Patent Publication Number: US-2019199954-A1

Title: Display device and linkage service method

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0026953, filed on Mar. 2, 2017, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein its entirety. 
     BACKGROUND 
     1. Field 
     The disclosure relates to a display device for providing a digital broadcast according to selection of a user and a linkage service method. 
     2. Description of Related Art 
     Recently, introducing advanced television systems committee (ATSC) 3.0 into domestic ultra high definition (UHD) standard has been examined. The ATSC 3.0 standard may provide the highest image quality among UHD standard technologies and may be estimated to be favorable to interactive services. 
     Contrary to a digital broadcast which does not provide an option of a conventional real-time broadcast, ATSC 3.0 may provide an option for a real-time broadcast through a linkage service. For example, first drama content may be scheduled to broadcast in a time slot (hereinafter referred to as “second time slot”) subsequent to a soccer broadcast which is broadcast in a first time slot on a broadcast table of a broadcaster. If a soccer game goes longer than planned, a conventional digital broadcast server broadcasts the first drama content without no longer relaying the soccer broadcast when it is the second time slot from the first time slot. Since the conventional digital broadcast server transmits only the first drama content in the second time slot, a display device may fail to output the soccer broadcast although a viewer wants to more watch the extended soccer game. 
     However, since a broadcast server complying with the ATSC 3.0 standard broadcasts both of the first drama content and the soccer broadcast in the second time slot, a display device may output at least one of the first drama content and the soccer broadcast in the second time slot. However, ATSC 3.0 does not define a method of a linkage service of providing an option for a real-time broadcast in detail yet. 
     The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. 
     SUMMARY 
     Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a display device for providing a user&#39;s option for a real-time digital broadcast and a linkage service method. 
     In accordance with an aspect of the disclosure, a display device is provided. The display device may include a display, an input device configured to receive a user input, a first communication circuit configured to receive first content from a first network corresponding to a first channel selected according to the user input in a first time slot and receive second content associated with the first content over the first network or a second network corresponding to the first channel, and a processor configured to, when the second content is received, assign a virtual channel number to the second content. The first content is content scheduled to broadcast in a first time slot of the first channel in a broadcast table and is broadcast in the first time slot. The second content is content scheduled to broadcast in a second time slot before the first time slot in the broadcast table, but is extended and broadcast to at least a portion of the first time slot. The processor may be configured to include the virtual channel number and information of the second content in at least one of channel list information or electronic program guide (EPG) information displayed on the display. 
     In accordance with another aspect of the disclosure, a linkage service method by a display device is provided. The linkage service method may include receiving first content from a first network corresponding to a channel selected according to a user input in a first time slot, receiving second content associated with the first content over the first network and a second network corresponding to the selected channel in the first time slot, when the second content is received, assigning a virtual channel number to the second content, and including the virtual channel number and information of the second content in at least one of channel list information or EPG information to be displayed on a display of the display device. The first content is content scheduled to broadcast in a first time slot of the first channel in a broadcast table and is broadcast in the first time slot. The second content is content scheduled to broadcast in a second time slot before the first time slot in the broadcast table, but is extended and broadcast to at least a portion of the first time slot. 
     In accordance with another aspect of the disclosure, a display device is provided. The display device may include: a display; an input device configured to receive a user input; a first communication circuit configured to receive first content from a first network corresponding to a first channel selected according to the user input in a first time slot and receive second content associated with the first content over the first network or a second network corresponding to the first channel; and a processor configured to, when the second content is received, assign a virtual channel number to the second content. The first content may be content scheduled to broadcast in a first time slot of the first channel and may be broadcast in the first time slot. The second content may be content scheduled to broadcast in a second time slot before the first time slot and may be extended and broadcast to at least a portion of the first time slot. Further, the processor may be configured to include the virtual channel number and information of the second content in at least one of channel list information or electronic program guide (EPG) information displayed on the display. 
     In accordance with another aspect of the disclosure, a linkage service method by a display device is provided. The linkage service method may include: receiving first content from a first network corresponding to a channel selected according to a user input in a first time slot; receiving second content associated with the first content over the first network and a second network corresponding to the selected channel in the first time slot; when the second content is received, assigning a virtual channel number to the second content; and including the virtual channel number and information of the second content in at least one of channel list information or EPG information to be displayed on a display of the display device. The first content may be content scheduled to broadcast in the first time slot and may be broadcast in the first time slot. The second content may be content scheduled to broadcast in a second time slot before the first time slot and may be extended and broadcast to at least a portion of the first time slot. 
     According to the disclosure, the display device may provide a user&#39;s option for a real-time digital broadcast. 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram illustrating a configuration of a display device according to an embodiment; 
         FIG. 2  is a drawing illustrating a time when regular broadcast content and linkage content are broadcast, according to an embodiment; 
         FIG. 3  is a drawing illustrating a first user interface (UI) image for providing a notification that a linkage service is started, according to an embodiment; 
         FIG. 4  is a drawing illustrating a second UI image for providing a notification that a linkage service is finished, according to an embodiment; 
         FIG. 5  is a drawing illustrating a linkage service loading image according to an embodiment; 
         FIG. 6  is a drawing illustrating a UI image for providing a notification of a network connection error according to an embodiment; 
         FIG. 7  is a drawing illustrating a UI image for providing a notification of a broadcast server error according to an embodiment; 
         FIGS. 8 and 9  are drawings illustrating a channel information UI image including a key object for selecting linkage content according to an embodiment; 
         FIG. 10  is a drawing illustrating an electronic program guide (EPG) information image including a key object for selecting linkage content according to an embodiment; 
         FIG. 11  is a drawing illustrating a UI screen of a process of starting a linkage service according to an embodiment; 
         FIG. 12  is a drawing illustrating a UI screen of a process of finishing a linkage service according to an embodiment; 
         FIG. 13  is a drawing illustrating a UI screen of a process of selecting a linkage service using a virtual channel according to an embodiment; and 
         FIG. 14  is a drawing illustrating a UI screen of a process of selecting a linkage service using a channel of regular broadcast content according to an embodiment. 
         FIG. 15  illustrates a flowchart of a linkage service method according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, various embodiments of the disclosure may be described with reference to accompanying drawings. Accordingly, those of ordinary skill in the art will recognize that modification, equivalent, and/or alternative on the various embodiments described herein can be variously made without departing from the scope and spirit of the disclosure. With regard to description of drawings, similar elements may be marked by similar reference numerals. 
       FIG. 1  is a block diagram illustrating a configuration of a display device according to an embodiment.  FIG. 2  is a drawing illustrating a time when regular broadcast content and linkage content are broadcast, according to an embodiment.  FIG. 3  is a drawing illustrating a first user interface (UI) image for providing a notification that a linkage service is started, according to an embodiment.  FIG. 4  is a drawing illustrating a second UI image for providing a notification that a linkage service is finished, according to an embodiment.  FIG. 5  is a drawing illustrating a linkage service loading image according to an embodiment.  FIG. 6  is a drawing illustrating a UI image for providing a notification of a network connection error according to an embodiment.  FIG. 7  is a drawing illustrating a UI image for providing a notification of a broadcast server error according to an embodiment. 
     Referring to  FIG. 1 , a display device  10  according to an embodiment may include an input device  110 , a first communication circuit  120 , a second communication circuit  130 , a display  140 , a sound output device  150 , a memory  160 , and a processor  170 . In an embodiment, the display device  10  may fail to include at least one of the above-described elements or may further include another element. Alternatively, in an embodiment, some of the elements of the display device  10  may be combined with each other to form one entity, so that the functions of the elements may be performed in the same manner as before the combination. An input/output relationship shown in  FIG. 1  may be, but is not limited to, only an example for convenience of description. 
     The display device  10  may include at least one of, for example, a television (TV), a monitor, a notebook, a large format display (LFD), a smartphone, a tablet personal computer (PC), a mobile phone, a video phone, an electronic book (e-book) reader, a desktop PC, a laptop PC, a netbook computer, a personal digital assistant (PDA), a portable multimedia player (PMP), or a digital photo frame. 
     According to an embodiment, the input device  110  may receive a user input. For example, the input device  110  may include at least one of a touch sensor, a communication circuit, or an input button. 
     In an embodiment, the touch sensor may sense a touch of an operation means and may output touch coordinates of the operation means. For example, the touch sensor may include at least one of a touch pad (or a touch panel) or a touch controller. The touch pad may be a touch screen. In an embodiment, the communication circuit may communicate with a remote control device (e.g., a remote controller, a mouse, or the like). The communication circuit may communicate with the remote control device using various communication schemes, for example, Bluetooth, near field communication (NFC), infrared (IR) communication, a universal serial bus (USB), and a personal system 2 (PS2). The communication circuit may convert a control signal received from the remote control device into a control signal analyzable by the processor  170  and may convert a command signal received from the processor  170  into a command signal corresponding to a communication scheme with the remote control device to transmit the converted command signal. In an embodiment, the input button may be provided on the display device  10 . For example, the input button may include at least one of a power button, a channel change button, or a volume adjustment button. 
     In an embodiment, the input device  110  may be included in an external electronic device (e.g., a broadcast receiver) connected with the display device  10 . In this case, the display device  10  may receive content changed by a user input through the input device  110  or a signal (e.g., an image or audio) of the content. For convenience of description in the specification below, an embodiment is exemplified as the input device  110  is a communication circuit for receiving a signal from the remote control device. The remote control device may include an OK button, an upward button assigned to an upward movement function, a downward button assigned to a downward movement function, a leftward button assigned to a leftward movement function, a rightward button assigned to a rightward movement function, a return button, and the like. 
     According to an embodiment, the first communication circuit  120  may receive broadcast content transmitted from a broadcast server over a communication network (e.g., a broadcast network or an Internet network). The broadcast content may include real-time broadcast content and video on demand (VOD) broadcast content. The real-time broadcast content may include regular broadcast content and linkage broadcast content which is broadcast by a linkage service. 
     Referring to  FIG. 2 , the regular broadcast content (or first content) may be real-time broadcast content which is broadcast in a time slot (e.g., a first time slot D 1  or a second time slot D 2 ) scheduled in a broadcast table of each channel. The linkage content (or second content) may be real-time broadcast content which is broadcast outside of a time slot scheduled in a broadcast table. The linkage content may be, for example, content scheduled to broadcast in the first time slot D 1  in a broadcast table of a first channel, but may be extended and broadcast to at least a portion of the second time slot D 2  (e.g., a current time) by a linkage service since the broadcasting is not completed in the first time slot D 1 . 
     As shown in  FIG. 2 , first regular broadcast content C 1  may be scheduled to broadcast in the first time slot D 1  of a broadcast table, and second regular broadcast content C 2  may be scheduled to broadcast in the second time slot D 2  of the broadcast table. The broadcast server may broadcast the first regular broadcast content C 1  in the first time slot D 1  and may broadcast the second regular broadcast content C 2  in the second time slot D 2 , like the broadcast table. When the broadcasting of the first regular broadcast content C 1  is not finished in the first time slot D 1 , the broadcast server may provide the first regular broadcast content C 1  in the second time slot D 2  by the linkage service. For example, when the broadcasting of the first regular broadcast content C 1  is not finished in the first time slot D 1  may be when there is a situation where breaking news are broadcast while the first regular broadcast content C 1  is broadcast in the first time slot D 1 , when a live broadcast goes longer than planned in the case where the first regular broadcast content C 1  is broadcast live, or the like. 
     The broadcast server may transmit regular broadcast content and linkage content over the same communication network. The broadcast server may transmit both of the regular broadcast content and the linkage content over a broadcast network or an Internet network. For another example, the broadcast server may transmit one of the regular broadcast content or the linkage content over the broadcast network and may transmit the other of the regular broadcast content or the linkage content over the Internet network. 
     Return to  FIG. 1 , in an embodiment, the first communication circuit  120  may be configured in the form of simultaneously or selectively receiving regular broadcast content and linkage content from the broadcast server. For example, when both of the regular broadcast content and the linkage content are transmitted over the broadcast network, the first communication circuit  120  may include a dual tuner. For another example, when one of the regular broadcast content or the linkage content is received over the Internet network and when the other of the regular broadcast content or the linkage content is received over the broadcast network, the first communication circuit  120  may be configured in the form of supporting both of the broadcast network and the Internet network. 
     According to an embodiment, the second communication circuit  130  may communicate with an external electronic device. The external electronic device may be at least one of, for example, a monitor, a notebook, a digital photo frame, a smartphone, a tablet PC, a mobile phone, a video phone, an e-book reader, a desktop PC, a laptop PC, a netbook computer, a PDA, or a PMP. The external electronic device may be a device configured to communicate with the display device  10  through the second communication circuit  130 . 
     The display  140  may include, for example, a liquid crystal display (LCD), a light emitting diode (LED) display, an organic LED (OLED) display, or an electronic paper display. The display  140  may display, for example, a variety of content (e.g., a text, an image, a video, an icon, a symbol, and/or the like) to a user. 
     According to an embodiment, the sound output device  150  may output an audio of playback content. The sound output device  150  may include at least one of an amplifier or a speaker. The amplifier may amplify volume of content, and the speaker may output the amplified audio of the content. 
     The memory  160  may be a volatile memory (e.g., a random access memory (RAM) or the like), a nonvolatile memory (e.g., a read only memory (ROM), a flash memory, or the like), or a combination thereof. The memory  160  may store, for example, a command or data associated with at least one other element(s) of the display device  10 . 
     The processor  170  may include at least one of, for example, a central processing unit (CPU), a graphic processing device (GPU), a microprocessor, an application processor, an application specific integrated circuit (ASIC), or field programmable gate arrays (FPGA) and may have a plurality of cores. The processor  170  may perform an arithmetic operation or data processing associated with control and/or communication of at least one other element(s) of the display device  10 . 
     According to an embodiment, when a channel is selected by the input device  100 , the processor  170  may control the first communication circuit  120  to receive content (e.g., regular broadcast content) of the selected channel. For example, the processor  170  may adjust a receive frequency such that the first communication circuit  120  may receive broadcast content of the selected channel. When the content of the selected channel is received via the first communication circuit  120 , the processor  170  may output an image of the received image on the display  140  and may output an audio of the received content through the sound output device  150 . 
     According to an embodiment, when the content of the selected channel is regular broadcast content, the processor  170  may receive linkage service information while the regular broadcast content of the selected channel is output. The linkage service information may be, for example, information of providing a notification that first regular broadcast content scheduled to broadcast in a first time slot is extended and broadcast to at least a portion of a second time slot. The linkage service information may be received, for example, before the first time slot is finished. 
     According to an embodiment, when the linkage service information is received, the processor  170  may display a first UI image on the display  140 . For example, the processor  170  may output the first UI image immediately before the first time slot is finished (e.g., one minute before the first time slot is finished). Referring to  FIG. 3 , the first UI image may include a first key object  310  for selecting to watch regular broadcast content and a second key object  320  for selecting to watch linkage content. The first UI image may include a guide text  330  for providing a notification that a linkage service will be started. 
     According to an embodiment, when a first signal for selecting the first key object  310  is received from the input device  110 , the processor  170  may select linkage content as watching content. The first signal may be a signal received according to an operation of an OK button of a remote control device in a state where the first key object  310  is specified. In an embodiment, when a second signal for selecting the second key object  320  is received from the input device  110 , the processor  170  may select regular broadcast content as watching content. The second signal may be a signal received according to an operation of a return button of the remote control device. In an embodiment, the processor  170  may output content selected between the regular broadcast content and the linkage content in a second time slot capable of selecting the regular broadcast content and the linkage content. 
     According to an embodiment, when linkage content is selected as watching content while outputting regular broadcast content, the processor  170  may tune a channel to receive the linkage content or may transmit a request for content to the broadcast server. For example, the processor  170  may transmit a request for linkage content to the broadcast server over an Internet network and may wait until the linkage content is received over a broadcast network or the Internet network. For another example, when the linkage content is received over the broadcast network, the processor  170  may tune a channel of the first communication circuit  120 . In an embodiment, the processor  170  may provide a notification that linkage content is being prepared for being received on the display  140  while the linkage content is prepared for being received. 
     According to an embodiment, when at least one of information of linkage content or the linkage content is received, the processor  170  may assign a virtual channel number to the linkage content. The virtual channel number may be for at least one of selecting to watch the linkage content and outputting information of the linkage content. The virtual channel number may include at least one of a channel number of regular broadcast content associated with the linkage content or a virtual channel code. For example, when a channel number of regular broadcast content provided by a linkage service is “11-1” and when a virtual channel code is “A”, the processor  170  may assign the virtual channel number of the linkage content to “11-1A”. As such, according to an embodiment, the processor  170  may assign a virtual channel number for linkage content in a form where a user easily distinguish linkage content and easily determine regular broadcast content associated with the linkage content. 
     According to an embodiment, the processor  170  may include information of linkage content associated with a virtual channel number in at least one of channel list information or EPG information. For example, since the channel list information and the EPG information are sorted in an order of channel numbers, the processor  170  may include a virtual channel number and information of linkage content in a location according to an order of virtual channel numbers in a channel list of at least one of the channel list information or the EPG information. 
     According to an embodiment, when a virtual channel number of linkage content is selected in a channel up or down process through the input device  100  is selected or when a virtual channel number is selected by the input device  110 , the processor  170  may output the linkage content. As such, since a virtual channel number is assigned to the linkage content, although a channel is tuned while the linkage content is output, the processor  170  may enter a virtual channel corresponding to the linkage content again. For example, when a virtual channel number corresponding to linkage content is selected by channel up/down, channel designation, or the like, the processor  170  may output the linkage content. For another example, when at least one of a virtual channel number or information of linkage content is selected from channel list information and EPG information, the processor  170  may output the linkage content. 
     According to an embodiment, the processor  170  may output a UI image capable of distinguishing between linkage content and regular broadcast content. For example, the processor  170  may display a symbol specified for linkage content on at least one of a virtual channel number and information of the linkage content which are included in at least one of channel list information or EPG information. For another example, the processor  170  may display a symbol specified for linkage content on a channel information UI image (e.g., an info banner) of the linkage content. The specified symbol may include at least one of, for example, a specified text, a specified icon, or the like. 
     According to an embodiment, the processor  170  may output both of linkage content and regular broadcast content. For example, the processor  170  may output images of the linkage content and the regular broadcast content at the same size. The processor  170  may output an image of content selected by the input device  110  between linkage content and regular broadcast content on a left side of the display  140  and may output an image of the other image on a right side of the display  140 . For another example, the processor  170  may output images of linkage content and regular broadcast content at different sizes. The processor  170  may output an image of content selected by the input device  110  on the entire region of the display  140  and may output an image of the other content on a partial region of the display  140  (e.g., in a picture in picture (PIP) form). For another example, the processor  170  may display linkage content and regular broadcast content on different displays. The processor  170  may display an image of content selected by the input device  110  on the display  140  and may display the other content on a display of an external electronic device. When displaying linkage content and regular broadcast content on the same display, the processor  170  may output an audio of content selected between the linkage content and the regular broadcast content through the sound output device  150 . When able to simultaneously output an audio through a plurality of audio interfaces (e.g., a speaker, an earphone, a headphone, and the like) of the sound output device  150 , the processor  170  may output both of linkage content and regular broadcast content. For another example, when displaying linkage content and regular broadcast content on different displays, the processor  170  may output an audio through sound output devices corresponding to the different displays. 
     According to an embodiment, the processor  170  may verify that the broadcasting of linkage content is finished while the linkage content is output in a second time slot. When verifying that the broadcasting of the linkage content is finished, as shown in  FIG. 4 , the processor  170  may output a second UI image  400  for providing a notification that the broadcasting of the linkage content is finished. After outputting the second UI image  400 , the processor  170  may output regular broadcast content. 
     Referring again to  FIG. 1 , according to an embodiment, the processor  170  may expose a virtual channel number corresponding to linkage content in only a specified period (e.g., before the linkage content is finished). For example, the processor  170  may expose a virtual channel number in a process of tuning a channel during only a specified period. For another example, the processor  170  may include a virtual channel number in at least one of channel list information or EPG information during only a specified period. 
     According to an embodiment, the processor  170  may fail to assign a virtual channel number to linkage content. The processor  170  may fail to assign the virtual channel number to the linkage content and may include at least one key object for selecting to watch the linkage content in a fifth UI image. The fifth UI image may be at least one of channel information or EPG information of regular broadcast content. A description will be given of a corresponding embodiment with reference to  FIGS. 8 to 10 . 
     According to an embodiment, due to properties of an Internet network, a network delay or a network error may occur in the Internet network. As shown in  FIG. 5 , when a loading time is needed to receive linkage content, the processor  170  may output a third UI image  510  for providing a notification that it is during loading. When a loading time is needed to receive linkage content, the processor  170  may output a text for providing a notification that it is during loading. 
     As shown in  FIGS. 6 and 7 , the processor  170  may output a fourth UI images  610  or  710  for providing a notification of a network error for linkage content. For example, the fourth UI image  610  or  710  may include at least one of an error number (or an error code), a network error number, details of a network error (e.g., no network connection, a server error, or the like), or notification for a method of being out of a channel of linkage content. For another example, the fourth UI image  610  or  710  may include information of linkage content (e.g., a logo, a channel name, and the like of a virtual channel number). For another example, the fourth UI image  610  may include a third key object  620  for entering a trouble shooting guide menu for solving a network error. 
       FIGS. 8 to 10  are drawings illustrating a UI screen corresponding to linkage content according to an embodiment. 
       FIGS. 8 and 9  are drawings illustrating a channel information UI image including a key object for selecting linkage content according to an embodiment. 
     Referring to  FIG. 8 , a channel information UI image of regular broadcast content may include an up key object  810  associated with an upward button of a remote control device, a down key object  820  associated with a downward button of the remote control device, a left key object  830  associated with a leftward button of the remote control device, and a right key object  840  associated with a rightward button, other than information (e.g., Bing Bang Theory Season 7) of content. In this case, when a signal for selecting the up key object  810  is received from an input device  110  of  FIG. 1 , a processor  170  of  FIG. 1  may up-convert a receive channel of a first communication channel  120  of  FIG. 1 . When a signal for selecting the down key object  820  is received from the input device  110 , the processor  170  may down-convert the receive channel of the first communication circuit  120 . When a signal for selecting the left key object  830  is received from the input device  110 , the processor  170  may output information of just previous regular broadcast content. When a signal for selecting the right key object  840  is received from the input device  110 , the processor  170  may output information of future regular broadcast content. 
     In an embodiment, when just previous regular broadcast content of a selected channel is being broadcast to a current time by a linkage service, the processor  170  may display an icon  850  indicating that the just previous regular broadcast content is during the linkage service on a channel information UI image. In this case, after a signal for selecting the left key object  830  is received, when a signal for selecting the icon  850  (e.g., a signal corresponding to an OK button of the remote control device) is received, the processor  170  may output the linkage content which is during the linkage service. 
     Referring to  FIG. 9 , when linkage content is selected, the processor  170  according to an embodiment may output a sixth UI image  900  including information of the linkage content. For example, the sixth UI image  900  may include content information  930  of the linkage content, synopsis information  910  of the linkage information, and a key object  920  for selecting to watch the linkage content. The processor  170  may display regular broadcast content on a region of a display  140  of  FIG. 1 , where the sixth UI image  900  is not displayed. In an embodiment, when the key object  920  is selected, the processor  170  may output the linkage content. 
       FIG. 10  is a drawing illustrating an EPG information image including a key object for selecting linkage content according to an embodiment. 
     Referring to  FIG. 10 , a processor  170  of  FIG. 1  according to an embodiment may include at least one key object for selecting linkage content in an EPG information image. For example, when a signal for selecting information  1010  of content of a channel which is during a linkage service (e.g., a signal received according to a long press of an OK button of the input device  110 ) is received from an input device  110  of  FIG. 1 , the processor  170  may output a plurality of key objects  1020  and  1030  as a sublist of the information  1010  of the content. The plurality of key objects  1020  and  1030  may include at least one of the first key object  1020  for selecting linkage content and the second key object  1030  for selecting to display detailed information of the linkage content. When a third signal for selecting the first key object  1020  is received from the input device  110 , the processor  170  may output linkage content. The third signal may be, for example, a signal corresponding to an OK button of the remote control device, received in a state where the first key object  1020  is specified by an upward button, a downward button, and the like of the remote control device. When a fourth signal for selecting the second key object  1030  is received from the input device  110 , the processor  170  may output the detailed information of the linkage content. The fourth signal may be, for example, a signal corresponding to an OK button, received in a state where the second key object  1030  is specified by the upward button, the downward button, and the like of the remote control device. 
       FIG. 11  is a drawing illustrating a UI screen of a process of starting a linkage service according to an embodiment. 
     Referring to  FIG. 11 , on screen  1110 , a processor  170  of  FIG. 1  may display regular broadcast content of a channel (e.g., channel 101) selected by an input device  110  of  FIG. 1  on a display  140  of  FIG. 1 . 
     When linkage service information is received, on screen  1120 , the processor  170  may provide a first UI image including a key object for selecting regular broadcast content or linkage content which is being watched. On screen  1120 , the first UI image may include a “switch channel” object for selecting regular broadcast content and a “cancel” object for selecting linkage content. The first UI image may include a guide text for providing a notification that regular broadcast content which is being watched is expired and providing a notification that it is possible to watch the regular broadcast content which is being watched by a linkage service. 
     When a fifth signal for selecting the “switch channel” object is received from the input device  110  while screen  1020  is displayed, on screen  1130 , the processor  170  may prepare to receive linkage content. The fifth signal may be a signal received according to an operation of an OK button of a remote control device, received subsequent to a signal corresponding to a leftward button of the remote control device from the input device  110 . On screen  1130 , the processor  170  may provide a notification of being preparing to receive linkage content. On the other hand, when a sixth signal for selecting the “cancel” object is received from the input device  110 , on screen  1110 , the processor  170  may output regular broadcast content of the channel (e.g., channel 101) selected on screen  1110 . The sixth signal may be, for example, a signal received according to an operation of a return button of the remote control device. 
     When preparation for outputting the linkage content is completed, on screen  1140 , the processor  170  may output linkage content (e.g., a linkage service program). 
       FIG. 12  is a drawing illustrating a UI screen of a process of finishing a linkage service according to an embodiment. 
     Referring to  FIG. 12 , on screen  1210 , a processor  170  of  FIG. 1  may verify that a linkage service is finished while linkage content is output. For example, the processor  170  may receive linkage service information for providing a notification that the broadcasting of the linkage content is finished from a broadcast server. 
     When verifying that the broadcasting of the linkage content is finished, on screen  1220 , the processor  170  may output a UI image for providing a notification that the broadcasting of the linkage content is finished. 
     After outputting the UI image for providing the notification that the broadcasting of the linkage content is finished, on screen  1230 , the processor  170  may output regular broadcast content of a channel (e.g., a previous channel) associated with the linkage content. As such, in an embodiment, when the broadcasting of the linkage content is finished, the processor  170  may output regular broadcast content associated with the linkage content although a signal for selecting another channel is not received from an input device  110  of  FIG. 1 . 
       FIG. 13  is a drawing illustrating a UI screen of a process of selecting a linkage service using a virtual channel according to an embodiment.  FIG. 13  is an example in which a virtual channel for linkage content is generated. 
     Referring to  FIG. 13 , on screen  1310 , a processor  170  of  FIG. 1  may output regular broadcast content of a channel (e.g., channel 11-1) selected by an input device  110  of  FIG. 1 . 
     When a virtual channel (e.g., channel 11-1A) of linkage content is selected by tuning a channel (e.g., channel up) while outputting the regular broadcast content, on screen  1320 , the processor  170  may output the linkage content. 
     When a channel is out of the virtual channel (e.g., channel 11-1A) corresponding to the linkage content while outputting the linkage content, on screen  1330 , the processor  170  may output regular broadcast content of the selected channel (e.g., channel 11-1). When a linkage service is finished while outputting the linkage content, since a channel is tuned to the selected channel (e.g., channel 11-1), the processor  170  may output regular broadcast content. According to the above-mentioned embodiment, the processor  170  may expose linkage content in a process of tuning a channel as a virtual channel number for linkage content is assigned and may access the linkage content as a virtual channel is selected. In an embodiment, the convenience of watching linkage content may be provided. 
       FIG. 14  is a drawing illustrating a UI screen of a process of selecting a linkage service using a channel of regular broadcast content according to an embodiment.  FIG. 14  is an example in which a virtual channel for linkage content is not generated. 
     Referring to  FIG. 14 , on screen  1410 , a processor  170  of  FIG. 1  may receive and output first regular broadcast content “Sherlock Season 3” which is broadcast over a channel selected in a first time slot. In an embodiment, since the broadcasting of the first regular broadcast content is not completed in the first time slot specified for the first regular broadcast content before the first time slot is finished, the processor  170  may receive linkage service information for providing a notification that the first regular broadcast content will be broadcast by a linkage service. 
     On screen  1420 , the processor  170  may receive and output second regular broadcast content “Big Bang Theory Season 7” which is broadcast over a channel selected in a second time slot subsequent to the first time slot. In an embodiment, the processor  170  may include and output a key object for selecting linkage content on information of the second regular broadcast content. 
     When a signal for selecting the key object for selecting the linkage content is received, on screen  1430 , the processor  170  may output at least one of information of the linkage content or the linkage content. For example, after a signal corresponding to a leftward button of a remote control device is received from an input device  110  of  FIG. 1 , when a signal corresponding to an OK button of the remote control device is received, the processor  170  may output information (e.g., Sherlock Season 3) of the linkage content. The processor  170  may output current regular broadcast content “Big Bang Theory Season 7” together with the information of the linkage content. 
     When a signal for selecting a “continue watch” key object is received, on screen  1440 , the processor  170  may output linkage content “Sherlock Season 3”. The processor  170  may display an icon (e.g.,  ) indicating that linkage content is being broadcast on a channel information UI image. 
       FIG. 15  illustrates a flowchart of a linkage service method according to an embodiment. 
     Referring to  FIG. 15 , in operation  1510 , the processor  170  receives first content from a first network corresponding to a channel selected according to a user input in a first time slot. The first content may be content scheduled to broadcast in the first time slot and be broadcast in the first time slot. 
     In operation  1520 , the processor  170  receives second content associated with the first content over the first network and a second network corresponding to the selected channel in the first time slot. The second content may be content scheduled to broadcast in a second time slot before the first time slot and be extended and broadcast to at least a portion of the first time slot. 
     In operation  1530 , when the second content is received, the processor  170  assigns a virtual channel number to the second content. 
     In operation  1540 , the processor  170  includes the virtual channel number and information of the second content in at least one of channel list information or EPG information to be displayed on a display of the display device. 
     According to an embodiment, a display device includes a display (see the number  140  of  FIG. 1 ); an input device (see the number  110  of  FIG. 1 ) configured to receive a user input; a first communication circuit (see the number  120  of  FIG. 1 ) configured to receive first content from a first network corresponding to a first channel selected according to the user input in a first time slot and receive second content associated with the first content over the first network or a second network corresponding to the first channel; and a processor (see the number  170  of  FIG. 1 ) configured to, when the second content is received, assign a virtual channel number to the second content, wherein the first content is content scheduled to broadcast in a first time slot of the first channel and is broadcast in the first time slot, wherein the second content is content scheduled to broadcast in a second time slot before the first time slot and is extended and broadcast to at least a portion of the first time slot. The processor is further configured to include the virtual channel number and information of the second content in at least one of channel list information or electronic program guide (EPG) information displayed on the display. 
     Wherein the processor is further configured to display a user interface (UI) image, including a first key object for selecting the second content depending on the user input before the first time slot is expired and a second key object for selecting the first content, on the display; when a signal for selecting the first key object by the input device is received, output the second content in the second time slot; and when a signal for selecting the second key object by the input device is received, display the first content in the second time slot. 
     The processor is further configured to display the second content on the display upon selection of the virtual channel number. 
     The processor is further configured to when the virtual channel number is selected from the channel list information and the EPG information, display the second content on the display. 
     The processor is further configured to include a symbol capable of distinguishing the second content in at least one of an info banner of the second content, the virtual channel number, or the information of the second content. 
     The processor is further configured to when one of the first content or the second content is selected by the input device, display the selected content on the display. 
     The processor is further configured to display the selected content on an entire region of the display; and display the other content which is not selected between the first content and the second content (unselected content) on a partial region of the display. 
     The processor is further configured to display the selected content on a left region or a right region of the display; and display the other content which is not selected between the first content and the second content on a region where the selected content is not displayed. 
     According to an embodiment, the display device further includes a second communication circuit (see the number  130  of  FIG. 1 ) configured to communicate with an external electronic device, wherein the processor is further configured to when one of the first content or the second content is selected according to the user input, display the selected content on the display; and display the other content which is not selected between the first content and the second content on a display of the external electronic device. 
     The processor is further configured to when broadcasting of the second content is finished while the second content is output on the display, output the first content on the display. 
     According to an embodiment, a linkage service method by a display device, the method includes receiving first content from a first network corresponding to a channel selected according to a user input in a first time slot; receiving second content associated with the first content over the first network and a second network corresponding to the selected channel in the first time slot; when the second content is received, assigning a virtual channel number to the second content; and including the virtual channel number and information of the second content in at least one of channel list information or EPG information to be displayed on a display of the display device. Wherein the first content is content scheduled to broadcast in the first time slot and is broadcast in the first time slot, and wherein the second content is content scheduled to broadcast in a second time slot before the first time slot and is extended and broadcast to at least a portion of the first time slot. 
     The method further includes receiving linkage service information for providing a notification that the second content which is being broadcast in the first time slot is provided by a linkage service; displaying a UI image, including a first key object for selecting the second content depending on the user input before the first time slot is expired and a second key object for selecting the first content, on the display; when a signal for selecting the first key object is received, outputting the second content in the second time slot; and when a signal for selecting the second key object is received, displaying the first content in the second time slot. 
     The method further includes verifying whether the virtual channel number is selected according to the user input or whether the virtual channel number is specified and selected; and when the virtual channel number is selected, displaying the second content on the display. 
     The method further includes when the virtual channel number is selected from the channel list information and the EPG information, displaying the second content on the display. 
     The method further includes including a symbol capable of distinguishing the second content in at least one of an info banner of the second content, the virtual channel number, or the information of the second content. 
     The method further includes when the second content is received, outputting the first content and the second content. 
     The outputting includes displaying content, selected according to the user input between the first content and the second content, on an entire region of the display; and displaying the other content which is not selected between the first content and the second content on a partial region of the display. 
     The outputting includes displaying content, selected according to the user input between the first content and the second content, on a left region or a right region of the display; and displaying the other content which is not selected between the first content and the second content on a region where the selected content is not displayed. 
     The outputting includes displaying content, selected according to the user input between the first content and the second content, on the display; and displaying the other content which is not selected between the first content and the second content on a display of an external electronic device. 
     The method further includes while the second content is output, verifying whether broadcasting of the second content is finished; and when the broadcasting of the second content is finished, outputting the first content. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.