Patent Publication Number: US-10334200-B2

Title: Wireless device and wireless system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Pursuant to 35 U.S.C. § 119(a), this application claims the benefit of earlier filing date and right of priority to Korean Patent Application No. 10-2016-0128236, filed on Oct. 5, 2016, the contents of which are hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     The present invention relates to a wireless device and a wireless system, which provide an original image and a zoomed-in partial image of the original image on a single screen during screen mirroring. 
     With the recent development of information communication technologies, various wireless communication technologies are under development. Among them, a wireless local area network (WLAN) is a technology for wirelessly accessing Internet in homes, businesses, or specific service providing areas based on a wireless frequency technique by using portable terminals such as Personal Digital Assistants (PDAs), laptop computers, and Portable Multimedia Players (PMPs). 
     As a direct communication technology for allowing devices to be connected to each other easily without an access point (AP) that is required in a WLAN system, the introduction of Wi-Fi Direct or Wi-Fi peer-to-peer (P2P) is discussed. According to a Wi-Fi Direct standard technology, devices are connected without complex setting processes and in order to provide various services to users, data exchanging operations at a communication speed of a typical WLAN system can be supported. 
     Various Wi-Fi supporting devices have been used recently, and among them, the number of Wi-Fi Direct supporting devices for communication between Wi-Fi devices without requiring APs has been increasing. The Wi-Fi Alliance (WFA) discusses a technology for introducing a platform that supports various services using Wi-Fi Direct link (for example, send, play, display, and print). This can be referred to as Wi-Fi Direct Service (WFDS). 
     Display service in WFDS is a service for allowing screen sharing between P2P devices. The screen sharing service is also referred to as a screen mirroring technique in that a wireless device displays the same image through image transmission. 
     However, since the aspect ratio or resolution does not fit during image transmission between P2P devices, an existing screen sharing service includes and delivers an unnecessary image such as a black image (or a letter box) at the top/bottom or left/right. Accordingly, due to an unnecessary image that is displayed in addition to an image displayed by a source device, it is in the way of users watching the image. 
     Additionally, when an original image displayed on the source device includes a small picture, map, or letter, a user manipulation is difficult due to a small screen of the source device. 
     Additionally, when an image displayed on the source device is zoomed in, the zoomed-in image can also be displayed on the sink device, but the quality of the image is degraded. 
     SUMMARY 
     According to the present invention, when a screen sharing service is provided during WFDS, a part of information displayed on a small screen of a source device is zoomed in on a sink device. 
     According to the present invention, when the screen sharing service is provided during WFDS, the sink device receives an entire image and a partial zoomed-in image constituting the entire image from the source device by streaming and provides the received entire image and the received partial zoomed-in image. 
     According to the present invention, when the screen sharing service is provided during WFDS, a partial image of the entire image is zoomed in without degradation in image quality. 
     According to the present invention, when the screen sharing service is provided during WFDS, a black image inserted due to a mismatched resolution or screen ratio is not displayed. 
     In one embodiment, a first wireless device that supports a Wi-Fi direct service includes: a display unit configured to display an entire image of content being displayed by a second wireless device; a communication unit configured to perform a connection setup with the second wireless device; and a processor configured to control the display unit and the communication unit, wherein the processor receives a zoom-in request signal for zooming in a partial image included in the entire image and receives data of the entire image and data of a zoomed-in partial image corresponding to the partial image from the second wireless device based on the zoom-in request signal. 
     In another embodiment, a wireless system which supports a Wi-Fi direct service includes: a first wireless device configured to display an entire image of content being displayed by a second wireless device, receive a zoom-in request signal for zooming in a partial image included in the entire image, and receive data of the entire image and data of a zoomed-in partial image corresponding to the partial image from the second wireless device based on the zoom-in request signal; and the second wireless device configured to display the entire image of the content and transmit the data of the entire image and the data of the zoomed-in partial image to the first wireless device according to a zoom-in request message received from the wireless device. 
     According to various embodiments of the present invention, when the screen sharing service is provided during the WFD service, a user can more clearly view information, which is difficult to confirm in the source device, on a large screen. 
     According to various embodiments of the present invention, when the screen sharing service is provided during the WFD service, a user can view a partial image with the same resolution as that of an original image received from the source device. 
     According to various embodiments of the present invention, when the screen sharing service is provided during the WFD service, a black image inserted due to a mismatched resolution or screen ratio is removed, thereby preventing a user from viewing unnecessary images. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram illustrating a configuration of a display device according to an embodiment of the present invention. 
         FIG. 2  is a block diagram illustrating a remote control device according to an embodiment of the present invention. 
         FIG. 3  is a view illustrating an actual configuration of a remote control device according to an embodiment of the present invention. 
         FIG. 4  is a view of utilizing a remote control device according to an embodiment of the present invention. 
         FIG. 5  is a block diagram illustrating a mobile terminal according to an embodiment of the present invention. 
         FIG. 6  is a ladder diagram illustrating a process that a WFD session is established between a WFD source and a WFD sink and screen sharing service is provided according to an embodiment of the present invention. 
         FIGS. 7A to 7D  are tables illustrating resolution information that a WFD sink transmits to a WFD source according to an embodiment of the present invention. 
         FIGS. 8 to 11  are views illustrating a process of performing a magic zoom function during screen sharing between a WFD source and a WFD sink according to an embodiment of the present invention. 
         FIGS. 12 to 14  are views illustrating a process of performing a magic zoom function during screen sharing between a WFD source and a WFD sink according to another embodiment of the present invention. 
         FIGS. 15 to 17  are views illustrating a process of performing a magic zoom function during screen sharing between a WFD source and a WFD sink according to further another embodiment of the present invention. 
         FIG. 18  is a block diagram illustrating a configuration of a wireless device according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, embodiments relating to the present invention will be described in detail with reference to the accompanying drawings. The suffixes “module” and “unit” for components used in the description below are assigned or mixed in consideration of easiness in writing the specification and do not have distinctive meanings or roles by themselves. 
     A display device according to an embodiment of the present invention, for example, as an artificial display device that adds a computer supporting function to a broadcast receiving function, can have an easy-to-use interface such as a writing input device, a touch screen, or a spatial remote controller as an Internet function is added while fulfilling the broadcast receiving function. Then, with the support of a wired or wireless Internet function, it is possible to perform an e-mail, web browsing, banking, or game function in access to Internet and computers. In order to perform such various functions, standardized general purpose OS can be used. 
     Accordingly, since various applications are freely added or deleted on a general purpose OS kernel, a display device described herein, for example, can perform various user-friendly functions. The display device, in more detail, can be a network TV, Hybrid Broadcast Broadband TV (HBBTV), smart TV, light-emitting diode (LED) TV, organic light-emitting diode (OLED) TV, and so on and in some cases, can be applied to a smartphone. 
       FIG. 1  is a block diagram illustrating a configuration of a display device according to an embodiment of the present invention. 
     Referring to  FIG. 1 , a display device  100  can include a broadcast reception unit  130 , an external device interface unit  135 , a storage unit  140 , a user interface unit  150 , a control unit  170 , a wireless communication unit  173 , a display unit  180 , an audio output unit  185 , and a power supply unit  190 . 
     The broadcast reception unit  130  can include a tuner  131 , a demodulation unit  132 , and a network interface unit  133 . 
     The tuner  131  can select a specific broadcast channel according to a channel selection command. The tuner  131  can receive broadcast signals for the selected specific broadcast channel. 
     The demodulation unit  132  can divide the received broadcast signals into video signals, audio signals, and broadcast program related data signals and restore the divided video signals, audio signals, and data signals to an output available form. 
     The external device interface unit  135  can receive an application or an application list in an adjacent external device and deliver it to the control unit  170  or the storage unit  140 . 
     The external device interface unit  135  can provide a connection path between the display device  100  and an external device. The external device interface unit  135  can receive at least one an image or audio output from an external device that is wirelessly or wiredly connected to the display device  100  and deliver it to the control unit  170 . The external device interface unit  135  can include a plurality of external input terminals. The plurality of external input terminals can include an RGB terminal, at least one High Definition Multimedia Interface (HDMI) terminal, and a component terminal. 
     An image signal of an external device input through the external device interface unit  135  can be output through the display unit  180 . A sound signal of an external device input through the external device interface unit  135  can be output through the audio output unit  185 . 
     An external device connectable to the external device interface unit  135  can be one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB Memory, and a home theater system, but this is just exemplary. 
     The network interface unit  133  can provide an interface for connecting the display device  100  to a wired/wireless network including the Internet network. The network interface unit  133  can transmit or receive data to or from another user or another electronic device through an accessed network or another network linked to the accessed network. 
     Additionally, some content data stored in the display device  100  can be transmitted to a user or an electronic device, which is selected from other users or other electronic devices pre-registered in the display device  100 . 
     The network interface unit  133  can access a predetermined webpage through an accessed network or another network linked to the accessed network. That is, the network interface unit  133  can transmit or receive data to or from a corresponding server by accessing a predetermined webpage through the network. 
     Then, the network interface unit  133  can receive contents or data provided from a content provider or a network operator. That is, the network interface unit  133  can receive contents such as movies, advertisements, games, VODs, and broadcast signals, which are provided from a content provider or a network provider, through network and information relating thereto. 
     Additionally, the network interface unit  133  can receive firmware update information and update files provided from a network operator and transmit data to an Internet or content provider or a network operator. 
     The network interface unit  133  can select and receive a desired application among applications open to the air, through network. 
     The storage unit  140  can store signal-processed image, voice, or data signals stored by a program in order for each signal processing and control in the control unit  170 . 
     Additionally, the storage unit  140  can perform a function for temporarily storing image, voice, or data signals output from the external device interface unit  135  or the network interface unit  133  and can store information on a predetermined image through a channel memory function. 
     The storage unit  140  can store an application or an application list input from the external device interface unit  135  or the network interface unit  133 . 
     The display device  100  can play content files (for example, video files, still image files, music files, document files, application files, and so on) stored in the storage unit  140  and provide them to a user. 
     The user interface unit  150  can deliver signals input by a user to the control unit  170  or deliver signals from the control unit  170  to a user. For example, the user interface unit  150  can receive or process control signals such as power on/off, channel selection, and screen setting from the remote control device  200  or transmit control signals from the control unit  170  to the remote control device  200  according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF), and IR. 
     Additionally, the user interface unit  150  can deliver, to the control unit  170 , control signals input from local keys (not shown) such as a power key, a channel key, a volume key, and a setting key. 
     Image signals that are image-processed in the control unit  170  can be input to the display unit  180  and displayed as an image corresponding to corresponding image signals. Additionally, image signals that are image-processed in the control unit  170  can be input to an external output device through the external device interface unit  135 . 
     Voice signals processed in the control unit  170  can be output to the audio output unit  185 . Additionally, voice signals processed in the control unit  170  can be input to an external output device through the external device interface unit  135 . 
     Besides that, the control unit  170  can control overall operations in the display device  100 . Additionally, the control unit  170  can control the display device  100  by a user command or internal program input through the user interface unit  150  and download a desired application or application list into the display device  100  in access to network. 
     The control unit  170  can output channel information selected by a user together with processed image or voice signals through the display unit  180  or the audio output unit  185 . 
     Additionally, according to an external device image playback command received through the user interface unit  150 , the control unit  170  can output image signals or voice signals of an external device such as a camera or a camcorder, which are input through the external device interface unit  135 , through the display unit  180  or the audio output unit  185 . 
     Moreover, the control unit  170  can control the display unit  180  to display images and control broadcast images input through the tuner  131 , external input images input through the external device interface unit  135 , images input through the network interface unit, or images stored in the storage unit  140  to be displayed on the display unit  180 . In this case, an image displayed on the display unit  180  can be a still image or video and also can be a 2D image or a 3D image. 
     Additionally, the control unit  170  can play content stored in the display device  100 , received broadcast content, and external input content input from the outside, and the content can be in various formats such as broadcast images, external input images, audio files, still images, accessed web screens, and document files. 
     Moreover, the wireless communication unit  173  can perform a wired or wireless communication with an external electronic device. The wireless communication unit  173  can perform short-range communication with an external device. For this, the wireless communication unit  173  can support short-range communication by using at least one of Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, and Wireless Universal Serial Bus (USB) technologies. The wireless communication unit  173  can support wireless communication between the display device  100  and a wireless communication system, between the display device  100  and another display device  100 , or between networks including the display device  100  and another display device  100  (or an external server) through wireless area networks. The wireless area networks can be wireless personal area networks. 
     Herein, the other display device  100  can be a mobile terminal such as a wearable device (for example, a smart watch, a smart glass, and a head mounted display (HMD)) or a smartphone, which is capable of exchanging data (or inter-working) with the display device  100 . The wireless communication unit  173  can detect (or recognize) a communicable wearable device around the display device  100 . Furthermore, if the detected wearable device is a device authenticated to communicate with the display device  100 , the control unit  170  can transmit at least part of data processed in the display device  100  to the wearable device through the wireless communication unit  173 . Accordingly, a user of the wearable device can use the data processed in the display device  100  through the wearable device. 
     The display unit  180  can convert image signals, data signals, or on-screen display (OSD) signals, which are processed in the control unit  170 , or images signals or data signals, which are received in the external device interface unit  135 , into R, G, and B signals to generate driving signals. 
     Furthermore, the display device  100  shown in  FIG. 1  is just one embodiment of the present invention and thus, some of the components shown can be integrated, added, or omitted according to the specification of the actually implemented display device  100 . 
     That is, if necessary, two or more components can be integrated into one component or one component can be divided into two or more components and configured. Additionally, a function performed by each block is to describe an embodiment of the present invention and its specific operation or device does not limit the scope of the present invention. 
     According to another embodiment of the present invention, unlike  FIG. 1 , the display device  100  can receive images through the network interface unit  133  or the external device interface unit  135  and play them without including the tuner  131  and the demodulation unit  132 . 
     For example, the display device  100  can be divided into an image processing device such as a set-top box for receiving broadcast signals or contents according to various network services and a content playback device for playing contents input from the image processing device. 
     In this case, an operating method of a display device according to an embodiment of the present invention described below can be performed by one of the display device described with reference to  FIG. 1 , an image processing device such as the separated set-top box, and a content playback device including the display unit  180  and the audio output unit  185 . 
     Then, referring to  FIGS. 2 and 3 , a remote control device is described according to an embodiment of the present invention. 
       FIG. 2  is a block diagram illustrating a remote control device according to an embodiment of the present invention and  FIG. 3  is a view illustrating an actual configuration of a remote control device according to an embodiment of the present invention. 
     First, referring to  FIG. 2 , a remote control device  200  can include a fingerprint recognition unit  210 , a wireless communication unit  220 , a user input unit  230 , a sensor unit  240 , an output unit  250 , a power supply unit  260 , a storage unit  270 , a control unit  280 , and a sound acquisition unit  290 . 
     Referring to  FIG. 2 , the wireless communication unit  220  transmits/receives signals to/from an arbitrary any one of display devices according to the above-mentioned embodiments of the present invention. 
     The remote control device  200  can include a radio frequency (RF) module  221  for transmitting/receiving signals to/from the display device  100  according to the RF communication standards and an IR module  223  for transmitting/receiving signals to/from the display device  100  according to the IR communication standards. Additionally, the remote control device  200  can include a Bluetooth module  225  for transmitting/receiving signals to/from the display device  100  according to the Bluetooth communication standards. Additionally, the remote control device  200  can include a Near Field Communication (NFC) module  227  for transmitting/receiving signals to/from the display device  100  according to the NFC communication standards and a WLAN module  229  for transmitting/receiving signals to/from the display device  100  according to the Wireless LAN (WLAN) communication standards. 
     Additionally, the remote control device  200  can transmit signals containing information on a movement of the remote control device  200  to the display device  100  through the wireless communication unit  220 . 
     Moreover, the remote control device  200  can receive signals transmitted from the display device  100  through the RF module  221  and if necessary, can transmit a command on power on/off, channel change, and volume change to the display device  100  through the IR module  223 . 
     The user input unit  230  can be configured with a keypad button, a touch pad, or a touch screen. A user can manipulate the user input unit  230  to input a command relating to the display device  100  to the remote control device  200 . If the user input unit  230  includes a hard key button, a user can input a command relating to the display device  100  to the remote control device  200  through the push operation of the hard key button. This will be described with reference to  FIG. 3 . 
     Referring to  FIG. 3 , the remote control device  200  can include a plurality of buttons. The plurality of buttons can include a fingerprint recognition button  212 , a power button  231 , a home button  232 , a live button  233 , an external input button  234 , a voice adjustment button  235 , a voice recognition button  236 , a channel change button  237 , a check button  238 , and a back button  239 . 
     The fingerprint recognition button  212  can be a button for recognizing a user&#39;s fingerprint. According to an embodiment of the present invention, the fingerprint recognition button  212  can perform a push operation and receive a push operation and a fingerprint recognition operation. The power button  231  can be button for turning on/off the power of the display device  100 . The home button  232  can be a button for moving to the home screen of the display device  100 . The live button  233  can be a button for displaying live broadcast programs. The external input button  234  can be a button for receiving an external input connected to the display device  100 . The voice adjustment button  235  can be a button for adjusting the size of a volume output from the display device  100 . The voice recognition button  236  can be a button for receiving user&#39;s voice and recognizing the received voice. The channel change button  237  can be a button for receiving broadcast signals of a specific broadcast channel. The check button  238  can be a button for selecting a specific function and the back button  239  can be a button for returning to a previous screen. 
     Again, referring to  FIG. 2 , if the user input unit  230  includes a touch screen, a user can touch a soft key of the touch screen to input a command relating to the display device  100  to the remote control device  200 . Additionally, the user input unit  230  can include various kinds of input means manipulated by a user, for example, a scroll key and a jog key, and this embodiment does not limit the scope of the present invention. 
     The sensor unit  240  can include a gyro sensor  241  or an acceleration sensor  243  and the gyro sensor  241  can sense information on a movement of the remote control device  200 . 
     For example, the gyro sensor  241  can sense information on an operation of the remote control device  200  on the basis of x, y, and z axes and the acceleration sensor  243  can sense information on a movement speed of the remote control device  200 . Moreover, the remote control device  200  can further include a distance measurement sensor and sense a distance with respect to the display unit  180  of the display device  100 . 
     The output unit  250  can output image or voice signals in response to manipulation of the user input unit  230  or image or voice signals corresponding to signals transmitted from the display device  100 . A user can recognize whether the user input unit  230  is manipulated or the display device  100  is controlled through the output unit  250 . 
     For example, the output unit  250  can include an LED module  251  for flashing, a vibration module  253  for generating vibration, a sound output module  255  for outputting sound, or a display module  257  for outputting an image, if the user input unit  230  is manipulated or signals are transmitted/received to/from the display device  100  through the wireless communication unit  220 . 
     Additionally, the power supply unit  260  supplies power to the remote control device  200  and if the remote control device  200  does not move for a predetermined time, stops the power supply, so that power waste can be reduced. The power supply unit  260  can resume the power supply if a predetermined key provided at the remote control device  200  is manipulated. 
     The storage unit  270  can store various kinds of programs and application data necessary for control or operation of the remote control device  200 . If the remote control device  200  transmits/receives signals wirelessly through the display device  100  and the RF module  221 , the remote control device  200  and the display device  100  transmits/receives signals through a predetermined frequency band. 
     The control unit  280  of the remote control device  200  can store, in the storage unit  270 , information on a frequency band for transmitting/receiving signals to/from the display device  100  paired with the remote control device  200  and refer to it. 
     The control unit  280  controls general matters relating to control of the remote control device  200 . The control unit  280  can transmit a signal corresponding to a predetermined key manipulation of the user input unit  230  or a signal corresponding to movement of the remote control device  200  sensed by the sensor unit  240  to the display device  100  through the wireless communication unit  220 . 
     Additionally, the sound acquisition unit  290  of the remote control device  200  can obtain voice. The sound acquisition unit  290  can include at least one microphone and obtain voice through the microphone  291 . 
       FIG. 4  is a view of utilizing a remote control device according to an embodiment of the present invention.  FIG. 4( a )  illustrates that a pointer  205  corresponding to the remote control device  200  is displayed on the display unit  180 . 
     A user can move or rotate the remote control device  200  vertically or horizontally. The pointer  205  displayed on the display unit  180  of the display device  100  corresponds to a movement of the remote control device  200 . Since the corresponding pointer  205  is moved and displayed according to a movement on a 3D space as show in the drawing, the remote control device  200  can be referred to as a spatial remote controller. 
       FIG. 4( b )  illustrates that if a user moves the remote control device  200 , the pointer  205  displayed on the display unit  180  of the display device  100  is moved to the left according to the movement of the remote control device  200 . 
     Information on a movement of the remote control device  200  detected through a sensor of the remote control device  200  is transmitted to the display device  100 . The display device  100  can calculate the coordinates of the pointer  205  from the information on the movement of the remote control device  200 . The display device  100  can display the pointer  205  to match the calculated coordinates. 
       FIG. 4( c )  illustrates that while a specific button in the remote control device  200  is pressed, a user moves the remote control device  200  away from the display unit  180 . Thus, a selection area in the display unit  180  corresponding to the pointer  205  can be zoomed in and displayed larger. 
     On the other hand, if a user moves the remote control device  200  close to the display unit  180 , a selection area in the display unit  180  corresponding to the pointer  205  can be zoomed out and displayed in a reduced size. 
     On the other hand, if the remote control device  200  is moved away from the display unit  180 , a selection area can be zoomed out and if the remote control device  200  is moved closer to the display unit  180 , a selection area can be zoomed in. 
     Additionally, if a specific button in the remote control device  200  is pressed, recognition of a vertical or horizontal movement can be excluded. That is, if the remote control device  200  is moved away from or closer to the display unit  180 , the up, down, left, or right movement cannot be recognized and only the back and forth movement can be recognized. While a specific button in the remote control device  200  is not pressed, only the pointer  205  is moved according to the up, down, left or right movement of the remote control device  200 . 
     Moreover, the moving speed or moving direction of the pointer  205  can correspond to the moving speed or moving direction of the remote control device  200 . 
     Furthermore, a pointer in this specification means an object displayed on the display unit  180  in response to an operation of the remote control device  200 . Accordingly, besides an arrow form displayed as the pointer  205  in the drawing, various forms of objects are possible. For example, the above concept includes a point, a cursor, a prompt, and a thick outline. Then, the pointer  205  can be displayed in correspondence to one point of a horizontal axis and a vertical axis on the display unit  180  and also can be displayed in correspondence to a plurality of points such as a line and a surface. 
     Then, a configuration of a mobile terminal according to an embodiment of the present invention will be described with reference to  FIG. 5 .  FIG. 5  is a block diagram illustrating a mobile terminal according to an embodiment of the present invention. 
     The mobile terminal  500  can include a wireless communication unit  510 , an input unit  520 , a sensing unit  540 , an output unit  550 , an interface unit  560 , a memory unit  570 , a control unit  580 , and a power supply unit  590 . In implementing a mobile terminal, all components shown in  FIG. 5  may not be necessary, so that a mobile terminal described in this specification can include components less or more than the components listed above. 
     In more detail, the wireless communication unit  510  in the components can include at least one module allowing wireless communication between the mobile terminal  500  and a wireless communication system, between the mobile terminal  500  and another mobile terminal  500 , or between the mobile terminal  500  and an external server. Additionally, the wireless communication unit  510  can include at least one module connecting the mobile terminal  500  to at least one network. 
     The wireless communication unit  510  can include at least one of a broadcast receiving module  511 , a mobile communication module  512 , a wireless Internet module  513 , a short-range communication module  514 , and a location information module  515 . 
     The input unit  520  can include a camera  521  or an image input unit for image signal input, a microphone  522  or an audio input unit for receiving audio signal input, and a user input unit  523  (for example, a touch key and a mechanical key) for receiving information from a user. Voice data or image data collected by the input unit  520  are analyzed and processed as a user&#39;s control command. 
     The sensing unit  540  can include at least one sensor for sensing at least one of information in a mobile terminal, environmental information around a mobile terminal, and user information. For example, the sensing unit  540  can include at least one of a proximity sensor  541 , an illumination sensor  542 , a touch sensor, an acceleration sensor, a magnetic sensor, a G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared (IR) sensor, a finger scan sensor, an ultrasonic sensor, an optical sensor (for example, the camera  521 ), a microphone (for example, the microphone  522 ), a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation sensor, a thermal sensor, and a gas sensor), or a chemical sensor (for example, an electronic noise, a healthcare sensor, and a biometric sensor). Moreover, a mobile terminal disclosed in this specification can combine information sensed by at least two or more sensors among such sensors and utilize it. 
     The output unit  550  is used to generate a visual, auditory, or haptic output and can include at least one of a display unit  551 , a sound output module  552 , a haptic module  553 , and an optical output unit  554 . The display unit  551  can be formed with a mutual layer structure with a touch sensor or formed integrally, so that a touch screen can be implemented. Such a touch screen can serve as the user input unit  523  providing an input interface between the mobile terminal  500  and a user and an output interface between the mobile terminal  500  and a user at the same time. 
     The interface unit  560  can serve as a path to various kinds of external devices connected to the mobile terminal  500 . The interface unit  560  can include at least one of a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port connecting a device equipped with an identification module, an audio Input/Output (I/O) port, a video I/O port, or an earphone port. When an external device is connected to the interface unit  560 , the mobile terminal  500  can perform an appropriate control relating to the connected external device. 
     Additionally, the memory unit  570  can store data supporting various functions of the mobile terminal  500 . The memory unit  570  can store a plurality of application programs (for example, application programs or applications) running on the mobile terminal  500  and also data and commands for operations of the mobile terminal  500 . At least part of such an application program can be downloaded from an external server through wireless communication. Additionally, at least part of such an application program can be included in the mobile terminal  500  from the time of shipment in order to perform a basic function (for example, an incoming call, a transmission function, and a message reception) of the mobile terminal  500 . Moreover, an application program can be stored in the memory unit  570  and installed on the mobile terminal  500 , so that it can run to perform an operation (or a function) of the mobile terminal  500  by the control unit  580 . 
     The control unit  580  can control overall operations of the mobile terminal  500  generally besides an operation relating to the application program. The control unit  580  can provide appropriate information or functions to a user or process them by processing signals, data, and information input/output through the above components or executing application programs stored in the memory unit  570 . 
     Additionally, in order to execute an application program stored in the memory unit  570 , the control unit  580  can control at least part of the components shown in  FIG. 5 . Furthermore, in order to execute the application program, the control unit  580  can combine at least two of the components in the mobile terminal  500  and operate it. 
     The power supply unit  590  can receive external power or internal power under a control of the control unit  580  and supply power to each component in the mobile terminal  500 . The power supply unit  590  includes a battery and the battery can be a built-in battery or a replaceable battery. 
     At least part of each component can operate cooperatively in order to implement operations, controls, or control methods of the mobile terminal  500  according to various embodiments of the present invention described below. Additionally, the operations, controls, or control methods of the mobile terminal  500  can be implemented on the mobile terminal  500  by executing at least one application program stored in the memory unit  570 . 
     Hereinafter, prior to examining various embodiments implemented through the mobile terminal  500 , the above-listed components are described in more detail with reference to  FIG. 5 . 
     First, in describing the wireless communication unit  510 , the broadcast receiving module  511  of the wireless communication unit  510  can receive a broadcast signal and/or broadcast related information from an external broadcast management server through a broadcast channel. The broadcast channel can include a satellite channel and a terrestrial channel. At least two broadcast receiving modules for simultaneous broadcast reception for at least two broadcast channels or broadcast channel switching can be provided to the mobile terminal  500 . 
     The mobile communication module  512  can transmit/receive a wireless signal to/from at least one of a base station, an external terminal, and a server on a mobile communication network established according to the technical standards or communication methods for mobile communication (for example, Global System for Mobile communication (GSM), Code Division Multi Access (CDMA), Code Division Multi Access 2000 (CDMA2000), Enhanced Voice-Data Optimized or Enhanced Voice-Data Only (EV-DO), Wideband CDMA (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), and Long Term Evolution-Advanced (LTE-A)). 
     The wireless signal can include various types of data according to a voice call signal, a video call signal, or text/multimedia message transmission. 
     The wireless Internet module  513  refers to a module for wireless Internet access and can be built in or external to the mobile terminal  500 . The wireless Internet module  513  can be configured to transmit/receive a wireless signal in a communication network according to wireless internet technologies. 
     The wireless Internet technology can include Wireless LAN (WLAN), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, Digital Living Network Alliance (DLNA), Wireless Broadband (WiBro), World Interoperability for Microwave Access (WiMAX), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), and Long Term Evolution-Advanced (LTE-A) and the wireless Internet module  513  transmits/receives data according to at least one wireless Internet technology including any Internet technologies not listed above. 
     From the viewpoint that wireless Internet access by WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE, and LTE-A is achieved through a mobile communication network, the wireless Internet module  513  performing wireless Internet access through the mobile communication network can be understood as one type of the mobile communication module  512 . 
     The short-range communication module  514  can support short-range communication by using at least one of Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, and Wireless Universal Serial Bus (USB) technologies. The short-range communication module  514  can support wireless communication between the mobile terminal  500  and a wireless communication system, between the mobile terminal  500  and another mobile terminal  500 , or between networks including the mobile terminal  500  and another mobile terminal  500  (or an external server) through wireless area networks. The wireless area networks can be wireless personal area networks. 
     Here, the other mobile terminal  500  can be a wearable device (for example, a smart watch, a smart glass, and an HMD) that is capable of exchanging data (or interworking) with the mobile terminal  500 . The short-range communication module  514  can detect (or recognize) a wearable device around the mobile terminal  500 , which is capable of communicating with the mobile terminal  500 . Furthermore, if the detected wearable device is a device authenticated to communicate with the mobile terminal  500 , the control unit  580  can transmit at least part of data processed in the mobile terminal  500  to the wearable device through the short-range communication module  514 . Accordingly, a user of the wearable device can use the data processed in the mobile terminal  500  through the wearable device. For example, according thereto, if a call is received by the mobile terminal  500 , a user can perform a phone call through the wearable device or if a message is received by the mobile terminal  500 , a user can check the received message. 
     The location information module  515  is a module for obtaining the location (or the current location) of a mobile terminal and its representative examples include a global positioning system (GPS) module or a Wi-Fi module. For example, the mobile terminal  500  can obtain its position by using a signal transmitted from a GPS satellite through the GPS module. As another example, the mobile terminal  500  can obtain its position on the basis of information of a wireless access point (AP) transmitting/receiving a wireless signal to/from the Wi-Fi module, through the Wi-Fi module. If necessary, the location information module  515  can perform a function of another module in the wireless communication unit  510  in order to obtain data on the location of the mobile terminal substitutionally or additionally. The location information module  515  is a module for obtaining the position (or the current position) of the mobile terminal and is not limited to a module directly calculating and obtaining the position of the mobile terminal. 
     Then, the input unit  520  is used for inputting image information (or signal), audio information (or signal), data, or information inputted from a user and the mobile terminal  500  can include at least one camera  521  in order for inputting image information. The camera  521  processes image frames such as a still image or a video obtained by an image sensor in a video call mode or a capturing mode. The processed image frame can be displayed on the display unit  551  or stored in the memory unit  570 . Moreover, a plurality of cameras  521  equipped in the mobile terminal  500  can be arranged in a matrix structure and through the camera  521  having such a matrix structure, a plurality of image information having various angles or focuses can be input to the input terminal  500 . Additionally, the plurality of cameras  521  can be arranged in a stereo structure to obtain the left and right images for implementing a three-dimensional image. 
     The microphone  522  processes external sound signals as electrical voice data. The processed voice data can be utilized variously according to a function (or an application program being executed) being performed in the mobile terminal  500 . Moreover, various noise canceling algorithms for removing noise occurring during the reception of external sound signals can be implemented in the microphone  522 . 
     The user input unit  523  is to receive information from a user and if information is input through the user input unit  523 , the control unit  580  can control an operation of the mobile terminal  500  according to the input information. The user input unit  523  can include a mechanical input means (or a mechanical key, for example, a button, a dome switch, a jog wheel, and a jog switch at the front, back or side of the mobile terminal  500 ) and a touch type input means. As one example, a touch type input means can include a virtual key, a soft key, or a visual key, which is displayed on a touch screen through software processing or can include a touch key disposed at a portion other than the touch screen. Moreover, the virtual key or visual key can have various forms and can be disposed on a touch screen and for example, can include graphic, text, icon, video, or a combination thereof. 
     Moreover, the sensing unit  540  can sense at least one of information in a mobile terminal, environmental information around a mobile terminal, and user information and can then generate a sensing signal corresponding thereto. On the basis of such a sensing signal, the control unit  580  can control the drive or control of the mobile terminal  500  or can perform data processing, functions, or operations relating to an application program installed in the mobile terminal  500 . Representative sensors among various sensors included in the sensing unit  540  will be described in more detail. 
     First, the proximity sensor  541  refers to a sensor detecting whether there is an object approaching a predetermined detection surface or whether there is an object around by using the strength of an electromagnetic field or infrared, without mechanical contact. The proximity sensor  541  can disposed in an inner area of a mobile terminal surrounded by the touch screen or around the touch screen. 
     Examples of the proximity sensor  541  can include a transmission-type photoelectric sensor, a direct reflective-type photoelectric sensor, a mirror reflective-type photoelectric sensor, a high-frequency oscillation-type proximity sensor, a capacitive-type proximity sensors, a magnetic-type proximity sensor, and an infrared proximity sensor. If the touch screen is a capacitive type, the proximity sensor  541  can be configured to detect the proximity of an object by changes in an electric field according to the proximity of the object having conductivity. In this case, the touch screen (or a touch sensor) itself can be classified as a proximity sensor. 
     Moreover, for convenience of description, an action for recognizing the position of an object on the touch screen as the object is close to the touch screen without contacting the touch screen is called “proximity touch” and an action that the object actually contacts the touch screen is called “contact touch.” A position that an object is proximity-touched on the touch screen is a position that the object vertically corresponds to the touch screen if the object is proximity-touched. The proximity sensor  541  can detect a proximity touch and a proximity touch pattern (for example, a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, and a proximity touch movement state). Moreover, the control unit  580  processes data (for information) corresponding to a proximity touch operation and a proximity touch pattern, detected through the proximity sensor  541 , and furthermore, can output visual information corresponding to the processed data on the touch screen. Furthermore, according to whether a touch for the same point on the touch screen is a proximity touch or a contact touch, the control unit  580  can control the mobile terminal  500  to process different operations or data (or information). 
     The touch sensor detects a touch (or a touch input) applied to the touch screen (or the display unit  551 ) by using at least one of various touch methods, for example, a resistive film method, a capacitive method, an infrared method, an ultrasonic method, and a magnetic field method. 
     For example, the touch sensor can be configured to convert a pressure applied to a specific portion of the touch screen or changes in capacitance occurring at a specific portion into electrical input signals. The touch sensor can be configured to detect a position and area that a touch target applying a touch on the touch screen touches the touch sensor, a pressured if touched, and a capacitance if touched. Here, the touch target, as an object applying a touch on the touch sensor, can be a finger, a touch pen, a stylus pen, or a pointer, for example. 
     In such a manner, if there is a touch input on the touch sensor, signal(s) corresponding thereto are sent to a touch controller. The touch controller processes the signal(s) and then transmits corresponding data to the control unit  580 . Therefore, the control unit  580  can recognize which area of the display unit  551  is touched. Herein, the touch controller can be an additional component separated from the control unit  580  or can be the control unit  580  itself. 
     Moreover, the control unit  580  can perform different controls or the same control according to types of a touch target touching the touch screen (or a touch key equipped separated from the touch screen). Whether to perform different controls or the same control according to types of a touch target can be determined according to a current operation state of the mobile terminal  500  or an application program in execution. 
     Moreover, the above-mentioned touch sensor and proximity sensor are provided separately or combined and can thus sense various types of touches, for example, short (or tap) touch), long touch, multi touch, drag touch, flick touch, pinch-in touch, pinch-out touch, swipe touch, and hovering touch for the touch screen. 
     The ultrasonic sensor can recognize position information of a detection target by using ultrasonic waves. Moreover, the control unit  580  can calculate the position of a wave source through information detected by an optical sensor and a plurality of ultrasonic sensors. The position of the wave source can be calculated by using the property that light is much faster than ultrasonic wave, that is, a time that light reaches an optical signal is much shorter than a time that ultrasonic wave reaches an ultrasonic sensor. In more detail, the position of the wave source can be calculated by using a time difference with a time that ultrasonic wave reaches by using light as a reference signal. 
     Moreover, the camera  521  described as a configuration of the input unit  520  can include at least one of a camera sensor (for example, CCD and CMOS), a photo sensor (or an image sensor), or a laser sensor. 
     The camera  521  and the laser sensor can be combined to detect a touch of a detection target for a three-dimensional image. The photo sensor can be stacked on a display device and is configured to scan a movement of a detection target close to the touch screen. In more detail, the photo sensor mounts a photo diode and a transistor (TR) in a row/column and scans content disposed on the photo sensor by using an electrical signal changing according to an amount of light applied to the photo diode. That is, the photo sensor can calculate the coordinates of a detection target according to the amount of change in light and through this, can obtain the position information of the detection target. 
     The display unit  551  can display (output) information processed in the mobile terminal  500 . For example, the display unit  551  can display execution screen information of an application program running on the mobile terminal  500  or user interface (UI) and graphic user interface (GUI) information according to such execution screen information. 
     Additionally, the display unit  551  can be configured as a three-dimensional display unit displaying a three-dimensional image. 
     A three-dimensional display method, for example, a stereoscopic method (a glasses method), an autostereoscopic (no glasses method), a projection method (a holographic method) can be applied to the three-dimensional display unit. 
     The sound output module  552  can output audio data received from the wireless communication unit  510  or stored in the memory unit  570  in a call signal reception or call mode, a recording mode, a voice recognition mode, or a broadcast reception mode. The sound output module  552  can output a sound signal relating to a function (for example, a call signal reception sound and a message reception sound) performed by the mobile terminal  500 . The sound output module  552  can include a receiver, a speaker, and a buzzer. 
     The haptic module  553  generates various haptic effects that a user can feel. A representative example of a haptic effect that the haptic module  553  generates is vibration. The intensity and pattern of vibration generated by the haptic module  553  can be controlled by a user&#39;s selection or a setting of a control unit. For example, the haptic module  553  can synthesize and output different vibrations or output different vibrations sequentially. 
     The haptic module  553  can generate various haptic effects, for example, effects by a pin arrangement moving vertical to a contact skin surface, injection power or suction power of air through an injection port or a suction port, rubbing a skin surface, electrode contact, stimulus of electrostatic force and effects by the reproduction of cold/warm sense by using a device absorbing or emitting heat. 
     The haptic module  553  can be implemented to deliver a haptic effect through a direct contact and also allow a user to feel a haptic effect through a muscle sense such as a finger or an arm. The haptic module  553  can be more than two according to a configuration aspect of the mobile terminal  500 . 
     The optical output unit  554  outputs a signal for notifying event occurrence by using light of a light source of the mobile terminal  500 . An example of an event occurring in the mobile terminal  500  includes message reception, call signal reception, missed calls, alarm, schedule notification, e-mail reception, and information reception through an application. 
     A signal output from the optical output unit  554  is implemented as a mobile terminal emits single color of multi-color to the front or the back. The signal output can be terminated if a mobile terminal detects user&#39;s event confirmation. 
     The interface unit  560  can serve as a path to all external devices connected to the mobile terminal  500 . The interface unit  560  can receive data from an external device, receive power and deliver it to each component in the mobile terminal  500 , or transmit data in the mobile terminal  500  to an external device. For example, the interface unit  560  can include a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port connecting a device equipped with an identification module, an audio I/O port, a video I/O port, and an earphone port. 
     Moreover, the identification module, as a chip storing various information for authenticating usage authority of the mobile terminal  500 , can include a user identity module (UIM), a subscriber identity module (SIM), and a universal subscriber identity module (USIM). A device equipped with an identification module (hereinafter referred to as an identification device) can be manufactured in a smart card form. Accordingly, the identification device can be connected to the terminal  500  through the interface unit  560 . 
     Additionally, if the mobile terminal  500  is connected to an external cradle, the interface unit  560  can become a path through which power of the cradle is supplied to the mobile terminal  500  or a path through which various command signals inputted from the cradle are delivered to the mobile terminal  500  by a user. The various command signals or the power input from the cradle can operate as a signal for recognizing that the mobile terminal  500  is accurately mounted on the cradle. 
     The memory unit  570  can store a program for an operation of the control unit  580  and can temporarily store input/output data (for example, a phone book, a message, a still image, and a video). The memory unit  570  can store data on various patterns of vibrations and sounds outputted during a touch input on the touch screen. 
     The memory unit  570  can include at least one type of storage medium among flash memory type, hard disk type, Solid State Disk (SSD) type, Silicon Disk Drive (SDD) type, multimedia card micro type, card type memory (for example, SD or XD memory type), random access memory (RAM) type, static random access memory (SRAM) type, read-only memory (ROM) type, electrically erasable programmable read-only memory (EEPROM) type, programmable read-only memory (PROM) type, magnetic memory type, magnetic disk type, and optical disk type. The mobile terminal  500  can operate in relation to a web storage performing a storage function of the memory unit  570  on Internet. 
     Moreover, as mentioned above, the control unit  580  can control operations relating to an application program and overall operations of the mobile terminal  500  in general. For example, if a state of the mobile terminal  500  satisfies set conditions, the control unit  580  can execute or release a lock state limiting an output of a control command of a user for applications. 
     Additionally, the control unit  580  can perform a control or processing relating to a voice call, data communication, and a video call can perform pattern recognition processing for recognizing handwriting input or drawing input on the touch screen as a text and an image, respectively. Furthermore, the control unit  580  can use at least one or a combination of the above components to perform a control in order to implement various embodiments described below on the mobile terminal  500 . 
     The power supply unit  590  can receive external power or internal power under a control of the control unit  580  and can then supply power necessary for an operation of each component. The power supply unit  590  includes a battery. The battery is a rechargeable built-in battery and can be detachably coupled to a terminal body in order for charging. 
     Additionally, the power supply unit  590  can include a connection port and the connection port can be configured as one example of the interface unit  560  to which an external charger supplying power for charging of the battery is electrically connected. 
     As another example, the power supply unit  590  can be configured to charge a battery through a wireless method without using the connection port. In this case, the power supply unit  590  can receive power from an external wireless power transmission device through at least one of an inductive coupling method based on a magnetic induction phenomenon, and a magnetic resonance coupling method based on an electromagnetic resonance phenomenon. 
     Moreover, various embodiments below can be implemented in a computer or device similar thereto readable medium by using software, hardware, or a combination thereof. 
     Then, a communication system using the mobile terminal  500  is described according to an embodiment of the present invention. 
     First, the communication system can use different wireless interfaces and/or physical layers. For example, a wireless interface available to the communication system can include Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Universal Mobile Telecommunications Systems (UMTS) (especially, Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-A), and Global System for Mobile Communications (GSM)). 
     Hereinafter, for convenience of description, description is made limited to CDMA. However, it is apparent that the present invention is applicable to all communication systems including Orthogonal Frequency Division Multiplexing (OFDM) wireless communication systems in addition to CDMA wireless communication systems. 
     The CDMA wireless communication system can include at least one terminal  500 , at least one base station (BS) (it can be referred to as Node B or Evolved Node B), at least one base station controllers (BSCs), and a mobile switching center (MSC). MSC can be configured to be connected to Public Switched Telephone Network (PSTN) and BSCs. BSCs can be connected being paired with a BS through a backhaul line. The backhaul line can be provided according to at least one of E1/T1, ATM, IP, PPP, Frame Relay, HDSL, ADSL, and xDSL. Accordingly, a plurality of BSCs can be included in a CDMA wireless communication system. 
     Each of a plurality of BSs can include at least one sensor and each sensor can include an omni-directional antenna or an antenna indicating a specific radial direction from a BS. Additionally, each sensor can include at least two antennas in various forms. Each BS can be configured to support a plurality of frequency allocations and each of the plurality of frequency allocations can have a specific spectrum (for example, 1.25 MHz, 5 MHz, and so on). 
     The intersection of a sector and a frequency allocation can be referred to as a CDMA channel. A BS can be referred to as a Base Station Transceiver Subsystem (BTS). In such a case, one BSC and at least one BS together can be referred to as “BS”. A BS can also represent “cell site”. Additionally, each of a plurality of sectors for a specific BS can be referred to as a plurality of cell sites. 
     A Broadcasting Transmitter (BT) transmits broadcast signals to the terminals  500  operating in a system. The broadcast receiving module  511  shown in  FIG. 5  is provided in the terminal  500  for receiving broadcast signals transmitted from the BT. 
     Additionally, GPS can be linked to a CDMA wireless communication system in order to check the location of the mobile terminal  500 . Then, a satellite helps obtaining the location of the mobile terminal  500 . Useful location information can be obtained by at least one satellite. Herein, the location of the mobile terminal  500  can be traced by using all techniques for tracing the location in addition to GPS tracking technique. Additionally, at least one GPS satellite can be responsible for satellite DMB transmission selectively or additionally. 
     The location information module  515  in the mobile terminal  500  is for detecting and calculating the position of the mobile terminal and its representative example can include a GPS module and a WiFi module. If necessary, the location information module  515  can perform a function of another module in the wireless communication unit  510  in order to obtain data on the location of the mobile terminal substitutionally or additionally. 
     The location information module  515  such as a GPS module can calculate information on a distance from at least three satellites and accurate time information and then apply triangulation to the calculated information, in order to accurately calculate the 3D current location information according to latitude, longitude, and altitude. A method for calculating location and time information by using three satellites and correcting errors of the calculated location and time information by using another one satellite is being widely used. Additionally, the GPS module  515  can speed information as continuously calculating the current location in real time. However, it is difficult to accurately measure the location of a mobile terminal by using a GPS module in a shadow area of a satellite signal such as a room. Accordingly, in order to compensate for the measurement of a GPS method, a WiFi Positioning System (WPS) can be utilized. 
     WPS is a technique for tracking the location of the mobile terminal  500  by using a WiFi module in the mobile terminal  500  and a wireless Access Point (AP) for transmitting or receiving wireless signals to or from the WiFi module and can mean a Wireless Local Area Network (WLAN) based location measurement technique using WiFi. 
     A WiFi location tracking system can include a WiFi location measurement server, a mobile terminal  500 , a wireless AP connected to the mobile terminal  500 , and a database for storing arbitrary wireless AP information. 
     The mobile terminal  500  in access to a wireless AP can transmit a location information request message to a WiFi location measurement server. 
     The WiFi location measurement server extracts information of a wireless AP connected to the mobile terminal  500  on the basis of a location information request message (or signal) of the mobile terminal  500 . Information of a wireless AP connected to the mobile terminal  500  can be transmitted to the WiFi location measurement server through the mobile terminal  500  or can be transmitted from a wireless AP to a WiFi location measurement server. 
     Based on the location information request message of the mobile terminal  500 , the extracted information of a wireless AP can be at least one of MAC Address, Service Set Identification (SSID), Received Signal Strength Indicator (RSSI), Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), channel information, Privacy, Network Type, Signal Strength, and Noise Strength. 
     As mentioned above, the WiFi position measurement server can extract wireless AP information corresponding to a wireless AP that the mobile terminal  500  access from a pre-established database by using information of the wireless AP connected to the mobile terminal  500 . At this point, information of arbitrary wireless APs stored in the database can information such as MAC Address, SSID, channel information, Privacy, Network Type, latitude and longitude coordinates of a wireless AP, a building name where a wireless AP is located, the number of floors, indoor detailed location (GPS coordinates available), the address of the owner of an AP, and phone numbers. At this point, in order to remove a mobile AP or a wireless AP provided using illegal MAC address during a measurement process, a WiFi location measurement server can extract only a predetermined number of wireless AP information in high RSSI order. 
     Then, the WiFi location measurement server can extract (or analyze) the location information of the mobile terminal  500  by using at least one wireless AP information extracted from the database. By comparing the included information and the received wireless AP information, location information of the mobile terminal  500  is extracted (or analyzed). 
     As a method of extracting (or analyzing) the location information of the mobile terminal  500 , a Cell-ID method, a finger-print method, a triangulation method, and a landmark method can be used. 
     The Cell-ID method is a method for determining the location of a wireless AP having the strongest signal intensity in neighbor wireless AP information that a mobile terminal collects as the location of the mobile terminal. Implementation is simple, no additional cost is required, and location information is obtained quickly but if the installation density of wireless APs is low, measurement precision is poor. 
     The finger-print method is a method for collecting signal intensity information by selecting a reference location from a service area and estimating the location through signal intensity information transmitted from a mobile terminal on the basis of the collected information. In order to use the finger-print method, there is a need to provide a database for storing propagation characteristics in advance. 
     The triangulation method is a method for calculating the location of a mobile terminal on the basis of a distance between coordinates of at least three wireless APs and a mobile terminal. In order to measure a distance between a mobile terminal and a wireless AP, a signal intensity converted into distance information, Time of Arrival (ToA), Time Difference of Arrival (TDoA), and Angle of Arrival (AoA) can be used. 
     The landmark method is a method for measuring the location of a mobile terminal by using a landmark transmitter knowing the location. 
     In addition to the listed methods, a variety of algorithms can be utilized as methods for extracting (or analyzing) the location information of a mobile terminal. 
     As the extracted location information of the mobile terminal  500  is transmitted to the mobile terminal  500  through the WiFi location measurement server, the mobile terminal  500  can obtain the location information. 
     As connected to at least one wireless AP, the mobile terminal  500  can obtain location information. At this point, the number of wireless APs, which are required for obtaining the location information of the mobile terminal  500 , can vary according to a wireless communication environment where the mobile terminal  500  is located. 
     Then, referring to  FIG. 6 , an example that a WFD session is established between a WFD source and a WFD sink and screen sharing service is provided is described.  FIG. 6  is a ladder diagram illustrating a process that a WFD session is established between a WFD source and a WFD sink and a screen sharing service is provided according to an embodiment of the present invention. 
     At least one of operations shown in  FIG. 6  can be supported by one or more Wi-Fi Direct standard documents. 
     A display service in WFDS can mean service and application for allowing screen sharing between P2P devices. P2P service using display service can be referred to as a WFD device; a device for supporting streaming of multimedia content through a device P2P link among WFD devices can be referred to as a WFD source; and a device for receiving multimedia content from a WFD source device through a P2P link and rendering it can be referred to as a WFD sink. 
     The WFD source  10  can be the mobile terminal  500  shown in  FIG. 5 . Accordingly, the WFD source  10  can include all the components of the mobile terminal  500  shown in  FIG. 5 . 
     The WFD sink  20  can be the display device  100  shown in  FIG. 1 . Accordingly, the WFD sink  20  can include all the components of the mobile terminal  500  shown in  FIG. 1 . 
     According to an embodiment, an image displayed on a screen can be an image of multimedia content. 
     According to another embodiment, if the WFD source  10  is the mobile terminal  500  shown in  FIG. 5 , an image displayed on the screen can be an image being displayed by the mobile terminal  500 , for example, the home screen of the mobile terminal  500  or the execution screen of an application installed on the mobile terminal  500  or a video of a media content. 
     Then, the WFD source  10  and the WFD sink  20  can first discover the presence of each other before a WFD connection setup through WFD device discovery (S 601 ). In more detail, WFD devices can recognize the presence of each other through a probe request frame including WFD information element (IE) and a probe reply frame. The WFD IE can include base information for establishing an optimized connection between WFD devices, for example, a device type and a device state. If a WFD device receives a probe request frame including a WFD IE, in response to this, the WFD device can transmit a probe reply frame including its WFD IE. If a WFD device is linked to an AP and operates as a Wi-Fi P2P device, more than two Wi-Fi transceivers operate logically in one physical device. At this pint, in order for WFD device discovery, a Wi-Fi Direct transceiver is used. A probe request frame for WFD device discovery can include a P2P IE in addition to a WFD IE and they can be decoded by a Wi-Fi Direct transceiver. 
     Then, the WFD source  10  and the WFD sink  20  can discover the service capability of each other before a WFD connection setup (S 603 ). In more detail, if one WFD device transmits a service discovery request frame where WFD capability is included as information sub element, in response to this, another WFD device can transmit a service discovery reply frame where its WFD capability is included as an information sub element. In relation to a service discovery procedure, a WFD device for supporting a service discovery procedure as a selective procedure can perform a service discovery procedure with a discovered WFD device for supporting a service discovery procedure. In order to perform a service discovery procedure, a probe request frame and reply frame used for a device discovery procedure can include information for indicating whether a WFD device has a capability for supporting a service discovery procedure. 
     Then, the WFD source  10  or the WFD sink  20  can select a peer WFD device for a WFD connection setup. A peer WFD device for processing a WFD connection setup can be selected by a user&#39;s input or a peer WFD device for processing a WFD connection setup can be automatically selected according to a policy. 
     Then, the WFD device can select a method for a WFD connection setup with the selected peer WFD device in operation S 605 . In more detail, a WFD device can establish a WFD connection through a Connectivity Scheme of one of Wi-Fi P2P and Tunneled Direct Link Setup (TDLS). The WFD devices can determine a Connectivity Scheme based on Preferred Connectivity information and a linked BSSID sub element delivered in addition to a WFD IE. 
     If a WFD setup is performed successfully by using Wi-Fi P2P or TDLS between WFD devices, a WFD device can process WFD capability negotiation in operation S 607 . In more detail, the WFD source  10  and the WFD sink  20  can exchange a message by using the Real-Time Streaming Protocol (RTSP) to determine a parameter set for defining an audio/video payload during a WFD session. The WFD source  10  and the WFD sink  20  can exchange their specification information. The WFD source  10  can inquire the capability of the WFD sink  20  by using the RTSP protocol and in response to this, the WFD sink  20  can transmit its capability information to the WFD source  10 . For example, the WFD sink  20  can transmit resolution information including its supportable resolutions to the WFD source  10 . For example, the WFD sink  20  can transmit resolution information that its supportable resolution includes a resolution corresponding to a 16:9 or 4:3 aspect ratio to the WFD source  10 . Herein, a resolution corresponding to 16:9 or 4:3 is just one example, and can be a resolution corresponding to an aspect ratio that a horizontal length is longer than a vertical length. 
     On the other hand, the WFD source  10  can also transmit resolution information including its supportable resolutions to the WFD sink  20 . 
       FIGS. 7A to 7D  are views illustrating resolution information that a WFD sink transmits to a WFD source according to an embodiment of the present invention. 
     The WFD sink  20  can transmit at least one of resolution tables shown in  FIGS. 7A to 7D  to the WFD source  10 . That is, the WFD sink  20  can transmit a resolution corresponding to a 16:9 or 4:3 aspect ratio and a resolution corresponding to an aspect ratio that a horizontal length is longer than a vertical length to the WFD source  10 . 
     The resolution table shown in  FIG. 7A  can be a table for representing a set of resolutions supported by a handheld device that a WFD device supports and a refresh rate corresponding to a resolution. 
     The resolution table shown in  FIG. 7B  can be a table for representing a set of Consumer Electronics Association (CEA) resolutions supported by a WFD device and a refresh rate corresponding to a resolution. 
     The resolution table shown in  FIG. 7C  can be a table for representing a set of Video Electronics Standards Association (VESA) resolutions supported by a WFD device and a refresh rate corresponding to a resolution. 
       FIG. 7D  is a view illustrating a message that a WFD source inquires the capability of a WFD sink and a WFD sink includes its capability information in correspondence thereto. 
     After performing a connection setup with the WFD sink  20 , the WFD source  10  can transmit a request message M 3  for inquiring the capability of the WFD sink  20  by using the RTSP protocol. Referring to  FIG. 7D , the WFD source  10  can transmit a request message including a wfd-video-formats parameter  730  to the WFD sink  20 . The wfd-video-formats parameter  730  can be a parameter that the WFD sink  20  inquires a supportable video resolution. In response to the request message received from the WFD source  10 , the WFD sink  20  can transmit a request message M 3  including the resolution information shown in  FIGS. 7A to 7D  to the WFD source  10 . The resolution information can include resolution tables shown in  FIGS. 7A to 7C . This can be checked through a value of the video format parameter  730  in the replay message. 
     Again,  FIG. 6  is described. 
     During a WFD capability negotiation process with the WFD sink  20 , the WFD source  10  can transmit a necessary request message to the WFD sink  20  by using the RTSP protocol. For example, the WFD source  10  can transmit, to the WFD sink  20  by using the RTSP protocol, a message including content that an image of a video content corresponding to a specific resolution is to be delivered based on resolution information received from the WFD sink  20 . In more detail, the WFD source  10  can transmit, to the WFD sink  20  by using the RTSP protocol, a message including content that an image of a video content corresponding to a specific resolution is to be delivered based on resolution information received from the WFD sink  20 . That is, the WFD source  10  can select one of a plurality of resolutions included in resolution information shown in  FIGS. 7A to 7D , and transmit a message for representing that an image of the selected resolution is to be transmitted to the WFD sink  20 . As described later, a resolution that the WFD source  10  selects can not correspond to the resolution of an image that the WFD source  10  displays currently. 
     The WFD sink  20  can transmit a reply message through the RTSP protocol on the basis of a request message received from the WFD source  10  in operation S 611 . 
     According to an embodiment of the present invention, a resolution that the WFD source  10  selects cannot be included in resolutions that the WFD source  10  supports. That is, a resolution that the WFD source  10  displays currently cannot be included in resolutions that the WFD sink  20  supports. Operation S 609  and operation S 611  can be included in operation S 607  for WFD capability negotiation. 
     If the WFD capability negotiation operation is terminated successfully, a WFD session (or a Mira multicast session) is established between the WFD source  10  and the WFD sink  20 , and audio and video contents can be streamed from the WFD source  10  to the WFD sink  20  in operation S 613 . 
     According to an embodiment, the WFD sink  20  may display the entire image of the streamed video contents. 
     In the following description, it is assumed that the WFD source  11  may be the mobile terminal  500  described with reference to  FIG. 5  and the WFD sink  20  may be the display device  100  described with reference to  FIG. 1 . 
     Accordingly, the WFD source  10  may include the entire components of the mobile terminal  500  shown in  FIG. 5 . Similarly, the WFD sink  20  may include all the components of the display device  100  shown in  FIG. 1 . 
     While the audio and video contents are streamed, the WFD sink  20  receives a zoom-in request signal for zooming in a partial image included in the entire image of the video content in operation S 615 . 
     According to an embodiment, the zoom-in request signal may be a signal for zooming in a partial image included in the entire image of the video content while being displayed on the display unit  180  of the WFD sink  20 . 
     That is, the zoom-in request signal may be a signal for zooming in a specific region around a certain point of the entire image of the video content. The certain point may be a point where a pointer movable by the remote control device is located. 
     According to an embodiment, the WFD sink  20  may receive the zoom-in request signal from the remote control device  200 . When a button provided in the remote control device  200  is selected, the remote control device  200  may transmit the zoom-in request signal to the WFD sink  20 . 
     The function of the WFD sink  20  for zooming in a partial image of the entire image may be referred to as a magic zoom function, but the magic zoom function is merely an example. 
     According to an embodiment, when a magic zoom function button provided in the remote control device  200  is selected, the display device  100  may receive the zoom-in request signal from the remote control device  200 . 
     The WFD sink  20  transmits a zoom-in mode request message to the WFD source  10  in response to the received zoom-in request signal in operation S 617 . 
     According to an embodiment, the zoom-in mode request message may be a message indicating that the WFD sink  20  is performing the magic zoom function. 
     The zoom-in mode request message may be a message that requests an additional transmission of a zoomed-in image of a partial image corresponding to a location of a pointer. Specifically, the zoom-in mode request message may be a message that requests a transmission of a zoomed-in image of a partial image corresponding to a point where the pointer is located at a time point when the zoom-in request signal is received from the remote control device  200 . 
     The zoom-in mode request message may be a message that requests an additional transmission of the zoomed-in image of the partial image corresponding to the location of the pointer when the WFD sink  20  performs the magic zoom function. 
     That is, the zoom-in mode request message may be a message that requests a transmission of the entire image of the video content and the zoomed-in image of the partial image corresponding to the location of the pointer within the entire image. 
     The zoom-in mode request message may include location information identifying the zoom-in region in the entire image. The location information of the zoom-in region may include coordinates of the pointer and coordinates of the zoom-in region around the pointer. The location information of the zoom-in region will be described below. 
     According to an embodiment, the WFD sink  20  may transmit the zoom-in mode request message to the WFD source  10  through a user input back channel (UIBC). 
     The zoom-in mode request message may include a flag indicating that the WFD sink  20  is performing the magic zoom function. 
     The WFD source  10  obtains the zoom-in region within the displayed entire image of the video content based on the location information corresponding to the zoom-in region included in the zoom-in mode request message received from the WFD sink  20  in operation S 619 . 
     According to an embodiment, the WFD source  10  may obtain the zoom-in region to be zoomed in within the entire image, based on one or more of the coordinates of the pointer included in the position information corresponding to the zoom-in region and the coordinates of the zoom-in region. 
     The WFD source  10  transmits, to the WFD sink  20 , data of the entire image of the video content and data of the zoomed-in partial image corresponding to the obtained zoom-in region in operations S 621  and S 622 . 
     That is, the WFD source  10  may transmit, to the WFD sink  20 , the data of the entire image of the video content and the data of the zoomed-in partial image corresponding to the obtained zoom-in region at the same time in operations S 621  and S 622 . 
     The WFD source  10  may transmit the data of the entire image of the video convent and the data of the zoomed-in partial image to the WFD sink  20  through different channels. 
     According to an embodiment, the WFD source  10  may transmit the data of the entire image of the video convent and the data of the zoomed-in partial image to the WFD sink  20  by using a Real-Time Streaming Protocol (RTSP) protocol. 
     The WFD sink  20  displays the entire image based on the received entire image data on a sub screen of the display unit and displays the zoomed-in partial image based on the data of the zoomed-in partial image on a main screen of the display unit in operation S 623 . 
     According to an embodiment, the main screen and the sub screen of the display unit may be changed according to a size. 
     For example, the size of the main screen of the display unit of the WFD sink  20  may be larger than the size of the sub screen thereof. 
     The WFD sink  20  may move the entire image of the video content to a location where a letter box is displayed. The WFD sink  20  may move the entire image of the video content to a location where a letter box is displayed. 
     Hereinafter, operations S 600  to S 623  will be described in detail. 
     Before describing operations S 600  to S 623 , an example of performing a magic zoom function during screen sharing between the WFD source  10  and the WFD sink  20  will be described. 
       FIGS. 8 to 11  are views illustrating a process of performing a magic zoom function during screen sharing between a WFD source and a WFD sink according to an embodiment of the present invention. 
     Hereinafter, it is assumed that the WFD source  10  is the mobile terminal  500  and the WFD sink  20  is the display device  100 . 
     Additionally, it is assumed that the mobile terminal  500  is in a portrait mode. The portrait mode may be a mode in which the mobile terminal  500  is disposed so that a vertical length is longer than a horizontal length. A mode opposite to the portrait mode is a landscape mode. 
     The portrait mode may be referred to as a vertical mode, and the landscape mode may be referred to as a horizontal mode. 
     Referring to  FIG. 8 , the mobile terminal  500  may transmit an entire image  810  of content being displayed on the display unit  551  to the display device through a smart mirroring function. 
     The display device  100  may display the entire image  810  of the content received from the mobile terminal  500  on the display unit  180 . The display device  100  may further display better boxes  820  and  830  on both sides of the entire image  810  while displaying the entire image  810 . 
     That is, the first letter box  820  may be displayed on a left side of the entire image  810 , and the second letter box  830  may be displayed on a right side of the entire image  810 . 
     Each of the letter boxes  820  and  830  may be an image inserted due to a mismatching between a screen ratio of the display device  100  and a screen ratio of the mobile terminal  500 . 
     Referring to  FIG. 9 , a pointer  900  moving according to the movement of the remote control device  200  may be displayed on the display unit  180  of the display device  100 . 
     The display device  100  may receive a zoom-in request signal from the remote control device  200 . The zoom-in request signal may be a request for zooming in a partial image within the entire image  819  with respect to the pointer  900 . 
     The display device  100  may change a shape of the pointer  900  in response to the zoom-in request signal. The changed pointer  900  may have a magnifier shape. 
     The display device  100  may zoom in a partial image  811  included in the entire image  810  with respect to the pointer  900  as shown in  FIG. 10 . 
     In this case, after a scaling process is performed on a partial image of an original image, a boundary of the zoomed-in partial image  811  may be blurredly displayed. The scaling process may be performed through a weighted sum of squares. 
     That is, the display device  100  may perform interpolation on original pixel data of a partial image before zoom-in and then generate surrounding pixel data. However, in this process, a boundary of the zoomed-in partial image may be blurred. 
     Referring to  FIG. 11 , a zoomed-in partial image  1130  generated by zooming in an original partial image  1110  according to a zoom-in request signal is illustrated. As such, as compared to the original partial image  1110 , a boundary of each circle constituting the zoom-in partial image  1130  is blurred, and thus, an image having clear image quality cannot be provided. 
     Consequently, a resolution of the zoomed-in partial image  1130  is lower than a resolution of the original partial image  1100 , resulting in a degradation of image quality. 
     In this regard, according to another embodiment of the present invention, in order to maintain a result of an original image even when a partial image is zoomed in, the WFD sink  20  may receive a zoomed-in partial image at the same time as reception of an entire image from the WFD source  10 . 
       FIGS. 12 to 14  are views illustrating a process of performing a magic zoom function during screen sharing between a WFD source and a WFD sink according to another embodiment of the present invention. 
     In particular,  FIGS. 12 and 14  are an embodiment in which the mobile terminal  500  is in a portrait mode (vertical mode). 
       FIG. 12  may be an embodiment that is performed after the embodiment of  FIG. 9 . 
     That is, in the state of  FIG. 9 , when the display device  100  receives a zoom-in request signal from the remote control device  200 , the display device  100  may transmit a zoom-in mode request message to the mobile terminal  500 . 
     The mobile terminal  500  may obtain a partial image corresponding to a region to be zoomed in within an entire image  810 , based on the zoom-in mode request message received from the display device  100 . 
     The mobile terminal  500  may obtain the partial image of the region to be zoomed in by using a coordinate value of a zoom-in region included in the zoom-in mode request message. The mobile terminal  500  may obtain data of a zoomed-in partial image of the obtained partial image and transmit the data to the display device  100 . The data of the zoomed-in partial image may be data of a state in which the resolution of the original image is maintained. 
     After that, the mobile terminal  500  may transmit the data of the zoomed-in partial image  1210  of the image corresponding to the zoom-in region to the display device  100  together with the data of the entire image  810 . 
     The display device  100  may display, on the display unit  180 , the entire image  810  based on the received data of the zoomed-in partial image  1210  and the zoomed-in partial image  1210  based on the data of the zoomed-in partial image  1210 . 
     Referring to  FIG. 12 , the display device  100  may move the entire image  810  to a region  1201  where the existing first letter box  820  is displayed. Simultaneously, the display device  100  may display the zoomed-in partial image  1210  on the other region  1203  of the display unit  180 . 
     An example in which the entire image  810  is moved left from the center has been described with reference to  FIG. 12 , but this is merely an example. The entire image  810  may be moved right from the center. 
     On the other hand, the zoom-in mode request message transmitted by the display device  100  may include location information of the zoom-in region  811  to be zoomed in the entire image  810 . The mobile terminal  500  may use the location information of the zoom-in region  811  later so as to transmit, to the display device  100 , the mage of the state in which the partial image corresponding to the zoom-in region is zoomed in. 
     The location information corresponding to the zoom-in region  811  will be described below with reference to  FIG. 13 . 
     Referring to  FIG. 13 , the zoom-in region  811  around the pointer  900  having the magnifier shape is illustrated. The zoom-in region  811  may have a rectangular shape, but this is merely an example. The zoom-in region  811  may have various shapes such as a circular shape or an oval shape. 
     In  FIG. 13 , it is assumed that the zoom-in region  811  has a rectangular shape. 
     The display device  100  may obtain coordinates O of the pointer  900  displayed on the entire image  810 . Additionally, it is possible to obtain coordinates of each vertex of the rectangular zoom-in region  811  around the coordinates O of the pointer  900 . 
     That is, the display device  100  may obtain location information including coordinates A(x+w, y+h) of the first vertex of the zoom-in region  811 , coordinates B(x−w, y+h) of the second vertex thereof, third coordinates C(x−w, y−h) of the third vertex thereof, and fourth coordinates D(x+w, y−h) of the fourth vertex thereof. 
     The display device  100  may transmit the obtained location information of the zoom-in region  811  to the mobile terminal  500 . 
     The mobile terminal  500  may convert the coordinates of each vertex included in the location information of the zoom-in region  811  according to a screen ratio thereof. The mobile terminal  500  may obtain a partial image corresponding to the zoom-in region  811  by using the converted coordinates of each vertex. 
     Then, the mobile terminal  500  may obtain data of the zoomed-in partial image having the same resolution as the original image based on the obtained data of the partial image. 
     Referring to  FIG. 14 , the mobile terminal  500  may transmit the entire image  810  and the zoomed-in partial image  1210  to the display device  100  according to the received zoom-in mode request message. 
     Since the mobile terminal  500  provides the entire image  810  and the zoomed-in partial image  1201  having no degradation in image quality, the display device  100  may display the original image and the zoomed-in partial image of the original image without performing the scaling process. 
     The user can view a clear image of a region that he or she wants to zoom in. 
     Additionally, the user can view a zoomed-in partial image instead of an unnecessary block region such as a letter box. 
     Additionally, the user can view desired information in a large size and clearly through a large screen of the WFD sink  20 , as compared to a relatively small WFD source  10 . 
       FIGS. 15 to 17  are views illustrating a process of performing a magic zoom function during screen sharing between a WFD source and a WFD sink according to further another embodiment of the present invention. 
     In particular,  FIGS. 15 and 17  illustrate an embodiment in which the mobile terminal  500  is in a landscape mode (horizontal mode). 
     The mobile terminal  500  displays an entire image  1510  of media content in a landscape mode. The display device  100  displays a pointer  900  and the entire image  1510  of the media content received from the mobile terminal  500 . 
     When the mobile terminal  500  is in a landscape mode, the display device  100  may not display a letter boxy, unlike in the case where the mobile terminal  500  is in a portrait mode. 
     In this case, the display device  100  may receive a zoom-in request signal from the remote control device  200 . 
     The display device  100  may obtain location information of a zoom-in region  1500  corresponding to a point where the pointer  900  is located. The display device  100  may transmit a zoom-in mode request message including the obtained location information of the zoom-in region  1500  to the mobile terminal  500 . 
     The mobile terminal  500  may obtain a partial image to be zoomed in from the entire image  1510 , based on the location information of the zoom-in region  1500  included in the received zoom-in mode request message. 
     The mobile terminal  500  may obtain data of a zoomed-in partial image corresponding to the partial image and transmit the obtained data to the display device  100  together with data of the entire image  1510 . 
     Referring to  FIG. 16 , the display device  100  may display the zoomed-in partial image  1600  corresponding to the zoom-in region  1500  on the main screen of the display unit  180  and display the existing displayed entire image  1510  on the sub screen of the display unit  180 . 
     The main screen may be an entire screen of the display unit  180 , and the sub screen may be a partial screen of the display unit  180 . That is, the entire image  1510  may be zoomed out. 
     On the other hand, when the pointer  900  is located on the entire image  1510  displayed on the sub screen, the display device  100  may display, on the main screen, a zoomed-in partial image  1700  corresponding to a region  1601  corresponding to a point where the pointer  900  is located. 
     In the state of  FIG. 16 , when the pointer  900  is located on a certain point of the entire image  1510  displayed on the sub screen, the display device  100  may display, on the main screen, a zoomed-in partial image  1700  corresponding to a region  1601  corresponding to a point where the pointer  900  is located, as shown in  FIG. 17 . 
     The display device  100  may transmit, to the mobile terminal  500 , location information of the region  1601  corresponding to the point where the pointer  900  is located and may receive, from the mobile terminal  500 , data of the zoomed-in partial image  1700  corresponding to the region  1601 . 
     Even when the mobile terminal  500  is in the landscape mode, the user can view a zoomed-in image of a desired region through the entire image  1510  displayed on the sub screen. 
       FIG. 18  is a block diagram illustrating a configuration of a wireless device according to an embodiment of the present invention. 
     The wireless device shown in  FIG. 18  may be one of the WFD source  10  and the WFD sink  20  described above. 
     Referring to  FIG. 18 , the wireless device  1  may include a communication unit  2 , a memory  3 , a display unit  4 , and a processor  9 . 
     The communication unit  2  may transmit and receive a wireless signal and may implement, for example, a physical layer based on an IEEE 802 system. The communication unit  2  may be referred to as a transceiver. 
     The processor  9  may control operations of the communication unit  2 , the memory  3 , and the display unit  4 . The processor  9  may be electrically connected to the communication unit  2  to implement a physical layer and/or a MAC layer based on the IEEE 802 system. Additionally, the processor  9  may be configured to perform encoding and decoding operations of audio and video for a WFD service. Additionally, modules that implement operations of wireless devices according to various embodiments of the present invention may be stored in the memory  3  and may be performed by the processor  9 . The memory  3  may be included in the processor  9  or may be installed outside the processor  9  and connected to the processor  9  by a known means. Although not shown, the wireless device  1  may further include a sound output unit configured to output a sound. 
     When the wireless device  1  is the WFD source  10 , the WFD source  10  may include the entire configuration of the mobile terminal  500  shown in  FIG. 5 . In this case, the communication unit  2  of the wireless device  1  may perform all the functions of the wireless communication unit  510 . In particular, the communication unit  2  may include all the functions of the short-range communication module  514  included in the wireless communication unit  510 . Additionally, the memory  3  of the wireless device  1  may correspond to the memory unit  570  of  FIG. 5 , and the display unit  4  may correspond to the display unit  551  of  FIG. 5 . Additionally, the processor  9  may perform all the functions of the control unit  580  of  FIG. 5 . 
     When the wireless device  1  is the WFD sink  20 , the WFD sink  20  may include the entire configuration of the display device  100  shown in  FIG. 1 . In this case, the communication unit  2  of the wireless device  1  may correspond to the wireless communication unit  173  of  FIG. 1 , the memory  3  of the wireless device  1  may correspond to the storage unit  140  of  FIG. 1 , the display unit  4  of the wireless device  1  may correspond to the display unit  180  of  FIG. 1 , and the processor  9  of the wireless device  1  may correspond to the control unit  170 . 
     According to further another embodiment of the present invention, the WFD sink  20  may or may not remove a black image from the entire image being received from the WFD source  10  through a setup of a black image removal mode. For example, the WFD sink  20  may display a menu setup screen for setting the black image removal mode and may set whether to remove the black image through the menu setup screen. 
     The embodiments of the present invention can be supported by standard documents disclosed in at least one of an IEEE 802 system, a 3GPP LTE and LTE-A (LTE-Advanced) system, a 3GPP2 system, and a Wi-Fi Alliance (WFA) system, which are wireless access systems. That is, the steps or parts, which are not explained to clearly reveal the technical idea of the present invention, in the embodiments of the present invention can be supported by the above documents. Moreover, all terminologies disclosed in this document can be supported by the standard documents. 
     According to an embodiment, the above-described method may also be embodied as processor-readable codes on a program-recordable medium. Examples of the processor-readable medium may include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device. 
     The above-described display device is not limited to the configuration and method of the above-described embodiments, and some or all of the embodiments may also be selectively combined and configured to provide various modifications.