Patent Publication Number: US-2023161376-A1

Title: Electronic Device With Sensors and Display Devices

Description:
This application is a continuation of patent application Ser. No. 17/464,358, filed on Sep. 1, 2021, which is a continuation of patent application Ser. No. 16/540,888, filed on Aug. 14, 2019, now U.S. Pat. No. 11,150,692, which is a continuation of patent application Ser. No. 15/729,394, filed on Oct. 10, 2017, now U.S. Pat. No. 10,474,417, which claims the benefit of provisional patent application No. 62/535,161, filed on Jul. 20, 2017, each of which are hereby incorporated by reference herein in their entireties. 
    
    
     FIELD 
     This relates generally to electronic devices and, more particularly, to devices with displays. 
     BACKGROUND 
     Electronic devices may include light-emitting components such as displays. It can be challenging to incorporate components such as these into an electronic device. If care is not taken, information on a display will not be visible to a viewer or will not be of interest to a user. 
     SUMMARY 
     An electronic device may have a housing. The housing may be characterized by a vertical axis and may have housing structures such as cylindrical housing structures with a cylindrical surface and circular periphery that extends around the vertical axis or other suitable housing structures (e.g., cube-shaped housing structures having planar surfaces and a rectangular periphery, pyramidal housing structures, cone-shaped housing structures, truncated cone housing structures, cylindrical housing structures with an slanted truncated top, etc.). A speaker may be mounted in the housing and may provide sound through openings in the housing structures. The speaker may be used to play songs and present other audible media for a user of the electronic device. In some configurations, synthesized voice may be provided using the speaker. If desired, the housing may be hollow (e.g., the electronic device may be a sleeve or other accessory cover that is configured to fit over the exterior surface of another device such as a main electronic unit). 
     A visual output device may be mounted in the housing of a stand-alone device or a housing associated with an accessory. The visual output device may emit light through openings in the housing structures. The visual output device may include an electrophoretic display, liquid crystal display, light-emitting diode display, or other display with an array of pixels to display images. In some configurations, the visual output device may include other components for emitting light (e.g., one or more light-emitting diodes that provide direct illumination or that supply backlight illumination for patterned openings in the housing such as icons or other symbols, etc.). 
     During operation, voice commands may be received by a microphone in the device and action taken based on the commands and other information. The action taken may include playing sound with the speaker and providing visual output with the visual output device. The visual output that is provided may include text, video and/or other still and moving images. In some configurations, visual output may be scrolled horizontally or vertically on the visual output device. For example, the visual output device may have an array of pixels that extends in a band around the circumference of the housing and text or other content may be scrolled horizontally around the housing. 
     The electronic device may include sensors for monitoring the environment and circuitry for communicating with external electronic equipment. Voice commands and other user input may be received by the electronic device. The electronic device may also use cameras and other components to gather information on the environment in which the electronic device is operating. User input and other information may be used in determining how to display information on the visual output device and/or how to present audio content using the speaker. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of an illustrative electronic device in accordance with an embodiment. 
         FIG.  2    is a diagram of an illustrative electronic device in accordance with an embodiment. 
         FIG.  3    is a cross-sectional side view of a portion of an illustrative electronic device in accordance with an embodiment. 
         FIG.  4    is a cross-sectional side view of an illustrative light-emitting device having a light source mounted on a substrate such as a printed circuit in accordance with an embodiment. 
         FIG.  5    is a cross-sectional side view of an illustrative light-emitting device having a waveguide such as a fiber waveguide or a light guide layer in accordance with an embodiment. 
         FIG.  6    is a cross-sectional side view of an illustrative light-emitting device coupled to conductive strands such as conductive strands in a fabric layer in accordance with an embodiment. 
         FIG.  7    is a cross-sectional side view of an illustrative light-emitting device with an array of pixels in accordance with an embodiment. 
         FIG.  8    is a perspective view of a fabric layer with openings in which light-emitting devices have been formed in accordance with an embodiment. 
         FIG.  9    is a side view of an illustrative electronic device that is displaying content for a viewer in accordance with an embodiment. 
         FIG.  10    is a top view of an illustrative electronic device showing how different content may be displayed simultaneously on difference sides of the device for different respective viewers in accordance with an embodiment. 
         FIG.  11    is a flow chart of illustrative operations involved in operating an electronic device in accordance with an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Electronic devices may be provided with components for gathering input from a user and from the environment. Based on this information, an electronic device may provide users with output. For example, a user may supply touch commands, voice commands, button press input, or other input to a device and the device may provide corresponding audio and visual output. 
     An illustrative electronic device of the type that may gather input and supply corresponding output is shown in  FIG.  1   . Electronic device  10  of  FIG.  1    may be a computing device such as a voice-controlled assistant, a laptop computer, a computer monitor containing an embedded computer, a tablet computer, a cellular telephone, a media player, other handheld or portable electronic devices, a smaller device such as a wristwatch device (e.g., a watch with a wrist strap), a pendant device, a headphone or earpiece device, a device embedded in eyeglasses or other equipment worn on a user&#39;s head, or other wearable or miniature device, a television, a computer display that does not contain an embedded computer, a gaming device, a navigation device, an embedded system such as a system in which electronic equipment with a display is mounted in a kiosk or automobile, equipment that implements the functionality of two or more of these devices, or other electronic equipment. In the illustrative configuration of  FIG.  1   , device  10  is a voice-controlled assistant device (e.g., a countertop speaker). This is merely illustrative. Other configurations may be used for device  10  if desired. The example of  FIG.  1    is merely illustrative. 
     In the example of  FIG.  1   , device  10  includes one or more visual output devices  14 . In some configurations, visual output devices  14  may include arrays of pixels that display images. In other configurations, visual output devices  14  serve as status indicator lights, provide illumination for patterned openings (e.g., openings in the shape of icons, etc.), and/or otherwise provide light-based output without necessarily being able to display images. Because embodiments of visual output devices  14  may include pixel arrays for displaying images, visual output devices  14  may sometimes be referred to as displays  14 . This is merely illustrative. If desired, device  10  may include visual output devices based on one or a few light-emitting diodes, lamps, or other light-emitting components that do not display images. 
     As shown in  FIG.  1   , light-emitting devices such as displays  14  may be supported by support structures in device  10  such as housing  40 . For example, a display may be formed on upper surface  44  of housing  40  and/or on sidewall surface  42  of housing structures in housing  40 . Housing structures for housing  40 , which may sometimes be referred to as an enclosure or case, may be formed of plastic, glass, ceramics, fabric, fiber composites, metal (e.g., stainless steel, aluminum, titanium, gold, etc.), other suitable materials, or a combination of any two or more of these materials. Housing  40  may be formed using a unibody configuration in which some or all of housing  40  is machined or molded as a single structure or may be formed using multiple structures (e.g., an internal frame structure, one or more structures that form exterior housing surfaces, etc.). 
     Displays  14  may be a touch sensitive displays or may be insensitive to touch. A touch sensitive display may incorporate a layer of conductive capacitive touch sensor electrodes or other touch sensor components (e.g., resistive touch sensor components, acoustic touch sensor components, force-based touch sensor components, light-based touch sensor components, etc.) or may be a display that is not touch-sensitive. Capacitive touch screen electrodes may be formed from an array of indium tin oxide pads or other transparent conductive structures. If desired, force sensors may overlap displays  14  (e.g., so that a user may supply force-based input commands by pressing downwards on the display). 
     Each display  14  may include an array of pixels formed from liquid crystal display (LCD) components, an array of electrophoretic pixels, an array of plasma pixels, an array of organic light-emitting diode pixels or other light-emitting diodes (e.g., micro-light-emitting diodes, light-emitting diodes in plastic packages, etc.), an array of electrowetting pixels, or pixels based on other display technologies. 
     In the example of  FIG.  1   , housing  40  of electronic device  10  has a cylindrical shape and exhibits rotational symmetry around longitudinal (vertical) axis  46 . Device  10  may have other shapes, if desired. For example, device  10  may have a rectangular box shape, a pyramidal shape, a truncated cone or truncated cylindrical shape such as a cylindrical shape of the type shown by device  10  of  FIG.  1    in which upper surface  44  is tilted, spherical shapes, hemispherical shapes, etc.). During operation, a user may supply voice commands and other input to device  10  and, in response, device  10  may control home automation functions (e.g., via wirelessly connected home equipment), may play content such as audio and video, may process online database search requests (e.g., internet searches), may process orders for products and services, may provide a user with calendar information, may receive and process email, may run games or other software, may handle audio communications (e.g., telephone calls), video calls (e.g., live video communications with accompanying audio), and/or may handle other tasks. 
     A schematic diagram of electronic device  10  is shown in  FIG.  2   . As shown in  FIG.  1   , electronic device  10  may communicate with external equipment such as electronic equipment  30  using communications link  28 . Communications link  28  may be a wireless local area network link, a cellular telephone communications link, other short or long range wireless link, may be a wired link (e.g., an Ethernet link, etc.), and/or may be any other suitable communications path. Electronic equipment  30  may be controlled by device  10  (e.g., when equipment  30  is a gaming unit, set-top box, television, display, computer, tablet computer, cellular telephone, etc.), may be a peer device (e.g., another voice-controlled assistant device such as device  10 ), and/or may be a controller or other accessory for device  10 . External equipment  30  may include home automation equipment and other home or office equipment (e.g., lighting controllers, heating and air conditioning equipment that is controlled by device  10 , security equipment, irrigation equipment, audio-visual equipment, etc.). 
     Device  10  may use communications circuitry  26  to support communications with electronic equipment  30  over link  28 . Communications circuitry  26  may include wired and wireless communications circuitry (e.g., a wireless transceiver such as a wireless local area network transceiver and/or cellular telephone transceiver, antennas, etc.). Using communications circuitry  26 , device  10  can gather information from a server or other online equipment (e.g., equipment  30 ) over the internet. For example, device  10  can obtain information on the current weather from a weather server, can obtain news, stock quotes, sports scores, travel information such as transportation schedules, can download email into an inbox supported by device  10 , etc. 
     Information on the current weather, the current temperature, and/or other sensor information (e.g., air pressure, humidity, etc.) may be used in determining how to adjust displays and/or other light-emitting devices in device  10 . If, for example, the temperature is cold, device  10  may use display  14  or other light sources to display cold colors (e.g., blue). In response to detecting that the temperature is warm (e.g., by obtaining online temperature information from an online weather source, by using a thermometer, etc.), device  10  may use display  14  or other light sources to display warm colors (e.g., yellow). Device  10  may also display mood lighting, decorative patterns, and/or other visual content (bar graphs, icons, text, etc.) that varies depending on other parameters (e.g., indoor temperature, time of day, received text message count, email inbox message count, online information such as sports scores, stock prices, weather, news, etc.). As an example, device  10  may glow with increasing brightness as incoming messages increase in number. As another example, a team logo may be displayed if a given sports team wins a game, a stock price may be displayed if a predetermined threshold price has been exceeded, a sunshine icon may be displayed if sunny weather is forecast, and/or other information may be displayed on device  10 . A user may preselect which types of information are displayed (weather, sports scores, sports results, stock prices, incoming email excerpts or subject lines, text message content, etc.). 
     As shown in  FIG.  2   , device  10  may have control circuitry  16 . Control circuitry  16  may include storage and processing circuitry for supporting the operation of device  10 . The storage and processing circuitry may include storage such as hard disk drive storage, 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  16  may be used to control the operation of device  10 . The processing circuitry may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio chips, application specific integrated circuits, etc. In some configurations, control circuitry  16  may operate in cooperation with on-line control circuitry (e.g., one or more remote servers, networked computing equipment in a local area network, coupled peer devices, or other remote storage and processing circuitry. 
     Input-output circuitry in device  10  such as input-output devices  12  may be used to allow data to be supplied to device  10  and to allow data to be provided from device  10  to external devices. Input-output devices  12  may include light-emitting components. For example, input-output devices can include visual output devices  14  such as display(s) and/or other light sources. Visual output devices  14  may include one or more individual light-emitting devices such as light-emitting diode(s), laser(s), and/or lamp(s). Visual output devices  14  may also include arrays of pixels for forming displays such as liquid crystal displays, organic light-emitting diode displays, displays formed from light-emitting diodes on respective crystalline semiconductor dies (microLEDs), etc. Pixel arrays may include any suitable number of pixels (e.g., at least 100, at least 1000, at least 10,000, at least 100,000, fewer than 1,000,000, etc.). 
     Input-output devices  12  may include input component such as buttons, touch sensors (e.g., capacitive touch sensors, optical touch sensors, etc.), force sensors, and/or other devices for receiving input such as button press input and/or touch or force sensor input. 
     Sensors  20  may be used in gathering environmental measurements and/or user input and may include ambient light sensors (visible light sensors, color sensitive light sensors, ultraviolet light sensors, etc.), optical proximity sensors, capacitive proximity sensors, temperature sensors (e.g., to measure ambient temperature), force sensors (e.g., for measuring biometric information), gas pressure sensors, heart rate sensors, blood oxygen level sensors (e.g., based on emitted and detected light), electrocardiogram sensors (e.g., sensors for measuring electrical signals on a user&#39;s body), particulate sensors (e.g., sensors that use light measurements and/or other measurements to measure particulate concentration in the air), image sensors (cameras), gas pressure sensors, carbon dioxide sensors and/or sensors measuring other gas concentrations, position and/or orientation sensors (e.g., inertial measurement units based on one or more sensors such as accelerometers, gyroscopes, and/or compasses), ultrasonic sensors that measure distance using echolocation (e.g., by emitting ultrasonic signals and detecting corresponding ultrasonic echoes with a microphone), accelerometers for gathering user tap input, sensors that gather hand gestures and other three-dimensional gesture input (e.g., using optical sensing, capacitive sensing, etc.), etc. Audio and/or video feedback may be presented as sensors gather user input. For example, detected hand gestures can be accompanied by audible clicks and/or variations in light output that serve as feedback informing a user that the hand gestures have been successfully detected by device  10 . 
     Device  10  may include audio devices such as one or more speakers (e.g., tweeters, midrange speakers, woofers, subwoofers, etc.) and one or more audio sensors (e.g., microphones for gathering voice command input, microphones that measure ambient noise as part of a noise cancellation system, microphones in echolocation sensors, etc.). 
     If desired, device  10  may include other input-output devices such as devices  24  (e.g., gaze detection systems, thermal imaging systems, haptic output devices, etc.). Haptic output devices may include piezoelectric devices, electromagnetic actuators, and/or other actuators for generating haptic output. 
     Device  10  may include one or more batteries, may include a power converter for converting mains power into internal direct-current power, and/or may include other power circuitry (e.g., wireless power circuitry for receiving wirelessly transmitted power, wireless power circuitry for transmitting wireless power to nearby devices, etc.). 
     In some configurations, some of all of the outer surface of housing  40  may be permeable to sound. For example, fabric, metal, glass, or polymer layers with perforations or other openings, and/or other structures that allow sound to pass may be using in forming sidewalls on sides  42  of housing  40 , a wall for upper surface  44  of housing  40 , and/or other housing structures. If desired, multiple layers of material that are permeable to sound may be used in forming the walls of housing  40 . For example, device  10  may have an outer fabric layer that is permeable to sound and an inner plastic frame that has openings that allow sound to pass. These sound-permeable structures allow sound from speakers in the interior of housing  40  to pass to the exterior of device  10  and allow sound from the exterior of device  10  to pass to microphones in the interior of device  10 . 
     Device  10  may also be configured to emit light. For example, housing  40  may have one or more layers such as illustrative layers  50  and  52  of  FIG.  3   . These layers may include, for example, an outer sound permeable fabric layer (e.g., layer  52 ) and an inner sound permeable layer (e.g., a plastic, glass, or metal structure with perforations or other openings that permit sound to pass). As shown in  FIG.  3   , light sources  56  may emit light  58  that passes through layers such as sound-permeable layers  50  and  52 . Light  58  may, for example, pass through openings  60  in layer  50  and/or layer  52 . Openings  60  may be perforations, may be filled with transparent material and/or may be openings filled with air, may be openings between strands of material in woven or knit fabric, may be openings in layers of glass, metal, polymer, or other materials, and/or may be other suitable openings. 
     Openings  60  may allow both light  58  and sound to pass between device interior  62  to device exterior  64  and/or may be openings that allow only light  58  to pass. In arrangements in which openings  60  are not permeable to sound and/or in which other openings that are more permeable to sound are present in the layer(s) of material forming housing walls for housing  40 , sound may pass through sound permeable openings that are separate from openings  60  (see, e.g., sound opening  66  that allows sound  68  to pass from speaker  70  in interior  62  to exterior  64 ). Openings  60  and/or  66  may be formed by weaving, knitting, or braiding fabric with openings  60  and/or  66  or may be formed using laser cutting and/or other hole-formation techniques. 
     Illustrative light-emitting devices of the type that may be used in forming visual output devices such as displays  14  of  FIG.  1    are shown in  FIGS.  4 ,  5 ,  6 , and  7   . In the example of  FIG.  4   , light-emitting device  56  has a light-emitting component such as component  76  that emits light  58 . Component  76  may be a light-emitting diode (packaged or unpackaged), may be a laser diode, may be a lamp, may be an electroluminescent device, and/or may be other suitable circuitry for emitting light  58  in response to applied current. Component  76  may have electrical terminals that are electrically coupled to metal traces  74  on substrate  72 . Substrate  72  may be a printed circuit such as a flexible printed circuit or a rigid printed circuit board. 
       FIG.  5    shows how light-emitting device  56  may have a light-emitting component  78  (e.g., a light-emitting diode, laser, etc.) that emits light  80  into an edge of light guiding waveguide  82 . Waveguide  82  may be a planar light guide layer (e.g., a light guide layer formed from a transparent polymer sheet), may be an optical fiber (e.g., a cylindrical fiber that conveys light internally along its length), and/or may be another suitable light guiding structure. During operation, light  80  that is being conveyed internally in waveguide  82  due to the principal of total internal reflection may be scattered outwardly by light-scattering structures in waveguide  82  and may therefore serve as visible illumination  58  (e.g., light visible by a user of device  10 ). If desired, light  58  may serve as backlight for a liquid crystal display, electrophoretic display, or other display (see, e.g., backlit display  84  of  FIG.  9   ). Light  58  may also pass through patterned opaque structures (e.g., a layer of black ink with an opening forming an icon or alphanumeric character) to provide a user with a backlit icon, text, etc. Waveguide  82  may overlap a single opening in housing  40  (e.g., to allow light to pass through the opening) and/or may overlap some or all of the walls of housing  40 . For example, waveguide  82  may have the shape of a cylinder that provides the cylindrical side surface of housing  40  with backlight (e.g., to backlight an array of pixels that wraps around the cylindrical surface of device  10  to provide illumination through openings surrounding housing  40 , etc.). If desired, device  10  may contain multiple waveguides such as waveguide  82  and two or more of these multiple waveguides may overlap. 
       FIG.  6    shows how light-emitting device  56  may include a light-emitting component such as component  61  (e.g., a light-emitting diode, laser diode, electroluminescent component, lamp, etc.). Component  61  may have terminals that are electrically coupled to conductive strands of material such as conductive strands  59 . Strands  59  may be solid metal wires, polymer strands coated with metal, or other conductive strands of material and may, if desired, be incorporated into a layer of fabric in housing  40 . Components such as component  61  of  FIG.  6    and component  76  of  FIG.  4    may, if desired, be light-emitting diodes that are deposited (printed) in a slurry (e.g., so that some of the deposited light-emitting diodes may electrical contact to metal traces and/or wires and so that others do not). Slurry-based diode mounting schemes may be used to reduce process complexity. If desired, welds or solder joints may be used in coupling components  61  to conductive strands. 
     In the example of  FIG.  7   , light-emitting device  56  has an array of pixels P that are individually controlled to produce light  58 . The pixel array of device  56  of  FIG.  7    allows device  56  of  FIG.  7    to display images for a user (e.g., device  56  of  FIG.  7    may be a display). Pixels P may be formed on a common substrate such as substrate  55  (e.g., a polymer layer, a layer of glass, etc.) and/or may be formed from light-emitting diodes that are individually packaged and/or individual bare crystalline semiconductor dies containing respective light-emitting diodes. In arrangements in which pixels P are mounted individually in device  10 , mounting arrangements such as the illustrative mounting arrangements of  FIGS.  4  and  6    may be used (e.g., components  76  and  61  of  FIGS.  4  and  6    may serve as pixels P in an array of pixels). 
       FIG.  8    is a perspective view of a portion of a fabric layer that may be used in forming device  10 . As shown in  FIG.  8   , fabric layer  86  may be formed from strands of material  88  that have been woven or otherwise intertwined (e.g., using knitting techniques, braiding techniques, etc.). Woven fabric or other fabric such as fabric layer  86  may have openings (see, e.g., the openings that receive light-emitting devices  56  in the example of  FIG.  8   ). These openings may form acoustic and/or optical openings such as openings  60  and  66  of  FIG.  3   . Sound (and, if desired, light) may also pass through gaps between adjacent strands  88  in fabric layer  86 . 
     Fabric layer  86  may form an outer housing layer in housing  40  (e.g., layer  52  of  FIG.  3   ) and/or may form one or more inner housing layers in housing  40  (see, e.g., layer  54  of  FIG.  3   ). In the illustrative configuration of  FIG.  8   , openings have been formed in fabric layer  86  that receive corresponding light-emitting devices  56  (e.g., light-emitting diodes, etc.). Light-emitting devices  56  such as light-emitting diodes may form pixels P in a pixel array (e.g., so that devices  56  can serve as pixels in a display) and/or may form lower-resolution light-based output devices (e.g., status indicator lights, backlight for icons in a patterned opaque layer, etc.). Light-emitting devices  56  may be mounted to one or more different substrates (e.g., one or more printed circuits) ad/or may be integrally formed with other circuitry on a substrate. For example, light-emitting devices  56  may be organic light-emitting devices on a flexible organic light-emitting diode display substrate. 
     With one illustrative configuration, light-emitting devices  56  are packaged or unpackaged rectangular devices and have lateral dimensions D 1  of about 50 microns to 200 microns, at least 30 microns, at least 50 microns, at least 100 microns, less than 500 microns, less than 300 microns, or other suitable size. The corresponding openings in fabric layer  86  may have the same size or may be larger or smaller (e.g., openings in layer  86  may have lateral dimensions of at least 50 microns, at least 100 microns, at least 200 microns, at least 300 microns, less than 500 microns, or other suitable size). 
     To provide an array of pixels P formed from light-emitting devices  56  with sufficient resolution to display images, it may be desirable for the device-to-device spacing of devices  56  (spacing distance D 2 ) to be about 1-2 times D 1 , to be at least 1 D 1 , to be at least 2 D 1 , to be at least 3 D 1 , to be less than 4 D 1 , to be less than 2 D 1 , or to be less than 1 D 1  (as examples). The array of light-emitting diodes or other pixels P may contain at least 10 light-emitting diodes or other pixels P, at least 100 light-emitting diodes or other pixels P, at least 1000 light-emitting diodes or other pixels P, at least 10,000 light-emitting diodes or other pixels P, fewer than 1,000,000 light-emitting diodes or other pixels P, or fewer than 1000 light-emitting diodes or other pixels P (as examples). 
     In some arrangements, multiple fabric layers such as fabric layer  86  may form fabric for device  10 . For example, housing walls in housing  40  may be formed form a layer of fabric that includes multiple woven layers such as layer  86  of  FIG.  8   . Multi-layer fabric walls may include multiple individual fabric layers that are laminated together using adhesive or may include a single multi-layer fabric (e.g., a fabric in which multiple layers of warp and weft strands are woven together). 
     The strands of material in fabric layer  86  may include polymer strands, strands of cotton and other natural materials, and strands including metal and other conductive materials. Conductive strands may be formed from metal wire or a polymer core coated with a layer of metal or other conductive material. Conductive strands may be bare so that conductive materials such as metal are exposed or may be covered with a polymer insulating coating and/or other coatings. Insulating strands may be formed form dielectrics such as polymer or glass. 
     In some arrangements, fabric or other layers of material in device  10  may include transparent strands of material (optical fibers). Transparent strands may serve as waveguides for carrying light. These waveguides may be roughened at one or more locations along their lengths to create light-scattering structures that cause light to be selectively emitted from the waveguides. For example, one or more transparent polymer strands or glass strands may serve as waveguides such as waveguide  82  of  FIG.  5    and may be provided with light from a coupled light-emitting diode or other light-emitting component  78 . The portions of a fiber waveguide or a light guide layer that is guiding light from a light-emitting diode may be overlapped by one or more openings in a fabric layer and/or other layers of material in housing  40  of device  10 . In some configurations, light-emitting devices  56  may include electroluminescent wire or other light-emitting structures that can be woven or otherwise incorporated into a layer of fabric or other material for housing  40 . 
       FIG.  9    is a side view of an illustrative device such as device  10  of  FIG.  1   . As shown in  FIG.  1   , portions of device housing  40  such as sidewall portion  44  may be provided with visual output using light-based components such as light-emitting diodes, pixel arrays, etc. (see, e.g., light sources  56 ). If desired, different portions of housing wall  44  may be provided with different types of content. For example, portion  44 - 1  may be provided with text. The text may scroll automatically in direction  90  and may, if desired, scroll horizontally around most or all of the circumference of device  10  (e.g., portion  44 - 1  may form a ring-shaped band or other ring-shaped region that surrounds the periphery of device  10 ). In addition to or instead of horizontally scrolling text or other visual information in direction  90 , text or other visual information may be scrolled vertically. Portion  44 - 2  of the side of housing  40  may be provided with still and/or moving images containing text, icons and other graphical elements, video (with accompanying audio), and/or other visual content. In some configurations, patterns of light (e.g., oscillating waveforms to indicate that a voice recognition function is active and/or processing) may be displayed in region  44 - 2  when appropriate. Additional regions of sidewall portion  44  and/or the top of device  10  may also be provided with still and/or moving images or other content. 
     The content that is provided with the visual output devices of device  10  (e.g., on side portions of device  10 , on upper portions of device  10 , etc.) may include images displayed on pixel arrays, may include icons, alphanumeric characters, and other symbols displayed using backlit opaque structures having symbol-shaped openings and/or symbol shaped backlight structures such as symbol-shaped light guides or array of light-emitting devices, may include decorative trim patterns (e.g., a red circle running along the upper edge of housing  40 ), and/or may include other visual output information. 
     In some configurations, the information that is displayed by a display or other light source(s) in device  10  may be associated with media playback. For example, a media playback volume indicator may be presented in a band around the perimeter of device  10 . The volume indicator may, for example, wrap around all of device  10  and may have a height above the surface on which device  10  is resting that is proportional to the current audio playback volume for device  10 . When playback volume is increased, the height of the illuminated band in region  44  of device  10  may be increased proportionally. When playback volume is muted, the illuminated band may be removed or changed in color (as examples). 
     Device  10  may communicate with a display device such as a computer with a display, a stand-alone display, a television, or other device with a display. As an example, one or more devices  10  may be wirelessly linked to a television system that is displaying movie content. During movie playback, there may be bright flashes of light (e.g., flashes of orange if the movie contains explosions). To enhance the orange light that is present in the currently playing movie or other media, displays  14  or other visual output devices on device  10  may present synchronized content (e.g., displays  14  may flash bright orange in synchronization with the orange content on the television or other display). Device  10  may automatically sense ambient light color changes (e.g., the appearance of orange due to explosions on a television) and may adjust the color of the output light on display(s)  14  accordingly or device  10  may be provided with a synchronized lighting schedule (e.g., orange at 70% intensity for 1 minute, yellow at 5% intensity for 17 minutes, etc.) that is based on knowledge of the content being displayed on the television or other device. 
     In some configurations, device  10  may be used by multiple users simultaneously. Consider, as an example, the illustrative top view of device  10  that is shown in  FIG.  10   . In this configuration, device  10  is running a game or other software. The game can receive input from users such as users  94  and  98  and can supply corresponding output on visual output devices (e.g., a display on sidewalls  44  and/or other portions of housing  40 ). Because the users are located on opposing sides of device  10  (in this example), the control circuitry of device  10  can use the visual output devices in device  10  to display first content in region  44 B for viewing by user  94  who is viewing device  10  in direction  96  and to simultaneously display second content in region  44 A for viewing by user  98  who is viewing device  10  in direction  100 . The first content may be hidden from view by the second user and the second content may be hidden from view by the first user, allowing the first and second users to play a game in which the information displayed to each user is private and not shared. 
     Sensors  92  (e.g., cameras, proximity sensors, etc.) in device  10  can be used to monitor the positions of users  94  and  98  so that the positions of regions  44 A and  44 B can be dynamically adjusted. If desired, keystone distortion in displayed images (e.g., distortion due to a user&#39;s standing position) can be corrected dynamically during the presentation of visual content on display  14 . For example, if user  94  is sitting and viewing region  44 B head on, images without keystone distortion correction may be displayed in region  44 B. If, however, user  98  is standing adjacent to device  10  and is viewing region  44 A at an angle, keystone image correction operations may be performed on the content being displayed in region  44 A to compensate for the user&#39;s viewing angle. Images that are compensated in this way will appear to be less distorted than images that are not compensated. If desired, device  10  can display shared information for multiple users during a game (e.g., lyrics during a karaoke game, yoga assistance information during an exercise routine, etc.). 
     Device  10  can be used as a communications device. For example, device  10  can operate as a telephone (e.g., a voice-over-internet protocol telephone), can handle video communications (e.g., live video calls with accompanying audio), or can serve as one terminal in a multi-terminal in-home intercom system. Device  10  may, for example, communicate over an in-home wired or wireless network with other devices  10  in other rooms of a home. This allows a user in one room to talk to a user in another room. Users can call each other using voice commands that direct device  10  to form a voice link with an appropriate device  10  in another room. Devices  10  can also be used to form a baby monitor system (e.g., by picking up audio and/or video in a baby&#39;s room with a first device  10  and transmitting that audio and/or video in real time to a corresponding second device in another room for presentation to a parent). 
     A user may, if desired, use a cellular telephone or other eternal equipment (e.g., equipment  30  of  FIG.  2   ) to supply touch screen input to device  10 . Consider, as an example, a scenario in which multiple users are viewing device  10 . In this situation, a sidewall display or other display in device  10  can be used as a shared output device (e.g., a digital whiteboard). A user may draw objects to be displayed on display(s)  14  using a touch sensor in the user&#39;s external equipment (e.g., a cellular telephone or tablet touch screen, a touch sensor in a laptop, etc.). If desired, a user may use the display(s) of device  10  to display a graphical presentation stored on equipment  30  or may otherwise direct device  10  to display information from equipment  30 . 
     In some configurations, equipment  30  may be controlled by device  10  (e.g., device  10  may serve as a remote control for equipment  30 ). For example, a user may supply voice commands, touch sensor input, or other input to device  10  that device  10  conveys to equipment  30  via link  28 . The commands may direct equipment  30  to select media for playback on a display and speakers in equipment  30 , to make volume adjustments, to make display brightness adjustments, to make channel change adjustments, and/or to make other changes to the operation of equipment  30 . When device  10  serves as a remote control for media playback equipment (e.g., an audio system, a television, or other audio-visual equipment), display(s)  14  may be used to display media playback information (e.g., currently playing track information such as a song title and artist, next-to-play track information, shows on alternate television channels, shows scheduled at subsequent time slots on a currently active television channel, etc.). While presenting audio information and/or video information using speakers and display(s)  14  in device  10 , device  10  can use display(s)  14  to present information on the currently playing media track, upcoming tracks, lyrics, ratings information, artist information, current channel or service name, and/or other information related to the audio and/or video being presented to the user. 
     If desired, sensors  92  may include echolocation sensors. Using echolocation sensors (e.g., sensors that emit sound and that receive reflected sound using microphones) and/or other sensors (e.g., cameras, proximity sensors, color ambient light sensors, microphones that measure ambient sound and other sound, etc.), device  10  may determine the position and orientation of device  10  relative to nearby external objects. The nearby objects may include a wall in a home or other obstructions. Device  10  may sense the location of these obstructions and may use information on the obstruction location to determine which portions of the visual display devices (e.g., displays  14 ) are not obstructed. Visual content can then be displayed on the unobstructed portions of device  10 . Device  10  may also use information on the surroundings of device  10  (e.g., the color of a counter on which device  10  is resting, the color of a counter backsplash adjacent to device  10 , etc.). Based on information on the appearance (color, texture, etc.) of the surroundings of device  10 , device  10  can make appropriate adjustments to the content on displays  14 . For example, device  10  can adjust portions of displays  14  to mimic the colors of external objects and thereby allow device  10  to visually blend into its surroundings. As another example, device  10  can present content on displays  14  that contrasts with the colors of external objects surrounding device  10 . 
     The content provided on the visual output devices of device  10  may include a graphical acknowledgement (e.g., a graphical pattern that indicates to a user that a wake command or other voice command or input has been satisfactorily received and that device  10  is now performing a desired task such as awaiting further voice input). Visual feedback in the form of an abstract visual pattern and/or text or other visual feedback may help inform a user of the current operating state of device  10  (e.g., whether device  10  is ready to receive input or not). This may assist a user in interacting with device  10 . 
     The content displayed on displays  14  of device  10  may include a text transcription of currently spoken voice commands or other voice input. This may help provide a user with visual feedback during voice interactions with device  10 . Text may be scrolled vertically and/or horizontally, may be displayed on a side of device  10  facing a user and/or facing away from a nearby wall or other external obstruction, etc. Additional visual feedback may be provided in the form of an animated assistant. The animated assistant may be a lifelike or cartoon avatar (e.g., a computer-generated graphical representation of a human face) with moving lips synchronized to synthesized voice. The synthesized voice may be used to prompt a user to supply input, to confirm that an action has been taken by device  10  in response to user voice commands or other user input, and/or to otherwise provide vocal output to a user. The accompanying visual feedback may have a human-like visual form, may be an abstract pattern of light (e.g., a colorful graphic image that pulses or otherwise changes appearance in synchronization with synthesized speech or other output), and/or may have other suitable visual forms. If desired, visual assistants (e.g., avatars, etc.) may be displayed statically on device  10  (e.g., on the sidewalls of device  10  or other surfaces with visual output devices). In some embodiments, synthesized voice may be provided with accompanying text (e.g., text of the synthesized voice to assist hearing impaired users). The text may include internet search results and other database information that is supplied in response to a user database query (e.g., a voice query to an online database, input from a touch sensor, keyboard, or other input device, etc.). 
     When playing media for a user, device  10  may display text and/or other visual output representing currently playing media (e.g., audio tracks, video, etc.). Notifications may also be displayed by the visual output devices of device  10  (e.g., notifications of incoming email messages or other messages, notifications of calendar events, etc.). As an example, device  10  may be linked to an online account of a user (e.g., an email account, calendar account, etc.) and/or may otherwise receive personalized content associated with the user. Information associated with the user&#39;s account may be automatically retrieved (e.g., device  10  may automatically log into the user&#39;s account) when a camera or other sensor in device  10  recognizes that the user is present in the vicinity of device  10 . Personalized content associated with the user&#39;s account (notifications, messages, calendar entries, etc.) may be displayed on the sides of device  10  or elsewhere in device  10 . 
     Device  10  may handle the presentation of content to users differently in different modes of operation. For example, a device such as device  10  may operate in a work mode when located at a work location and may be operated in a home mode when located in a home environment. Content may be displayed with different amounts of privacy and/or other attributes based on the current operating mode of device  10 . For example, when device  10  is operated in an entertainment mode, information on currently playing media may be displayed on displays  14 , but personal content such as email messages and text messages may not be displayed unless explicitly requested by a user. As another example when device  10  is operated in a family mode, messages that originate with family members may be displayed, while other messages may be suppressed. In yet another illustrative scenario, device  10  may be operated in a personal mode, in which all messages and other content available in a user&#39;s account may be displayed on displays  14 . 
     Content presentation may be customized based on criteria such as the location of device  10  within the home, the time of day and date, the proximity of individuals to device  10 , the current operating mode for device  10  (family mode, entertainment mode, etc.) and/or other content presentation criteria. As an example, peaceful visual content may be displayed and peaceful music may be played in a living room environment at night and energetic visual content may be displayed and energetic music may be played in a kitchen environment in the morning. On holidays, holiday-specific visual content may be displayed (e.g., colors following a holiday motif, holiday-specific screen-saver images) and holiday-specific music may be automatically played. On a user&#39;s birthday, a birthday song may be played when the user&#39;s presence is detected and a happy birthday greeting may be displayed. Content may be presented upon detecting that the user has come within proximity of device  10  or upon satisfaction of other presentation criteria. 
     If desired, movement of device  10  (e.g., motion detected with an inertial measurement unit (e.g., an accelerometer, gyroscope, and/or compass) may be used in determining how to present visual and/or audio information to a user with device  10 . For example, movement of device  10  may prompt device  10  to ask the user (e.g., with computer-generated voice) whether the appearance of device  10  should be updated to reflect the new surroundings of device  10 . 
     In some situations, multiple users may be present in the vicinity of device  10 . In this type of scenario, the information that is visually presented on device  10  and/or the audio information that is played for the user may be selected based on the attributes and preferences of the multiple users. As an example, when a first user is detected as being closer to device  10  than a second user, musical preferences associated with the first user may be prioritized over musical preferences associated with the second user. In response to detecting that a user with impaired hearing or vision is in the vicinity of device  10 , device  10  can take appropriate corrective action (e.g., by increasing playback volume, by enhancing the brightness or sharpness of displayed content, etc.). Users with color recognition deficiencies can be accommodated by performing color blind image correction operations on visual information displayed on the visual output device(s) of device  10 . 
     User proximity to device  10  may be measured using proximity sensors or other equipment. If desired, the identities of individuals in the vicinity of device  10  can be determined using facial recognition (e.g., by performing image processing operations on images captured with cameras in device  10 ). Camera data may also be used to measure the distance of users to device  10 . If desired, the distances of users to device  10  may be measured by measuring the distance of the user&#39;s device(s) to device  10  (e.g., by using time-of-flight or received-signal-strength radio-frequency measurements to determine whether a first user&#39;s wristwatch is closer to device  10  than a second user&#39;s wristwatch, etc.), and/or by measuring the locations of users using other techniques (echolocation, infrared cameras, gaze detection systems, capacitive proximity sensors, optical proximity sensors, etc.). 
     Device  10  may analyze a user&#39;s voice (e.g., when a user is supplying voice commands such as database queries and/or other commands to device  10 ). If vocal stress is detected in captured voice information, device  10  may make adjustments to content being presented to the user. For example, if voice loudness or stress patterns indicate that a user is stressed, the color and/or brightness of a lighting pattern on a visual output device in device  10  may be adjusted accordingly (e.g., to reflect elevated stress or to try to alleviate stress by creating a calming environment). In arrangements in which device  10  is displaying an avatar representing a digital assistant, the avatar (e.g., a humanistic avatar, a simplified graphical representation of a digital assistant such as an emoji-based avatar, etc.) may be adapted depending on the user&#39;s mood. If, for example, sadness is detected in the user&#39;s voice, the avatar may change accordingly (e.g., to a sad emoji to represent user sadness or to a happy emoji to counteract the detected sadness). The avatar can also be changed depending on the nature of content currently being presented to a user. If, for example, a user asks a digital assistant for information on purchasing a birthday gift, the digital assistant may use a happy emoji to present results. 
     Message content may be presented to a user with an avatar. For example, an avatar representing a virtual assistant may perform voice synthesis operations on the text of a received email. The voice synthesis operations may present the text of the email in audible form (vocalized words). Display(s)  14  may simultaneously present a moving representation of a face that is synchronized to the synthesized voice. The expression on the face (sad, happy, angry, etc.) may be selected based on a sender-selected emotion setting in the message and/or based on analysis of keywords in the text of the message. 
       FIG.  11    is a flow chart of illustrative operations involved in using device  10 . 
     During the operations of block  102 , device  10  may use sensors  20  and other user input devices such as buttons  18  to gather input from a user and from the environment surrounding device  10 . User input such as voice input and information on ambient sounds may be gathered during the operations of block  106 . At block  108 , device  10  may communicate with external equipment  30  (e.g., to gather online information such as weather, email, news, etc.). During the operations of block  104 , camera information may be gathered (e.g., by capturing images with one or more cameras to detect faces of individuals surrounding device  10 , to gather information on the operating environment of device  10 , etc.). 
     During the operations of block  110 , device  10  may take suitable action in response to the information gathered during blocks  102 ,  106 ,  108 , and  104 . For example, device  10  may supply audio output using speakers  22  and/or may use visual output devices  14  to supply visual output. Control signals for remote equipment  30  may also be produced or device  10  may otherwise interact with external equipment  30 . 
     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.