor. 
     
     
       10. The head-mounted device defined in  claim 1  wherein the head-mounted device further comprises a pixel array, wherein the head-mounted housing comprises a display cover layer overlapping the pixel array, and wherein the sensor is attached to the display cover layer. 
     
     
       11. The head-mounted device defined in  claim 1  wherein the sensor comprises a scanning light beam sensor. 
     
     
       12. The head-mounted device defined in  claim 1  wherein the sensor comprises an optical sensor that emits a beam of light that reflects from at least two surfaces. 
     
     
       13. A head-mounted device, comprising:
 a head-mounted housing;
 movable optical modules supported in the head-mounted housing, wherein each of the movable optical modules has a display and a has a lens configured to present an image from the display to a corresponding eye box; 
 a first sensor configured to measure changes in position between the head-mounted housing and a given one of the movable optical modules; 
 a second sensor configured to measure changes in position between portions of the head-mounted housing; and 
 control circuitry configured to compensate the images presented by the movable optical modules for misalignment relative to the eye boxes based on information from the first and second sensors. 
 
 
     
     
       14. The head-mounted device defined in  claim 13  wherein the first sensor comprises a sensor selected from the group consisting of: a resistive sensor, a magnetic sensor, an optical sensor, an ultrasonic sensor, a radio-frequency sensor, and a strain gauge. 
     
     
       15. The head-mounted device defined in  claim 13  wherein the second sensor comprises a sensor selected from the group consisting of: a resistive sensor, a magnetic sensor, an optical sensor, an ultrasonic sensor, a radio-frequency sensor, and a strain gauge. 
     
     
       16. The head-mounted device defined in  claim 13  wherein the head-mounted housing comprises a transparent housing layer and wherein the second sensor is configured to measure changes in position between first and second portions of the transparent housing layer. 
     
     
       17. The head-mounted device defined in  claim 16  wherein the head-mounted housing has opposing front and rear faces, wherein the transparent housing layer comprises a display cover layer on the front face, wherein the head-mounted device comprises a pixel array overlapped by the display cover layer. 
     
     
       18. The head-mounted device defined in  claim 13  further comprising front-facing cameras mounted to the optical modules. 
     
     
       19. A head-mounted device, comprising:
 a head-mounted support structure; 
 a first optical component supported by the head-mounted support structure; 
 a second optical component supported by the head-mounted support structure; 
 an optical interferometer sensor configured to measure misalignment between the first and second optical components, wherein the optical interferometer sensor comprises a beam splitter that splits light into first and second light beams, and wherein the optical interferometer sensor is configured to measure a relative phase of the first and second light beams; and 
 control circuitry configured to compensate for the misalignment between the first and second optical components measured with the optical interferometer sensor by applying an image warping to at least one of: a first image associated with the first optical component and a second image associated with the second optical component. 
 
     
     
       20. The head-mounted device defined in  claim 19  wherein the first and second optical components comprise respective first and second cameras. 
     
     
       21. The head-mounted device defined in  claim 19  wherein the first and second optical components comprise respective first and second optical modules each having a display and a lens that is configured to provide an image from the display to a corresponding eye box.

Description:
This application claims the benefit of provisional patent application No. 63/020,630, filed May 6, 2020, which is hereby incorporated by reference herein in its entirety. 
    
    
     FIELD 
     This relates generally to electronic devices, and, more particularly, to electronic devices such as head-mounted devices. 
     BACKGROUND 
     Electronic devices such as head-mounted devices may have displays for displaying images and may have other optical components. 
     SUMMARY 
     A head-mounted device may have a head-mounted housing. Optical components may be supported by the head-mounted housing. The optical components may include cameras such as front-facing cameras and/or optical modules that have displays for displaying images to eye boxes. 
     Sensors may be provided in the head-mounted device to detect changes in position between portions of the head-mounted device. These changes may include changes in the positions between optical modules, between portions of a chassis, display cover layer, or other head-mounted support structure, between optical components such as cameras, and/or between optical components and housing structures. Information from these sensors can be used to measure image misalignment such as image misalignment associated with misaligned cameras or image misalignment between optical module images and the eye boxes to which these images are being provided. During operation of the head-mounted device, images can be warped to compensate for measured misalignment. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a top view of an illustrative head-mounted device in accordance with an embodiment. 
         FIG.  2    is a rear view of an illustrative head-mounted device in accordance with an embodiment. 
         FIG.  3    is a schematic diagram of an illustrative head-mounted device in accordance with an embodiment. 
         FIG.  4    is a top view of an illustrative head-mounted device in an undeformed configuration in accordance with an embodiment. 
         FIG.  5    is a top view of the illustrative head-mounted device of  FIG.  4    in a deformed configuration in accordance with an embodiment. 
         FIG.  6    is a side view of an illustrative resistance-based sensor in accordance with an embodiment. 
         FIG.  7    is a side view of an illustrative sensor that emits signals and detects reflected signals in accordance with an embodiment. 
         FIG.  8    is a side view of an illustrative optical sensor such as a scanning light beam sensor that monitors a pattern in accordance with an embodiment. 
         FIGS.  9 ,  10 , and  11    are cross-sectional side views of illustrative strain gauge sensors in accordance with embodiments. 
         FIG.  12    is a side view of an illustrative magnetic sensor in accordance with an embodiment. 
         FIG.  13    is a cross-sectional side view of an illustrative sensor that uses time-of-flight measurements in accordance with an embodiment. 
         FIG.  14    is a cross-sectional side view of an illustrative head-mounted device structure being monitored by a sensor such as a time-of-flight sensor or other sensor in accordance with an embodiment. 
         FIG.  15    is a cross-sectional side view of an illustrative sensor arrangement with a light beam that reflects from reflective surfaces in a head-mounted device in accordance with an embodiment. 
         FIG.  16    is a diagram of an illustrative optical sensor such as an optical interferometer sensor in accordance with an embodiment. 
         FIG.  17    is a diagram of illustrative optical sensing components such as prisms in accordance with an embodiment. 
         FIG.  18    is a cross-sectional side view of a portion of a head-mounted device with sensors in accordance with an embodiment. 
         FIG.  19    is a perspective view of an illustrative sensor arrangement for an electronic device in accordance with an embodiment. 
         FIG.  20    is a top view of an illustrative head-mounted device with sensors in accordance with an embodiment. 
         FIG.  21    is a flow chart of illustrative operations associated with operating an electronic device in accordance with an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     An electronic device such as a head-mounted device may have a front face that faces away from a user&#39;s head and may have an opposing rear face that faces the user&#39;s head. Optical modules may be used to provide images to a user&#39;s eyes. The positions of the optical modules may be adjusted to accommodate different user interpupillary distances. The head-mounted device may have actuators and optical module guide structures to allow the optical module positions to be adjusted. The head-mounted device may also have other optical components such as front-facing cameras. 
     A top view of an illustrative head-mounted device is shown in  FIG.  1   . As shown in  FIG.  1   , head-mounted devices such as electronic device  10  may have head-mounted support structures such as housing  12 . Housing  12  may include portions (e.g., head-mounted support structures  12 T) to allow device  10  to be worn on a user&#39;s head. Support structures  12 T may be formed from fabric, polymer, metal, and/or other material. Support structures  12 T may form a strap or other head-mounted support structures to help support device  10  on a user&#39;s head. A main support structure (e.g., a head-mounted housing such as main housing portion  12 M) of housing  12  may support electronic components such as displays  14 . 
     Main housing portion  12 M may include housing structures formed from metal, polymer, glass, ceramic, and/or other material. For example, housing portion  12 M may have housing walls on front face F and housing walls on adjacent top, bottom, left, and right side faces that are formed from rigid polymer or other rigid support structures and these rigid walls may optionally be covered with electrical components, fabric, leather, or other soft materials, etc. Housing portion  12 M may also have internal support structures such as a frame and/or structures that perform multiple functions such as controlling airflow and dissipating heat while providing structural support. The walls of housing portion  12 M may enclose internal components  38  in interior region  34  of device  10  and may separate interior region  34  from the environment surrounding device  10  (exterior region  36 ). Internal components  38  may include integrated circuits, actuators, batteries, sensors, and/or other circuits and structures for device  10 . Housing  12  may be configured to be worn on a head of a user and may form glasses, a hat, a helmet, goggles, and/or other head-mounted device. Configurations in which housing  12  forms goggles may sometimes be described herein as an example. 
     Front face F of housing  12  may face outwardly away from a user&#39;s head and face. Opposing rear face R of housing  12  may face the user. Portions of housing  12  (e.g., portions of main housing  12 M) on rear face R may form a cover such as cover  12 C. The presence of cover  12 C on rear face R may help hide internal housing structures, internal components  38 , and other structures in interior region  34  from view by a user. 
     Device  10  may have one or more cameras such as cameras  46  of  FIG.  1   . For example, forward-facing (front-facing) cameras may allow device  10  to monitor movement of the device  10  relative to the environment surrounding device  10  (e.g., the cameras may be used in forming a visual odometry system or part of a visual inertial odometry system). Forward-facing cameras may also be used to capture images of the environment that are displayed to a user of the device  10 . If desired, images from multiple forward-facing cameras may be merged with each other and/or forward-facing camera content can be merged with computer-generated content for a user. 
     Device  10  may have any suitable number of cameras  46 . For example, device  10  may have K cameras, where the value of K is at least one, at least two, at least four, at least six, at least eight, at least ten, at least 12, less than 20, less than 14, less than 12, less than ten, 4-10, or other suitable value. Cameras  46  may be sensitive at infrared wavelengths (e.g., cameras  46  may be infrared cameras), may be sensitive at visible wavelengths (e.g., cameras  46  may be visible cameras), and/or cameras  46  may be sensitive at other wavelengths. If desired, cameras  46  may be sensitive at both visible and infrared wavelengths. 
     Cameras  46  that are mounted on front face F and that face outwardly (towards the front of device  10  and away from the user) may sometimes be referred to herein as forward-facing or front-facing cameras. Cameras  46  may capture visual odometry information, image information that is processed to locate objects in the user&#39;s field of view (e.g., so that virtual content can be registered appropriately relative to real-world objects), image content that is displayed in real time for a user of device  10 , and/or other suitable image data. 
     Device  10  may have left and right optical modules  40 . Optical modules  40  support electrical and optical components such as light-emitting components and lenses and may therefore sometimes be referred to as optical assemblies, optical systems, optical component support structures, lens and display support structures, electrical component support structures, or housing structures. Each optical module may include a respective display  14 , lens  30 , and support structure such as support structure  32 . Support structure  32 , which may sometimes be referred to as a lens support structure, optical component support structure, optical module support structure, optical module portion, or lens barrel, may include hollow cylindrical structures with open ends or other supporting structures to house displays  14  and lenses  30 . Support structures  32  may, for example, include a left lens barrel that supports a left display  14  and left lens  30  and a right lens barrel that supports a right display  14  and right lens  30 . 
     Displays  14  may include arrays of pixels or other display devices to produce images. Displays  14  may, for example, include organic light-emitting diode pixels formed on substrates with thin-film circuitry and/or formed on semiconductor substrates, pixels formed from crystalline semiconductor dies, liquid crystal display pixels, scanning display devices, and/or other display devices for producing images. 
     Lenses  30  may include one or more lens elements for providing image light from displays  14  to respective eyes boxes  13 . Lenses may be implemented using refractive glass lens elements, using mirror lens structures (catadioptric lenses), using Fresnel lenses, using holographic lenses, and/or other lens systems. 
     When a user&#39;s eyes are located in eye boxes  13 , displays (display panels)  14  operate together to form a display for device  10  (e.g., the images provided by respective left and right optical modules  40  may be viewed by the user&#39;s eyes in eye boxes  13  so that a stereoscopic image is created for the user). The left image from the left optical module fuses with the right image from a right optical module while the display is viewed by the user. 
     It may be desirable to monitor the user&#39;s eyes while the user&#39;s eyes are located in eye boxes  13 . For example, it may be desirable to use a camera to capture images of the user&#39;s irises (or other portions of the user&#39;s eyes) for user authentication. It may also be desirable to monitor the direction of the user&#39;s gaze. Gaze tracking information may be used as a form of user input and/or may be used to determine where, within an image, image content resolution should be locally enhanced in a foveated imaging system. To ensure that device  10  can capture satisfactory eye images while a user&#39;s eyes are located in eye boxes  13 , each optical module  40  may be provided with a camera such as camera  42  and one or more light sources such as light-emitting diodes  44  or other light-emitting devices such as lasers, lamps, etc. Cameras  42  and light-emitting diodes  44  may operate at any suitable wavelengths (visible, infrared, and/or ultraviolet). As an example, diodes  44  may emit infrared light that is invisible (or nearly invisible) to the user. This allows eye monitoring operations to be performed continuously without interfering with the user&#39;s ability to view images on displays  14 . 
     Not all users have the same interpupillary distance IPD. To provide device  10  with the ability to adjust the interpupillary spacing between modules  40  along lateral dimension X and thereby adjust the spacing IPD between eye boxes  13  to accommodate different user interpupillary distances, device  10  may be provided with optical module positioning systems in housing  12 . The positioning systems may have guide members and actuators  43  that are used to position optical modules  40  with respect to each other. 
     Actuators  43  can be manually controlled and/or computer-controlled actuators (e.g., computer-controlled motors) for moving support structures (lens barrels)  32  relative to each other. Information on the locations of the user&#39;s eyes may be gathered using, for example, cameras  42 . The locations of eye boxes  13  can then be adjusted accordingly. 
     As shown in the rear view of device  10  of  FIG.  2   , cover  12 C may cover rear face R while leaving lenses  30  of optical modules  40  uncovered (e.g., cover  12 C may have openings that are aligned with and receive modules  40 ). As modules  40  are moved relative to each other along dimension X to accommodate different interpupillary distances for different users, modules  40  move relative to fixed housing structures such as the walls of main portion  12 M and move relative to each other. 
     A schematic diagram of an illustrative electronic device such as a head-mounted device or other wearable device is shown in  FIG.  3   . Device  10  of  FIG.  3    may be operated as a stand-alone device and/or the resources of device  10  may be used to communicate with external electronic equipment. As an example, communications circuitry in device  10  may be used to transmit user input information, sensor information, and/or other information to external electronic devices (e.g., wirelessly or via wired connections). Each of these external devices may include components of the type shown by device  10  of  FIG.  3   . 
     As shown in  FIG.  3   , a head-mounted device such as device  10  may include control circuitry  20 . Control circuitry  20  may include storage and processing circuitry for supporting the operation of device  10 . The storage and processing circuitry may include storage such as nonvolatile memory (e.g., flash memory or other electrically-programmable-read-only memory configured to form a solid-state drive), volatile memory (e.g., static or dynamic random-access-memory), etc. Processing circuitry in control circuitry  20  may be used to gather input from sensors and other input devices and may be used to control output devices. The processing circuitry may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors and other wireless communications circuits, power management units, audio chips, application specific integrated circuits, etc. During operation, control circuitry  20  may use display(s)  14  and other output devices in providing a user with visual output and other output. 
     To support communications between device  10  and external equipment, control circuitry  20  may communicate using communications circuitry  22 . Circuitry  22  may include antennas, radio-frequency transceiver circuitry, and other wireless communications circuitry and/or wired communications circuitry. Circuitry  22 , which may sometimes be referred to as control circuitry and/or control and communications circuitry, may support bidirectional wireless communications between device  10  and external equipment (e.g., a companion device such as a computer, cellular telephone, or other electronic device, an accessory such as a point device, computer stylus, or other input device, speakers or other output devices, etc.) over a wireless link. For example, circuitry  22  may include radio-frequency transceiver circuitry such as wireless local area network transceiver circuitry configured to support communications over a wireless local area network link, near-field communications transceiver circuitry configured to support communications over a near-field communications link, cellular telephone transceiver circuitry configured to support communications over a cellular telephone link, or transceiver circuitry configured to support communications over any other suitable wired or wireless communications link. Wireless communications may, for example, be supported over a Bluetooth® link, a WiFi® link, a wireless link operating at a frequency between 10 GHz and 400 GHz, a 60 GHz link, or other millimeter wave link, a cellular telephone link, or other wireless communications link. Device  10  may, if desired, include power circuits for transmitting and/or receiving wired and/or wireless power and may include batteries or other energy storage devices. For example, device  10  may include a coil and rectifier to receive wireless power that is provided to circuitry in device  10 . 
     Device  10  may include input-output devices such as devices  24 . Input-output devices  24  may be used in gathering user input, in gathering information on the environment surrounding the user, and/or in providing a user with output. Devices  24  may include one or more displays such as display(s)  14 . Display(s)  14  may include one or more display devices such as organic light-emitting diode display panels (panels with organic light-emitting diode pixels formed on polymer substrates or silicon substrates that contain pixel control circuitry), liquid crystal display panels, microelectromechanical systems displays (e.g., two-dimensional mirror arrays or scanning mirror display devices), display panels having pixel arrays formed from crystalline semiconductor light-emitting diode dies (sometimes referred to as microLEDs), and/or other display devices. 
     Sensors  16  in input-output devices  24  may include force sensors (e.g., strain gauges, capacitive force sensors, resistive force sensors, etc.), audio sensors such as microphones, touch and/or proximity sensors such as capacitive sensors such as a touch sensor that forms a button, trackpad, or other input device), and other sensors. If desired, sensors  16  may include optical sensors such as optical sensors that emit and detect light, ultrasonic sensors, optical touch sensors, optical proximity sensors, and/or other touch sensors and/or proximity sensors, monochromatic and color ambient light sensors, image sensors (e.g., cameras), fingerprint sensors, iris scanning sensors, retinal scanning sensors, and other biometric sensors, temperature sensors, sensors for measuring three-dimensional non-contact gestures (“air gestures”), pressure sensors, sensors for detecting position, orientation, and/or motion (e.g., accelerometers, magnetic sensors such as compass sensors, gyroscopes, and/or inertial measurement units that contain some or all of these sensors), health sensors such as blood oxygen sensors, heart rate sensors, blood flow sensors, and/or other health sensors, radio-frequency sensors, three-dimensional camera systems such as depth sensors (e.g., structured light sensors and/or depth sensors based on stereo imaging devices that capture three-dimensional images) and/or optical sensors such as self-mixing sensors and light detection and ranging (lidar) sensors that gather time-of-flight measurements (e.g., time-of-flight cameras), humidity sensors, moisture sensors, gaze tracking sensors, electromyography sensors to sense muscle activation, facial sensors, interferometric sensors, time-of-flight sensors, magnetic sensors, resistive sensors, distance sensors, angle sensors, and/or other sensors. In some arrangements, device  10  may use sensors  16  and/or other input-output devices to gather user input. For example, buttons may be used to gather button press input, touch sensors overlapping displays can be used for gathering user touch screen input, touch pads may be used in gathering touch input, microphones may be used for gathering audio input (e.g., voice commands), accelerometers may be used in monitoring when a finger contacts an input surface and may therefore be used to gather finger press input, etc. 
     If desired, electronic device  10  may include additional components (see, e.g., other devices  18  in input-output devices  24 ). The additional components may include haptic output devices, actuators for moving movable housing structures, audio output devices such as speakers, light-emitting diodes for status indicators, light sources such as light-emitting diodes that illuminate portions of a housing and/or display structure, other optical output devices, and/or other circuitry for gathering input and/or providing output. Device  10  may also include a battery or other energy storage device, connector ports for supporting wired communication with ancillary equipment and for receiving wired power, and other circuitry. 
     It is desirable for optical components in device  10  to remain in satisfactory alignment during operation of device  10 . Consider, as an example, optical modules  40  and front facing cameras  46 . Due to a drop event or other event imparting stress on housing portion  12 M, housing portion  12 M and the components of housing portion  12 M may become deformed and misaligned. For example, the left and right optical modules  40  in device  10  may become misaligned and/or a pair of front-facing cameras  46  may become misaligned. This can adversely affect device performance. For example, if the left and right images being viewed by a user become misaligned with respect to each other, these images may not fuse satisfactorily in the user&#39;s vision and/or a user may experience discomfort during image viewing. Similarly, misalignment of cameras  46  can lead to undesired misalignment between captured images. 
     To ensure that device  10  is comfortable to wear on a user&#39;s head, device  10  should not be too heavy or too large. Particularly when using lightweight and compact structures to form device  10 , however, there is a risk that excessive stress on the structures of device  10  will adversely affect the alignment of optical components of device  10 . To accommodate potential optical component misalignment, device  10  may be provided with sensors that can measure misalignment. 
     Consider, as an example, head-mounted device  10  of  FIG.  4   . In the configuration of  FIG.  4   , device  10  has been provided with sensor  16  (e.g., a strain gauge or other sensor). Sensor  16  may, as an example, be coupled to a portion of housing  12 M. During operation, sensor  16  can detect when housing  12 M has become deformed (e.g., bent) due to a drop event or other stress. As shown in  FIG.  4   , optical modules  40  provide left and right images to corresponding left and right eye boxes  30  in directions  50  and left and right forward-facing cameras  46  capture corresponding left and right camera images. When housing  12 M of  FIG.  4    is not deformed as shown in  FIG.  4   , the images provided by optical modules  40  in directions  50  are aligned with eye boxes  30 , so images for the left and right eyes fuse properly into a single image when viewed by the user&#39;s left and right eyes. Cameras  46  are also aligned satisfactorily. 
     When housing  12 M is deformed as shown in  FIG.  5   , however, the images provided in directions  50  are no longer aligned with eye boxes  30  and/or the images captured by cameras  46  are no longer aligned satisfactorily. Due to the presence of sensors such as sensor  16 , image misalignment associated with display images and/or camera images can be detected in real time and appropriate compensating action taken. As an example, if it is determined that an image from a given optical module  40  is rotated with respect to a corresponding eye box  30 , device  10  (e.g., control circuitry in device  10  such as control circuitry  20  of  FIG.  3   ) may apply a corresponding image warping process with a corresponding counterrotation to the image being produced by that optical module. This ensures that the images from optical modules  40  are properly aligned with eye boxes  30  and each other, even if optical modules have become physically misaligned. Similarly, images captured by forward facing cameras  46  may be processed to compensate for detected misalignment between the cameras. Configurations where misalignment between cameras and optical modules and/or other optical component misalignment is detected and compensated may also be used. 
     One or more sensors may be provided to gather information on the positions of structures in device  10 . These sensors can produce output that is used in detecting misalignment and may therefore sometimes be referred to as misalignment sensors, position sensors, and/or orientation sensors. The sensors may be strain gauges, optical sensors, radio-frequency sensors, acoustic sensors, magnetic sensors, and/or other sensors that detect deformation of housing  12 M and/or other portions of device  10  leading to misalignment of optical components with respect to each other and/or to housing  12 . 
     Using a misalignment sensor, the orientation of housing  12 M and/or one or more optical components in housing  12 M such as optical modules  40  and/or cameras  46  can be measured. Control circuitry  20  can process the output from one or more orientation sensors in real time and can take suitable action to compensate for the effects of optical component misalignment. As an example, control circuitry  20  can warp or otherwise modify image data (e.g., display output data associated with one or more optical module displays, captured camera images from one or more cameras, etc.) to digitally compensate for misalignment. During image warping, an image is geometrically distorted (e.g., a geometrical image transform is applied to the image such as a shift, shear, rotation, etc.). In this way, device  10  can be operated satisfactorily, even if optical components in device  10  have become misaligned. 
     Illustrative misalignment sensor configurations are shown in  FIGS.  6 - 20   . 
     In the example of  FIG.  6   , misalignment sensor  16  has a first portion  16 - 1  and a second portion  16 - 2 . Shaft  16 - 2 ′ of portion  16 - 2  moves in and out of portion  16 - 1  as the distance D between portions  16 - 1  and  16 - 2  varies. Sensor  16  may be, for example, a resistance-based sensor (e.g., a potentiometer) that is characterized by a resistance R between its terminals  52  that is proportional to distance D. Resistance-based sensors and other misalignment sensors  16  may be configured to measure changes in displacement (e.g., distance D) and/or changes in angular orientation that are indicative of component movement and/or housing deformation and that are therefore indicative of associated image misalignment. 
     In the example of  FIG.  7   , sensor  16  has an emitter  54  and a detector  56  for detecting misalignment between structures in device  10  such as structure  64  and structure  62 . Emitter  54  may emit signals  58  (e.g., light, radio-frequency signals, acoustic signals such as ultrasonic signals, etc.). Emitted signals  58  reflect from a reflective surface of structure in device  10  such as structure  62  (e.g., a portion of an optical module, a housing structure, a portion of a camera, etc.). Emitted signals  58  that have reflected from structure  62  such as reflected signals  60  are detected by detector  56 . The strength of the reflected signals in this example is proportional to distance D and can therefore be used by device  10  (e.g., by sensor  16  and/or control circuitry  20 ) to measure changes to distance D and/or changes in the angle between structures in device  10 . 
     In the example of  FIG.  8   , scanning light beam sensor  16  has a patterned target such as target  70 . Sensor  16  of  FIG.  8    is used in detecting changes in the angular orientation between structures  80  and  82 . Patterned target  70 , which may sometimes be referred to as a target, pattern, fiducial, etc., may include, for example, a bar code or other recognizable pattern. Sensor  16  may include a light emitter such as scanning light beam emitter  74 . Emitter  74  may be a scanning laser device or other devices that emits a beam of light  76  that is scanned across target  70  in directions  78 . Detector  72  detects corresponding reflected light. Because of the recognizable pattern of target  70 , lateral shifts in the position of target  70  can be detected. Sensor  16  can thereby detect when the angle between structures  80  and  82  has changed (e.g., because structure  80  has shifted laterally in direction  85 ). 
     If desired, a misalignment sensor may include a strain gauge.  FIG.  9    is a cross-sectional side view of an illustrative strain gauge formed from conductive trace  84  (e.g., a conductive trace with a serpentine path). Trace  84  is supported by one or more structures in device  10  (e.g., portions of housing  12 , optical modules  40 , cameras  46 , etc.). When trace  84  bends, the effective length of trace  84  and therefore the resistance of trace  84  changes. A Wheatstone bridge or other resistance measurement circuitry that is coupled to the terminals of trace  84  may be used by control circuitry  20  to measure strain. 
     In the example of  FIG.  9   , strain gauge metal trace  84  has been formed using a laser activation process. This process, which may sometimes be referred to as laser direct structuring, involves exposing laser activatable material such as material  86  (e.g., polymer with sensitizers or other material that is sensitized to light exposure) to laser light in a desired trace pattern, followed by electrodeposition to grow trace  84  in the exposed areas. Material  86  may be formed from a different material than other structures in device  10  (e.g. material  86  may be a first shot of polymer and supporting material  88  may be a second shot of polymer that forms a portion of housing  12  and/or other structure in a head-mounted device) or a single material may be used in forming these structures. In the example of  FIG.  10   , strain gauge trace  84  has been formed on layer  90 . Layer  90  may be a layer on structure  88  (e.g., a dielectric coating layer, a layer of light-sensitive polymer, a flexible printed circuit substrate or other substrate that is attached to structure  88  using adhesive, welds, fasteners, and/or other attachment mechanisms, etc.). 
       FIG.  11    is a cross-sectional side view of an illustrative structure in device  10  (structure  88 ) showing how a sensor such as strain gauge may be embedded within the structure. Structure  88  may, as an example, have portions  88 M (e.g., metal portions) and portions  88 I (e.g., insulating portions formed from polymer or other dielectric). Sensor  16  may be a strain gauge formed from strain gauge trace  84  (e.g., a metal trace) formed in insulator  90  (e.g. a layer of polymer sandwiched between layers  88 I). In general, strain gauge sensors may be embedded within structures such as structure  88  forming housing  12 , forming optical component packages (e.g., portions of optical modules  40 , portions of cameras  46 ), and/or other structures in device  10 . 
       FIG.  12    is a cross-sectional side view of an illustrative magnetic sensor. Sensor  16  includes a permanent magnet such as magnet  94  and a magnetic sensing device such as a Hall effect sensor or other sensor that can measure magnetic fields (e.g. magnetic sensor  92 ). The measured magnetic field strength at sensor  92  is a function of distance D between magnet  94  and sensor  92 , thereby allowing sensor  16  to measure distance D (as an example). 
     Time-of-flight measurements may be made using sensor  16 , if desired. Consider, as an example, sensor  16  of  FIG.  13   . Sensor  16  of  FIG.  13    includes a signal emitter such as source  96  and a signal sensor such as detector  98 . During operation, source  96  emits signal  102  (e.g., a pulse) and detects reflected signal  104  (e.g., the pulse following reflection of the pulse from the surface of structure  110  in device  10  (e.g., a portion of support structure  12 , optical modules  40 , cameras  46 , or other structure in device  10 ). The emitted signal from source  96  may be an optical signal (light), an acoustic signal (sound such as an ultrasonic acoustic signal), or a radio-frequency signal (e.g., a signal having a frequency of 1 MHz-100 GHz or other suitable radio frequency). Detector  98  (e.g., a photodetector sensitive to light, a microphone sensitive to sound, or an antenna sensitive to radio-frequency signals) measures the time at which reflected signal  104  is received relative to the time at which source  96  emitted signal  102 . Using the known speed of propagation of signals  102  and  104  and the measured time of flight of the emitted signal (e.g., the time between pulse transmission and pulse reception), sensor  16  and/or control circuitry  20  can determine the distance D between sensor  16  and structure  100 . 
     If desired, a front-facing display and/or other components (e.g., a touch sensor layer) may be provided on front face F. For example, housing portion  12 M may include a display cover layer that forms a front member that covers front face F. As shown in  FIG.  14   , a display cover layer (e.g., a display cover layer with a curved cross-sectional profile or other suitable shape) such as display cover layer  106  (e.g., a front portion of housing portion  12 M) may overlap a pixel array such as pixel array  108  (sometimes referred to as a display, display layer, display panel, etc.). Pixel array  108  may be a liquid crystal display panel, an organic light-emitting display panel, a display panel with other light-emitting diodes, etc. 
     Display cover layer  106  may be formed from a layer of glass, clear polymer, or other transparent material that allows pixel array  108  to be viewed through display cover layer  106 . During operation, pixel array  108  may be used in presenting images on front face F (e.g., images that are viewable by the user when device  10  is not being worn on the user&#39;s head and images that are viewable by nearby people when device  10  is being worn on the user&#39;s head). To detect bending of display cover layer  106 , which may cause cameras  46  or other optical components mounted on or adjacent to display cover layer  106  to become misaligned with respect to each other or which may be indicative of bending of housing portion  12 M that causes optical modules  40  to become misaligned with respect to each other and/or with respect to cameras  46 , display cover layer  106  may be provided with one or more sensors such as sensor  16 . 
     Sensor  16  on display cover layer  106  of  FIG.  14    may be, for example, a time-of-flight sensor having a signal emitter such as source  96  and a signal detector such as detector  98 . During measurement operations, control circuitry  20  may use source  96  to emit signal  102 . Signal  102  may reflect from reflector  110  as reflected signal  104 , which is detected by detector  98 . Reflector  110  may be a structure in housing portion  12 M such as a portion of display cover layer  106  or a mirror or other structure that is attached to display cover layer  106 . The time of flight of the signal from source  96  to reflector  110  and back to detector  98  may be used to compute distance D (e.g., the distance separation different portions of housing portion  12 M such as different left and right side portions or top and bottom portions of display cover layer  106 ). If bending or other deformation of display cover layer  106  that is associated with image misalignment is detected, compensating adjustments may be made by control circuitry  20 . 
     In the illustrative configuration of  FIG.  15   , sensor  16  has a light source such as source  112 . Light source  112  may be, for example, a light-emitting diode or a laser that emits a beam of light such as light beam  118 . Device  10  may be configured so that light beam  118  reflects from multiple structures in housing portion  12 M (e.g., multiple reflectors  116 ) before being detected by detector  114  of sensor  16 . Structures  116  may be mirrors or reflective portions of a chassis or other structural support in housing portion  12 M, reflective portions of optical modules  40 , a reflective rear portion of a display cover layer or other structure on front face F of device  10 , and/or other optical component structures and/or housing structures in device  10 . Detector  114  may have an array of photodetectors (e.g., a one-dimensional or two-dimensional array of photodiodes), allowing detector  114  to detect the position at which light beam  118  strikes detector  114 . During operation, deformation of housing portion  12 M and/or components in device  10  (e.g., changes in the positions of optical modules  40  in the example of  FIG.  15   ) may result in image misalignment. This misalignment may be detected by detecting changes in the position at which light beam  118  illuminates the photodetector array of sensor  114 . 
     If desired, interferometry (e.g., optical interferometry) may be used in measuring misalignment. Consider, as an example, the interferometer of  FIG.  16   . As shown in  FIG.  16   , laser interferometer sensor  16  of  FIG.  16    may have a coherent light source such as laser  120 . A first portion of the light emitted by laser  120  may pass through beam splitter  130 , may travel along first interferometer arm  126 , may reflect from structure  128 , may reflect from beam splitter  130 , may travel along second interferometer arm  122 , may reflect from structure  124 , and may pass through beam splitter  130  before reaching light detector  134 . A second portion of the light emitted by light source  120  may reflect from beam splitter  130  toward light detector  114 . Changes in distance D affect the length of interferometer arm  126  and therefore affect the phase of the first portion of the light reaching detector  134 . As a result of interference between the first and second portions of the coherent light reaching detector  134 , the relative phase of the first and second portions of light (and therefore changes in distance D) can be measured by sensor  16 . Structure  128  may be a portion of housing  12 M, a portion of an optical module or other optical component, or other structure in device  10  from which it is desired to gather a distance measurement. 
     If desired, a single light source (e.g. laser  112  of  FIG.  16   ) may be using in making multiple optical measurements (e.g., multiple time-of-flight measurements, multiple light beam angle measurements of the type described in connection with  FIG.  15   , multiple interferometric measurements, etc.). Optical couplers (e.g., beam splitters, prisms, gratings, etc.) may be used in dividing a single light beam from laser  112  into multiple light beams to use in one or more of these measurements, thereby reducing the number of light sources used in device  10 . An illustrative configuration in which three prisms  140  are being used to split a single beam from laser  112  into three respective misalignment measurement beams is shown in  FIG.  17   . 
     As described in connection with  FIG.  14   , front-facing cameras  46  and/or other optical components may be mounted on or adjacent to a portion of housing portion  12 M such as display cover layer  106 . This may help align the front-facing cameras or other optical components. To detect misalignment of images being captured by cameras  46 , sensors  16  may be coupled to display cover layer  106 . As shown in  FIG.  18   , for example, front-facing cameras  46  may be mounted to the inner surface of display cover layer  106  and may operate through display cover layer  106 . Placing cameras  46  against display cover layer  106  in this way may help align cameras  46  (e.g., left and right forward-facing cameras in device  10 ) and may help align the images produced by these cameras. Sensors  16  may be strain gauges formed from metal traces on the inner surface of display cover layer  106  or may be strain gauges attached to the inner surface of display cover layer  106  by adhesive (as an example). In the event that display cover layer  106  deforms during operation of device  10 , the misalignment of the images being captured by cameras  46  can be detected in real time. This allows compensating actions to be taken on the misaligned images (e.g., image warping operations on the image data may be performed). Sensors  16  may be attached to the inner surface of display cover layer  106  between each pair of respective cameras  46  and/or at other locations. If desired, deformation of housing portion  12 M such as deformation of display cover layer  106  may be used in compensating for optical module misalignment (e.g., in arrangements in which bending of display cover layer  106  is associated with misalignment between the images from modules  40  and eye boxes  30 ). 
     If desired, multiple sensors  16  may be used to measure the orientation between optical components and/or other structures in device  10  (e.g., by triangulation). Consider, as an example, the scenario of  FIG.  19   . In this example, optical modules  40  include left and right modules. The orientation between a right-facing surface of a left optical module (surface LH) and a corresponding left-facing surface of a right optical module (surface RH) is being measured using three sensors  16  (e.g., three distance sensors such as optical sensors or other sensors  16  of the types described in connection with  FIGS.  4 - 18   ). For example, a first distance sensor may measure a first distance L 1  between point  142  on surface LH and corresponding point  144  on surface RH, a second distance sensor may measure a second distance L 2  between point  146  on surface LH and corresponding point  148  on surface RH, and a third distance sensor may measure a third distance L 3  between point  150  on surface LH and corresponding point  152  on surface RH. By using these three distance measurements (L 1 , L 2 , and L 3 ), the relative orientation in X, Y, and Z (including any relative tilt about each of these axes and any changes in position) between the left and right optical modules  40  (and/or any other pair of structures in device  10 ) can be determined. 
     In general, the relative positions (including displacement and/or angle) between any pair of structures in device  10  can be measured using one or more sensors  16 . Consider, as an example, device  10  of  FIG.  20   . As shown in  FIG.  20   , sensors  16  such as strain gauges on front face F of housing portion  12 M and/or other structures in device  10  may measure image misalignment associated with images captured by forward facing cameras  46 . Sensors  16  may, for example, measure distance D 1  (and/or orientation angle) between points  154  and  156  on display cover layer  106  (or other portion of housing portion  12 M). Additional sensors  16  may measure distances (and/or orientation angles) such as distance D 2  (and/or angle) between point  158  (e.g., a portion of a rigid frame in cover  12 C, a chassis structure such as a rigid frame in housing portion  12 M, a left housing wall, etc.) and point  160  (e.g., a portion of lens barrel  32  or other optical module structure for a left optical module  40 ), distance D 2 ′ (and/or angle) between point  162  (e.g., a portion of left optical module  40 ) and point  164  (e.g., a portion of housing portion  12 M such as a portion of display cover layer  106 ), distance D 3  (and/or angle) between point  166  (e.g., a portion of a left optical module  40 ) and point  168  (e.g., a portion of a right optical module  40 ), and/or other distances and/or angles between respective portions of device  10 . As these examples demonstrate, one or more sensors  16  may be used in measuring the relative orientation between a head-mounted support structure of device  10  (e.g., a chassis or other device housing structure) and an optical component such as optical module  40 , between a pair of optical modules  40 , and/or between different portions of a head-mounted support structure. In configurations in which left and right forward-facing cameras  46  are mounted to respective left and right optical modules  40  (e.g., in positions  46 ′ of  FIG.  20   ), measuring the relative orientation between optical modules  40  serves to measure the relative orientation between the forward-facing cameras. In configurations in which forward-facing cameras  46  are mounted elsewhere in device  10 , sensors  16  can measure the relative position between cameras  46 , the position between each camera  46  and housing portion  12 M, and/or the relative position between each camera  46  and each optical module  40  (as examples). 
     Misalignment between respective cameras (and the images captured by the cameras) between a given camera and a given optical module (and their associated images), and/or between respective optical modules may be measured directly (e.g., by an associated sensor) or indirectly (e.g., by using a first sensor to detect a first misalignment such as a misalignment between a first component and housing portion  12 M and to detect a second misalignment such as a misalignment between housing portion  12 M and a second component, thereby producing misalignment information corresponding to misalignment between the first and second components). 
     Illustrative operations involved in operating device  10  are shown in  FIG.  21   . 
     During the operations of block  170 , sensors  16  may be used to gather information on the orientation of optical components in device  10 . Each optical component (e.g., each camera  46 , each optical module  40 , etc.) may have a respective sensor  16  and/or sensors  16  may measure support structure deformation that is associated with changes in the orientations of the optical components. This allows optical-component-to-optical-component misalignment to be monitored. If desired, structures in housing portion  12 M (e.g., a display cover layer, a frame or other chassis structure, and/or other optical component support structures, etc.) may be provided with one or more sensors  16  and/or one or more sensors  16  may be used in measuring optical-component-to-support-structure orientation. In this way, optical-component-to-optical component misalignment and corresponding image misalignment may be measured directly or indirection. Position measurements may be associated with camera-to-camera alignment, camera-to-optical-module alignment, camera-to-housing alignment, optical module-to-housing alignment, optical-module-to-optical-module alignment, and/or housing-to-housing alignment and each of these measurements may be associated with potential misalignment between images, between an image and an eye box, etc. 
     During the operations of block  172 , control circuitry  20  may process image data (captured images from cameras  46  and/or displayed images on optical modules  40 ) to compensate for misalignment measured by sensors  16  during the operations of block  170 . For example, if it is determined that an optical module (e.g., a right-hand optical module) is presenting an image that has become rotated counterclockwise by angle A relative to an eye box, compensating image warping may be performed on the image to rotate the image clockwise by angle A and thereby compensate for the misalignment. Camera images may likewise be warped. The image warping transforms that are applied during misalignment compensation operations may include geometrical transforms such as shifts, shears, rotations, etc. 
     Consider, as an example, a scenario in which sensors  16  determine that first and second optical components (e.g., a pair of cameras  46 , a pair of modules  40 , a camera and a module, etc.) are misaligned with respect to each other. During the image compensation operations of block  172 , control circuitry  20  may, based on the measured misalignment, warp a first image captured by or displayed by the first optical component and/or may warp a second image captured by or displayed by a second optical component, thereby compensating the images for the measured misalignment. 
     As shown by line  174 , the optical component orientation measurements of block  172  to detect component and image misalignment and the corresponding misalignment compensation image processing adjustments that are performed at block  172  may be performed continuously (e.g., upon detection of a drop event, upon power up, in response to a user-initiated calibration sequence during which a user is asked to move device  10  so that sensors  60  can detect misalignment, in accordance with a predetermined schedule, etc.). 
     As described above, one aspect of the present technology is the gathering and use of information such as information from input-output devices. The present disclosure contemplates that in some instances, data may be gathered that includes personal information data that uniquely identifies or can be used to contact or locate a specific person. Such personal information data can include demographic data, location-based data, telephone numbers, email addresses, twitter ID&#39;s, home addresses, data or records relating to a user&#39;s health or level of fitness (e.g., vital signs measurements, medication information, exercise information), date of birth, username, password, biometric information, or any other identifying or personal information. 
     The present disclosure recognizes that the use of such personal information, in the present technology, can be used to the benefit of users. For example, the personal information data can be used to deliver targeted content that is of greater interest to the user. Accordingly, use of such personal information data enables users to calculated control of the delivered content. Further, other uses for personal information data that benefit the user are also contemplated by the present disclosure. For instance, health and fitness data may be used to provide insights into a user&#39;s general wellness, or may be used as positive feedback to individuals using technology to pursue wellness goals. 
     The present disclosure contemplates that the entities responsible for the collection, analysis, disclosure, transfer, storage, or other use of such personal information data will comply with well-established privacy policies and/or privacy practices. In particular, such entities should implement and consistently use privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining personal information data private and secure. Such policies should be easily accessible by users, and should be updated as the collection and/or use of data changes. Personal information from users should be collected for legitimate and reasonable uses of the entity and not shared or sold outside of those legitimate uses. Further, such collection/sharing should occur after receiving the informed consent of the users. Additionally, such entities should consider taking any needed steps for safeguarding and securing access to such personal information data and ensuring that others with access to the personal information data adhere to their privacy policies and procedures. Further, such entities can subject themselves to evaluation by third parties to certify their adherence to widely accepted privacy policies and practices. In addition, policies and practices should be adapted for the particular types of personal information data being collected and/or accessed and adapted to applicable laws and standards, including jurisdiction-specific considerations. For instance, in the United States, collection of or access to certain health data may be governed by federal and/or state laws, such as the Health Insurance Portability and Accountability Act (HIPAA), whereas health data in other countries may be subject to other regulations and policies and should be handled accordingly. Hence different privacy practices should be maintained for different personal data types in each country. 
     Despite the foregoing, the present disclosure also contemplates embodiments in which users selectively block the use of, or access to, personal information data. That is, the present disclosure contemplates that hardware and/or software elements can be provided to prevent or block access to such personal information data. For example, the present technology can be configured to allow users to select to “opt in” or “opt out” of participation in the collection of personal information data during registration for services or anytime thereafter. In another example, users can select not to provide certain types of user data. In yet another example, users can select to limit the length of time user-specific data is maintained. In addition to providing “opt in” and “opt out” options, the present disclosure contemplates providing notifications relating to the access or use of personal information. For instance, a user may be notified upon downloading an application (“app”) that their personal information data will be accessed and then reminded again just before personal information data is accessed by the app. 
     Moreover, it is the intent of the present disclosure that personal information data should be managed and handled in a way to minimize risks of unintentional or unauthorized access or use. Risk can be minimized by limiting the collection of data and deleting data once it is no longer needed. In addition, and when applicable, including in certain health related applications, data de-identification can be used to protect a user&#39;s privacy. De-identification may be facilitated, when appropriate, by removing specific identifiers (e.g., date of birth, etc.), controlling the amount or specificity of data stored (e.g., collecting location data at a city level rather than at an address level), controlling how data is stored (e.g., aggregating data across users), and/or other methods. 
     Therefore, although the present disclosure broadly covers use of information that may include personal information data to implement one or more various disclosed embodiments, the present disclosure also contemplates that the various embodiments can also be implemented without the need for accessing personal information data. That is, the various embodiments of the present technology are not rendered inoperable due to the lack of all or a portion of such personal information data. 
     Physical environment: A physical environment refers to a physical world that people can sense and/or interact with without aid of electronic systems. Physical environments, such as a physical park, include physical articles, such as physical trees, physical buildings, and physical people. People can directly sense and/or interact with the physical environment, such as through sight, touch, hearing, taste, and smell. 
     Computer-generated reality: in contrast, a computer-generated reality (CGR) environment refers to a wholly or partially simulated environment that people sense and/or interact with via an electronic system. In CGR, a subset of a person&#39;s physical motions, or representations thereof, are tracked, and, in response, one or more characteristics of one or more virtual objects simulated in the CGR environment are adjusted in a manner that comports with at least one law of physics. For example, a CGR system may detect a person&#39;s head turning and, in response, adjust graphical content and an acoustic field presented to the person in a manner similar to how such views and sounds would change in a physical environment. In some situations (e.g., for accessibility reasons), adjustments to characteristic(s) of virtual object(s) in a CGR environment may be made in response to representations of physical motions (e.g., vocal commands). A person may sense and/or interact with a CGR object using any one of their senses, including sight, sound, touch, taste, and smell. For example, a person may sense and/or interact with audio objects that create 3D or spatial audio environment that provides the perception of point audio sources in 3D space. In another example, audio objects may enable audio transparency, which selectively incorporates ambient sounds from the physical environment with or without computer-generated audio. In some CGR environments, a person may sense and/or interact only with audio objects. Examples of CGR include virtual reality and mixed reality. 
     Virtual reality: A virtual reality (VR) environment refers to a simulated environment that is designed to be based entirely on computer-generated sensory inputs for one or more senses. A VR environment comprises a plurality of virtual objects with which a person may sense and/or interact. For example, computer-generated imagery of trees, buildings, and avatars representing people are examples of virtual objects. A person may sense and/or interact with virtual objects in the VR environment through a simulation of the person&#39;s presence within the computer-generated environment, and/or through a simulation of a subset of the person&#39;s physical movements within the computer-generated environment. 
     Mixed reality: In contrast to a VR environment, which is designed to be based entirely on computer-generated sensory inputs, a mixed reality (MR) environment refers to a simulated environment that is designed to incorporate sensory inputs from the physical environment, or a representation thereof, in addition to including computer-generated sensory inputs (e.g., virtual objects). On a virtuality continuum, a mixed reality environment is anywhere between, but not including, a wholly physical environment at one end and virtual reality environment at the other end. In some MR environments, computer-generated sensory inputs may respond to changes in sensory inputs from the physical environment. Also, some electronic systems for presenting an MR environment may track location and/or orientation with respect to the physical environment to enable virtual objects to interact with real objects (that is, physical articles from the physical environment or representations thereof). For example, a system may account for movements so that a virtual tree appears stationery with respect to the physical ground. Examples of mixed realities include augmented reality and augmented virtuality. Augmented reality: an augmented reality (AR) environment refers to a simulated environment in which one or more virtual objects are superimposed over a physical environment, or a representation thereof. For example, an electronic system for presenting an AR environment may have a transparent or translucent display through which a person may directly view the physical environment. The system may be configured to present virtual objects on the transparent or translucent display, so that a person, using the system, perceives the virtual objects superimposed over the physical environment. Alternatively, a system may have an opaque display and one or more imaging sensors that capture images or video of the physical environment, which are representations of the physical environment. The system composites the images or video with virtual objects, and presents the composition on the opaque display. A person, using the system, indirectly views the physical environment by way of the images or video of the physical environment, and perceives the virtual objects superimposed over the physical environment. As used herein, a video of the physical environment shown on an opaque display is called “pass-through video,” meaning a system uses one or more image sensor(s) to capture images of the physical environment, and uses those images in presenting the AR environment on the opaque display. Further alternatively, a system may have a projection system that projects virtual objects into the physical environment, for example, as a hologram or on a physical surface, so that a person, using the system, perceives the virtual objects superimposed over the physical environment. An augmented reality environment also refers to a simulated environment in which a representation of a physical environment is transformed by computer-generated sensory information. For example, in providing pass-through video, a system may transform one or more sensor images to impose a select perspective (e.g., viewpoint) different than the perspective captured by the imaging sensors. As another example, a representation of a physical environment may be transformed by graphically modifying (e.g., enlarging) portions thereof, such that the modified portion may be representative but not photorealistic versions of the originally captured images. As a further example, a representation of a physical environment may be transformed by graphically eliminating or obfuscating portions thereof. Augmented virtuality: an augmented virtuality (AV) environment refers to a simulated environment in which a virtual or computer generated environment incorporates one or more sensory inputs from the physical environment. The sensory inputs may be representations of one or more characteristics of the physical environment. For example, an AV park may have virtual trees and virtual buildings, but people with faces photorealistically reproduced from images taken of physical people. As another example, a virtual object may adopt a shape or color of a physical article imaged by one or more imaging sensors. As a further example, a virtual object may adopt shadows consistent with the position of the sun in the physical environment. 
     Hardware: there are many different types of electronic systems that enable a person to sense and/or interact with various CGR environments. Examples include head mounted systems, projection-based systems, heads-up displays (HUDs), vehicle windshields having integrated display capability, windows having integrated display capability, displays formed as lenses designed to be placed on a person&#39;s eyes (e.g., similar to contact lenses), headphones/earphones, speaker arrays, input systems (e.g., wearable or handheld controllers with or without haptic feedback), smartphones, tablets, and desktop/laptop computers. A head mounted system may have one or more speaker(s) and an integrated opaque display. Alternatively, a head mounted system may be configured to accept an external opaque display (e.g., a smartphone). The head mounted system may incorporate one or more imaging sensors to capture images or video of the physical environment, and/or one or more microphones to capture audio of the physical environment. Rather than an opaque display, a head mounted system may have a transparent or translucent display. The transparent or translucent display may have a medium through which light representative of images is directed to a person&#39;s eyes. The display may utilize digital light projection, OLEDs, LEDs, μLEDs, liquid crystal on silicon, laser scanning light sources, or any combination of these technologies. The medium may be an optical waveguide, a hologram medium, an optical combiner, an optical reflector, or any combination thereof. In one embodiment, the transparent or translucent display may be configured to become opaque selectively. Projection-based systems may employ retinal projection technology that projects graphical images onto a person&#39;s retina. Projection systems also may be configured to project virtual objects into the physical environment, for example, as a hologram or on a physical surface. 
     The foregoing is merely illustrative and various modifications can be made to the described embodiments. The foregoing embodiments may be implemented individually or in any combination.

Metadata:
Filing Date: 20210315
Publication Date: 20240102
Grant Date: 20240102
Priority Date: 20200506
Inventors: HOSSAIN, MUHAMMAD F.
RESNICK, SAMUEL A.
Assignee: APPLE INC
CPC Classifications: [{"code": "G02B7/02", "inventive": true, "first": true, "tree": "[]"}, {"code": "G01B7/31", "inventive": true, "first": false, "tree": "[]"}, {"code": "G01B11/272", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B25/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06T3/0093", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06T5/006", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B7/02", "inventive": true, "first": true, "tree": "[]"}, {"code": "G02B25/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "G01B7/31", "inventive": true, "first": false, "tree": "[]"}, {"code": "G01B11/272", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06T5/80", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06T3/18", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B25/001", "inventive": true, "first": true, "tree": "[]"}, {"code": "G02B7/02", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06T3/14", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B27/0176", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B27/0172", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B27/0179", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 89434357