Patent Publication Number: US-11036282-B2

Title: Proximity detector in handheld device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 14/080,116 (U.S. Patent Publication No. 2014-0074426), filed Nov. 14, 2013, which is a continuation of U.S. application Ser. No. 13/766,570 (now U.S. Pat. No. 8,612,856), filed Feb. 13, 2013, which is a continuation of U.S. application Ser. No. 11/240,788 (now U.S. Pat. No. 8,381,135), filed Sep. 30, 2005, which is a Continuation-in-Part of U.S. patent application Ser. No. 10/903,964 (now U.S. Pat. No. 8,479,122), filed Jul. 30, 2004, and is a Continuation-in-Part of U.S. patent application Ser. No. 11/038,590 (now U.S. Pat. No. 8,239,784), filed Jan. 18, 2005, and is a Continuation-in-Part of U.S. patent application Ser. No. 10/927,925 (now U.S. Pat. No. 7,760,187), filed Aug. 26, 2004, and is a continuation of U.S. patent application Ser. No. 11/165,958 (now U.S. Pat. No. 7,599,044), filed Jun. 23, 2005, all of which are herein incorporated by reference. 
     This application is also related to U.S. Pat. No. 6,583,676, titled “PROXIMITY/TOUCH DETECTOR AND CALIBRATION CIRCUIT,” issued Jun. 24, 2003; U.S. Pat. No. 7,663,607, titled “MULTIPOINT TOUCHSCREEN,” issued Feb. 16, 2010; and U.S. Pat. No. 7,653,883, titled “PROXIMITY DETECTOR IN HANDHELD DEVICE,” issued Jan. 26, 2010, all of which are herein incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to I/O platforms including proximity detection as a means for providing inputs. More particularly, the invention relates to improved methods and devices for operating a portable electronic device that utilizes proximity detection. 
     2. Description of the Related Art 
     There exist today many styles of input devices for performing operations in an electronic system. The operations generally correspond to moving a cursor and making selections on a display screen. By way of example, the input devices may include buttons, switches, keyboards, mice, trackballs, touch pads, joy sticks, touch screens and the like. Each of these devices has advantages and disadvantages that are taken into account when designing the electronic system. 
     Although devices such as these work well, there are continuing efforts to improve their form, feel and functionality. An improved input means and operational methods associated therewith is therefore desired. 
     SUMMARY OF THE INVENTION 
     The invention relates, in another embodiment, to a method for initiating floating controls on an electronic device. The method includes detecting the presence of an object above and spaced away from a surface of the electronic device. The method also includes displaying a particular graphical user interface element on a display of the electronic device when the object is detected above the surface of the electronic device. 
     The invention relates, in another embodiment, to a user interface method. The method includes detecting an object in space. The method also includes determining a user interface mode when an object is detected in space. The method further includes displaying and enabling one or more GUI elements based on the user interface mode. 
     The invention relates, in another embodiment, to a method for scrolling through media items. The method includes displaying a plurality of media items at a surface. The method also includes detecting an object spaced away from the surface and over at least one of the media items that are displayed. The method further includes activating a virtual scroll wheel when the object is detected over the displayed media items. The method additionally includes detecting a touch on the surface and over the virtual scroll wheel. The method also includes determining if a touch event is performed on the surface and over the virtual scroll wheel. Moreover, the method includes scrolling through the group of media items when a scrolling touch event is performed. 
     The invention relates, in another embodiment, to a computer implemented method. The method includes presenting graphical information on a display having a display surface. The method also includes detecting an object in space above display surface and over the display. The method further includes expanding an area of the graphical information proximate the location of the object when the object is detected in space above display surface and over the display. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention may best be understood by reference to the following description taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a diagram of an I/O platform, in accordance with one embodiment of the present invention. 
         FIG. 2  is a diagram of an I/O platform, in accordance with one embodiment of the present invention. 
         FIG. 3  is a diagram of an I/O platform, in accordance with one embodiment of the present invention. 
         FIG. 4  is a diagram of a method of operating an I/O platform, in accordance with one embodiment of the present invention. 
         FIG. 5  is a simplified side elevation view of a portable computing device, in accordance with one embodiment of the present invention. 
         FIG. 6  is a diagram of a proximity based method, in accordance with one embodiment of the present invention. 
         FIG. 7  is a diagram of a method of operating an electronic device, in accordance with one embodiment of the present invention. 
         FIG. 8  is a diagram of a proximity method of operating an electronic device, in accordance with one embodiment of the present invention. 
         FIG. 9  is a diagram of a touch method, in accordance with one embodiment of the present invention. 
         FIG. 10  is user interface method, in accordance with one embodiment of the present invention. 
         FIG. 11  is a determination method, in accordance with one embodiment of the present invention. 
         FIG. 12  is a user interface method, in accordance with one embodiment of the present invention. 
         FIG. 13A-13F  illustrates a sequence associated with the method shown in  FIG. 12 , in accordance with one embodiment of the present invention. 
         FIG. 14A-14F  illustrates a sequence associated with the method shown in  FIG. 12 , in accordance with one embodiment of the present invention. 
         FIGS. 15A-15C  illustrate a user interface sequence, in accordance with one embodiment of the present invention. 
         FIG. 16  is a user interface method, in accordance with one embodiment of the present invention. 
         FIGS. 17A-17J  illustrate a user interface sequence, in accordance with one embodiment of the present invention. 
         FIG. 18  is a diagram of a GUI operational method, in accordance with one embodiment of the present invention. 
         FIGS. 19A-19D  illustrate a zooming target sequence using the GUI operational method, in accordance with one embodiment of the present invention. 
         FIG. 20  is an expansion method, in accordance with one embodiment of the present invention. 
         FIG. 21  is a proximity method, in accordance with one embodiment of the present invention. 
         FIG. 22  is a proximity gesture method, in accordance with one embodiment of the present invention. 
         FIG. 23  is a block diagram of an exemplary computer system, in accordance with one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of this aspect of the invention are discussed below with reference to  FIGS. 1-23 . 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 block diagram of an I/O platform  10 , in accordance with one embodiment of the present invention. The I/O platform  10  may be embodied as a peripheral stand alone device or it may be integrated into an electronic system or device. In either case, the I/O platform  10  is configured to control inputs and/or outputs associated with the host system or device. Examples of peripheral stand alone devices include mice, keyboards, joysticks, remote controls, etc. Examples of electronic devices include any consumer related electronic device such as computers, media players, telephones, etc. 
     The I/O platform  10  includes an I/O surface  12  having one or more input and/or output devices  14 . The input devices  14 A may for example be selected from buttons, switches, dials, sliders, keys or keypads, navigation pads, touch pads, touch screens, and the like. The output devices  14 B may for example be selected from displays (e.g., LCD, CRT), speakers (or speaker jacks), indicators, and the like. The I/O devices  14  can be used solely or in any combination with other I/O devices  14  to form the desired I/O platform  10 . 
     The I/O platform  10  also includes a proximity detection system  16  configured to detect when a finger (or stylus) is in close proximity to (but not in contact with) the I/O surface  12 . The proximity detection system  16  may also detect location (e.g., x, y, z), direction, speed, orientation (e.g., roll, pitch, yaw), etc. of the finger relative to the I/O surface  12 . Generally speaking, the proximity detection system  16  provides additional inputs to the I/O platform  10  when the a finger is placed above the I/O surface  12  as for example when a finger is moving directly towards the I/O surface  12 , hovering just over the I/O surface  12  or possibly moving about but above the I/O surface  12 . The input signals can be used to initiate commands, make selections, and even control motion in a display (e.g., tracking). In some cases, the inputs provided by the proximity detection system  16  may even be used in conjunction with other inputs (provided by other input devices) to create new inputs, which have different meaning than when the two inputs are used by themselves. For example, when using a touch sensing device along with a proximity detection system, advanced gestures may be performed that combine proximity gestures along with touch gestures. 
     The proximity detection system  16  may be widely varied. For example, it may be based on sensing technologies including capacitive, electric field, inductive, hall effect, reed, eddy current, magneto resistive, optical shadow, optical visual light, optical IR, optical color recognition, ultrasonic, acoustic emission, radar, heat, sonar, conductive or resistive and the like. A few of these technologies will now be briefly described. 
     Capacitive proximity systems use capacitive sensing nodes to detect changes in capacitance above the I/O surface. Objects such as a finger affect the capacitance in a non trivial manner and therefore the changes can be used to determine whether the finger is present above the I/O surface. 
     Infrared proximity systems send out pulses of infrared light, and detect reflections of that light from nearby objects. The light may for example be reflected off of a finger located in front of the pulsed light. If the system detects reflected light, then an object is assumed to be present. If the system does not detect reflected light, then it is assumed that there is no object present. The light may be focused to a particular distance above the I/O surface. 
     Optical Shadow proximity systems use photodetectors or similar device to detect changes in light intensity. If the intensity is reduced, it can be assumed that this was caused by the presence of an object forming a shadow over the photodetector. 
     Ultrasonic proximity systems provide ultrasonic pulses of sound, and measures the length of time it takes for those pulses to hit nearby objects and return as echos. The greater the time, the further the object. 
     In most cases, the proximity detection system  16  includes one or more proximity sensors  18  that generate one or more sensing fields  19  above the I/O surface  12  and that in conjunction with a controller  20  produce signals when an object disturbs or intercepts the sensing field(s). Each sensing field typically generates its own signals when disturbed. In one embodiment, a single sensing field is used to cover the entire I/O surface. In another embodiment, a single sensing field only covers a portion of the I/O surface. For example, it can be configured to cover or surround a particular I/O device or a group of I/O devices. In another embodiment, multiple sensing fields are used to cover the entire I/O surface. For example a first sensing field may be configured to cover a first I/O device or a first group of I/O devices and a second sensing field may be configured to cover a second I/O device or a second group of I/O devices. Any number of sensing fields may be used. In some cases, in order to perform tracking, the sensing fields may even be distributed as a pixilated array of nodes. In yet another embodiment, multiple sensing fields are used to only cover a portion of the I/O surface. Alternatively or additionally, the sensing fields may be configured to cover areas that do not include I/O devices as for example housing components that support the I/O platform  10 . 
     Although the I/O surface  12  can be widely varied, several embodiments will now be discussed. It should be appreciated that these embodiments are not limitations and that they serve as examples to the infinite number of combinations that can be created when designing an I/O surface  12 . 
     In one embodiment, the I/O surface  12  includes an output device in the form of a display and input devices in the form of a touchpad and one or more buttons. By way of example, the display may be situated in an upper region of the I/O surface, and the touch pad and buttons may be situated in a lower region of the I/O surface just below the display. Any or all of these devices may include an all encompassing or regional sensing field  19  disposed around and/or above the devices. This type of I/O surface can typically be found on media players such as the iPod music players manufactured by Apple Computer of Cupertino, Calif. 
     In another embodiment, the I/O surface  12  includes an enlarged touch screen display, a navigation pad, and one or more buttons. By way of example, the enlarged display may be situated in an upper/middle region of the I/O surface  12 , and the navigation pad and buttons may be situated in a lower region of the I/O surface  12  just below the display. Any or all of these devices may include an all encompassing or regional sensing field  19  disposed around and/or above the devices. This type of I/O surface can typically be found on personal digital assistants (PDAs). 
     In another embodiment, the I/O surface  12  includes a small display, navigation pad and a keypad. By way of example, the small display may be situated in an upper region of the I/O surface  12 , and the navigation pad and keypad may be situated in a lower/middle region of the I/O surface  12  just below the display. Any or all of these devices may include an all encompassing or regional sensing field  19  disposed around and/or above the devices. This type of I/O surface can typically be found on cellular phones. 
     In another embodiment, the I/O surface  12  only includes a touch screen display. That is, the entire I/O surface  12  is covered with a display with a touch screen disposed over the display. This type of I/O surface  12  can be found in multifunctional handheld devices where the display covers an entire side of the device. Any or all of these devices may include an all encompassing or regional sensing field  19  disposed around and/or above the devices. An example of a multifunctional device can be found in U.S. Provisional Patent Application No. 60/658,777, which is herein incorporated by reference. 
     In another embodiment, the I/O platform  12  is a peripheral stand alone input device such as a keyboard or mouse. The I/O surface  12  of the keyboard includes a plurality of alphanumeric keys. The I/O surface  12  of the mouse includes one or more buttons and possibly a scroll wheel. Any or all of these devices may include an all encompassing or regional sensing field  19  disposed around and/or above the devices. 
     In another embodiment, the I/O platform  12  is a peripheral stand alone input output device such as a monitor that includes a touch screen display. Any or all of these devices may include an all encompassing or regional sensing field  19  disposed around and/or above the devices. 
     In another embodiment, the I/O platform  12  is a wireless peripheral stand alone input device such as a remote control. Remote controls typically include a plurality of buttons and keys and may include a display. Any or all of these devices may include an all encompassing or regional sensing field disposed around and/or above the devices. 
       FIG. 2  is a diagram of an I/O platform  30 , in accordance with one embodiment of the present invention. The I/O platform  30  includes an I/O surface  32  including any number of I/O devices  34  in any number of combinations. The I/O platform  30  also includes an IR sensing circuit  36  for detecting the presence of an object  38  in close proximity but spaced apart from the I/O surface  32  (non contact). The IR sensing circuit  36  works by sending pulses of light, and detecting the light when it reflects off of the object  38  above the I/O surface  32 . The IR sensing circuit  36  includes an emitter  40  (light source) and a detector  42 . The emitter  40  generates light in the infrared bands. The emitter  40  may for example be an LED or laser diode. The detector  42 , on the other hand, is configured to detect changes in light intensity. This is generally accomplished by mechanisms capable of varying electrically as a function of light intensity. The detector  42  may for example be a phototransistor. 
     During operation, the light from the emitter  40  hits the object  38  and scatters when a object is present above the I/O surface  32 . At least a portion of the scattered light is reflected towards the detector  42 . The increase in light intensity is read by the detector  42 , and this is interpreted by a controller  44  to mean an object is present. If no object is present, the light is not reflected back towards the detector  42 , and this is interpreted by the controller  44  to mean an object is not present. 
     In one embodiment, the emitter  40  and detector  42  are disposed within a housing  46  and underneath a window  48  of the housing  46 . The window may be formed from a translucent or semi translucent material. The window may be the entire surface or it may only be a portion of the housing  46 . The emitter  40  and detector  42  may be located at any position within the I/O surface  32 . In some cases, the emitter  40  and detector  42  are located at the edge (e.g., bezel), and angled inward towards one another to improve the detection. It should be appreciated, however, that this is not a requirement. For example, they may also be positioned at more central locations and may even be positioned around a particular I/O device. Furthermore, although only one emitter  40  and detector  42  are shown, it should also be appreciated that this is not a limitation and that multiple sets may be used. This may be done to improve detection (e.g., averaging) or to create a multiple sensing fields or nodes. In some cases, an array of emitters and corresponding detector array may be used. 
       FIG. 3  is a diagram of an I/O platform  50 , in accordance with one embodiment of the present invention. The I/O platform  50  includes an I/O surface  52  including any number of I/O devices  54  in any number of combinations. The I/O platform  50  also includes a capacitive sensing circuit  56  for detecting the presence of an object  58  in close proximity but spaced apart from the I/O surface  52  (non contact). The capacitive sensing circuit  56  works by detecting changes in capacitance in an area  60  above the I/O surface  52 . As should be appreciated, when an object (e.g., finger) is placed in the sensing area  60 , the value of the capacitance changes due to the fact that the finger has different dielectric properties than air. Any changes can therefore be used to determine the presence of the object  58  above the I/O surface  52 . 
     The capacitive sensing circuit  56  may include one or more capacitive sensing nodes  62 . The nodes  62  may be positioned within, around and/or underneath the I/O devices  54  supported by the I/O surface  52 . 
     The capacitive sensing nodes may be widely varied. For example, they may be based on self capacitance or mutual capacitance. In self capacitance, each of the nodes  62  typically consist of a conductive electrode. In mutual capacitance, each of the nodes  62  typically consists of conductive wires lying crosswise relative to each other (the point where the wires cross is considered the node). In either case, the conductive element may be integrally formed into the housing walls  64  of the I/O platform  50  or they may be located behind the housing walls  64  of the I/O platform  50 . The housing wall  64  may for example be the housing wall that supports the I/O surface  52 . Alternatively or additionally, the conductive elements may be integrated within the I/O devices themselves. Furthermore, they are typically coupled to a controller  66  that monitors the capacitance changes at each conductive element. By detecting changes in capacitance at each of the conductive elements, the microcontroller  66  can determine the presence of a object  58  or lack thereof above the I/O surface  52 . 
     In one embodiment, a single node may be configured to cover the entire I/O surface. For example, in the case of self capacitance, a single electrode may be spread across the entire I/O surface. 
     In another embodiment, a single node is configured to cover some sub region of the I/O surface. In one implementation of this embodiment, for example, a single node may be configured to cover all the areas of the housing wall  64  that surround the various I/O devices  54 . In another implementation, a single node is configured to cover all the areas underneath the various I/O devices  54 . In another implementation, a single node may be positioned at one or more of the I/O devices  54  rather than the entire set of I/O devices. These nodes may be positioned around and/or underneath the I/O devices  54 . In another implementation, a single node may be positioned around the edge of the I/O surface  52  (e.g., bezel). 
     In another embodiment, multiple nodes may be configured to cover the entire I/O surface  52 . By way of example, the multiple nodes may be laid out in a pixilated array of sensing nodes. For example, in the case of mutual capacitance, the wires may be formed as a grid with a plurality of sensing nodes. 
     In another embodiment, multiple nodes may be configured to cover some sub regions of the I/O surface  52 . In one implementation, for example, a multiple nodes may be configured to cover all the areas that surround the various I/O devices  54 . In another implementation, multiple nodes are configured to cover all the areas underneath the various I/O devices  54 . In another implementation, multiple nodes may be positioned at one or more of the I/O devices  54  rather than the entire set of I/O devices  54 . These nodes may be positioned around and/or underneath the I/O devices  54 . In another implementation, multiple nodes may be positioned around the edge of the I/O surface  52  (e.g., bezel). 
     The proximity based capacitive sensing circuit may be configured to work similarly to a touch based capacitive sensing circuit, and in some cases the circuits may be one and the same. For example, using a smart controller, a touch based device may be configured to sense objects that are not touching but in close proximity to the touch surface. Typically, the capacitance increases as a finger approaches the touch surface, and further increases as the finger presses on the touch surface. 
       FIG. 4  is a diagram of a method  80  of operating an I/O platform, in accordance with one embodiment of the present invention. The method begins at block  82  where a proximity sensing field is generated above an I/O device. The sensing field may for example be generated using techniques associated with capacitance or infrared technologies (or others mentioned above). The sensing field is spaced apart (non contact) but in close proximity to the I/O devices. The distance between the I/O device and the sensing field may be as small as about 2 mm and as large as about 30 mm, and more particularly between about 2 mm and about 10 mm. Capacitance sensing fields may for example be between about 2 mm and about 3 mm while IR fields can be just about anywhere (e.g., focused to a particular distance above the surface). 
     In block  84 , disturbances or changes in the sensing field are detected and thereafter registered as a proximity event. For example, when a finger is placed within the sensing field, the sensing field is disturbed and a controller translates this disturbance to mean that a finger is present. In the case of a capacitive proximity sensor, which may be separate component or a part of a capacitive sensing touch pad, the finger changes the capacitance at the sensing field and this change is registered as a proximity event. In the case of an IR proximity sensor, the finger scatters the light from the emitter when it is placed near the sensing field, and the scattered light is measured by a detector. Changes in light intensity is registered as a proximity event. 
     Thereafter, in block  86 , a proximity control signal is generated based on the presence of the finger in the proximity sensing field. This is typically accomplished before any other touch based inputs are received since the finger passes through the sensing field on its way to actuating the touch based I/O devices. The proximity control signal can be used to affect the I/O platform in some non trivial manner or it can be used as a control signal in a host device. 
       FIG. 5  is a simplified side elevation view of a portable computing device  100 , in accordance with one embodiment of the present invention. The portable computing device  100  may for example be a portable computer, tablet PC, PDA, media player (e.g., music player, video player, game player), digital camera, GPS module, and the like. 
     The portable computing device  100  may be a handheld computing device. As used herein, the term “hand-held” means that the computing device has a form factor that is small enough to be comfortably held in one hand. A hand-held computing device may be directed at one-handed operation 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, and media players are examples of hand-held 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. PDA&#39;s and game players are examples of hand-held device that are typically operated with two hands. In the case of the PDA, for example, the user may grasp the device with one hand and make entries using the other hand, as for example using a stylus. In the case of the game player, the user typically grasps the device in both hands and make entries using either or both hands while holding the device. 
     The hand-held device may further be sized for placement into a pocket of the user (e.g., pocket sized). By being pocket-sized, the user does not have to directly carry the device and therefore the device can be taken almost anywhere the user travels (e.g., the user is not limited by carrying a large, bulky and often heavy device, as in a laptop or notebook computer). 
     As shown, the computing device  100  generally includes a housing  102  for enclosing internally various electronic components associated with operating the computing device  100 . In general, the housing  102  serves to surround the internal electronic components at a peripheral region thereof so as to cover and protect the internal components from adverse conditions. The internal electrical components may include mechanisms for processing, generating, transmitting and receiving data associated with operating the portable computing device. By way of example, the internal electronic components may take the form of integrated circuits (e.g., processors, controllers, memory), or other electrical devices (e.g., circuit boards, cables, fans, power supplies, batteries, hard drive, disk drive, modem, connectors, etc.). 
     The computing device  100  also includes a user interface  104  that is the point of communication between the device  100  and the user of the device  100 . The user interface may include any number of UI features, which can be located on any of the surfaces of the housing  102 . In most cases, however, a predominant number of the UI features are placed on a front surface of the computing device  100 . The UI features  106  may be embodied in a variety of ways and may include any number of input and/or output devices including but not limited to switches, buttons, dials, sliders, navigation pads, touch pads, touch screens, displays, speakers, and the like. 
     The UI features may even include advanced devices such as mechanically actuated touch pads such as those described in U.S. patent application Ser. No. 10/643,256, touch sensitive housings such as those described in U.S. patent application Ser. No. 11/115,539, multipoint sensing touch pads or touch screens such as those described in U.S. patent application Ser. No. 10/840,862, display actuators such as those described in U.S. patent application Ser. No. 11/057,050, all of which are herein incorporated by reference. 
     In one embodiment, the user interface  104  of the computing device  100  includes a full screen or near full screen display  108 . A full screen display is a display that consumes, or at least dominates, a surface (e.g., front surface) of the computing device  100 . In one example, a full screen display consumes substantially the entire front surface of the computing device  100  (in both directions). The full screen display may for example consume at least 90% of a front surface of a housing for the computing device. 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 is wide, the full screen display may have a traditional aspect ratio of about 4:3. If the device is elongated, the full screen display may have an aspect ratio that is more panoramic such as 16:9. 
     In this embodiment, in order to provide input functionality, the user interface  104  may additionally include a touch screen  110  disposed over the full screen display  108 . The touch screen  110  may extend completely over the full screen or it may only cover a portion of the full screen. In most cases, the touch screen  110  covers at least the display portion of the full screen display  108 . A multifunctional device that utilizes a full screen display among other advanced UI features may be found in U.S. Provisional Pat. App. No. 60/658,777, which is herein incorporated by reference. 
     Although a touch screen display is shown, it should be appreciated that the user interface may include any combination of input output devices such as any of those described above, or any of those further described in the applications incorporated by reference. 
     The computing device  100  also includes a proximity detection system  112 . The proximity detection system is configured to detect when an object such as a finger (or stylus) comes in close proximity to the computing device  100 . Proximity sensing differs from touch sensing in that there is no contact. The sensing occurs above the surface of the housing  102 . For example, the proximity detection system  112  detects when an object such as a finger is placed in space above, and not in contact with, a surface of one or more regions of the computing device  100 . The regions may include any side or any portion of a side of the computing device  100 . 
     Proximity detection can be performed using a variety techniques. The techniques general depend on the object that is to be detected (e.g., finger, plastic, metal), the environmental conditions surrounding the computing device, the size of the computing device, and the costs associated with the proximity sensing technique, the resolution of the proximity sensing technique, etc. By way of example, the proximity detect system  112  may be based on techniques such as capacitive, electric field, inductive, hall effect, reed, eddy current, magneto resistive, optical shadow, optical visual light, optical IR, optical color recognition, ultrasonic, acoustic emission, radar, sonar, conductive or resistive. In each of these cases, the proximity detection system  112  may include one or more proximity sensors and/or switches. Switches are similar to sensors except that they provide a switch output when an object is detected. Furthermore, depending on the technology used, the proximity detect system may be hidden from view (e.g., internal to the housing) or it may be in plane sight to the user (e.g., external to the housing). 
     In one embodiment, the capacitance sensing circuit described in  FIG. 3  (or similar circuit) is used. In another embodiment, the IR sensing circuit described in  FIG. 2  (or similar circuit) is used. 
     In one embodiment, the proximity detection system  112  is configured to detect the presence of an object at the user interface  104  of the computing device  100 . Using the illustrated example, the U.I.  104  is located at the front surface of the housing  102 , and thus the proximity detection system  112  is configured to generate a sensing field  114  over all or some portion of the front surface of the housing  102 . As mentioned previously, this may be accomplished with single or multiple sensing nodes, and regionally or over the entire surface. 
     In one implementation, the user interface  104  is activated from a dormant state when an object is detected. For example, the device may be woken up from a sleep mode. When it wakes up, the display  108  may be fully powered and the touch screen  110  may be readied for receiving touch inputs (e.g., unlocked). 
     In another implementation, the features of the user interface are altered when an object is detected. For example, buttons and switches may be illuminated and readied for input, or particular GUI elements on a display may brought into view and readied for receiving inputs. The later example may allow the display  108  to keep GUI controls and tools hidden until a user makes a motion to use the touch screen  110  or other input device. The GUI controls and tools that pop up when a finger is detected may be standard set of tools or they may be based on other factors including the location of the finger and/or the application currently running in the computing device  100 . For example, in a music application, an onscreen control box that includes menu, play/pause, seek, and the like may be presented when a user hovers their finger above the user interface (especially the input portion of the user interface). Alternatively, an onscreen or virtual scroll wheel may be presented so that a user can scroll through a list of songs. Once the GUI control element is presented, the user may make selections associated therewith by using one of the input devices provide by the computing device (e.g., touch screen) or by performing a proximity gesture. A proximity gesture can be similar to a touch gesture except that it is performed without contact, and in some cases may even include a z component along with an x and y component. 
       FIG. 6  is a diagram of a proximity based method  150 , in accordance with one embodiment of the present invention. The proximity based method may be performed on any electronic device as for example any of those previously described. By way of example, the method may be performed in the computing device of  FIG. 5 . The method  150  includes at least two blocks—blocks  152  and  154 . In block  152 , an object spaced away and in close proximity to an electronic device is sensed (e.g., non contact). This may for example be accomplished with any of those proximity detection systems described above. The sensing may be performed over the entire surface or regionally at particular locations of the electronic device as for example a single side, plurality of sides, all sides, a portion of single side, different portions of a single side, portions on multiple sides, and the like. The sensing may be configured to detect the presence of or lack of an object around the sensing field located above and in close proximity to the surface of the electronic device. Alternatively or additionally, the sensing may be broken up into nodes, pixels or juxtaposed sensing areas that cooperate to monitor the motion of an object as it is moved in the sensing field (this may be analogous to tracking as for example when using a touch pad or touch screen). 
     In block  154 , an action is performed in the electronic device when an object is detected. The actions may be widely varied. The actions, may for example, include logging onto a computer or a computer network, loading a user profile associated with a user&#39;s preferred arrangement of the computer desktop, launching a particular program, opening a file or document, opening a particular GUI element, viewing a menu, making a selection, executing instructions, encrypting or decoding a message, operating an input/output device and/or the like. 
       FIG. 7  is a diagram of a method  200  of operating an electronic device, in accordance with one embodiment of the present invention. The method begins at block  202  where an object is sensed in the space above a user interface. The user interface may include for example a display, touch pad or a touch screen display (or any of those mentioned above). 
     Following block  304 , the method proceeds to block  204  where the user interface or some portion of the user interface is activated or affected in a non trivial manner when an object is detected above the user interface. In one embodiment, the user interface is activated from a dormant state as for example when the device is in a sleep mode to save battery power or lock mode to prevent inadvertent entries at the user interface. In another embodiment, individual features of the user interface may be activated. For example, buttons, switches or navigation pads may be unlocked and illuminated. Alternatively or additionally, a display may display a GUI interface as for example one that includes tools or controls for operating some aspect of the electronic device. 
     The method also includes block  206  where the activated portion of the user interface is deactivated when an object is no longer detected. The deactivation may be instantaneous or it may be based on a time out. In the later case, the user interface may be deactivated when an object is not detected for a preset amount of time (e.g., 1 minute). 
       FIG. 8  is a diagram of a proximity method  250  of operating an electronic device, in accordance with one embodiment of the present invention. The method begins at block  252  where the presence of an object is detected over a user interface feature. The user interface feature may for example be a display, touch screen display, touch pad or some other navigation/selection based device. 
     Following block  252 , the method proceeds to block  254  where a display portion of the user interface displays and enables a particular graphical user interface element when the presence of the object is detected. By way of example, the graphical user interface element may be a tool box or control panel associated with the application currently running on the electronic device. 
     Following block  254 , the method proceeds to block  256  where input features of the user interface are monitored for user inputs. For example, a touch screen, touch pad or some other navigation/selection based device may be used to generate user inputs. Alternatively or additionally, a proximity based device may be used to generate user inputs. 
     Following block  256 , the method proceeds to block  258  where one or more actions are performed in the particular graphical user interface element based on the user inputs. 
     In block  260 , the graphical user interface element is disabled and removed from the display when the presence of the object is no longer detected. This may be instantaneous or based on a time out. 
     In one embodiment, block  256  is associated with a touch sensing device such as a touch screen or touch pad, and therefore block  256  includes monitoring touch events that occur on the touch sensitive surface of the touch sensing device. These events may include tracking and selection events, which are normal to touch sensing devices. 
     In one implementation, the touch sensing device is further configured to differentiate between light touch interactions and hard touch interactions that occur on the touch sensing surface. This may for example be accomplished by monitoring the forces exerted on a touch sensing surface during a touch event. The light touch interactions can be used to perform passive actions such as navigating through content, and content manipulation generally without causing a major event to occur. Examples of passive events include moving a cursor, scrolling, panning, etc. The hard touch interactions, on the other hand, can be used to select on screen buttons or initiate commands (e.g., causes a significant change to occur). In this embodiment, the inputs may include three input levels, proximity, light touch and hard touch. 
       FIG. 9  is a diagram of a touch method  300 , in accordance with one embodiment of the present invention. The touch method  300  may for example be included in block  256  of  FIG. 8 . The touch method  300  begins at block  302  where one or more touches are detected. The touches include not only x any y components but also z components. The x and y components are supplied by a touch sensing device such as touch screen, touch pad or touch housing. The z component, on the other hand, is generally provided by force sensors located behind the touch surface of the touch sensing device. By way of example, the x, y and z components may be supplied by a display arrangement that includes a touch screen positioned over a display and a force sensing device disposed underneath the display. The x, y and z components may also be supplied by a touch pad or touch housing that includes a touch sensitive surface and force sensing device underneath the touch sensitive surface. Additionally or alternatively, the z component may be supplied by a physical switch located behind the touch surface (display actuator), or possibly using the touch surface itself (e.g., contact patch areas that increase in size based on increases in touch pressure). 
     Following block  302 , the method proceeds to block  304  where a determination is made as to whether the touch is a light or hard touch (e.g., differentiating whether the detected touch is a light touch or a hard touch). The determination is generally based on the force or pressure of the touch (z component). For example, if the force of the touch is smaller than a predetermined threshold then the touch is considered a light touch and if the force of the touch is larger than the predetermined threshold then the touch is considered a hard touch. 
     If it is determined that the touch is a light touch, the method proceeds to block  306  where a passive action is initiated when a touch event is performed. Examples of passive actions include navigation, moving a cursor, scrolling, panning, etc. If it is determined that the touch is hard touch, an active action is initiated when a touch event is performed. Examples of active actions include making selections and implementing commands. 
     Although not a requirement, the touch method may additionally include a block where the one or more touches are classified as a primary touch or a secondary touch. Primary touches are touches that are intended to cause an action while secondary touches are touches that are not intended to cause an action. Gestures are examples of primary touches while a thumb positioned over the touch area in order to hold the hand-held device is an example of a secondary touch. Once the touches are classified as primary or secondary, the secondary touches are filtered out, and the determination of whether a touch is a light or hard touch is made with the primary touches. 
       FIG. 10  is user interface method  400 , in accordance with one embodiment of the present invention. The user interface method  400  may for example be performed on a computing device having a display, a touch sensitive input device such as a touch screen and a proximity detector. The user interface method  400  begins at block  402  where an object such as a finger or stylus is detected above and spaced away from the display. This may be accomplished with the proximity detector when the finger crosses into the sensing field of the proximity detector. In some cases, the touch screen may act as a proximity detector as for example in cases where the touch screen is based on capacitance. The controller can be configured to monitor changes in capacitance even when there is no touch. The object however typically has to be fairly close to the touch surface of the touch screen. 
     Once the object is detected, the user interface method  400  proceeds to block  404  where a user interface (UI) mode is determined. The user interface mode may be widely varied. The user interface mode may include scroll modes, data entry modes, edit modes, control modes, information modes, etc. Each mode typically has one or more GUI interface elements associated therewith. By way of example, a virtual scroll wheel or slider bar may be associated with a scroll mode, a keyboard or keypad may be associated with data entry mode, a tool bar such as a formatting tool bar or drawing tool bar may be associated with an edit mode, a control panel including buttons may be associated with a control mode, a window may be associated with an information mode, etc. 
     The user interface mode may be determined at block  404  based on one or more conditions including for example, one or more applications currently running on the computing device, the current state or mode of the one or more applications and/or the proximity characteristics (e.g., location). In fact, determining the user interface mode at block  404  may involve monitoring and analyzing one or more conditions. 
     The current applications may for example include operating systems (e.g., Mac OS), word processing programs, spreadsheet programs, draw editing programs, image editing programs, gaming programs, photo management programs (e.g., iPhoto), music management programs (e.g., iTunes), video editing programs (e.g., iMovie), movie management programs (e.g., QuickTime), music editing programs (e.g., GarageBand), Internet interface programs and/or the like. 
     The current state or mode of the applications may correspond to an active portion of the application (e.g., current window or windows within windows). For example, the active portion of a music management program may correspond to a music control mode, a playlist select mode, a menu mode, and/or the like. Further, the active portion of a photo management program may correspond to photo browsing mode or photo editing mode. Further still, the active portion of an internet interface program may correspond to a web mode or an email mode. 
     The proximity characteristics on the other hand may, for example, correspond to location, number of detected objects, etc. 
     With regards to applications, different applications may indicate different UI modes. For example, a word processing or spreadsheet application may indicate a data entry mode, while a music management program may indicate a control or scrolling mode. With regards to the current state of an application, different modes of the application may indicate different UI modes. For example, in a music management program, a menu window may indicate one UI mode, while a play list window may indicate another UI mode. 
     With regards to proximity, the number of fingers may indicate different UI modes. For example, one finger may indicate a first mode while two fingers may indicate a second mode. In addition, the location of the finger(s) may indicate different UI modes. For example, a first location may indicate a first UI mode, while a second location may indicate a second UI mode (if the object is located over a border of a music program a first UI mode may be implemented, and if the object is located over a play list or list of songs in the music program a second UI mode may be implemented. 
     In one embodiment, the user interface mode is based on only one of the conditions. For example, the user interface mode is only based on the application, the current state of the application or one of the various proximity characteristics as described above. In another embodiment, the user interface mode is based on multiple conditions. For example, the user interface mode may be based on a combination of at least two selected from the application, the current state of the application and the various proximity characteristics. By way of example, the application combined with a first proximity characteristic may indicate a first UI mode and the same application combined with a second proximity characteristic may indicate a second UI mode. 
     To cite a few examples, if the application is a word processing or spreadsheet program then the mode may be determined to be a data entry mode so that data can be entered into the spreadsheet (e.g., keyboard). If the application is a music management program and a playlist is currently showing (active portion), the mode may be determined to be a scroll mode so that the items in the list may be scrolled through in order to find a desired item (e.g., scroll wheel). Alternatively, if a song is playing (active portion), the mode may be determined to be a control mode so that the manner in which songs are played can be controlled (e.g., play, stop, seek and volume control options). Further, if the application is a photo management program and a particular photo is displayed (active portion), the mode may be determined to be a control mode so that the photo can be modified (e.g., converting to black and white, removing red eye, and rotate options). 
     After determining the user interface mode  404 , the user interface method  400  proceeds to block  406  where one or more GUI elements are displayed based on the user interface mode. This may be accomplished with the display device. In some cases, only one GUI element is displayed and in other cases multiple GUI elements are displayed. The GUI element is typically associated with a particular mode. For example, a slider bar or scroll wheel may be displayed in a scroll mode, a keyboard or keypad may be displayed in a data entry mode, a tool bar may be displayed in an edit mode, various buttons or a control panel may be displayed in a control mode, and information windows may be displayed in an information mode. 
     The GUI element may be displayed in a variety of ways. For example, it can be positioned over the currently displayed graphical images, or it can displace the currently displayed graphical images (e.g., minimize, shift, etc.). In some cases, the GUI element is made semi transparent so that the current graphical image disposed below the GUI element can be seen (thereby eliminating minimizing and shifting). This may be helpful when using a scroll wheel to traverse through a list disposed below the scroll wheel. Furthermore, the GUI element can be placed in the vicinity of the touch or it can be placed in some predetermined location. The predetermined location may be based on ergonomics, i.e., what is the best location for the user. 
     In addition to the above, the GUI element may be displayed using a transition effect such as growing, fading in, popping up, and in some cases may even pulsate, throb, etc. If the effect is popping up, the GUI element is immediately brought into view. If the effect is growing, a small GUI element (e.g., scroll wheel) is initially displayed, and thereafter the GUI element continuously enlarges through various sizes until it reaches its desired size. In addition, the final size of the GUI element may be based on the length of time the object is detected. For example, the GUI element stops growing when the touch is no longer detected. Alternatively, the speed and size may be user adjustable as for example through a control panel. If the effect is fading, the GUI element is slowly brought into view from nothing, through various levels of distortion or transparency, to a final complete image. The fading can be controlled similarly to growth. For example, the level of fade may be controlled by the length of time the object is detected. 
     The transition effect may even carry over to the currently displayed images, i.e., the images currently displayed before the object was detected. In one embodiment, the opposite effect happens to the currently displayed images. For example, the currently displayed graphical images are minimized smaller and smaller as the GUI element grows larger and larger. Alternatively, if the GUI element immediately pops in, the currently displayed graphical images can immediately pop out or be immediately minimized. 
     In block  408 , the functionality of the GUI element is enabled. When enabled, the GUI element is readied for receiving inputs. In the case of a touch screen, for example, touch events are monitored relative to the GUI element and actions associated with the touch event are performed. The enablement may occur simultaneously with the display of the GUI element so that a user can immediately start using the GUI element once displayed. By way of example, in a scroll mode, a virtual scroll wheel may be displayed and when enabled, the touch events are monitored relative to the scroll wheel. During monitoring, control signals associated with the position of the finger on the scroll wheel are generated as the finger swirls around the virtual scroll wheel. These signals can be used to perform scrolling. For example, the number, combination and frequency of the signals may be converted into distance, direction and speed necessary for moving a selection bar through a list. Examples of virtual scroll wheels and their operations may be found in U.S. patent application Ser. Nos. 10/903,964 and 11/038,590, both of which are herein incorporated by reference. 
     At some point after enabling and displaying the GUI element, a determination  412  is made as to whether or not to deactivate the GUI element. The determination  412  can be made in a variety of ways including, for example: 1) the object is no longer detected, 2) an object has not been detected for a preset amount of time, 3) a time out occurs (a preset amount of time has gone by since the GUI element was first displayed/enabled), or 4) a user selection (e.g., a user selects a button that closes the GUI element). 
     If the determination indicates deactivation, then the method proceeds to block  414  where the GUI element is disabled and removed from display. Once disabled, actions will no longer be performed when a touch event occurs. The removal of the GUI element from display may function similar to displaying the GUI element in that it can be removed using a transition effect such as slowly fading out, shrinking or immediately disappearing (popping out). The removal transition effect may work opposite the displaying transitioning effect. For example, the GUI element fades out similarly to fading in, shrinks similarly to growth or pops out similarly to popping in. Further, the GUI element can slowly recess and disappear from view while the displaced or shrunken current graphical images can slowly grow back to their original size and shape. If the determination does not indicate deactivation, then the method maintains the display of the GUI element as well as the enablement thereof. 
       FIG. 11  is a determination method  450  in accordance with one embodiment of the present invention. The determination method may, for example, correspond to the block  404  in  FIG. 10 . The determination method begins at block  452  where the current application is determined. The determination method proceeds to block  454  where the current state of the application is determined. Following block  454 , the determination method proceeds to block  456  where the proximity characteristics associated are determined. The determination method proceeds to block  460  where a UI mode is selected based on the results from blocks  452 - 458 . By way of example, a set of rules may indicate appropriate UI modes for a particular set of conditions. 
       FIG. 12  is a user interface method  500  in accordance with one embodiment of the present invention. The method may, for example, be performed on a computing device having a display, a touch sensitive input device such as a touch screen and a proximity detector. The interface method  500  begins at block  502  where a list of songs are displayed.  FIG. 13A  shows one example of a window  530 A including a list of songs  532 A, and  FIG. 14A  shows another example of a window  530 B including a list of songs  532 B.  FIG. 13A  may, for example, be a graphical user interface displayed on an iPod® manufactured by Apple Computer of Cupertino, Calif., and  FIG. 14A  may for example be a graphical user interface associated with a music management program, such as iTunes® manufactured by Apple Computer of Cupertino, Calif. 
     Following block  502 , the user interface method  500  proceeds to block  504  where an object is detected over the displayed list of songs (or window or entire GUI). This may be accomplished with the proximity detector when an object such as a stylus or one or more fingers is placed above the touch screen display.  FIGS. 13B and 14B  show a finger  525  placed over the window  530  including the list of songs  532 . Although shown in this figure, the finger is spaced away and not in contact with the touch surface. 
     Once the presence of an object is detected, the user interface method  500  proceeds to block  506  where a virtual scroll wheel is activated. That is, a virtual scroll wheel is displayed in addition to the list of songs and its functionality is enabled. In essence, because the song list was active, a scroll wheel that allows a user to traverse through the songs in the list of songs is provided. In some cases, the virtual scroll wheel displaces the media items, i.e., the media items are minimized or shifted to make room for the virtual scroll wheel. In other cases, the virtual scroll wheel is positioned or laid over the media items (the media items keep their current size, shape and position). The virtual scroll wheel can be made semi-transparent so that the media items can be viewed through the virtual scroll wheel.  FIGS. 13C and 14C  show a transparent virtual scroll  936  wheel laid over the window  530  including the list of songs  532 . Alternatively, a virtual slider bar may be displayed. 
     Once displayed, a determination  508  is made as to whether or not a scrolling event (or gesture) is performed relative to the virtual scroll wheel. For example, whether or not a finger is positioned over the scroll wheel and whether or not the finger is moved around the scroll wheel in a swirling fashion. The scroll event may be a proximity event or a touch event. 
     If a scrolling event is performed by the user, the user interface method  500  proceeds to block  510  where scrolling is implemented through the list of songs in accordance with the scrolling touch event. By way of example, a selector bar may be moved from one song to another as the finger is swirled around the virtual scroll wheel.  FIGS. 13D and 14D  show the finger  525  swirling around the virtual scroll wheel  536 , and a selector bar  538  moving linearly through the list of songs  532  in accordance with the swirling finger  525 . In the illustrated embodiments, the selector bar is moved linearly up when the finger is swirled in a clockwise fashion and linearly down when the finger is swirled in a counterclockwise fashion. It should be noted, however, that this is not a limitation. For example, the selector bar may moved linearly down when the finger is swirled in a clockwise fashion and linearly up when the finger is swirled in a counterclockwise fashion. 
     If a scrolling or select touch event is not performed, the user interface method  500  proceeds to block  516  where the virtual scroll wheel is deactivated. That is, the virtual scroll wheel is disabled and removed from the display.  FIGS. 13E and 145E  show the display  528  without the virtual scroll wheel  536 . Although the virtual scroll wheel  536  is removed, changes made to the list of songs, i.e., the position of the selector bar  538 , typically remain. 
     In some cases, the virtual scroll wheel may include button zones across its surface or a virtual button at its center or around its sides. The buttons and button zones may for example correspond to menu, play, seek, pause, and/or the like. In this particular embodiment, the method described above may include additional steps that occur before block  516 . For example, if a scrolling touch event is not performed, the user interface method  500  may include an additional block where a determination is made as to whether or not a selection touch event (or gesture) is performed relative to the virtual scroll wheel. The selection touch event may be implemented by tapping the button or by exerting increased or decreased pressure on the button rather than swirling around the surface of the virtual scroll wheel (see  FIGS. 13F and 14F ). If the button is a song select or enter button, the method include another block where the song with the selector bar disposed thereover is selected. That is, when the virtual button is tapped, or otherwise selected, the song currently covered by the selector bar is played and outputted for the user&#39;s enjoyment. 
     It should be noted that the methods described above are not limited to scrolling through a list of songs. Any media item as well as any group of elements can be scrolled through using the aforementioned technique. For example, in photo layout  542  as shown in  FIGS. 15A-15C , the virtual scroll wheel  536  may appear when the user places their finger  525  over the photo layout  542  (or grouping), and thereafter it can be used to move a highlighter  544  through the various photos  543  in the layout  542 . By way of example, the photos may be thumbnails images that make traversing through a large number of images easier. 
       FIG. 16  is a method  600 , in accordance with one embodiment of the present invention. The method begins at block  602  where it is determined if an object in space is detected. If an object is detected, the method proceeds to block  604  where the current operating conditions are monitored and analyzed. The conditions may for example correspond to the current application, the state of the application and/or the proximity characteristics associated with the object. 
     If a first set of conditions are implemented, the method proceeds to block  606  where a first GUI element is activated. For example, as shown in  FIGS. 17A-B , in an active window  660  of a music management program, a scroll wheel  662  may be activated when a user places their finger above a playlist portion  664  of the active window  660  without touching the touch surface. 
     If a second set of conditions are implemented, the method proceeds to block  608  where a second GUI element is activated. For example, as shown in  FIGS. 17B-C , in the active window  660  of a music management program, a music control panel  667  may be activated when a user also touches a border  668  of the active window  660 . Although they work independent of one another, the first and second GUI elements may be activated at the same time if the first and second conditions occur simultaneously ( FIG. 13C ). 
     Following block  606 , the method proceeds to block  610  where it is determined if the first GUI element should be deactivated. If so, the method proceeds to block  612  where the GUI element is deactivated. For example, as shown in  FIG. 17D , the first GUI element (scroll wheel  662 ) is disabled and removed from display when the finger  625  is no longer detected over the playlist  662 . If not, the method maintains block  606 . 
     Similarly but independently, following block  608 , the method proceeds to block  614  where it is determined if the second GUI element should be deactivated. If so, the method proceeds to block  616  where the GUI element is deactivated. For example, as shown in  FIG. 17E , the second GUI element (control panel  667 ) is disabled and removed from display when the finger  625  is no longer detected over the border  668 . If not, the method maintains block  608 . 
     It should be noted that the method is not limited to only two GUI elements and that other GUI elements may be activated if other conditions are implemented (N+1). For example, as shown in  FIG. 17F , the user may move their finger  625  from over the border  668  to over a menu portion  670  of the active window  660  thereby initiating a change from the control panel  667  to a scroll wheel  672  (e.g., while the second GUI element is being deactivated, the third GUI element is being activated). 
     Further, as shown in  FIG. 17G , the user may add another finger  625  to the mix thereby initiating a change from the first control panel  667  to a second control panel  682 . The first control panel  667  may include a first set of control options such as play, stop, seek and volume options and the second control panel  682  may include a second set of control options such as song playing order, song information, light effect options. 
     Moreover, as shown in  FIG. 17H , the user may place one finger  625 A over the border  668 , another finger  625 B over a menu portion  670 , and yet another finger  625 C over the playlist portion  664  thereby initiating three different GUI elements, particularly, a control panel  667 , a first scroll wheel  672  for scrolling through the menu  670 , and a second scroll wheel  662  for scrolling through the playlist  664 . 
     In addition, multiple GUI elements can be activated in the same portion. For example, as shown in  FIGS. 171 and 17J , if the user places their finger over a particular box  690  in the playlist  664 , a keyboard  692  may be activated so that the user can enter data associated with the song (e.g., title, artist, genre, etc.). If the scroll wheel  662  is active at the same time as the keyboard  692 , the scroll wheel  662  may be minimized to accommodate the keyboard  692  as shown. Once the keyboard  992  is deactivated, the scroll wheel  662  reverts back to its original size. 
       FIG. 18  is a diagram of a GUI operational method  700 , in accordance with one embodiment of the present invention. The GUI operational method  700  is configured for initiating zooming targets. The GUI operational method  700  generally begins at block  702  where a control box GUI element is displayed. The control box contains one or more control buttons, which are somewhat close together, and which can be used to perform actions. The control box may, for example, include control buttons such as maximize, minimize, close, and the like. Following block  702 , the GUI operational method  700  proceeds to block  704  where the control box is enlarged, or at least one of the control buttons is enlarged for a period of time when the presence of an object is detected above the touch screen and over the control box or one of the control buttons. In the case where the control box is enlarged each of the control buttons is enlarged thereby making selection thereof much easier. In the case where only the control button is enlarged, the user would decide whether this is the correct button and if so select the enlarged control button, or restart the process so that the appropriate control button is presented. In most cases, the size of the control buttons corresponds to the size of the finger so that they may be easily selected by the object. Following block  704 , the GUI operational method  700  proceeds to block  706  where a control signal associated with the selected control button is generated when the object is placed on the touch screen and over one of the enlarged control buttons. 
       FIGS. 19A-19D  illustrate a zooming target sequence using the GUI operational method  700  described above. As shown in  FIG. 19A , a user  710  places their finger  776  above the touch screen and over a control box  778 . Because the buttons  780  of the control box  778  included therein are smaller than the finger  776  and located close together, it is difficult for the user  710  to make a selection directly without possibly pressing an undesirable button  780 , e.g., a button adjacent the desired button. By way of example, the finger  776  may cover two or more of the buttons  780 . As shown in  FIG. 19B , at least a portion of the control box  778  is enlarged including the buttons  780  included therein when the finger is detected. As shown in  FIG. 19C , once the control box has reached its enlarged state, the user can select one of the enlarged buttons, which is now closer to the size of the finger using the touch screen. By way of example, the user may tap on the desired control button. As shown in  FIG. 19D , the control box reduces to its initial size after the button is selected or after a predetermined time period in which no selection was made (e.g., times out) or when the user moves their finger substantially away from touch screen (out of the proximity sensing area) or when the user moves their finger out of the area of the control box while still in the sensing area of the proximity detector. 
       FIG. 20  is an expansion method  800 , in accordance with one embodiment of the present invention. The method may be implemented on computing devices having a touch screen display and a proximity detector. The method generally begins at block  802  where graphical information is presented on the touchscreen display. This is typically accomplished with the display portion of the touchscreen display. In most cases the graphical information fills the entire display screen, although in some cases it may only fill a portion of the display screen. The graphical information may for example be a graphical user interface (GUI). As is generally well known, the GUI represents, programs, files and operational options with graphical images. The graphical images may include windows, fields, dialog boxes, menus, icons, buttons, cursors, scroll bars, etc. During operation, the user can select and activate various graphical images in order to initiate functions and tasks associated therewith. By way of example, a user may select a button that opens, closes, minimizes, or maximizes a window, an icon that launches a particular program or a link that opens a particular web page. In addition, the user may actuate user interface controls such as a scroll bar to perform scrolling in the GUI. The GUI can additionally or alternatively display non interactive text and graphics 
     Following block  802 , the method proceeds to block  804  where an object is detected over the touchscreen display. This is generally accomplished with the proximity detector and/or the touchscreen display (e.g., capacitive). Depending on the configuration of the proximity detector, the proximity detector may recognizes one or more objects, as well as the position and magnitude of objects in the sensing region of the proximity detector. 
     Following block  804 , the method proceeds to block  806  where an area or portion of the touchscreen display is expanded proximate the location of the object. Any portion of the touchscreen display can be expanded. The step of expanding may include visually expanding a portion of the presented graphical information in the region of the object relative to the remaining portions of the presented graphical information outside the region of the object. The step of expanding may also include expanding the touch sensitive portions associated with the expanded visual portion. The sensitive portion are points or regions of the touchscreen that are linked to particular points or regions of the graphical information as for example, the touch sensitive region above a graphical button. In most cases, the sensitive portions are scaled with the visually expanded portions. That is, the step of expanding includes scaling the input sensitivity with the expanded visual portions of the graphical information. The scaling may be proportional since the sensitive portions are typically a little larger than the visual portions (the visual portion and the sensitive portion aren&#39;t exactly a 1:1 relationship). By way of example, if the visual portion grows by a factor of 3 then the sensitive portion grows by a factor of 3. 
     During expansion, the visual and/or sensitive portions of the touchscreen display may be magnified and/or increased in size compared to the remaining visual and/or sensitive portions of the touchscreen display. By way of example, the visual portion may grow from its original size to an enlarged size (e.g., from 4 mm to 8 mm) and be magnified from its original state to a magnified state (e.g., from 1× to 2×). Although the expanded portions are enlarged and magnified, in most cases, the expanded portion maintains the same aspect ratio and shape that it has in the unexpended state. As should be appreciated, expansion may be somewhat analogous to zooming. 
     The area that is expanded may be the area underneath the object. Alternatively, the area that is expanded may be offset from the object such as for example above, below or to the sides of the object. This may allow the user to more clearly view the expanded area. 
     The size, magnification and shape of the expanded area may be widely varied. By way of example, and not by way of limitation, the expanded area may have an area of between about 100 mm 2  and about 400 mm 2 , and a height and width between about 10 mm to about 20 mm. Furthermore, the expanded portions may be magnified between greater than 1 time to over a thousand times, more particularly between about 2× to about 100×, and even more particularly, the between about 2× and about 20×. Moreover, the expanded area may be formed from various shapes including but not limited to circles, ovals, squares, rectangles, triangles, and the like. Other shapes such as symbols, logos, characters may also be used. 
     In one embodiment, the expanded portion of the graphical information is raised relative to the non expanded portion of the graphical information. For example, the expanded portion may appear to protrude away from the non expanded portions. This is typically done graphically as both the expanded and non expanded portions are typically produced in the same plane. By way of example, shading principals may be used to make the expanded portion appear to protrude away from the non expanded portions. 
     In some cases, the expanded portion includes a substantially planar plateau region and a substantially sloped transition region. The planar plateau region provides a planar surface for displaying the targeted graphical information and the transition region provides a gradient of growth between the plateau region and the non expanded portion of the graphical information. The transition region, which is the edge of the plateau compacts or compresses the graphical information located between the plateau and the non expanded portion of the graphical information. For example, the graphical information contained in the transition region have compacted or compressed magnification levels (this may distort the graphical information contained therein) In alternative implementations, the plateau may be rounded rather than being planar or the expanded portion may be one large transition region without having a plateau. In either case, the expanded portion may look like a rounded pimple or bump. 
     The expanded portion may be a localized area, which can be any portion of the graphical information. The localized area may include any portion of the graphical information including but not limited to background (e.g., wall paper), windows, fields, text, dialog boxes, menus, icons, buttons, cursors, UI controls or any combination thereof. 
     The expanded portion may also be linked to a particular object of the graphical information. For example, a particular window, field, dialog box, menu, icon, button, tool bar, user interface element (e.g., scroll bar, scroll wheel, slider bar, dial), control box, footnote and the like. In some case, the entire object is expanded. For example, when the finger is placed over a window, the entire window is expanded. In other cases, only a portion of the object is expanded. For example, when the finger is placed over a tool bar, only the selectable items are expanded. As should be appreciated, these objects may need to be expanded so that they can be easily used by a human hand. 
     The time when expansion takes place can be widely varied. In one embodiment, expansion is activated immediately after the touch is detected. In another embodiment, expansion is activated after the object is detected for a predetermined amount of time. In cases such as this, the user may have to hover their finger over the area desired to be expanded for the predetermined amount of time in order to initiate the expansion. By way of example, the dwell time may be between about 0.5 to about 5 seconds, and more particularly about 1 second. This embodiment may be employed to prevent inadvertent expansion. That is, the time delay may be used to avoid implementing expansion with casual contact not intended for expansion. 
     Once expansion is activated, the speed or rate at which the expanded area expands may be widely varied. The growth can happen quickly or slowly. In one embodiment, the expanded area grows from its normal state to the expanded state almost instantaneously. In another embodiment, the expanded area grows over some predetermined amount of time, i.e., the area expands gradually over time. The rate may be preset or it may be based on some external factor. For example, the rate of growth may be based on the touch pressure, i.e., the greater the touch pressure, the greater the rate of change. Alternatively, the rate of growth may be based on multiple taps, i.e., each tap causes incremental expansion. 
     The manner in which expansion is implemented may also be widely varied. In one embodiment, the amount of expansion (size, magnification, etc) is preset. The preset amount may be fixed or it may be adjustable. For example, a user may adjust the characteristics of expansion via a control menu. In another embodiment, the amount of expansion is based on some external factor. In one case, the amount of expansion may be based on the location of the object relative to the graphical information (e.g., region sensitivity). For example, a first located object of the graphical information may be magnified 2× and a second located object of the graphical information may be magnified 16×. In yet another embodiment, the expanded portion may be configured to follow the object as the object is moved across and above the touchscreen display. For example, the location of the expanded portion changes in accordance with the location of the object, i.e., it mirrors the position of the object. 
     Although not shown in  FIG. 20 , the method may include additional steps such as reverting back to a non expanded state when the object is no longer detected. In one embodiment, the expansion is deactivated immediately after the object is no longer detected thereby causing the expanded portion to revert back to its normal state. In another embodiment, expansion is deactivated after a predetermined amount of time, i.e., there is a lag time. The lag time may be preset (e.g., user settable) or it may be based on external factors such as the amount of information located in the expanded area and human factors such as how long the user would take to read or grasp this particular amount of information. The lag time may allow the user to establish if the expanded area is the desired target. If its not the desired target, the user can move their finger to a new target. If it is the desired target, the user may perform additionally steps within the expanded area. By way of example, and not by way of limitation the lag time may be between about 0.5 to about 5 seconds, and more particularly 1 second. 
     The speed or rate at which the expanded area reverts back to its normal state may be widely varied. The atrophy can happen quickly or slowly. In one embodiment, the expanded area atrophies from its expanded state to the normal state almost instantaneously. In another embodiment, the expanded area atrophies over some predetermined amount of time, i.e., the area atrophies gradually over time. 
     The method may also include receiving inputs within the expanded area. The inputs may for example be touch events such as a selection input that is implemented with tapping or increased touch pressure. Alternatively, the input may be a gestural input or a data entry input. By way of example, in an expanded state, a virtual scroll wheel may be capable of being manipulated by a swirling finger gesture or text may be entered into an expanded document. In all of these cases, the expansion may be designed to expand a feature or group of features (such as buttons) so that they are adequately sized for finger manipulation. 
     Moreover, the method may include detecting a second object over the touchscreen display and expanding a second area of the touchscreen display proximate to the location of the second object. In one implementation, the second object is detected at the same time as the first object such that the first and second expanded areas are expanded simultaneously (as for example using a multipoint proximity detection system). In another implementation, the second object is detected after the completion of the first object. In cases such as this, if the placement of the second object occurs during the lag time of the first expansion, then the first expansion may smoothly transition to the second expansion (e.g., as the first gradually shrinks, the second gradually expands). Alternatively, a second object in the region of the expanded area may cause further expansion. For example, if the expanded portion includes a plurality of features, a second object may be used to further expand one or more of the features. Thereafter, the feature may be selected for example by performing a touch event on the touch screen. 
     Alternatively, expansion may not be implemented if more than one object is detected at the same time, i.e., simultaneously. This “double object” could be considered a null input for the purposes of expansion. 
     The methods mentioned above may be implemented with software or hardware, or a combination of hardware and software. In one embodiment, the method is implemented by an operating system. As such, the method may be implemented during any program or application running in conjunction with the operating system. That is, expansion can occur in any program or application. By way of example, the operating system may correspond to Mac OS, OS/2, DOS, Unix, Linux, Palm OS, and the like. The operating system can also be a special purpose operating system, such as may be used for limited purpose appliance-type computing devices. Operating systems are generally well known and will not be described in greater detail. 
       FIG. 21  is a proximity method  850 , in accordance with one embodiment of the present invention. The method begins at block  852  where object sensing is performed via a proximity detection system. The object may for example be a finger or stylus. The object is sensed when the object is placed over, but not in contact with a touchscreen display. 
     If an object is sensed, the method proceeds to block  854  where the area near the sensed object is expanded. In particular, a portion of the GUI in the vicinity of the object is visually expanded relative to the remaining portions of the GUI. The touch sensitivity associated with the GUI is also expanded. The expanded area may be expanded immediately or it may appear to gradually grow until it reaches its final shape size, elevation, etc. 
     In most cases, the visually expanded portion is made to appear like it is protruding out of the image plane. The protruding effect is typically accomplished through graphics such as shading or other similar means. The protruding effect may be implemented in a localized area of the GUI or it may be implemented at a particular GUI image such as a control box, tool bar, user interface element, and/or the like. 
     In one embodiment, the expanded portion includes a plateau region and a transition region. During expansion, the target area contained within the plateau region increases in size and magnification. At the same time, the transition region compresses the GUI between the target area contained in the plateau region and the remaining unexpanded portions of the GUI. As a result, the plateau region appears to raise above the remaining portions of the GUI. 
     Following block  854 , the method proceeds to block  856  where a determination is made as to whether or not features are located within the expanded area. The features may be buttons, web links, icons, user interface elements, data entry regions and/or the like. 
     If a feature is located within the expanded area, the method proceeds to block  858  where a determination is made as to whether or not the feature is actuated via a touch event (e.g., selected, activated, etc.). For example, the object changes from hovering over the touch surface of the touchscreen to actually touching the touchscreen. The determination may include monitoring touches that occur after a hover and associating or linking a particular feature to the touching object. The association or link may be made by ranking the relevance of the touching object to the feature. The ranking may for example include producing a figure of merit, and whichever feature has the highest figure of merit, giving it sole access to the events occurring with the touching object. By way of example, the ranking may include calculating the centroid of a touch and its proximity to the feature. 
     If the feature is a user interface element, the feature may be actuated via a touch gesture. See for example, U.S. patent application Ser. No. 10/903,964, which is herein incorporated by reference. If the feature is a data entry feature, the feature may be actuated by entering data as for example through the use of a cursor or keyboard (e.g., word processing). 
     In cases where the expanded area includes a plurality of features, an intermediate block may be included between blocks  856  and  858 . The intermediate block includes providing feedback as to which feature is the most likely selectable feature based on some predefined criteria (the feedback indicates where a system thinks the user is targeting). The criteria may for example be based on the location of the spaced away object relative the location of the various features. For example, the feature located closest to the object may indicate that it is the most likely candidate for selection. In essence, the feedback is a confirmation of correct targeting before selection. If the user does not get the right feedback, the user has the option of moving their finger to another location. The feedback may be visual or auditory. By way of example, visual feedback may include modifying the feature such as changing its color, position, size, shape, symbol, etc., and auditory indication may include providing sounds associated with the feature. 
     Once the feature is actuated, the method proceeds to block  860  where an action associated with the feature is performed. The action may for example include launching a particular program, opening a file or document, viewing a menu, making a selection, executing instructions, generating control signals, and the like. 
     If the feature is not actuated or if there is no feature located within the expanded area, the method proceeds to block  862  where a determination is made as to whether or not the object (finger) is moving in the sensing field of the proximity detector. For example, if the object is stationary in the sensing field or whether the object is being moved about the sending field. 
     If the object is moving, the method proceeds to block  864  where the expanded area is moved in accordance with the location of the moving object. That is, the expanded area follows the motion of the object. 
     If it is determined that the object is not moving, the method proceeds to block  866  where a determination is made as whether or not the object is still sensed. If so, the method proceeds to block  868  where the present expanded area is maintained. Thereafter, the method proceeds back to block  856 . If the object is not sensed, the method proceeds to block  870  where the expanded area is reduced to its normal state. The reduction may mimic the expansion, but in a reverse direction. By way of example, in embodiments where the expanded portion includes a plateau region and a transition region, the target area contained within the plateau region may be decreased in size and magnification. At the same time, the transition region may decompress the GUI between the target area contained in the plateau region and the remaining unexpanded portions of the GUI. As a result, the plateau region appears to integrate back into the remaining portions of the GUI. Furthermore, the reduction may occur immediately after the object is not sensed or after some predetermined amount of time. 
       FIG. 22  is a proximity gesture method  900 , in accordance with one embodiment of the present invention. The method generally starts at block  902  where a proximity sensing field is provided. The proximity field may be a single node proximity field or a pixilated array of sensing nodes. 
     The method proceeds to block  904  where disturbances or changes in the sensing field are monitored. For example, the time between disturbances (tap) and/or the time of the disturbances (lag) and/or the location of distinct disturbances (first tap, second tap), varying locations of a single disturbance (tracking), etc. are monitored. A disturbance being associated with when an object is detected. 
     Thereafter in block  906 , one or more proximity gestures are identified based on the characteristics of the disturbances, i.e., the amount of time the finger hovers, the number of taps, the length of time between taps, etc. 
     Thereafter in block  908 , one or more actions are performed based on the identified proximity gestures. 
     The proximity gestures may be similar to touch gestures except that no touch occurs. The finger or hand gesture is performed above the surface and thus there is no contact. Some examples of touch gestures that may be applied to proximity gestures can be found in U.S. patent application Ser. Nos. 10/903,964 and 11/038,590, which are herein incorporated by reference. 
       FIG. 23  is a block diagram of an exemplary computer system  950 , in accordance with one embodiment of the present invention. The computer system  950  may correspond to a personal computer, such as a desktop, laptop, tablet or handheld computer. The computer system may also correspond to other types of computing devices such as a cell phones, PDAs, media players, consumer electronic devices, and/or the like. 
     The exemplary computer system  950  shown in  FIG. 23  includes a processor  956  configured to execute instructions and to carry out operations associated with the computer system  950 . For example, using instructions retrieved for example from memory, the processor  956  may control the reception and manipulation of input and output data between components of the computing system  950 . The processor  956  can be implemented on a single-chip, multiple chips or multiple electrical components. For example, various architectures can be used for the processor  956 , including dedicated or embedded processor, single purpose processor, controller, ASIC, and so forth. 
     In most cases, the processor  956  together with an operating system operates to execute computer code and produce and use data. By way of example, the operating system may correspond to Mac OS, OS/2, DOS, Unix, Linux, Palm OS, and the like. The operating system can also be a special purpose operating system, such as may be used for limited purpose appliance-type computing devices. The operating system, other computer code and data may reside within a memory block  658  that is operatively coupled to the processor  656 . Memory block  658  generally provides a place to store computer code and data that are used by the computer system  950 . By way of example, the memory block  658  may include Read-Only Memory (ROM), Random-Access Memory (RAM), hard disk drive and/or the like. The information could also reside on a removable storage medium and loaded or installed onto the computer system  650  when needed. Removable storage media include, for example, CD-ROM, PC-CARD, memory card, floppy disk, magnetic tape, and a network component. 
     The computer system  950  also includes a display device  968  that is operatively coupled to the processor  956 . The display device  968  may be a liquid crystal display (LCD) (e.g., active matrix, passive matrix and the like). Alternatively, the display device  968  may be a monitor such as a monochrome display, color graphics adapter (CGA) display, enhanced graphics adapter (EGA) display, variable-graphics-array (VGA) display, super VGA display, cathode ray tube (CRT), and the like. The display device may also correspond to a plasma display or a display implemented with electronic inks or OLEDs. 
     The display device  968  is generally configured to display a graphical user interface (GUI) that provides an easy to use interface between a user of the computer system and the operating system or application running thereon. Generally speaking, the GUI represents, programs, files and operational options with graphical images. The graphical images may include windows, fields, dialog boxes, menus, icons, buttons, cursors, scroll bars, etc. Such images may be arranged in predefined layouts, or may be created dynamically to serve the specific actions being taken by a user. During operation, the user can select and activate various graphical images in order to initiate functions and tasks associated therewith. By way of example, a user may select a button that opens, closes, minimizes, or maximizes a window, or an icon that launches a particular program. The GUI can additionally or alternatively display information, such as non interactive text and graphics, for the user on the display device  968 . 
     The computer system  950  also includes an input device  970  that is operatively coupled to the processor  956 . The input device  970  is configured to transfer data from the outside world into the computer system  950 . The input device  970  may include a touch sensing device configured to receive input from a user&#39;s touch and to send this information to the processor  956 . In many cases, the touch-sensing device recognizes touches, as well as the position and magnitude of touches on a touch sensitive surface. The touch sensing means reports the touches to the processor  956  and the processor  956  interprets the touches in accordance with its programming. For example, the processor  956  may initiate a task in accordance with a particular touch. A dedicated processor can be used to process touches locally and reduce demand for the main processor of the computer system. The touch sensing device may be based on sensing technologies including but not limited to capacitive sensing, resistive sensing, surface acoustic wave sensing, pressure sensing, optical sensing, and/or the like. Furthermore, the touch sensing means may be based on single point sensing or multipoint sensing. Single point sensing is capable of only distinguishing a single touch, while multipoint sensing is capable of distinguishing multiple touches that occur at the same time. 
     In the illustrated embodiment, the input device  970  is a touch screen that is positioned over or in front of the display  968 . The touch screen  670  may be integrated with the display device  968  or it may be a separate component. The touch screen  970  has several advantages over other input technologies such as touchpads, mice, etc. For one, the touch screen  670  is positioned in front of the display  968  and therefore the user can manipulate the GUI directly. For example, the user can simply place their finger over an object to be selected, activated, controlled, etc. In touch pads, there is no one-to-one relationship such as this. With touchpads, the touchpad is placed away from the display typically in a different plane. For example, the display is typically located in a vertical plane and the touchpad is typically located in a horizontal plane. This makes its use less intuitive, and therefore more difficult when compared to touch screens. 
     The touchscreen can be a single point or multipoint touchscreen. Multipoint input devices have advantages over conventional single point devices in that they can distinguish more than one object (finger) simultaneously. Single point devices are simply incapable of distinguishing multiple objects at the same time. By way of example, a multipoint touch screen, which can be used herein, is shown and described in greater detail in copending and commonly assigned U.S. patent application Ser. No. 10/840,862, which is hereby incorporated herein by reference. 
     The computer system  950  also includes a proximity detection system  990  that is operatively coupled to the processor  956 . The proximity detection system  990  is configured to detect when a finger (or stylus) is in close proximity to (but not in contact with) some component of the computer system including for example housing or I/O devices such as the display and touch screen. The proximity detection system  990  may be widely varied. For example, it may be based on sensing technologies including capacitive, electric field, inductive, hall effect, reed, eddy current, magneto resistive, optical shadow, optical visual light, optical IR, optical color recognition, ultrasonic, acoustic emission, radar, heat, sonar, conductive or resistive and the like. A few of these technologies will now be briefly described. 
     The computer system  950  also includes capabilities for coupling to one or more I/O devices  980 . By way of example, the I/O devices  980  may correspond to keyboards, printers, scanners, cameras, speakers, and/or the like. The I/O devices  980  may be integrated with the computer system  950  or they may be separate components (e.g., peripheral devices). In some cases, the I/O devices  980  may be connected to the computer system  950  through wired connections (e.g., cables/ports). In other cases, the I/O devices  980  may be connected to the computer system  950  through wireless connections. By way of example, the data link may correspond to PS/2, USB, IR, RF, Bluetooth or the like. 
     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.