KR0123418B1 - A cricuit of mute signal in monitor system - Google Patents

Abstract

The present invention is to provide an apparatus for generating mute singal of monitor. The apparatus for generating mute singal of monitor according to the present invention comprises a video board 20 for amplifying R,G,B color signal from a microprocessor(10) of a general computer and for outputting light signal corresponding to the R,G,B color signal; a cathode ray tube(30) for displaying the R,G,B color signal from said video board; and a main board(60) for processing a vertical synchronization signal and a horizontal synchronization signal from the microprocessor and for applying the light signal and the R,G,B color signal from said video board to a vertical deflecting unit(40) and a horizontal defecting unit(50), said apparatus comprising: a mute signal generating means 65 for removing output of video signal scanned in said video board if neither the vertical synchronization signal nor horizontal synchronization signal is inputted to said main board. Thereby, the present invention can remove spots and noise of monitor.

Description

Mute signal generation circuit of monitor

1 is a view showing the configuration of a general monitor.

2 is a view showing the configuration of a mute signal generating circuit applied to a monitor according to the present invention.

3 is a detailed circuit diagram showing the configuration of the mute signal generator of FIG.

* Explanation of symbols for main parts of the drawings

10: microprocessor 20: video board

30: cathode ray tube 40: vertical deflection portion

50: horizontal deflection portion 60: main board

61: vertical sync signal generator 62: horizontal sync signal generator

63: vertical drive unit 64: horizontal drive unit

65 mute signal generator 651,652: filter unit

653,654: rectifier 655,656: switching part

C1-C4: capacitor D1-D2; diode

Q1, Q2: transistor R1-R3: resistor

The present invention relates to a mute signal generating circuit of a monitor. In particular, when one or more of the horizontal synchronizing signal or the vertical synchronizing signal of a monitor is not input, a mute signal is generated to prevent the video signal from being displayed on the screen. And a mute signal generating circuit of a monitor capable of removing noise and improving image quality.

A general monitor is a video board (2) for amplifying the R, G, B color signals output from the microprocessor (1) of a computer, and outputting brightness signals for the R, G, B color signals as shown in FIG. ), A cathode ray tube 3 for displaying the R, G, and B color signals output from the video board 2, a vertical synchronizing signal Vs and a horizontal synchronizing signal output from the output from the microprocessor 1 Vertical deflection unit 4 and horizontal deflection unit for deflecting the screen brightness signal for controlling the brightness of the entire screen and the R, G, B color signals output from the video board 2 in the vertical or horizontal direction after processing Hs); It consists of the main board 6 applied to 5).

Referring to the operation of the conventional monitor configured as described above, first, the R, G, B color signals, which are video signals output from the microprocessor 1 of the computer, are applied to the video board 2 and amplified, and then applied to the cathode ray tube 3. do.

At this time, the horizontal synchronizing signal Hs and the vertical synchronizing signal Vs of the pulse waveform output from the microprocessor 1 are applied to the main board 6 to be converted into the triangular waveform vertical synchronizing signal and the synchronizing signal, respectively. The converted vertical synchronizing signal and the horizontal synchronizing signal are amplified to a magnitude for driving the horizontal deflection unit 4 and the vertical deflection unit 5.

The horizontal synchronizing signal and the vertical synchronizing signal output from the main board 6 are applied to the vertical deflection unit 5 and the horizontal deflection unit 1 so that the R, B, G and color signals are transmitted to the cathode ray tube 3. Is injected into.

That is, the R, G, and B color signals output from the video board 2 are deflected and scanned by the cathode ray tube 3 by the horizontal synchronizing signal and the vertical synchronizing signal output from the main board 6.

The above-described green monitor has a normal on mode, a standby mode in which the voltage decreases momentarily, a suspend mode in which the voltage is reduced for a longer time than the standby mode, and a minimum power consumption. There is an off mode.

In the on mode of the monitor, both the horizontal and vertical synchronizing signals Hs (Vs) are normally applied to the main board 6 of the monitor by the microprocessor 1 of the computer, and in the standby mode of the monitor, the vertical synchronizing signals ( Only Vs) is applied to the main board 6, only the horizontal sync signal Hs is applied in the suspend mode, and the horizontal and vertical sync signal Hs (Vs) modes are applied to the main board 6 in the off mode. It doesn't work.

Therefore, when the general monitor enters the standby mode or the suspend mode or the off mode, the horizontal synchronizing signal Hs or the vertical synchronizing signal Vs is not output from the microprocessor 1 of the computer. In the displayed screen, spot phenomenon and noise caused by the collapse of the R, G, and B color signals are displayed on the screen.

That is, as described above, the standby mode of the computer is in a state where the video signal is collapsed, so that the eyes of the user may be tired, which may be determined to be a malfunction, and the image quality is deteriorated.

However, when the standby mode or the suspend mode and the off mode are used in the green computer used to minimize the power consumption recently, the microprocessor 1 of the computer outputs a mute signal to the main board 6, The mute signal is applied to the video board 2 to remove the output of the R, G, B color signals scanned to the cathode ray tube 3 and scans the cathode ray tube 3 with no signal, thereby increasing the image quality but increasing the price. There was a problem.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to generate a mute signal when one or more of the horizontal synchronization signal and the vertical synchronization signal are not input to the main board to generate a no signal to the cathode ray tube. It is an object of the present invention to provide a mute signal generating circuit of a monitor whose image quality is increased by scanning.

In order to achieve the above object, the present invention generally amplifies R, G, and B color signals output from a microprocessor of a computer, and outputs a brightness signal for the R, G, and B color signals, and outputs from the video board. R, G, B color signal to display the negative library, and a screen brightness signal for controlling the overall brightness of the screen after processing the vertical synchronization signal and the horizontal synchronization signal output from the microprocessor R and output from the video board, A monitor comprising a vertical deflection portion for biasing a G and B color signal in a vertical or horizontal direction and a main board for applying the horizontal deflection portion, wherein at least one of a horizontal synchronizing signal and a vertical synchronizing signal output from the microprocessor of the computer Mu to remove the output of the video signal being scanned from the video board if it is not input By providing the mute signal generating circuit in which a signal generating means further comprises can be achieved.

An embodiment of a mute signal generation circuit applied to a monitor according to the present invention will be described in more detail with reference to the accompanying drawings.

2 is a view showing the configuration of a mute signal generating circuit applied to a monitor according to the present invention. As shown in FIG. 2, amplifying R, G, and B color signals output from a microprocessor 10 of a computer, A video board 20 for outputting brightness signals for R, G and B color signals, a cathode ray tube 30 for displaying R, G and B color signals output from the video board 20, and the microprocessor 10 After processing the vertical synchronization signal (Vs) and the horizontal synchronization signal (Hs) output from the screen brightness signal for controlling the brightness of the entire screen and the R, G, B color signal output from the video board 20 vertical or horizontal The mute signal is applied to the vertical deflection unit 40 and the horizontal deflection unit 50 which deflect in the direction, and when at least one of the vertical synchronizing signal Vs or the horizontal synchronizing signal Hs is not input from the microprocessor 10. Is outputted above The main board 60 removes the R, G, and B color signals output from the video board 20.

Here, the main board 60 is a vertical synchronous signal generator 61 and a horizontal synchronous signal (Vs) and the horizontal synchronous signal (Vs) of the pulse waveform output from the microprocessor 10 is converted into a triangular waveform and horizontal Vertical driver 63 and horizontal driver 64 for amplifying the vertical synchronizing signal and the horizontal synchronizing signal output from the synchronizing signal generating unit 62, the vertical synchronizing signal generating unit 61, and the horizontal synchronizing signal generating unit 62, respectively. ) And a mute signal generator 65 for generating a mute signal and removing the output of the R, G, and B color signals when the vertical synchronizing signal Vs and the horizontal synchronizing signal Hs are not input from the microprocessor 10. It consists of.

As shown in FIG. 3, the mute signal generator 65 includes a condenser C1 (C2) and a resistor R1 (R2) to high pass filter the input vertical sync signal and the horizontal sync signal, respectively. Rectifiers 653 and 654 composed of filter sections 651 and 652, diodes D1 and D2, respectively, for rectifying signals output from the filter sections 651 and 652, and transistors Q1 ( Q2), and is switched according to the state of the output signal of the rectifiers 653 and 654 to output the mute signal.

Reference numerals C3 and C4 are rectifier capacitors for rectifying the mute signals output from the switching units 655 and 656, and reference numerals R3 are resistors for driving the transistor Q1.

Referring to the operation of the monitor applied to the present invention configured as described above are as follows. First, R, G, and B color signals, which are video signals output from the microprocessor 10 of the computer, are applied to the video board 20, amplified, and then applied to the cathode ray tube 30.

At this time, the vertical sync signal Hs and the horizontal sync signal Vs of the pulse waveform output from the microprocessor 10 are vertical sync signal generator 61 and horizontal sync signal generator 62 of the main board 60. ) Is converted into a vertical synchronizing signal and a horizontal synchronizing signal of a triangular waveform, respectively, and the converted vertical synchronizing signal and the horizontal synchronizing signal are applied to the vertical driving unit 63 and the horizontal driving unit 64 to the horizontal deflection unit 40. And amplified to a magnitude for driving the vertical deflection section 50.

The horizontal synchronizing signal and the vertical synchronizing signal output from the main board 60 are applied to the vertical deflection unit 50 and the horizontal deflection unit 40 so that the R, G and B color signals are transmitted to the cathode ray tube 30. Is injected.

That is, the R, G, and B color signals output from the video board 20 are deflected and scanned by the cathode ray tube 30 by the horizontal synchronization signal and the vertical synchronization signal output from the main board 60.

In addition, when the monitor enters the standby mode, the high potential vertical synchronization signal Vs and the low potential horizontal synchronization signal Hs input from the microprocessor 10 are filtered by the filter unit 651 of the mute signal generator 65. Vertical synchronization signal (Vs) of high potential removed and high frequency removed by capacitor (C1) and resistor (R1), capacitor (C2), and resistor (R2) of 652) and horizontal synchronization of low potential state. The signal Hs is applied to the diodes D1 and D2 of the rectifiers 653 and 654 to respectively rectify.

Thereafter, the rectified high-potential vertical synchronizing signal Vs and the low-potential horizontal synchronizing signal Hs are applied to the base side of the transistors Q1 and Q2 of the switching units 655 and 656, respectively. Transistor Q1 is turned on but transistor Q2 is turned off.

Accordingly, the high potential mute signal is output, and the R, G, B color signals output from the video board 20 to the cathode ray tube 30 are removed by the high potential mute signal, thereby displaying a screen of no signal. .

On the other hand, in the suspend mode of the monitor, the low potential vertical synchronizing signal Vs and the high potential state horizontal synchronizing signal Hs input from the microprocessor 10 are the filter unit 651 of the mute signal generator 65. Vertical synchronization signal (Vs) in the high potential state and high frequency removed by the capacitor (C1) and resistor (R1), capacitor (C2) and resistor (R2) of 652) and horizontal synchronization in high potential state. The signal Hs is applied to the diodes D1 and D2 of the rectifiers 653 and 654 to respectively rectify.

Thereafter, the rectified low-potential vertical synchronizing signal Vs and the high-potential horizontal synchronizing signal Hs are applied to the base side of the transistors Q1 and Q2 of the switching units 655 and 656, respectively. Transistor Q1 is turned off but transistor Q2 is turned on.

Accordingly, the high potential mute signal is output, and the R, G, B color signals output from the video board 20 to the cathode ray tube 30 are removed by the high potential mute signal, thereby displaying a screen of no signal. .

When the monitor is in the off mode, since the vertical synchronizing signal Vs and the horizontal synchronizing signal Hs that are input are in a low potential state, both the transistors Q1 and Q2 are turned off to output a mute signal in a high potential state.

On the other hand, when the monitor is in the on mode, the high potential vertical synchronizing signal (Vs) input from the monitor 10 and the horizontal synchronizing signal (Hs) in the high potential state are the filter unit 651 (the mute signal generator 65) ( The high-frequency removed vertical synchronizing signal (Vs) and the high-frequency horizontal synchronizing signal (high frequency removed) by the capacitor (C1) and the resistor (R1), the capacitor (C2) and the resistor (R2) of 652. Hs is applied to the diodes D1 and D2 of the rectifiers 653 and 654 to respectively rectify.

Thereafter, the rectified high-potential vertical synchronizing signal Vs and the horizontal synchronizing signal Hs are applied to the base side of the transistors Q1 and Q2 of the switching units 655 and 656, respectively. All of Q2 is turned on.

Accordingly, the low potential mute signal is outputted, and the R, G, B color signals outputted from the video board 20 to the cathode ray tube 30 are outputted by the low potential mute signal. The color signal is displayed on the screen.

As described above, in the mute signal generating circuit according to the present invention, when one or more of the vertical synchronizing signal and the horizontal synchronizing signal are not input, a high potential mute signal is generated and outputted from the video board R, G. By removing the B color signal, the image quality is increased in the standby mode, the suspend mode, and the off mode of the monitor.

Claims (2)

A video board 20 which amplifies R, G, and B color signals output from a microprocessor 10 of a computer, and outputs a brightness signal for the R, G, and B color signals, and outputs from the microprocessor 10. After processing the vertical synchronization signal (Vs) and the horizontal synchronization signal (Hs) to the screen brightness signal for controlling the overall brightness of the screen and the R, G, B color signal output from the video board 20 in the vertical or horizontal direction In the monitor comprising a vertical deflection portion 40 for deflecting and a main board 60 applied to the horizontal deflection portion 50, the horizontal synchronization signal Hs output from the microprocessor 10 to the main board 60. And mute signal generating means (65) for removing the output of the board signal scanned from the video board (20) when one or more of the vertical synchronization (Vs) signal is not input. signal Generating circuit. 2. The mute signal generating means (65) according to claim 1, wherein the mute signal generating means (65) includes a filter section (651) 652 for high pass filtering the vertical synchronization signal (Vs) and the horizontal synchronization signal (Hs), respectively, and the filter section (651) (652). Rectification unit 653 and 654 for rectifying the signals output from the control panel; and switching units 655 and 656 which are switched according to the state of the output signal of the rectifying unit 653 and 654 to output the mute signal. Mute signal generation circuit of the monitor, characterized in that.