Patent Publication Number: US-2012033142-A1

Title: User-Wearable Video Displays, Systems and Methods

Description:
RELATED APPLICATIONS 
     This application claims the priority of: U.S. Provisional Patent Application Ser. No. 61/147, 682, filed Jan. 27, 2009; U.S. Provisional Patent Application Ser. No. 61/166,832, filed Apr. 6, 2009; and U.S. Provisional Patent Application Ser. No. 61/170,882, filed Apr. 20, 2009; the entire disclosures of which are specifically incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to video display devices, and, more particularly, but not by way of limitation, to user-wearable video display devices, systems, and methods of use. 
     2. Description of Related Art 
     A number of user-wearable video display devices and systems have been developed and/or are in use in the art. 
     The following references may disclose examples of user-wearable video display devices, and may facilitate a more complete understanding of the various embodiments of the present invention and uses for the various embodiments of the present invention: (1) U.S. patent application Ser. No. 09/225,574, filed Jan. 5, 1999, and published as Pub. No. US 2003/0044757; (2) U.S. Pat. No. 7,249,846, filed May 3, 2006; (3) U.S. Pat. No. 7,217,164, filed Jun. 1, 2006; (4) U.S. Pat. No. 7,185,983, filed Apr. 13, 2004; (5) U.S. Pat. No. 6,981,876, filed Jun. 7, 2004; (6) U.S. Pat. No. 6,881,067, filed Jun. 11, 2002; (7) U.S. Pat. No. 6,045,224, filed Apr. 29, 1997; (8) U.S. Pat. No. 5,984,684, filed Dec. 2, 1996; (9) U.S. Pat. No. 5,924,868, filed Sep. 18, 1996; (10) U.S. Pat. No. 5,823,786, filed Aug. 15, 1997; and (11) U.S. Pat. No. 5,249,967, filed Jul. 12, 1991. The foregoing references numbered (1) through (11) are incorporated by reference in their entireties. 
     SUMMARY OF THE INVENTION 
     The present disclosure includes various embodiments of user-wearable video displays, systems, and methods. 
     Some embodiments of the present user-wearable video display devices comprise: a lateral member; a frame pivotally coupled to the lateral member; and a video screen (e.g., two video screens) coupled to the frame and capable of displaying video images; where the device is configured to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face, and the lateral member extends across a portion of the user&#39;s face. 
     In some embodiments, the device is further configured to be wearable by a user such that, if the device is worn by a user, the lateral member contacts a portion of the user&#39;s face. In some embodiments, the lateral member comprises a non-rigid material. In some embodiments, the non-rigid material is compressible. In some embodiments, the non-rigid material is resilient. In some embodiments, the device is configured such that the frame is capable of pivoting relative to the lateral member about a lateral horizontal axis extending through the lateral member. 
     In some embodiments, the device further comprises: two arms coupled to the lateral member such that the frame is capable of pivoting relative to the lateral member and both arms about a lateral horizontal axis extending through at least one of the lateral member and both arms; where the device is further configured to be wearable by a user such that, if the device is worn by a user, each of the two arms extends over a different one of the user&#39;s ears. In some embodiments, the two arms are integral to the lateral member. 
     In some embodiments, the device further comprises: a support member coupled to the lateral member, the support member having a bridge end; where device is further configured to be wearable by a user such that, if the device is worn by a user, the bridge end of the support member rests on the user&#39;s nose. In some embodiments, the support member is removably coupled to the lateral member. In some embodiments, the support member is disposed at about the middle of the lateral member. In some embodiments, the support member is coupled to the lateral member such that the position of the bridge end relative to the lateral member is adjustable. 
     In some embodiments, the device the device is further configured to be wearable by a user such that, if the device is worn by a user, at least a portion of the lateral member extends above at least a portion of a users eyes. In some embodiments, the device is further configured to be wearable by a user such that, if the device is worn by a user, the support member extends downward from the lateral member such the bridge end is disposed below at least a portion of the lateral member. In some embodiments, the support member is integral to the lateral member. 
     In some embodiments, the frame is pivotally coupled to the lateral member such that at least one characteristic of the pivotal relationship between the frame and lateral member is adjustable. In some embodiments, the frame is pivotally coupled to the lateral member by tension screws such that the force required to pivot the frame relative to the lateral member can be adjusted by rotating one or more of the tension screws. 
     Some embodiments of the present user-wearable video display devices comprise: a lateral member; two arms coupled to the lateral member; a frame pivotally coupled to the lateral member; and a video screen coupled to the frame and capable of displaying video images; where the device is configured to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face and each of the two arms extends over a different one of the user&#39;s ears. 
     Some embodiments of the present user-wearable video display devices comprise: a lateral member; a user-attachment band structure coupled to the lateral member; a frame pivotally coupled to the lateral member; and a video screen coupled to the frame and capable of displaying video images; where the device is configured to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face, and the user-attachment band structure wraps around a portion of the user&#39;s head. 
     In some embodiments, the user-attachment band structure is coupled to the lateral member such that the lateral horizontal axis also extends through a portion of the user-attachment band structure, and the frame is also capable of pivoting relative to the band structure. In some embodiments, the user-attachment band structure comprises: first and second band clips; and an elongated band coupled to and extending between the first and second band clips; where one of the two arms is coupled to a left side of the lateral member, the other of the two arms is coupled to a right side of the lateral member, the first band clip is configured to be capable of being coupled to the left arm, and the second band clip is configured to be capable of being coupled to the right arm. In some embodiments, the first and second band clips are removably coupled to the left and right arms, respectively. In some embodiments, the first and second band clips are coupled to the left and right arms, respectively, in non-pivoting relation. In some embodiments, the elongated band is elastic. 
     Some embodiments of the device further comprise two arms coupled to the lateral member such that the frame is capable of pivoting relative to the lateral member and both arms about a lateral horizontal axis extending through at least one of the lateral member and both arms; where the device is further configured to be wearable by a user such that, if the device is worn by a user, each of the two arms extends over a different one of the user&#39;s ears. Some embodiments further comprise: a support member coupled to the lateral member, the support member having a bridge end; where device is further configured to be wearable by a user such that, if the device is worn by a user, the bridge end of the support member rests on the user&#39;s nose. In some embodiments, the support member is coupled to the lateral member such that the position of the bridge end relative to the lateral member is adjustable. 
     Some embodiments of the present user-wearable video display devices comprise: a lateral member; a frame pivotally coupled to the lateral member; and a hat bill-attachment structure coupled to the frame; a video screen coupled to the frame and capable of displaying video images; where the device is configured to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face, and the lateral member extends across a portion of the user&#39;s face. In some embodiments, the video screen coupled to the frame and capable of displaying video images comprises two video screens coupled to the frame, each of which is capable of displaying video images. In some embodiments, the video screen is coupled to the frame through a housing member that is pivotally coupled to the frame and that can pivot relative to the frame. In some embodiments, the device is further configured to be wearable by a user such that, if the device is worn by a user, the lateral member contacts a portion of the user&#39;s face. In some embodiments, the lateral member comprises a non-rigid material. In some embodiments, the non-rigid material is compressible. In some embodiments, the non-rigid material is resilient. In some embodiments, the device is configured such that the frame is capable of pivoting relative to the lateral member about a lateral horizontal axis extending through the lateral member. 
     In some embodiments, the device further comprises: a user-attachment band structure coupled to the lateral member. In some embodiments, the user-attachment band structure is coupled to the lateral member such that the lateral horizontal axis also extends through a portion of the user-attachment band structure, and the frame is also capable of pivoting relative to the band structure. In some embodiments, the user-attachment band structure comprises: first and second band clips; and an elongated band coupled to and extending between the first and second band clips; where the first band clip is configured to be capable of being coupled to the left side of the lateral member, and the second band clip is configured to be capable of being coupled to the right side of the lateral member. In some embodiments, the first and second band clips are removably coupled to the left and right sides of the lateral member, respectively. In some embodiments, the first and second band clips are coupled to the left and right sides of the lateral member, respectively, in non-pivoting relation. In some embodiments, the elongated band is elastic. 
     In some embodiments, the hat bill-attachment structure includes an elastic band. In some embodiments, the hat bill-attachment structure comprises an adjustable lateral portion configured to be coupled to the bill of a hat. In some embodiments, the hat bill-attachment structure is oriented in a first plane, the user-attachment band structure is oriented in a second plane, and the first and second planes are oriented at an angle of between 5 and 45 degrees to each other. In other embodiments, the first and second planes are oriented at an angle of between 10 and 30 degrees to each other, between 15 and 25 degrees to each other, or at any other degree between 0 and 90 degrees. 
     In some embodiments, the display device further comprises: a support member coupled to the lateral member, the support member having a bridge end; where the device is further configured to be wearable by a user such that, if the device is worn by a user, the bridge end of the support member rests on the user&#39;s nose. In some embodiments, the support member is removably coupled to the lateral member. In some embodiments, the support member is disposed at about the middle of the lateral member. In some embodiments, the support member is coupled to the lateral member such that the position of the bridge end relative to the lateral member is adjustable. In some embodiments, the device is further configured to be wearable by a user such that, if the device is worn by a user, at least a portion of the lateral member extends above at least a portion of a users eyes. In some embodiments, the device is further configured to be wearable by a user such that, if the device is worn by a user, the support member extends downward from the lateral member such the bridge end is disposed below at least a portion of the lateral member. In some embodiments, the support member is integral to the lateral member. 
     In some embodiments, the frame is pivotally coupled to the lateral member such that at least one characteristic of the pivotal relationship between the frame and lateral member is adjustable. In some embodiments, the frame is pivotally coupled to the lateral member by tension screws such that the force required to pivot the frame relative to the lateral member can be adjusted by rotating one or more of the tension screws. 
     Some embodiments of the present kits comprise a user-wearable video display device where the frame is pivotally coupled to the lateral member such that at least one characteristic of the pivotal relationship between the frame and lateral member is adjustable; and a tool configured to adjust the at least one characteristic of the pivotal relationship between the frame and lateral member is adjustable. In some embodiments, the frame is pivotally coupled to the lateral member by tension screws such that the force required to pivot the frame relative to the lateral member can be adjusted by rotating one or more of the tension screws. In some embodiments, the tool comprises a screwdriver. 
     Some embodiments of the present kits comprise a user-wearable video display device and a case configured enclose the user-wearable video display device. In some embodiments, the arms of the device are non-collapsible relative to the lateral member. 
     Some embodiments of the present systems comprise: a user-wearable video display device; an emitter configured to be capable of wirelessly transmitting video data including video images; and a receiver configured to be capable, if video data is wirelessly transmitted from the emitter, of receiving wirelessly the video data from the emitter and communicating the video data to the user-wearable video display device. Some embodiments further comprising a cable connecting the receiver and the user-wearable video display device such that the receiver can communicate the video data to the user-wearable video display device via the cable. In some embodiments, the emitter is further configured to be capable of receiving video data from a video source. In some embodiments, the video source is a video camera. In some embodiments, the video source is a personal media device. 
     In some embodiments, the receiver comprises a cable having a connector, the user-wearable video display device comprises a cable having a connector, and the connector of the receiver is configured to be coupled to the connector of the user-wearable video display device such that video data can be communicated from the receiver to the to the user-wearable video display device via the cable of the receiver and the cable of the user-wearable video display device. In some embodiments, the receiver comprises a cable retractor having an actuator, and the cable retractor is configured to retract the cable responsive to the actuator being actuated by a user. In some embodiments, the receiver is coupled to the user-wearable video display device. 
     In any of these embodiments, the video screen may comprise two video screens, each of which is coupled to the frame and capable of displaying video images. In any of these embodiments, the video screen can be coupled to the frame through a housing member that is pivotally coupled to the frame and that can pivot relative to the frame. 
     Any embodiment of any of the present methods can consist of or consist essentially of—rather than comprise/include/contain/have—any of the described steps, elements, and/or features. Thus, in any of the claims, the term “consisting of” or “consisting essentially of” can be substituted for any of the open-ended linking verbs recited above, in order to change the scope of a given claim from what it would otherwise be using the open-ended linking verb. 
     Details associated with the embodiments described above and others are presented below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The following drawings illustrate by way of example and not limitation. For the sake of brevity and clarity, every feature of a given structure is not always labeled in every figure in which that structure appears. Identical reference numbers do not necessarily indicate an identical structure. Rather, the same reference number may be used to indicate a similar feature or a feature with similar functionality, as may non-identical reference numbers.  FIGS. 2A ,  2 B,  3 A,  3 B,  3 C,  3 D,  3 E,  4 A,  4 B,  5 A,  5 B,  6 A,  6 B,  7 A,  7 B,  8 A, and  8 B are drawn to scale, meaning the sizes of the depicted elements are accurate relative to each other for at least one set of embodiments of the present devices and systems. 
         FIG. 1  depicts one of the present systems that includes a user-wearable video display device. 
         FIGS. 2A-2B  depict perspective and side views, respectively, of one embodiment of the present user-wearable video display devices in a non-rotated position. 
         FIGS. 3A-3E  depict various enlarged and exploded views of portions of the user-wearable video display device of  FIGS. 2A-2B . 
         FIGS. 4A-4B  depict partially disassembled left and right side views of the user-wearable video display device of  FIGS. 2A-2B . 
         FIGS. 5A-5B  depict front and side views, respectively, of the user-wearable video display device of  FIGS. 2A-2B  in a pivoted configuration. 
         FIGS. 6A-6B  depict front and side views, respectively, of the user-wearable video display device of  FIGS. 2A-2B  in another pivoted configuration. 
         FIGS. 7A-7B  depict side and front views, respectively, of an emitter suitable for use with the system of  FIG. 1 . 
         FIGS. 8A-8B  depict side and front views, respectively, of a receiver suitable for use with the system of  FIG. 1 . 
         FIG. 9A-9B  depict various partially disassembled views of the receiver of  FIGS. 8A-8B . 
         FIG. 10  depicts a schematic of a transmitter module suitable for use with one of the present emitters. 
         FIG. 11  depicts a schematic of a receiver module suitable for use with one of the present receivers. 
         FIGS. 12A-12B  depict perspective views of another embodiment of a user-wearable video-display device suitable for use with the system of  FIG. 1  and worn by a user. 
         FIG. 13  depicts an upper perspective view of the embodiment of  FIGS. 12A-12B  worn by a user. 
         FIGS. 14A-14B  depict side views of the embodiment of  FIGS. 12A-12B  worn by a user. 
         FIG. 15  depicts a perspective view of the embodiment of  FIGS. 12A-12B . 
         FIG. 16  depicts an exploded view of the embodiment of  FIGS. 12A-12B . 
         FIGS. 17A-17B  depicts partially disassembled side views of the embodiment of  FIGS. 12A-12B . 
         FIG. 18  depicts a perspective view of a lateral portion of a hat bill-attachment structure of some embodiments of the present user-wearable video-display devices. 
         FIG. 19  depicts various views of an adjustment assembly for use with the user-wearable video display devices of the present disclosure. 
     
    
    
     DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     The term “coupled” is defined as connected, although not necessarily directly, and not necessarily mechanically; two items that are “coupled” may be integral with each other. Items may also be “non-integrally coupled.” The terms “a” and “an” are defined as one or more unless this disclosure explicitly requires otherwise. The terms “substantially,” “approximately,” and “about” are defined as largely but not necessarily wholly what is specified, as understood by a person of ordinary skill in the art. 
     The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “include” (and any form of include, such as “includes” and “including”) and “contain” (and any form of contain, such as “contains” and “containing”) are open-ended linking verbs. As a result, a device, system or method that “comprises,” “has,” “includes” or “contains” one or more elements or steps possesses those one or more elements or steps, but is not limited to possessing only those elements or steps. For example, a user-wearable video display device that comprises a video screen and a frame, includes the specified elements but is not limited to having only those elements. For example, such a device could also include a second video screen, a pair of arms, and/or a user-attachment band structure. 
     Further, a device or structure that is configured in a certain way is configured in at least that way, but it can also be configured in ways other than those specifically described. 
     Referring now to the drawings, and more particularly to  FIG. 1 , shown there and designated by the reference numeral  5  is one of the present systems that comprises a user-wearable video display device  10 . The user-wearable video display device  10  may be interchangeably referred to here as device  10 , video device  10 , or video display device  10 . In the embodiment shown, system  5  also comprises: an emitter  14 ; a receiver  18 ; a video source  20 ; a source cable  22 ; and a display cable  24 . Emitter  14  is configured to be capable of wirelessly transmitting video data including, but not necessarily limited to, video images. For example, in some embodiments, the emitter is configured to be capable of wirelessly transmitting video data including only video images; and in other embodiments, the emitter is configured to be capable of wirelessly transmitting video data including video images and audio sounds. Receiver  18  is configured to be capable, if video data is wirelessly transmitted from the emitter, of receiving wirelessly the video data (including audio sounds) from the emitter and communicating the video data to display  10  (e.g., via display cable  24 ). 
     Video source  20  is configured to be capable of storing or generating video data in a format that the video data can be communicated to, or accessed by, the emitter; the video source, therefore, is also configured to be capable of transmitting video data. For example, the video source can be a personal media player having memory for storing video data, e.g., an Apple iPod®, or a Microsoft ZUNE. By way of other examples, the video source can a digital video camera configured to capture (e.g., live video capture (but not store on a medium such as a tape)) and/or record video data; or a portable hard drive. In the embodiment shown, the video source is coupled to the emitter by way of source cable  22 , and the source cable is a patch cable having 2.5 mm (ear phone) plugs (for connecting to the video source and emitter). In other embodiments, the source cable can be any suitable cable for communicating video data, and can include one or more wires or discrete communication paths. For example, the source cable can include any one or more of: an RCA audio or video cable, an HDMI cable, a USB cable, a fiber optic cable, or the like. In some embodiments, the video source and the emitter can be a single unit, such as, for example, a cellular phone configured to be capable of: storing or generating video data, and transmitting wirelessly video data to the receiver, e.g., via Bluetooth, wifi, infrared link, or the like. Display cable  24  can similarly be any suitable cable configured to be capable of communicating video data (including audio sounds) from the receiver  18  to display  10 . In embodiments in which a display cable  24  is used, the display cable may include a power source for the device  10  if the same is not provided in the receiver; the display cable may include an on/off switch that, when toggled to “on,” allows video data (including images and sound) to reach the device; and may include a volume controller for the sound data that is transmitted to the device. The functions the display cable performs can integrated into receiver  18  in other embodiments. 
     Referring now to  FIGS. 2A-2B ,  5 A- 5 B, and  6 A- 6 B, various views are shown of a user-wearable video display device  10  that is suitable for use with system  5 . As will be appreciated when viewing the figures, the display can be worn similarly to the way a pair of glasses is worn. Terms such as “vertical” and “horizontal” are used to describe various features of the display when worn in a non-rotated and non-extended position (as will be described in more detail below) by a human user who is sitting or standing such that the user&#39;s head is substantially upright. These terms do not limit the orientation of the features, as the orientation of such “vertical” and “horizontal” features will necessarily vary when the display is not worn by a user, or when the display is worn by a user and the user is in other positions. 
     In the embodiment shown, the display device comprises: a lateral member  26 , video screen  34  (which may, for example, be a stereoscopic video display), a frame  38 , and a support member  42 . The embodiment of device shown is configured to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face, and the lateral member extends across a portion of the user&#39;s face and/or contacts a portion of the user&#39;s face (e.g., the user&#39;s forehead). In the embodiment shown, the device is further configured to be wearable by a user such that, if worn by a user, at least a portion of the lateral member extends above at least a portion of a users eyes. As shown, lateral member  26  comprises a first end  28 , and a second end  30 . The lateral member contours upwards at its lateral middle (or lateral center), as shown, such that lateral member  26  does not obstruct at least a portion of a user&#39;s field of view if the device is worn by a user. Lateral member  26  can comprise any suitable material, such as, for example, plastic, composite, polymer, aluminum, or the like. In some embodiments, lateral member comprises a non-rigid material  32  on an inner surface (a surface that is adjacent to a user&#39;s face (e.g., forehead) if the device is worn by a user). Non-rigid material  32  can be compressible and/or resilient, and can comprise any suitable material, such as, for example, foam, rubber, fabric, or the like. 
     Video screen  34  is configured to be capable of displaying video images. In the embodiment shown, video screen  34  comprises two video screens. In other embodiments, the video screen can be only a single video screen, such as, for example, having two windows or in any other suitable configuration, including one that includes a magnifying lens (or lenses) in front of the screen. The video screen can be any structure or assembly capable of displaying video images, such as, for example, a liquid crystal display (LCD), or the like. It may also be configured to display video images in stereoscopic fashion. The video screen may include or be part of a video engine, or a video engine (not shown) may be separately included in the device. For example, suitable video engines are available from Ester Electronic &amp; Technology Co., Ltd., Shenzken, Guangdong, China. As shown, frame  38  is coupled to the video screen such that the frame supports, directly or indirectly, the video screen. 
     Support member  42  is coupled to the lateral member, and support member  42  has a bridge end  46  configured to be capable of resting on the bridge of a user&#39;s nose if the display is worn by a user. In this way, the device is configured to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face and the bridge end of the support member rests on the user&#39;s nose. More specifically, as shown, the support member is disposed at about the middle of the lateral member such that the support member extends downward from the lateral member such that bridge end  46  is disposed below at least a portion of the lateral member (e.g., the middle portion of the lateral member from which the support member extends from). In the embodiment shown, the support member is removably coupled to lateral member (e.g., is configured to be removable, and can be removed, from the lateral member without damaging the lateral member). In other embodiments, the support member is integral to the lateral member (e.g., is not removable, and/or is of unitary construction). 
     Frame  38  is pivotally coupled to lateral member  42  such that frame  38  is capable of pivoting relative to lateral member  26 . More specifically, in the embodiment shown, the frame is pivotally coupled to the lateral member such that at least one characteristic of the pivotal relationship between the frame and lateral member is adjustable. Characteristics of such pivotal relationship that can be adjustable include, for example, one or more of resistant to pivotal motion (the force required to pivot the frame relative to the lateral member), range of pivotal motion, and the like. For example, the frame can be coupled to the lateral member by tension screws  50  such that the force required to pivot the frame relative to the lateral member can be adjusted by rotating (e.g., by way of a tool  52  such as, for example, a screwdriver or the like) one or more of tension screws  50 . In some embodiments, a kit comprises system  5  (or at least device  10 ) and tool  52 . In some embodiments, a kit comprises system  5  (or at least device  10 ) and a case (not shown, but individually known in the art in other configurations) configured to enclose the user-wearable video display device. In other embodiments, the frame can be pivotally coupled to the lateral member by any suitable means, such as, for example, rivets, pins and tabs/slots, or the like. As a result of configuring device  10  in this manner, the device (and, more specifically frame  38 ) has a non-pivoted position (e.g.,  FIG. 2B ) and any one of multiple pivoted positions (e.g.,  FIGS. 5A-6B ) that allow a wearer of the device, who desires to use it as a training aide to view real-time video images of a sports movement (or the like) the wearer performs, to adjust the pivoted or non-pivoted position (or angle) of the frame (and of the video screen  34 ), relative to the lateral member, to best suit the sports movement the wearer wishes to perform. 
     In the embodiment shown, display  10  also comprises two arms  54  coupled to lateral member  26  such that the frame is also capable of pivoting or rotating (or configured to pivot or rotate) relative to both arms about a lateral horizontal axis  58  extending through both arms (and/or through the lateral member, such as, for example, through both ends  28  and  30  of the lateral member). More specifically, in the embodiment shown, the arms are integral to the lateral member (are of unitary or one-piece construction). In other embodiments, the arms can be separately formed and can be coupled (e.g., non-pivotally) to the lateral member by any suitable means, such as, for example, by one or more of screws, rivets, tabs and slots, welding (e.g., plastic welding), adhesive, and the like. In embodiments, such as the one shown, in which the arms are fixed (non-collapsible) relative to the lateral member, the device can be described as having a non-collapsible configuration and/or as having two arms that are non-collapsible relative to the lateral member. 
     In the embodiment shown, device  10  comprises a user-attachment band structure  62  coupled to at least one of the lateral member and the arms (and/or both, directly or indirectly). User-attachment band structure  62  may be interchangeably referred to as band structure  62 . In some embodiments, device  10  is configured to be wearable by a user such that, if the device is worn by a user, each of the two arms extends over a different one of the user&#39;s ears and the user-attachment band structure wraps around a portion of the user&#39;s head. 
     More specifically, in the embodiment shown, band structure  62  comprises first and second band clips  66  and an elongated band  70  coupled to and extending between first and second band clips  66 . As described above, one of the two arms is coupled to a left side of the lateral member, and the other of the two arms is coupled to a right side of the lateral member, the first band clip is configured to be capable of being coupled to the left arm, and the second band clip is configured to be capable of being coupled to the right arm. As best shown in  FIG. 3A , a forward portion  74  of each arm (and/or each end of the lateral portion) can be provided with a tab  78 , and each band clip  66  can be provided with a shape corresponding to forward portion  74  and tab  78  such that the band clip can be snapped or clipped (e.g., removably) over the forward portion  74  and/or tab  78 . In this way, each band clip is capable of being coupled to a respective arm in a substantially fixed (e.g., non-pivoting) relationship to that arm, such that the frame can be pivoted or rotated relative to both arms and the band structure. In some embodiments, band  70  and/or band structure  62  can comprise a ratcheting adjustment mechanism, such as may be used on certain hardhats, helmets, and the like. 
     Each clip can also comprise a slot  82  configured to receive a portion of the band  70 . In some embodiments, the band is elastic. The band can comprise any suitable material, such as, for example, a fabric strap, an elastic strap, a leather strap, a plastic strap, or the like. In some embodiments, device  10  also comprises an adjuster  86  to permit a user to adjust the length of the band extending between the band clips. 
     In the embodiment shown, the band structure is coupled to the lateral member such that the lateral horizontal axis also extends through a portion of the user-attachment band structure and the frame is also capable of pivoting relative to the band structure as well as the lateral member and both arms. In the embodiment shown, the band structure is configured such that support member  42  can be removed (e.g., during an active sport or the like) and the band structure and arms can cooperate to hold the device in position if worn by a user such that the band structure wraps around the user&#39;s head and each of the arms extends over a different one of the user&#39;s ears. 
     Device  10  (and more specifically frame  38 ) can be described as having at least (1) a non-rotated position (or configuration or orientation), (2) an upwardly rotated position (or configuration or orientation); and (3) a downwardly rotated position (or configuration or orientation). In the non-rotated position, e.g.,  FIGS. 2A-2B , the arms are substantially aligned with the frame such that, if the device is worn by a user, the video screen is in front of the user&#39;s eyes and the bridge end of the support member (if not removed, i.e., coupled to the lateral member) rests on the user&#39;s nose (e.g., the bridge of the user&#39;s nose). In an upwardly rotated position, e.g.,  FIGS. 5A-5B , the frame (and video screen) is rotated upward relative to the lateral member (and the arms), such that if worn by a user with the bridge end of the support member (if not removed, i.e., coupled to the lateral member) resting on the user&#39;s nose (e.g., the bridge of the user&#39;s nose), the frame (and video screen) is raised relative to the user&#39;s eyes and oriented such that the user can view the video screen by looking upward; in addition, at least a portion of the user&#39;s direct field of vision is unobstructed by the frame and video screen. In a downwardly rotated position, e.g.,  FIGS. 6A-6B , the frame (and video screen) is rotated downward relative to the lateral member (and the arms), such that if worn by a user with the bridge end of the support member (if not removed, i.e., coupled to the lateral member) resting on the user&#39;s nose (e.g., the bridge of the user&#39;s nose), the frame (and video screen) is lowered relative to the user&#39;s eyes and oriented such that the user can view the video screen by looking downward; in addition, at least a portion of the user&#39;s direct field of vision is unobstructed by the frame and video screen. The device is configured to be capable of many different positions in which the frame has been rotated relative to the lateral member, and such positions can be selected for or matched to a given activity that is being performed by a wearer. For example, when a wearer is using the device to improve her tennis serve, she will be viewing video images of herself in real time as she is practicing her serve. Therefore, she may wish to extend the frame so that she can see the ball at the top of her serve and she will have the ability to correspondingly rotate the frame to enable her to view the video screen. In addition, a user may also be able to practice, e.g., a sports movement when the device has not been rotated. For example, in golf, it may be possible to practice a golf swing while viewing real-time video images of that swing when the frame is in a non-rotated position because the wearer will be looking downward. It should be understood that in the non-rotated position, the user&#39;s direct field of vision may not necessarily be completely taken up by the video screen and frame due to their size; and in a rotated and extended position, the user&#39;s direct field of vision may not necessarily be completely unobstructed. 
     Referring now to  FIGS. 3A-3E  and  4 A- 4 B, various partially disassembled and enlarged views are shown of various portions of the device  10  to illustrate various details of this embodiment of device  10 . Device  10  comprises an input cable  100  entering the device through an arm  54 . In put cable includes a connector (plug)  104  on an outer end of the input cable. Connector (plug)  104  is configured to removably connect to a corresponding connector (plug) (not shown) on device cable  24 . For example, connector (plug)  104  can be a male connector (plug) to correspond to a female connector (plug) on device cable  24 , or vice versa, and the two can be configured to snap fit together such that one or other includes structure that must be depressed and/or squeezed in order to disconnect them. In some embodiments, input cable  100  is integral to device cable  24  such that connector (plug)  104  can be omitted. An inner end  108  of input cable  100  is coupled to video display  34  (e.g., by way of a video engine that may include a processor, graphics card, and/or the like). 
     Device  10  further comprises audio cables  112  coupled to the input cable (e.g., by way of a video engine) such that the audio component of any input (e.g., video images or the like) can be routed to earphone jacks  116  in the arms, e.g., at a position near the user&#39;s ears when the device is worn, such that earbud or other earphones (not shown) can be plugged into the earphone jacks to deliver any audio sounds included in the video data to the user&#39;s ears. In other embodiments, the earbud or other earphones can be hardwired to the device such that the earphone jacks can be omitted, the device can comprise a single earphone jack, the earphones and jacks can be omitted entirely, and/or the device can instead comprise speakers. 
     Frame  38  comprises a central housing member  118 , a video screen support  120 , and one or more lateral housing members  124 . Video screen support  120  is configured to support video screens  34  and a video engine  128 . Video engine  128  can comprise any suitable hardware for receiving and/or routing video data from the input cable to the video screens, such as, for example, a processor, memory, a graphics card, and/or the like. Video engine  128  can also be configured to receive, extract, and/or route an audio component of the video data or other input from the input cable to the earphone jacks  116  via audio cables  112 . Central housing member  118  and/or lateral housing members  124  can be coupled to the frame and/or to one another by any suitable means, such as, for example, screws  132 , pins  136 , adhesive, clips, rivets, and/or the like. As with the pivotal coupling between frame  38  and lateral member  26 , pins  136  permit central housing member  118  (and screen or screens  34 ) to pivot relative to frame  38  such that when frame  38  is rotated to a position shown in either of  FIGS. 5A-6B , central housing member  118  can be pivoted relative to frame  38 , such as, for example, to improve the line-of-sight from a user&#39;s eyes to the screens (e.g., visibility of the screen or screens to the user). In some embodiments, the video engine may include the video screens, or be characterized as including the video screens. 
     In the embodiment shown, each arm  54  comprises a central arm member  142 , an outer arm housing  144 , and an inner arm housing  146 . Central arm members  142  are integral to lateral member  26 . Each outer arm housing  144  and corresponding inner arm housing  146  are coupled to the corresponding central arm member  142  and/or to the lateral member by way of screws  148  or the like. Each outer arm housing  144  (and/or inner arm housing  146 ) can comprise one or more tabs or knobs  152  or the like to organize or configure input cable  100  and/or audio cables  112  between outer arm housings  144  and/or corresponding central arm members  142  and/or inner arm housings  146 , as shown. In other embodiments, outer arm housings  144  and/or inner arm housings  146  can be omitted or integral to central arm members  142  and/or lateral member  26  such that arms  54  are hollow and/or otherwise provide a path for input cable  100  and/or audio cables  112 ; or, input cable  100  and/or audio cables  112  can be external to the arms. 
     In the embodiment shown, support member  42  is removably coupled to lateral member  26  by way of a tab  152  on support member  42  and a corresponding slot  156  in lateral member  26 . Further, tab  152  is provided with a clip or protrusion  160  to resist removal of tab  152  from slot  156 . However, clip  160  is flexible such that tab  152  can be removed from slot  156  by applying a sufficient force and/or depressing clip  160 . 
     In the embodiment shown, ends  28  and  30  of lateral member  26  include circular cylindrical receiving portions  164  that are configured to at least partially receive bushings or bearings  168 . Bushings  168  are configured to permit tension screws  50  to extend through bushings  168  into lateral member  26  (and/or central arm members  142 ) and to improve rotation of frame  38  relative to lateral member  26  and/or arms  54 . In some embodiments, bushings  168  are configured instead to include interior threads corresponding to the threads of tension screws  50  such that bushings  168  can be glued and/or otherwise secured to lateral member  26  and/or arms  54  (e.g., through a press-fit). 
     In the embodiment shown, the device does not comprise its own power source (e.g., battery). Instead, the device is powered by the receiver, via the display cable. In other embodiments, the device can comprise a power source (not shown), such as, for example, one or more batteries. 
     Referring now to  FIGS. 7A-7B , side and front views, respectively are shown of an emitter  14  that is suitable for use with the system  5 . Emitter  14  is configured to be capable of wirelessly transmitting video data including, but not necessarily limited to, video images. For example, in some embodiments, the emitter is configured to be capable of wirelessly transmitting video data including only video images; and in other embodiments, the emitter is configured to be capable of wirelessly transmitting video data including video images and/or audio sounds (e.g., an audio component). The emitter comprises a housing  200 , a belt clip  204 , one or more input jacks  208 , and a transmitter module (see, e.g.,  FIG. 10 ). The input jacks are configured to permit a video source to be connected to the emitter such that the emitter can access or receive video data from the video source and transmit the video data wirelessly to the receiver. The emitter can also comprise a charging jack (not shown, but individually known in the art) and one or more output jacks (not shown, but individually known in the art). The charging jack is configured to permit a power source, e.g., a wall plug (not shown, but individually known in the art) or the like, to be connected to the emitter and charge an internal battery (in embodiments where the emitter is provided with a rechargeable battery). The emitter can also comprise a charging indicator light (not shown, but individually known in the art) configured, if a wall plug is connected to the emitter and a wall outlet, to emit red light when the battery is charging, and to emit green light when the battery is fully charged. The emitter can also comprise an internal charging circuit or the like (not shown, but individually known in the art) to control the rate of charge. The one or more output jacks can be configured to output video data to a local display, or to output audio sounds included in the video data to a local speaker, earphones, or the like. 
       FIG. 10  depicts a schematic of one example of a suitable transmitter module that is available from Airwave Technologies, Inc., Hsinchu, Taiwan, and that has a product designation of AWM651 TX 2.4 GHz Wideband FM Transmitter Module. 
     The emitter can also be configured to transmit wirelessly video data at a two or more frequencies or channels, e.g., 2414 MHz, 2432 MHz, 2450 MHz, and 2468 MHz. In such embodiments, the emitter can comprise a channel switch (not shown, but individually known in the art) and two or more channel lights (not shown, but individually known in the art). The channel switch is configured to permit a user to switch between the two or more channels, and the two or more channel lights are each configured to emit light when a corresponding channel is selected. In some embodiments, the emitter can also comprise an on/off switch; or can be configured to automatically turn on if a video source is connected, and automatically turn off if a video source is disconnected. 
     Referring now to  FIGS. 8A-8B  and  9 A- 9 B, various views are shown of a receiver  18  that is suitable for use with the system  5 . Receiver  18  is configured to be capable, if video data is wirelessly transmitted from the emitter, of receiving wirelessly the video data from the emitter and communicating the video data to display  10 . The receiver comprises a housing  300 , a belt clip  304 , display cable  24 , a connector (plug)  308 , and a receiver module  312 . Connector  304  is configured to be coupled to the connector of the user-wearable video display device such that video data can be communicated from the receiver to the to the user-wearable video display device via display cable  24  and input cable  100  such that the receiver can communicate video data to the device if such video data is received wirelessly from an emitter. 
       FIG. 11  depicts a schematic of one example of a suitable receiver module that may be used for module  312  and that is available from Airwave Technologies, Inc., Hsinchu, Taiwan, and that has a product designation of AWM650RX 2.4 GHz Wideband FM Receiver Module. 
     In the embodiment shown, the receiver comprises a cable retractor  316  having an actuator  320  and configured to retract display cable  24  responsive to the actuator being actuated by a user. More specifically, cable retractor  316  comprises a spool  324  that is spring-loaded such that as the display cable is pulled out of the receiver (and unwound from the spool), the spring is increasingly coiled such that actuating the actuator releases the spring and permits the spring to re-coil the display cable around the spool. In other embodiments, the cable retractor can be omitted. The receiver can also comprise a clip  326  configured to removable receive connector  308  (e.g., when display cable  24  is retracted). 
     In the embodiment shown, the receiver comprises a rechargeable battery  328 . The receiver can also comprise a charging jack. The charging jack is configured to permit a power source, e.g., a wall plug or the like, to be connected to the receiver and charge an internal battery. The receiver can also comprise a charging indicator light configured, if a wall plug is connected to the receiver and a wall outlet, to emit red light when the battery is charging, and to emit green light when the battery is fully charged. The receiver can also comprise an internal charging circuit or the like to control the rate of charge. In other embodiments, the battery can be a non-rechargeable battery, or can be omitted in favor of an external power source. 
     Receiver module  312  comprises a printed circuit board  332  having a wireless antenna  336 , an on/off switch  340 , a power indicator light  344 , and a volume control  348  for controlling the volume level of an audio component of video data transmitted to the device (if such an audio component is present in the video data). In some embodiments, the on/off switch can be omitted and/or the receiver can be configured to automatically turn on if a device is connected, and automatically turn off if a device is disconnected. In some embodiments, the antenna may be integrated into the electrical components coupled directly to the frame (e.g., the antenna may be part of a video engine). 
     The receiver can also be configured to receive wirelessly video data at a two or more frequencies or channels, e.g., 2414 MHz, 2432 MHz, 2450 MHz, and 2468 MHz, that correspond to at least one channel of an emitter. In such embodiments, the receiver can comprise a channel switch  352  and/or two or more channel lights. Channel switch  352  is configured to permit a user to switch between the two or more channels, and the two or more channel lights are each configured to emit light when a corresponding channel is selected. In this way, a plurality of emitters can be used with a single receiver. For example, a first video source (camera having a first view) can be connected to a first emitter that is set to a first channel; and a second video source (e.g., camera having a second view) can be connected to a second emitter that is set to a second channel; such that a user with a receiver connected to a user-wearable video display device can use the channel switch  328  on the receiver to switch between viewing the first view and the second view. These same principles can be applied to configure emitters and receivers that permit a user to switch between any number of views or video sources, such as, for example, two, three, four, or the like. 
     The various parts and elements of device  10 , emitter  14 , and receiver  18  can comprise any suitable materials. For example, the frame, arms, and arm bases of the device; and/or the housing and belt clip of the emitter and receiver, can comprise plastic, polymer, carbon fiber, or the like. Similarly, various parts or components can be formed or manufactured or formed by any suitable methods, such as, for example, injection molding, or the like. Although not described in detail, it will be understood by those of skill in the art that various wiring, circuitry, and the like may be required for device  10  to be capable of functioning as described. For example, the video engine of the device may include a video processor, graphics card, or the like. 
     Referring now to  FIGS. 12A-12B ,  13 ,  14 A- 14 B,  15 , and  16 , various views of another embodiment of a user-wearable video-display device  500  are shown.  FIGS. 12A and 12B  depict perspective views of device  500  worn by user  504 ;  FIG. 13  depicts an upper perspective view of device  500  worn by a user  504 ;  FIGS. 14A and 14B  depict side views of device  500  worn by a user  504 ;  FIG. 15  depicts a perspective view of device  500  alone; and  FIG. 16  depicts an exploded view of device  500  alone. Device  500  is similar in some respects to device  10 , and the differences are primarily described here. Device  500  is suitable for use with the system of  FIG. 1 . 
     In the embodiment shown, device  500  comprises: a lateral member  508 ; a frame  512  pivotally coupled to lateral member  508 ; a hat bill-attachment structure  512  coupled to frame  516 ; and a video screen  520  coupled to frame  516  and capable of displaying video images. In the embodiment shown, device  500  is configured to be wearable by a user  504  such that, if the device is worn by a user  504 , the video screen  520  is in front of the user&#39;s face, and lateral member  508  extends across a portion of the user&#39;s face, as shown. As described in more detail below, in the embodiment shown, hat bill-attachment structure  512  is configured to be removably (or permanently) coupled to the bill  524  of a hat  528  (e.g., to rest on the bill of a hat) such that device  500  can be worn by a user  504  with video screen  520  in front of the user&#39;s face. 
     Device  500  (e.g., lateral member  508 , frame  516 , and/or video screen  520 ) can be configured in any of the ways described above with reference to device  10 . For example, as described above for device  10 , device  500  is configured such that the frame is capable of pivoting relative to the lateral member about a lateral horizontal axis  532  extending through the lateral member. By way of another example, video screen  520  can comprise two video screens coupled to the frame, each of which is capable of displaying video images. By way of another example, although device  500  is shown without arms, and can be described as a user-wearable video-display device that has no arms, some embodiments of device  500  can comprise arms, configured, for example, in any of the ways described above with reference to device  10 . Similarly, embodiments of the present systems, kits, and methods can comprise various embodiments of device  500 . 
     In the embodiment shown, device  500  further comprises a user-attachment band structure  536  coupled to the lateral member. User-attachment band structure can also be configured in any of the ways described above with reference to device  10 . For example, in the embodiment shown, user-attachment band structure comprises first and second band clips  540 ; and an elongated band  544  coupled to and extending between first and second band clips  540 ; where the first band clip is configured to be capable of being coupled to the left side of the lateral member, and the second band clip is configured to be capable of being coupled to the right side of the lateral member. 
     In the embodiment shown, device  500  further comprises a support member  548  coupled to lateral member  508 , the support member having a bridge end  552 ; and device  500  is further configured to be wearable by a user  504  such that, if the device is worn by a user  504 , bridge end  552  of the support member rests on the user&#39;s nose. Support member  548  can be also be configured in any of the ways described above with reference to device  10 . For example, support member  548  can be removably coupled to the lateral member, or support member  548  can be integral to the lateral member. 
     As mentioned above, in the embodiment shown, hat bill-attachment structure  512  is configured to be removably (or permanently) coupled to the bill  524  of a hat  528  such that device  500  can be worn by a user  504  with video screen  520  in front of the user&#39;s face. More specifically, in the embodiment shown, hat bill-attachment structure  512  comprises: two hubs  556  coupled to lateral member  508  (e.g., by way of tension screws  580 , described below); and a lateral portion  558  extending between hubs  556 . In some embodiments, lateral portion  558  is configured to match the contour of the hat bill  524 . For example, in the embodiment shown, lateral portion  558  comprises an elastic band. In other embodiments, lateral portion  558  can comprise a substantially rigid material such as plastic, aluminum, carbon fiber, or the like. In some embodiments, the hat bill-attachment structure includes an elastic band. 
     In the embodiment shown, hat bill-attachment structure  512  is oriented in a first plane  560 , user-attachment band structure  536  is oriented in a second plane  562 , and the first and second planes  560  and  562 , respectively, are oriented at an angle  564  of between 5 and 45 degrees to each other. In other embodiments, the first and second planes are oriented at an angle  564  of between 10 and 30 degrees to each other, between 15 and 25 degrees to each other, or at any other degree between 0 and 90 degrees. 
     Referring now to  FIGS. 17A and 17B , partially disassembled side views are shown of device  500  alone (not worn by a user such as user  504 ). As described above for device  10 , device  500  comprises an input cable  568  entering the device through the lateral member and connected to a video engine  572 . Device  500  further comprises audio cables  576  coupled to the input cable (e.g., by way of a video engine) such that the audio component of any input (e.g., video images or the like) can be routed to earphone jacks  576  in a rearward portion of the lateral member, e.g., at a position near the user&#39;s ears when the device is worn, such that earbud or other earphones (not shown) can be plugged into the earphone jacks to deliver any audio sounds included in the video data to the user&#39;s ears. In other embodiments, the earbud or other earphones can be hardwired to the device such that the earphone jacks can be omitted, the device can comprise a single earphone jack, the earphones and jacks can be omitted entirely, and/or the device can instead comprise speakers. 
     As also described above with reference to device  10 , the embodiment of device  500  shown is configured such that the frame is pivotally coupled to the lateral member such that at least one characteristic of the pivotal relationship between the frame and lateral member is adjustable. More specifically, the frame is pivotally coupled to the lateral member by tension screws  580  such that the force required to pivot the frame relative to the lateral member can be adjusted by rotating one or more of tension screws  580 . 
       FIG. 18  depicts an enlarged, cross-sectional view of one embodiment of an adjustable lateral portion  558   a  suitable for use or inclusion in some embodiments of hat bill-attachment structure  512 . Lateral portion  558   a  comprises a first piece  584  configured to be coupled to one of hubs  556 , and a second piece  588  configured to be coupled to the other of hubs  556 . First piece  584  has a coupling end  590  including at least one protrusion  592  (though it may, as shown, include a plurality of protrusions  592 ). Second piece  588  has a coupling end  594  including an opening  596  and a plurality of indents  598  configured to correspond to protrusions  592 , as shown. In this embodiment, coupling end  590  is a “male” connector configured to be inserted into the “female” connector coupling end  594  (e.g., opening  596 ), as shown, such that the position of first piece  584  can be adjusted relative to second piece  588  to adjust the overall length of lateral portion  558   a . In some embodiments, lateral portion  558   a  can comprise a substantially rigid material such as plastic, aluminum, carbon fiber, or the like. 
     Referring now to  FIG. 19 , various views are shown of an adjustment assembly  600  for use with some embodiments of the present user-wearable video display devices. In particular, adjustment assembly  600  comprises a support member  42 ′ similar to support member  42  described above (e.g., support member  42 ′ has a bridge end  46 ′ configured to be capable of resting on the bridge of a user&#39;s nose when the display is worn by a user). Adjustment assembly  600  can be coupled to some embodiments of the present user-wearable display devices to configure the devices to be wearable by a user such that, if the device is worn by a user, the video screen is in front of the user&#39;s face and the bridge end of the support member rests on the user&#39;s nose. In the embodiment shown, adjustment assembly  600  can be coupled to the lateral member (e.g., 26) such that support member  42 ′ is adjustably coupled to the lateral member, and such that bridge end  46 ′ of the support member can be extended a distance  604  downward from the lateral member, where distance  604  is adjustable by at least 0.5 inches (a range of at least 0.5 inches). In some embodiments, the distance  50  is adjustable by at least, more than, equal to, less than, or any range between, any of: 0.1 inches, 0.2 inches, 0.3 inches, 0.4 inches, 0.5 inches, 0.6 inches, 0.7 inches, 0.8 inches, 0.9 inches, 1.0 inches, 1.1 inches, 1.2 inches, 1.3 inches, 1.4 inches, 1.5 inches, 1.6 inches, 1.7 inches, 1.8 inches, 1.9 inches, and 2.0 inches. 
     In the embodiment shown, adjustment assembly comprises an adjustment member  608  coupled to the frame and the support member. As shown, adjustment member  608  comprises a protrusion  612 . More specifically, in the depicted embodiment the adjustment member comprises a tab  616  having a first end  620  connected to the adjustment member, and a second end  624  capable of moving relative to the adjustment member, and protrusion  612  is disposed on second end  624  of the tab. Support member  42 ′ has an elongated portion  628  slidably coupled to the adjustment member  608  such that protrusion  612  is capable of contacting elongated portion  628  to resist movement of elongated portion  628  relative to adjustment member  608 . Elongated portion  628  can also have at least one indent  632  configured to be capable of receiving at least a portion of protrusion  612 . Elongated portion  628  can have a length of at least 0.5 inches, e.g., in embodiments in which distance  604  is adjustable by at least 0.5 inches. Similarly, elongated portion  628  can have a length of at least, more than, less than, or any range between, any of: 0.1 inches, 0.2 inches, 0.3 inches, 0.4 inches, 0.5 inches, 0.6 inches, 0.7 inches, 0.8 inches, 0.9 inches, 1.0 inches, 1.1 inches, 1.2 inches, 1.3 inches, 1.4 inches, 1.5 inches, 1.6 inches, 1.7 inches, 1.8 inches, 1.9 inches, and 2.0 inches. In some embodiments, at least one indent  632  can be disposed at least 0.5 inches (or any other suitable distance, such as those listed in this paragraph) from a lower end  636  of elongated portion  628 . In some embodiments, the elongated portion can have a plurality of indents  632  disposed sequentially, as shown, along at least a portion of the length of the elongated portion. As a result of configuring any of the present devices (e.g., 10) in this manner, the device (and, more specifically support member  42 ′) can have a non-extended position in which support member  42 ′ is as close to the lateral member as possible, and any one of multiple extended positions that allow a wearer of the device, who desires to use it as a training aide to view real-time video images of a sports movement (or the like) the wearer performs, to adjust the height of the lateral portion to best suit the sports movement the wearer wishes to perform. As described in greater detail below, embodiments of the device are also configured such that the frame can be pivoted or rotated such that, when the device (or, more specifically, the support member of the device) is in an extended position (so that the lateral member has been raised to a degree off of the wearer&#39;s nose), the angle of the video screen can be adjusted to be viewed (or more easily viewed) by the wearer. These two features—extendability of support member  42 ′ and pivotability of the frame relative to the lateral member—can be combined to best suit a given use of embodiments of the devices. 
     In the depicted embodiment, tab  616  is integrally formed with the adjustment member such that the second end of the tab resists lateral movement relative to the first end of the tab. In this way, the tab provides some spring-type resistance to removal of the protrusion from an indent  632  so as to resist linear movement of the elongated portion of the support member relative to the adjustment member. In other embodiments, the tab can be a separate piece that is coupled to the adjustment member for similar effect. In some embodiments, the tab can comprise two or more protrusions; or the tab can be omitted entirely and the protrusion disposed on another portion of the adjustment member. The adjustment member can be coupled to the lateral member by any suitable means. For example, the adjustment member can comprise a clip  640 , and the lateral portion can comprise a corresponding receiver (e.g., slot  156 ) for mechanically receiving or engaging the clip  640  of the adjustment member. In other embodiments, the adjustment member can be coupled to the lateral member by any suitable means, including, for example, adhesive, screws, pins, rivets, or the like. In this way, adjustment member  608  can be coupled to the lateral member and support member  42 ′ such that, for example, the adjustment member is substantially fixed relative to the frame, and the support member is slidable relative to, or slidably coupled to, the adjustment member. As used here, “slidable” and “slidably” include linear, ratchet-type interaction of protrusion  612  and plurality of indents  632 . 
     In some embodiments of the present methods, the video source is a video camera, and the methods include (1) positioning or configuring the video camera to be capable of capturing video data including video images of the user performing an activity (or multiple cameras positioned or configured to capture video images of the user from different angles); (2) performing an activity; (3) capturing video data (e.g., capturing live video data to enable a live video data transmission) including video images of the user performing an activity; (4) transmitting wirelessly the video data to the receiver (e.g., over a distance up to, using the version of the emitter and transceiver described above, 100 yards); (5) transmitting or otherwise communicating the video data from the receiver to the display; and (6) displaying the video images included in the video data (e.g., while the activity is ongoing in some embodiments, and after the activity is complete in other embodiments). 
     The activity can comprise any one or more of performing a sports movement or technique (e.g., karate; swinging a piece of sports equipment (e.g., a golf club, a bat, a racket (e.g., tennis or squash), a hockey stick, or the like); throwing a ball (e.g., a football, a baseball, a softball, a basketball, or the like)); performing a medical procedure (e.g., surgery, suture, incision, and the like), or any other activity in which a video image of the activity may assist the user in improving or understanding the activity or the manner in which the activity is performed. In some embodiments, a wearer can practice a sports movement (e.g., swinging a golf club, throwing a pitch, shooting a free-throw, throwing a football, or the like) and use an embodiment of the present devices to view real-time video images of that movement as the wearer performs it. In this way, the wearer may be able to make adjustments to the movement, and view the result of those adjustments, more quickly than has been possible with previous training aides. In other embodiments, the video source capturing the sports movement (or the like) may be configured with data storage and playback capability such that a wearer can view stored video data of a previously-performed sports movement using embodiments of the present devices. 
     Some embodiments of the present methods include capturing video data of a certain type of sports movement—as it is repeated or while a user wearing the device is in a given position in a single movement—from several different angles, such as (for example) capturing video data a user addressing a golf ball before he swings the golf club, which allows the user to view, for example: his alignment with respect to the target (when the camera is positioned “behind” the user along the intended path of the shot); the position of his left arm (or the position of his hands, shoulders, etc.) at address (when the camera is positioned “in front of” the user perpendicular to the intended path of the shot); and any other aspect of his setup or swing from any angle. 
     In other embodiments of the present methods, the video source is a video camera, and the methods include (1) positioning or configuring the video camera to be capable of capturing video data including video images of an object, a location, or the performance of an activity (or multiple cameras positioned or configured to capture video images of objects in different locations, of different locations, or of the performance of the activity from different angles); (2) capturing video data, including video data, of the object(s)/position/performance; (3) transmitting wirelessly the video data to the receiver (e.g., over a distance up to, using the version of the emitter and transceiver described above, 100 yards); (4) transmitting or otherwise communicating the video data from the receiver to the display; (5) in situations in which multiple cameras are used, toggling between video data sources to display video data from different cameras; and (6) displaying the video images included in the video data. The object(s) may be anything, including objects of interest in military or training exercises, objects of interest in hunts (e.g., wild game), objects in a race (e.g., cars on a track, runners on a track), or the like. In one embodiment, viewers/spectators of a race may rent the present devices, wear them during the race, and either actively toggle between different video sources during the race (e.g., to enable them to watch a given vehicle from several vantage points as it rounds a track) or passively view the data from toggled video sources. Similarly, the location may be any location, including locations of interest in military or training exercises, locations of interest in hunts (e.g., paths along which wild game travel), the location behind a vehicle (such as behind a car used in auto racing, or a delivery vehicle), the location (or locations) of interest to security guards (such as a location around a corner or in a room that is the guard has not yet entered, thus allowing the guard to verify that an area is clear before entering it), or the like. Similarly, the performance may be the performance of any activity, such as the performance of a medical procedure, such as an arthroscopic procedure (or an endoscopic procedure, more generally) in which the display is used to view real-time images from an arthroscopic camera, e.g., at a magnified resolution. One example in which multiple video sources may be used involves a quarterback wearing one of the present devices in a practice environment in which at least one camera is positioned to capture video images of him while another is positioned to capture video images of an area downfield from him, so that he can be shown live video data (taken from above the field, for example) of the manner in which the defense reacts to the offense as well, before/after toggling between video data inputs, as live video data of his movement(s). 
     In some embodiments of the present methods, a camera is positioned to capture images of a child (e.g., the user&#39;s child) and the images are transmitted to the receiver and communicated to the display, such that, for example, the user can view or monitor their child (e.g., a child in a crib and/or a child with special needs that requires ocular monitoring) even while the user is engaged in other activities (e.g., gardening, mowing, etc.). In other embodiments of the present methods, video data is transmitted from a computer or the like such that the display can display video data for the computer (e.g., video data that would otherwise be transmitted to and/or displayed on a monitor) such that, for example, the user can view the video data from the computer without disturbing or exposing the contents of the data to others around the user (e.g., on a plane, train, or the like). 
     The various illustrative embodiments of devices, systems, and methods described herein are not intended to be limited to the particular forms disclosed. Rather, they include all modifications, equivalents, and alternatives falling within the scope of the claims. For example, in some embodiments, such as those depicted above that include arms, the arms could be omitted and the display could be integral to a hat, helmet, or the like. As another example, any stereoscopic video display system may be used with the present devices, whether that includes one or more than one video screen. As yet another example, while the embodiments depicted above that include a hat bill-attachment structure are shown with an elastic band, the present hat bill-attachment structures can take any other suitable form, including, for example, a pair of clips that attach (e.g., by clamping down on) opposing sides of a hat bill. Furthermore, the depicted elastic band may include an slide-resistant element, such as one or more sections that include hook and loop fasteners that would couple to the top of the hat bill and tend to prevent the band from sliding out of position. 
     The claims are not intended to include, and should not be interpreted to include, means-plus- or step-plus-function limitations, unless such a limitation is explicitly recited in a given claim using the phrase(s) “means for” or “step for,” respectively.