KR200325906Y1 - Apparatus for removing remain high-voltage of crt - Google Patents

Abstract

The present invention relates to a device for grounding the high voltage remaining in the anode end of the CRT when the power of the CRT (Cathode Ray Tube) off. Conventionally, for example, a display device using a CRT, after the user turns off the power of the television, when the user disassembles the television and touches the CRT's anode end to clean the inside of the television, electric shock is caused by the residual high voltage. In addition, when the service technician touches the CRT while checking the television or replaces the CRT, the electric shock may be caused by the residual high voltage. That is, the residual high voltage is sufficient to cause an electric shock even when the television is turned off. The present invention eliminates the high voltage remaining in the anode end of the CRT by grounding the anode end of the CRT when the CRT is powered off. Therefore, an electric shock accident due to the residual high pressure of the CRT can be prevented.

Description

Residual high pressure removal device of CrT {APPARATUS FOR REMOVING REMAIN HIGH-VOLTAGE OF CRT}

The present invention relates to a device for removing a residual high pressure of a cathode ray tube (CRT), and more particularly, to an apparatus for grounding a high voltage remaining at an anode end of a CRT when the power of the CRT is turned off.

In general, in a display device using a CRT, a few kilovolts of high voltage remains in the anode stage of the CRT even after the power is turned off, and then gradually drops to several hundred volts.

Therefore, in the related art, for example, a display device using a CRT, a residual high pressure when the user disassembles the television and touches the CRT's anode end to clean the inside of the television after the user turns off the television. Electric shock. In addition, when the service technician touches the CRT while checking the television or replaces the CRT, the electric shock may be caused by the residual high voltage. That is, the residual high voltage is sufficient to cause an electric shock even when the television is turned off.

The present invention has been made to solve the above-described drawbacks, to provide a CRT residual high pressure removal device to remove the high pressure remaining in the anode end of the CRT by grounding the anode end of the CRT when the power of the CRT off Its purpose is to.

The present invention for achieving the above object, in a display device having a CRT, to execute a key input unit for key input to execute a specific function of the display device, and a function corresponding to the key input of the key input unit Micom for outputting a command for; An image signal processor for processing a video signal according to the command of the microcomputer and outputting a horizontal sync signal and the R, G, and B signals for the CRT, and a horizontal sync signal provided from the video signal processor to detect an anode of the CRT. And a grounding part for grounding the high-pressure output of the high-pressure generating part and removing the residual high-pressure applied to the anode end of the CRT when a power-off command is provided from the microcomputer. It is done.

1 is a block diagram showing an embodiment of an apparatus for removing residual high pressure of a CRT according to the present invention;

Figure 2 is a flow chart illustrating a step-by-step process of removing the residual high pressure in the residual high pressure removal device of the CRT shown in FIG.

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

1 is a block diagram showing an embodiment of a CRT residual high pressure removing device according to the present invention, the key input unit 10, the microcomputer 12, the image signal processing unit 14, the high pressure generating unit 16, the CRT (18) ), And a ground portion 20.

In the figure, the key input unit 10 inputs the key to the microcomputer 12 by a user's key operation to execute a specific function of the display device with the CRT 18. For example, the key input unit 10 performs key input for turning on or off the power of the display device according to a user's key manipulation.

The microcomputer 12 outputs a command for executing a function corresponding to the key input of the key input unit 10 to the image signal processing unit 14 and the ground unit 20.

The image signal processor 14 processes the image signal corresponding to the image to be displayed according to the command of the microcomputer 12 and outputs a horizontal synchronization signal and C, R, G, and B signals. At this time, the horizontal synchronizing signal is provided to the high voltage generator 16 and the R, G, and B signals for the CRT are provided to the CRT 18.

The high pressure generator 16 detects a horizontal synchronizing signal provided from the image signal processor 14 to generate a high pressure and provides the high voltage to the anode of the CRT 18.

The ground unit 20 removes the residual high pressure applied to the anode end of the CRT 18 by grounding the high voltage output terminal of the high voltage generator 16 when a power-off command is provided from the microcomputer 12.

FIG. 2 is a flowchart illustrating a process of removing the residual high pressure in the residual high pressure removing apparatus of the CRT shown in FIG. 1.

First, a user manipulates a key of the key input unit 10 to input a key corresponding to a desired command to the microcomputer 12 (step 22). For example, the user manipulates a key of the key input unit 10 to input a key corresponding to the power off command to the microcomputer 12.

The microcomputer 12 determines whether the key provided from the key input unit 10 is a power off command (step 24).

If the key provided from the key input unit 10 is a power-off command, the microcomputer 12 controls the ground unit 20 to ground the high-voltage output terminal of the high-voltage generator 16 for a predetermined time, and then the CRT 18. Remove residual high pressure on the anode stage of step (step 26).

On the other hand, if the key provided from the key input unit 10 is not the power-off command, the microcomputer 12 performs the corresponding command (step 28).

As described above, the present invention removes the high voltage remaining in the anode end of the CRT by grounding the anode end of the CRT when the power supply of the CRT is turned off. Therefore, an electric shock accident due to the residual high pressure of the CRT can be prevented.

Claims (2)

In the display device provided with a CRT, A key input unit for inputting a key to execute a specific function of the display device; A microcomputer for outputting a command for executing a function corresponding to a key input of the key input unit; An image signal processor for processing an image signal according to the command of the microcomputer and outputting a horizontal synchronization signal and the C, R, G, and B signals; A high pressure generator for detecting a horizontal synchronization signal provided from the image signal processor and providing a high pressure to an anode of the CRT; A ground unit for grounding the high voltage output terminal of the high voltage generator to remove residual high voltage applied to the anode terminal of the CRT when a power-off command is provided from the microcomputer; Residual high pressure removal device of the CRT comprising a. The apparatus of claim 1, wherein the ground unit grounds the high voltage output terminal of the high voltage generator for a predetermined time when a power-off command is provided from the microcomputer.