Abstract:
A mobile terminal which includes a touch-screen display method thereof are provided. The mobile terminal includes a touch-screen display; a camera configured to capture image data; a sensing unit located in a corresponding area of the camera; and a controller configured to: receive a first touch gesture in the corresponding area of the camera, turn on the camera in response to the received first touch gesture and display a preview image on the touch-screen display, receive a second touch gestures in the corresponding area of the camera, said first touch gesture being different than the second touch gesture, and capture the image data in response to the second touch gesture, wherein the camera and the sensing unit are mounted on an area of the mobile terminal that excludes the touch-screen display.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of U.S. patent application Ser. No. 12/466,619 filed May 15, 2009, which claims priority to Korea Patent Application No. 10-2008-0119541 filed on Nov. 28, 2008, the entire contents of all which are hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to control of input/output through a touch, and more particularly, to a mobile terminal capable of easily controlling input/output through a touch and an input/output controlling method thereof. 
     A recent terminal such as a personal computer, a notebook computer or a cellular phone has a variety of functions, and thus the terminal is constructed in the form of a multimedia player having various functions of photographing pictures or moving images, playing music or moving image files, playing games, receiving broadcasting programs and so on. 
     The terminal has an input/output device for inputting and outputting data in order to perform the aforementioned various functions. The input/output device includes a plurality of input/output units for inputting and outputting data such as audio data, video data and text data. 
     A user controls an input or output operation of each of the plurality of input/output units of the terminal in such a manner that the user operates an input unit such as a key button or a touch screen and applies a control command corresponding to the operation to the terminal. 
     However, it is required for the user to perform a complicated key operation or menu operation in order to execute the various functions and control the input/output units only through the touch screen or a key input unit. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a mobile terminal capable of controlling input/output of information thereto/therefrom according to a touch operation in a convenient and intuitive manner and an input/output controlling method thereof. 
     According to an aspect of the present invention, there is provided a mobile terminal comprising at least one input/output unit for inputting and/or outputting information; a sensing unit for sensing a touch of the at least one input/output unit or the neighborhood of the at least one input/output unit; and a controller for performing a predetermined input/output control operation with respect to the input/output unit according to an input operation including the touch of the at least one input/output unit or the neighborhood of the at least one input/output unit. 
     The touch may include at least one of a contact touch and a proximity touch of the at least one input/output unit or the neighborhood of the at least one input/output unit. 
     When at least two input/output units or the neighborhoods of the at least two input/output units are touched within a predetermined period, the controller may perform a predetermined input/output control operation with respect to at least one of the at least two input/output units. 
     The mobile terminal may further comprise a touch screen functioning as an output device and an input device and the input operation may include a touch of the at least one input/output unit and a touch of the touch screen, which are performed within a predetermined period. 
     The controller may confirm whether to perform the predetermined input/output control operation through the touch screen when the input operation is sensed through the sensing unit. 
     The input/output control operation performed by the controller may include an input/output control operation with respect to the touch screen. 
     The controller may perform the predetermined input/output control operation with respect to the input/output unit according to an operating state of the controller at the time when the input operation is carried out. 
     The touch may include at least one of at least one touch of the at least one input/output unit or the neighborhood of the at least one input/output unit, a touch continued for longer than a predetermined period, and a drag performed in a predetermined form. 
     The mobile terminal may further comprise at least one light-emitting device that is respectively attached to the at least one input/output unit or the neighborhood of the at least one input/output unit and can be independently controlled to emit light in at least one color, and the controller may control the at least one light-emitting device attached to the at least one input/output unit or the neighborhood of the at least one input/output unit to indicate an operating state according to the input/output control operation with respect to the at least one input/output unit. 
     The controller may control at least one of the light-emitting area of the at least one light-emitting device and the color of light emitted from the at least one light-emitting device according to the operating state based on the input/output control operation with respect to the at least one input/output unit. 
     When at least two input/output units or the neighborhoods of the at least two input/output units are touched within a predetermined period, the controller may perform different input/output control operations according to the order of the touches. 
     The controller may control input/output of information to/from the mobile terminal through the input/output unit to perform the input/output control operation with respect to the input/output unit. 
     According to another aspect of the present invention, there is provided a method of controlling input/output of a mobile terminal, comprising the steps of sensing an input operation including a touch of at least one input/output unit for inputting or outputting information or the neighborhood of the at least one input/output unit; and controlling a predetermined input/output operation with respect to the input/output unit according to the input operation. 
     According to the mobile terminal and the controlling method thereof according to the present invention, input/output of data to/from the mobile terminal can be easily controlled according to touches of various input/output units included in the mobile terminal. 
     Furthermore, the present invention can directly control input/output of data through a contact touch or a proximity touch of an input/output unit without searching a menu structure through the touch screen or operating a key button through the key input unit such that a user can conveniently use the mobile terminal. 
     Moreover, the user can easily recognize operating states of the input/output units according to input/output control. 
     In addition, an additional key button for controlling input/output is not required because input/output control can be performed through a touch of an input/output unit, and thus there is much latitude of choice of design of the exterior of the mobile terminal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: 
         FIG. 1  is a block diagram of a mobile terminal according to an embodiment of the present invention; 
         FIG. 2A  is a front perspective view of a handheld terminal according to an embodiment of the present invention; 
         FIG. 2B  is a rear perspective view of the handheld terminal according to an embodiment of the present invention; 
         FIGS. 3A and 3B  are front views of the handheld terminal for explaining an operation of the handheld terminal according to an embodiment of the present invention; 
         FIG. 4  is a conceptional view for explaining a proximity depth of a proximity sensor; 
         FIGS. 5 through 10  are views for explaining an input/output controlling method of a mobile terminal according to a first embodiment of the present invention; 
         FIGS. 11 through 19  are views for explaining an input/output controlling method of a mobile terminal according to a second embodiment of the present invention; 
         FIGS. 20, 21 and 22  are views for explaining an input/output controlling method of a mobile terminal according to a third embodiment of the present invention; and 
         FIGS. 23 through 28  are views for explaining an input/output controlling method of a mobile terminal according to a fourth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, there embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. 
     Hereinafter, a mobile terminal relating to the present invention will be described below in more detail with reference to the accompanying drawings. In the following description, suffixes “module” and “unit” are given to components of the mobile terminal in consideration of only facilitation of description and do not have meanings or functions discriminated from each other. 
     The mobile terminal described in the specification can include a cellular phone, a smart phone, a laptop computer, a digital broadcasting terminal, personal digital assistants (PDA), a portable multimedia player (PMP), a navigation system and so on. 
       FIG. 1  is a block diagram of a mobile terminal  100  according to an embodiment of the present invention. 
     The mobile terminal  100  can include a radio communication unit  110 , an audio/video (A/V) input unit  120 , a user input unit  130 , a sensing unit  140 , an output unit  150 , a memory  160 , an interface  170 , a controller  180 , and a power supply  190 . The components shown in  FIG. 1  are not essential parts and the number of components included in the mobile terminal can be varied. 
     The components of the mobile terminal will now be described. 
     The radio communication unit  110  can include at least one module that enables radio communication between the mobile terminal  100  and a radio communication system or between the mobile terminal  100  and a network in which the mobile terminal  100  is located. For example, the radio communication unit  110  can include a broadcasting receiving module  111 , a mobile communication module  112 , a wireless Internet module  113 , a local area communication module  114  and a position information module  115 . 
     The broadcasting receiving module  111  receives broadcasting signals and/or broadcasting related information from an external broadcasting management server through a broadcasting channel. 
     The broadcasting channel can include a satellite channel and a terrestrial channel. The broadcasting management server can be a server that generates and transmits broadcasting signals and/or broadcasting related information or a server that receives previously created broadcasting signals and/or broadcasting related information and transmits the broadcasting signals and/or broadcasting related information to a terminal. The broadcasting signals can include not only TV broadcasting signals, radio broadcasting signals and data broadcasting signals but also signals in the form of a combination of a TV broadcasting signal and a radio broadcasting signal. 
     The broadcasting related information can be information on a broadcasting channel, a broadcasting program or a broadcasting service provider. The broadcasting related information can be provided even through a mobile communication network. In this case, the broadcasting related information can be received by the mobile communication module  112 . 
     The broadcasting related information can exist in various forms. For example, the broadcasting related information can exist in the form of electronic program guide (EPG) of digital multimedia broadcasting (DMB) or in the form of electronic service guide (ESG) of digital video broadcast-handheld (DVB-H). 
     The broadcasting receiving module  111  receives broadcasting signals using various broadcasting systems. Particularly, the broadcasting receiving module  111  can receive digital broadcasting signals using digital broadcasting systems such as digital multimedia broadcasting-terrestrial (DMB-T), digital multimedia broadcasting-satellite (DMB-S), media forward link only (MediaFLO), DVB-H and integrated services digital broadcast-terrestrial (ISDB-T) systems. The broadcasting receiving module  111  can be constructed to be suited to broadcasting systems providing broadcasting signals other than the above-described digital broadcasting systems. 
     The broadcasting signals and/or broadcasting related information received through the broadcasting receiving module  111  can be stored in the memory  160 . 
     The mobile communication module  112  transmits/receives a radio signal to/from at least one of a base station, an external terminal, and a server on a mobile communication network. The radio signal can include a voice call signal, a video telephony call signal or data in various forms according to transmission and receiving of text/multimedia messages. 
     The wireless Internet module  113  corresponds to a module for wireless Internet access and can be included in the mobile terminal  100  or externally attached to the mobile terminal  100 ). Wireless LAN (WLAN) (Wi-Fi), wireless broadband (Wibro), world interoperability for microwave access (Wimax), high speed downlink packet access (HSDPA) and so on can be used as a wireless Internet technique. 
     The local area communication module  114  corresponds to a module for local area communication. Bluetooth, radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB) and ZigBee can be used as a local area communication technique. 
     The position information module  115  confirms or obtains the position of the mobile terminal  100 . A global positioning system (GPS) module is a representative example of the position information module  115 . According to the current technology, the GPS module  115  can calculate information on distances between one point (object) and at least three satellites and information on the time when the distance information is measured and apply trigonometry to the obtained distance information to obtain three-dimensional position information on the point (object) according to latitude, longitude and altitude at a predetermined time. Furthermore, a method of calculating position and time information using three satellites and correcting the calculated position and time information using another satellite is also used. In addition, the GPS module  115  continuously calculates the current position in real time and calculates velocity information using the position information. 
     Referring to  FIG. 1 , the A/V input unit  120  is used to input an audio signal or a video signal and can include a camera  121  and a microphone  122 . The camera  121  processes image frames of still images or moving images obtained by an image sensor in a video telephony mode or a photographing mode. The processed image frames can be displayed on a display unit  151 . 
     The image frames processed by the camera  121  can be stored in the memory  160  or transmitted to an external device through the radio communication unit  110 . The mobile terminal  100  can include at least two cameras according to constitution of the terminal. 
     The microphone  122  receives an external audio signal in a call mode, a recording mode or a speed recognition mode and processes the received audio signal into electric audio data. The audio data can be converted into a form that can be transmitted to a mobile communication base station through the mobile communication module  112  and output in the call mode. The microphone  122  can employ various noise removal algorithms for removing noise generated when the external audio signal is received. 
     The user input unit  130  receives input data for controlling the operation of the terminal from a user. The user input unit  130  can include a keypad, a dome switch, a touch pad (constant voltage/capacitance), jog wheel, jog switch and so on. 
     The sensing unit  140  senses the current state of the mobile terminal  100 , such as open/close state of the mobile terminal  100 , the position of the mobile terminal  100 , whether a user touches the mobile terminal  100 , the direction of the mobile terminal  100  and acceleration/deceleration of the mobile terminal  100  and generates a detection signal for controlling the operation of the mobile terminal  100 . For example, the sensing unit  140  can sense whether a slide phone is opened or closed when the mobile terminal  100  is the slide phone. Furthermore, the sensing unit  140  can sense whether the power supply  190  supplies power and whether the interface  170  is connected to an external device. The sensing unit  140  can include a proximity sensor. 
     The output unit  150  generates visual, auditory or tactile output and can include the display unit  151 , an audio output module  152 , an alarm  153  and a haptic module  154 . 
     The display unit  151  displays information processed by the mobile terminal  100 . For example, the display unit  151  displays UI or graphic user interface (GUI) related to a telephone call when the mobile terminal is in the call mode. The display unit  151  displays a captured or/and received image, UI or GUI when the mobile terminal  100  is in the video telephony mode or the photographing mode. 
     The display unit  151  can include at least one of a liquid crystal display, a thin film transistor liquid crystal display, an organic light-emitting diode display, a flexible display and a three-dimensional display. 
     Some of these displays can be of a transparent type or a light transmission type. This can be referred to as a transparent display. The transparent display includes a transparent liquid crystal display. The rear structure of the display unit  151  can also be of the light transmission type. According to this structure, a user can see an object located behind the body of the mobile terminal  100  through an area of the body of the mobile terminal  100 , which is occupied by the display unit  151 . 
     The mobile terminal  100  can include at least two display units  151  according to constitution of the terminal. For example, the mobile terminal  100  can include a plurality of displays that are arranged on a single face at a predetermined distance or integrated. Otherwise, the plurality of displays can be arranged on different sides. 
     In the case where the display unit  151  and a sensor sensing touch (referred to as a touch sensor hereinafter) form a layered structure, which is referred to as a touch screen hereinafter, the display unit  151  can be used as an input device in addition to an output device. The touch sensor can be in the form of a touch film, a touch sheet and a touch pad, for example. 
     The touch sensor can be constructed such that it converts a variation in pressure applied to a specific portion of the display unit  151  or a variation in capacitance generated at a specific portion of the display unit  151  into an electric input signal. The touch sensor can be constructed such that it can sense pressure of touch as well as the position and area of touch. 
     When touch input is applied to the touch sensor, a signal corresponding to the touch input is transmitted to a touch controller. The touch controller processes the signal and transmits data corresponding to the processed signal to the controller  180 . Accordingly, the controller  180  can detect a touched portion of the display  151 . 
     Referring to  FIG. 1 , the proximity sensor  141  can be located in an internal region of the mobile terminal, surrounded by the touch screen, or near the touch screen. The proximity sensor senses an object approaching a predetermined sensing face or an object located near the proximity sensor using electromagnetic force or infrared rays without having mechanical contact. 
     The proximity sensor has lifetime longer than that of a contact sensor and has wide application. The proximity sensor includes a transmission type photo-electric sensor, a direct reflection type photo-electric sensor, a mirror reflection type photo-electric sensor, a high-frequency oscillating proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, an infrared proximity sensor, etc. 
     A capacitive touch screen is constructed such that proximity of a pointer is detected through a variation in an electric field according to the proximity of the pointer. In this case, the touch screen (touch sensor) can be classified as a proximity sensor. 
     For convenience of explanation, an action of approaching the pointer to the touch screen while the pointer it not being in contact with the touch screen such that location of the pointer on the touch screen is recognized is referred to as “proximity touch” and an action of bring the pointer into contact with the touch screen is referred to as “contact touch” in the following description. A proximity touch point of the pointer on the touch screen means a point of the touch screen to which the pointer corresponds perpendicularly to the touch screen when the pointer proximity-touches the touch screen. 
     The proximity sensor senses proximity touch and a proximity touch pattern (for example, a proximity touch distance, a proximity touch direction, a proximity touch velocity, a proximity touch time, a proximity touch position, a proximity touch moving state, etc.). Information corresponding to the sensed proximity touch action and proximity touch pattern can be displayed on the touch screen. 
     The audio output module  152  can output audio data received from the radio communication unit  110  or stored in the memory  160  in a call signal receiving mode, a telephone call mode or a recording mode, a speech recognition mode and a broadcasting receiving mode. The audio output module  152  outputs audio signals related to functions (for example, a call signal incoming tone, a message incoming tone, etc.) performed in the mobile terminal  100 . The audio output module  152  can include a receiver, a speaker, a buzzer, etc. 
     The alarm  153  outputs a signal for indicating generation of an event of the mobile terminal  100 . Examples of events generated in the mobile terminal include receiving of a call signal, receiving of a message, input of a key signal, input of touch, etc. The alarm  153  can output signals in forms different from video signals or audio signals, for example, a signal for indicating generation of an event through vibration. The video signals or the audio signals can be also output through the display unit  151  or the audio output module  152 . 
     The haptic module  154  generates various haptic effects that the user can feel. A representative example of the haptic effects is vibration. The intensity and pattern of vibration generated by the haptic module  154  can be controlled. For example, different vibrations can be combined and output or sequentially output. 
     The haptic module  154  can generate a variety of haptic effects including an effect of stimulus according to arrangement of pins vertically moving for a contact skin face, an effect of stimulus according to jet force or sucking force of air through a jet hole or a sucking hole, an effect of stimulus rubbing the skin, an effect of stimulus according to contact of an electrode, an effect of stimulus using electrostatic force and an effect according to reproduction of cold and warmth using an element capable of absorbing or radiating heat in addition to vibrations. 
     The haptic module  154  can not only transmit haptic effects through direct contact but also allow the user to feel haptic effects through kinesthetic sense of his fingers or arms. The mobile terminal  100  can include at least two haptic modules  154  according to constitution of the mobile terminal. 
     The memory  160  can store a program for the operation of the controller  180  and temporarily store input/output data (for example, phone book, messages, still images, moving images, etc.). The memory  160  can store data about vibrations and sounds in various patterns, which are output from when a touch input is applied to the touch screen. 
     The memory  160  can include at least one of a flash memory, a hard disk type memory, a multimedia card micro type memory, a card type memory (for example, SD or XD memory), a random access memory (RAM), a static RAM (SRAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a programmable ROM (PROM) magnetic memory, a magnetic disk and an optical disk. The mobile terminal  100  can operate in relation to a web storage performing the storing function of the memory  160  on the Internet. 
     The interface  170  serves as a path to all external devices connected to the mobile terminal  100 . The interface  170  receives data from the external devices or power and transmits the data or power to the internal components of the mobile terminal  100  or transmits data of the mobile terminal  100  to the external devices. 
     The interface  170  can include a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for connecting a device having a user identification module, an audio I/O port, a video I/O port, an earphone port, etc., for example. 
     An identification module is a chip that stores information for authenticating the authority to use the mobile terminal  100  and can include a user identify module (UIM), a subscriber identify module (SIM) and a universal subscriber identify module (USIM). A device (referred to as an identification device hereinafter) including the identification module can be manufactured in the form of a smart card. Accordingly, the identification device can be connected to the mobile terminal  100  through a port. 
     The interface  170  can serve as a path through which power from an external cradle is provided to the mobile terminal  100  when the mobile terminal  100  is connected to the external cradle or a path through which various command signals inputted by the user through the cradle to the mobile terminal  100 . The various command signals or power input from the cradle can be used as a signal for confirming whether the mobile terminal  100  is correctly set in the cradle. 
     The controller  180  controls the overall operation of the mobile terminal. For example, the controller  180  performs control and processing for voice communication, data communication and video telephony. The controller  180  can include a multimedia module  181  for playing multimedia. The multimedia module  181  can be included in the controller  180  or separated from the controller  180 . 
     The controller  180  can perform a pattern recognition process capable of recognizing handwriting input or picture-drawing input applied to the touch screen as characters or images. 
     The power supply  190  receives external power and internal power and provides power required for the operations of the components of the mobile terminal under the control of the controller  180 . 
     Various embodiments of the present invention can be implemented in a computer or similar device readable recording medium using software, hardware or a combination thereof, for example. 
     According to hardware implementation, the embodiments of the present invention can be implemented using at least one of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, electrical units for executing functions. In some cases, the embodiments can be implemented by the controller  180 . 
     According to software implementation, embodiments such as procedures or functions can be implemented with a separate software module executing at least one function or operation. Software codes can be implemented according to a software application written in an appropriate software language. Furthermore, the software codes can be stored in the memory  160  and executed by the controller  180 . 
       FIG. 2A  is a front perspective view of a mobile terminal or a handheld terminal  100  according to an embodiment of the present invention. 
     The handheld terminal  100  has a bar type terminal body. However, the present invention is not limited to a bar type terminal and can be applied to terminals of various types including slide type, folder type, swing type and swivel type terminals having at least two bodies that are relatively movably combined. 
     The terminal body includes a case (a casing, a housing, a cover, etc.) forming the exterior of the terminal  100 . In the present embodiment, the case can be divided into a front case  101  and a rear case  102 . Various electronic components are arranged in the space formed between the front case  101  and the rear case  102 . At least one middle case can be additionally arranged between the front case  101  and the rear case  102 . 
     The cases can be formed of plastics through injection molding or made of a metal material such as stainless steel (STS) or titanium (Ti). 
     The display unit  151 , the audio output unit  152 , the camera  121 , the user input unit  130 / 131  and  132 , the microphone  122  and the interface  170  can be arranged in the terminal body, specifically, in the front case  101 . 
     The display unit  151  occupies most part of the main face of the front case  101 . The audio output unit  152  and the camera  121  are arranged in a region in proximity to one of both ends of the display unit  151  and the user input unit  131  and the microphone  122  are located in a region in proximity to the other end of the display unit  151 . The user input unit  132  and the interface  170  are arranged on the sides of the front case  101  and the rear case  102 . 
     The user input unit  130  is operated to receive commands for controlling the operation of the handheld terminal  100  and can include a plurality of operating units  131  and  132 . The operating units  131  and  132  can be referred to as manipulating portions and employ any tactile manner in which a user operates the operating units  131  and  132  while having tactile feeling. 
     First and second operating units  116  and  117  can receive various inputs. For example, the first operating unit  116  receives commands such as start, end and scroll and the second operating unit  117  receives commands such as control of the volume of sound output from the audio output unit  152  or conversion of the display unit  151  to a touch recognition mode. 
       FIG. 2B  is a rear perspective view of the handheld terminal shown in  FIG. 2A  according to an embodiment of the present invention. 
     Referring to  FIG. 2B , a camera  121 ′ can be additionally attached to the rear side of the terminal body, that is, the rear case  102 . The camera  121 ′ has a photographing direction opposite to that of the camera  121  shown in  FIG. 2A  and can have pixels different from those of the camera  121  shown in  FIG. 2A . 
     For example, it is desirable that the camera  121  has low pixels such that it can capture an image of the face of a user and transmit the image to a receiving part in case of video telephony while the camera  121 ′ has high pixels because it captures an image of a general object and does not immediately transmit the image in many cases. The cameras  121  and  121 ′ can be attached to the terminal body such that they can be rotated or pop-up. 
     A flash bulb  123  and a mirror  124  are additionally arranged in proximity to the camera  121 ′. The flash bulb  123  lights an object when the camera  121 ′ takes a picture of the object. The mirror  124  is used for the user to look at his/her face in the mirror when the user wants to self-photograph himself/herself using the camera  121 ′. 
     An audio output unit  152 ′ can be additionally provided on the rear side of the terminal body. The audio output unit  152 ′ can achieve a stereo function with the audio output unit  152  shown in  FIG. 2A  and be used for a speaker phone mode when the terminal is used for a telephone call. 
     A broadcasting signal receiving antenna  124  can be additionally attached to the side of the terminal body in addition to an antenna for telephone calls. The antenna  124  constructing a part of the broadcasting receiving module  111  shown in  FIG. 1  can be set in the terminal body such that the antenna  124  can be pulled out of the terminal body. 
     The power supply  190  for providing power to the handheld terminal  100  is set in the terminal body. The power supply  190  can be included in the terminal body or detachably attached to the terminal body. 
     A touch pad  135  for sensing touch can be additionally attached to the rear case  102 . The touch pad  135  can be of a light transmission type as the display unit  151 . In this case, if the display unit  151  outputs visual information through both sides thereof, the visual information can be recognized through the touch pad  135 . The information output through both sides of the display unit  151  can be controlled by the touch pad  135 . Otherwise, a display is additionally attached to the touch pad  135  such that a touch screen can be arranged even in the rear case  102 . 
     The touch pad  135  operates in connection with the display unit  151  of the front case  101 . The touch pad  135  can be located in parallel with the display unit  151  behind the display unit  151 . The touch panel  135  can be identical to or smaller than the display unit  151  in size. 
     Interoperations of the display unit  151  and the touch pad  135  will now be described with reference to  FIGS. 3A and 3B . 
       FIGS. 3A and 3B  are front views of the handheld terminal  100  for explaining an operating state of the handheld terminal according to an embodiment of the present invention. 
     The display unit  151  can display various types of visual information in the form of characters, numerals, symbols, graphic or icons. To input the information, at least one of the characters, numerals, symbols, graphic and icons are displayed in predetermined arrangement in the form of a keypad. This keypad can be referred to as a ‘soft key’. 
       FIG. 3A  shows that touch applied to a soft key is input through the front side of the terminal body. 
     The display unit  151  can be operated through the overall area thereof. Otherwise, the display unit  151  can be divided into a plurality of regions and operated. In the latter case, the display unit  151  can be constructed such that the plurality of regions interoperate. 
     For example, an output window  151   a  and an input window  151   b  are respectively displayed in upper and lower parts of the display unit  151 . The input window  151   b  displays soft keys  151   c  that represent numerals used to input numbers such as telephone numbers. When a soft key  151   c  is touched, a numeral corresponding to the touched soft key is displayed on the output window  151   a . When the user operates the first operating unit  116 , connection of a call corresponding to a telephone number displayed on the output window  151   a  is attempted. 
       FIG. 3B  shows that touch applied to soft keys is input through the rear side of the terminal body.  FIG. 3B  shows the landscape of the terminal body while  FIG. 3A  shows the portrait of the terminal body. The display unit  151  can be constructed such that an output image is converted according to the direction in which the terminal body is located. 
       FIG. 3B  shows the operation of the handheld terminal in a text input mode. The display unit  151  displays an output window  135   a  and an input window  135   b . A plurality of soft keys  135   c  that indicate at least one of characters, symbols and numerals can be arranged in the input window  135   b . The soft keys  135   c  can be arranged in the form of qwerty keys. 
     When soft keys  135   c  are touched through the touch pad  135 , characters, numerals and symbols corresponding to the touched soft keys  135   c  are displayed on the output window  135   a . Touch input through the touch pad  135  can prevent the soft keys  135   c  from being covered with user&#39;s fingers when the soft keys  135   c  are touched as compared to touch input through the display unit  151 . When the display unit  151  and the touch pad  135  are transparent, fingers located behind the terminal body can be confirmed with the naked eye, and thus touch input can be performed more correctly. 
     The display unit  151  or the touch pad  135  can be constructed such that it receives touch input in a scroll manner. The user can scroll the display unit  151  or the touch pad  135  to move an object displayed on the display unit  151 , for example, a cursor or a pointer located on an icon. Furthermore, when a finger moves on the display unit  151  or the touch pad  135 , the finger moving path can be visually displayed on the display unit  151 . This will be useful to edit an image displayed on the display unit  151 . 
     For a case where the display unit  151  (touch screen) and the touch pad  135  are simultaneously touched in a predetermined period of time, a specific function of the terminal can be executed. The case can include a case that the user clamps the terminal body using the thumb and the index finger. The specific function can include activation or inactivation of the display unit  151  or the touch pad  135 , for example. 
     The proximity sensor described with reference to  FIG. 1  will now be explained in more detail with reference to  FIG. 4 . 
       FIG. 4  is a conceptional view for explaining a proximity depth of the proximity sensor. 
     As shown in  FIG. 4 , when a pointer such as a user&#39;s finger approaches the touch screen, the proximity sensor located inside or near the touch screen senses the approach and outputs a proximity signal. 
     The proximity sensor can be constructed such that it outputs a proximity signal according to the distance between the pointer approaching the touch screen and the touch screen (referred to as “proximity depth”). 
     The distance in which the proximity signal is output when the pointer approaches the touch screen is referred to as a detection distance. The proximity depth can be known by using a plurality of proximity sensors having different detection distances and comparing proximity signals respectively output from the proximity sensors. 
       FIG. 4  shows the section of the touch screen in which proximity sensors capable of sensing three proximity depths are arranged. Proximity sensors capable of sensing less than three or more than four proximity depths can be arranged in the touch screen. 
     Specifically, when the pointer completely comes into contact with the touch screen (D0), it is recognized as contact touch. When the pointer is located within a distance D1 from the touch screen, it is recognized as proximity touch of a first proximity depth. When the pointer is located in a range between the distance D1 and a distance D2 from the touch screen, it is recognized as proximity touch of a second proximity depth. When the pointer is located in a range between the distance D2 and a distance D3 from the touch screen, it is recognized as proximity touch of a third proximity depth. When the pointer is located at longer than the distance D3 from the touch screen, it is recognized as cancellation of proximity touch. 
     Accordingly, the controller  180  can recognize the proximity touch as various input signals according to the proximity distance and proximity position of the pointer with respect to the touch screen and perform various operation controls according to the input signals. 
     Embodiments of the present invention will be explained. It is assumed that the display unit  151  is a touch screen in the embodiments of the present invention for convenience of explanation. A touch includes both a proximity touch and a direct touch in the following description. Furthermore, touch input includes every possible touch according to variations in the number of touches, duration, behavior and form of a touch, such as various input signals corresponding to touch variations, for example, touch down, touch up, a lapse of predetermined touch duration, drag and drop. 
     In the following embodiments of the present invention, the above-described touch sensor for sensing a contact touch and/or the proximity sensor for sensing a proximity touch are located in the position of each of the input/output units such as the camera  121 , the microphone  122  of the A/V input unit  120  and/or the display unit  151  and the audio output module  152  of the output unit  150  and/or in the neighborhood of the input/output unit, which is close enough to designate the input/output unit according to experiments or experiences. 
     First Embodiment 
     A method of controlling input/output of information according to a touch of an input/output unit of a mobile terminal according to a first embodiment of the present invention will now be explained. 
     According to the first embodiment of the present invention, input/output of the input/output unit is controlled according to a contact touch generated by directly touching the input/output unit or the neighborhood (which includes the position of the input/output unit hereinafter) of the input/output unit in various manners. 
     That is, according to the method of controlling input/output of information according to a touch of the input/output unit of the mobile terminal in accordance with the first embodiment of the present invention, the controller  180  controls the input/output unit when a user touches the neighborhood of the input/output unit in a specific manner. 
       FIGS. 5 through 10  illustrate examples of various touch input methods which can be performed to control input/output of information through a touch of an input/output unit. 
     Control commands respectively corresponding to the touch input methods are previously set, and thus the controller  180  can confirm a control command corresponding to a specific touch input method and control the input/output unit according to the control command. 
     Specifically, a user touches the input/output unit or the neighborhood of the input/output unit in a predetermined manner such that the sensing unit  140  illustrated in  FIG. 1  can sense the touching operation. Then, the sensing unit  140  senses the touching operation, generates a detection signal according to the sensing result and applies the detection signal to the controller  180 . 
     The controller  180  receives the detection signal from the sensing unit  140  according to the touching operation, analyzes the detection signal to detect the input/output unit to be controlled, which corresponds to the detection signal, and a predetermined control command corresponding to the detection signal and controls the input/output unit according to the control command. 
     In the example illustrated in  FIG. 5 , the input/output unit is controlled according to a dragging operation in a specific direction in the neighborhood of the input/output unit. 
     Referring to  FIG. 5 , when the user touches the audio output module  152  among the input/output units of the mobile terminal or the neighborhood of the audio output module  152  through a specific operation, for example, an operation of dragging his or her finger from left to right, the sensing unit  140  senses the touch of the user and applies a predetermined detection signal corresponding to the touch to the controller  180 . 
     The controller  180  receives the detection signal corresponding to the touch on the audio output module  152  from the sensing unit  140 , recognizes that the detection signal relates to the audio output module  152  and the dragging operation from left to right corresponds to a control command “volume-up” and controls the audio output module  152  according to the control command to increase the volume of the audio output module  152 . 
     On the contrary, when the sensing unit  140  senses a drag of the user&#39;s finger from right to left on the audio output module  152  and applies a detection signal corresponding to the sensed drag to the controller  180 , the controller  180  can decrease the volume of the audio output module  152  according to the detection signal. 
     In the example illustrated in  FIG. 6 , the input/output unit is controlled according to the number of times of touching the neighborhood of the input/output unit. 
     Referring to  FIG. 6 , as the number of times of touching the audio output module  152  by the user increases, the controller  180  can increase the volume of the audio output module  152  by a predetermined level whenever the user touches the audio output module  152  once, for example. That is, the controller  180  can control the output level of the input/output unit, such as the volume or brightness of the input/output unit, to be gradually increased as the neighborhood of the input/output unit is repeatedly touched. 
     In the example illustrated in  FIG. 7 , the input/output unit is controlled according to the duration of a touch on the neighborhood of the input/output unit. 
     Referring to  FIG. 7 , when the user touches the neighborhood of the audio output module  152  for a long time to continue the touch, the controller  180  gradually increases the volume of the audio output module  152  for the duration of the touch. 
     In the example illustrated in  FIG. 8 , the input/output unit is controlled in such a manner that the user drags his or her finger in a specific manner in close proximity to the input/output unit. 
     Referring to  FIG. 8 , when the user drags his or her finger clockwise, for example, in close proximity to the audio output module  152 , the controller  180  can gradually increase the volume of the audio output module  152 . On the contrary, the controller  180  can gradually decrease the volume of the audio output module  152  when the user drags his or her finger counterclockwise. 
       FIG. 9  illustrates the example of the first embodiment of the present invention, which is described with reference to  FIG. 5 , in more detail. 
     Referring to  FIG. 9 , the user drags his or her finger from left to right on the audio output module  152  among the input/output units of the mobile terminal or in close proximity to the audio output module  152 . Then, the volume of the audio output module  152  gradually increases as the dragging operation is performed, which is illustrated by left, middle and right images A,  13  and C of  FIG. 9 . 
     That is, the controller  180  can control the output level of the input/output unit, such as the volume of the audio output module  152 , to be gradually increased according to the duration of a finger-dragging operation performed on the audio output module  152  or a degree to which the finger-dragging operation is carried out. 
       FIG. 10  illustrates the example of the first embodiment of the present invention, which is described with reference to  FIG. 8 , in more detail. 
     Referring to  FIG. 10 , the user drags his or her finger from left to right on the microphone  122  among the input/output units of the mobile terminal or in close proximity to the microphone  122 . Then, the output level of the microphone  122  gradually increases as the dragging operation is performed, which is illustrated by left, middle and right images A, B and C of  FIG. 10 . 
     That is, the controller  180  can gradually increase the output level of the microphone  122  according to the duration of a finger-dragging operation performed on the microphone  122  or a degree to which the finger-dragging operation is executed. 
     Second Embodiment 
     A method of controlling input/output in the mobile terminal according to a second embodiment of the present invention will now be explained. 
     The second embodiment of the present invention can perform an operation of controlling input/output of information to/from at least one of at least two input/output units according to touching operations performed on the at least two input/output units. 
     The method of controlling input/output of information in the mobile terminal according to the second embodiment of the present invention can include an input/output controlling operation with respect to a device related to at least one of the at least two touched input/output units in addition to the operation of controlling input/output information to/from the at least one of the at least two touched input/output units. When the audio output module  152  and the touch screen  151  are touched, for example, the input/output controlling method according to the second embodiment of the present invention can include an operation of inputting (recording) audio data to (in) the memory  150  as an input/output controlling operation for executing a recording function related to the audio output module  152 . 
     The order of performing the control operations with respect to the at least two input/output units can be varied according to the order of touching the at least two input/output units. 
     Furthermore, touch inputs applied to the at least two input/output units can be the same touch or different touches in terms of the number of touches, the duration, behavior and form of touches. For example, an input/output unit is touched once, and then another input/output unit is touched once within a predetermined period. Otherwise, an input/output unit is touched, and then a finger-dragging operation is performed on another input/output unit within a predetermined period. 
     Examples of controlling input/output of information to/from the mobile terminal according to combination of a touch of an input/output unit or the neighborhood of the input/output unit and a touch of another input/output unit, for example, the touch screen  151 , will be explained. 
     That is, in the method of controlling input/output of information to/from input/output units of the mobile terminal according to the second embodiment of the present invention, a user can touch the neighborhood of a specific input/output unit and drags the touch to the inside of the touch screen  151  while maintaining the touch or touch the touch screen  151  and drags the touch to the neighborhood of the specific input/output unit. Then, the controller  180  controls a corresponding input/output unit in a predetermined manner corresponding to the aforementioned touch input. 
       FIGS. 11, 12, 13 and 14  illustrate examples of controlling various input/output units of the mobile terminal according to the second embodiment of the present invention. 
     To perform the aforementioned touch input method, it is required to attach a touch sensor or a proximity sensor to each input/output unit or the neighborhood of each input/output unit, as described above. While the touch sensor or the proximity sensor can have a sufficient size such that the touch sensor or the proximity sensor comes in contact with the boundary of the touch screen  151 , the size of the touch sensor or the proximity sensor is not limited thereto and the touch sensor or the proximity sensor can be located apart from the boundary of the touch screen  151 . 
     The controller  180  combines a detection signal received from the sensing unit  140  including the touch sensor or the proximity sensor located in close proximity to an input/output unit and a detection signal received from the touch screen  151  to detect a predetermined control command corresponding to the combined detection signal. 
     In this case, the controller  180  checks the temporal sequence of the detection signal corresponding to touch input applied to the neighborhood of the input/output unit and the detection signal corresponding to touch input applied to the touch screen  151 , the interval of the touch inputs, and the forms of the touch inputs and executes the predetermined control command. 
     For example, when the neighborhood of the input/output unit is touched and then the touch screen  151  is touched within a predetermined period, the controller  180  determines that this touch behavior corresponds to a control command with respect to the input/output unit and combines the forms of the two touch inputs to detect the type of the control command. 
     Referring to  FIG. 11 , the user touches the camera  121  among the input/output units of the mobile terminal or the neighborhood of the camera  121  and drags the touch to the inside of the touch screen  151 . 
     In this case, a detection signal corresponding to the touch input applied to the camera  121  is input to the controller  180 , and then a detection signal corresponding to the dragging operation performed on the touch screen  151  is applied to the controller  180  within a predetermined period. The dragging operation performed on the touch screen  151  has directivity from a side of the touch screen  151 , which corresponds to the camera  121 , to the center of the touch screen  151 . 
     Accordingly, the controller  180  can determine that the aforementioned touch input operation corresponds to a control command with respect to the camera  121 . For example, if the aforementioned touch input operation corresponds to an ON command that starts the function of the camera  121 , the controller  180  controls the camera  121  to activate the function of the camera  121  according to combination of the detection signals obtained from the touch input operation. 
     Referring to  FIG. 12 , when the audio output module  152  is touched and the touch is dragged to the touch screen  151 , the controller  180  receives a detection signal corresponding to touch input applied to the audio output module  152 . 
     Furthermore, the controller  180  receives another detection signal through the touch screen  151  within a predetermined period from when the detection signal corresponding to the touch input applied to the audio output module  152  is input to the controller  180 . The second detection signal has directivity from a side of the touch screen  151 , which faces the audio output module  152 , to the center of the touch screen  151 . 
     The controller  180  executes a predetermined control command according to combination of the two detection signals. When the two detection signals are generated and applied to the controller  180  while the mobile terminal executes a specific function, the controller  180  can execute a control command related to the specific function. 
     For example, when the aforementioned touch input operation is performed and the two detection signals are successively input to the controller  180  while the voice call function of the mobile terminal is performed, the controller  180  can control the audio output module  152  to execute a speaker phone function. 
     Referring to  FIG. 13 , the microphone  122  is touched and then the touch is dragged to the touch screen  151  while the voice call function is performed. The controller  180  controls output of the microphone  122  with respect to the voice call function according to combination of detection signals corresponding to the touching and dragging operations. For example, the controller  180  can control the output level of the microphone  122  to become ‘0’ while the voice call function is executed to prevent the user&#39;s voice from being input and delivered to a counterpart. 
     Referring to  FIG. 14 , the touch screen  151  is touched and the touch is dragged to the audio output module  152  or the neighborhood of the audio output module  152  while the voice call function is performed. When detection signals corresponding to the touching and dragging operations are applied to the controller  180 , the controller  180  executes a predetermined function, that is, a control command with respect to the voice call function, which corresponds to combination of the detection signals because a control command with respect to the audio output module  152  is input and the mobile terminal currently receives a voice call. 
     If the predetermined function corresponds to a control command that instructs the contents of the voice call to be recorded, the controller  180  controls the audio output module  152  to record a voice signal output from the audio output module  152 . 
       FIG. 15  illustrates the example of the second embodiment of the present invention, which is described with reference to  FIG. 11 , in more detail. 
     Referring to  FIG. 15 , the user touches the camera  121  among the input/output units of the mobile terminal or the neighborhood of the camera  121  and drags the touch to the inside of the touch screen  151 . 
     The controller  180  activates the function of the camera  121  according to sequentially generated two inputs, that is, the touch input applied to the camera  121  and the drag to the touch screen  151 . When the camera  121  is activated, an image of an object is displayed on the touch screen  151 , as illustrated in the center image  13  of  FIG. 15 . 
     When a desirable image of the object is displayed, the user can capture the image in a manner of touching the touch screen  151 , as illustrated in the right image C of  FIG. 15 . 
       FIG. 16  illustrates the example of the second embodiment of the present invention, which is described with reference to  FIG. 12 , in more detail. 
     Referring to  FIG. 16 , the user touches the audio output module  152  among the input/output units of the mobile terminal or the neighborhood of the audio output module  152  and drags the touch to the inside of the touch screen  151 . 
     In this case, the controller  180  controls output of the audio output module  152  according to the sequentially generated two inputs, that is, the touch input applied to the audio output module  152  and the drag to the touch screen  151 . 
     If the mobile terminal performs a call function before the user performs the aforementioned input operation, for example, the controller  180  can control the audio output module  152  according to the input operation to change the currently performed call function to a speaker phone mode. 
     In this case, while the controller  180  can control the audio output module  152  to change the operating state of the mobile terminal to the speaker phone mode only using the touch input without having an additional operation of confirming the user, the operation of confirming the user can be formed as illustrated in  FIG. 16 . 
     That is, the controller  180  can display an icon for receiving a user&#39;s selection, for example, “yes” and “no”, on the touch screen  151  and control the audio output module  152  to inquire the user whether the speaker phone mode is activated, as illustrated in the center image B of  FIG. 16 . 
     The controller  180  can activate the speaker phone mode when the user selects “yes”, as illustrated in the right image C of  FIG. 16 . 
       FIG. 17  illustrates the example of the second embodiment of the present invention, which is described with reference to  FIG. 13 , in more detail. 
     Referring to  FIG. 17 , the user touches the microphone  122  or the neighborhood of the microphone  122  and drags the touch to the inside of the touch screen  151  while the voice call function is executed. 
     In this case, the controller  180  controls output of the microphone  152  according to the sequentially generated two inputs, that is, the touch input applied to the microphone  122  and the drag to the touch screen  151 . 
     That is, the controller  180  controls the output level of the microphone  122  to become ‘0’ so as to prevent the user&#39;s voice from being input to the mobile terminal while the voice call function is executed. 
     In this case, while it is possible to control the microphone  122  only using the touch input without having the additional operation of confirming the user to change the operating state of the mobile terminal to a mute mode, the operation of confirming the user can be performed as illustrated in  FIG. 17 . That is, the icon for receiving a user&#39;s selection, for example, “yes” and “no”, is displayed as illustrated in the center image B of  FIG. 17 , and the output level of the microphone  122  is controlled to become ‘0’ when the user select “yes” to activate the mute mode. 
       FIG. 18  illustrates an example according to the second embodiment of the present invention. 
     Referring to  FIG. 18 , the user touches the camera  121  among the input/output units of the mobile terminal or the neighborhood of the camera  121  and drags the touch to the inside of the touch screen  151 . 
     The controller  180  activates the function of the camera  121  according to the sequentially generated two inputs, that is, the touch input applied to the camera  121  and the drag to the touch screen  151 , and the current operating state of the mobile terminal. 
     If the mobile terminal executes the voice call function before the user performs the aforementioned input operation, the controller  180  can control the camera  121  according to the aforementioned input operation to change the current operating state of the mobile terminal to a video phone mode. 
     In this case, while the controller  180  can control the camera  121  only using the touch input without having the additional operation of confirming the user to change the operating state of the mobile terminal to the speaker phone mode, the controller  180  can perform the operation of confirming the user as illustrated in  FIG. 18 . 
     That is, the icon for receiving a user&#39;s selection item is displayed on the touch screen  151 , as illustrated in the center image B of  FIG. 18 , and the video phone function is activated according to a selective touch input of the user. 
       FIG. 19  illustrates the example of the second embodiment of the present invention, which is described with reference to  FIG. 14 , in more detail. 
     Referring to  FIG. 19 , the user touches a specific point of the touch screen  151  and drags the touch to the audio output module  152  or the neighborhood of the audio output module  152  while the voice call function is executed. 
     In this case, the controller  180  controls the audio output module  152  and/or a predetermined component of the mobile terminal to perform a predetermined function according to the current operating state of the mobile terminal in addition to the two inputs, that is, the touch input applied to the touch screen  151  and the drag to the audio output module  152 . Here, the predetermined function can be set to a function performed by the audio output module  152 , for example, in advance. 
     For example, the controller  180  can execute a function of recording the contents of a current call according to the touch input in the operating state of the mobile terminal. Accordingly, the controller  180  can control the memory  160  to record the contents of the call. 
     Here, while the controller  180  can execute the recording function only using the touch input without performing the operation of confirming the user, the operation of confirming the user can be performed as illustrated in  FIG. 19 . 
     Third Embodiment 
     According to a third embodiment of the present invention, input/output of information to/from the mobile terminal can be controlled according to a proximity touch in addition to a contact touch on an input/output unit of the mobile terminal. To achieve this, a proximity sensor included in the sensing unit  140  is provided to the position of the input/output unit or the neighborhood of the input/output unit. 
     Referring to  FIG. 20 , when the user performs a proximity touch operation in such a manner that the user moves his or her finger in close proximity to the mobile terminal or approaches his or her finger to the proximity sensor such that the proximity sensor located at the position of the camera  121 ′ or the neighborhood of the camera  121  can sense the proximity touch, the sensing unit  140  senses the proximity touch, generates a detection signal corresponding to the proximity touch and applies the detection signal to the controller  180 . 
     Then, the controller  180  analyzes the detection signal, confirms that the detection signal correspond to a control command with respect to the camera  121 ′ and controls the camera  121 ′ to perform an operation of capturing a currently input image, for example. 
     According to the third embodiment of the present invention, the method of controlling the input/output unit, which corresponds to a proximity touch sensed by the proximity sensor, can be set in advance according to various operating states of the mobile terminal. 
     Furthermore, when a proximity touch applied to a specific input/output unit is sensed, it is possible to control a specific input/output unit and another input/output unit related to a specific function together or control the other input/output unit in order to change the current input/output operating state of the mobile terminal or perform the specific function. 
     Referring to  FIG. 21 , when the mobile terminal receives a call, the user approaches his/her face to the neighborhood of the audio output module  152  or the touch screen  151  of the mobile terminal, for example, to receive the call. Then, the sensing unit  140  senses the approach of the user&#39;s face to the mobile terminal through the proximity sensor and applies a detection signal corresponding to the approach of the user&#39;s face to the controller  180 . 
     Accordingly, the controller  180  controls the mobile communication module  112  of the radio communication unit  110  to connect the received call, controls the audio output module  152  to output the voice of a counterpart and controls the microphone  122  to input the user&#39; voice. 
     Meantime, it is possible to control the function of a specific input/output unit according to the first embodiment and then control the detailed operation of the input/output unit according to a proximity touch according to the second embodiment or a contact touch according to the first embodiment. 
     Referring to  FIG. 22 , the user can contact-touch or proximity-touch the camera  121 ′ or the neighborhood of the camera  121 ′ to turn on the camera  121 ′ and activate the function of the camera  121 ′, as illustrated in the left image A, and then contact-touch or proximity-touch the camera  121 ′ or the neighborhood of the camera  121 ′ again, as illustrated in the right image B or C, to capture an image. 
     Particularly, when an image is captured according to a proximity touch, image instability according to a touch of the camera  121 ′ or click of a key button can be reduced. 
     Fourth Embodiment 
     According to a fourth embodiment of the present invention, the operation of an input/output unit can be controlled and the input/output unit can be used as a display according to a touch input applied to the input/output unit or the neighborhood of the input/output unit to display the current operating state according to the control of the input/output unit. To achieve this, at least one independently controllable light-emitting device which emits lights in different colors can be provided to the input/output units of the mobile terminal or the neighborhoods of the input/output units. The light-emitting device includes conventional known light-emitting devices such as LED, OLED and the like. 
     The controller  180  can independently control the at least one light-emitting device to change the light-emitting area of each light-emitting device or the color of light emitted from each light-emitting device according to an operating state which results from the control of an input/output unit in connection with control of the input/output unit. 
     Referring to  FIG. 23 , a light-emitting device in a circular or rectangular form, for example, is provided in close proximity to an input/output unit, for example, the camera  121 . 
     When a user touches the touch screen  151  and drags the touch to the camera  121  while a video phone call is received, the controller  180  controls the camera  121  and components related to the camera  121 , for example, the microphone  122  and the memory  160 , to record audio and video contents of the video phone call. 
     Here, the controller  180  can indicate that the video phone call is being recorded through the touch screen  151  and, simultaneously, turn on the light-emitting device provided in close proximity to the camera  121  to emit red light so as to indicate that the camera  121  is operating. 
     Referring to  FIG. 24 , a color-variable light-emitting device or a plurality of light-emitting devices which respectively emit lights in different colors can be provided to the back of an input/output unit, for example, the audio output module  152 , that is, the inside of the mobile terminal. 
     The controller  180  can respectively control the plurality of light-emitting devices or the color-variable light-emitting device to vary the color of light emitted from the position of the audio output module  152  according to the volume of the audio output module  152 . 
     For example, the controller  180  can gradually increase the volume of the audio output module  152  when a touch input such as drag is applied to the neighborhood of the audio output module  152  and gradually change the color of light emitted from the light-emitting device attached to the audio output module  152  from yellow to orange and then red to indicate that the volume of the audio output module  152  gradually increases. 
     Referring to  FIG. 25 , a color-variable light-emitting device or a plurality of light-emitting devices which respectively emit lights in different colors can be attached to the back of the microphone  122 , which corresponds to the inside of the mobile terminal. 
     The controller  180  can gradually increase the volume of the microphone  122  when a touch input such as drag is applied to the neighborhood of the microphone  122  and gradually change the color of light emitted from the light-emitting device attached to the microphone  122  from yellow to orange and then red to indicate that the volume of microphone  122  gradually increases. 
     Referring to  FIG. 26 , a light-emitting device in a circular form, for example, can be attached to the neighborhood of the camera  121 . 
     While the user touches the touch screen  151  and drags the touch to the camera  121  while the video phone call is received in the example illustrated in  FIG. 23 , the user touches the camera  121  and drags the touch to the touch screen  151  while the mobile terminal is in a standby state in the example illustrated in  FIG. 26 . 
     Accordingly, the controller  180  can control the camera  121  to activate the function of the camera  121  so as to photograph a desired object in a manner of touching the screen of the mobile terminal, for example, when the desired object is captured. 
     Furthermore, when the function of the camera  121  is activated, the controller  180  can operate the light-emitting device attached to the neighborhood of the camera  121  to indicate that the camera  121  is activated and the mobile terminal is in a camera mode. 
     As described above with reference to  FIGS. 23 and 26 , it is possible to control an input/output unit differently for the same touch input or similar touch inputs according to an operating state or a currently activated function of the mobile terminal. 
     Referring to  FIG. 27 , a plurality of independently controllable light-emitting devices are attached to the neighborhood of the camera  121 ′ in a circular form. 
     For example, when the user touches the neighborhood of the camera  121 ′ (A), the controller  180  turns on the camera  121 ′ to activate the function of the camera  121 ′ according to the sensed touch input. Furthermore, the controller  180  turns on the light-emitting devices located around the camera  121 ′ to emit light in a specific color in order to indicate activation of the camera  121 ′. 
     Subsequently, when the user drag the touch from left to right while the function of the camera  121 ′ is activated, the controller  180  can vary a level of a zoom-in function of the camera  121 ′ to perform a zoom-in operation in gradually increased magnification. 
     That is, the controller  180  can gradually increase the zoom-in magnification of the camera  121 ′ from 25% to 50% and then 100% according to the dragging operation. 
     Furthermore, the controller  180  can gradually increase the ratio of turned on light-emitting devices to the light-emitting devices located around the camera  121 ′ from ¼ to ½, ¾ and then 4/4 in order to indicate that the zoom-in magnification of the camera  121 ′ is increased while increasing the zoom-in magnification of the camera  121 ′. 
     Referring to  FIG. 28 , a color-variable light-emitting device or a plurality of light-emitting devices emitting lights in different colors are provided in a circular form in close proximity to the camera  121 ′. 
     When the user touches the neighborhood of the camera  121 ′, for example, the controller  180  turns on the camera  121 ′ according to the sensed touch input to activate the function of the camera  121 ′ and turns on the light-emitting devices provided around the camera  121 ′ to emit light in a specific color in order to indicate activation of the function of the camera  121 ′. 
     Subsequently, when the user drags the touch from left to the right wile the function of the camera  121 ′ is activated, the controller  180  can change the level of the zoom-in function of the camera  121 ′ to perform the zoom-in function in gradually increased magnification. 
     In addition, the controller  180  can vary the color of light emitted from the light-emitting devices provided around the camera  121 ′ or turn on the light-emitting devices emitting lights in different colors to gradually change the color of lights emitted from the light-emitting devices from yellow to green, blue and then red in order to indicate that the zoom-in magnification of the camera  121 ′ is increased while increasing the zoom-in magnification of the camera  121 ′. 
     The above-described method of controlling input/output of a mobile terminal according to the present invention can be written as computer programs in a computer readable recording medium. 
     The method of controlling input/output of a mobile terminal including a touch screen according to the present invention can be executed through software. In this case, the elements of the present invention are code segments to perform the necessary tasks. The program or code segments can be stored in a processor readable medium or transmitted by a computer data signals embodied in a carrier wave over a transmission medium or communication link. 
     The computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROM, DVD±ROM, DVD-RAM, magnetic tapes, floppy disks, hard disks, and optical data storage devices. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.