KR20080105929A - Refrigerator - Google Patents

Abstract

The present invention relates to a refrigerator, and more particularly, to a refrigerator that checks a state of a display device that can be attached and detached and performs appropriate communication accordingly.

The refrigerator according to the present invention includes a refrigerator main body having a plurality of storage spaces for storing an object, a refrigerator door that opens and closes the storage space, and has a receiving groove of a digital multimedia broadcasting (DMB) display device at the front thereof, and is detached and mounted in the receiving groove. The DMB display device and a control unit for driving and controlling a cooling cycle of the storage space and confirming a state in which the DMB display device is detached and mounted in the receiving groove can be confirmed. .

Description

Refrigerator {REFRIGERATOR}

1 is a front view and a partially enlarged view of a refrigerator according to the present invention.

2 is a configuration diagram of the refrigerator of FIG. 1.

3 is a partial perspective view of the refrigerator and the display device when the refrigerator according to the present invention is separated.

Figure 4 is a flow chart of the operation of the refrigerator according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: main control unit 20: display unit

The present invention relates to a refrigerator, and more particularly, to a refrigerator that checks a state of a display device that can be attached and detached and performs appropriate communication accordingly.

In general, a refrigerator is a device that can keep food fresh for a certain period of time by lowering the freezing compartment or the refrigerating compartment while repeating a refrigeration cycle in which the refrigerant is compressed, condensed, expanded, or evaporated.

Such a refrigerator includes a compressor for compressing a refrigerant into a gas refrigerant having a high temperature and high pressure, a condenser for condensing the refrigerant passing through the compressor with a high temperature and high pressure liquid refrigerant, and an expansion valve for reducing the refrigerant passing through the condenser with a low temperature and low pressure liquid refrigerant. And a refrigerating cycle having an evaporator as a basic component that absorbs heat in the freezing compartment or the refrigerating compartment and keeps the temperature inside the freezing compartment or the refrigerating compartment at a low temperature while evaporating the refrigerant passing through the expansion valve to a low-temperature low-pressure gas refrigerant.

Recently, side-by-side refrigerators are not only to satisfy various needs of the user, but also to prevent cold air loss. An ice extractor capable of extracting cold water or ice is integrally formed on the freezer door side. The home bar is formed so that the stored beverage or water can be easily taken out even if the refrigerator door is not opened or closed.

The conventional refrigerator includes control devices including a main microcomputer (or main controller) mounted on an upper side of a main body and a sub microcomputer included in a display device fixedly mounted to a refrigerator door. The display device displays the service type of the dispenser (eg, ice, water, flake ice), the set temperature of the freezer compartment, and the set temperature of the refrigerating compartment in a state in which the display device is fixedly mounted in the receiving groove of the refrigerator door. It is provided.

Such a conventional refrigerator does not provide various functions (for example, a DMB function), and in particular, does not provide a display device that is detachable and mountable.

An object of the present invention is to provide a refrigerator having a display device detachable from and attached to a refrigerator main body and capable of displaying the state of the refrigerator at all times.

In addition, an object of the present invention is to provide a refrigerator capable of checking the detachment and mounting state of the display device.

In addition, an object of the present invention is to provide a refrigerator capable of quickly providing a state of the refrigerator to the user by selecting an appropriate communication method according to the detachment and mounting state of the display device.

Hereinafter, the present invention will be described in detail by taking a refrigerator as an example based on the embodiments of the present invention and the accompanying drawings.

1 is a front view and a partially enlarged view of a refrigerator according to the present invention, Figure 2 is a block diagram of the refrigerator of FIG.

As shown in FIG. 1, the refrigerator 1 according to the present invention is formed such that a freezer compartment and a refrigerating compartment are partitioned at both sides in a refrigerator body 2 having an open front side, and a freezer compartment door at each front side of the refrigerator body 2. 4a) and the refrigerating compartment door 4b are hinged to be opened and closed, and a dispenser 3 and a display device 20 are mounted on the front side of the refrigerating compartment door 4a.

Here, the refrigerator main body 2 is formed so that the freezer compartment and the refrigerating compartment are partitioned on both sides by a partition wall (not shown), and a cold air circulation fan (not shown) for blowing an evaporator (not shown) and cold air may be built into the inner wall thereof. In addition, a cold air supply hole (not shown) is formed to allow the cold air around the evaporator to be supplied to the freezing compartment and the refrigerating compartment for circulation.

One side upper and lower ends of the freezer compartment door 4a and the refrigerating compartment door 4b are hingedly connected to the refrigerator body 2 by the hinge covers 9a and 9b to be opened and closed.

In particular, a rectangular accommodating groove is formed in the outer front side of the refrigerating compartment door 4a, and the display apparatus 20 is positioned in the accommodating groove to be detachable and mounted.

Of course, the display device 20 not only displays a control menu for the refrigerator (selection and display of the service type of the dispenser, input and display of the set temperature of the freezer and the refrigerating compartment, etc.), but also the present temperature, the current date and time, and the weather. In addition to displaying information, it is also configured to display sound.

As shown in FIG. 2, the refrigerator 1 controls the refrigerator to generate and supply cold air to the freezer compartment and the refrigerating compartment, and controls the main refrigerator 10 to control the entire refrigerator 1, and a detachable refrigerator. The display device 20 performs a display of status and a control input by a user.

These main control devices 10 and the display device 20 are connected to data lines DL1 and DL2 and power lines PL1 and PL2 through a hinge including a hinge axis (not shown) of the refrigerating compartment door 4a. Each is connected for communication and power supply. Usually, the main control apparatus 10 is mounted on the upper side of the main body 2 with less space constraint on the main body 2.

First, the main controller 10 receives an external commercial power supply (generally 220V), decompresses the driving voltage of a predetermined magnitude, and supplies the driving voltage to the power supply unit 11 and the driving voltage from the power supply unit 11. A driving unit 12 for driving a cooling cycle by performing operation of a compressor, controlling a fan for circulating cold air in a freezer compartment and a refrigerating compartment, and first and second communication units performing wireless communication with the display apparatus 20 ( 13a and 13b, a sensing unit 14 which detects whether the display apparatus 20 receives the driving power from the power supply unit 11, a power line PL1 and a wired line for supplying the driving power to the display apparatus 20. The control unit 19 is configured to control the operation of the entire freezer compartment and the refrigerating compartment by controlling the connection part 15 to which the data line DL1 for communication is connected and the driving unit 12 to perform cooling. However, the driving voltage from the power supply unit 11 is also supplied to other necessary components of the main control device 10, and this supply method is only an obvious technique for those skilled in the art.

The power supply unit 11 included in the main control device 10 may reduce the external commercial power supply of 220V to, for example, 12V and supply the same to the display device 20 through the power line PL1. Supply the required magnitude of voltage to the required components.

The driving unit 12 is a component that performs the control of the compressor and the control of the fan motor to generate and circulate the cold air in the freezer compartment and the refrigerating compartment.

The first and second communication units 13a and 13b are components for performing communication according to a plurality of wireless communication methods between the main control apparatus 10 and the display apparatus 20. The first and second communication units 13a and 13b may be an RF communication device such as bluetooth, Zigbee, or the like, or a short range communication device such as IrDA. However, the main control apparatus 10 includes at least one of the first and second communication units 13a and 13b so that the display apparatus 20 and the main control apparatus may be removed even when the display apparatus 20 is detached. (10) communication is performed.

When the display unit 20 is mounted in the receiving groove, the sensing unit 14 is connected to the display unit 20 by the connection unit 15, and when the driving voltage of the power supply unit 11 is provided to the display apparatus 20. The sensor senses the supply and interruption of this drive voltage. When the driving voltage is supplied to the display apparatus 20 by the sensing of the sensing unit 14, the control unit 19 is configured to mount the display apparatus 20 in the receiving groove, that is, the refrigerator main body 2. To judge. In addition, when the driving voltage is not supplied to the display apparatus 20 by the sensing of the sensing unit 14, the controller 19 is the display apparatus 20 detached from the receiving groove, that is, from the refrigerator main body 2. It is determined that it is detached.

The connection part 15 is connected to the power line PL1 and the data line DL1 and is coupled to the connection part 28 of the display apparatus 20 to supply the driving voltage through the power line PL1 and to supply the data line DL1. The wired communication is made through a kind of male / male connector or port.

The power line PL1 supplies a driving voltage of the power supply unit 11 and should be understood to include a ground line. In addition, the data line DL1 is for wired communication and may be, for example, an RS-232 communication medium.

The controller 19 stores humidity, temperature, and the like in the freezer compartment and the refrigerating compartment which are in the freezer compartment and the refrigerating compartment, and stores the set temperatures and operating modes of the freezer compartment and the refrigerating compartment which are input and transmitted by the user from the display apparatus 20. The control unit 19 controls the drive unit 12 to circulate cold air in the freezer compartment and the refrigerating compartment, thereby performing the stored operation information.

The control unit 19 is a state in the freezer compartment and the refrigerator compartment (for example, the current temperature of the freezer compartment, the current temperature of the refrigerator compartment, the service type of the dispenser, etc.) and operation information (eg, the set temperature of the freezer compartment, the set temperature of the refrigerator compartment, the dispenser) And service forms) and the like, and may have a separate storage unit or be embedded therein.

The control unit 19 is capable of wired communication with the display apparatus 20 through the data line DL1 to transmit information data including the current state and / or operation information of the freezer compartment and the refrigerating compartment, or the freezer compartment door 2a or the like. Send information data and the like about being open. In addition, the controller 19 receives and stores information data including operation information (for example, set temperatures and service types of the freezer compartment and the refrigerator compartment) input by the user.

In addition, when the display apparatus 20 is mounted on the refrigerator main body 2, the controller 19 may control the display apparatus 20 through the display apparatus 20 and the data line DL1 or the first and second communication units 13a and 13b. Send refrigerator status information. In addition, the controller 19 receives a control command input by the user from the display apparatus 20 and performs control corresponding thereto.

As described above, the controller 19 sets a communication method between the display apparatus 20 and the main control apparatus 10 so that the communication according to it is performed.

Next, the display apparatus 20 receives the driving voltage from the power supply unit 11 through the power line PL2 and depressurizes the power supply to a plurality of power sources, and provides the power supply unit 21a and the charging unit 21b and the user. The input unit 22 for receiving an input of the LCD, the LCD 23 for displaying the state and / or operation information of the refrigerator by the light generated by the backlight 25, and the state and / or operation information of the refrigerator are displayed in the LCD ( A screen control unit 24 for converting the display signal to be displayed on the display 23 to control the LCD 23, a backlight 25 for generating light, a speaker unit 26a for emitting light, and / or sound and / or An audio unit 26 comprising a microphone 26b for acquiring voice, a DMB module 27 for receiving a digital multimedia broadcasting (DBM) signal and providing a digital signal to the controller 30, and a main control device 10. It is connected to the connecting portion 15 of the supply voltage of the drive and data transmission and reception The connection unit 28 to be performed, the first and second communication units 29a and 29b to perform wireless communication with the main controller 10, and the state and / or operation of the refrigerator received from the main controller 10 The control unit 30 displays information, transmits a control command input from the user to the main control device 10, and performs a food storage management mode and a DMB broadcasting mode by the user's selection. However, the driving voltage from the power supply 21 consisting of the power supply 21a and the charging unit 21b is also supplied to other necessary components of the display apparatus 20, and such a supply method is a person familiar with the technical field to which the present invention belongs. It's just an obvious technique.

In detail, the power supply unit 21a is supplied with a supply power of 12 V, for example, and supplied to the backlight 25 as it is, and used as a power supply having a plurality of sizes (for example, 5 V, 3.3 V, and 1.8 V). The pressure is supplied to the required components. The charging unit 21b has the display device 20 mounted on the refrigerator main body 2 to charge the driving voltage applied from the power supply unit 11 so that the display device 20 is detached from the refrigerator main body 2 and driven from the outside. When no voltage is supplied, the same power supply function as that of the power supply unit 21a is performed.

The input unit 22 is installed at the periphery of the LCD 23 and can be easily input by the user. The input unit 23 is a button type or a touch pad type, and the number and type of the buttons are set in relation to the user interface.

The input unit 22 includes temperature setting means 22a for setting the temperature of the freezer compartment and the refrigerating compartment, dispenser setting means 22b for setting the service type of the dispenser (ice ice, water, flake ice, etc.), and the LCD 23. Menu means 22c for activating and selecting a user interface (setting of a refrigerator, controlling a refrigerator, displaying a food storage management mode, displaying a screen of DMB screens, channels, etc.) and performing a food storage management mode. A food storage button 22d for displaying the food, a DMB button 22e for executing the DMB broadcasting mode, a previous screen button 22f for displaying the previous user interface of the currently displayed user interface, and other means for selection. 22g to 22j, and a menu / selection button 22k for checking and selecting information displayed on the LCD 23, and the like.

The LCD 23, the screen controller 24, and the backlight 25 display a user interface, a DMB broadcast, a screen related to food storage management, a state of a refrigerator, and / or control information. This user interface may be the background on which the avatar is displayed. In addition, the user interface may additionally display information regarding the refrigerator state simultaneously with or separately from the avatar (see FIG. 2). As shown in FIG. 2, the LCD 23 displays an avatar (bear figure) 33 and basic information 31 of a refrigerator as a basic screen, and displays weather information (or weather conditions on the day) and the current day ( 32).

The speaker 26a expresses a voice recognition guide and the like as a sound during the food storage management mode, and the microphone 26b is mounted on the front of the refrigerator 1 so as to easily obtain a user's voice. Alternatively, the sound is applied to the controller 30.

The DMB module 27 tunes a DMB signal of a channel desired by a user input through the input unit 22 under the control of the controller 30 among the DMB signals received through an antenna mounted on the display apparatus 20. And a baseband 27b which amplifies and converts the DMB signal transmitted from the tuner 27a into a baseband signal, converts it into a digital signal, demodulates it, and transmits the demodulated digital signal to the control unit 30. Is done. The baseband 27b also performs deinterleaving and error correction on the demodulated digital signal received from the tuner 27a.

The connection part 28 may be configured as a male / male connector or a port corresponding to the connection part 15 of the main control device 10. When the display device 20 is mounted to the refrigerator main body 2, the connection part is provided. Coupled with (15), electrical connection is made through coupling between power line PL1 and PL2 and coupling between data line DL1 and DL2.

The first and second communication units 29a and 29b are communication means corresponding to the first and second communication units 13a and 13b of the main control device 10, and implement at least one wireless communication scheme. Component.

The controller 30 basically communicates with the main control apparatus 10 to display the state and / or operation information of the refrigerator and transmits a control command of the refrigerator selected by the user to the main control apparatus 10. . The control unit 30 performs communication according to the communication method set by the main control device 10. That is, when the main control device 10 starts the wired communication by the data lines DL1 and DL2, the wired communication is performed accordingly, and the first and second communication units 29a and 29b perform the wired communication. Do not perform wireless communication. This is because it is desirable that the main control device 10 not only detects detachment and mounting of the display device 20 but also quickly recognizes the state of all devices at all times.

If there is no user input for the food storage button 22d or the DMB button 22e, the controller 30 causes the LCD 23 to display a basic screen including the refrigerator state. The display of the refrigerator state may be a mounting state in which the display device 20 is coupled to the refrigerator main body 20 and the connection part 15 and the connection part 28 are electrically connected, or the display device 20 is connected to the refrigerator main body 20. It also takes place in a detached state. In particular, since the controller 30 stores information regarding the refrigerator state in a detached state or a mounted state, the controller 30 may always display the refrigerator state.

In addition, the controller 30 stores DMB screen information for performing the DMB mode. When the user presses the DMB button 22e, the DMB screen information includes a user interface screen such as a DMB operation start screen, a channel selection screen, and a volume selection screen. In addition, the control unit 30 includes a decoding function for decoding a digital signal received from the DMB module 27 and transmitting a signal (DMB screen) that can be processed by the screen control unit 24.

In addition, the controller 30 performs a food storage management mode when the user operates the food storage button 22d. Accordingly, the control unit 30 stores the food storage management information for performing the food storage management mode for storing and managing information (or food, etc.) information stored in the freezer compartment and the refrigerator compartment. The food storage management information stores information for performing a food information storage mode, a food information search mode, a food information deletion mode, and a food information notification mode.

First, the food information storage mode is for storing food information (food name, storage period, number or quantity, etc.) input by the user, and displays a screen for storing food information and a list of foods the user wants to save. And a screen for allowing the user to select a date for storing the storage deadline of the food to be stored (for example, a calendar screen).

In the food information search mode, when the user wants to check the information on the food currently stored in the refrigerator 1, a screen displaying information (food list list, etc.) corresponding to the food name input by the user is displayed on the screen. And a screen for allowing a user to select a storage deadline for the food retrieved by the user.

The food information deletion mode is for deleting food information selected through a food information search mode, and the like, and includes a screen including a selection of a target to be deleted, a selection of deletion, a deletion cancellation, and the like.

Finally, the food information notification mode is a mode in which the control unit 30 reads pre-stored food information, and provides the user with information about foods having exceeded the pre-stored storage period. The food information notification mode includes a screen for displaying food items that have exceeded their storage period, a screen for deleting these food information, and a screen for selecting a new storage deadline for foods that have exceeded their storage period.

The above-mentioned food information storage mode, the food information search mode and the food information deletion mode are performed depending on the input from the user, and the food information notification mode is performed after the user or automatically selects the notification mode. It is a service which the control part 30 independently provides.

In addition, the control unit 30 has a built-in timer for calculating the current date and time, etc., it is possible to determine the extent of the storage period of the food.

The refrigerator 1 of the present invention may perform an input through the input unit 22 and a voice recognition input for recognizing a user's voice in order to perform the food storage management mode. Input by the input unit 22 is as described above.

For voice recognition input, the controller 30 includes a voice recognition module (or voice recognition algorithm). The voice recognition module receives a user's voice (or voice signal) from the microphone 26b under the control of the control unit 30, and recognizes the voice as information (for example, text, numbers, characters, etc.) corresponding to the voice. By means of identification. The speech recognition module may be configured in hardware, in software, or in firmware. The controller 30 may display the information identified by the voice recognition module as characters (including numbers, letters, etc.) on the LCD 23.

In addition, when the food storage button 22d is operated, the controller 30 may preferentially perform a voice recognition input function. At this time, the controller 30 notifies the user through the speaker 26a that the voice recognition function starts immediately. In addition, the controller 30 may not read the voice from the microphone 26b through the voice recognition module for a predetermined time after notifying the start of the voice recognition function.

3 is a partial perspective view of a refrigerator and a display device according to the present invention separated;

As shown in FIG. 3, the display apparatus 20 may be attached to or detached from the receiving groove 5 formed above the dispenser 3 of the freezer compartment door 4a. The display apparatus 20 includes a connecting portion 28 on one side of the main body of the display apparatus for electrical coupling with the connecting portion 15 of the main control apparatus 10 on one side. The connection part 15 of the main control device 10 is mounted at one side of the accommodation groove 5, and when the display device 20 is inserted into and mounted in the accommodation groove 5, the connection part 15 and the connection part 28 are provided. Is connected to allow data communication and power supply.

The first and second communication units 13a and 13b of the main control device 10 are equipped with an appropriate element in the receiving groove 5 for transmitting and receiving data according to a communication method, for example, when performing infrared communication. Should be. This degree of change is only a matter of course recognized by those skilled in the art to which the present invention pertains.

Figure 4 is a flow chart of the operation of the refrigerator according to the present invention.

In detail, in step S11, the sensing unit 14 is connected to the power line PL1 and senses a driving voltage applied through the power line PL1. The detector 14 applies the detection signal to the controller 19. For example, the sensing signal may be a HIGH voltage or a LOW voltage.

In operation S12, the controller 19 receives a detection signal applied from the detector 14 to determine whether the display apparatus 20 is in a mounted state or a detached state. If the detection signal corresponds to a state in which the driving voltage is applied, the display apparatus 20 is coupled to the main control apparatus 10, that is, the connecting portion 15 and the connecting portion 28 are electrically connected to each other. 19, it is determined that the display apparatus 20 is mounted, and the flow proceeds to step S13. If the detection signal corresponds to a state in which the driving voltage is cut off, the display apparatus 20 is separated from the main control apparatus 10, that is, the connecting portion 15 and the connecting portion 28 are separated from each other. ) Determines that the display apparatus 20 is detached and proceeds to step S15.

In step S13, the control unit 19 sets an appropriate communication scheme at the time of mounting. For example, wired communication using the data lines DL1 and DL2, or infrared communication or short-range RF communication using the first communication units 13a and 29a may be set.

In step S14, the controller 19 starts communication with the display apparatus 20 according to the established communication scheme. That is, the control unit 19 takes the initiative to start the communication according to the communication method set at the time of mounting, and performs the transmission of the refrigerator state and the reception of the control command according to the set communication method. In addition, the control unit 30 of the display apparatus 20 recognizes that the display apparatus 20 is mounted on the refrigerator main body 2 as the communication starts according to the communication method. In addition, the display apparatus 20 may display the mounting state of the display apparatus 20 on the LCD 23 according to a set communication scheme so that the user may confirm it.

In step S15, the control unit 19 sets an appropriate communication scheme at the time of detachment. For example, RF communication or medium and long distance communication using the second communication units 13b and 29b may be set.

In step S16, the controller 19 starts communication with the display apparatus 20 according to the established communication scheme. That is, the control unit 19 takes the initiative to start communication according to the communication method set at the time of detachment, and performs transmission and reception of control commands in the refrigerator state according to the established communication method. In addition, the controller 30 of the display apparatus 20 recognizes that the display apparatus 20 is separated from the refrigerator main body 2 as the communication starts according to the communication method. In addition, the display apparatus 20 may display the mounting state of the display apparatus 20 on the LCD 23 according to a set communication scheme so that the user may confirm it.

The controller 19 repeatedly performs the above-described steps (S11) to (S16), so that stable communication can be performed regardless of the detachment and mounting state of the display apparatus 20.

However, the scope of the present invention is not limited by the above embodiments and drawings.

In the following, various aspects of the claimable invention are described. The following description forms a part of the detailed description of the present invention and should be understood as a minimum description of the technical idea of the present invention or examples of the refrigerator according to the present invention which can be grasped from various points of view. It should not be understood as a boundary limiting the present invention.

The refrigerator according to claim 1 of the present application has a refrigerator body having a plurality of storage spaces for storing an object, a refrigerator door which opens and closes the storage space, and a receiving groove of a digital multimedia broadcasting (DMB) display device is formed on the front surface thereof. , DMB display device that can be attached and detached to the receiving groove, and the control unit to perform the driving and control of the cooling cycle for the storage space, and to check the state that the DMB display device is detached and mounted in the receiving groove, DMB display device Detachable state can be confirmed.

The refrigerator of claim 2 at the time of filing is provided with an electrical connection between the control unit and the DMB display device in the receiving groove, so that the electrical connection is made when mounting into the receiving groove.

The electrical connection unit according to claim 3 applies the driving power from the control unit to the DMB display device, and supplies stable power at the time of detachment.

It is preferable that the control unit of claim 4 determines the detached and mounted state of the DMB display device from the connection state of the electrical connection unit.

In the filing, the control unit of claim 5 preferably includes a detection unit for detecting whether the driving power is applied.

It is preferable that the control unit and the DMB display device according to claim 6 at the time of filing have a communication interface for data communication.

The control unit of claim 7 controls the communication interface to perform a communication method according to a detached and mounted state of the DMB display device, so that stable communication is made in response to the detachable attach state of the DMB display device. .

The control unit described in claim 8 of the present application displays the detached and mounted state of the DMB display apparatus on the DMB display apparatus, so that the user can clearly recognize the attaching state of the DMB display apparatus.

The present invention of such a configuration is provided with a display device that can be attached and detached from the refrigerator body, there is an effect that can always display the state of the refrigerator.

In addition, the present invention has the effect of allowing the user to check the detachment and mounting of the display device.

In addition, the present invention has the effect of providing a state of the refrigerator quickly to the user by selecting an appropriate communication method according to the detachment and mounting state of the display device.

Claims (8)

A refrigerator body having a plurality of storage spaces for storing an object; A refrigerator door that opens and closes the storage space and has a receiving groove of a digital multimedia broadcasting (DMB) display device on a front surface thereof; A DMB display device that can be attached to and detached from the receiving groove; And a control unit configured to perform driving and control of a cooling cycle for the storage space and to check a state in which the DMB display device is detached and mounted in the accommodation groove. The method of claim 1, The refrigerator comprises an electrical connection between the control unit and the DMB display device in the receiving groove. The method of claim 2, And the electrical connection unit applies driving power to the DMB display device from the control unit. The method of claim 2, The control unit, characterized in that for determining the detached and mounted state of the DMB display device from the connection state of the electrical connection. The method according to any one of claims 2 to 4, The control unit comprises a detection unit for detecting whether the driving power is applied. The method according to any one of claims 1 to 4, And a control unit and a DMB display device each having a communication interface for data communication. The method of claim 6, The control unit controls the communication interface to perform a communication method according to the detached and mounted state of the DMB display device. The method of claim 6, The control unit is a refrigerator, characterized in that to display the detached and mounted state of the DMB display device on the DMB display device.

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