Patent Publication Number: US-8976085-B2

Title: Wearable device with input and output structures

Description:
BACKGROUND 
     Personal video or image displays are devices that are used to display an image received from a source for viewing by a single user. Such devices can be in the form of head-mounted displays that are worn on the head of a user and include one or more image sources over or in front of the user&#39;s eyes. Head-mounted displays can include an image source positioned adjacent and associated with each eye of the user or wearer and can be configured to present the same image, viewable as a single two-dimensional image. Alternatively, some such devices can be configured to present different stereoscopic images that are interpreted by the viewer as a single three-dimensional image. Regardless of the type of image presented to the user, such devices are usually blacked-out. That is, they almost entirely obstruct the wearer&#39;s vision outside of the screen or other image source included therein so that the user can see nothing but the image presented by the device&#39;s display system. 
     Other personal image displays can be what is referred to as a heads-up display, wherein the image is displayed on, in, or through a transparent display that superimpose the displayed image over a view of the surrounding environment. These allow the user to view the image presented by the display simultaneously with their surroundings. Such devices, however, can have many limitations, including in their fit and comfort to their wearers as well as limited functionality. 
     Both head-mounted and heads-up displays can be connected to a video source that receives a video signal that the device can read and convert into the image that they present to the user. The video source can be received from a portable device such as a video player, a portable media player or computers. Some such display devices are also configured to receive sound signals, which are delivered to the user typically through incorporated headphones. The functionality of these types of displays is, however, limited to passive actions wherein the display simply receives information from an external source and presents it to the wearer in limited forms. Accordingly, further advances in wearable devices including displays have been needed. 
     BRIEF SUMMARY 
     An aspect of the present disclosure relates to an electronic device including a band configured to be worn on the head of a user. The band has a central portion and first and second temple portions extending from opposing sides of the central portion. The central portion is configured to contact a portion of the face of a user, and the temple portions are configured to contact portions of the head of the user near respective ears thereof. The device also includes an operational unit having a display element and a housing having an arm portion affixed to the first temple portion of the band and defining a longitudinal axis. The housing also includes an elbow portion defining a display end of the housing that supports the display element such that the display element extends along a display axis that is angled with respect to the longitudinal axis and such that the display element is positionable over an eye of the user. The operational unit also has image generating means disposed within the housing and configured for generating an image presentable to the user on the display element. The display element can be a generally transparent prism configured to combine the image presentable to the user thereon with a user view through the display element. 
     The operational unit can further include an input device affixed to the housing and configured for receiving from the user an input associated with a function that is related to information that is presentable on the display element. In an example, the housing of the operational unit can define an outer wall, and the input device can include touch-sensitive circuitry disposed within the housing adjacent to the outer wall, the touch-sensitive circuitry being configured to receive a touch input from the user through the outer wall. In such an example, the touch-sensitive circuitry can be disposed behind a portion of the outer wall, and an outside surface of the outer wall can includes a texture defined therein in an area that overlies the touch-sensitive circuitry. 
     The display axis can be angled at between about 80° and 110° with respect to the longitudinal axis. Further, in an example, the arm portion and the elbow portion can be discrete elements rotatably affixed to each other about a rotation axis substantially parallel to the display axis such that the display element is adjustable toward and away from a brow area of the user&#39;s head by rotation of the elbow portion relative to the arm portion. In such an example, the rotation axis can be positionable such that it aligns with a focal center of the user&#39;s eye. The display element can include a planar viewing surface, and the rotation of the display element about the focal center of the user&#39;s eye can be such that the planar viewing surface remains substantially normal to a line extending therefrom to the focal center through a range of adjustment of the display element. 
     The arm portion of the housing can include a first track element that is configured to slideably attach with a second track element included on one of the first and second temple portions of the band. In such an example, the slidable engagement between the first and second track elements can be configured to allow adjustment of the display element toward and away from an eye of the user. 
     At least one electronic element can be disposed within an interior cavity of the band. In an example, the at least one electronic element can be electrically connected with the image generating means of the operational unit. 
     Each of the first and second temple portions can respectively define a first end and a second end in an embodiment wherein the band is of a flexible structure. In such an embodiment, the first end and second end can be moveable toward and away from each other to provide a securing force of the first and second temple portions against the respective portions of the head of the user. In an example, the band can include a flexible outer portion disposed around a more rigid and resiliently flexible structural member. In another example, the band can include a resiliently flexible structural shell that at least partially surrounds a pliable inner member. The pliable inner member can include an inner surface defining the portions of the band that are configured for contact with the face of the user and the head of the user. The structural shell can be disposed on a side of the band opposite the inner surface of the pliable member. 
     The portion of the face that the central portion is configured to contact can be a portion of the forehead of the user disposed toward the brow thereof. Alternatively, in an embodiment wherein the central portion of the band further includes a nosepiece depending therefrom, the portion of the face of the user that the central portion is configured to contact can be a portion of the nose of the user, and the nosepiece can makes such contact. 
     The device can further include a camera having a lens thereof. The camera can be attached to the operational unit such that the lens of the camera is exposed on the housing within the elbow portion thereof and is directed substantially parallel to the longitudinal axis. The operational unit can further include a button configured to receive from the user an input to direct the device to capture an image using the camera. The button can be positioned on the housing such that it is configured to be activated by the user by applying a pinching motion to the housing including contact with the button. The camera can alternatively be attached to the band such that the lens of the camera is exposed thereon and is directed substantially parallel to the longitudinal axis. The device can further include a plurality of cameras having respective lenses thereof, the cameras being attached to the band in an array thereof extending over a length of the band. 
     The device can further include an audio output device affixed to one of the temple portions of the band configured for contact with a portion of one of the user&#39;s ears. The output can further be configured to deliver an audio output of the device to the ear. 
     The band can further include a flexible retention member connected between the first and second temple portions at ends thereof opposite the central portion. The flexible retention member can define an interior cavity with conductive connections disposed therein. The conductive connections can be configured for connecting with a battery and to supply current from the battery to the image generating means. 
     Another aspect of the present disclosure relates to an electronic device including a band configured to be worn on the head of a user. The band includes a central portion and first and second temple portions extending from opposing sides of the central portion to respective ends thereof. The central portion is configured to contact a portion of the face of a user and the temple portions are configured to contact portions of the head of the user near respective ears thereof. The band further includes an electronics housing affixed on the end of the first temple portion and having a portion that is configured to extend around at least a portion of the respective ear of the user. The electronics housing contains an electronic element therein. The device further includes an operational unit including a display element. The operational unit also includes a housing having an arm portion affixed to the first temple portion of the band and defining a longitudinal axis. The housing also has an elbow portion defining a display end of the housing and supporting the display element such that the display element extends along a display axis that is angled with respect to the longitudinal axis and such that the display element is positionable over an eye of the user. The operational unit also includes image generating means disposed within the housing and configured for generating an image presentable to the user on the display element. The image generating means are electrically connected with the electronic element of the band. The operational unit can further include an input device affixed to the housing and connected with the at least one electronic element of the band. 
     The electronic element can include conductive connections configured for connecting with a battery to supply current from the battery to the image generating means. Additionally or alternatively, the electronic element can include electronic circuitry configured to perform a function associated with the device. 
     The operational unit can be positioned on a first side of the respective ear of the user such that it has a center of mass at a point disposed on the first side of the ear, and wherein the electronics housing is configured to extend around at least a portion of the same ear of the user, the electronics housing being configured to have a center of mass at a point disposed on a second side of the ear of the user. The electronics housing can be further configured such that an overall weight of the device, when being worn by the user, is distributed among the portion of the face of the user and the ear of the user such that a greater portion of the overall weight is applied to the ear. 
     Another aspect of the present disclosure relates to an electronic device including a band configured to be worn on the head of a user. The band includes a central portion and first and second temple portions extending from opposing sides of the central portion. The central portion is configured to contact a portion of the face of a user and the temple portions are configured to contact portions of the head of the user near respective ears thereof. The device also includes an operational unit having a display element and a housing. The housing has an arm portion affixed to the band and defining a longitudinal axis and an outer wall. The housing also has an elbow portion defining a display end of the housing and supporting the display element such that the display element extends along a display axis that is angled with respect to the longitudinal axis and such that the display element is positionable over an eye of the user. T Additionally or alternatively, the electronic element can include electronic circuitry configured to perform a function associated with the device. Image generating means are disposed within the housing and are configured for generating an image presentable to the user on the display element. Touch-sensitive circuitry is disposed within the housing adjacent to the outer wall. The touch-sensitive circuitry is configured to receive a touch input from the user through the outer wall, the input being associated with a function that is related to information presentable on the display element. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows an exemplary system for receiving, transmitting, and displaying data; 
         FIG. 2  shows an alternate view of the system of  FIG. 1 ; 
         FIG. 3A  shows an example system for receiving, transmitting, and displaying data; 
         FIG. 3B  shows an example system for receiving, transmitting, and displaying data; 
         FIG. 4  shows an example system for receiving, transmitting, and displaying data; 
         FIG. 5  shows a wearable computer device according to an embodiment of the present disclosure; 
         FIG. 6  shows the assembly of  FIG. 7  being worn on the head of a user; 
         FIG. 7A-7C  show the device of  FIG. 5  in exemplary adjustment configurations thereof; 
         FIGS. 8A and 8B  are schematic drawings illustrating aspects of the device of  FIGS. 7A-C ; 
         FIG. 9  shows an alternative embodiment of a wearable computer device according to another embodiment of the present disclosure; 
         FIG. 10  shows an exploded view of the device of  FIG. 9 ; 
         FIG. 11  shows an alternative embodiment of a wearable computer device according to another embodiment of the present disclosure; 
         FIG. 12  shows an alternative embodiment of a wearable computer device according to another embodiment of the present disclosure; and 
         FIG. 13  shows an alternative embodiment of a wearable computer device according to another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the present disclosure are described herein with reference to the drawing figures.  FIG. 1  illustrates an example system  100  for receiving, transmitting, and displaying data. The system  100  is shown in the form of a wearable computing device. While  FIG. 1  illustrates a head-mounted device  102  as an example of a wearable computing device, other types of wearable computing devices could additionally or alternatively be used. As illustrated in  FIG. 1 , the head-mounted device  102  comprises frame elements including lens-frames  104 ,  106  and a center frame support  108 , lens elements  110 ,  112 , and extending side-arms  114 ,  116 . The center frame support  108  and the extending side-arms  114 ,  116  are configured to secure the head-mounted device  102  to a user&#39;s face via a user&#39;s nose and ears, respectively. 
     Each of the frame elements  104 ,  106 , and  108  and the extending side-arms  114 ,  116  may be formed of a solid structure of plastic and/or metal, or may be formed of a hollow structure of similar material so as to allow wiring and component interconnects to be internally routed through the head-mounted device  102 . Other materials may be possible as well. 
     One or more of each of the lens elements  110 ,  112  may be formed of any material that can suitably display a projected image or graphic. Each of the lens elements  110 ,  112  may also be sufficiently transparent to allow a user to see through the lens element. Combining these two features of the lens elements may facilitate an augmented reality or heads-up display where the projected image or graphic is superimposed over a real-world view as perceived by the user through the lens elements. 
     The extending side-arms  114 ,  116  may each be projections that extend away from the lens-frames  104 ,  106 , respectively, and may be positioned behind a user&#39;s ears to secure the head-mounted device  102  to the user. The extending side-arms  114 ,  116  may further secure the head-mounted device  102  to the user by extending around a rear portion of the user&#39;s head. Additionally or alternatively, for example, the system  100  may connect to or be affixed within a head-mounted helmet structure. Other possibilities exist as well. 
     The system  100  may also include an on-board computing system  118 , a video camera  120 , a sensor  122 , and a finger-operable touch pad  124 . The on-board computing system  118  is shown to be positioned on the extending side-arm  114  of the head-mounted device  102 ; however, the on-board computing system  118  may be provided on other parts of the head-mounted device  102  or may be positioned remote from the head-mounted device  102  (e.g., the on-board computing system  118  could be wire- or wirelessly-connected to the head-mounted device  102 ). The on-board computing system  118  may include a processor and memory, for example. The on-board computing system  118  may be configured to receive and analyze data from the video camera  120  and the finger-operable touch pad  124  (and possibly from other sensory devices, user interfaces, or both) and generate images for output by the lens elements  110  and  112 . 
     The video camera  120  is shown positioned on the extending side-arm  114  of the head-mounted device  102 ; however, the video camera  120  may be provided on other parts of the head-mounted device  102 . The video camera  120  may be configured to capture images at various resolutions or at different frame rates. Many video cameras with a small form-factor, such as those used in cell phones or webcams, for example, may be incorporated into an example of the system  100 . 
     Further, although  FIG. 1  illustrates one video camera  120 , more video cameras may be used, and each may be configured to capture the same view, or to capture different views. For example, the video camera  120  may be forward facing to capture at least a portion of the real-world view perceived by the user. This forward facing image captured by the video camera  120  may then be used to generate an augmented reality where computer generated images appear to interact with the real-world view perceived by the user. 
     The sensor  122  is shown on the extending side-arm  116  of the head-mounted device  102 ; however, the sensor  122  may be positioned on other parts of the head-mounted device  102 . The sensor  122  may include one or more of a gyroscope or an accelerometer, for example. Other sensing devices may be included within, or in addition to, the sensor  122  or other sensing functions may be performed by the sensor  122 . 
     The finger-operable touch pad  124  is shown on the extending side-arm  114  of the head-mounted device  102 . However, the finger-operable touch pad  124  may be positioned on other parts of the head-mounted device  102 . Also, more than one finger-operable touch pad may be present on the head-mounted device  102 . The finger-operable touch pad  124  may be used by a user to input commands. The finger-operable touch pad  124  may sense at least one of a position and a movement of a finger via capacitive sensing, resistance sensing, or a surface acoustic wave process, among other possibilities. The finger-operable touch pad  124  may be capable of sensing finger movement in a direction parallel or planar to the pad surface, in a direction normal to the pad surface, or both, and may also be capable of sensing a level of pressure applied to the pad surface. The finger-operable touch pad  124  may be formed of one or more translucent or transparent insulating layers and one or more translucent or transparent conducting layers. Edges of the finger-operable touch pad  124  may be formed to have a raised, indented, or roughened  20  surface, so as to provide tactile feedback to a user when the user&#39;s finger reaches the edge, or other area, of the finger-operable touch pad  124 . If more than one finger-operable touch pad is present, each finger-operable touch pad may be operated independently, and may provide a different function. 
       FIG. 2  illustrates an alternate view of the system  100  illustrated in  FIG. 1 . As shown in  FIG. 2 , the lens elements  110 ,  112  may act as display elements. The head-mounted device  102  may include a first projector  128  coupled to an inside surface of the extending side-arm  116  and configured to project a display  130  onto an inside surface of the lens element  112 . Additionally or alternatively, a second projector  132  may be coupled to an inside surface of the extending side-arm  114  and configured to project a display  134  onto an inside surface of the lens element  110 . 
     The lens elements  110 ,  112  may act as a combiner in a light projection system and may include a coating that reflects the light projected onto them from the projectors  128 ,  132 . In some embodiments, a reflective coating may not be used (e.g., when the projectors  128 ,  132  are scanning laser devices). 
     In alternative embodiments, other types of display elements may also be used. For example, the lens elements  110 ,  112  themselves may include: a transparent or semi-transparent matrix display, such as an electroluminescent display or a liquid crystal display, one or more waveguides for delivering an image to the user&#39;s eyes, or other optical elements capable of delivering an in focus near-to-eye image to the user. A corresponding display driver may be disposed within the frame elements  104 ,  106  for driving such a matrix display. Alternatively or additionally, a laser or LED source and scanning system could be used to draw a raster display directly onto the retina of one or more of the user&#39;s eyes. Other possibilities exist as well. 
       FIG. 3A  illustrates an example system  200  for receiving, transmitting, and displaying data. The system  200  is shown in the form of a wearable computing device  202 . The wearable computing device  202  may include frame elements and side-arms such as those described with respect to  FIGS. 1 and 2 . The wearable computing device  202  may additionally include an on-board computing system  204  and a video camera  206 , such as those described with respect to  FIGS. 1 and 2 . The video camera  206  is shown mounted on a frame of the wearable computing device  202 ; however, the video camera  206  may be mounted at other positions as well. 
     As shown in  FIG. 3A , the wearable computing device  202  may include a single display  208  which may be coupled to the device. The display  208  may be formed on one of the lens elements of the wearable computing device  202 , such as a lens element described with respect to  FIGS. 1 and 2 , and may be configured to overlay computer-generated graphics in the user&#39;s view of the physical world. The display  208  is shown to be provided in a center of a lens of the wearable computing device  202 , however, the display  208  may be provided in other positions. The display  208  is controllable via the computing system  204  that is coupled to the display  208  via an optical waveguide  210 . 
       FIG. 3B  illustrates an example system  220  for receiving, transmitting, and displaying data. The system  220  is shown in the form of a wearable computing device  222 . The wearable computing device  222  may include side-arms  223 , a center frame support  224 , and a bridge portion with nosepiece  225 . In the example shown in  FIG. 3B , the center frame support  224  connects the side-arms  223 . The wearable computing device  222  does not include lens-frames containing lens elements. The wearable computing device  222  may additionally include an onboard computing system  226  and a video camera  228 , such as those described with respect to  FIGS. 1 and 2 . 
     The wearable computing device  222  may include a single lens element  230  that may be coupled to one of the side-arms  223  or the center frame support  224 . The lens element  230  may include a display such as the display described with reference to  FIGS. 1 and 2 , and may be configured to overlay computer-generated graphics upon the user&#39;s view of the physical world. In one example, the single lens element  230  may be coupled to the inner side (i.e., the side exposed to a portion of a user&#39;s head when worn by the user) of the extending side-arm  223 . The single lens element  230  may be positioned in front of or proximate to a user&#39;s eye when the wearable computing device  222  is worn by a user. For example, the single lens element  230  may be positioned below the center frame support  224 , as shown in  FIG. 3B . 
       FIG. 4  illustrates a schematic drawing of an example computer network infrastructure. In system  300 , a device  310  communicates using a communication link  320  (e.g., a wired or wireless connection) to a remote device  330 . The device  310  may be any type of device that can receive data and display information corresponding to or associated with the data. For example, 10 the device  310  may be a heads-up display system, such as the head-mounted device  102 ,  200 , or  220  described with reference to  FIGS. 1-3B . 
     Thus, the device  310  may include a display system  312  comprising a processor  314  and a display  316 . The display  310  may be, for example, an optical see-through display, an optical see-around display, or a video see-through display. The processor  314  may receive data from the remote device  330 , and configure the data for display on the display  316 . The processor  314  may be any type of processor, such as a microprocessor or a digital signal processor, for example. 
     The device  310  may further include on-board data storage, such as memory  318  coupled to the processor  314 . The memory  318  may store software that can be accessed and executed by the processor  314 , for example. 
     The remote device  330  may be any type of computing device or transmitter including a laptop computer, a mobile telephone, or tablet computing device, etc., that is configured to transmit data to the device  310 . The remote device  330  and the device  310  may contain hardware to enable the communication link  320 , such as processors, transmitters, receivers, antennas, etc. 
     In  FIG. 4 , the communication link  320  is illustrated as a wireless connection; however, wired connections may also be used. For example, the communication link  320  may be a wired serial bus such as a universal serial bus or a parallel bus. A wired connection may be a proprietary connection as well. The communication link  320  may also be a wireless connection using, e.g., Bluetooth® radio technology, communication protocols described in IEEE 802.11 (including any IEEE 802.11 revisions), Cellular technology (such as GSM, CDMA, UMTS, EVDO, WiMAX, or LTE), or Zigbee® technology, among other possibilities. The remote device  330  may be accessible via the Internet and may include a computing cluster associated with a particular web service (e.g., social-networking, photo sharing, address book, etc.). 
       FIGS. 5-15 , which do not adhere to the same numbering scheme used in  FIGS. 1-4 , illustrate an embodiment of a wearable device that can implement the various systems discussed above with reference to  FIGS. 1-4 .  FIG. 5  shows an embodiment of a device  410  that is wearable on the head of the user (as shown in  FIG. 6 ). As will be described in greater detail below, device  410  includes a band  412  that provides the desired fit of device  410  on a user&#39;s head. Device  410  further includes a boom  414  that extends from a portion of band  412  to a free end  416  thereof that includes a display element  454 . Boom  414  is affixed to band  412  such that when device  410  is properly worn by a user display  454  of boom  414  can be positioned adjacent the user&#39;s eye for making an image presented thereon viewable by the user. In this manner, the boom  414  is configured as a unit of the device  410  that carries out at least one operation of the device  410 , namely presenting an image to the user. Additional operations can also be carried out by boom  414 , which can also include an input device in the form of a touch-based input  470  that is accessible to the user to receive a touch input from the user to execute a control function of the device assembly  410  or a function of another electronic device that is connected or in communication with device assembly  410 . 
     Band  412  is shown in  FIG. 5  as having a unitary configuration that generally includes a central portion  430  with arms  440 A, 440 B extending away from opposite sides of the central portion  430 .  FIG. 6  shows an example of one position in which band  412  can be worn on a user&#39;s head. As shown, band  412  can be configured to fit on the head of a user with central portion  430  positioned over a portion of the face of the user. Specifically,  FIG. 6  shows central portion  430  in contact with the brow of the user such as by extending along a portion of the brow in contact therewith. In general, the user&#39;s face can be considered any portion with in the area defined vertically from the user&#39;s chin to the top of the forehead and horizontally from ear to ear. In the embodiment of  FIGS. 5 and 6 , the portion of the brow that central portion  430  makes contact with can vary, both depending on the size and shape of central portion  430  and the shape of the particular user&#39;s head. In an embodiment, the central portion  430  makes contact with enough of the brow to maintain the position of central portion  430  thereon, depending on the fit on the user&#39;s head achieved by other features of band  412 . Band  412  can be made of or otherwise be covered by a high-friction material, such as rubber, at least in the desired area for such contact. In an embodiment, central portion  430  is in an arched shape to accommodate the generally rounded shape of a human forehead. Band  412  can be constructed of a flexible material to allow central portion  430  to bend in response to different individual brow or head shapes. 
     Arms  440 A, 440 B can be configured to contact the head of the user along respective temples or in the area of respective ears of the user. Arms  440 A, 440 B include respective free ends  444  opposite central portion  430 . Free ends  444  can be positioned to be located near the ear of a user when wearing device assembly  410 . Ear portions  446  can be affixed to or integrally formed with the free ends  444  of the arms  440 A, 440 B. As shown in  FIG. 5  ear portions  446  can include an arched or curved form, as shown in the figures, such that they bend behind a portion of the back of the user&#39;s ear. As with eyeglasses, the particular shape of ear portions  446  can vary in many ways including the amount by which they bend, the distance around the ear which they extend and the amount of contact, if any, actually maintained with the outside of the ear. Arms  440  can be structured to appropriately position ear portions  446  relative to central portion  430  to achieve an appropriate fit for a user or a selection of different users. The shape of arms  440  can, accordingly, depend on the size and shape of central portion  430 . For example, arms  440  can extend substantially rearward from central portion  430  substantially perpendicular thereto and can be substantially straight. In other embodiments, arms  440  can be angled inward, outward, upward, or downward relative to central portion  430  and can further be curved in any direction (or multiple directions) to achieve a desired fit or aesthetic quality. 
     As mentioned previously, earpieces  446  can be integrally formed with band arms  440  or can be separate elements that can be pre-assembled with arms  440 . Alternatively, a number of different earpieces  446  can be provided that can be removably attached to ends  444  of arms  440  according to fit or the user&#39;s preferences. In such configurations, earpieces  446  can be made of different materials or material combinations than the remainder of band  412 . In a further embodiment, earpieces  446  can extend substantially in-line with arms  440  or can extend inward therefrom, rather than downward, to a position where they rest over the ear on a topmost area thereof but do not hook around the ear. In such an embodiment earpieces  446  or arms  440  can be configured to exert a pressure against the side of the user&#39;s head to at least partially retain frame  412  on the user&#39;s head using friction generated through the pressure. 
     Band  412  can be made from a resiliently flexible material or combination of materials. Such a construction can permit arms, including ends  444  thereof to flex outwardly away from each other to accommodate heads of different sizes. Further, the structure can be configured so that at a resting, or un-flexed, position (such as when not being worn) band  412  is somewhat smaller than necessary to accommodate the smallest size head (within a given range of head sizes) that band  412  is intended to be worn on. This may require some degree of flexing by band  412  when worn, resulting in band  412  applying a force against the user&#39;s head due to its tendency to return to its undersized resting position. Such a force can help retain band  412  on the user&#39;s head, with or without the further retention provided by earpieces  446 . As with central portion  430 , at least a portion of the arms  440 , such as the areas thereof that make contact with the user&#39;s head, can be made from or otherwise coated with a rubber or another high-friction material. The use of rubber or the like in these contact areas can also increase the comfort to the user by spreading out the contact more evenly. Such a structure can achieve at least three points of contact with the user&#39;s head, which can give a desired level of stability to the assembly  410 , when worn. Band  412  can be further configured to provide additional points of contact, such as two points of contact within central portion  430  or continuous contact along the user&#39;s head. These types of fit can also result from the particular shape of the user&#39;s head. 
     Suitable materials for band  412  to achieve the above-described characteristics include various plastics, which can be overmolded, co-molded, or insert molded with rubber, such as thermoplastic elastomer (“TPE”) materials in the desired contact areas or covering any relatively harder plastic entirely. Additionally, rubber or TPE can be molded or assembled over metal, such as spring steel or the like. In such an embodiment, a high yield strength metal, such as spring steel can be used to prevent plastic (or permanent) deformation of the desired shape of band  412 . Similarly, earpieces  446  can be made from plastic or metal and can be at least partially coated with or covered by rubber or TPE elements for increased friction or comfort. 
     In variations of the band described above, central portion  430  and arms  440 A and  440 B can each be separate elements that can be affixed together. In one embodiment, arms  440 A, 440 B can be affixed to central portion  430  by hinges to allow the structure to be folded for storage or transportation. Such hinges can be spring-loaded to permit flexure therein instead of in central portion  430  or arms  440 A, 440 B. 
     In the embodiment shown, boom  414  includes a housing  452  that extends from band  412  at an arm portion  476  that can be elongated and to extend away from band  412  to an elbow portion  450  that supports display  454  at an angle relative to arm  476  (which is shown having an elongated shape so as to define a longitudinal axis therethrough). As shown in the figures, display  454 , which is also elongated and generally defines a display axis, can extend relative to arm portion  476  at an angle that can range from about 80° to about 110°. In an embodiment, display  454  is angled with respect to arm portion  476  at approximately 90°. Elbow portion  450  can be curved, as shown in the figures, or can include a bend formed by a sharp corner or can be configured such that display  454  projects directly outwardly from near arm portion  476  at the desired angle. In an embodiment, the image source associated with display  454  and its related circuitry can be held within housing  452  in elbow portion  450  thereof. Touch-based input can be positioned within arm portion  476  such that, when display  454  is positioned over a user&#39;s eye, arm portion  476  is positioned in a position that extends over the user&#39;s temple adjacent that eye. 
     In the embodiment shown, display  454  is in the form of a generally-transparent prism that is configured to overlay or combine with the user&#39;s sight an image generated by electronic display components that are positioned within the housing  452 . Such a prism can be structured to receive a projected image in a receiving side  458  and to make that image visible to a user by looking into a viewing side  460  of display  454 . This can be done by configuring display  454  with a specific shape and or material characteristics. In the embodiment of  FIG. 5  the receiving side  458  of display  454  is adjacent to or within housing  452  such that the electronic components inside housing  452  can contain a video projector structured to project the desired video image into receiving side  458  of prism  454 . Such projectors can include an image source such as LCD, CRT, and OLED displays and a lens, if needed, for focusing the image on an appropriate area of prism  454 . The electronic components associated with display  454  can also include control circuitry for causing the projector to generate the desired image based on a video signal received thereby. Other types of displays and image sources are discussed above and can also be incorporated into boom  414 . Further, a display can be in the form of a video screen consisting of, for example, a transparent substrate. In such an example, the image generating means can be circuitry for a LCD display, a CRT display or the like positioned directly behind the screen such that the overall display is not transparent. The housing of the boom can extend behind the display and the image generating means to enclose the image generating means in such an embodiment. 
     The receiving surface  458  of display  454  can be perpendicular to the viewing surface  460  of prism  454  such that a transparent prism can be used to combine the projected image with the view of the environment surrounding the wearer of the device. This allows the user to observe both the surrounding environment and the image projected into prism  454 . The prism  454  and the display electronics can be configured to present an opaque or semi-transparent image, or combinations thereof, to achieve various desired image combinations. 
     Boom  414  is attached to band  412  in a manner to properly position display  450  at a distance away from the user&#39;s eye. As shown in the embodiment of  FIG. 5 , arm portion  476  is configured to be positioned over a temple of the user&#39;s head when being worn. In such a position, arm portion  476  is positioned adjacent a corresponding arm  440 A or  440 B of band  412 . Accordingly, boom  414  can be attached to band  412  at a location between the arm portion  476  of the boom  414  and a corresponding arm  440 A or  440 B of band  412 . In an example, arm portion  476  can be affixed to and extend away from band  412  along a longitudinal axis of the arm portion  476  that is tangent to a portion of the arm  440 A or  440 B at the point of attachment. Arm portion  476  can, thus, diverge from band  412  as the band  412  curves inward to contact the user&#39;s brow along the central portion  430  thereof and as arm portion  476  continues to extend forward to extend along its longitudinal axis. This can allow for at least approximately appropriate positioning of display  454  over the user&#39;s eye on the side of the arm  440 A or  440 B to which the boom  414  is attached given the angle at which elbow portion  450  positions display  454  relative to arm  476  of housing  452 . 
     Boom  414  can attach to band  412  using any one of a number of different structures. In one embodiment, boom  414  can be integrally formed with band  412  at a converging point therebetween. In a similar example, a portion of the housing  452  of boom  414  (such as an inside portion thereof that is positioned adjacent the user&#39;s head when being worn) can be integrally formed with the band  412 . In such an example, the remaining portions of housing  452  can then be assembled therewith using screws, snap-fit or press-fit structures, adhesive, ultrasonic welding or the like. In other embodiments, boom  414  can be attached to band  412  using screws or other fasteners or snap-fit or press-fit structures located on mutually-engaging portions thereof. Further structures are possible that allow for some degree of adjustment between the boom  414  and the band  412 . For example, a sliding joint can be used to attach boom  414  to band  412 . Such a sliding joint can be in the form of a dovetail or similar joint within an element that serves as a track or guide and another element that engages the track or guide. Rotating joints are also possible and can be implemented using the previously-discussed screw or snap-fit structures. Other attachment structures are discussed below with reference to further embodiments of the present disclosure. 
     It is also noted that, although the embodiment of  FIG. 5  shows a boom  414  that is attached to band  412  such that it is positioned over the left eye of a user when being worn, other similar embodiments are possible in which a mirror-image of boom  414  can be attached on an opposite side of band  412  to make it positionable over the right eye of the user. Depending on the application of device assembly  410  or individual user preferences, it may be desirable to position boom  414  on a particular side of the user&#39;s head. For example, a right-handed person may prefer having the boom  414  on the right side of her head to make interaction with touch-based input  470  easier. In another example, a person may prefer to have the display  454  over a dominant eye for easier interaction with elements presented on display  454  or over a non-dominant eye to make it easier to shift his focus away from elements presented on display  454  when engaged in other activities. 
     As shown in  FIGS. 5 and 6 , boom  414  can be attached to or otherwise formed with band  412  such that boom  414  is positioned beneath band  412  when in a position as when worn on a user&#39;s head. This configuration can be advantageous due to the relative positions desired for display  454  and central portion  430  of band  412 . In particular, with central portion  430  in a position over the brow of the user, it may be desired to have display  454  positioned vertically below central portion  430  such that it is in at least a portion of the user&#39;s line of sight. Accordingly, in an embodiment this positioning is achieved by attaching boom  414  to band  412  such that boom  414  is vertically beneath band  412 , with exception made for any interacting attachment elements of band  412  or boom  414 . Other arrangements are possible, such as boom  414  attaching to band  412  in an overlapping manner, with boom  414  positioned to the outside of band  412  at the point of attachment. In such an arrangement, boom  414  can angle downward, as necessary, to appropriately position display  454  relative to the user&#39;s eye. This arrangement can also be used to provide an assembly  410  that can be “flipped” to be worn with display  454  over either eye, with boom  414  being appropriately rotated to be positioned beneath band  412  regardless of the orientation of band  412  on the user&#39;s head. 
     As mentioned previously, boom  414  can be made adjustable with respect to band  412  such that the user can wear band  412  on his or her head in a comfortable position and can then make adjustments to place display  454  in a desired or appropriately functional position. For example, the user may desire to position display directly in her line of sight (both vertically and horizontally) or may desire to have display  454  positioned above, below, or to the outside of his line of sight. Such positioning may vary depending on how the user is using device  410 , making on-the-fly adjustments useful for some applications. In other embodiments, such adjustment can be made within boom  414  itself, allowing a fixed attachment between boom  414  and band  412 , while still permitting similar adjustments. 
     In the embodiment of  FIGS. 5-7 , housing  452  is divided into a display housing  475  and an arm housing  476 . As shown, display housing  475  defines elbow portion  450  and has display  454  mounted thereon. Arm housing  476  substantially defines the arm portion of boom  414  and can include touch-based input  470 , which can be a discrete element or can be an operable surface  474  of housing  452 , as described above. In an embodiment, the display portion  475  and arm portion  476  of housing  452  can be covered by a compliant outer layer (not shown). This outer layer can be made from a rubber material, for example, and can cover any joint between the two housing portions to give boom  414  a clean and uniform look. A rotating joint between display portion  475  and arm portion  476  can be used and can be formed by a separate element such as a pin or by integrally-formed features such as a post and a mating hole that can snap together. Additionally, an armature wire or a ball-and-socket joint can be assembled between the display portion  475  and the arm portion  476  to allow adjustment along additional axes. Such joints can also be covered by a compliant outer layer. 
     In this embodiment, display housing  475  can be rotatably affixed to arm housing  476 . Boom  414  can then be attached to band  412  by any of the structures discussed herein. The rotation of display housing  475  can implement an additional or alternative form of adjustment for the position of display  454  relative to the user&#39;s eye. As shown in  FIG. 7B , display housing  475  can be rotated upward relative to arm housing  476 . Further, as shown in  FIG. 7C , display housing  475  can be rotated downward relative to arm housing  476 . In an embodiment, the point of rotation  484  between display housing  475  and arm housing  476  can be positioned near the focal center of a user&#39;s eye. This can be approximated based on predetermined non-adjustable attachment structures on bands of varying sizes, as discussed above, or can be done though forward- and backward-adjustable attachment structures, such as those described above and also below with respect to  FIG. 9 . 
     As shown in  FIGS. 8A  and B, in certain structures of display  454 , such as certain display configurations (including the use of some types of prisms), it can be beneficial to orient display  454  such that viewing surface  460  is normal to a line from the image location within display  454  to the focal center of the user&#39;s eye. By allowing rotation of display housing  475  and, thus, display  454  to rotate relative arm housing  476 , the display  454  can be positioned in an optimal angle for viewing by users with different facial structures and different preferences for the horizontal or vertical position of display  454  or band  412 .  FIG. 8A  shows display  554  at a location above the horizontal center  492  of the user&#39;s eye  490 . Display  454  is pivoted or otherwise rotated about axis  484  that extends in a lateral direction relative to the user&#39;s face (in and out of the page of  FIG. 8A ) such that surface  460  is perpendicular to a line  494  extending between surface  460  and the focal center  496  of the user&#39;s eye  490 . It is noted that the diagram shown in  FIG. 8A  is only an example and different users can have different locations of their eye&#39;s focal center.  FIG. 8B  shows display  454  positioned vertically near the horizontal center  492  of the user&#39;s eye with display rotated accordingly for optimal viewing by the user, as described above. 
     As discussed above, an input device in the form of a touch-based input  470  is also desirably included in boom  414 . Touch-based input  470  can be a touchpad or trackpad-type device configured to sense at least one of a position and a movement of a finger via capacitive sensing, resistance sensing, or a surface acoustic wave process, among other possibilities. Touch-based input  470  can further be capable of sensing finger movement in a direction parallel or planar to a surface thereof, in a direction normal to the surface, or both, and may also be capable of sensing a level of pressure applied. Touch-based input  470  can be formed having an outer layer of one or more insulating, or dielectric, layers that can be opaque, translucent, or transparent and an inner layer of one or more conducting layers that can be opaque, transparent, or translucent. 
     In an embodiment, the outer layer of the touch-based input  470  can be a portion of an outer wall  453  of housing  452 . This can provide a seamless or uniform incorporation of touch-based input  470  into housing  452 . The housing can define an interior cavity for containing the inner layer of the touch-based input  470  and any electrical structures, such as control circuitry, associated therewith. The outer layer of the touch-based input  470  can include the entire wall  453  or a selected operable area  472  in the form of one or more touch-surfaces  470  thereof, as dictated by the size, shape, and position of the inner layer of the touch-based input  470 . If a portion of the housing is to be used as the outer layer of the touch-based input  470 , then the housing  452  can be made of a dielectric material such as plastic. In an alternative embodiment, the touch-based input can be a discrete element that is mounted in an opening in the housing  452  that includes its own dielectric outer layer, separate from wall  453  to define the operable area within a window or opening through wall  453  in a manner similar to a touchpad on a laptop computer. 
     In the embodiment shown, touch-based input  470  is positioned on arm portion  476  and defines a vertical plane that overlies a portion of the side of the user&#39;s head. Accordingly, touch-based input  470  may not be visible to a user of the assembly  410 , when it is being worn. To help the user identify any operable areas  472  of touch-based input  470  the housing  476  can be formed to have a texture provided by a raised, indented, or roughened surface so as to provide tactile feedback to a user when the user&#39;s finger contacts the touch surface  472 . Such a texture can define the boundaries of the operable area  472 , can be consistent through the operable area  472 , or can vary along horizontal and vertical lengths of the operable area  472  to give the user feedback as to the location of a finger contacting operable area  472 . 
     Touch-based input  470  can also include additional operable areas  472  on wall  453  or on other portions of housing  452 , such as the top or bottom surfaces thereof. This can be achieved by positioning capacitive sensor layers, for example, beneath the selected housing surfaces. In other embodiments, additional touch-based inputs can be provided in different locations of boom  413  such as on elbow portion  450 . Each of the touch-based inputs  470  can be operated independently, and can provide different functions. Additionally, housing  452  can include additional input structures, such as a button  474  that can provide additional functionality for boom  414 , including implementing a lock or sleep feature or allowing a user to toggle the power for boom  414  between on and off states. 
     Touch-based input  470 , or another type of input, can be used to provide a control function that is executed by boom  414 , such as by an on-board CPU or a CPU mounted to or within an associated wearable structure, or by a remote device, such as a smartphone or a laptop computer. In an embodiment information related to the control function is viewable by the user on display  454 . In one example, the control function is the selection of a menu item. In such an example, a menu with a list of options can be presented on display  454 . The user can move a cursor or can scroll through highlighted options by predetermined movement of a finger along touch-based input  470  and can confirm the selection by a different movement, the acceptance of the selection being indicated by the display. Examples of menu item selections can include whether to answer or decline an incoming call on a remotely-linked smartphone or to scroll or zoom-in on a map presented in display. 
     Additional input structures can be included in boom  414 . These can include a camera  426  and a sensor  428 , as shown in  FIG. 5 . The camera can be used to take picture or record a video at the user&#39;s discretion. The camera can also be used by the device to obtain an image of the user&#39;s view of his or her environment to use in implementing augmented reality functionality. The sensor  428  can be, for example a light sensor that can be used by firmware or software associated with the camera  426 . As shown in  FIG. 5 , the camera and sensor can be included in a housing  452  positioned within the elbow portion  450  and facing in a direction substantially perpendicular to viewing surface  460  of display  454 . In such an arrangement, camera  426  is positioned to face in a direction along the user&#39;s line of sight, and sensor  428  is positioned to sense light within the view of the camera  426 . Other locations for the camera  426  and sensor  428  are also possible. In an example, a camera or multiple cameras can be positioned in band  412 . Such an arrangement can include a single camera positioned near the central portion  430  such as in a position configured to be located between the user&#39;s eyes when device  410  is being worn. In another arrangement, a camera can be positioned on band  412  such that each camera is aligned with a respective eye of the user when device  410  is being worn. In yet another arrangement, a series of cameras can be spaced apart at regular intervals along a length of band  412 , such as across central portion  430 . In such an arrangement, sensors can  428  be interspersed between cameras  426 . Similarly, sensors can be positioned in band  412  near any cameras positioned therein in any other locations discussed. 
     In an embodiment, button  474  can be configured to receive an input from the user to direct device  410  to capture an image using camera  426  or one of multiple cameras of device  410 . In an embodiment, the control circuitry or software within device  410  can allow the user to select one or a plurality of multiple cameras with which to capture an image or “take a picture” before receiving an input using button  474  to actually capture the image using the selected camera. Button  474  can be positioned on boom  414  along the top surface  467  of housing  452 . Such positioning can allow for the user to grasp housing  452 , for example, using the user&#39;s thumb positioned opposite from top surface  467 , with the user&#39;s index finger to press on button  474  in a pinching motion. This action can be similar to the motion used to activate a shutter in a conventional camera (e.g. a point-and-shoot or an SLR camera) or a motion used by people to mimic such a motion, making the use of button  474  to take a picture with camera  474  more intuitive to a user. Additionally, the positioning of button  474  to be pressed in the above-described pinching motion can result in a more stable activation of button  474 , wherein the user&#39;s thumb provides support for boom  414  when button  474  is pressed. Such stability can be further enhanced by configuring button  474  with a low activation pressure such that the force applied thereto is low enough to not cause boom  414  to move during image capture. 
     As mentioned previously, housing  452  can contain electronic circuitry such as the circuitry for touch based input  470 . In addition housing  452  can include control circuitry for the image source associated with display  454 , the camera  426 , or the sensor  428 , or one or more circuit boards including a processor to control display  454 , touch based input  470  or to perform other functions for boom  414 . Housing  452  can further include a power source, such as a battery to power the other circuitry. Additionally housing  452  can include memory, a microprocessor or communications devices, such as cellular, short-range wireless (e.g. Bluetooth), or WiFi circuitry for connection to a remote device. Additionally, any such circuitry can be included in band  414  such as in at least one of the earpieces  446 , for example in an internal cavity thereof. As shown in  FIG. 7 , earpiece  446  can be configured to be positioned behind or over the ear of the user while being worn. Earpiece  446  can be further configured to contact a portion of the user&#39;s head to help secure the position of device assembly  410 . Earpiece  446  can be configured to include a battery or multiple batteries of various forms, such as AAA, AA, or 9-volt style batteries. The battery can also be a rechargeable battery such as a lithium-ion or nickel-cadmium battery and can be removable by the user or can be permanent or semi-permanent. Earpiece  446  can also include a port (not shown) that can be used to connect device assembly  410  to a power source to recharge a battery without removal thereof or to connect device  410  to a remote device for communication therewith, such as described above, or to update or install software or firmware included in the memory of device  410 . 
     Earpiece  446  can be configured and positioned to provide a balancing weight to that of boom  414 . Boom  414  is positioned forward of the user&#39;s ear, which can cause a portion of its weight to be supported over the brow of the user. By adding weight behind the user&#39;s ear (or shifting weight to behind the user&#39;s ear) in the form of earpiece  446 , the ear becomes a fulcrum about which the weight of boom  414  is balanced against that of the earpiece  446 . This can remove some of the weight on the user&#39;s brow, giving a more comfortable, and possibly a more secure fit with reduced potential slipping of central portion  430  downward on the user&#39;s brow. The components within earpiece  446 , such as a battery or various control circuitry can be arranged to contribute to a desired weight distribution for device assembly  410 . For example, heavier components, such as a battery, can be placed toward or away from boom on arm  440 A to adjust the weight distribution. In an embodiment, a majority of the weight can be carried by the ear of the user, but some weight can still be carried by the brow in order to give the device a secure feel and to keep the central portion  430  in a desired position on the brow to maintain a desired position for display  454 . In an embodiment, between 55% and 90% of the weight of device assembly  410  can be carried by the user&#39;s ear. 
     In a commercial setting, a number of different devices similar to device  410  can be made available having respective bands  412  that are configured to fit different ranges of head sizes, such as “small”, “medium”, and “large”. Similarly, variations for left-eye boom position and right eye boom positions within the various sizes can also be made available. Further embodiments are also possible wherein various booms and bands are interchangeable and can be individually sold. Further variations of devices can be made available with bands offering different fit styles (such as with earpieces or without or in varying shapes) or colors. 
     In the present example, a single boom  414  is shown extending from band  412 . Alternatively, two booms could be included, with one affixed on each arm  440 A and  440 B of band  412  and corresponding to each eye of the user. As a further alternative, a single display  454  could be used with a prism or other structure configured to extend over both eyes of the user for displaying an image viewable by both eyes. 
     In the embodiment shown in  FIG. 9 , device  510  has a band  512  that includes a compliant inner portion  538  and a resilient outer portion  548 . This arrangement is further illustrated in the exploded view of  FIG. 10 . Inner portion  538  can include any portions of the band  512  that are intended to contact the user&#39;s head. In the particular embodiment shown, inner portion  538  can define the entire inner surface  539  of band  512  to ensure that the compliant material of inner portion makes contact with the user&#39;s head regardless of the area of band  512  along which contact is made with the user&#39;s head. Inner portion  538  can be made of any material that can provide a degree of compliance to enhance the comfort of the fit of band  512  on the user&#39;s head while being able to retain its general shape. Acceptable materials include various foams, such as foam rubber, neoprene, natural or synthetic leather, and various fabrics. In an embodiment, inner portion  530  is made from an injection-molded or cast TPE. The compliance of the material of inner portion  530  can be measured by the durometer of the material. In an example, inner portion  438  can be made from a TPE having a durometer of between 50 and 70. Inner portion  538  can also be formed having a hollow passage therethrough or a channel formed therein opposite inner surface  539 . Such a passage or channel can be used to route any wiring associated with boom  514 . For example, in an embodiment a battery (not show) can be housed in one of the earpieces  546  of band  512  that can be connected with the internal components of boom  514  to provide power therefor. This connection can be made by wired routed through a channel or hollow passage through inner portion  538 . 
     Outer portion  548  of band  512  can be made of a resiliently flexible material such as metal or plastic. In general, the nature of such a material should be such that outer portion  548  can maintain the desired shape for band  512  while allowing some flexibility so that band  512  can expand to fit on a user&#39;s head while applying a comfortable pressure thereto to help retain band  512  on the user&#39;s head. In some embodiments, outer portion  548  can be elastically deformable within a range that will allow it to be worn as such on a user&#39;s head and plastically deformable above the elastically deformable range to allow the user to make adjustments to the shape of band  548 . In other embodiments, outer portion  548  is elastically deformable up to a sufficiently high threshold that a user is sufficiently unable to permanently alter the shape of band  512 . Acceptable materials for outer portion  548  include metals such as aluminum, nickel, titanium (including grade  5  titanium), various steels (including spring steel, stainless steel or the like), or alloys including these and other metals. The thickness of outer portion  548  can be adjusted, depending on the material used, to give the desired flexibility characteristics. 
     As shown in  FIG. 9 , inner portion  538  can have a profile such that it at least partially fits within a channel  549  formed by outer portion  548 . In the example shown, inner portion  538  can be sized to fit within channel  549  along a relatively narrow portion thereof opposite inside surface  539 . Inner portion  538  can then extend inward past outer portion  548  and can be relatively wider along such a portion, which can include inner surface  539 . Channel  549  can be configured to also accept any wiring of band  512  therein or to close a partially open channel formed in inner portion  539  to hold such wiring. 
     Further, in the embodiment shown in  FIG. 9 , earpieces  546  can be integrally formed with inner portion  538  and can extend beyond ends  544  of outer portion  548 . In these embodiments, inner portion  538  can include internal support within the portions thereof that form earpieces  546 . Such internal support can include electronics housings that can contain batteries or other electronic circuitry associated with device  510 . The internal support can also include resilient members such as spring elements (not shown) to help provide flexion of band  512  and retention pressure against a wearer&#39;s head. Such spring elements can also be plastically deformable to allow for user adjustment of the earpieces  546 . Lengths of armature wire can be used to provide such characteristics. Any internal support within earpieces  546  can extend into the area of inner portion  538  that is within outer portion  548  to provide additional support therefor. 
       FIG. 9  shows an example of a boom  514  that is in a configuration to fit over a right eye of a user in a general form that is a mirror image of a form such at that of  FIG. 5  that is configured for use over a user&#39;s left eye. As with the embodiment of  FIGS. 5-7 , the embodiment of  FIG. 10A  can be mirrored or inverted in a version that can be worn over the user&#39;s left eye. 
     In the embodiment shown in  FIG. 9 , the attachment feature  532  of band  512  includes a track  536  that extends along a length of arm  540 A. The attachment between boom  514  and band  512  can be configured to allow adjustment between the relative positions of band  512  and boom  514 . Boom  514  includes an attachment feature  532  including a screw  566 , the shank of which fits within track  536  with the head of screw  566  extending outward along the body of the attachment feature  532 . In such an arrangement, boom  514  can be affixed to attachment feature  532  using screw  566  such that boom  514  can be moved forward and backward relative to band  512  by sliding screw  566  within track  536 . Such adjustment can provide various forms of “eye relief” such as by compensating for different eye positions such as for users with deep-set eyes or with eyes positioned relatively close to brow. Additionally, the eye relief provided by the forward and backward adjustability of attachment  532  can allow display  554  to be positioned clear of the user&#39;s eyelashes including those of users with relatively long eyelashes. Screw  566  can then be tightened into housing  552  to secure the position of boom  514  relative to band  512 . Housing  552  can be configured to permit some rotation of boom  514  relative to attachment portion  532  such that the rotational position of boom  514  can also be fixed by tightening screw  566  into housing  552 . This attachment can also incorporate a spring (not shown) or the like positioned between housing  552  and attachment feature  532  such that boom  514  is biased away therefrom. This can allow the lateral position of boom  514 , and thus display  554 , to be adjusted by tightening screw  566 , which can draw housing  552  closer to attachment feature  532 . In either arrangement, boom  514  can be such that it can be disassembled from band  512  by loosening screw  566  until it is removed from housing  552 . In other embodiments, the screw  566  can have a stopper or similar structure on the end thereof that is within housing  552  such that screw  566  cannot be removed and, thus boom  514  cannot be detached from band  512 . Track  536  can include conductive features such as exposed wire segments or traces partially embedded therein that can align with further conductive features positioned on housing  552  of boom  514  to allow connection between electronic elements in the band  512  and the electronic components (including the image source or touch-based input  570 ) in boom  514 . In other embodiments, an external wire (not shown) can extend out from band  512  and plug into an outlet (not shown) on boom  514  to achieve a desired electrical connection therebetween. Band  512  can include additional wires that run through at least a portion thereof to further connect such components that may be located remotely from each other. 
       FIG. 11  shows an alternative embodiment of device  610  in which band  612  includes a nosebridge  620  affixed to central portion  630  thereof to provide support for central portion  630  on the nose of a wearer, rather than the wearer&#39;s brow. In the embodiment shown, nosebridge  620  includes a pair of bridge arms  622  that extend from the central portion  630 . In the view of the embodiment of device assembly  610  shown in  FIG. 11 , bridge arms  622  extend in a downward direction from central portion  630 . As in other figures, the orientation of device assembly  610  shown in  FIG. 12  generally corresponds to the orientation of device  610  when being worn by a user when the user&#39;s head is in a neutral, upright position. The description of bridge arms  622  extending downward from central portion  630  is made in such a reference frame and is done for purposes of the present description. Discussion of any other relative reference directions is also made for similar purposes and none are intended to be limiting with respect to the present disclosure, unless explicitly stated. 
     Bridge arms  622  can include respective pads  624  thereon, which can be positioned to rest on parts of the nose of the wearer. Pads  624  can be made of a material that is softer than arms  622  for purposes of comfort. Additionally the material that pads  624  are made from can be flexible or have a texture that prevents slippage along the surface of the user&#39;s nose. Bridge arms  622  can be flexible to further provide a comfortable fit and or grip on the user&#39;s nose. Further, bridge arms  622  can be deformably bendable and repositionable so that the position of pads  624  can be changed to best fit the user. This can include movement closer together or farther apart or fore and aft relative to central portion  630 , which can adjust the height of central portion  630  and, accordingly, the position of boom  614  and its display  654  relative to the user&#39;s eye. Further adjustment of display and other structures thereof can be similar to those in the embodiments described above, as can the structures used to affix boom  614  to band  612 . In other embodiments, structures similar to arms and pads can be integrally formed with central portion  630  and can be structured such that larger or smaller areas of the nosebridge  620  contact the nose of the user, compared to the embodiment shown. A device  610  of this type can allow for weight distribution configurations (as discussed above with respect to  FIGS. 5-7 ) in which more weight can be distributed on the front side of the user&#39;s ear. In an example, in such a configuration, up to about 60% of the weight of device  610  can be supported by a wearer&#39;s nose through contact with nosebridge  620 . 
     Additional components can be included in the various device assemblies described herein. These components can include additional inputs, control circuitry boards, antennae or the like. The various locations in which these additional components are located on or in such a device assembly can also be selected to allow for a predetermined weight distribution. Some examples of additional components are shown in  FIGS. 12 and 13 . The embodiment of device  710  in  FIG. 12  includes a band  612  that wraps entirely around the head of a wearer. In such an embodiment, the wraparound portion  684  can be integrally formed with band  612  or with a portion of band (such as an inner portion  538  shown in  FIGS. 9 and 10 ). Alternatively, wraparound portion  684  can be a separate structure that can be assembled with a band  612  in place of earpieces (such as earpieces  446  in  FIG. 5 ) that can themselves be removably assembled with band  412 . Wraparound portion  684  can be configured for a secure fit in contact with the back of a wearer&#39;s head to help hold device  610  in position thereon (such as during activities requiring a great deal of movement). Alternatively, wraparound portion  684  can be relatively looser fitting when device  610  is worn in an operational position, allowing the user to remove device  610  from the user&#39;s head and continue to wear the device around his or her neck. Wraparound portion  684  can be configured to house one or more batteries to provide electrical current for device  610  and internal connections and wiring for carrying such current. In an example, wraparound portion  684  can house one or more flexible battery structures to allow wraparound portion  684  to bend or flex, such as to conform to the user&#39;s head or neck. 
       FIG. 14  shows an embodiment of device  710  with earphones  790  integrated with band  712 . In the embodiment shown, earphones  970  are connected by wires  792  to the end of earpieces  746 . This arrangement can allow for earpieces  746  to be swapped with other earpieces discussed herein (such as earpieces  446  in  FIG. 5 ) such that the user can selectively utilize device  710  with or without earphones  790 . Earphones  790  can allow device  710  to present audio to the wearer that can, for example be associated with information presented on display  754 . In an example, the device  710  can give a vocal request for the user to make a selection from items presented in a list on display  745 . Earphones  790  can also allow for music or the like to be played through device  710 . Such music can be stored in internal memory of device  710  or can be stored in memory of another connected device such as a smartphone or a computer or can stream to device  710  over the internet. Additionally, the earphones  790  can present the audio from a telephone call transmitted from a phone via Bluetooth™ or the like. 
     Although the description herein has been made with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present disclosure. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present disclosure as defined by the appended claims.