Patent Publication Number: US-2012038679-A1

Title: Mobile terminal, display device and controlling method thereof

Description:
This application also claims the benefit of the International Patent Application No. PCT/KR2010/005334 filed on Aug. 13, 2010, which is hereby incorporated by reference as if fully set forth herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a mobile terminal, and more particularly, to a mobile terminal, display device and controlling method thereof. Although the present invention is suitable for a wide scope of applications, it is particularly suitable for enabling data communications between a mobile terminal and a display device when the mobile terminal and the display device are connected together in further consideration of user&#39;s convenience. 
     2. Discussion of the Related Art 
     A mobile terminal is a device which may be configured to perform various functions. Examples of such functions include data and voice communications, capturing images and video via a camera, recording audio, playing music files and outputting music via a speaker system, and displaying images and video on a display. Some terminals include additional functionality which supports game playing, while other terminals are also configured as multimedia players. More recently, mobile terminals have been configured to receive broadcast and multicast signals which permit viewing of contents, such as videos and television programs. 
     Generally, terminals can be classified into mobile terminals and stationary terminals according to a presence or non-presence of mobility. And, the mobile terminals can be further classified into handheld terminals and vehicle mount terminals according to availability for hand-carry. 
     There are ongoing efforts to support and increase the functionality of mobile terminals. Such efforts include software and hardware improvements, as well as changes and improvements in the structural components which form the mobile terminal. 
     The mobile terminal is connected to such a display device as a notebook computer, a tablet computer, a personal computer, a television set and the like by wire or wireless and can then perform data communications in-between. When the data communications are performed between the mobile terminal and the display device, the demand for a method of displaying information on the data communications in-between on the mobile terminal and the display device is ongoing. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is directed to a mobile terminal, display device and controlling method thereof that substantially obviate one or more problems due to limitations and disadvantages of the related art. 
     An object of the present invention is to provide a mobile terminal, display device and controlling method thereof, by which when the data communications are performed between the mobile terminal and the display device, information on the data communications in-between can be displayed on the mobile terminal and the display device in further consideration of terminal user&#39;s convenience. 
     Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a mobile terminal according to the present invention includes a housing, a sensor unit configured to sense an orientation direction of the housing, a first display unit provided to one side of the housing, the first display unit configured to display a first screen image, an interface unit configured to be connected to an external display device having a second display unit, and a controller configured to: control a monitor window for displaying a second screen image corresponding to the first screen image to be generated from the second display unit by providing information on the first screen image to the external display device, and control the monitor window to be displayed within the second display unit according to the orientation direction of the housing by providing the sensed orientation direction of the housing to the external display device. 
     In another aspect of the present invention, a display device includes an interface unit configured to connect an external mobile terminal having a first display unit displaying a first screen image thereon, a second display unit, and a controller configured to: control a monitor window displaying a second screen image corresponding to the first screen image to be generated from the second display unit by receiving information on the first screen image from the external mobile terminal, receive an orientation direction of a housing of the mobile terminal, and control the monitor window to be displayed on the second display unit in the received orientation direction. 
     In another aspect of the present invention, a method of controlling a mobile terminal includes displaying a first screen image on a first display unit provided to one side of a housing of the mobile terminal, connecting the mobile terminal to an external display device having a second display unit, providing information on the first screen image to the external display device, controlling a monitor window displaying a second screen image corresponding to the first screen image to be generated from the second display unit, sensing an orientation direction of the housing and providing the sensed orientation direction of the housing to the external display device to control the monitor window to be displayed along the sensed orientation direction. 
     In another aspect of the present invention, a method of controlling a display device includes connecting an external mobile terminal having a first display unit displaying a first screen image thereon to the display device having a second display unit, controlling a monitor window displaying a second screen image corresponding to the first screen image to be generated from the second display unit by receiving information on the first screen image from the external mobile terminal, receiving an orientation direction of a housing of the external mobile terminal, and controlling the monitor window to be displayed on the second display unit in the received orientation direction. 
     In another aspect of the present invention, a mobile terminal includes a first display unit configured to display a first screen image thereon, an interface unit configured to be connected to an external display device having a second display unit, and a controller configured to control a monitor window for displaying a second screen image corresponding to the first screen image to be generated on the second display unit by providing information on the first screen image to the external display device, and control the monitor window to be enlarged on the second display unit when the first screen image is zoomed in on the first display unit. 
     In another aspect of the present invention, a display device includes an interface unit configured to be connected to an external mobile terminal having a first display unit displaying a first screen image thereon, a second display unit, and a controller configured to control a monitor window displaying a second screen image corresponding to the first screen image to be generated on the second display unit by receiving information on the first screen image from the external mobile terminal, and control the monitor window to be enlarged on the second display unit when the first screen image is zoomed in on the first display unit. 
     In another aspect of the present invention, a method of controlling a mobile terminal includes displaying a first screen image on a first display unit provided to one side of a housing of the mobile terminal, connecting the mobile terminal to an external display device having a second display unit, providing information on the first screen image to the external display device, controlling a monitor window for displaying a second screen image corresponding to the first screen image to be generated on the second display unit, and controlling the monitor window to be enlarged on the second display unit when the first screen image is zoomed in on the first display unit. 
     In another aspect of the present invention, a method of controlling a display device includes connecting an external mobile terminal having a first display unit displaying a first screen image thereon to the display device having a second display unit, controlling a monitor window displaying a second screen image corresponding to the first screen image to be generated on the second display unit by receiving information on the first screen image from the external mobile terminal, and controlling the monitor window to be enlarged on the second display unit when the first screen image is zoomed in on the first display unit. 
     In another aspect of the present invention, a display device includes a first display unit configured to display a first display unit configured to display a first screen image thereon, an interface unit configured to be connected to an external display device having a second display unit, and a controller configured to: control a monitor window for displaying a second screen image corresponding to the first screen image to be generated on the second display unit by providing information on the first screen image to the external display device, and control the second screen image to be zoomed out when the monitor window is enlarged on the second display unit. 
     In another aspect of the present invention, a display device includes an interface unit configured to connect an external mobile terminal having a first display unit displaying a first screen image thereon, a second display unit, and a controller configured to: control a monitor window displaying a second screen image corresponding to the first screen image to be generated on the second display unit by receiving information on the first screen image from the external mobile terminal, and control the second screen image to be zoomed out when the monitor window is enlarged on the second display unit. 
     In another aspect of the present invention, a method of controlling a mobile terminal includes displaying a first screen image on a first display unit provided to one side of a housing of the mobile terminal, connecting the mobile terminal to an external display device having a second display unit, providing information on the first screen image to the external display device, controlling a monitor window for displaying a second screen image corresponding to the first screen image to be generated on the second display unit, and controlling the second screen image to be zoomed out when the monitor window is enlarged on the second display unit. 
     In a further aspect of the present invention, a method of controlling a display device includes connecting the display device having a second display unit to an external mobile terminal having a first display unit displaying a first screen image thereon, controlling a monitor window displaying a second screen image corresponding to the first screen image to be generated on the second display unit by receiving information on the first screen image from the external mobile terminal, and controlling the second screen image to be zoomed out when the monitor window is enlarged on the second display unit. 
     Accordingly, the present invention provides the following effects and/or advantages. 
     First of all, according to at least one of the embodiments of the present invention, as the mobile terminal and the display device are connected to each other, when a monitor window related to a display of the mobile terminal is displayed on the display device, a terminal user is facilitated to switch an orientation direction of the monitor by switching an orientation direction of a housing of the mobile terminal if necessary. 
     Secondly, according to at least one of the embodiments of the present invention, when the monitor window related to the display of the mobile terminal is displayed on the display device, the monitor window is displayed by not blocking a previous object displayed on the display device. Therefore, the present invention can prevent the inconvenience that may be caused to a terminal user as the monitor window blocks the previous object. 
     Thirdly, according to at least one of the embodiments of the present invention, a zoom-in or zoom-out of the display of the mobile terminal, a zoom-in (or enlargement) or zoom-out (or reduction) of the display within the monitor window, and an enlargement and reduction of the monitor window itself are performed as being organically associated with each other, whereby a terminal user is further facilitated to view the display of the mobile terminal and the display of the display device. 
     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       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. The above and other aspects, features, and advantages of the present invention will become more apparent upon consideration of the following description of preferred embodiments, taken in conjunction with the accompanying drawing figures. In the drawings: 
         FIG. 1  is a block diagram of a mobile terminal according to one embodiment of the present invention; 
         FIG. 2  is a block diagram of a display device according to one embodiment of the present invention; 
         FIG. 3  is a diagram of a mobile terminal and a display device connected to each other to implement an embodiment of the present invention; 
         FIG. 4  is a flowchart according to an embodiment of the present invention; 
         FIG. 5  is a diagram of screens of a display unit of a display device according to an embodiment of the present invention; 
         FIGS. 6 and 7  are diagrams of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 8  is a diagram of a screen of a display unit of a display device according to an embodiment of the present invention; 
         FIGS. 9 and 10  are diagrams of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 11  is a flowchart according to an embodiment of the present invention; 
         FIG. 12  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 13  is a flowchart according to an embodiment of the present invention; 
         FIG. 14  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 15  is a flowchart according to an embodiment of the present invention; 
         FIG. 16  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 17  is a flowchart according to an embodiment of the present invention; 
         FIG. 18  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 19  is a flowchart according to an embodiment of the present invention; 
         FIG. 20  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 21  is a flowchart according to an embodiment of the present invention; 
         FIG. 22  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 23  is a flowchart according to an embodiment of the present invention; 
         FIG. 24  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 25  is a flowchart according to an embodiment of the present invention; 
         FIG. 26  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 27  is a flowchart according to an embodiment of the present invention; 
         FIG. 28  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 29  is a flowchart according to an embodiment of the present invention; 
         FIG. 30  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention; 
         FIG. 31  is a flowchart according to an embodiment of the present invention; and 
         FIG. 32  is a diagram of a front side of a mobile terminal and a display unit of a display device according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the following detailed description, reference is made to the accompanying drawing figures which form a part hereof, and which show by way of illustration specific embodiments of the invention. It is to be understood by those of ordinary skill in this technological field that other embodiments may be utilized, and structural, electrical, as well as procedural changes may be made without departing from the scope of the present invention. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or similar parts. 
     As used herein, the suffixes ‘module’, ‘unit’ and ‘part’ are used for elements in order to facilitate the disclosure only. Therefore, significant meanings or roles are not given to the suffixes themselves and it is understood that the ‘module’, ‘unit’ and ‘part’ can be used together or interchangeably. 
     First of all, a mobile terminal according to the present invention is described as follows. 
     The present invention can be applicable to a various types of terminals. Examples of such terminals include mobile terminals, such as mobile phones, smart phones, notebook computers (laptop computers), digital broadcast terminals, personal digital assistants, portable multimedia players (PMP) and navigators. 
       FIG. 1  is a block diagram of a mobile terminal  100  in accordance with an embodiment of the present invention.  FIG. 1  shows the mobile terminal  100  according to one embodiment of the present invention includes a wireless communication unit  110 , an A/V (audio/video) input unit  120 , a user input unit  130 , a sensing unit  140 , an output unit  150 , a memory  160 , an interface unit  170 , a controller  180 , a power supply unit  190  and the like.  FIG. 1  shows the mobile terminal  100  having various components, but it is understood that implementing all of the illustrated components is not a requirement. Greater or fewer components may alternatively be implemented. 
     In the following description, the above elements of the mobile terminal  100  are explained in sequence. 
     First of all, the wireless communication unit  110  typically includes one or more components which permits wireless communication between the mobile terminal  100  and a wireless communication system or network within which the mobile terminal  100  is located. For instance, the wireless communication unit  110  can include a broadcast receiving module  111 , a mobile communication module  112 , a wireless internet module  113 , a short-range communication module  114 , a position-location module  115  and the like. 
     The broadcast receiving module  111  receives a broadcast signal and/or broadcast associated information from an external broadcast managing server via a broadcast channel. 
     The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast managing server generally refers to a server which generates and transmits a broadcast signal and/or broadcast associated information or a server which is provided with a previously generated broadcast signal and/or broadcast associated information and then transmits the provided signal or information to a terminal. The broadcast signal may be implemented as a TV broadcast signal, a radio broadcast signal, and a data broadcast signal, among others. If desired, the broadcast signal may further include a broadcast signal combined with a TV or radio broadcast signal. 
     The broadcast associated information includes information associated with a broadcast channel, a broadcast program, a broadcast service provider, etc. And, the broadcast associated information can be provided via a mobile communication network. In this instance, the broadcast associated information can be received by the mobile communication module  112 . 
     The mobile communication module  112  transmits/receives wireless signals to/from one or more network entities (e.g., base station, external terminal, server, etc.) via a mobile network such as GSM (Global System for Mobile communications), CDMA (Code Division Multiple Access), WCDMA (Wideband CDMA) and so on. Such wireless signals may represent audio, video, and data according to text/multimedia message transceivings, among others. 
     The wireless internet module  113  supports Internet access for the mobile terminal  100 . This module may be internally or externally coupled to the mobile terminal  100 . In this instance, the wireless Internet technology can include WLAN(Wireless LAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), GSM, CDMA, WCDMA, LTE (Long Term Evolution) etc. 
     Wireless internet access by Wibro, HSPDA, GSM, CDMA, WCDMA, LTE or the like is achieved via a mobile communication network. In this aspect, the wireless internet module  113  configured to perform the wireless internet access via the mobile communication network can be understood as a sort of the mobile communication module  112 . 
     The short-range communication module  114  facilitates relatively short-range communications. Suitable technologies for implementing this module include radio frequency identification (RFID), infrared data association (IrDA), ultra-wideband (UWB), as well at the networking technologies commonly referred to as Bluetooth and ZigBee, to name a few. 
     The position-location module  115  identifies or otherwise obtains the location of the mobile terminal  100 . If desired, this module may be implemented with a global positioning system (GPS) module. 
     According to the current technology, the GPS module  115  can precisely calculate current 3-dimensional position information based on at least one of longitude, latitude and altitude and direction (or orientation) by calculating distance information and precise time information from at least three satellites and then applying triangulation to the calculated information. Currently, location and time information are calculated using three satellites, and errors of the calculated location position and time information are then amended using another satellite. Besides, the GPS module  115  can calculate speed information by continuously calculating a real-time current location. 
     Referring to  FIG. 1 , the audio/video (A/V) input unit  120  is configured to provide audio or video signal input to the mobile terminal  100 . As shown, the A/V input unit  120  includes a camera  121  and a microphone  122 . The camera  121  receives and processes image frames of still pictures or video, which are obtained by an image sensor in a video call mode or a photographing mode. And, the processed image frames can be displayed on the display  151 . 
     The image frames processed by the camera  121  can be stored in the memory  160  or can be externally transmitted via the wireless communication unit  110 . Optionally, at least two cameras  121  can be provided to the mobile terminal  100  according to environment of usage. 
     The microphone  122  receives an external audio signal while the portable device is in a particular mode, such as phone call mode, recording mode and voice recognition. This audio signal is processed and converted into electric audio data. The processed audio data is transformed into a format transmittable to a mobile communication base station via the mobile communication module  112  in case of a call mode. The microphone  122  typically includes assorted noise removing algorithms to remove noise generated in the course of receiving the external audio signal. 
     The user input unit  130  generates input data responsive to user manipulation of an associated input device or devices. Examples of such devices include a keypad, a dome switch, a touchpad (e.g., static pressure/capacitance), a jog wheel, a jog switch, etc. 
     The sensing unit  140  provides sensing signals for controlling operations of the mobile terminal  100  using status measurements of various aspects of the mobile terminal  100 . For instance, the sensing unit  140  may detect an open/close status of the mobile terminal  100 , relative positioning of components (e.g., a display and keypad) of the mobile terminal  100 , a change of position of the mobile terminal  100  or a component of the mobile terminal  100 , a presence or absence of user contact with the mobile terminal  100 , orientation or acceleration/deceleration of the mobile terminal  100 . For example, the sensing unit  140  includes at least one of a gyroscope sensor, acceleration sensor, a geomagnetic sensor and the like. As an example, consider the mobile terminal  100  being configured as a slide-type mobile terminal. In this configuration, the sensing unit  140  may sense whether a sliding portion of the mobile terminal  100  is open or closed. Other examples include the sensing unit  140  sensing the presence or absence of power provided by the power supply  190 , the presence or absence of a coupling or other connection between the interface unit  170  and an external device. And, the sensing unit  140  can include a proximity sensor  141 . 
     The output unit  150  generates outputs relevant to the senses of sight, hearing, touch and the like. And, the output unit  150  includes the display  151 , an audio output module  152 , an alarm unit  153 , a haptic module  154 , a projector module  155  and the like. 
     The display  151  is typically implemented to visually display (output) information associated with the mobile terminal  100 . For instance, if the mobile terminal  100  is operating in a phone call mode, the display will generally provide a user interface (UI) or graphical user interface (GUI) which includes information associated with placing, conducting, and terminating a phone call. As another example, if the mobile terminal  100  is in a video call mode or a photographing mode, the display  151  may additionally or alternatively display images which are associated with these modes, the UI or the GUI. 
     The display module  151  may be implemented using known display technologies including, for example, a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT-LCD), an organic light-emitting diode display (OLED), a flexible display and a three-dimensional display. The mobile terminal  100  may include one or more of such displays. 
     Some of the above displays can be implemented in a transparent or optical transmittive type, which can be named a transparent display. As a representative example for the transparent display, there is TOLED (transparent OLED) or the like. A rear configuration of the display  151  can be implemented in the optical transmittive type as well. In this configuration, a user can see an object in rear of a terminal body via the area occupied by the display  151  of the terminal body. 
     At least two displays  151  can be provided to the mobile terminal  100  in accordance with the implemented configuration of the mobile terminal  100 . For instance, a plurality of displays can be arranged on a single face of the mobile terminal  100  as being spaced apart from each other or being built in one body. Alternatively, a plurality of displays can be arranged on different faces of the mobile terminal  100 . 
     When the display  151  and a sensor for detecting a touch action (hereinafter called ‘touch sensor’) configures a mutual layer structure (hereinafter called ‘touchscreen’), the display  151  can be an input device as well as an output device. In this instance, the touch sensor can be configured as a touch film, a touch sheet, a touchpad or the like. 
     The touch sensor can be configured to convert a pressure applied to a specific portion of the display  151  or a variation of a capacitance generated from a specific portion of the display  151  to an electric input signal. Moreover, the touch sensor can be configured to detect a pressure of a touch as well as a touched position or size. 
     If a touch input is made to the touch sensor, signal(s) corresponding to the touch is transferred to a touch controller. The touch controller processes the signal(s) and then transfers the processed signal(s) to the controller  180 . Therefore, the controller  180  knows whether a prescribed portion of the display  151  is touched. 
     Referring to  FIG. 1 , the proximity sensor  141  can be provided to an internal area of the mobile terminal  100  enclosed by the touchscreen or around the touchscreen. The proximity sensor is the sensor that detects a presence or non-presence of an object approaching a prescribed detecting surface or an object existing around the proximity sensor using an electromagnetic field strength or infrared ray without mechanical contact. Hence, the proximity sensor  141  has durability longer than that of a contact type sensor and also has utility wider than that of the contact type sensor. 
     The proximity sensor  141  can include one of a transmittive photoelectric sensor, a direct reflective photoelectric sensor, a mirror reflective photoelectric sensor, a radio frequency oscillation proximity sensor, an electrostatic capacity proximity sensor, a magnetic proximity sensor, an infrared proximity sensor and the like. In case that the touchscreen includes the electrostatic capacity proximity sensor, it is configured to detect the proximity of a pointer using a variation of electric field according to the proximity of the pointer. In this instance, the touchscreen (touch sensor) can be classified as the proximity sensor. 
     The proximity sensor  141  detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch duration, a proximity touch position, a proximity touch shift state, etc.). And, information corresponding to the detected proximity touch action and the detected proximity touch pattern can be output to the touchscreen. 
     The audio output module  152  functions in various modes including a call-receiving mode, a call-placing mode, a recording mode, a voice recognition mode, a broadcast reception mode and the like to output audio data which is received from the wireless communication unit  110  or is stored in the memory  160 . During operation, the audio output module  152  outputs audio relating to a particular function (e.g., call received, message received, etc.). The audio output module  152  is often implemented using one or more speakers, buzzers, other audio producing devices, and combinations thereof. 
     The alarm unit  153  is output a signal for announcing the occurrence of a particular event associated with the mobile terminal  100 . Typical events include a call received event, a message received event and a touch input received event. The alarm unit  153  can output a signal for announcing the event occurrence by way of vibration as well as video or audio signal. The video or audio signal can be output via the display  151  or the audio output unit  152 . Hence, the display  151  or the audio output module  152  can be regarded as a part of the alarm unit  153 . 
     The haptic module  154  generates various tactile effects that can be sensed by a user. Vibration is a representative one of the tactile effects generated by the haptic module  154 . Strength and pattern of the vibration generated by the haptic module  154  are controllable. For instance, different vibrations can be output as being synthesized together or can be output in sequence. 
     The memory  160  is generally used to store various types of data to support the processing, control, and storage requirements of the mobile terminal  100 . Examples of such data include program instructions for applications operating on the mobile terminal  100 , contact data, phonebook data, messages, audio, still pictures (or photo), moving pictures, etc. And, a recent use history or a cumulative use frequency of each data (e.g., use frequency for each phonebook, each message or each multimedia) can be stored in the memory unit  160 . Moreover, data for various patterns of vibration and/or sound output in case of a touch input to the touchscreen can be stored in the memory  160 . 
     The memory  160  may be implemented using any type or combination of suitable volatile and non-volatile memory or storage devices including hard disk, random access memory (RAM), static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk, multimedia card micro type memory, card-type memory (e.g., SD memory, XD memory, etc.), or other similar memory or data storage device. And, the mobile terminal  100  can operate in association with a web storage for performing a storage function of the memory  160  on Internet. 
     The interface unit  170  is often implemented to couple the mobile terminal  100  with external devices. The interface unit  170  receives data from the external devices or is supplied with the power and then transfers the data or power to the respective elements of the mobile terminal  100  or enables data within the mobile terminal  100  to be transferred to the external devices. The interface unit  170  may be configured using a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for coupling to a device having an identity module, audio input/output ports, video input/output ports, an earphone port and/or the like. 
     Considering that the wireless internet module  113  and the short-range communication module  114  are usable as the wireless data ports, each of the wireless internet module  113  and the short-range communication module  114  can be understood as a sort of the interface unit  170 . 
     The identity module is the chip for storing various kinds of information for authenticating a use authority of the mobile terminal  100  and can include User Identify Module (UIM), Subscriber Identify Module (SIM), Universal Subscriber Identity Module (USIM) and/or the like. A device having the identity module (hereinafter called ‘identity device’) can be manufactured as a smart card. Therefore, the identity device is connectible to the mobile terminal  100  via the corresponding port. 
     When the mobile terminal  100  is connected to an external cradle, the interface unit  170  becomes a passage for supplying the mobile terminal  100  with a power from the cradle or a passage for delivering various command signals input from the cradle by a user to the mobile terminal  100 . Each of the various command signals input from the cradle or the power can operate as a signal enabling the mobile terminal  100  to recognize that it is correctly loaded in the cradle. 
     The controller  180  typically controls the overall operations of the mobile terminal  100 . For example, the controller  180  performs the control and processing associated with voice calls, data communications, video calls, etc. The controller  180  may include a multimedia module  181  that provides multimedia playback. The multimedia module  181  may be configured as part of the controller  180 , or implemented as a separate component. 
     Moreover, the controller  180  can perform a pattern (or image) recognizing process for recognizing a writing input and a picture drawing input carried out on the touchscreen as characters or images, respectively. 
     The power supply unit  190  provides power required by the various components for the mobile terminal  100 . The power may be internal power, external power, or combinations thereof. 
     Various embodiments described herein may be implemented in a computer-readable medium using, for example, computer software, hardware, or some combination thereof. For a hardware implementation, the embodiments described herein may be implemented within one or more 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, other electronic units designed to perform the functions described herein, or a selective combination thereof. Such embodiments may also be implemented by the controller  180 . 
     For a software implementation, the embodiments described herein may be implemented with separate software modules, such as procedures and functions, each of which perform one or more of the functions and operations described herein. The software codes can be implemented with a software application written in any suitable programming language and may be stored in memory such as the memory  160 , and executed by a controller or processor, such as the controller  180 . 
     In the above description, so far, the mobile terminal  100  according to an embodiment of the present invention is described. In the following description, a display device according to an embodiment of the present invention is explained. First of all, no limitation is put on a display device described in this disclosure as long as the display device can receive and display information on a display of the mobile terminal  100  by being connected to the mobile terminal  100  for communications in-between. For example, the display device can include, but is not limited to, one of a notebook computer (laptop), a tablet computer, a desktop computer, a television set (e.g., a digital TV set, a smart TV set, etc.) and the like. 
       FIG. 2  is a block diagram of a display device  200  according to one embodiment of the present invention. Referring to  FIG. 2 , the display device  200  according to one embodiment of the present invention includes a wireless communication unit  210 , an A/V (audio/video) input unit  220 , a user input unit  230 , an output unit  250 , a memory  260 , an interface unit  270 , a controller  280 , a power supply unit  290  and the like. 
     The wireless communication unit  210  can include a wireless internet module  213  and a short-range communication module  214 . The output unit  250  can include a display unit  251  and an audio output module  253 . 
     Because the components of the display device  200  are identical or mostly similar to the corresponding components of the above-described mobile terminal, their details are omitted from the following description for clarity of this disclosure. 
     Because the components shown in  FIG. 2  are not entirely mandatory, more or less components can be implemented for the display device  200 . For instance, when the display device  200  is a television, it can further include a broadcast receiving module. Moreover, when the display device  200  is the television, it may not be provided with the wireless internet module. Of course, the display device  200  can include the wireless internet module. Because the broadcast receiving module is identical or mostly similar to the former broadcast receiving module  111  of the mobile terminal  100  described with reference to  FIG. 1 , its details are omitted from the following description for clarity of this disclosure. 
     In the following description, how to connect the mobile terminal  100  and the display device  200  together is explained with reference to  FIG. 3 . 
       FIG. 3  is a diagram of a mobile terminal and a display device connected to each other to implement an embodiment of the present invention. Referring to  FIG. 3 , the mobile terminal  100  and the display device  200  can be connected to each other via the interface unit  170  of the mobile terminal  100  and the interface unit  270  of the display device  200 . The connection between the mobile terminal  100  and the display device  200  can be established by wire communication or wireless communication (e.g., short-range communication, wireless internet communication, etc.). 
       FIG. 3  shows a state in which the mobile terminal  100  and the display device  200  are connected to each other. For clarity and convenience of the following description, in order to respectively identify the components of the mobile terminal  100  and the display device  200 , ‘first’ is prefixed to a corresponding one of the components of the mobile terminal  100 , while ‘second’ is prefixed to a corresponding one of the components of the display device  200 . 
     For instance, the display unit  151  of the mobile terminal  100  is named a first display unit  151 , the controller  180  of the mobile terminal  100  is named a first controller  180 , the display unit  251  of the display device  200  is named a second display unit  251 , and the controller  280  of the display device  200  is named a second controller  280 . In addition, an image displayed on the first display unit  151  is named a first screen image  300 . 
     Once the connection between the mobile terminal  100  and the display device  200  is established, the mobile terminal  100  can provide information on a first screen image  300  displayed on the first display unit  151  to the display device  200 . In this instance, an application (e.g., a plug-in software, etc.) for processing the information on the first screen image  300  received from the mobile terminal  100  can be installed at the display device  200  in advance. 
     Hence, when the mobile terminal  100  and the display device  200  are connected to each other, the second controller  280  of the display device  200  can control a monitor window  400  for a first screen image  300  to be displayed on the second display unit  251 . The second controller  280  of the display device  200  then controls an image corresponding to the first screen image  300  to be displayed on the monitor window  400 . For clarity of the following description, in order to be discriminated from the first screen image  300  displayed in the mobile terminal  100 , the image displayed on the monitor window  400  is named a second screen image  500 . 
     In particular, the monitor window  400  can have a shape identical or similar to one face of a housing to which the first display unit  151  of the mobile terminal  100  is attached. Therefore, in case that prescribed key buttons  130  are provided to the face of the housing, soft key buttons  430  having the same shapes of the prescribed key buttons can be formed at the corresponding locations, respectively. 
     If the soft key button  430  is clicked by a mouse in the display device  200  (or the soft key button  430  is touched when the second display unit  251  includes a touchscreen), the second controller  280  of the display device  200  can send a control signal, which indicates that the soft key button  430  has been manipulated in the display device  200 , to the mobile terminal  100 . 
     If so, the first controller  180  of the mobile terminal  100  receives the control signal and can then control a specific function corresponding to the manipulation of the prescribed key button  130  matching the manipulated soft key button  430  to be executed in the mobile terminal  100 . And, the first controller  180  of the mobile terminal  100  can control an image according to the executed specific function to be displayed as the first screen image  300  on the first display unit  151 . Subsequently, the first controller  180  of the mobile terminal  100  can send information on the first screen image  300 , which includes the image according to the executed specific function, to the display device  200 . 
     If so, the second controller  280  of the display device  200  controls the second screen image  500  corresponding to the received first screen image  300  to be displayed on the monitor window  400 . Therefore, a user can indirectly manipulate the mobile terminal  100  by manipulating the monitor window  400  of the display device  200  instead of directly manipulating the mobile terminal  100 . And, the user can recognize the first screen image  300  of the mobile terminal  100  by viewing the second screen image  500  of the display device  200 . 
     It is not mandatory for the monitor window  400  to have a shape identical or similar to one face of the housing having the first display unit  151  of the mobile terminal  100  loaded thereon. For instance, other icons (e.g., a window close icon, a window minimize icon, a window maximize icon, etc.) (Not shown in the drawing) can be further shown in the monitor window  400  in addition to one face of the housing. Alternatively, the second screen image  500  can be displayed on the monitor window  400  without the shape of the housing face. 
     Further, the display device  200  receives information on the first screen image  300  from the mobile terminal  100  and then displays the received information as the second screen image  500  on the monitor window  400 . Therefore, the first screen image  300  and the second screen image  500  can share a content image generated from the mobile terminal  100  with each other. 
       FIG. 3  exemplarily shows that the content image generated from the mobile terminal  100  is a standby image, by which the present embodiment is non-limited. The content image generated from the mobile terminal  100  includes an image related to every function, menu or application executed in the mobile terminal  100 . 
     In the following description, how the mobile terminal  100  provides the information on the first screen image  300  to the display device  200  is explained in detail. 
     First of all, the first controller  180  of the mobile terminal  100  captures the first screen image  300  displayed on the first display unit  151  and transmits the captured first screen image  300  as the aforesaid information on the first screen  300  to the display device  200 . Afterwards, the second controller  280  of the display device  200  receives the captured first screen image  300  and then controls the received first screen image  300  to be displayed as the second screen image  500  on the monitor window  400 . 
     In doing so, the first screen image  300  and the second screen image  500  can depend on each other when zooming in or zooming out, for example. In particular, if the first screen image  300  zooms in or out, the second screen image  500  can zoom in or out correspondingly. Moreover, contents of the first and second screen images  300  and  500  can become dependent on each other. 
     Otherwise, the first controller  180  of the mobile terminal  100  can transmit a video signal input to the first display unit  151  to the display device  200  as the information on the first screen image  300 . The first display unit  151  of the mobile terminal  100  can then output the video signal as the first screen image  300 . Meanwhile, the second controller  280  of the display unit  200  receives the transmitted video signal and outputs the received video signal as the second screen image  500  to the monitor window  400  of the second display unit  251 . In particular, the first display unit  151  and the second display unit  251  can share the video signal output from the first controller  180  with each other. In the following description, the video signal is named a shared video signal. 
     In this instance, the first screen image  300  and the second screen image  500  can also depend on each other when zooming in or zooming out, for example. In particular, if the first screen image  300  zooms in or out, the second screen image  500  can zoom in or out correspondingly. Moreover, contents of the first and second screen images  300  and  500  can also become dependent on each other. 
     Further, the first controller  180  of the mobile terminal  100  generates a first video signal and a second video signal independent from the first video signal, both first and second video signals relating to a specific content image generated from the mobile terminal  100 . The first controller  180  can input the first video signal to the first display unit  151  and transmits the second video signal as the information on the first screen image  300  to the display device  200 . The first display unit  151  of the mobile terminal  100  then outputs the first video signal as the first screen image  300 . 
     Meanwhile, the second controller  280  of the display device  200  receives the transmitted second video signal and outputs the received second video signal as the second screen image  500  on the monitor window  400  of the second display unit  251 . It should be noted that each of the first and second video signals should be discriminated from the shared video signal in that the first video signal and the second video signal are independently provided to the first display unit  151  and the second display unit  251 , respectively. 
     In this instance, the first screen image  300  and the second screen image  500  can become independent from each other when zooming in and zooming out, for example. In particular, the second screen image  500  can zoom in or out irrespective of the zoom adjustment of the first screen image  300 . Moreover, the first screen image  300  and the second screen image  500  can become independent from each other in their contents. The zoom-in and zoom-out features of each of the first screen image  300  and the second screen image  500  are described again later. 
     In the above description, as the mobile terminal  100  and the display device  200  are connected to each other, the first screen image  300  displayed on the first display unit  151  and the monitor window  400  and the second screen image  500  displayed on the second display unit  251  are schematically explained. 
     In the following description, the first screen image  300 , the monitor window  400  and the second screen image  500  are explained in more detail with reference to  FIGS. 4 to 10 . In the following description, both of the first display unit  151  of the mobile terminal  100  and the second display unit  251  of the display device  200  can include touchscreens, respectively. Yet, the embodiment of the present invention is applied not only to the first and second display units  151  and  251  including the touchscreens, but also to the first and second display units  151  and  251  including normal displays. 
       FIG. 4  is a flowchart according to an embodiment of the present invention. Referring to  FIG. 4 , the first screen image  300  is displayed on the first display unit  151  of the mobile terminal  100  (S 41 ), and the mobile terminal  100  is connected to the display device  200  (S 42 ). Alternatively, the steps S 41  and S 42  can be performed in reverse order or at the same time. Details of the steps S 41  and S 42  are omitted from the following description for clarity, because the steps S 41  and S 42  were described with reference to  FIG. 3 . 
     As the mobile terminal  100  and the display device  200  are connected to each other, the monitor window  400  is generated on the second display unit  251  of the display device  200 . Further, the second screen image  500  corresponding to the first screen image  300  is displayed on the monitor window  400  (S 43 ). 
     How the monitor window  400  is generated on the second display unit  251  is explained in detail with reference to  FIG. 5  as follows. Referring to  FIG. 5 , at least one of objects A, B, C . . . can be displayed on the second display unit  251  of the display device  200  in advance. In this instance, ‘object’ means a graphic interface prepared for interaction with a user and can include at least one of a menu icon, a file icon, an execute icon, a thumbnail, a link, a text input box and the like. In  FIG. 5 , it is assumed that the object includes an icon or the like. 
     Referring to  FIG. 5  ( 5 - 1 ), when the mobile terminal  100  and the display device  200  are connected to each other, the second controller  280  of the display device  200  can control a generated position of the monitor window  400  to be determined by having no consideration of the objects previously displayed on the second display unit  251  of the display device  200 . In particular, the monitor window  400  can be generated to block the objects in order to be displayed at a specific position. 
     Referring to  FIG. 5  ( 5 - 2 ), when the mobile terminal  100  and the display device  200  are connected to each other, the second controller  280  of the display device  200  can control a generated position of the monitor window  400  to be determined in consideration of the objects previously displayed on the second display unit  251  of the display device  200 . In particular, the monitor window  400  can be generated at an appropriate position to avoid blocking the objects. 
     Moreover, referring to  FIG. 5  ( 5 - 3 ), the second controller  280  of the display device  200  can control a generated position and size of the monitor window  400  to be determined in consideration of the objects previously displayed on the second display unit  251 . In particular, the monitor window  400  can be generated with an appropriate size at an appropriate position to avoid blocking the objects. Of course, the position and size of the generated monitor window  400  can be adjusted by a user&#39;s manipulation. 
     The first screen image  300  and the second screen image  500  are described in detail with reference to  FIG. 6  as follows. Referring to  FIG. 6  ( 6 - 1 ), at least one of objects  301 ,  303 ,  305  and  307  for the content image can be displayed on the first screen image  300 . For clarity of the following description, the object in the first screen image  300  is named a first object. 
     Further, objects  501 ,  503 ,  505  and  507  respectively corresponding to the first objects  301 ,  303 ,  305  and  307  can be displayed on the second screen image  500 . For clarity of the following description, the object in the second screen image  500  is named a second object. 
     The first specific object  303  for execution of a message menu can be selected from the first screen image  300  of the mobile terminal  100 , for example. When the first display unit  151  of the mobile terminal  100  includes a touchscreen, the first specific object  303  can be selected by being touched. If so, the first controller  180  of the mobile terminal  100  controls the message menu to be executed based on the selection of the first specific object  303 . 
     Alternatively, when the specific second object  503  corresponding to the first specific object  303  is selected from the second screen image  500  of the display device  200 , the second controller  280  of the display device  200  transmits a control signal to the mobile terminal  100  to indicate that the specific second object  503  has been selected. In this instance, the selection of the specific second object  503  can be performed by clicking a mouse. Alternatively, if the second display unit  251  includes a touchscreen, the selection of the specific second object  503  can be performed by touching the specific second object  503 . The second controller  280  of the display device  200  can then transmit a control signal to the mobile terminal to indicate a mouse-click position or touch position on the monitor. If so, the first controller  180  of the mobile terminal  100  controls the message menu to be executed based on the control signal. 
     Once the message menu is executed in the mobile terminal  100 , referring to  FIG. 6  ( 6 - 2 ), the first controller  180  of the mobile terminal  100  controls a content image according to the executed message menu to be displayed as the first screen image  300  on the first display unit  151 , and controls the content image according to the executed message menu to be displayed as the second screen image  500  on the monitor window  400  of the second display unit  251 . 
     In the following description, an orientation direction of the monitor window  400  within the second display unit  251  according to an orientation direction of a housing of the mobile terminal  100  and display directions of first and second screen images  300  and  500  according to the orientation direction are described in detail with reference to  FIGS. 7 and 8 . 
     As mentioned in the foregoing description with reference to  FIG. 6 , the following situation is assumed. First of all, the housing of the mobile terminal  100  is positioned in a vertical direction. Secondly, the monitor window  400  is positioned in the vertical direction on the second display unit  251 . Thirdly, a display direction of the first screen image  300  of the first display unit  151  is a portrait direction. Fourthly, a display direction of the second screen image  500  of the second display unit  251  is the portrait direction. 
     Referring to  FIG. 7  ( 7 - 1 ), an orientation direction of the housing of the mobile terminal  100  can be changed when a user arranges the housing of the mobile terminal  100  in a horizontal direction by turning the housing of the mobile terminal  100  counterclockwise. If so, the first controller  180  of the mobile terminal  100  can detect the changed orientation direction via the first sensing unit  140 . The first controller  180  of the mobile terminal  100  can then provide the detected changed orientation direction to the display device  200  (S 44 ). 
     Subsequently, referring to  FIG. 7  ( 7 - 2 ), the second controller  280  of the display device  200  controls the monitor window  400  to be arranged in a horizontal direction by turning the monitor window  400  counterclockwise according to the changed orientation direction (S 45 ). 
     Meanwhile, referring to  FIG. 7  ( 7 - 3 ), the first controller  180  of the mobile terminal  100  controls the first screen image  300  in the first display unit  151  to be displayed in a landscape direction based on the changed orientation direction. The first controller  180  of the mobile terminal  100  can then provide the display device  200  with information on the first screen image  300  according to the landscape direction. 
     If so, referring to  FIG. 7  ( 7 - 4 ), the second controller  280  of the display device  200  controls the second screen image  500  in the monitor window  400  arranged in the horizontal direction to be displayed in the landscape direction. When the orientation direction of the monitor window  400  is changed in the second display unit  251 , a size of the monitor window  400  can be adjusted in consideration of objects existing as a neighbor to the monitor window  400 . This is further explained with reference to  FIG. 8  as follows. 
     Referring to  FIG. 8  ( 8 - 1 ), the monitor window  400  is oriented in the vertical direction on the second display  251  of the display device  200 . In this instance, the monitor window  400  is displayed in a first size in consideration of the objects A, B, C . . . arranged around the monitor window  400 . In particular, the first size can include a maximum size enough not to block the objects neighbor to the monitor window  400  when the monitor window  40  is arranged in the vertical direction. 
     As mentioned in the foregoing description, as the orientation direction of the housing of the mobile terminal  100  is changed, the orientation direction of the monitor window  400  can be changed into the horizontal direction. In doing so, referring to  FIG. 8  ( 8 - 2 ), unless the monitor window  400  blocks the neighbor objects, the second controller  280  of the display device  200  can control the size of the monitor window  400  changed in the horizontal direction to be maintained intact in the first size. 
     Alternatively, referring to  FIG. 8  ( 8 - 3 ), when the monitor window  400  is arranged in the horizontal direction, the second controller  280  of the display device  200  can enlarge the monitor window  400  into a second size, which is a maximum size large enough not to block the neighbor objects, in consideration of the arrangement of the neighbor objects. 
     In the description with reference to  FIG. 7 , the orientation direction of the monitor window  400  is changed according to the orientation direction of the housing of the mobile terminal  100 . However, it is not mandatory for the orientation direction of the monitor window  400  in the display unit  251  to be determined by the orientation direction of the housing of the mobile terminal  100 . This is further described with reference to  FIG. 9  as follows. 
     As mentioned in the foregoing description with reference to  FIG. 7  ( 7 - 4 ), the following situation is assumed. First of all, the housing of the mobile terminal  100  is positioned in a horizontal direction. Secondly, the monitor window  400  is positioned in the horizontal direction on the second display unit  251 . Thirdly, a display direction of the first screen image  300  of the first display unit  151  is a landscape direction. Fourthly, a display direction of the second screen image  500  of the second display unit  251  is the landscape direction. 
     Referring to  FIG. 9  ( 9 - 1 ), when a prescribed user command is input to the display device  200 , the second controller  280  of the display device  200  can control the monitor window  400  to be oriented in the vertical direction by being turned clockwise.  FIG. 9  ( 9 - 1 ) shows that the second display  251  of the display device  200  includes a touchscreen. In particular, referring to  FIG. 9  ( 9 - 1 ), after two positions on the monitor window  400  have been simultaneously touched, if the touch is rotated clockwise, the monitor window  400  is turned clockwise as well. Further, no limitation is put on the prescribed user command input to the display device  200  for the rotation of the monitor window  400 . 
     Once the monitor window  400  is oriented in the vertical direction, the second controller  280  of the display device  200  transmits a control signal to the mobile terminal  100  to indicate that the monitor window  400  has been oriented in the vertical direction. If so, referring to  FIG. 9  ( 9 - 2 ), the first controller  180  of the mobile terminal  100  controls the display direction of the first screen image  300  to be changed into the portrait direction despite that the housing of the mobile terminal  100  keeps being oriented in the horizontal direction. 
     In addition, the first controller  180  of the mobile terminal  100  can control information on the first screen image  300  changed into the portrait direction to be transmitted to the display device  200 . Subsequently, the second controller  280  of the display device  200  receives the information on the first screen image  300 , and controls the second screen image  500  to be displayed in the portrait direction. 
     Referring to  FIG. 9  ( 9 - 3 ), a user can orient the housing of the mobile terminal  100  in the vertical direction again by turning the housing of the mobile terminal  100  clockwise. Yet, because the first screen image  300  of the mobile terminal  100  is already displayed in the portrait direction, the display direction of the first screen image  300  may not be changed. Moreover, because the first controller  180  of the mobile terminal  100  determines that the monitor window  400  has already been oriented in the vertical direction via the former control signal, a control signal may not be transmitted to the display device  200  to indicate that the housing of the mobile terminal  100  is oriented in the vertical direction again. Even if the latter control signal is transmitted to the display device  200  to indicate that the housing of the mobile terminal  100  is oriented in the vertical direction again, the second controller  280  of the display device  200  can ignore the corresponding control signal because the monitor window  400  is already oriented in the vertical direction. 
     If the first controller  180  of the mobile terminal  100  captures the first screen image  300  and then transmits the captured first screen image  300  as information on the first screen image  300  to the display device  200  or if the first controller  180  of the mobile terminal  100  transmits the share video signal input to the first display unit  151  to the display device  200 , referring to  FIG. 9 , a display direction of the first screen image  300  is equal to that of the second screen image  500 . 
     Yet, if the first controller  180  of the mobile terminal  100  generates a first video signal and a second video signal independent from the first video signal and then transmits the first video signal and the second signal to the first display unit  151  and the display device  200 , respectively, a display direction of the first screen image  300  can be independent from that of the second screen image  500 . This is described in detail with reference to  FIG. 10  as follows. 
     As mentioned in the foregoing description with reference to  FIG. 9  ( 9 - 1 ), when a prescribed user command is input to the display device  200 , the second controller  280  of the display device  200  can control the monitor window  400  to be oriented in the vertical direction by being turned clockwise. Once the monitor window  400  is oriented in the vertical direction, the second controller  280  of the display device  200  can transmit a control signal to the mobile terminal  100  to indicate that the monitor window  400  has been oriented in the vertical direction. 
     Subsequently, the first controller  180  of the mobile terminal  100  transmits a second video signal of a portrait direction corresponding to the monitor window  400  of the vertical direction to the display device  200 . If so, referring to  FIG. 10  ( 10 - 1 ), the second controller  280  of the display device  200  controls the second screen image  500  to be displayed in the portrait direction according to the second video signal. 
     And, the first controller  180  of the mobile terminal  100  can keep providing the first video signal in a landscape direction independent from the second video signal, which corresponds to the housing of the mobile terminal  100  oriented in the horizontal direction, to the first display unit  151 . Therefore, referring to  FIG. 10  ( 10 - 1 ), the first screen image  300  can keep being displayed on the first display unit  151  in the landscape direction. 
     Referring to  FIG. 10  ( 10 - 2 ), a user can orient the housing of the mobile terminal  100  in the vertical direction again. If so, the first controller  180  of the mobile terminal  100  can control the first video signal, which enables the first screen image  300  to be displayed in the portrait direction to correspond to the housing of the mobile terminal  100  oriented in the vertical direction, to be provided to the first display unit  151 . And, the first controller  180  of the mobile terminal  100  keeps transmitting the second video signal corresponding to the monitor window  400  of the vertical direction to the display device  200 , thereby controlling the second screen image  500  to keep being displayed in the portrait direction on the second display unit  251 . 
     In the above description, the display directions of the first and second screen images  300  and  500  and the orientation direction of the monitor window  400  due to the orientation direction of the housing of the mobile terminal  100  are explained. Zoom-in and zoom-out features of each of the first and second screen images  300  and  500  and enlargement and reduction of the monitor window  400  will now be explained with reference to  FIGS. 11 and 12 . 
     In particular,  FIG. 11  is a flowchart according to an embodiment of the present invention, and  FIG. 12  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. Referring to  FIG. 12  ( 12 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . 
     In doing so, a user command for zooming in the first screen image  300  on the mobile terminal  100  can be input (S 111 ). For instance, the user command for the zoom-in feature can be input by performing two touches on two positions on the first display unit (e.g., a touchscreen)  151  simultaneously and dragging the touches in a pinching-out direction. Alternatively, the user command for the zoom-in feature can be input via a user manipulation performed on the first user input unit  130 . 
     Subsequently, referring to  FIG. 12  ( 12 - 2 ), the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed in (S 112 ). The first controller  180  of the mobile terminal  100  then transmits a second video signal independent from a first video signal for the zoomed-in first screen image  300  to the display device  200 . In this instance, the second video signal can include information on the original first screen image  300  before the zoom-in. 
     If so, the second controller  280  of the display device  200  can control a size of the monitor window  400  to be maintained intact (S 113 ). The second controller  280  of the display device  200  can then control a zoom level of the second screen image  500  to be maintained intact by maintaining a size of the second screen image  500  as it is (S 114 ). Alternatively, referring to 
       FIG. 12  ( 12 - 3 ), while the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed in (S 112 ), the first controller  180  of the mobile terminal  100  can provide information on the zoomed-in first screen image  300  to the display device  200 . In this instance, the information on the zoomed-in first screen image  300  can include a captured image of the first screen image  300  or the share video signal input to the first display unit  151 . 
     If so, the second controller  280  of the display device  200  can control the size of the monitor window  400  to be maintained intact (S 113 ), and control the second screen image  500  to be zoomed in by maintaining the size of the second screen image  500  (S 115 ). Alternatively, referring to  FIG. 12  ( 12 - 4 ), the first controller  180  of the mobile terminal  100  can control the first screen image  300  to be zoomed in (S 112 ). And, the first controller  180  of the mobile terminal  100  can provide a control signal to the display device  200  to indicate that the first screen image  300  has been zoomed in. 
     The second controller  280  of the display device  200  can also increase the size of the monitor window  400  in proportion to a level of the zoom-in according to the control signal (S 116 ). Subsequently, the first controller  180  of the mobile terminal  100  can transmit a second video signal independent from the first video signal for the zoomed-in first screen image  300  to the display device  200 . In this instance, the second video signal can include the original first screen image  300  before the zoom-in. 
     If so, the second controller  280  of the display device  200  can control a zoom level of the second screen image  500  to be maintained intact while the second screen image  500  is enlarged and displayed on the enlarged monitor window (S 117 ). In particular, a rectangular part  510  represented as a dotted line within the second screen image  500  shown in  FIG. 12  ( 12 - 4 ) can correspond to the entire second screen image  500  shown in  FIG. 12  ( 12 - 3 ). Besides, it is not mandatory for the rectangular part  510  represented as the dotted line to be displayed in  FIG. 12  ( 12 - 4 ). 
     In this disclosure, the concept of ‘zoom-in’ of an image is discriminated from the concept of ‘enlargement’ of an image. In particular, if a range of a content of an image displayed within a boundary of the image is decreased irrespective of whether the boundary of the image is enlarged or reduced, the image is ‘zoomed in’. On the contrary, irrespective of a change of a zoom level of an image, if a boundary of the image is enlarged, the image is ‘enlarged’. 
     For instance, if the second screen image  500  shown in  FIG. 12  ( 12 - 1 ) is changed into the second screen image  500  shown in  FIG. 12  ( 12 - 3 ), the second screen image  500  is not ‘enlarged’ but ‘zoomed in’. In another instance, if the second screen image  500  shown in  FIG. 12  ( 12 - 1 ) is changed into the second screen image  500  shown in  FIG. 12  ( 12 - 4 ), the second screen image  500  is not ‘zoomed in’ but ‘enlarged’. 
     The following description is made with reference to  FIGS. 13 and 14 . In particular,  FIG. 13  is a flowchart according to an embodiment of the present invention, and  FIG. 14  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. 
     Referring to  FIG. 14  ( 14 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . 
     In doing so, a user command for zooming out the first screen image  300  on the mobile terminal  100  can be input (S 131 ). For instance, the user command for the zoom-out feature can be input by performing two touches on two positions on the first display unit (e.g., a touchscreen)  151  simultaneously and dragging the touches in a pinching-in direction. Alternatively, the user command for the zoom-out feature can be input via a user manipulation performed on the first user input unit  130 . 
     Subsequently, referring to  FIG. 14  ( 14 - 2 ), the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed out (S 132 ). The first controller  180  of the mobile terminal  100  then transmits a second video signal independent from a first video signal for the zoomed-out first screen image  300  to the display device  200 . In this instance, the second video signal can include information on the original first screen image  300  before the zoom-out. If so, the second controller  280  of the display device  200  controls a size of the monitor window  400  to be maintained intact (S 133 ). The second controller  280  of the display device  200  then controls a zoom level of the second screen image  500  to be maintained intact by maintaining a size of the second screen image  500  as it is (S 134 ). 
     Alternatively, referring to  FIG. 14  ( 14 - 3 ), while the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed out (S 132 ), the first controller  180  of the mobile terminal  100  can provide information on the zoomed-out first screen image  300  to the display device  200 . In this instance, the information on the zoomed-out first screen image  300  can include a captured image of the first screen image  300  or the share video signal input to the first display unit  151 . If so, the second controller  280  of the display device  200  can control the size of the monitor window  400  to be maintained intact (S 133 ), and control the second screen image  500  to be zoomed out by maintaining the size of the second screen image  500  (S 135 ). 
     Alternatively, referring to  FIG. 14  ( 14 - 4 ), the first controller  180  of the mobile terminal  100  can control the first screen image  300  to be zoomed out (S 132 ), and provide a control signal to the display device  200  to indicate that the first screen image  300  has been zoomed out. 
     The second controller  280  of the display device  200  can also then increase the size of the monitor window  400  in proportion to a level of the zoom-out according to the control signal (S 136 ). Subsequently, the first controller  180  of the mobile terminal  100  can provide information on the zoomed-out first image  300  to the display device  200 . In this instance, the information on the zoomed-out first screen image  300  can include a captured image of the first screen image  300  or the share video signal input to the first display unit  151 . 
     If so, the second controller  280  of the display device  200  can control the second screen image  500  to be zoomed out while the second screen image  500  is displayed as being enlarged on the monitor window  400  (S 137 ). In particular, the rectangular part  510  represented as a dotted line within the second screen image  500  shown in  FIG. 14  ( 14 - 4 ) corresponds to the entire second screen image  500  shown in  FIG. 14  ( 14 - 1 ). However, it is not mandatory for the rectangular part  510  represented as the dotted line to be displayed in  FIG. 14  ( 12 - 4 ). 
     Further, the concept of ‘zoom-out’ of an image is discriminated from the concept of ‘reduction’ of an image. In particular, if a range of a content of an image displayed within a boundary is increased irrespective of whether the boundary of the image is enlarged or reduced, the image is ‘zoomed out’. On the contrary, irrespective of a change of a zoom level of an image, if a boundary of the image is reduced, the image is ‘reduced’. 
     For instance, if the second screen image  500  shown in  FIG. 14  ( 14 - 1 ) is changed into the second screen image  500  shown in  FIG. 14  ( 14 - 3 ), the second screen image  500  is not ‘reduced’ but ‘zoomed out’. In another instance, if the second screen image  500  shown in  FIG. 14  ( 14 - 4 ) is changed into the second screen image  500  shown in  FIG. 14  ( 14 - 3 ), the second screen image  500  is not ‘zoomed out’ but ‘reduced’. In still another instance, if the second screen image  500  shown in  FIG. 14  ( 14 - 1 ) is changed into the second screen image  500  shown in  FIG. 14  ( 14 - 4 ), the second screen image is enlarged as well as zoomed out. 
     The above description explains inputting a user command for zooming in or out the first screen image  300  in the mobile terminal  100 . In the following description, zooming in (or enlarging) or zooming out (or reducing) the second screen image  500  in the display device  200  will be explained with reference to  FIGS. 15 and 16 . 
     In particular,  FIG. 15  is a flowchart according to an embodiment of the present invention, and  FIG. 16  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. Referring to  FIG. 16  ( 16 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . 
     In doing so, a user command for zooming in or enlarging the second screen image  500  in the display device  200  can be input (S 151 ). For instance, the user command for the zoom-in or enlargement can be input by performing two touches on two positions on the second screen image  500  of the monitor window  400  of the second display unit (e.g., a touchscreen)  251  simultaneously and dragging the touches in a pinching-out direction. Alternatively, the user command for the zoom-in or enlargement can be input via a user manipulation performed on the second user input unit  230  of the display device  200 . 
     According to whether the user command is a command for zooming in the second screen image  500  or a command for enlarging the second screen image  500 , the first screen image  300  can vary more differently. This is explained in detail as follows. First of all, the user command is assumed to be the zoom-in command. If so, the second controller  280  of the display device  200  can transmit a control signal to the mobile terminal  100  to indicate that the zoom-in command of the second screen image  500  has been input. If so, the first controller  180  of the mobile terminal  100  transmits a video signal corresponding to the control signal to the display device  200 . 
     Subsequently, referring to  FIG. 16  ( 16 - 2 ), the second controller  280  of the display device  200  controls the second screen image  500  to be zoomed in using the video signal (S 152 ), and controls a size of the monitor window  400  to be maintained intact (S 153 ). Referring again to  FIG. 16  ( 16 - 2 ), the first controller  180  of the mobile terminal  100  controls a zoom level of the first screen image  300  to be not changed in the first display unit  151  irrespective of the control signal (S 154 ). 
     Then, the second controller  280  of the display device  200  transmits a control signal to the mobile terminal  100  to indicate that the zoom-in command of the second screen image  500  has been input. If so, the first controller  180  of the mobile terminal  100  transmits a video signal corresponding to the control signal to the display device  200 . 
     Referring to  FIG. 16  ( 16 - 3 ), the second controller  280  of the display device  200  controls the second screen image  500  to be zoomed in using the video signal (S 152 ), and controls a size of the monitor window  400  to be maintained intact (S 153 ). Referring again to  FIG. 16  ( 16 - 3 ), the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed in to cope with the control signal (S 155 ). 
     Next, the user command is assumed to be the enlargement command. If so, it may be unnecessary for the second controller  280  of the display device  200  to transmit the control signal indicating that the enlargement command of the second screen image  500  has been input to the mobile terminal  100 . 
     Instead, referring to  FIG. 16  ( 16 - 4 ), the second controller  280  of the display device  200  controls the second screen image  500  to be enlarged without adjustment of the zoom level of the second screen image  500  (S 152 ). As the second screen image  500  is enlarged, the second controller  280  of the display device  200  controls the size of the monitor window  400  to be enlarged (S 156 ). 
     Moreover, referring again to  FIG. 16  ( 16 - 4 ), because the first controller  180  of the mobile terminal  100  does not receive any control signal from the display device  200 , the first screen image  300  on the first display unit  151  can be maintained as it is. Namely, the zoom level of the first screen image  300  is not adjusted (S 157 ). 
     Meanwhile, the rectangular part  510  represented as a dotted line within the second screen image  500  shown in  FIG. 16  ( 16 - 4 ) can correspond to the entire second screen image  500  shown in  FIG. 16  ( 16 - 3 ). However, it is not mandatory for the rectangular part  510  represented as the dotted line to be displayed in  FIG. 16  ( 16 - 4 ). 
     The following description is made with reference to  FIGS. 17 and 18 . In particular,  FIG. 17  is a flowchart according to an embodiment of the present invention, and  FIG. 18  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. 
     Referring to  FIG. 18  ( 18 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . 
     In doing so, a user command for zooming out or reducing the second screen image  500  in the display device  200  can be input (S 171 ). For instance, the user command for the zoom-out or reduction can be input by performing two touches on two positions on the second screen image  500  of the monitor window  400  of the second display unit (e.g., a touchscreen)  251  simultaneously and dragging the touches in a pinching-in direction. Alternatively, the user command for the zoom-out or reduction feature can be input via a user manipulation performed on the second user input unit  230  of the display device  200 . 
     According to whether the user command is a command for zooming out the second screen image  500  or a command for reducing the second screen image  500 , the first screen image  300  can vary more differently. This is explained in detail as follows. 
     First of all, the user command is assumed to be the zoom-out command. If so, the second controller  280  of the display device  200  transmits a control signal to the mobile terminal  100  to indicate that the zoom-out command of the second screen image  500  has been input. The first controller  180  of the mobile terminal  100  then transmits a video signal corresponding to the control signal to the display device  200 . 
     Subsequently, referring to  FIG. 18  ( 18 - 2 ), the second controller  280  of the display device  200  controls the second screen image  500  to be zoomed out using the video signal (S 172 ), and controls a size of the monitor window  400  to be maintained intact (S 173 ). Referring to  FIG. 18  ( 18 - 2 ), the first controller  180  of the mobile terminal  100  controls a zoom level of the first screen image  300  to be not changed in the first display unit  151  irrespective of the control signal (S 174 ). 
     The user command is still assumed to be the zoom-out command. If so, the second controller  280  of the display device  200  transmits a control signal to the mobile terminal  100  to indicate that the zoom-out command of the second screen image  500  has been input. The first controller  180  of the mobile terminal  100  then transmits a video signal corresponding to the control signal to the display device  200 . 
     If so, referring to  FIG. 18  ( 18 - 3 ), the second controller  280  of the display device  200  controls the second screen image  500  to be zoomed out using the video signal (S 172 ), and controls a size of the monitor window  400  to be maintained intact (S 173 ). Referring to  FIG. 18  ( 18 - 3 ), the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed out to cope with the control signal (S 175 ). 
     Next, the user command is assumed to be the reduction command. If so, it may be unnecessary for the second controller  280  of the display device  200  to transmit the control signal, which indicates that the reduction command of the second screen image  500  has been input, to the mobile terminal  100 . 
     Instead, referring to  FIG. 18  ( 18 - 4 ), the second controller  280  of the display device  200  can control the second screen image  500  to be reduced (S 172 ). As the second screen image  500  is reduced, the second controller  280  of the display device  200  can control the size of the monitor window  400  to be reduced as well (S 176 ). 
     Moreover, referring to  FIG. 18  ( 18 - 4 ), because the first controller  180  of the mobile terminal  100  does not receive any control signal from the display device  200 , the first screen image  300  on the first display unit  151  can be maintained as it is. Namely, the zoom level of the first screen image  300  is not adjusted (S 177 ). 
     Meanwhile, the rectangular part  510  represented as a dotted line within the second screen image  500  shown in  FIG. 18  ( 18 - 4 ) can correspond to the entire second screen image  500  shown in  FIG. 18  ( 18 - 3 ). However, it is not mandatory for the rectangular part  510  represented as the dotted line to be displayed in  FIG. 18  ( 18 - 3 ). 
     In the above description, the second screen image  500  is zoomed in/out or enlarged/reduced in the display device  200 . In the following description, the monitor window  400  being enlarged or reduced in the display device  200  is made with reference to  FIGS. 19 and 20 . 
     In particular,  FIG. 19  is a flowchart according to an embodiment of the present invention, and  FIG. 20  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. Referring to  FIG. 20  ( 20 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . 
     A user command for enlarging the monitor window  400  in the display device  200  is then input (S 191 ). For instance, the user command for the enlargement can be input by performing a touch on a corner part of the monitor window  400  and then dragging the touch in a radial direction away from a center of the monitor window  400 . Alternatively, the user command for the enlargement can be input via a user manipulation performed on the second user input unit  230  of the display device  200  as well. The monitor window  400  can also be enlarged to become an entire screen in the second screen image  500 . 
     Subsequently, referring to  FIG. 20  ( 20 - 2 ), the second controller  280  of the display device  200  controls the monitor window  400  to be enlarged (S 192 ). Further, the second controller  280  of the display device  200  controls the second screen image  500  to be enlarged in the enlarged monitor window  400  (S 193 ), and controls a zoom level of the second screen image  500  to be not changed (S 194 ). 
     In addition, it may not be necessary for the second controller  280  of the display device  200  to transmit a control signal, which indicates that the user command for the enlargement of the monitor window  400  has been input, to the mobile terminal  100 . 
     Therefore, referring to  FIG. 20  ( 20 - 2 ), because the first controller  180  of the mobile terminal  100  does not receive any control signal from the display device  200 , the first screen image  300  in the first display unit  151  can be maintained as it is. Namely, a zoom level of the first screen image  300  does not change (S 195 ). The description with reference to  FIG. 20  ( 20 - 2 ) may have the same principle of the former description with reference to  FIG. 16  ( 16 - 4 ). 
     Alternatively, when the second screen image  500  is enlarged in the enlarged monitor window  400 , the second controller  280  of the display device  200  can transmit a control signal, which indicates that the user command for the enlargement of the monitor window  400  has been input, to the mobile terminal  100 . If so, the first controller  180  of the mobile terminal  100  can transmit a video signal corresponding to the control signal to the display device  200 . 
     Referring to  FIG. 20  ( 20 - 3 ), the second controller  280  of the display device  200  can control the second screen image  500  to be zoomed out in the enlarged monitor window  400  using the video signal (S 196 ). Referring to  FIG. 20  ( 20 - 3 ), the first controller  180  of the mobile terminal  100  can control the zoom level of the first screen image  300  not to change in the first display unit  151  irrespective of the control signal (S 197 ). 
     Alternatively, referring to  FIG. 20  ( 20 - 4 ), when the second screen image  500  is zoomed out, the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be zoomed out in the first display unit  151  to cope with the control signal (S 198 ). 
     Meanwhile, the rectangular part  510  represented as a dotted line within the second screen image  500  shown in  FIG. 20  ( 20 - 3 ) or ( 20 - 4 ) can correspond to the entire second screen image  500  shown in  FIG. 20  ( 20 - 1 ). However, it is not mandatory for the rectangular part  510  represented as the dotted line to be displayed in  FIG. 20  ( 20 - 4 ). 
     The following description is made with reference to  FIGS. 21 and 22 . In particular,  FIG. 21  is a flowchart according to an embodiment of the present invention, and  FIG. 22  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. 
     Referring to  FIG. 22  ( 22 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . 
     A user command for reducing the monitor window  400  in the display device  200  is then input (S 211 ). For instance, the user command for the reduction can be input by performing a touch on a corner part of the monitor window  400  and then dragging the touch in a radial direction toward a center of the monitor window  400 . Alternatively, the user command for the reduction can be input via a user manipulation performed on the second user input unit  230  of the display device  200  as well. 
     Subsequently, referring to  FIG. 22  ( 22 - 2 ), the second controller  280  of the display device  200  controls the monitor window  400  to be reduced (S 212 ). In addition, the second controller  280  of the display device  200  controls the second screen image  500  to be reduced in the reduced monitor window  400  (S 213 ). However, the second controller  280  of the display device  200  can control a zoom level of the second screen image  500  not to be changed (S 214 ). 
     Further, it may not be necessary for the second controller  280  of the display device  200  to transmit a control signal, which indicates that the user command for the reduction of the monitor window  400  has been input, to the mobile terminal  100 . 
     Therefore, referring to  FIG. 22  ( 22 - 2 ), because the first controller  180  of the mobile terminal  100  does not receive any control signal from the display device  200 , the first controller  180  can maintain the first screen image  300  in the first display unit  151  as it is. Namely, a zoom level of the first screen image  300  does not change (S 215 ). 
     The description with reference to  FIG. 22  ( 22 - 2 ) may have the same principle of the former description with reference to  FIG. 18  ( 18 - 4 ). Alternatively, when the second screen image  500  is reduced in the reduced monitor window  400 , the second controller  280  of the display device  200  can transmit a control signal, which indicates that the user command for the reduction of the monitor window  400  has been input, to the mobile terminal  100 . If so, the first controller  180  of the mobile terminal  100  can transmit a video signal corresponding to the control signal to the display device  200 . 
     If so, referring to  FIG. 22  ( 22 - 3 ), the second controller  280  of the display device  200  controls the second screen image  500  to be zoomed in using the video signal (S 216 ). Referring to  FIG. 22  ( 22 - 3 ), the first controller  180  of the mobile terminal  100  can control the zoom level of the first screen image  300  not to change in the first display unit  151  irrespective of the control signal (S 217 ). 
     Alternatively, referring to  FIG. 22  ( 22 - 4 ), when the second screen image  500  is zoomed in, the first controller  180  of the mobile terminal  100  can control the first screen image  300  to be zoomed in on the first display unit  151  to cope with the control signal (S 218 ). Meanwhile, the rectangular part  510  represented as a dotted line within the second screen image  500  shown in  FIG. 22  ( 22 - 1 ) can correspond to the entire second screen image  500  shown in  FIG. 22  ( 22 - 4 ). However, it is not mandatory for the rectangular part  510  represented as the dotted line to be displayed in  FIG. 22  ( 22 - 1 ). 
     The following description is made with reference to  FIGS. 23 and 24 . In particular,  FIG. 23  is a flowchart according to an embodiment of the present invention, and  FIG. 24  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. 
     Referring to  FIG. 24  ( 24 - 1 ), the first screen image  300  is displayed on the first display  151  of the mobile terminal  100 , the monitor window  400  is displayed on the second display  251  of the display device  200 , and the second screen image  500  is displayed on the monitor window  400 . A specific one object (e.g., an object C) can be touched and selected from first objects displayed on the first screen image  300  in the mobile terminal  100  (S 231 ). 
     Subsequently, the first controller  180  of the mobile terminal  100  controls an image corresponding to the specific object to be displayed as the first screen image  300  on the first display unit  151  as being zoomed in at a specific zoom level (S 232 ). 
     Further, the first controller  180  of the mobile terminal  100  can provide a picture of the image as information on the first screen image  300  to the display device  200 . If so, referring to  FIG. 24  ( 24 - 2 ), the second controller  280  of the display device  200  controls the picture of the image to be displayed as the second screen image  500  on the second display unit  251  as being zoomed out at a level lower than the specific zoom level (S 233 ). In this instance, the picture of the image can be displayed as being fully zoomed out. The picture of the image can also be displayed as an entire screen on the second display unit  251 . 
     Moreover, the second controller  280  of the display device  200  controls a region  510  corresponding to the first screen image  300  to be displayed on the second display unit  251  as being visually discriminated. Afterwards, a touch can be performed on the first display unit  151  of the mobile terminal  100  and can be then dragged in a prescribed direction. 
     If so, referring to  FIG. 24  ( 24 - 3 ), the first controller  180  of the mobile terminal  100  controls the first screen image  300  to be scrolled in the prescribed direction. The second controller  280  of the display device  200  then controls the region  510  corresponding to the scrolled first screen image  300  to be displayed as being visually discriminated. 
     How the monitor window  400  is generated from the second display  251  of the display device  200  when the mobile terminal  100  and the display device  200  are connected to each other will now be explained with reference to  FIGS. 25 and 26 . In particular,  FIG. 25  is a flowchart according to an embodiment of the present invention, and  FIG. 26  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. 
     Referring to  FIGS. 25 and 26 , as mentioned in the foregoing description, the mobile terminal  100  and the display device  200  can be connected to each other (S 251 ). Referring to  FIG. 26  ( 26 - 1 ), at least one of the first controller  180  of the mobile terminal  100  and the second controller  280  of the display device  200  can control the monitor window  400  not to be directly generated from the second display unit  251  even if the mobile terminal  100  and the display device  200  are connected to each other. 
     For instance, referring to  FIG. 26  ( 26 - 1 ), the first controller  180  of the mobile terminal  100  can control information on the first screen image  300  not to be provided. Alternatively, the second controller  280  of the display device  200  can control the monitor window  400  not to be generated from the second display unit  251  irrespective of whether the information on the first screen image  300  is received from the mobile terminal  100 . 
     Subsequently, a prescribed user command for enabling the monitor window  400  to be generated from the second display unit  251  can be input to the mobile terminal  100  (S 252 ). For instance, the user command for generating the monitor window  400  can be input by performing a touch and drag on the first display unit (e.g., touchscreen)  151  along with a straight line trace in one direction or a trace of a specific pattern. Alternatively, the user command for generating the monitor window  400  can be input via a user manipulation performed on the first user input unit  130  of the mobile terminal  100 . 
     When the prescribed user command is input, referring to  FIG. 26  ( 26 - 2 ), at least one of the first controller  180  of the mobile terminal  100  and the second controller  280  of the display device  200  can control the monitor window  400  to be generated from the second display unit  251  of the display device  200  (S 253 ). 
     For instance, the first controller  180  of the mobile terminal  100  can provide the display device  200  with a control signal indicating that the prescribed user command has been input. The first controller  180  of the mobile terminal  100  can also provide the display device  200  with information on the first screen image  300 . 
     If so, referring to  FIG. 26  ( 26 - 2 ), the second controller  280  of the display device  200  can control the monitor window  400  to be generated from the second display unit  251  in response to the control signal. The second controller  280  of the display device  200  can also control the second screen image  500  to be displayed on the monitor window  400  using the information on the first screen image  300  provided by the mobile terminal  100 . 
     Meanwhile, referring to  FIG. 26  ( 26 - 3 ), when the monitor window  400  is generated from the display device  200 , the first controller  180  of the mobile terminal  100  controls the power consumption of the mobile terminal  100  to be saved by automatically turning off the first display unit  151  not to display the first screen image  300 . Optionally, when the mobile terminal  100  and the display device  200  are disconnected from each other, if the first display  151  of the mobile terminal  100  is automatically turned on, the first controller  180  of the mobile terminal  100  can control the first screen image  300  to be displayed again in the first display  151 . 
     How the monitor window  400  displayed on the second display unit  251  changes according to a distance between the mobile terminal  100  and the display device  200  or a communication signal strength after the mobile terminal  100  and the display device  200  have been connected to each other will now be explained with reference to  FIGS. 27 and 28 . 
     In particular,  FIG. 27  is a flowchart according to an embodiment of the present invention, and  FIG. 28  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. Referring to  FIGS. 27 and 28 , as mentioned in the foregoing description, the mobile terminal  100  and the display device  200  can be connected to each other (S 271 ). If so, as mentioned in the foregoing description, referring to  FIG. 28  ( 28 - 1 ), the monitor window  400  can be displayed on the second display  251  of the display device  200  (S 272 ). 
     A terminal user can then change a spaced distance between the mobile terminal  100  and the display device  200  by shifting at least one of the mobile terminal  100  and the display device  200 . When the mobile terminal  100  and the display device  200  are wirelessly connected to each other, the variation of the spaced distance in-between can bring a variation of a communication signal strength in-between. 
     If so, at least one of the first controller  180  of the mobile terminal  100  and the second controller  280  of the display device  200  can vary a size of the monitor window  400  according to the communication signal strength (S 273 ). In particular, the second controller  280  of the display device  200  controls the size of the monitor window  400  to vary according to the communication signal strength, and controls a second screen image  500  to be displayed on the monitor window  400  as being enlarged or reduced to fit the size of the monitor window  400 . 
     Moreover, the first controller  180  of the mobile terminal  100  can provide the display device  200  with information on a first screen image  300  corresponding to the monitor window  400  having the size varying according to the communication signal strength. 
     Referring to  FIG. 28  ( 28 - 2 ), if the communication signal strength becomes stronger as the spaced distance between the mobile terminal  100  and the display device  200  decreases, at least one of the first controller  180  of the mobile terminal  100  and the second controller  280  of the display device  200  can control the size of the monitor window  400  to increase according to the stronger communication signal strength. 
     Referring to  FIG. 28  ( 28 - 3 ), if the communication signal strength is weakened as the spaced distance between the mobile terminal  100  and the display device  200  increases, at least one of the first controller  180  of the mobile terminal  100  and the second controller  280  of the display device  200  can control the size of the monitor window  400  to decrease according to the weakened communication signal strength. Also, if the communication between the mobile terminal  100  and the display device  200  is disconnected as the spaced distance increases enough, the monitor window  400  can disappear from the second display unit  251 . 
     How the monitor window  400  displayed on the second display unit  251  varies when a user input is not performed on the mobile terminal  100  for a prescribed period of time will now be explained with reference to  FIGS. 29 and 30 . 
     In particular,  FIG. 29  is a flowchart according to an embodiment of the present invention, and  FIG. 30  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. 
     Referring to  FIGS. 29 and 30 , after the mobile terminal  100  and the display device  200  have been connected to each other, a user input may not be performed on the mobile terminal  100  for a prescribed period of time (S 291 ). No user input in the mobile terminal  100  means that the touchscreen or user input unit  130  of the mobile terminal  100  is not manipulated. 
     Afterwards, as the first display unit  151  is automatically turned off, the first controller  180  of the mobile terminal  100  can control the first screen image  300  not to be further displayed (S 292 ). Also, if a user input is performed on the mobile terminal  100 , the display unit  151  can be automatically turned on. 
     Subsequently, the first controller  180  of the mobile terminal  100  provides the display device  200  with a control signal, which indicates that the user input has not been performed on the mobile terminal  100  for the prescribed period of time, if necessary. If so, referring to  FIG. 30  ( 30 - 1 ), the second controller  280  of the display device  200  keeps displaying the monitor window  400  on the second display unit despite that the first display unit  151  of the mobile terminal  100  is turned off, and controls the second screen image  500  to keep being displayed on the monitor window  400  (S 293 ). 
     Alternatively, referring to  FIG. 30  ( 30 - 2 ), in response to the control signal indicating that the first display  151  of the mobile terminal  100  has been turned off, the second controller  280  of the display device  200  keeps displaying the monitor window  400  on the second display unit  251 , but controls the second screen image  500  to be not displayed on the monitor window  400  (S 294 ). In particular, the second screen image  500  can be blanked on the monitor window  400 . 
     If a control signal indicating that the first display unit  151  is turned on is received from the mobile terminal  100 , the second controller  280  of the display device  200  controls the second screen image  500  to be displayed again on the monitor window  400 . Alternatively, referring to  FIG. 30  ( 30 - 3 ), in response to the control signal indicating that the first display  151  of the mobile terminal  100  has been turned off, the second controller  280  of the display device  200  can control the monitor window  400  not to be displayed on the second display unit  251 . When the monitor window  400  is not displayed, the second screen image  500  is not displayed on the monitor window  400 . 
     If a control signal indicating that the first display unit  151  is turned on is received from the mobile terminal  100 , the second controller  280  of the display device  200  controls the monitor window  400  to be displayed again, and controls the second screen image  500  to be displayed again on the monitor window  400 . After the mobile terminal  100  and the display device  200  have been connected to each other and a prescribed event occurs in the mobile terminal  100 , the monitor window  400  can change. This feature will now be explained with reference to  FIGS. 31 and 32 . 
     In particular,  FIG. 31  is a flowchart according to an embodiment of the present invention, and  FIG. 32  is a diagram of a front side of the mobile terminal  100  and a display unit of the display device  200  according to an embodiment of the present invention. First, an ‘event’ corresponds to a specific function being executed without a user input in the mobile terminal  100  during a normal operation of the mobile terminal  100 . For example, the event can include one of a phone call reception, a message reception and the like. The following description assumes the event includes the phone call reception, by which the present embodiment is non-limited. 
     Referring to  FIGS. 31 and 32 , as mentioned in the foregoing description, the mobile terminal  100  and the display device  200  can be connected to each other (S 311 ). If so, the monitor window  400  is generated from the second display  251  of the display device  200  and the second screen image  500  can be displayed on the monitor window  400 . 
     Afterwards, a phone call reception even can occur in the mobile terminal  100 . If so, the first screen image  300  on the display unit  151  of the mobile terminal  100  can be changed into an image corresponding to the phone call reception event. Accordingly, the second screen image  500  on the second display  251  of the display device  200  can be changed into the image corresponding to the phone call reception event, which is optional. 
     If so, the first controller  180  of the mobile terminal  100  determines whether the mobile terminal  100  is currently in a mute mode. In this instance, the mute mode may mean the mode set for muting an alarm sound indicating an occurrence of an event in the mobile terminal  100 . Also, the mute mode can include a vibration mode for generating a vibration indicating an occurrence of an event in the mobile terminal  100 . 
     As a result of the determination, if the mobile terminal  100  is in the mute mode, the first controller  180  of the mobile terminal  100  provides the display device  200  with a first control signal indicating that the event has occurred in the mobile terminal  100  and that the mobile terminal  100  is in the mute mode. 
     Then, in response to the first control signal, the second controller  280  of the display device  200  controls the monitor window  400  to be visually changed in the second display unit  251 . Referring to  FIG. 32  ( 32 - 2 ), the monitor window  400  vibrates on the second display unit  251  according to the first control signal, by which the present embodiment is non-limited. Optionally, at least one of a color, shape and size of the monitor window  400  can be changed in response to the first control signal. 
     On the contrary, as a result of the determination, if the mobile terminal  100  is not in the mute mode, the first controller  180  of the mobile terminal  100  provides the display device  200  with a second control signal indicating that the event has occurred in the mobile terminal  100  and that the mobile terminal  100  is not in the mute mode. 
     Then, in response to the second control signal, the second controller  280  of the display device  200  controls the monitor window  400  to be maintained intact without being visually changed in the second display unit  251 . 
     If the mobile terminal  100  is not in the mute mode, the first controller  180  of the mobile terminal  100  does not send any control signal to the display device  200 . Therefore, the second controller  280  of the display device  200  can control the monitor window  400  to keep being displayed as it is. 
     As mentioned in the foregoing description, the present invention is applicable to such a mobile terminal as a mobile phone, a smart phone, a notebook computer e.g., a laptop), a digital broadcast terminal, a PDA (personal digital assistants), a PMP (portable multimedia player), a navigation system and the like and/or such a display device as a notebook computer (e.g., laptop), a tablet computer, a desktop computer, a television set (e.g., a digital TV set, a smart TV set, etc.) and the like. 
     It will be apparent to those skilled in the art that various modifications and variations can be specified into other form(s) without departing from the spirit or scope of the inventions. 
     In addition, the above-described methods can be implemented in a program recorded medium as computer-readable codes. The computer-readable media include all kinds of recording devices in which data readable by a computer system are stored. The computer-readable media include ROM, RAM, CD-ROM, magnetic tapes, floppy discs, optical data storage devices, and the like for example and also include carrier-wave type implementations (e.g., transmission via Internet). And, the computer can include the controller  180  of the terminal. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.