KR100791464B1 - Display apparatus and method of controlling the same - Google Patents

Abstract

The present invention relates to a display apparatus and a control method thereof. The display device includes: a connection portion for generating an identification number according to a connection object; Read and write EDID storage having a write-protect port, and stores the EDID; The EDID is provided to the write-protect port according to the identification number through the connection unit, so that any error data transmitted from the computer body through the connection unit is not stored in the EDID storage unit. And a control unit for controlling the storage unit. As a result, error data can be prevented from being stored in the EDID storage unit.

Description

DISPLAY APPARATUS AND METHOD OF CONTROLLING THE SAME}

1 is an EDID storage unit and its peripheral configuration of a conventional display device;

2 is a control block diagram showing a state where a video card is connected in the display device according to the first embodiment of the present invention;

3 is a control block diagram illustrating a state in which an EDID storage jig is connected in a display apparatus according to a first embodiment of the present invention;

4 is a control block diagram of a display apparatus according to a second embodiment of the present invention;

5 is a control block diagram of a display apparatus according to a third embodiment of the present invention;

6 is a control block diagram of a display device according to a fourth embodiment of the present invention;

7 is a control block diagram of a display device according to a fifth embodiment of the present invention;

8 is a diagram illustrating a start condition (START condition) and an end condition (STOP Condition) of the SCL and SDA signals;

9 and 10 are control flow charts of the display device according to the first embodiment of the present invention;

11 is a control flowchart of a display device according to a second and a third embodiment of the present invention;

12 is a control flowchart of display devices according to fourth and fifth embodiments of the present invention.                 

* Explanation of symbols for the main parts of the drawings

10, 30, 40, 50, 70: EDID storage unit 11: Connection unit

12, 42, 52, 72: micom 18, 48: video card

28: EDID storage jig 32: current path

58, 78: selection unit 64, 84, 88: switching unit

The present invention relates to a display apparatus and a control method thereof, and more particularly, to a display apparatus and a control method thereof capable of preventing error data from being stored in an EDID storage unit.

In recent years, the 'PLUG AND PLAY' display device has been widely used.

While conventional display devices simply receive and display signals provided by the computer body, plug and play display devices are products that can exchange information with the computer main body. Just plug it in and the computer will automatically reconfigure your environment for optimal use.

In order to apply the plug and play function to the display device, an EDID (Extended Display Identification Data) consisting of a manufacturer ID, a product ID indicating the model name of the product, and whether or not the DPMS (Display Power Management Signaling) function is supported is applied to the display device. The protocol for archiving and transmitting it to the computer body should be preceded.

Accordingly, the Video Electronic Standards Association (VESA) has established a standard for the display data channel (DDC) transmission method for plug and play display devices.

Here, the DDC transmission method is defined as a communication channel between the computer main body and the display apparatus, and is a protocol for transmitting the display information stored in the display apparatus to the computer main body or changing the display information using a keyboard and a mouse. Say

The DDC transmission method is divided into DDC 1 and DDC 2B according to the transmission method.

The DDC 1 method transmits data from the display device to the computer body by 1 bit in accordance with the vertical synchronization signal V_sync transmitted from the computer body. As long as the vertical sync signal V_sync is input, the display device continuously outputs 128 bytes of EDID information.

In the DDC 2B method, when an EDID is requested from the computer main body to the display apparatus through SDA (Serial Address / Data) and SCL (Serial Clock) signal lines, the display apparatus transmits the stored EDID to the computer main body through the SDA signal line.

1 is a schematic diagram illustrating an EDID storage unit and a peripheral configuration thereof of a conventional display device.                         

As shown in FIG. 1, in the conventional display apparatus, the EDID storage unit 110 is supplied with at least one of the display apparatus power and the main body power. A write protect port (hereinafter referred to as a "WP port") is connected to ground.

Here, when the WP port is high, the EDID storage unit 110 may read only. If the WP port is low, the EDID storage unit 110 may read / write. ) It is possible.

However, in the conventional display device, the EDID storage unit 110 can be written as long as the main unit power is supplied regardless of the display device power, and the EDID is unexpectedly stored due to an electrostatic discharge (ESD) or a malfunction of an application when using a computer. There is a problem that the data of the unit 110 is written as abnormal data.

In addition, if the computer main body power is turned off while the EDID storage unit 110 accesses the EDID from the computer main body, communication is interrupted and the EDID storage unit 110 inputs a clock signal from the computer main body through the SCL signal line. You will not receive it and you will enter an abnormal state.

In addition, when the main body power is turned on while the EDID storage unit 110 receives the display device power, the power supplied to the EDID storage unit 110 may become unstable. In this state, accessing the EDID storage unit 110 may cause inaccurate results.

Accordingly, an object of the present invention is to provide a display apparatus and a control method thereof capable of preventing error data from being stored in an EDID storage unit.

Another object of the present invention is to provide a display apparatus and a control method thereof capable of preventing a malfunction of a DDC function.

According to the present invention, there is provided a display apparatus comprising: a connecting portion; A read and write EDID storage unit for storing the EDID; And a control unit controlling the EDID storage unit such that predetermined error data transmitted from the computer body through the connection unit is not stored in the EDID storage unit.

Wherein the connection unit selectively connects the video card of the computer body and the EDID storage jig, and generates an identification signal according to the connection target; The controller is configured to prevent the error data from being stored in the EDID storage unit when it is determined that the video card is connected according to the identification signal through the connection unit, and when it is determined that the EDID storage jig is connected. It is possible to control the EDID storage unit such that the EDID from the EDID storage jig is stored in the EDID storage unit.

The EDID storage section has a write-protect port; The control unit includes a microcomputer for providing an enable / disable signal to the write protection port according to the identification signal through the connection unit.                     

The controller may control the EDID storage unit to initialize the communication state of the EDID storage unit when it is determined that the video card is connected through the connection unit according to the identification signal.

The EDID storage section has an I2C line port; The controller determines whether the I2C line is accessible when the video card is connected, and if possible, provides a communication state initialization driving signal to the I2C line port.

Preferably, the communication state initialization driving signal includes a STOP condition signal in which data transmission is terminated.

In addition, the EDID storage unit has a power input port for receiving the display device power and the main body power; The controller may control the EDID storage unit such that the error data is not stored in the EDID storage unit when it is determined that the main body power is input through the power input port according to an input signal of the main body power source. .

The EDID storage section has a write-protect port; The control unit includes a current path connecting the main body power line to the write protection port.

The control unit may include a microcomputer that provides an enable / disable signal to the write protection port according to an input signal of the main body power.

The controller may control the EDID storage unit to initialize the communication state of the EDID storage unit when it is determined that the main body power is supplied according to an input signal of the main body power source.

The EDID storage section has an I2C line port; The controller determines whether the I2C line is accessible when the main body power is supplied, and if possible, provides a communication state initialization driving signal to the I2C line port.

Preferably, the communication state initialization driving signal includes a STOP condition signal in which data transmission is terminated.

In addition, the EDID storage unit has a power input port for receiving a display device power and the main body power, and a write-protection port which is enabled when the main body power is supplied through the power input port; Preferably, the control unit controls the EDID storage unit such that error data from the computer main body is not stored in the EDID storage unit when it is determined that the display device power is input according to the input device input signal. .

A switching unit for switching the write-protect port to switch an enable / disable state; The control unit includes a microcomputer for controlling the switching unit so that the write protection port is enabled when it is determined that the display device power is input according to the input device input signal.

And a selector for switching the write-protect port to a disabled state; The controller may control the switching unit such that the write-protect port is in a disabled state according to selection through the selection unit.

Meanwhile, according to another aspect of the present invention, there is provided a control method of a display apparatus having a connection portion and a read and write EDID storage portion for storing an EDID, the predetermined error data being transmitted from a computer body through the connection portion. Controlling the EDID storage unit so that is not stored in the EDID storage unit is also achieved by the control method of the display device.

The controlling of the EDID storage unit may include: generating different identification signals at the connection unit according to selective connection between the video card of the computer body and the EDID storage jig through the connection unit; When it is determined that the video card is connected according to the identification signal through the connection unit, the error data is not stored in the EDID storage unit. When it is determined that the EDID storage jig is connected, the EDID storage unit is used. It is possible to include controlling the EDID storage unit such that an EDID from a jig is stored in the EDID storage unit.

And if it is determined that the video card is connected through the connection unit according to the identification signal, controlling the EDID storage unit to initialize the communication state of the EDID storage unit.

The controlling of the EDID storage unit may include controlling the EDID storage unit such that the error data is not stored in the EDID storage unit when it is determined that the EDID storage unit receives the main body power according to an input signal of the main body power. It is possible to include a step.

And, if it is determined that the EDID storage unit receives the main body power according to the input power signal of the main body power, controlling the EDID storage unit to initialize the communication state of the EDID storage unit. .

The controlling of the EDID storage unit may include: writing the port to the write protection port when the EDID storage unit receives main body power; Controlling the EDID storage unit such that error data from the computer main body is not stored in the EDID storage unit when it is determined that the EDID storage unit receives the display device power according to an input signal of a display device power. It is possible to do

And receiving a disable state switch selection signal of the write-protect port; The method may further include controlling the write protection port to be in a disabled state according to the input selection signal.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention, the detailed description of the same configuration in each embodiment will be omitted.

2 and 3 are control block diagrams of a display apparatus according to a first embodiment of the present invention. As shown in these figures, the display device according to the first embodiment of the present invention includes a connection portion 11 for selectively connecting the video card 18 and the EDID storage jig 28, and an EDID for storing the EDID. A storage unit 10 and a microcomputer 12 for controlling them.

The connection part 11 may be a D-sub connector or a DVI connector to which the video card 18 and the EDID storage jig 28 are selectively connected.

As shown in FIG. 2, when the video card 18 is connected through the connection part 11, the ground point of the video card 18 and a part of the connection part 11 are connected to each other so that the ground voltage is connected through the connection part 11. Is output. On the other hand, as shown in FIG. 3, when the EDID storage jig 28 is connected through the connection portion 11, the connection portion 11 has a predetermined size by the resistance 26 in the EDID storage jig 28. Output voltage. That is, the connection unit 11 generates an identification signal corresponding to the object to be connected and provides it to the microcomputer 12.

EDID storage unit 10 is preferably an EEPROM (Electrically Erasable Programmable Read Only Memory) that stores the EDID. Here, the EDID is data having 128 bytes of information as shown in Table 1.

TABLE 1

Byte size division 8 bytes Header 10 bytes Manufacturer / Product Identification Code 2 bytes EDID Format Version 15 bytes Basic Display Parameters / Features 19 bytes Extended / Standard Timing 72 bytes Timing and Monitor Details 1 byte Extension flags 1 byte Checksum Sum 128 bytes

The EDID storage unit 10 includes a power input port (Vcc port) for receiving display device power and main body power, a write protect port (hereinafter referred to as a 'WP port'), a microcomputer 12, and a video. An I2C line port for communicating with the card 18 has a Serial Clock (SCL) port and a Serial Address / Data (SDA) port.

The power supply of the display device passing through the diode 14 or the main body power from the video card 18 passing through the diode 16 is input through the power input port. Here, the EDID storage unit 10 operates when at least one of the display apparatus power and the main body power is input.

In addition, the EDID storage unit 10 may read only when the WP port is high, and may read / write when the WP port is low.

The SCL port and the SDA port of the EDID storage unit 10 are connected with the video card 18 via the connection unit 11 to form an I2C communication interface with the video card 18. In addition, the SCL port and the SDA port are also connected to the microcomputer 12 so that the EDID storage unit 10 and the microcomputer 12 can communicate.

The microcomputer 12 determines whether the video card 18 is connected or the EDID storage jig 28 is connected in accordance with the identification signal output through the connection unit 11.

2, when it is determined that the video card 18 is connected, the microcomputer 12 provides a high signal as a WP enable signal to the WP port of the EDID storage unit 10. do.

Meanwhile, as shown in FIG. 3, when it is determined that the EDID storage jig 28 is connected, the microcomputer 12 is low as a WP disable signal to the WP port of the EDID storage unit 10. Provide a signal.

Thus, when the video card 18 is connected, the EDID storage unit 10 can be WP-enabled to prevent the error data from the computer main body from being stored in the EDID storage unit 10 in advance. In addition, when the EDID storage jig 28 is connected, the EDID storage 10 may be stored in the EDID storage 10 by disabling the EDID storage 10.

If it is determined that the video card 18 is connected, the microcomputer 12 determines whether the I2C line is accessible. As a result of the determination, when it is accessible, a STOP condition signal is provided to the SCL port and the SDA port to initialize the communication state of the EDID storage unit 10, respectively.

Here, the termination status signal will be briefly described as follows.

In general, the operating states of the SCL and SDA lines are divided into a communication ready state (BUSY), a start state (START), a data transmission state, and an end state (STOP).

The ready state is when both the SCL and SDA signals are high, and the start state is when SCL is high and SDA transitions from high to low. Also, the end state is when SCL is high and SDA transitions from low to high.

That is, the microcomputer 12 initializes the communication state by providing the SCL and SDA signals in the termination state to the SCL and SDA ports of the EDID storage unit 10 several times.

9 and 10 show a control flowchart of the display device according to the first embodiment of the present invention having such a configuration.

9 shows a control flow when the video card 18 is connected, and FIG. 10 shows a control flow when the EDID storage jig 28 is connected.

As shown in FIG. 9, the microcomputer 12 determines whether the video card 18 is connected according to the identification signal through the connection unit 11 (S10). If the microcomputer 12 determines that the video card 18 is connected through the connection unit 11, the microcomputer 12 provides a WP enable signal to the WP port of the EDID storage unit 10 so that any error data is stored in the EDID storage unit. The light is prevented from being written to (10) (S12). Then, the microcomputer 12 initializes the communication state of the EDID storage unit 10 (S14).

In addition, as shown in FIG. 10, the microcomputer 12 determines whether the EDID storage jig 28 is connected according to the identification signal via the connection unit 11 (S20). As a result of determination, when it is determined that the EDID storage jig 28 is connected, the WID disable signal is provided to the WP port of the EDID storage unit 10 so that the EDID provided from the EDID storage jig 28 is stored in the EDID storage unit ( 10) to be written to (S22).

4 is a control block diagram of a display apparatus according to a second embodiment of the present invention. As shown in the figure, the display device according to the second embodiment of the present invention, a power input port (Vcc port) for receiving the display device power and the main body power, a WP port, an unshown video card and I2C EDID storage unit 30 having an SCL (Serial Clock) port and SDA (Serial Address / Data) port for forming a communication interface, and a current path for controlling the EDID storage unit 30 according to the input signal of main body power. And (32).

The current path 32 interconnects the main body power line 38 and the WP port, and when the main body power is supplied through the power input port of the EDID storage unit 30, the main body power is supplied to the predetermined voltage level through the resistor 32b. To the WP port.

This is equivalent to applying a high signal to the WP port when the main body power is supplied through the power input port.

Thus, when the computer main body is turned on to use the computer main body, any error data that may occur in the computer main body may be prevented from being stored in the EDID storage unit 30 through the I2C communication interface.

5 is a control block diagram of a display apparatus according to a third embodiment of the present invention. As shown in the figure, the display device according to the third embodiment of the present invention, the power input port (Vcc port) for receiving the display device power and the main body power, the WP port, and I2C communication interface is formed EDID storage unit 40 having an SCL (Serial Clock) port and a SDA (Serial Address / Data) port, and a microcomputer 42 for controlling the EDID storage unit 40 according to an input signal of the main body power. do.

The microcomputer 42 checks that the main body power is being input through the power input port from the video card 48 connected through the connection unit (not shown) by an interrupt method or a polling method.

When the microcomputer 42 determines that the main body power from the video card 48 is being input to the EDID storage unit 40, the microcomputer 42 applies a high signal to the WP port, and the computer main body of the microcomputer 42 to the EDID storage unit 40. Prevent error data from being stored.

In addition, when it is determined that the main body power is input to the EDID storage unit 40, the microcomputer 42 determines whether the I2C line is accessible. As a result of the determination, the terminal state signal is provided to the SCL port and the SDA port to initialize the communication state of the EDID storage unit 40 if accessible.

The control flow of the display apparatus according to the second and third embodiments of the present invention is as shown in FIG.

First, the current path 32 of the second embodiment and the microcomputer 42 of the third embodiment detect whether main body power is supplied through the power input port (S30). As a result of the detection, when the main body power is supplied, the WP enable signal is provided to the WP ports of the EDID storage units 30 and 40 to prevent error data from the computer body from being stored in the EDID storage units 30 and 40. (S32). Then, the microcomputer 42 of the third embodiment initializes the communication state of the EDID storage unit 40 (S34).

Of course, the second embodiment may also provide a control unit for detecting whether the main body power is supplied to initialize the communication state of the EDID storage unit 30.

6 is a control block diagram of a display apparatus according to a fourth embodiment of the present invention. As shown in the figure, the display device according to the fourth embodiment of the present invention, a power input port (Vcc port) receiving the display device power and the main body power, a WP port, for forming an I2C communication interface EDID storage unit 50 having a serial clock (SCL) port and a serial address / data (SDA) port, a switching unit 64 for switching the WP port to enable / disable state, and a WP port And a microcomputer 52 for controlling the switching unit 64 in response to input of the display apparatus power and selection through the selection unit 58.

The WP port connected to the power input port is in the WP enabled state by applying a high signal when the main body power is supplied. However, thereafter, the power of the display apparatus is turned on, the microcomputer 52 is reset, and the power of the display device is pulled to change the state of the WP port to the disabled state.

Therefore, when the power of the display device is input, the microcomputer 52 turns off the switching unit 64 by applying a low signal to the switching unit 64 after completing the reset. Accordingly, the WP port is connected to the power input port and becomes high, thereby preventing the predetermined error data transmitted from the computer body from being stored in the EDID storage unit 50. Here, the illustrated switching section 64 represents an NPN transistor.

On the other hand, when it is determined that the switching state of the WP port is selected and input through the selector 58, the microcomputer 52 applies a high signal to the switch 64 to turn on the switch 64 to turn on the WP port. Connect to ground. Thus, it is possible to disable the WP port if necessary.

The selection unit 58 may be a hidden key combination or a command of an EDID storage jig (not shown) on the display device. As a result, it is desirable that the user cannot be easily selected by the user and can be used during the process or the service.

 7 is a control block diagram of a display apparatus according to a fifth embodiment of the present invention. As shown in this figure, in the present embodiment, the first switching unit 84 for switching the WP port to enable / disable state and the first switching unit 84 under the control of the microcomputer 72. The second switching unit 88 for applying a turn on / turn off control signal to the.

When the power of the display device is input, the microcomputer 72 turns on the second switching unit 88 by applying a high signal to the second switching unit 88 after completing the reset. As a result, a low signal is applied to the first switching unit 84 so that the first switching unit 84 is turned off. Accordingly, the WP port is connected to the power input port and becomes high, thereby preventing the predetermined error data transmitted from the computer main body from being stored in the EDID storage unit 70. Here, the illustrated first and second switching portions 84 and 88 represent NPN transistors.                     

On the other hand, when it is determined that the switching state of the disable port of the WP port is selectively input through the selector 78, the microcomputer 72 applies a low signal to the second switching unit 88 to operate the second switching unit 88. Turn off. Then, a high signal is applied to the first switching unit 84 so that the first switching unit 84 is turned on. As a result, the WP port is connected to ground, and it is possible to disable the WP port if necessary.

Control flow of the display apparatus according to the fourth and fifth embodiments of the present invention having such a configuration is as shown in FIG. First, assume that main body power is supplied.

Then, when the display apparatus is supplied with power and the microcomputers 52 and 72 are initialized (S40 and S42), the microcomputers 52 and 72 provide the WP enable signal to the WP ports of the EDID storage units 50 and 70. By controlling the switching units 64 and 88, the microcomputers 52 and 72 may be reset and the problem of changing to the WP disable may be solved (S44).

Meanwhile, in the above-described embodiments, the WP enable signal is a high signal and the WP disable signal is a low signal. However, when the WP port of the EDID storage unit is a low active port, the WP enable signal is The low signal and the WP disable signal may be a high signal.

As described above, the present invention can prevent the abnormal data from being written to the EDID storage unit by controlling the EDID storage unit such that predetermined error data transmitted from the computer body through the connection unit is not stored in the EDID storage unit.

The present invention is not limited to the above-described embodiment and can be modified by those skilled in the art within the spirit of the invention.

As described above, according to the present invention, there is provided a display apparatus and a control method thereof capable of preventing error data from being stored in an EDID storage unit.

Claims (22)

In the display device, A connection unit for generating an identification number according to a connection object; Read and write EDID storage having a write-protect port, and stores the EDID; The EDID is provided to the write-protect port according to the identification number through the connection unit, so that any error data transmitted from the computer body through the connection unit is not stored in the EDID storage unit. And a control unit for controlling the storage unit. The method of claim 1, The connection unit selectively connects the video card of the computer body and the EDID storage jig, The controller is configured to prevent the error data from being stored in the EDID storage unit when it is determined that the video card is connected according to the identification signal through the connection unit, and when it is determined that the EDID storage jig is connected. And controlling the EDID storage unit such that the EDID from the EDID storage jig is stored in the EDID storage unit. The method of claim 2, And the control unit includes a microcomputer for providing an enable / disable signal to the write protection port according to the identification signal through the connection unit. The method of claim 3, And the controller controls the EDID storage unit to initialize the communication state of the EDID storage unit when it is determined that the video card is connected through the connection unit according to the identification signal. The method of claim 4, wherein The EDID storage section has an I2C line port; The controller determines whether the I2C line is accessible when the video card is connected, and if possible, provides a communication state initialization driving signal to the I2C line port. The method of claim 5, And the communication state initialization driving signal comprises a STOP condition signal in which data transmission is terminated. The method of claim 1, The EDID storage unit has a power input port for receiving display device power and main body power; The controller controls the EDID storage unit such that the error data is not stored in the EDID storage unit when it is determined that the main body power is input through the power input port according to the input signal of the main body power source. Display device. The method of claim 7, wherein The EDID storage section has a write-protect port; The control unit includes a current path connecting the main body power line to the write-protect port. The method of claim 7, wherein The EDID storage section has a write-protect port; And the control unit includes a microcomputer for providing an enable / disable signal to the write protection port according to an input signal of the main body power. The method of claim 9, And the controller controls the EDID storage unit to initialize the communication state of the EDID storage unit when it is determined that the main body power is supplied according to an input signal of the main body power source. The method of claim 10, The EDID storage section has an I2C line port; The controller determines whether the I2C line can be accessed when the main body power is supplied, and if possible, provides a communication state initialization driving signal to the I2C line port. The method of claim 11, And the communication state initialization driving signal comprises a STOP condition signal in which data transmission is terminated. The method of claim 1, The EDID storage unit has a power input port for receiving a display device power and a main body power, and a write-protect port for enabling the main body power through the power input port; The control unit controls the EDID storage unit such that error data from the computer main body is not stored in the EDID storage unit when it is determined that the display device power is input according to the input device input signal. A display device. The method of claim 13, A switching unit for switching the write-protect port to switch an enable / disable state; And the control unit includes a microcomputer for controlling the switching unit so that the write-protect port is enabled when it is determined that the display device power is input according to the input device input signal. The method of claim 14, A selector for switching the write-protect port to a disabled state; And the control unit controls the switching unit so that the write-protect port is in a disabled state according to selection through the selection unit. A control method of a display apparatus having a connection portion and a read and write EDID storage portion for storing an EDID, Generating, by the connection unit, different identification signals according to connection targets; The EDID is configured to provide an enable signal or a disable signal to a write / disable port of the EDID storage unit according to the identification signal so that predetermined error data transmitted from the computer body through the connection unit is not stored in the EDID storage unit. And controlling the storage unit. The method of claim 16, Controlling the EDID storage unit, According to the selective connection of the video card of the computer body and the EDID storage jig through the connection unit, different connection signals are generated at the connection unit; When it is determined that the video card is connected according to the identification signal through the connection unit, the error data is not stored in the EDID storage unit. When it is determined that the EDID storage jig is connected, the EDID storage unit is used. And controlling the EDID storage unit such that an EDID from a jig is stored in the EDID storage unit. The method of claim 17, And controlling the EDID storage unit to initialize the communication state of the EDID storage unit when it is determined that the video card is connected through the connection unit according to the identification signal. The method of claim 16, Controlling the EDID storage unit, And controlling the EDID storage unit such that the error data is not stored in the EDID storage unit when it is determined that the EDID storage unit receives the main body power according to the input power signal of the main body power. Control method. The method of claim 19, And controlling the EDID storage unit to initialize the communication state of the EDID storage unit when it is determined that the EDID storage unit receives the main body power according to the input power signal of the main body power. Control method. The method of claim 16, Controlling the EDID storage unit, When the EDID storage unit receives the main body power, the write-protection port being enabled; Controlling the EDID storage unit such that error data from the computer main body is not stored in the EDID storage unit when it is determined that the EDID storage unit receives the display device power according to an input signal of a display device power. The control method of the display device, characterized in that. The method of claim 21, Receiving a disable state change selection signal of the write-protect port; And controlling the write protection port to be in a disabled state according to the input selection signal.

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