Patent Publication Number: US-7916467-B2

Title: Methods and apparatuses for docking a portable electronic device that has a planar like configuration and that operates in multiple orientations

Description:
The present application claims priority from and is a continuation application of U.S. application Ser. No. 12/030,201, filed Feb. 12, 2008, which is a continuation application of U.S. application Ser. No. 11/200,787, filed Aug. 9, 2005 (now U.S. Pat. No. 7,352,567), the entire contents of which are herein incorporated by reference for all purposes. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates generally to docking stations for portable electronic devices. More particularly, the present invention relates to docking stations for portable electronic devices, which have planar like configurations and that operate in multiple orientations. Even more particularly, the present invention relates to improved techniques for transferring data and/or power between portable electronic devices and the docking stations. 
     BACKGROUND OF THE INVENTION 
     Many electronic devices include a docking station for providing a convenient interface for transferring data between the electronic device and other devices, such as a computers, speakers, monitors, and printers. The docking station may also include an interface for connecting to a power source so that the electronic device can be powered or charged (e.g., battery). In most cases, the docking stations include a cavity within which the electronic device is received. The cavity is configured to have a size and shape that coincides with the size and shape of the electronic device so that the electronic device rests snuggly within the cavity. Furthermore, the cavity typically includes a connector therein for operatively engaging a port of the electronic device when the electronic device is positioned within the cavity. The connector is typically coupled to the external systems (e.g., computer, power source) through a cable so that communications between the electronic device and the external systems can take place. 
     Recently, inductive charging units have been implemented in electronic devices, the most famous of which is the Sonic Care toothbrush manufactured by Philips of the Netherlands. The toothbrush and the charging dock form the two part transformer with the primary induction coil contained in the dock and the secondary induction coil contained in the toothbrush. When the end of toothbrush is placed in a cavity of the dock, the complete transform is created and the induced current in the secondary coil charges the battery. 
     Inductive charging pads have also been developed. The pad works similar to the toothbrush, however, the pad typically includes multiple transformers so that the electronic device can be placed in any orientation on the pad. When the electronic device is placed on the pad, one of the transformers of the pad induces current in the transformer of the electronic device, and this current charges the battery of the electronic device. Unfortunately, the efficiency of the transform is not very good since the transformer located on the electronic device typically does not align with the transformers of the pad, i.e., does not create closed magnetic loop and therefore there is no direct inductive coupling. 
     SUMMARY OF THE INVENTION 
     The invention relates, in one embodiment, to a docking system. The docking system includes a portable electronic device capable of operating in multiple orientations including vertical and horizontal. The docking system also includes a docking station configured to mechanically accept and operatively interface with the portable electronic device in any of its multiple orientations including vertical and horizontal. 
     The invention relates, in another embodiment, to a docking system. The docking system includes a portable electronic device having a front side and substantially planar back side opposite the front side and including a full screen display at the front side and a power transfer mechanism at the substantially planar back side. The full screen display is configured to display content in an upright manner whether the portable electronic device is used horizontally or vertically. The docking system also includes a docking platform having a substantially planar front side configured to support the substantially planar backside of the portable electronic device thereon, and including a power transfer mechanism at the substantially planar front side. The power transfer mechanism of the portable electronic device and power transfer mechanism of the docking platform are aligned along an axis and juxtaposed relative to one another when the portable electronic device is supported by the docking platform. The power transfer mechanism of the portable electronic device and the power transfer mechanism of the docking platform are rotationally symmetric about the axis such that they maintain communication with one another whether the portable electronic device is placed horizontally or vertically on the docking platform. 
     The invention relates, in another embodiment, to a docking station. The docking station includes a platform that allows a substantially planar portable electronic device to be docked in multiple orientations about an axis. The docking station also includes an interface mechanism located at the platform and configured to interface with a corresponding interface mechanism of the portable electronic device when the portable electronic device is docked to the platform in any of its multiple orientations. 
     The invention relates, in another embodiment, to a docking station. The docking station includes a substantially planar platform for receiving a substantially planar portable electronic device thereon. The substantially planar platform receives the portable electronic device in a plurality of orientations about an axis. The plurality of orientations includes at least a horizontal orientation and a vertical orientation. The docking station also includes an interface mechanism disposed in the substantially planar platform and having a center located at the axis. The interface mechanism communicates with a corresponding interface mechanism disposed in the substantially planar portable electronic device when the substantially planar portable electronic device is placed on the substantially planar platform in any of the plurality of orientations. The docking station further includes one or more alignment features for aligning a center of the corresponding interface mechanism of the substantially planar portable electronic device with the axis when the substantially planar portable electronic device is placed on the substantially planar platform in any of the plurality of orientations. 
     The invention relates, in another embodiment, to a portable electronic device configured to operate in multiple orientations including horizontal and vertical orientations. The portable electronic device displays content in an upright manner in both the horizontal and vertical orientations. The portable electronic device has a substantially planar back side for placement on a planar front side of a docking platform in each of its multiple orientations. The portable electronic device includes an interface mechanism located at the back side of the portable electronic device and configured to interface with a corresponding interface mechanism located at the front side of the docking platform when the portable electronic device is placed on the docking platform in any of its multiple orientations. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which: 
         FIG. 1  is a simplified diagram of a docking system, in accordance with one embodiment of the present invention. 
         FIG. 2A  is a perspective diagram of a docking system including a horizontally positioned portable electronic device, in accordance with one embodiment of the present invention. 
         FIG. 2B  is a perspective diagram of a docking system including a vertically positioned portable electronic device, in accordance with one embodiment of the present invention. 
         FIGS. 3A and 3B  are side views of a docking system, in accordance with one embodiment of the present invention. 
         FIG. 4A  is a front view of a docking station, in accordance with one embodiment of the present invention. 
         FIG. 4B  is a front view of a docking station with a horizontally positioned portable electronic device positioned thereon, in accordance with one embodiment of the present invention. 
         FIG. 4C  is a front view of a docking station with a vertically positioned portable electronic device positioned thereon, in accordance with one embodiment of the present invention. 
         FIG. 5A  is a front view of a docking station, in accordance with one embodiment of the present invention. 
         FIG. 5B  is a front view of a docking station with a horizontally positioned portable electronic device positioned thereon, in accordance with one embodiment of the present invention. 
         FIG. 5C  is a front view of a docking station with a vertically positioned portable electronic device positioned thereon, in accordance with one embodiment of the present invention. 
         FIG. 6  is a front view of a docking station, in accordance with one embodiment of the present invention. 
         FIG. 7  is a perspective view of a docking system, in accordance with one embodiment of the present invention. 
         FIG. 8  is a diagram of a docking system, in accordance with one embodiment of the present invention. 
         FIG. 9  is a side elevation view, in cross section, of an interface system that uses inductive coils, in accordance with one embodiment of the present invention. 
         FIG. 10  is a diagram of an interface system that uses electrical contacts, in accordance with one embodiment of the present invention. 
         FIG. 11  is a diagram of an interface system that uses electrical contacts, in accordance with one embodiment of the present invention. 
         FIGS. 12A and 12B  are diagrams of another style of docking system, in accordance with one embodiment of the present invention. 
         FIG. 13  is a perspective diagram of another docking system, in accordance with one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention generally pertains to a docking system that includes a docking station and a planar like portable electronic device, which can be used in multiple orientations (e.g., vertical and horizontal). By way of example, the portable electronic device may include a display that displays content in an upright manner regardless of the orientation of the portable electronic device. One aspect of the invention relates to techniques for mechanically supporting and aligning the portable electronic device with the docking station. Another aspect of the invention relates to techniques for efficiently transferring data and/or power between portable electronic device and the docking station. In one embodiment, the mechanisms used to transfer data and/or power are rotationally symmetric so as to support the various orientations of the portable electronic device when the portable electronic device is docked to the docking station. 
     Embodiments of the invention are discussed below with reference to  FIGS. 1-13 . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes as the invention extends beyond these limited embodiments. 
       FIG. 1  is a simplified diagram of a docking system  10 , in accordance with one embodiment of the present invention. The docking system  10  includes a docking station  12  and a portable electronic device  14  that is capable of docking into the docking station  14 . 
     The docking station  12  provides a platform for quickly and easily coupling the portable electronic device  14  to another system or device as for example a computer, a power source, or peripheral devices such as a monitor, a keyboard, speakers, etc. A primary advantage of using a docking station  12  is that the user does not have to separately connect each of these various devices with the portable electronic device. 
     The portable electronic device  14  may be any electronic device that is easily transported by a user. By way of example, the portable electronic device  14  may generally correspond to computing devices such as laptops, tablet PC&#39;s, PDA&#39;s, media players (e.g., music players, video players or game players), cell phones, smart phones, GPS device, electronic books, and/or the like. 
     In one particular embodiment, the portable electronic device  14  is a handheld computing device. As used herein, the term “hand held” means that the electronic device is typically operated while being held in a hand. The hand held electronic device may be directed at one-handed operation and/or two-handed operation. In one-handed operation, a single hand is used to both support the device as well as to perform operations with the user interface during use. Cellular phones, PDAs, cameras, media players, and GPS units are examples of portable devices that can be operated solely with one hand. In the case of a cell phone, for example, a user may grasp the phone in one hand between the fingers and the palm and use the thumb to make entries using keys, buttons or a joy pad. In two-handed operation, one hand is used to support the device while the other hand performs operations with a user interface during use or alternatively both hands support the device as well as perform operations during use. Tablet PCs, electronic books and game players are examples of portable device that are typically operated with two hands. In the case of the tablet PC, for example, the user may grasp the tablet with one hand and make entries in the tablet using the other hand, or alternatively grasp the tablet in both hands and make entries using either or both hands while holding the tablet PC. 
     More particularly, the portable electronic device  14  may correspond to those portable electronic devices that are embodied in a picture frame format. That is, those devices that are substantially planar and configured with a full screen display or a near full screen display where the display fills up substantially the entire front surface of the portable electronic device  14 . It may extend edge to edge or it may fit within a small bezel of the housing at the edge of the device. The full screen display may have a variety of different configurations depending on the overall footprint of the device. If the device  14  is wide, the full screen display may have a traditional aspect ratio of about 4:3. If the device  14  is elongated, the full screen display may have an aspect ratio that is more panoramic such as 16:9. Examples of picture frame electronic devices are tablet PCs, and electronic books. It should be noted, however, that almost any of the devices mentioned above may be configured in this manner. Examples of full screen handheld devices can be found in U.S. Patent Application Nos. 60/658,777, 11/057,050 and 11/115,539, all of which are herein incorporated by reference. 
     Referring to the docking station  12 , the docking station  12  may be a stand alone unit that communicates with other devices or systems through wired or wireless connections, or alternatively, the docking station  12  may be integrated directly into the other devices or systems. In the case of a stand alone unit, the docking station  12  may include connectors, jacks, ports or transceivers that provide external connections to the other devices or systems. In the case of an integrated docking station, the docking station  12  may be hard wired directly to the components of the host device. In either case, the docking station  12  includes a holding system for receiving and supporting the portable electronic device  14  when the portable electronic device  14  is desired to be docked. The holding system may be configured to support the portable electronic device  14  in an upright (e.g., vertical), laid down (e.g., horizontal) or tilted position (e.g., angled) while maintaining/allowing access to the U.I. portion (e.g., at least the display) of the portable electronic device  14 . 
     In one particular embodiment, the docking station  12  is configured like an easel. In this embodiment, the docking station  12  may include a vertical or angled platform on which the backside of the portable electronic device  14  rests when the portable electronic  14  is docked in the docking station  12 . This is arrangement is particularly useful with portable electronic devices with a planar like configuration such as those with a full screen display. The docking station  12  may further include a fixed or adjustable leg or arm for supporting the platform and thus the portable electronic device  14  in one or more positions. 
     Alternatively, the docking station  12  may include a cavity or basin for receiving an edge or end of the portable electronic device  14 . Examples of cavity style docking stations can be found in U.S. patent application Ser. Nos. 10/423,490, 11/125,883, both of which are herein incorporated by reference. 
     In order to operatively connect the portable electronic device  14  with the docking station  12 , the docking station  12  may include an interface system  16  that interfaces with a corresponding interface system  18  on the portable electronic device  14  when the portable electronic device  14  is docked in the docking station  12 . The interface systems  16  and  18  may be widely varied and may include various mechanisms for transferring data and/or power between the portable electronic device  14  and the docking station  12 . For example, each of the systems  16  and  18  may include a power transfer mechanism  20  and a data transfer mechanism  22 . When docked, the data transfer mechanisms  22  transfer data between the docking station  12  and the portable electronic device  14 . Data can therefore be uploaded or downloaded to and from the portable electronic device  14 . Furthermore, the power transfer mechanisms  20  transfer power from the docking station  12  to the portable electronic device  14 . The power transfer can be used to power and/or charge the portable electronic device  14  when it is docked. In some cases, the data and power mechanisms are separate components while in other cases the data and power mechanisms are integrated together. 
     The interfacing systems  16  and  18 , including both the data mechanisms  22  and the power mechanisms  20 , can be embodied in various forms and combinations including contact based and non-contact based platforms. By way of example, contact based platforms may include electrical contacts that are capable of transferring data and/or power when the electrical contacts are electrically engaged or in contact with one another. Non-contact based platforms, on the other hand, may include inductive devices, optical devices, or wireless devices that are capable of transferring data and/or power without mating contact. 
     When electrical contacts are used, the electrical contacts may be implemented in connectors and/or they may be surface or flush mounted on the housings of the portable electronic device and the docking station. In either case, each device includes a set of corresponding contacts that when in contact allow data and power to be transferred therethrough. With regards to connectors, the electrical contacts may be tabs that are positioned side by side, or they may be arranged as pins. With regards to flush mounts, the electrical contacts may be flat planar contacts that lie flush on the surface of the housing. In some cases, the flush mounts may be spring-loaded or utilize a flexure in order to ensure mating contact with each other when the portable electronic device is docked. In all of these arrangements, the electrical contacts are separately wired to a control board (e.g., PCB) located inside the respective devices. The control board routes the signals to their desired location within the devices. By way of example, the electrical contacts may be directly or indirectly (e.g., via wires) soldered to the control board. Alternatively a flex circuit may be used. 
     With regards to non-contact platforms, inductive coils can be placed in each device to transfer both power and data. The inductive coils are typically hidden from view behind the housings of each device and therefore they are more aesthetically pleasing than electrical contacts, which need to be exposed in order to operate effectively. Furthermore, inductively based systems are more robust than electrical contacts. For example, there are no contacts to wear out and/or oxidize. 
     Wireless devices may include receivers, transmitters, and transceivers of various types including RF, Bluetooth, 802.11 UWB (ultra wide band), and the like. Like inductive devices, wireless devices are typically hidden from view and therefore are more aesthetically pleasing and robust (e.g., fully enclosed with no lines, or breaks in the surface of the housings). Optical devices may include a light source and light detector for data, and a light source and photovoltaics device for power. Each of these devices are typically positioned behind a translucent region of the housing so as to allow proper communication therebetween. With regards to data, an IR link may be used. 
     The docking system  10  may use any combination of contact and non-contact platforms in order to serve the needs of the portable electronic device  14 . 
     In one particular embodiment, both power and data are transferred with non contact based platforms, and more particularly non contact based platforms that are enclosed such as inductive based systems and wireless systems. In inductive based systems, the docking station  12  includes the primary coil and the portable electronic device  14  includes the secondary coil. In wireless systems, both the docking station  12  and the portable electronic device  14  include their own transceiver that both transmits and receives data. In one implementation, both data and power are transferred via the inductance-based system. For example, low frequency electrical current may be passed from the primary coil to the secondary coil in order to power or charge the portable electronic device and high frequency current may be passed from one coil to the other in order to send/receive data. The data and power inductors may be separate, integral or they may be superimposed on one another. In another implementation, power is transferred via an inductance-based system and data is transferred via a wireless system. The combination of inductance and wireless provides an efficient way to transfer both power and data while keeping both the docking station and portable electronic device fully enclosed. 
     In some cases, the interfacing systems need to be properly aligned in order to ensure proper connections and therefore efficient power and data transfer between the docking station and the portable electronic device. This is especially important for electrical contacts, inductive transformers and optical devices, and less important for wireless devices. Accordingly, the docking station  12  may include one or more alignment features  24  that help register or align the portable electronic device  14  with the docking station  12  and further to help align the corresponding interface mechanisms with one another. The alignment features  24  may be fixed or adjustable, and may include such elements as pins, shelves, guides, reference surfaces, keyways, and the like. The alignment features  24  may also provide visual alignment clues or fiduciaries for helping the user position the portable electronic device  14  on the docking station  12 . 
     Although not shown, in some cases, the docking system  10  may further include retention mechanisms  25  for securing the portable electronic device  14  to the docking station  12 . By way of example, the retention mechanisms  25  may include one or more magnets, snaps, latches, catches, friction couplings, detents, tabs, slots, and/or the like. In some cases, the docking system  10  may even include a lock so that portable electronic device  14  is only removable if the user has the proper key, combination or access code. 
     In accordance with one embodiment, the portable electronic device  14  is capable of operating in multiple orientations about an axis. For example, as shown in  FIG. 2A , the portable electronic device  14 , which includes a full screen display  15 , can operate in a substantially horizontal orientation (0/360 and/or 180), or as shown in  FIG. 2B , the portable electronic device  14  can operate in a substantially vertical orientation (90 and/or 270). 
     In one embodiment, although used in different orientations the content being displayed by the display  15  of the portable electronic device  14  follows the user rather than the orientation of the portable electronic device  14  so that the content is displayed in its correct position relative to the user (e.g., upright). That is, the portable electronic device  14  is capable of displaying content on its display  15  in an upright position no matter what orientation the portable electronic device  14  is in as for example when the device  14  is used horizontally or vertically so that the user can easily view the content. Furthermore, the portable electronic device  14  may be capable of switching the viewing mode on the display  15 , including landscape and portrait modes, based on the orientation of the portable electronic device  14 . For example, landscape mode may be used when the device  14  is oriented horizontally, and portrait mode may be used when the device  14  is oriented vertically. Picture frame devices are good examples of devices that can be used in this manner. It should be noted however that this is not a requirement and that any device with a display can be configured to operate in this manner. 
     The function of adjusting the orientation and mode of the content being displayed may be performed manually as part of a user selection or automatically as the user reorients the device. 
     When performed manually, the user may select what orientation and mode to display the content based on how the user is going to orient the device. For example, if the user is going to use the device horizontally, the user may place the viewing orientation in horizontal and landscape modes and if the user is going to use the device vertically, the user may place the viewing orientation in vertical and portrait modes. 
     When performed automatically, the device itself may determine what orientation to display the content based on the orientation of the device. By way of example, the portable electronic device may include an accelerometer that helps determine the orientation of the device. The accelerometer senses the orientation of the device, and informs the control system of the portable electronic device  14  so that the displayed content can be kept upright and in the right viewing mode. The control system can make the adjustments over a wide range including for example device orientations anywhere between 0 and 360 degrees, or a subset such as for example device orientations of 0/360, 90, 180 and 270, or further a subset of just 0 and 90 degrees. 
     In accordance with another embodiment of the present invention, because the device  14  can be used in multiple orientations, the docking station  12  may be configured to support the multiple orientations of the portable computing device  14 . That is, the portable electronic device  14  can be positioned on the docking station  12  in any of its orientations while still allowing data and/or power communications to exist therebetween. In some cases, the docking station  12  may provide 360 degree flexibility to the portable electronic device  14 . In other cases, the docking station  12  may provide only a subset of 360 degree flexibility such as for example at 0/360, 90, 180, and 270 degrees. Furthermore, the docking station  12  may provide a tighter subset as for example 0/360 and 90 degrees. The positions allotted by the docking station  12  are typically based on the various orientations of the portable electronic device  14 . For example, if the portable computing device  14  only supports 0, 90, 180 and 270, then the same can be said of the docking station  12 . 
     In the illustrated embodiments shown in  FIGS. 2A and 2B , the docking station  12  is embodied as an easel. The docking station  12  therefore includes a platform  26  for receiving the backside  28  of the portable electronic device  14 . In the embodiment shown, the platform  26  includes a substantially flat planar surface that mates with a substantially flat planar backside  28  of the portable electronic device  14 . As such, the portable electronic device  14  can rest on or lie on the platform  26  in any of its orientations including the vertical and/or horizontal orientations. The docking station  12  may also include a leg  30  for supporting the platform  26  and thus the portable electronic device  14 . In some cases, the platform  26  is fixed to the leg  30  and in other cases the platform  26  can pivot relative to the leg  30  in order to adjust the angle of tilt. The docking station  12  may further include a retention lip  32  that supports the portable electronic device  14  in an upright position adjacent the platform  26 , i.e., keeps the back side of the portable electronic device flush with the platform as well as prevents the portable electronic device  14  from slipping off the platform  26 . Although a leg and retention lip is shown, it should be appreciated that these are not limitations and that other support mechanisms may be used. 
     In order to allow communications between the docked portable electronic device  14  and the docking station  12 , the docking system of  FIGS. 2A and 2B , further include one or more dock side interface mechanisms  16  and one or more device side interface mechanisms  18  that operatively couple with one another to provide communications between the portable computing device  14  and the docking station  12 . As mentioned in  FIG. 1 , the interface mechanisms may be configured to transfer data and/or power between the portable computing device  14  and the docking station  12 . 
     In accordance with one embodiment, the interface mechanisms  16  and  18  are configured to communicate with one another in whatever position the portable electronic device  14  is oriented in relative to the docking station  12 . That is, the orientation of the portable computing device  14  is irrelevant to ensure communications between the portable computing device  14  and the docking station  12 . The interface mechanisms  16  and  18  operatively couple with one another when the portable computing device  14  rests on the platform regardless of the orientation of the portable computing device  14  thereon. For example, the interface mechanisms  16  and  18  are capable of interfacing with one another if the device  14  is placed at various orientations between 0 and 360 degrees, more particularly at 0/360, 90, 180 or 270 degrees, and even more particularly at 0/360 and 90 degrees relative to the platform  26 . In essence, the interface mechanisms are rotationally symmetric so that regardless of the orientation of the portable electronic device relative to the docking station the coupling therebetween still works correctly. 
     Wireless devices can easily support such an arrangement. For example, the docking station  12  may include a transceiver in its platform  26  or leg  30 , and the portable electronic device  14  may include a transceiver inside its housing. The transceivers can be placed anywhere relative to each other and still communicate via a wireless signal. 
     With regards to non wireless devices, including contact or non contact based, the dock side mechanisms  16  and the device side mechanisms  18  are positioned in a way that they are juxtaposed and aligned in each of the various orientations supported by the portable computing device  14  thereby ensuring an efficient connection between the docking station and the portable electronic device  14 . 
     Referring to  FIGS. 3A and 3B , the dockside interface mechanisms  16  are located along the planar reference surface of platform  26  and the device side interface mechanisms  18  are located along the planar surface of the backside  28  of the portable computing device  14  thereby allowing them to be adjacent and flush with one another when the portable electronic device  14  is docked to the docking station  12 . Furthermore, the dock side mechanisms  16  and device side mechanisms  18  are positioned within their respective planes (e.g., X and Y) so that the axis of each of the interface mechanisms  16  and  18  line up when the portable electronic device  14  is placed on the docking station  12  in each of its orientations including for example horizontal ( FIG. 3A ) and vertical ( FIG. 3B ). That is, the device side mechanism  18  aligns with the dock side mechanism  16  in each of the allowed orientations of the portable electronic device including for example the vertical and horizontal orientations. In essence, the interface mechanisms  16  and  18  are configured to be rotationally symmetric about the axis  36  so that the interface elements (e.g., contacts) of the device  14  are in their proper position relative to the interface elements (e.g., corresponding contacts) of the dock  12  in each of the orientations supported by the portable electronic device  14 . 
     Alternatively, multiple interface mechanisms may be used to ensure coupling between the docking station and the portable electronic device. For example, there may be two dock side interface mechanisms, one for horizontal orientations and one for vertical orientations. 
     In one embodiment, the mechanical design of the docking station  12  is such that if the portable electronic device  14  is inserted horizontally or vertically or some angle therebetween, the interface mechanisms still line up. For example, the docking station  12  may include X and/or Y registration features that help guide and align the portable electronic device in X and Y while allowing rotations about Z. In this embodiment, the platform defines the X/Y plane. Although X, Y and Z coordinates are used, it should be appreciated that this is done for ease of discussion and therefore the invention is not limited to X, Y Z coordinates. 
     The registration features may for example be shelves or pins that abut the edge of the portable electronic device  14  thereby registering the portable electronic device  14  relative to the docking station  12  regardless of the orientation of the portable electronic device  14  (e.g., equal X and Y). In one implementation, the registration features only support one orientation of horizontal and vertical as for example 0 and 90 degree orientations (see for example  FIGS. 4A-C ). In another implementation, the registration features support multiple orientations of horizontal and vertical as for example 0, 90, 180 and 270 (see for example  FIGS. 5A-C  and  6 ). In yet another implementation, the registration features support all angles through 360 degrees (see for example  FIG. 7 ). 
     Referring to  FIGS. 4A-C , in one embodiment, the mechanical design of the docking station  12  is configured to only support one orientation of horizontal and vertical as for example 0 and 90 degree orientations. As shown, the docking station  12  includes an X alignment surface  40  and a Y alignment surface  42 , which abut against the edges of the portable electronic device  14  when the portable electronic device  14  is placed either horizontally or vertically, and more particularly 0 and 90 degrees, in the docking station  12 . The alignment surfaces  40  and  42  are configured to align the axis  19  of the device side interface mechanism  18  with the axis  17  of the of the dock side interface mechanism  16  in the X and Y directions for both 0 and 90 degree orientations. 
     The X alignment surface  40  is placed along the X axis of the platform  26  at a distance D from the axis  17  of the dock side interface mechanism  16 , and the Y alignment surface  42  is placed along the Y axis of the platform  26  at the same distance D from the axis of the dock side interface mechanism  16 . 
     The portable electronic device  14  includes four edges, a first edge  44 , a second edge  46 , a third edge  48  and a fourth edge  50 . The device side mechanism  18  is placed the same distance D from the first, second and third edges  44 ,  46 , and  48  of the portable electronic device  14 . 
     When the device  14  is placed at horizontal 0 degrees in the docking station  12  (as shown in  FIG. 4B ), the first edge  44  abuts against the X alignment surface  40  and the third edge  48  abuts against the Y alignment surface  42 . Because the interface mechanisms  16  and  18  are located the same distance in the X and Y locations from the abutted edges, the interface mechanisms  16  and  18  are aligned when positioned in this manner. 
     When the device is placed at vertical 90 degrees in the docking station  12  (as shown in  FIG. 4C ), the first edge  44  abuts the Y alignment surface  42  and the second edge  46  abuts the X alignment surface  40 . Because the interface mechanisms  16  and  18  are located the same distance in the X and Y locations from the abutted edges, the interface mechanisms  16  and  18  are aligned when positioned in this manner. 
     Referring to  FIG. 5 , in another embodiment, the mechanical design of the docking station  12  is configured to support multiple orientations of horizontal and vertical as for example 0, 90, 180 and 270 degree orientations. As shown, the docking station  12  includes first and second alignment systems  60  and  62 . The first alignment system  60  is configured to align the portable electronic device  14  in horizontal orientations including 0 and 180 degrees and the second alignment system  62  is configured to align the portable electronic device  14  in vertical orientations including 90 and 270 degrees. Each alignment system  60  or  62  includes spaced apart X alignment surfaces  64  and a Y alignment surface  66 . The spacing of the X alignment surfaces  64 A of the first alignment system  60  coincide with the length L of the portable electronic device  14  (horizontal). The spacing of the X alignment surfaces  64 B of the second alignment system  62  coincide with the width W of the portable electronic device  14  (vertical). 
     The X and Y alignment surfaces may for example protrude from the platform  26  so as to form recesses within which the portable electronic device  14  is placed, i.e., constrains the portable electronic device in X and Y. In one implementation, the depth of the recess coincides with the thickness of the portable electronic device so that the face of the alignment surfaces are flush with the front surface of the portable electronic device  14 . 
     The X alignment surfaces  64 A of the first alignment system  60  are placed at a distance D 1  from the center  17  of the dock side interface mechanism  16 , and the Y alignment surface  66 A of the first alignment system  60  is placed at a distance D 2  from the center  17  of the dock side interface mechanism  16 . Furthermore, the X alignment surfaces  64 B of the second alignment system  62  are placed at the distance D 2  from the center  17  of the dock side interface mechanism  16 , and the Y alignment surface  66 B of the second alignment system  62  is placed at the distance D 1  from the center  17  of the dock side interface mechanism  16 . 
     Moreover, the center  19  of the interface mechanism  18  of the portable electronic device  14  is positioned in the center of the portable electronic device  14 . The portable electronic device  14  includes four edges, a first edge  44 , a second edge  46 , a third edge  48  and a fourth edge  50 . The device side mechanism  18  is placed a distance D 1  from the first and fourth edges  44  and  50  of the portable electronic device  14 , and a distance D 2  from the second and third edges  46  and  48  of the portable electronic device  14 . 
     When the device  14  is placed at horizontal 0 or 180 degrees in the docking station  12  (as shown in  FIG. 5B ), the first and fourth edges  44  and  50  abut against the X alignment surfaces  64 A of the first alignment system  60 , and the second or third edges  46  or  48  abut against or rest on the Y alignment surface  66 A of the first alignment system  60 . Edge  46  rests on the Y alignment surface  66 A at the 0 degree orientation, and edge  48  rests on the Y alignment surface  66 A at the 180 degree orientation. Because the interface mechanisms  16  and  18  are located the same distances in the X and Y locations from the abutted edges, the interface mechanisms  16  and  18  are aligned when positioned in this manner. 
     When the device  14  is placed at horizontal 90 or 270 degrees in the docking station  12  (as shown in  FIG. 5C ), the second and third edges  46  and  48  abut against the X alignment surfaces  64 B of the second alignment system  62 , and the first or fourth edges  44  and  50  abut against or rest on the Y alignment surface  66 B of the second alignment system  62 . Edge  44  rests on the Y alignment surface  66 B at the 90 degree orientation, and edge  50  rests on the Y alignment surface  66 B at the 270 degree orientation. Because the interface mechanisms  16  and  18  are located the same distances in the X and Y locations from the abutted edges, the interface mechanisms  16  and  18  are aligned when positioned in this manner. 
       FIG. 6  is similar to the embodiment shown in  FIG. 5  except that posts or guides  70  are used rather than elongated surfaces. As shown, the docking station  12  includes a first set of posts  70 A for aligning the portable electronic device  14  in the X direction when the portable electronic device  14  is placed horizontally into the docking station  12 . The first set of posts  70 A are analogous to the X alignment surfaces of the first alignment system in  FIG. 5 . 
     The docking station  12  also includes a second set of posts  70 B for aligning the portable electronic device  14  in the X direction when the portable electronic device  14  is placed vertically into the docking station  12 . The second set of posts  70 B also align the portable electronic device  14  in the Y direction when the portable electronic device  14  is placed horizontally into the docking station  12 . The second set of posts  70 B are analogous to the X alignment surfaces of the second alignment system and the Y alignment surface of the first alignment system of  FIG. 5 . 
     The docking station  12  further includes a third set of posts  70 C for aligning the portable electronic device  14  in the Y direction when the portable electronic device  14  is placed vertically into the docking station  12 . The third set of posts  70 C are analogous to the Y alignment surface of the second alignment system of  FIG. 5 . 
     It should be noted that the present invention is not limited to only alignment surfaces or only posts and that a combination of posts and alignment surfaces may be also be used. 
     Referring to  FIG. 7 , in another embodiment, the mechanical design of the docking station  12  is configured to support all orientations of the portable electronic device  14  through 360 degrees. As shown, the platform  26  of the docking station  12  includes a circular recess  80  and the portable electronic device  14  includes a circular protrusion  82  that is inserted into the circular recess  80 . The circular protrusion  82  and the circular recess  80  have similar shapes, sizes so that they matingly engage, i.e., the outer perimeter of the circular protrusion  82  is placed within and against the inner perimeter of the circular recess  80 . When engaged, the portable electronic device  14  is secured within the X/Y plane (platform) and is able to rotate through 360 degrees about the center of the circular protrusion/recess  80 / 82 . That is, the edge of the protrusion  82  abuts the edge of the recess  80  thereby preventing linear motion in the X/Y plane. Further, because the elements are circular, the protrusion  82  is allowed to rotate within the recess  80 . 
     In the illustrated embodiment, the interface mechanism  16  of the docking station is centered at the center of the circular recess  80 , and the interface mechanism  18  of the portable electronic device  14  centered at the center of the circular protrusion  82 . The recess/protrusion interface  80 / 82  is therefore configured to align the axis of the dock side interface mechanism  16  with the axis of the device side interface mechanism  18  while allowing the portable electronic device  14  full rotation about the axis, i.e., the portable electronic device can be rotated through 360 degrees without effecting the alignment. In most cases, the depth of the recess  80  is configured similarly to the depth of the protrusion  82  so that the front surface  84  of the recess  80  lies flush with the back surface  86  of the protrusion  82  when the protrusion  82  is inserted within the recess  80 . This may also cause the backside of the portable electronic device  14  to lie flush with the remainder of the platform  26 . 
     In some cases, the platform  26  may further include a slot  88  that guides the circular protrusion  82  to the circular recess  80 . The slot  88  typically has a width that coincides with the diameter of the protrusion  82 . The slot  88  may follow various paths within the X/Y plane. In the illustrated embodiment, the slot  88  extends from the top of the platform  26  to the circular recess  80  in the Y direction. The protrusion  82  therefore rests on the bottom surface of the circular recess  80  and is prevented from venturing upwards due to its weight (gravity). The slot  88  and recess  80  may further include a channel  90  along their edges for receiving a flange  92  of the circular protrusion  82 . When engaged, the flange/channel allows the portable electronic device  14  to be slidably received and retained to the platform  26 . In most cases, the flange/channel are dimensioned to place the backside of the circular protrusion  82  substantially flush with the front surface of the circular recess  80 . 
     Although the recess and protrusion are described as circular, it should be appreciated that this is not a limitation. In some cases, the recess and protrusion may be square. This particular implementation is capable of supporting 0, 90, 180 and 270 orientations. 
     Referring to  FIG. 8 , one embodiment of the docking system  10  will be described in greater detail. In this embodiment, the interface system includes opposing power transfer mechanisms  20  that are configured to be aligned along their center axis and substantially juxtaposed relative to one another when the portable electronic device  14  is placed in any orientation within the docking station  12 . This can be accomplished using any of the docking systems described above. The opposing power transfer mechanisms  20  may be embodied as electrical contacts, inductors, and/or the like. 
     The power transfer mechanism  20 B of the portable electronic device  14  is operatively coupled to a power management circuit  100  that controls the power operations of the portable electronic device  14 . The power management circuit  100  may for example control power to various mechanisms within the portable electronic device  14 . The power may be used to operate the portable electronic device  14  or alternatively to recharge a battery  102  of the portable electronic device  14 . By way of example, the power management circuit  100  may be a dedicated power controller or alternatively may be part of a main processor of the portable electronic device. 
     If AC power is delivered through power transfer mechanisms  20 , the portable electronic device  14  may further include a rectifier  104  that converts the AC power to DC power and/or adjusts DC power to an acceptable level. 
     The power transfer mechanism  20 A of the docking station  12  is operatively coupled to a power management circuit  106  that controls power transmissions through the docking station  12 . The power management circuit  106  is operatively coupled to a power source  108 . This may for example be accomplished through a power cable  110  that connects to a power outlet  112  via a power plug  114 . 
     If the docking station  12  is configured to transmit DC power to the electronic device  14 , the docking station  12  may further include a transformer/rectifier  116  for converting AC power to DC power, which can be used directly by the portable electronic device  14 . 
     In the illustrated embodiment, the opposing power transfer mechanisms  20  are inductively based and therefore the docking station  12  includes a primary inductive coil  120  and the portable electronic device  14  includes a secondary inductive coil  122  that cooperate to form a two part transformer. When the portable electronic device  14  is docked, the complete transformer is created, i.e., the inductors  120  and  122  are aligned along their axes and placed side by side without making electrical or mechanical contact. During power transfer, current is made to flow through the primary inductive coil  120 . The resulting magnetic flux induces an alternating current through the magnetic field and across the secondary inductive coil  122  thereby completing the circuit. The AC power received by the secondary inductive coil  122  is converted to DC power for operating the portable electronic device  14  and/or for storage in the battery  102 . 
     In one embodiment, the inductive coils  120  and  122  are rotationally symmetric about the axis so as to support the various orientations of the portable electronic device  14  relative to the docking station  12 . In the case of 360 degree flexibility, the inductive coils may be circular. In the case of 0, 90, 180, 270, the inductive coils may be circular square, octagon, or the like. 
       FIG. 9  is a side elevation view, in cross section, of an inductively based charging system  150 , in accordance with one embodiment of the present invention. The charging system  150  may for example be used in any of the embodiments described above. In this embodiment, the docking station  12  includes a first inductive coil  152 , and the portable electronic device  14  includes a second inductive coil  154 . The first inductive coil  152  is disposed inside the platform  26  behind the front wall  156  of the platform  26 . The second inductive coil  154  is disposed inside the housing  158  of the portable electronic device  14  behind the back wall  160  of the portable electronic device  14 . When the portable electronic device  14  is docked with the docking station  12 , as for example when the back wall  160  of the device  14  is placed against the front wall  156  of the platform  26 , the first and second coils  152  and  154  are juxtaposed and aligned along an axis of polar symmetry  162 . This ensures an efficient coupling between the two coils  152  and  154 . The inductive coils  152  and  154  may be aligned using any of the embodiments mentioned above. 
     To elaborate, the coils  152  and  154  generally include a permeable core  170  and wire windings  172  wrapped around the permeable core  170 . The capacity of the inductor  152 / 154  is controlled by various factors including, the number of coils, the material the coils are wrapped around (the core), the cross sectional area of the coil. In small handheld computing device such as cell phones, PDAs or media players, the inductive coils are generally configured to transmit between about 3-5 Watts of power. In larger handheld computing devices such as Tablet PCs, the inductive coils are generally configured to transmit between about 15-25 Watts of power. One advantage of planar like electronic devices is that larger inductive coils may be used, i.e., spread across the planar surface. 
     In one embodiment, the inductive coils  152  and  154  are circular and further toroidal or doughnut shaped in order to ensure rotational symmetry about the axis  162  when the portable electronic device  14  is placed on the docking station  12 . 
       FIG. 10  is a diagram of a charging system  180  that uses electrical contacts, in accordance with one embodiment of the present invention. The system  180  provides 360 degree flexibility and may be used in any of the docking systems described above. As shown, the docking station  12  includes a center contact  182  and a spaced apart concentric outer contact  184 . The center contact  182  and outer contact  184  are centered along the mating axis of the portable electronic device  14  and the docking station  12 . The portable electronic device  14  may include a matching set of center and outer contacts, or some variation of the center and outer contacts. For example, as shown, the portable electronic device  14  includes a center contact  186  that is centered along the mating axis of the portable electronic device and the docking station, and a point based or segmented outer contact  188  that is located at the same radius as the concentric outer contact  184 . A point based contact uses less space and is therefore more aesthetically pleasing. 
     When the portable electronic device  14  is docked with the docking station  12 , as for example when the back side of the device  14  is placed against the platform  26 , the center contacts  182  and  186  engage one another and the outer contacts  184  and  188  engage one another thereby allowing electrical signals (data and/or power) to pass between the docking station  12  and the portable electronic device  14 . In the case of power contacts, for example, the outer contacts  184 ,  188  may deliver the driving current to the battery or power manager of the portable electronic device  14  and the center contacts  182 / 186  may deliver the return current (e.g., ground) to the docking station  12  (or vice versa). 
     Alternatively, the configuration described above can be reversed, i.e., the concentric outer contact is placed on the portable electronic device  14  and the point based or segmented contact is placed on the docking station  12 . Either configuration allows 360 degree flexibility. 
     In one implementation, at least one set of electrical contacts is spring-loaded outwardly in order to ensure good electrical contact, and the opposing set of electrical contacts are flush or recessed mounted. For example, the docking station  12  may include spring loaded or flexure based electrical contacts or tabs that are biased outwardly from the front surface of the platform  26 , and that move inwardly under the force of the portable electronic device  14  when the portable electronic device  14  is placed against the platform  26 . The portable electronic device  14 , on the other hand, may include electric contacts or tabs that are flush mounted in the surface of the portable electronic device  14 . By flush it is meant that the outer surface of the electrical contact is substantially level with the outer surface of the housing of the portable electronic device  14 . 
     Referring to  FIG. 11 , the outer concentric outer contact  184  described above may be segmented instead of continuous. In this embodiment, the segmented outer contacts  184 A-D are positioned at locations that support the orientations of the portable electronic device  14 . In the illustrated embodiment, the segmented outer contacts are positioned at 0, 90, 180, and 270 degrees such that they support four orientations including two vertical orientations and two horizontal orientations. The portable electronic device  14  may include a matching set of contacts or some subset of contacts depending on the various needs of the portable electronic device  14 . In the illustrated embodiment, the portable electronic device  14  includes a center contact  186  and one outer contact  188  similar to the embodiment described in  FIG. 10 . The center contact  186  mates with the center contact  182  of the docking station  12 , and the outer contact  188  can optionally mate with any of the outer contacts  184 A-D of the docking station  12 . That is, the single outer contact can be positioned at any one of the positions 0, 90, 180, 270 ensuring that the outer contacts engage one another at each of the various orientations. The outer contacts  184 A-D are redundant, i.e., they are connected to the same power line (e.g., driving or return). 
       FIGS. 12A and 12B  are diagrams of another style of docking system  200 , in accordance with one embodiment of the present invention. In this embodiment, the docking station  12  includes a base  202  and a rotational platform  204  that are mechanically and operatively coupled together. The base  202  is configured to rotationally support the rotational platform  204 , and the rotational platform  204  is configured to attachably receive a portable electronic device  14 , particularly one with a planar back side and one that operates in multiple orientations. 
     The base  202  includes connectivity to other devices or systems. The base  202  may for example include additional data ports, audio ports, video ports, and power ports. The base  202  may also include elements for increasing the functionality of the portable electronic device  14  when it is attached to the platform  204 . For example, the base  202  may include additional processing capabilities. 
     The rotational platform  204 , on the other hand, includes connectivity to the portable electronic device  14 . By way of example, the platform  204  may include a series of contact or non-contact based mechanisms for communicating with the portable electronic device  14  when the portable electronic device  14  is attached to the platform  204 . For example, the platform  204  may include any of the interface mechanisms described above. Alternatively, because the portable electronic device  14  is fixed to the platform  204 , rotationally symmetric interface mechanisms are not necessary. As such, the interface mechanisms may also be embodied as a connector/port arrangement. For example, the portable electronic device  14  may include a data and/or power port that interfaces with a corresponding data and/or power connector on the platform  204 . An example of a connector arrangement that may be used is described in Ser. No. 10/423,490, which is herein incorporated by reference. 
     The manner in which the rotational platform  204  is rotatable may be widely varied. By way of example, the rotational platform  204  may be rotatably coupled to the base  202  via an axle arrangement  210 . For example, the platform  204  may include an axle  212  that is rotatably retained in a collar  214  on the base  202 . In one embodiment, the axle/collar interface includes an arrangement of slip rings in order to route the electrical signals between the rotational platform  204  and the base  202 . The axle/collar interface may additionally include frictional elements or detents that are capable of holding the rotational platform  204  in various orientations about the rotational axis. For example, frictional elements may be used to allow 360 degree flexibility and detents may be used to support 0, 90, 180 and 270 degree orientations. 
     The manner in which the portable electronic device  14  is removably attached may be widely varied. By way of example, snaps, latches, catches, lips, slots, tabs, locks, etc. may be used. When detached, the portable electronic device  14  can be operated as a remote device independent of the docking station  12 . When attached, the portable electronic device  14  is fixed to the rotational platform  204  and therefore it becomes an extension of the docking station  12 . In order to change the orientation of the portable electronic device  14 , the rotational platform  204 , which now carries the portable electronic device  14 , rotates around the rotational axis of the axle arrangement  210 . That is, the portable electronic device  14  is capable of rotating with the rotational platform  204  in order to support the various orientations of the portable electronic device  14 . 
     In one embodiment, the base  202  serves as a hub for downloading content onto the portable electronic device  14 . For example, the portable electronic device  14  may correspond to a video player, and the base  202  may serve as a location for downloading video such as movies onto the video player. The portable electronic device  14  may correspond to an electronic book, and the base  202  may serve as a location for downloading book content onto the electronic book. The portable electronic device  14  may correspond to a music player, and the base  202  may serve as a location for downloading songs onto the music player. The portable electronic device  14  may correspond to a tablet, and the base  202  may serve as a location for accessing the internet or connecting to peripheral devices such as printers, fax machines, scanners, and the like. 
     In another embodiment, the base  202  is a general purpose computer such as any of those manufactured by Apple Computer Inc., of Cupertino, Calif. In cases such as these the portable electronic device  14  may correspond to a monitor, tablet PC or even a device with limited computational abilities, i.e., a device with dedicated functionality. 
       FIG. 13  is a perspective diagram of another docking system  220 , in accordance with one embodiment of the present invention. In this embodiment, the docking station  12  includes a base  222  and a multi degree of freedom platform  224 . The platform  224  is coupled to an arm  226  via multi pivot joint  228  such as a ball and socket joint, and the arm  226  is coupled to the base  222  via a second multi pivot joint  230  such as a ball and socket joint. Each of the joints  228  and  230  includes retention features for holding various positions and angles. Generally speaking, this arrangement allows the platform  224  to yaw, pitch and roll as well as to translate in x, y and z. The user can therefore adjust the position of the platform  224  to the best position for use. As shown, the portable electronic device  14  is configured to be attached to the platform  224 , i.e., the portable electronic device plugs into the platform. 
     While this invention has been described in terms of several preferred embodiments, there are alterations, permutations, and equivalents, which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and apparatuses of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.