KR100984326B1 - Display system and method for controlling a display system - Google Patents

Abstract

The present invention relates to a display system and a display system control method. According to the present invention, by transmitting and receiving a control signal using the I2C communication protocol, a user may input a control command on one side of the display system and control each component of the display system. Therefore, the user can conveniently control each device of the display system without any additional device at low cost.

The display system and the display system control method as described above may be applied to a display system in which various components are connected to each other, such as when displaying images on a plurality of display devices.

Multimedia, Display, DDC

Description

Display system and method for controlling a display system}

The present invention relates to a display system and a display system control method, and more particularly, to a display system and a display system control method for displaying a multimedia image.

With the development of digital technology, digital images of various formats are generated and stored, and the user can play and display the various digital images on the screen when desired through a multimedia playback device. For example, a multimedia player for playing the digital image may include a computer, an optical disc player, a set-top box, a home game machine, a digital player device, and the like.

The image data reproduced in the multimedia playback apparatus may be displayed on the screen through the display apparatus, and the user may watch the image displayed on the screen. Examples of the display device include various flat pannel display devices, CRTs, and the like.

The multimedia playback device and the display device may be integrally included in one device or may be separated. In addition, the multimedia playback apparatus and the display apparatus may be directly connected, or a plurality of multimedia playback apparatuses and a plurality of display apparatuses may be connected to each other through a distributor or the like, and image data may be selectively distributed. This may be implemented according to various needs of the display method.

However, when implemented in a variety of ways as described above can meet the user's needs, there is a problem that the user must control each device independently. That is, in the case of using a plurality of multimedia playback devices or display devices, since the user must individually control the operation by using the controller of each device, the user may experience inconvenience and difficulty in using the device. There was a problem.

The present invention is to solve the above problems, an object of the present invention is to provide a display system and a display system control method that allows a user to control the display system by inputting a control command on one side of the display system.

The display system according to the present invention is a multimedia playback device for reproducing multimedia data and transmitting a control signal including an external device control command to the external device using an I2C protocol, and transmitting the multimedia data to at least one or more display devices. A splitter configured to receive a control signal from the multimedia player and perform a control operation or to transmit the received control signal to an external device using an I2C protocol; and a display device to display image data received from the splitter on a screen. It includes.

In another aspect, a display system according to the present invention is a multimedia playback apparatus for reproducing multimedia data and transmitting a control signal including an external device control command to the external device using an I2C protocol, and multimedia from at least one multimedia playback apparatus. A switcher that receives and switches data, receives a control signal from the multimedia player, performs a control operation, or transmits the received control signal to an external device using an I2C protocol, and image data received from the switcher It includes a display device for displaying on the screen.

In another aspect, a multimedia player according to the present invention includes a user interface that receives a control command from a user, a decoder that decodes multimedia data to generate image data, transmits the decoded image data, and controls an external device. And a transmitter / receiver for transmitting a control signal including a control command to the external device using an I2C protocol, and a controller for controlling transmission of decoded video data and transmission of a control signal.

In another aspect, the distributor according to the present invention comprises: an input selector for receiving multimedia data from a multimedia player selected from among at least one multimedia player, and receiving a control signal transmitted from the selected multimedia player using an I2C protocol; The address information included in the slave area of the I2C protocol is compared with the stored address information, and if the address is the same, the control is performed to perform the control operation included in the control signal. If the address is different, the control signal is sent to the display device. A control unit for controlling to transmit, and an output unit for outputting the multimedia data selected by the input selection unit to at least one display device, and transmits a control signal transmitted to the display device using the I2C protocol.

In another aspect, the switcher according to the present invention includes an input selector for receiving multimedia data from a multimedia player selected from among at least one multimedia player, and receiving a control signal transmitted from the selected multimedia player using an I2C protocol. And compares the address information included in the slave area of the I2C protocol with the stored address information and controls to perform a control operation included in a control signal if the address is the same, and if the address is different, displays the control signal. And a control unit for controlling to transmit to the display device, and an output unit for outputting the multimedia data selected by the input selecting unit to the display device and transmitting a control signal transmitted to the display device using the I2C protocol.

In another aspect, a display system control method according to the present invention includes receiving a control command from a user, and transmitting a control signal including a command to control an external device among the received control commands to a first external device using an I2C protocol. Transmitting, and when the first external device receives the control signal, compares the address information included in the slave area of the I2C protocol with the address information of the first external device, and includes the control signal if the address is the same. Performing a controlled control operation.

According to the display system and the display system control method of the present invention, a user can input a control command from one side of the display system and control each component of the display system. Therefore, the user can conveniently control each device of the display system without any additional device at low cost.

The display system and the display system control method as described above may be applied to a display system in which various components are connected to each other, such as when displaying images on a plurality of display devices.

The objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings. In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the corresponding description of the invention, It is to be clear that the present invention is to be understood as the meaning of terms rather than names.

The operation of the display system and the display system control method according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

The Video Electronics Standard Association (VESA) has established Extended Display Identification Data (EDID), which contains information about display devices, and the Display Data Channel (DDC) protocol for data communication between multimedia playback devices and display devices. According to the DDC protocol, when a display device is connected to a multimedia player and power is applied to the display device, the display device provides an EDID to the multimedia player. The multimedia reproducing apparatus provides image data so that the display apparatus can display an image according to the EDID data received from the display apparatus.

DDC specification 2 performs a bidirectional communication between a multimedia playback device and a display device by using a high speed synchronous serial communication method called I2C (Inter Intergraged Circuit). By using the I2C communication protocol as described above, necessary data can be exchanged between the multimedia player and the display device. In the case of I2C, each device is divided into a master and a slave to exchange data. The master generates a start and a clock signal of data transmission and reception, and the slave performs data transmission and reception with the master according to the start signal and the clock of the master.

Hereinafter, a control method and a control device for controlling a display system using the above I2C will be described.

1 is a diagram schematically illustrating a multimedia display system using a splitter according to an embodiment of the present invention. The display system includes a first multimedia player 100, an Mth multimedia player 105, a distributor 110, a first display device 120, a second display device 122, and a third display device 124. And an Nth display device 126. The multimedia display system includes at least one multimedia player and at least one display device. In the case of a display system as shown in FIG. 1, the display system may be used when a multimedia player is shared. For example, it may be used to simultaneously display images such as advertisement images or TV images played in a multimedia player on a plurality of display apparatuses.

The multimedia player 100 and 105 reproduce and output various kinds of multimedia image data. The multimedia reproducing apparatuses 100 and 105 may reproduce and output digital multimedia image data in a form stored in an optical disc or a large capacity memory, or may receive and reproduce a TV signal or a VOD signal. Examples of the multimedia player include a computer, an optical disc player, a set top box, a home game machine, and a digital player device.

The distributor 110 receives a video signal output from the multimedia player and distributes or relays the image signal to the display device. At least one multimedia player and at least one display device may be connected to the distributor 110. The display apparatuses 120, 122, 124, and 126 display image data received from the distributor 110 on a screen.

An interface that connects the multimedia player 100, 105, the distributor 110, the display devices 120, 122, 124, 126, etc. may use an interface that supports DDC. For example, the interface may include a video graphics array (VGA) cable, a 25-pin RGB cable, a digital visual interface (DVI), a high definition multimedia interface (HDMI), and the like. Hereinafter, for convenience of description, it will be described on the assumption that HDMI is used among the interfaces.

In the display system as shown in FIG. 1, when the multimedia playback apparatuses 100 and 105, the distributor 110, and the display apparatuses 120, 122, 124, and 126 are controlled, the apparatuses may be independently controlled. However, in the case of independently controlling as described above, the user may have difficulty in controlling because a user must use a command input device for each device. Therefore, in order to reduce the difficulty as described above, the multimedia player can control the operations of the distributor and the display device as well as the multimedia player. As described above, the control signal may be transmitted / received using I2C to control the operation of the distributor, the display device, and the like on the multimedia reproducing apparatus. For example, the control signal input to the multimedia player can be transmitted to the distributor or the display device using I2C.

2 is a diagram schematically showing a multimedia player according to an embodiment of the present invention. The multimedia player 100 includes a storage 200, a controller 210, a decoder 220, a transceiver 240, and a controller 150. Meanwhile, the decoder 220 and the controller 210 may be implemented as one chip, that is, the decoding and control module 230, which can be fully understood by those skilled in the art.

The storage unit 200 stores multimedia data such as image data and the like to read and play the stored data. For example, the storage unit 200 may be configured to read data from an internal storage medium such as a hard disk (HDD) or a large memory, or an external storage medium such as an optical disk drive or a memory port. Etc. can be mentioned.

The decoding and control module 230 performs a decoding function of multimedia data and a control function of a reproduction device. For example, the decoder 220 may receive and decode digital image data from the storage 200. The decoder 220 may be implemented to decode digital image data of various formats, and the decoded image data is transmitted to the transceiver 240 under the control of the controller 210.

The controller 210 generates control data (or control signals) for controlling each module to control the operation of each module. The controller 210 may control a playback device by receiving a control signal received from the user interface 250. In addition, according to the present invention, to control the distributor 110 control signal or the display device (120, 122, 124, 126) control signal received from the user interface unit 250 to be transmitted to the distributor 110 side using I2C. Can be. Control signal transmission using the I2C will be described in detail later.

The transceiver 240 may receive the EDID of the display apparatus, convert the image data decoded by the decoder 220 into a predetermined signal, and transmit the converted image data to the display apparatus. In addition, the transceiver 240 may transmit the distributor 110 control signal or the display device 120, 122, 124, 126 control signal to the distributor 110 using I2C under the control of the controller 210. have.

The user interface 250 may receive various information or commands from the user to control the playback device. In addition, the control signal for the distributor 110 or the display device from the user may be received and transmitted using I2C. The user interface 250 may use various types of input devices. For example, various input devices may be used, such as a mouse, keyboard, input keys, touch pad, remote controller, and the like.

3 is a view schematically showing a dispenser as an embodiment according to the present invention. The distributor 110 includes a first input selector 300, a first controller 310, and a first output unit 320. The distributor 110 of FIG. 3 is an example of assuming a case where two multimedia player devices and eight display devices are connected to each other using HDMI for convenience of description.

The first input selector 300 selects one of the image data input from the two multimedia player (input 1, input 2) and transmits it to the first output unit 320. The image data may be selected by receiving a command from a user. Although not shown in FIG. 3, a user interface for receiving a command from a user may be included. The first output unit 320 may transmit the received image data to eight display devices. The first output unit 320 may simultaneously transmit the same image data to eight display apparatuses, or may transmit the image data to a display apparatus selected by a user.

The distributor 110 includes a DDC signal (DDC 1, DDC 2) for controlling the distributor 110 or the display apparatuses 120, 122, 124, and 126 according to the image data (videos 1 and 2) or I2C from the multimedia player. Can be received. For convenience of explanation, it is assumed that a DDC signal is received from the multimedia player 1 (input 1).

When the DDC signal is received, the first input selector 300 transmits the DDC signal to the first controller 310. The first controller 310 monitors the destination address of the DDC signal. As a result of the monitoring, when the DDC signal is a signal having the distributor 110 as a slave, the first controller 310 receives a DDC signal from the multimedia player 1 and performs control corresponding to the received signal. As a result of the monitoring, when the signal is not the slave 110 as a slave, the first controller 310 copies the DDC signal and transmits the DDC signal to each display device through the first output unit 320.

As described above, when the distributor 110 transmits the DDC signal to the display device, the distributor 110 serves as a master and the display device serves as a slave. Accordingly, the display device receiving the DDC signal monitors the destination address of the DDC signal, and receives and receives the DDC signal from the distributor 110 when the display device receives the DDC signal as a slave. The control corresponding to the signal is performed. If the display device is not a slave signal, the display device ignores the received DDC signal.

4 is a diagram schematically illustrating a display system including a switcher according to an embodiment of the present invention. The display system includes a first multimedia player 400, an Mth multimedia player 405, a switcher 410, and a display device 420. In the display system of FIG. 4, at least one multimedia player is connected to the switcher 410, and the display device 420 displays the multimedia data received from the switcher 410 on the screen.

In the case of FIG. 4, matters other than the switcher 410 such as the multimedia player 400, 405, and the display device 420 are the same as described in the example of FIG. 1, description thereof will be omitted. The switcher 410 selects and outputs one of a plurality of inputs. That is, the switcher 410 selects one of the image data input from the multimedia player 400, 405 and transmits it to the display device 420.

5 is a view schematically showing a switcher as an embodiment according to the present invention. The switcher 410 includes a second input selector 500, a second controller 510, and a second output unit 520. For convenience of description, the switcher 410 of FIG. 5 is an example of assuming a case where five multimedia player and one display device are connected using HDMI.

The second input selector 500 selects one of image data input from five multimedia playback devices (input 1, input 2, input 3, input 4, input 5) and transmits it to the second output unit 520. do. The image data may be selected by receiving a command from a user. Similarly, although not shown in FIG. 5, a user interface for receiving a command from a user may be included. The second output unit 520 may transmit the received image data to the display device.

The switcher 410 may include DDC signals DDC 1, DDC 2, DDC 3, which control the switcher 410 or the display device according to the image data (video 1, 2, 3, 4, 5) or I2C from the multimedia player. DDC 4 and DDC 5) may be received. When the DDC signal is received from one of the five multimedia playback devices, the second controller 510 monitors the destination address of the DDC signal, controls the switcher 410 corresponding to the received signal, or displays the display device. Replicate and transmit DDC signal. The monitoring and control or replication and transmission is as described in the example of FIG.

Hereinafter, a process of transmitting and receiving a control signal between a master and a slave according to the I2C communication protocol in the display system as described above will be described.

6 is a diagram schematically illustrating an I2C bus communication protocol as an embodiment according to the present invention. By using the I2C bus communication as described above it is possible to transmit and receive the control signal between the components of the display system.

In the following description, it is assumed that a control signal is transmitted from a master to a slave for convenience of description. For example, when transmitting a control signal from the multimedia player to the distributor, switcher, or display device, the multimedia player plays the role of a master, and the distributor, switcher, or display device plays the role of a slave. When the control signal is transmitted to the display device, as described above, the distributor and the switcher may serve as a master between the display device and the display device.

The master may transmit a START signal 600 indicating the start of data transmission between the master and the slave to the slave through the interface. The interface may be DVI, HDMI, or the like, which supports the DDC as described above. The master transmits address information 610 of the slave, which is a target of data transmission and reception, to the slave. When the slave receives the slave address information 601 as described above, the slave transmits an ACK 620 signal indicating normal reception to the master.

When the ACK signal 620 is received, the master transmits information (eg, a sub-address to which data to be transmitted later) 630 of the sub-address of the target slave to the slave. When the information 630 for the sub address is received, the target slave transmits an ACK signal 640 indicating the normal reception to the master. When the ACK signal 640 is received, the master transmits data 650 to be transmitted to the target slave to the target slave. When the target slave receives the data 650, the target slave transmits an ACK signal 660 indicating the normal reception thereof to the master. As described above, when all data is transmitted and the ACK signal 660 is received from the slave, the master transmits a STOP signal 670 indicating the end of data transmission to the slave. When the control signal is transmitted to the slave by the multimedia player, the control data may be included in the data 650 area of FIG. 6 and transmitted.

7 is a diagram schematically illustrating a distributor control data value as an embodiment according to the present invention. The control data may be transmitted to the slave according to the protocol of FIG. 6 using the data value as shown in FIG. 7. In the case of FIG. 7, the slave to which the data value is applied is the distributor 110. It is also assumed that the divider 110 has two inputs and eight outputs.

In the case of FIG. 7, the slave address value 0x80 and the sub address value 0x00, 0x01, 0x02, and 0x07 of the distributor are included. The data value received at sub address 0x00 is a value that turns on (0x01) or off (0x00) the power of the distributor, and the data value received at sub address 0x01 selects input 1 (0x00) or input 2 (0x01) of the distributor. Is the value. The data value received at sub-address 0x02 turns on or off the outputs of each of the eight distributors (0x10, 0x11, 0x20, 0x21,… 0x80, 0x81) and all outputs on (0xFF) or all outputs Off (0x00). ). The data value received at the sub address 0x07 is a value controlling whether the CEC (Consumer Electronics Control) function, which is one of the functions of the HDMI, is used in the distributor (0x00, 0x10, 0x11, 0xFF).

It is assumed that the splitter is to be powered on through an input device such as a remote controller or a key input of a multimedia player. When the user inputs the distributor power on command from the multimedia player, the multimedia player transmits the START signal 600 and the address value (0x80) 610 of the distributor as shown in FIG. 6 to the distributor. The distributor compares the received address value (0x80) with its own address value and transmits an ACK 620 signal indicating the normal reception of data to the master, that is, the multimedia player.

The multimedia player may transmit the sub address value 630 0x00 for the power on command of the distributor to the distributor, and the distributor transmits an ACK confirmation signal 640 to the multimedia player. When the ACK signal is received, the multimedia player transmits a control data value (0x01) 650 for turning on the power of the distributor to the distributor. When the ACK signal 660 confirming the normal reception of the data is received from the distributor, the multimedia playback apparatus finishes transmitting and receiving data (670).

7 is a form in which only some values are displayed without all values being described for convenience, and sub address values, data values, etc. may be further included according to an example of a control function. For example, a sub-address value and a data value may be allocated to include more function control such as pre-emphasis function control or equalizer function control in addition to the power or input / output control.

In a form similar to that of FIG. 7, the multimedia playback apparatus may be implemented by allocating control data values for controlling the display apparatus. That is, as shown in FIG. 7, the slave value of the display device, the sub address value according to the function control, and the function control data value may be allocated.

For example, it is assumed that a user turns on the power of one of the plurality of display devices connected to the distributor in the multimedia player. Further, it is assumed that the slave value of the display device to turn on the power is 0x90, the sub address value for the power on command is 0x00, and the control data value for turning on the display device is 0x01.

The multimedia player transmits the data transmission start signal and the slave value (0x90) of the display device to turn on the power to the distributor. The distributor compares its address value (0x80) with the slave value (0x90). The distributor transmits an ACK signal confirming the normal reception of the slave value to the multimedia player, and receives the sub address value 0x00 and the data value 0x01 by the operation described with reference to FIG. 6. However, because the slave values are different, the distributor ignores the operation of the received control signal.

When data transmission and reception is finished between the multimedia player and the distributor according to the transmission and reception end signal, the distributor uses a slave signal (0x90), a sub address value (0x00), and a data value (0x01) received from the multimedia player. To the display device. The distributor may transmit the control signal to all connected display devices. In this case, the distributor plays the role of a master, and the display device plays the role of a slave.

As described with reference to FIG. 6, a control device transmits and receives a control signal between the distributor and the display device using I 2 C, and the display device having the same slave value performs an operation according to the received data value.

According to an embodiment of the present disclosure, a control command may be received from a user through the input device of the dispenser and the display device connected to the dispenser may be controlled through the input device of the dispenser.

8 is a diagram schematically illustrating a control data value of a switcher according to an embodiment of the present invention. The control data may be transmitted to the slave according to the protocol of FIG. 6 using the data value as shown in FIG. 8. In the case of FIG. 8, the slave to which the data value is applied is the switcher 410. 8 illustrates an example in which five inputs are connected to the switcher.

In the case of FIG. 8, the switch includes a slave address value 0x81 and sub address values 0x00 and 0x01. The data value received at sub address 0x00 is the value that turns the switcher on (0x01) or off (0x00), and the data value received at sub address 0x01 is input 1 (0x01), input 2 (0x02), input of the distributor. This value selects 3 (0x03), input 4 (0x04), and input 5 (0x05). Operation according to the data value is as described with reference to FIG. 7.

In addition, FIG. 8 is a form in which only some values are displayed without all values being described for convenience, and sub address values, data values, etc. may be further included according to an example of a control function. In a form similar to that of FIG. 7, the multimedia playback apparatus may be implemented by allocating control data values for controlling the display apparatus.

As described above, in order to control the distributor, switcher, display device, etc. of the lower end of the multimedia player, the multimedia player, the distributor, the switcher, the display device, etc., must store data as shown in FIG. 7 or 8 in advance.

9 is a flowchart schematically illustrating a method for controlling a display system according to an embodiment of the present invention.

A control command for controlling the system is received from a user who uses the display system (S900). Assuming that the user wants to control the display system through the input device of the multimedia player in the display system as shown in FIG. 1, the user can access the multimedia player through an input device such as a key input or a remote controller of the multimedia player. The control command of the classifier and the display device can be input.

If the control command is not a control command for the multimedia player, the control signal including the control command is transmitted to the slave (S910). The control signal may be transmitted to the slave using the I2C communication protocol of the DDC. At this time, the multimedia player plays the role of a master, and the distributor plays a role of a slave.

Upon receiving the control signal, the slave determines whether the control target slave performs control according to the control signal (S920). In the case of transmitting / receiving a control signal using I2C, it may be determined whether the control target slave is by comparing the target slave address information with the address information of the slave receiving the control signal. As a result of the determination of S920, when the slave is a control target, the slave performs a control operation according to the received control signal (S930).

As a result of the determination in S920, when it is not the control target slave, the information of the received control signal is transmitted to the lower end (S940). Control signal transmission and reception with the lower end may use an I2C communication protocol. If there is no lower end, the slave takes no action and the received control signal can be deleted.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

1 is a diagram schematically illustrating a multimedia display system using a distributor according to an embodiment of the present invention.

2 is a view schematically showing a multimedia player according to an embodiment of the present invention.

3 is a view schematically showing a distributor according to one embodiment according to the present invention;

4 is a diagram schematically illustrating a display system including a switcher according to an embodiment of the present invention.

5 is a schematic view of a switcher as an embodiment according to the present invention;

6 is a diagram schematically illustrating an I2C bus communication protocol as an embodiment according to the present invention.

7 is a diagram schematically illustrating a distributor control data value as an embodiment according to the present invention.

8 is a diagram schematically illustrating a control data value of a switcher according to an embodiment of the present invention.

9 is a flowchart schematically illustrating a method for controlling a display system according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

100: first multimedia player 105: second multimedia player

110: distributor 120, 122, 124, 126: display device

Claims (16)

A multimedia player for reproducing multimedia data and transmitting a control signal including an external device control command to the external device using an I2C protocol; A distributor for transmitting multimedia data to at least one display device, receiving a control signal from the multimedia player, performing a control operation, or transmitting the received control signal to an external device using an I2C protocol; And A display device for displaying the image data received from the distributor on the screen, And the distributor compares the address information included in the slave area of the I2C protocol with the address information of the distributor and transmits the received control signal to the display apparatus using the I2C protocol when the address is different. The method of claim 1, And the control command is included in the data area of the I2C protocol and transmitted. The method of claim 1, The distributor, And comparing the address information included in the slave area of the I2C protocol with the address information of the distributor and performing the control operation included in the control signal when the address is the same. delete The method of claim 1, The display device, And comparing the address information included in the slave area of the I2C protocol with the address information of the display device, and performing the control operation included in the control signal when the address is the same. A multimedia player for reproducing multimedia data and transmitting a control signal including an external device control command to the external device using an I2C protocol; A switcher that receives and switches multimedia data from at least one multimedia player, receives a control signal from the multimedia player, performs a control operation, or transmits the received control signal to an external device using an I2C protocol; And A display device for displaying the image data received from the switcher on the screen, And the switcher compares the address information included in the slave area of the I2C protocol with the address information of the switcher and transmits the received control signal to the display device using the I2C protocol when the address is different. The method of claim 6, The switcher is, And comparing the address information included in the slave area of the I2C protocol with the address information of the switcher, and performing the control operation included in the control signal when the address is the same. delete delete delete delete An input selector configured to receive multimedia data from a multimedia player selected from among at least one multimedia player, and to receive a control signal transmitted from the selected multimedia player using an I2C protocol; The address information included in the slave area of the I2C protocol is compared with the stored address information, and if the address is the same, the control is performed to perform the control operation included in the control signal. If the address is different, the control signal is sent to the display device. A control unit controlling to transmit; And And an output unit configured to output the multimedia data selected by the input selection unit to at least one display device, and to transmit a control signal transmitted to the display device using an I2C protocol. 13. The method of claim 12, The control unit, And if the address is different, controlling to send the control signal to all display devices connected to the distributor. An input selector configured to receive multimedia data from a multimedia player selected from among at least one multimedia player, and to receive a control signal transmitted from the selected multimedia player using an I2C protocol; The address information included in the slave area of the I2C protocol is compared with the stored address information, and if the address is the same, control is performed to perform a control operation included in a control signal. If the address is different, the control signal is sent to a display device. A control unit controlling to transmit; And And an output unit configured to output the multimedia data selected by the input selection unit to a display device and to transmit a control signal transmitted to the display device using an I2C protocol. Receiving a control command from a user; Transmitting a control signal including a command to control an external device among the received control commands to a first external device using an I2C protocol; When the first external device receives the control signal, the address information included in the slave area of the I2C protocol is compared with the address information of the first external device. If the address is the same, the control operation included in the control signal is performed. Doing; And And if the address information is different, transmitting a control signal received by the first external device to a second external device using an I2C protocol. delete

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