KR20080054594A - Control method of hdmi apparatus - Google Patents

Abstract

A control method for an HDMI(High Definition Multimedia Interface) device is provided to drive an HDMI only when the HDMI device performs an HDMI function by using a hot plug port and prevent noise. An HDMI input unit checks whether to perform an HDMI function(204). When the HDMI function is performed, the HDMI input unit outputs an HDMI driving control signal(206). The first and the second switching units are turned on according to the outputted HDMI driving control signal(208). The first and the second switching units supply power and provide a crystal oscillation signal(210). A reset signal providing unit provides a reset signal according to the HDMI driving control signal(212). An HDMI control unit drives the HDMI function according to the power and the crystal oscillation signal and performs initialization according to the reset signal(214). The HDMI control unit outputs a control signal for performing the HDMI function.

Description

CONTROL METHOD OF HDMI APPARATUS}

1 is a block diagram of an HDMI device suitable for performing an HDMI function according to an embodiment of the present invention;

2 is a flowchart illustrating a process of performing an HDMI function according to an embodiment of the present invention.

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

102: HDMI input unit 104: first switching unit

106: HDMI control unit 108: Reset signal providing unit

110: second switching unit

The present invention relates to a method of controlling a high definition multimedia interface (HDMI) device, and more particularly, to a method of controlling a high definition multimedia interface (HDMI) device. It relates to a control method.

As is well known, DVD (DVD) has recently been released as a recording medium for recording and playing back images with high quality, and digital TVs (TV) having high resolution have been developed.

As a result, more and more consumers use digital TVs with various DVD devices for recording or playing video on a DVD. As a digital interface for transmitting data between a DVD device and a digital TV, HMI (High Definition Multimedia Interface) and the like have been standardized.

A device for transmitting video data and audio data to an image reproducing device such as a digital TV using such HD is called an HDMI device, and the HDMI device is not only a variety of DVD devices. It also includes set-top boxes, VTRs, and game consoles.

Meanwhile, the conventional HMI device encodes the video data and the audio data output from the MPEG2 decoder and transmits the video data to the video reproducing device by using the HMI link. Even when there is no link, the digital video data and the audio data are output from the MPEG-2 decoder to the transmitter to increase the EMI (Electro-Magnetic Interference) due to noise. In particular, there is a problem that EMI is further increased due to noise generation due to crystal oscillation for driving the HMD function.

Accordingly, the present invention is to solve the above-described problems of the prior art, only when HHD to perform the HDMI function by using the hot plug port (HDMI) device HDMI (HDMI) It is an object of the present invention to provide a control method of an HDM device which can be driven to prevent noise.

In order to achieve the above object, the present invention provides a method for controlling an HDM device that performs an HMI function, the method comprising: checking whether the HMD function is performed, and the HDM Outputting an HMI driving control signal, switching on according to the output HHD driving control signal, and switching on the power Supplying and providing a crystal oscillation signal, providing a reset signal according to the HMD driving control signal, and driving the HHD function according to the power and crystal oscillation signal. Initializing according to a reset signal; and outputting a control signal for performing the HDMI function after the initialization. It provides the control of H. de-child device comprising the steps:

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Summary of the Invention The technical gist of the present invention checks whether the HMI function is performed and outputs the HMI drive control signal when the HMD function is performed. Switch on according to (HDMI) drive control signal, supply power through switching on, provide crystal oscillation signal, provide reset signal according to HDMI drive control signal, power and crystal oscillation signal According to the present invention, after driving the HDMI function according to the reset signal and initializing the reset signal, and outputting a control signal for performing the HDMI function after the initialization. Can easily be achieved.

1 is a block diagram of an HDMI device suitable for performing an HDMI function according to an embodiment of the present invention, the HDMI input unit 102, the first switching unit 104, HDMI The control unit 106 includes a reset signal providing unit 108 and a second switching unit 110.

Referring to FIG. 1, the HDMI input unit 102 receives an HDMI signal that performs an HDMI function. The HDMI input unit 102 receives an HDMI signal using a hot plug port. It can detect the performance of the function, and outputs the HMD drive control signal according to the HMD signal. For example, the HDMI input unit 102 switches off the first switching unit 104 and the second switching unit 110 when the HDMI signal is not detected to supply the power Vcc and the crystal oscillation. Outputs a driving control signal for blocking the signal, and when the HDMI signal is detected, the first switch 104 and the second switch 110 are switched on to supply the power Vcc and perform crystal oscillation. Outputs a drive control signal.

When the first switching unit 104 does not perform the HMI function according to the switching driving control signal from the HDMI input unit 102, the first switching unit 104 switches off to supply the power Vcc to the HDMI control unit 106. In the case of performing the HMI function, switching on to supply power Vcc to the HDMI control unit 106.

Next, the HDMI control unit 106 maintains an operation stop state when it does not perform the HDMI function, and supplies it through the first switching unit 104 when it performs the HDMI function. It provides a control signal for performing the HDM (HDMI) function using the crystal oscillation provided through the power supply (Vcc) and the second switching unit 110. At this time, in response to the driving control signal from the HDMI input unit 102 outputted to perform the HDMI function, the reset signal providing unit 108 outputs a reset signal for initializing the HDMI function. And the HDMI control unit 106 is initialized to output a control signal for performing the requested HMI function. Here, the reset signal providing unit 108 includes, for example, a delay element or the like for providing the reset signal after providing the power supply and the crystal oscillation signal.

On the other hand, when the second switching unit 110 does not perform an HMI function according to the switching driving control signal from the HDMI input unit 102, the second switching unit 110 switches off the crystal oscillation to the HDMI control unit 106, When performing an HDMI function, switching on provides a crystal oscillation signal to the HDMI controller 106.

Next, when the HMI device having the configuration as described above does not perform the HMI function, the power supply and the crystal oscillation are blocked, and the HMD function is performed. The process of providing a power supply and crystal oscillation signal is described.

2 is a flowchart illustrating a process of performing an HMI function according to an embodiment of the present invention.

Referring to FIG. 2, in the standby mode of the HMI device (step 202), the HDMI input unit 102 detects whether the HMI function is performed through the hot plug port (step 204). ). Here, in the standby mode of the HMI device, the first switching unit 104 and the second switching unit 110 are switched off so that power supply (Vcc) to the HDMI control unit 106 and crystal oscillation are blocked. .

As a result of the check in step 204, when the HDMI function is detected through the hot plug port, the HDMI input unit 102 outputs a driving control signal for performing the HDMI function ( Step 206).

In addition, the first switching unit 104 is switched on according to the driving control signal from the HDMI input unit 102 to supply power Vcc to the HDMI control unit 106 to perform the HDMI function. The second switching unit 110 is switched on according to the driving control signal from the HDMI input unit 102 to provide a crystal oscillation signal to the HDMI control unit 106 to perform an HDMI function (step 208, 210).

In addition, the reset signal providing unit 108 provides a reset signal to the HDMI control unit 106 provided with the power supply and the crystal oscillation signal according to the driving control signal output from the HDMI input unit 102 (step 212).

Subsequently, the HDMI control unit 106 is driven according to the power supplied through the first switching unit 104 and the second switching unit 110 and the crystal oscillation signal provided, and the reset signal from the reset signal providing unit 108. According to the initialization of the HDMI control unit 106, and outputs a control signal for performing the requested HDMI (HDMI) function (step 214).

Therefore, by supplying the power supply and the crystal oscillation signal only when performing the HMI function in the HDMI device, the HMD function is prevented by preventing the noise caused by the crystal oscillation and the power supply. Can be performed stably.

In the foregoing description, the present invention has been described with reference to preferred embodiments, but the present invention is not necessarily limited thereto. Those skilled in the art will appreciate that the present invention may be modified without departing from the spirit of the present invention. It will be readily appreciated that branch substitutions, modifications and variations are possible.

As described above, the present invention is different from the conventional method in which the power supply and the crystal oscillation signal are provided even when the HDMI function is not performed. It supplies power by switching on according to the HDMI drive control signal, provides a crystal oscillation signal, provides a reset signal according to the HDMI drive control signal, and according to the power and crystal oscillation signal. After driving the HMD function, it initializes according to the reset signal and outputs a control signal for performing the HMD function after initialization, so that the power is supplied only when the HMD function is performed. Supply and crystal oscillation signals can be provided to prevent noise.

Accordingly, EMI can be reduced by providing a power supply and a crystal oscillation signal only when performing the HDM function to prevent the occurrence of noise.

Claims (3)

As a method of controlling an HDMI device that performs an HDMI function, Checking whether the HMI function is performed; Outputting an HDMI driving control signal when performing the HDMI function; Switching on according to the outputted HDMI drive control signal; Switching on to supply power and to provide a crystal oscillation signal; Providing a reset signal according to the HMI driving control signal; Initiating the HMD function according to the power and crystal oscillation signals and initializing the HMD function according to the reset signal; Outputting a control signal for performing the HDMI function after the initialization; Control method of HDM device comprising a. The method of claim 1, The checking of whether to perform the HDMI function, the control method of the HMD device, characterized in that the detection is performed using a hot plug port. The method of claim 1, The reset signal may be provided after a predetermined time delay after the power supply and the crystal oscillation signal are provided.

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