Patent Publication Number: US-2010123676-A1

Title: Dual input keypad for a portable electronic device

Description:
TECHNICAL FIELD OF THE INVENTION 
     The technology of the present disclosure relates generally to an input device for a portable electronic device such as a mobile telephone, and more particularly to a dual input keypad for a portable electronic device. 
     DESCRIPTION OF THE RELATED ART 
     Portable electronic devices, such as mobile telephones, media players, personal digital assistants (PDAs), and others, are ever increasing in popularity. To avoid having to carry multiple devices, portable electronic devices are now being configured to provide a wide variety of functions. For example, a mobile telephone may no longer be used simply to make and receive telephone calls. A mobile telephone may also be a camera, an Internet browser for accessing news and information, an audiovisual media player, a messaging device (text, audio, and/or visual messages), a gaming device, a personal organizer, and have other functions as well. 
     Even with the increase of functionality, the physical size of portable electronic devices has been shrinking to provide better portability. It is desirable, therefore, to accommodate numerous and various user inputs within the small space of a portable electronic device, while maintaining broad functionality and usability. For example, it is not uncommon for a user to desire a full “QWERTY” keyboard, navigational inputs, dedicated function inputs, and others all spaced within the confines of a portable electronic device in a user friendly manner. Touch-sensitive screens also have been used as an alternative or supplement to key button input devices. Similar to the above, the small screen sizes common of the displays of portable electronic devices may limit the usefulness of a touch screen. 
     Keypad inputs may include tactile inputs by which a user physically presses an input item, such as a key or button. Capacitive sensitive input devices are known in the art and have been used in attempts enhance the ease of use of input devices. Capacitive input devices may be equipped with electronic capacitive sensors, which can sense when a finger, stylus, or other input instrument is proximate to or touches an input key or button. This permits the user to apply an input with a “capacitive touch”, which does not require an actual tactile press of a button. Capacitive and tactile inputs, however, still have not been used to their full potential to provide broad functionality in a user friendly format within the confines of a portable electronic device. 
     SUMMARY 
     To improve the consumer experience with portable electronic devices, there is a need in the art for an improved input device that overcomes the difficulties associated with the small size, but large functionality, of portable electronic devices. Exemplary embodiments of the present invention combine the use of capacitive or other proximate sensors with tactile sensors in a manner that improves over prior input devices. 
     The input device may be a keypad input device in which at least some of the keys are dual-input keys. Of the potential dual inputs, one input is a capacitive input that may sense a finger, stylus, or other instrument proximate to or touching the key. The other input is a tactile input that responds to physical pressing of the key. The capacitive inputs typically may be used for navigation type functions, such as scrolling, zooming, moving a cursor or pointer, and the like. The tactile inputs may be employed for inputs typically associated with a particular input key. Such inputs may include character entry (numerical, text, symbols, etc), key-dedicated functional inputs (e.g., a call “send” key or other dedicated command), and the like. In one embodiment, a user may manually select either a tactile input mode or a capacitive input mode depending upon what type of inputs the user desires to make. In another embodiment, the device may have an auto mode that automatically selects the capacitive or tactile input mode based on the functional or operational state of the device, or based on the nature or a characteristic of the input. When a dual input key receives an input, the input is executed as a capacitive input or tactile input as is commensurate with the determined or selected input mode. 
     Therefore, according to one aspect of the invention, an input device for use in an electronic device comprises a plurality of keys, wherein at least a portion of the plurality of keys are dual input keys that include a proximate sensor for receiving a proximate input and a tactile sensor for receiving a tactile input. A controller is configured to determine an input mode, wherein the input mode is either a proximate input mode or a tactile input mode, and is configured to execute a user input to one of the dual input keys as either a tactile input or a proximate input as commensurate with the determined input mode. 
     According to one embodiment of the input device, the dual input keys form a continuous proximate input zone on the input device. 
     According to one embodiment of the input device, the continuous proximate input zone has a V-shape. 
     According to one embodiment of the input device, the proximate sensor of each of the dual-input keys is a capacitive sensor for receiving a capacitive input. 
     According to one embodiment of the input device, the plurality of keys are keypad buttons. 
     According to one embodiment of the input device, the plurality of keys are touch screen surfaces. 
     According to one embodiment of the input device, the electronic device is operable in a plurality of device states, and the controller is further configured to determine the device state and set the input mode as the proximate input mode or the tactile input mode based upon the determined device state. 
     According to one embodiment of the input device, the controller is configured to determine the input mode as the proximate input mode or the tactile input mode based upon a characteristic of the user input. 
     According to one embodiment of the input device, the controller is configured to set the input mode to the tactile input mode when a dual input key is pressed within a specified time delay from the detection of a proximate input to the dual input key. 
     According to one embodiment of the input device, the controller is configured to set the input mode to the proximate input mode when a dual input key is not pressed within the time delay after the detection of a proximate input. 
     According to one embodiment of the input device, the controller is configured to receive a user input corresponding to a selection of an input mode, and is configured to set the input mode to either the tactile input mode or the proximate input mode as is commensurate with the user selected input mode. 
     Another aspect of the invention is a method of employing an input device for use in an electronic device, wherein the input device includes a plurality of keys and at least a portion of the plurality of keys are dual input keys for receiving a proximate input and a tactile input. The method comprises the steps of receiving an input to one of the dual input keys, determining an input mode, wherein the input mode is either a proximate input mode or a tactile input mode, and executing the input as either a proximate input or a tactile input as is commensurate with the determined input mode. 
     According to one embodiment of the method, the proximate input is a capacitive input. 
     According to one embodiment of the method, the determining step comprises receiving a user input corresponding to a selection of either the proximate input mode or the tactile input mode, and the input is executed as either a proximate input or a tactile input as is commensurate with the user selected input mode. 
     According to one embodiment of the method, the determining step comprises automatically determining the input mode. 
     According to one embodiment of the method, the determining step comprises determining a device state of the electronic device and deciding whether the device state is a proximate input state or a tactile input state, and the input mode is set as either the proximate input mode or the tactile input mode as is commensurate with the state of the electronic device. 
     According to one embodiment of the method, the determining step comprises determining a characteristic of the input and deciding whether the characteristic of the input is associated with a proximate input or a tactile input, and the input mode is set to either the proximate input mode or the tactile input mode as is commensurate with the characteristic of the input. 
     According to one embodiment of the method, the determining step further comprises measuring a time delay from a detection of the input, and the input mode is set to the tactile input mode when a dual input key is pressed within the time delay. 
     According to one embodiment of the method, the determining step further comprises setting the input mode to the proximate input mode when a dual input key is not pressed within the time delay from the detection of the input. 
     According to one embodiment of the method, the proximate input is a navigational input and the tactile input is at least one of a character input or a dedicated key command. 
     These and further features of the present invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the invention may be employed, but it is understood that the invention is not limited correspondingly in scope. Rather, the invention includes all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto. 
     Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments. 
     It should be emphasized that the terms “comprises” and “comprising,” when used in this specification, are taken to specify the presence of stated features, integers, steps or components but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a mobile telephone as an exemplary electronic device for use in accordance with an embodiment of the present invention. 
         FIG. 2  is a schematic block diagram of operative portions of the mobile telephone of  FIG. 1 . 
         FIG. 3  is a schematic view of an exemplary dual-input key that may be used as part of an input device in the mobile telephone of  FIG. 1 . 
         FIG. 4  is a flowchart depicting an exemplary method of employing an input device in accordance with an embodiment of the present invention. 
         FIG. 5  is a flowchart depicting an exemplary method by which an electronic device controller may determine an input mode for executing inputs to an input device. 
         FIG. 6  is a schematic diagram of an exemplary input device for use in accordance with an embodiment of the present invention. 
         FIG. 7  is a schematic diagram of a communications system in which the mobile telephone of  FIG. 1  may operate. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Exemplary embodiments of the present invention provide for an improved input device for a portable electronic device. The input device is user friendly despite accommodating the small size of a portable electronic device, while still permitting broad functionality. 
     The input device may be a keypad input device in which at least a portion of the keys are dual-input keys. Although the invention is described with respect to an exemplary embodiment in which the input device uses keypad buttons, other input devices may be employed. For example, the input device may include keys that are flat touchpad surfaces, or the input device may include keys provided on a touch screen surface. Of the dual inputs, one input is a proximate input, such as a capacitive input, that may sense a finger, stylus, or other instrument proximate to or touching the key. The other input is a tactile input that responds to physical pressing of the key. 
     As further described below, the capacitive inputs typically may be used for navigation type functions, such as scrolling, zooming, moving a cursor or pointer, and the like. The tactile inputs may be employed for inputs typically associated with a particular input key. Such inputs may include character entry (numerical, text, symbols, etc), key-dedicated functional inputs (e.g., a call “send” key or other key command), and the like. In one embodiment, a user may manually select either a tactile input mode or capacitive input mode depending upon what type of inputs the user intends to make. In another embodiment, the device may have an “auto mode” that automatically selects the capacitive or tactile input mode based on the functional or operational state of the device, or based upon the nature or a characteristic of a user input. 
     Embodiments of the present invention will now be described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. It will be understood that the figures are not necessarily to scale. 
     The following description is made in the context of a conventional mobile telephone. It will be appreciated that the invention is not intended to be limited to the context of a mobile telephone and may relate to any type of appropriate electronic device, examples of which include a media player, a gaming device, or a desktop or laptop computer. Other devices may include various forms of portable radio communication equipment or mobile radio terminal, such as mobile telephones, pagers, communicators, electronic organizers, personal digital assistants (PDAs), smartphones, and any portable communication apparatus or the like. 
       FIG. 1  depicts an exemplary mobile telephone  10 , and  FIG. 2  represents a functional block diagram of operative portions of the mobile telephone  10 . Mobile telephone  10  may be a clamshell phone with a flip-open cover  15  movable between an open and a closed position. In  FIG. 1 , the cover is shown in the open position. It will be appreciated that mobile telephone  10  may have other configurations, such as a “block” or “brick” configuration, slide cover configuration, swivel cover configuration, or others. 
     The mobile telephone  10  may include an input device application  43  for carrying out the features of the invention. Application  43  may be embodied as executable program code that is resident in and executed by the mobile telephone  10 . The mobile telephone  10  may include a controller that executes the program code stored on a computer or machine-readable medium. The controller may include a control circuit  41  and/or a processing device  42 . The program may be a stand-alone software application or form a part of a software application that carries out additional tasks related to the mobile telephone  10 . It will be apparent to a person having ordinary skill in the art of computer programming, and specifically in application programming for cameras, mobile telephones or other electronic devices, how to program a mobile telephone to operate and carry out logical functions associated with application  43 . Accordingly, details as to specific programming code have been left out for the sake of brevity. Also, while the code may be executed by control circuit  41  in accordance with an exemplary embodiment, such controller functionality could also be carried out via dedicated hardware, firmware, software, or combinations thereof, without departing from the scope of the invention. 
     A keypad  18  provides for a variety of user input operations. For example, keypad  18  typically includes alphanumeric keys  16  in the form of keypad buttons for allowing entry of alphanumeric information such as telephone numbers, phone lists, contact information, notes, etc. In addition, keypad  18  typically includes special function keys such as a “send” key for initiating or answering a call. Special function keys also may include menu navigation and select keys to facilitate navigating through a menu displayed on a display  14 . For example, mobile telephone  10  may include functional keys that each correspond to a different function of the mobile telephone. In this example, the keypad includes a full “QWERTY” style keyboard and a variety of function keys, examples of which are labeled as  16   a - d . For example, mobile telephone  10  may have functional key buttons to activate a camera, email function, web browser, media player, or others. It will be appreciated that alternative or additional functional keys may be employed. In addition, functional keys may be preset by the manufacturer, or programmed by the user as is conventional. Mobile telephone  10  also may include a five-way navigational surface  17 , which may perform a variety of navigational and input functions. In addition or alternatively to keypad buttons, some or all of the keys may be flat touch pad surfaces, or may be used in conjunction with the display as soft keys. Keys or key-like functionality also may be embodied as a touch screen associated with the display  14 . 
     As shown in  FIG. 2 , mobile telephone  10  also may include capacitive sensors  20  associated with at least a portion of the keys of the keypad  18 . The capacitive sensors  20  are in communication with the keypad  18 . When a user places a finger, stylus, or other input instrument near a key on keypad  18 , the capacitive sensors sense the presence of the finger/input instrument. In one embodiment, the capacitive sensors are activated when the finger/input instrument is placed in close proximity to a key button. The capacitive sensors thus may be short-range sensors configured to have the sensitivity to distinguish the precise key button about which a finger/input instrument is near. In another embodiment, the capacitive sensors may be activated when a finger/input instrument touches (but does not press) a given key button. 
     Although the use of capacitive sensors is described as an exemplary embodiment, other short-range or touch sensors may be employed. All sensors of this type are referred to herein collectively as “proximate sensors”. Proximate sensors are sensors that may detect when a finger, stylus, or other input instrument is proximate to or touching, but not pressing, a keypad button, which commensurately may be referred to herein as a “proximate input”. In addition to capacitive sensors, other examples of proximate sensors may include magnetic or inductive sensors. 
     Mobile telephone  10  also may include tactile sensors  22  associated with at least a portion of the keys of the keypad  18 . The tactile sensors sense when a tactile input is applied, such as by pressing (and not merely touching) a key on keypad  18 . 
       FIG. 3  depicts an exemplary dual-input key  16  that may be used as a button on keypad  18 . The key  16  may include a button surface  32  that the user may touch, press, or otherwise deliver a proximate or tactile input with a finger, stylus, or other input instrument. As one of the dual inputs, the key button surface  32  may be associated with one of the capacitive sensors  20  that includes capacitive circuitry  30 . The capacitive circuitry  30  may detect a change in capacitance when a finger or other input instrument is near or touches the button surface  32 , thereby producing a proximate or capacitive input. 
     As the second of the dual inputs, button surface  32  also may be associated with a tactile sensor  22 . When the key is pressed, the button surface  32  depresses a conductive surface  34  made of a conductive material as is known in the art. When depressed, the conductive surface  34  meets electrical contact  36  mounted on a circuit board  38 . Electrical leads  40  complete a circuit to create an electrical input in response to a tactile press of the key  16 . 
     It will be appreciated that whether a capacitive input or tactile input is preferable may depend upon the mode or operational state of the device. For example, a capacitive input may be preferred for navigation type operations, such as scrolling through a menu list, a series of icons, content that extends beyond the physical screen, or the like. In contrast, tactile inputs may be preferred for entering data, such as, for example, telephone numbers or text messages, or for entering dedicated input commands, such as, for example, pressing a “send” key to initiate a call. Described below are exemplary embodiments for discerning between a capacitive or other proximate input mode, versus a tactile or pressing input mode. 
     Referring again to  FIG. 1 , in one exemplary embodiment, the mobile telephone  10  has one or more capacitive or proximate input zones  68 , as represented by the shaded regions in the figure. The capacitive zones  68  may include a plurality of key capacitive sensors  22  that are linked or otherwise in communication with one another. In this manner, a continuous proximate input zone is provided by which a user may enter a variety of navigational inputs. For example, if a user wants to scroll along a menu or other display items, the user may run a finger or input instrument along one or more of the proximate input zones. A similar operation may be used to employ other navigational inputs, such as controlling a cursor in a “mouse” type function, moving an object on screen, moving the viewing window of the display to navigate to virtual regions off-screen, zooming in and out, and others. Regardless of the particular operation, the navigation may be in the direction of the motion of the user. For example, to scroll downward, a user may run a finger or input instrument downward along one of the proximate input zones  68 . 
     As another example, different capacitive or proximate input zones may be provided with different navigational functions or directional commands. For example, in  FIG. 1  the left navigational zone may be used to scroll up and down, while the right navigational zone may be used to scroll right and left. Similarly, the left navigational zone may be used to move an object, while the right navigational zone may be used to zoom in and out. Other various configurations may be employed, and the configurations may be set at the time of manufacture and/or altered or defined by the user as is conventional for defining user settings in a portable electronic device. In addition, different configurations may be selected automatically or by the user depending on the operational mode or state of the device. 
     In the example of  FIG. 1 , the proximate input zones  68  each have a V-shape that is particularly suited for a portable electronic device. This V-shaped configuration may be referred to herein as a “V-Pad”. Specifically, when a user grips the device, the user&#39;s thumbs may conveniently rest about the proximate input zones  68 . It will be appreciated, however, that the precise shape, physical configuration, functional configuration, and other characteristics of the keypad  18  (keys  16  and zones  68 ) may be varied. In addition, although as an exemplary embodiment the proximate input zones may receive capacitive inputs, it will be appreciated that more broadly the zones  68  may receive proximate inputs based on any suitable technology as described above. 
     In the example of  FIG. 1 , the keys  16  of keypad  18  are configured to form a conventional “QWERTY” style keyboard. Each key  16 , whether part of the QWERTY keyboard and/or any special function keys, may receive a tactile input from a user by virtue of a user pressing on the key with a finger or input instrument. It will be appreciated that other styles or configurations of tactile keys or keyboards may be employed. 
     As shown in  FIG. 1 , to conserve space on the portable electronic device  10 , the proximate input zones  68  are provided in overlapping fashion with the keys  16  such that at least a portion of the keys are dual input keys. Although such a configuration conserves space, an issue arises from the fact that many of the keys  16  may be operable by both a capacitive input (or other proximate input) and a tactile input. In one embodiment, a user may select a tactile input mode in which only tactile inputs may be received by one or more of the keys  16 , or alternatively a user may select a capacitive or proximate input mode in which only capacitive (or other proximate) inputs may be received by one or more of the keys  16 . A tactile or capacitive input mode may be selected from a menu, with a dedicated key input, or by any conventional means. Relatedly, a user may select a setting by which one of the modes become a default mode when the device is initially powered on. 
     In one embodiment, the input device application  43  may include an “auto mode” feature. It will be appreciated that the electronic device  10 , as is common, is operable in a plurality of functional modes or device states. In one embodiment of the auto mode, the application  43  may automatically determine an input mode, either a proximate input mode or tactile input mode, based upon a functional mode or operational state of the device. In another embodiment of the auto mode, the input mode may be determined automatically based on a characteristic of a user input. Once the input mode is determined, user inputs to a dual input key may be executed as either a proximate input or a tactile input as is commensurate with the determined input mode. 
     For example, suppose a user enters a calling mode by any conventional means. Upon first entering the calling mode, a user typically would next select a dedicated key input. For example, a user may wish to input a numerical series corresponding to a telephone number, or type in a character set corresponding to a name of a contact. The application  43 , therefore, would automatically set the input mode of the keypad  18  to a tactile input mode, as the receipt of one or more tactile inputs may be probable. A user, however, may not enter a number or character as a tactile input. For example, a user may provide a dedicated key input for the opening of a contact list. Once the contact list is open, the application  43  may sense that a navigation input may be more appropriate, such as scrolling through the contact list. Application  43 , therefore, would automatically set the input mode of the keypad  18  to a proximate input mode, as the receipt of one or more proximate inputs may be probable. In various exemplary embodiments, the application  43  may determine whether a tactile or capacitive (proximate) input mode is more appropriate, and commensurately cause the execution of inputs to dual input keys as proximate or tactile inputs based on the determined input mode. 
     The input device may distinguish between tactile and proximate inputs in other ways as well. For example, a user may manually override the auto mode and manually select either the tactile input or proximate input mode. As another example, certain keys may be capable of only a tactile or proximate input. Referring to the above calling example and  FIG. 1 , suppose again that the user has opened a contact list. The application may select a capacitive input mode as to keys within the zones  68 . Inputs to these zones, therefore, may be sensed as capacitive inputs to permit the user to scroll through the various contacts. However, in this example, the center button of key navigational ring  17 , and/or a “send” key such as the key  16   a , may not be capable of a capacitive input being outside of zones  68 . A user, therefore, may scroll to the desired contact using zones  68  and then press the center button to select the contact, and/or the send key to initiate the call. Different input capabilities of the various keys, therefore, may enhance the ability of the input device to distinguish between capacitive and tactile inputs. 
     For keys having the dual-input capability, such as the keys in zone  68 , application  43  also may determine the device setting as the proximate input mode or the tactile input mode based on the nature or a characteristic of a user input. For example, as a user places a finger or input instrument proximate to a given key in one of the zones  68 , a capacitive or proximate input may first be sensed as the finger or input instrument draws near and touches the key. A time delay function may then be initiated. For example, the electronic device  10  may include a timer  60  for measuring a time delay from the detection of a proximate input to a dual input key. When a tactile input is received within the predetermined time delay, i.e., the user actually presses the key, application  43  may set the device to the tactile input mode insofar as the user pressed the key. Tactile inputs may then be executed. 
     When, however, no tactile input is received within the predetermined time delay after a proximate input is sensed, application  43  may set the device to the capacitive (proximate) input mode. The proximate input mode may be set for the single key, or alternatively may be set for all the dual input keys within the zones  68  to presume a series of capacitive inputs is likely to follow the initial capacitive input. This presumption is based on the likelihood that typical navigation functions may be performed by moving the input instrument over a plurality of keys with the capacitive input capability. In exemplary embodiments, the initial predetermined time delay may be from one millisecond to one second. It will be appreciated that alternative ways to distinguish between capacitive and tactile inputs may be employed. 
     In accordance with the above,  FIG. 4  depicts an exemplary method of employing an input device in accordance with an embodiment of the present invention. Although the exemplary method is described as a specific order of executing functional logic steps, the order of executing the steps may be changed relative to the order described. Also, two or more steps described in succession may be executed concurrently or with partial concurrence. It is understood that all such variations are within the scope of the present invention. 
     At step  100 , mobile telephone  10  may be present in an initial state. The initial state may be, for example, any functional or operation mode or state of the device. At step  110 , the input device may detect a pending or potential input. For example, as a finger, stylus, or input instrument comes in contact with or proximate to the input device, a pending input may be detected. It will be appreciated that at this stage, it is unknown whether the input is intended to be a capacitive input (or other proximate input) or a tactile input. Accordingly, at steps  120  and  130  the electronic device controller, such as via the execution of application  43 , may determine and set the input mode of the input device. As described above, the input mode may be either a proximate input mode in which a proximate input, such as a capacitive input, may be received. Alternatively, the input mode may be a tactile input mode in which a tactile input may be received. If at step  130  the input mode is set to be the tactile input mode, at step  140  tactile inputs may be executed. If, however, at step  130  the input mode is set to be the proximate input mode, at step  150  proximate inputs may be executed. 
     The manner by which the controller of the electronic device may determine the input mode (tactile or proximate/capacitive) will now be depicted in greater detail than in  FIG. 4 .  FIG. 5  depicts an exemplary method by which the controller of the electronic device may determine the input mode for executing inputs to the input device. Although the exemplary method is described as a specific order of executing functional logic steps, the order of executing the steps may be changed relative to the order described. Also, two or more steps described in succession may be executed concurrently or with partial concurrence. It is understood that all such variations are within the scope of the present invention. 
     The method may begin at step  110  from  FIG. 4 , at which a pending input may be detected. At step  200 , the controller may first determine whether the electronic device has entered a manual selection mode in which a user may select the input mode. A user may enter a manual selection mode by selection from a menu, a dedicated key input, as a default setting, or by any conventional means. If the manual selection mode has been entered, at step  210  the controller may receive a manual selection of an input mode, which, as depicted in step  220 , may be the selection of either a tactile input or proximate input mode. Again, a user may select the input mode by any conventional means. If at step  220  the user has selected a tactile input mode, at step  230  tactile inputs may be executed. If, however, at step  220  the user has selected a proximate input mode, at step  240  proximate inputs may be executed. 
     Referring back to step  200 , if at step  200  it is determined that a manual selection mode has not been entered, the method may proceed to step  250  at which an “auto mode” is entered. As stated above, an auto mode is a mode in which it is determined automatically whether the input device (keypad  18 ) is to be set to a tactile input mode or a proximate/capacitive input mode. At step  260 , a determination may be made as to which of two auto modes described above may be employed. One such mode is a device state mode, in which whether the input mode will be set as the tactile input mode or the proximate/capacitive input mode may be based upon the functional or operational state of the device. An alternative auto mode may be an input detection mode, in which whether the input mode will be set as the tactile input mode or proximate/capacitive input mode may be based upon the nature or a characteristic of the user input. 
     If at step  260  the controller is set to an input detection mode, the method may proceed to steps  265  and  270  at which a determination may be made as to whether the input characteristic is indicative of a proximate input mode or a tactile input mode. As stated above, such a determination may be made based upon the physical characteristics of an input, such as, for example, whether or not placing an input instrument near a key is followed by a tactile input within a given time delay period. The determination may also be based upon the capabilities of a key, such as, for example, whether a key is capable of only a particular category of input (tactile versus proximate/capacitive). If at step  270  it is determined that a tactile input mode is detected, at step  275  tactile inputs may be executed. If, however, at step  270  it is determined that a capacitive or other proximate input mode is detected, at step  280  proximate inputs may be executed. 
     Referring back to step  260 , if the controller is set to a device state mode, the method may proceed to steps  285  and  290  at which a determination may be made as to whether the device state is more likely associated with proximate inputs or tactile inputs. As stated above, such a determination may be made based upon, for example, whether the device state typically would be associated with navigational type inputs, which are more inclined toward proximate inputs, or whether the device state typically would be associated with singular or dedicated inputs (such as inputting characters or dedicated key commands), which are more inclined toward tactile inputs. If at step  290  it is determined that a tactile device state is detected, at step  295  tactile inputs may be executed. If, however, at step  290  it is determined that a capacitive or other proximate device state is detected, at step  300  proximate inputs may be executed. 
     In the above examples, the two auto modes—input detection and device state—have been described as distinct or separate modes of operation. It will be appreciated, however, that both auto modes may operate wholly or partly in tandem. For example, application  43  may consider both the device state and a characteristic of the input when determining whether the input mode is to be set as either the proximate input mode or the tactile input mode. 
     Although the input device of the present invention has been described with reference to a QWERTY style keyboard on a portable electronic device, it will be appreciated that comparable principles may be applied to other keyboard styles having other key configurations. For example,  FIG. 6  depicts an example of a keyboard  70  having a configuration of keys  72  that may be typical of electronic devices such as laptop or desktop computers. The keyboard  70  includes zones  78 , indicated in the figure by the shaded regions, that may provide capacitive or proximate input capabilities for a portion of the keys  72 . The zones  78  include connective paths  79  for placing keys within zones  78  in signal communication with one another, such that the zones  78  form continuous proximate input zones. As seen in the figure, the regions  78  are provided in a V-Pad style configuration similar to the V-Pad configuration that may be employed in a portable electronic device. It will be appreciate, however, that the configuration of the zones  78  may be varied. The zones  78  may be considered comparable in function and operation to the zones  68  described with respect to the above embodiments in connection with a portable electronic device. In this manner, the dual input functionality described herein may be incorporated into essentially any keyboard, key configuration, or comparable input device. 
     Accordingly, with the described systems and methods, an improved input device is provided. The input device provides for overlapping capacitive and tactile functionality for at least a portion of the keys of the input device, thereby permitting the input device to be accommodated within the small dimensions typical of portable electronic devices. Broad functionality is not compromised. 
     Additional features of the mobile telephone  10  will now be described. For the sake of brevity, generally conventional features of the mobile telephone  10  will not be described in great detail herein. 
     Referring again to  FIG. 2 , the mobile telephone  10  includes call circuitry that enables the mobile telephone  10  to establish a call and/or exchange signals with a called/calling device, typically another mobile telephone or landline telephone, or another electronic device. The mobile telephone  10  also may be configured to transmit, receive, and/or process data such as text messages (e.g., colloquially referred to by some as “an SMS,” which stands for simple message service), electronic mail messages, multimedia messages (e.g., colloquially referred to by some as “an MMS,” which stands for multimedia message service), image files, video files, audio files, ring tones, streaming audio, streaming video, data feeds (including podcasts) and so forth. Processing such data may include storing the data in a memory  45 , executing applications to allow user interaction with data, displaying video and/or image content associated with the data, outputting audio sounds associated with the data and so forth. 
     The mobile telephone  10  may include an antenna  44  coupled to a radio circuit  46 . The radio circuit  46  includes a radio frequency transmitter and receiver for transmitting and receiving signals via the antenna  44  as is conventional. The mobile telephone  10  further includes a sound signal processing circuit  48  for processing audio signals transmitted by and received from the radio circuit  46 . Coupled to the sound processing circuit  48  are a speaker  50  and microphone  52  that enable a user to listen and speak via the mobile telephone  10  as is conventional. 
     Mobile telephone  10  has a display  14  viewable when the clamshell telephone is in the open position. The display  14  displays information to a user regarding the various features and operating state of the mobile telephone  10 , and displays visual content received by the mobile telephone  10  and/or retrieved from a memory  45  ( FIG. 2 ). Also, the display  14  may be used as an electronic viewfinder for a camera assembly  62 . The display  14  may be coupled to the control circuit  41  by a video processing circuit  54  that converts video data to a video signal used to drive the various displays. The video processing circuit  54  may include any appropriate buffers, decoders, video data processors and so forth. The video data may be generated by the control circuit  41 , retrieved from a video file that is stored in the memory  45 , derived from an incoming video data stream received by the radio circuit  48 , played by a media player  63 , or obtained by any other suitable method. 
     The mobile telephone  10  also may include a local wireless interface  66 , such as an infrared transceiver and/or an RF adaptor (e.g., a Bluetooth adapter), for establishing communication with an accessory, another mobile radio terminal, a computer or another device. For example, the local wireless interface  66  may operatively couple the mobile telephone  10  to a headset assembly (e.g., a PHF device) in an embodiment where the headset assembly has a corresponding wireless interface. 
     The mobile telephone  10  also may include an I/O interface  56  that permits connection to a variety of I/O conventional I/O devices. One such device is a power charger that can be used to charge an internal power supply unit (PSU)  58 . 
     With additional reference to  FIG. 7 , the mobile telephone  10  may be configured to operate as part of a communications system  80 . The system  80  may include a communications network  81  having a server  82  (or servers) for managing calls placed by and destined to the mobile telephone  10 , transmitting data to the mobile telephone  10  and carrying out any other support functions. The server  82  communicates with the mobile telephone  10  via a transmission medium. The transmission medium may be any appropriate device or assembly, including, for example, a communications tower (e.g., a cell tower), another mobile telephone, a wireless access point, a satellite, etc. Portions of the network may include wireless transmission pathways. The network  81  may support the communications activity of multiple mobile telephones  10  and other types of end user devices. As will be appreciated, the server  82  may be configured as a typical computer system used to carry out server functions and may include a processor configured to execute software containing logical instructions that embody the functions of the server  82  and a memory to store such software. 
     Although the invention has been shown and described with respect to certain preferred embodiments, it is understood that equivalents and modifications will occur to others skilled in the art upon the reading and understanding of the specification. The present invention includes all such equivalents and modifications, and is limited only by the scope of the following claims.