KR200172656Y1 - Regulation circuit for mute time of monitor - Google Patents

Abstract

The present invention relates to a mute time adjusting circuit of a monitor. In particular, when a consumer uses a mute phenomenon caused by a change in the frequency of the monitor, the mute time adjusting circuit of the monitor can reduce the muting time in the monitor production process. It is about.

Conventionally, since the raster mute circuit has the same mute time in the production process or when the raster mute circuit is used by the consumer during the mode switching of the monitor, there is a problem that the productivity decrease due to the mute time in the monitor production process.

The present invention provides a means for shortening the mute time in the monitor production process while keeping the mute time due to the mute signal of the monitor to normal operation to solve the above problems, according to the reduction of the mute time in the monitor production process To improve the production process.

Description

Monitor mute time adjustment circuit

The present invention relates to a mute time adjustment circuit of a monitor that allows a normal operation when a user uses a phenomenon in which the screen is muted due to a change in monitor frequency, and shortens the mute time during monitor production. will be.

The mute time adjustment circuit of the conventional monitor is shown in FIG.

A horizontal synchronous signal discrimination unit 1 for discriminating according to the presence or absence of a horizontal synchronous signal HS, a transistor Q1 turned on / off in accordance with the discrimination of the horizontal synchronous signal HS, and the transistor Q1 Resistor R1 and diode D1 for applying the heater voltage HV to the emitter, and transistor Q2 for controlling the first grid voltage G1 of the CRT 4 according to whether the transistor Q1 is operated. ), A horizontal / vertical blanking unit 2 for canceling horizontal / vertical blanking, and a brightness adjusting unit 3 for adjusting screen brightness.

Reference numeral R2-R5 is a resistor, C1, C2 is a capacitor, D2 is a diode.

Referring to the operation of the conventional raster mute circuit is configured as follows.

First, when the horizontal synchronizing signal HS is normally input to the horizontal synchronizing signal discriminating unit 1, the high synchronizing signal High is output from the horizontal synchronizing signal discriminating unit 1 so that the transistor Q1 is turned off. Transistor Q2 is also turned off.

As the transistor Q2 is turned off, the first grid G1 is at a constant level to maintain a normal screen state.

On the other hand, when the mode is switched in which the horizontal synchronization signal HS is not input, since the low signal Low is output from the horizontal synchronization signal determination unit 1 and the transistor Q1 is turned on, the transistor Q2 is also turned on. Is on.

By the turn-on of the transistor Q2, the level of the first grid G1 of the CRT 4 falls toward the negative voltage (-B), thereby preventing the distortion of the screen which occurs momentarily during the mode switching. .

Conventionally, the last mute circuit is applied when switching the monitor mode as described above, but in order to prevent the unstable screen from appearing during the mode conversion, the mute time is set to be constant when used by the production process or the consumer, and thus additionally required in the monitor production process. This mute time leads to a decrease in productivity.

In order to solve the problems described above, the present invention provides a means for normal operation when the consumer uses the monitor's mute time, and a means for shortening according to the state of the ST terminal in the production process, thereby improving monitor productivity. It is in a ship.

1 is a block diagram of a mute time adjustment circuit of a conventional monitor

2 is a block diagram of a mute time adjustment circuit of the present invention monitor

The mute time adjustment circuit of the present invention monitor is shown in Figure 2,

Control means 11 for outputting the mute signal, capacitors C11 and C12 for charging and discharging the mute signal, and mute signals applied to the mute input circuits 13 and 14 through the capacitor C12. The mute for controlling the operation of the transistor Q11 according to the state of the ST terminal (Self Test) of the transistor Q11 turned on / off by the mute time adjusting means 12 and the mute time for the mute signal. Time adjustment means (12).

The mute time adjusting means 12 includes a resistor (R13) and a capacitor (C13) for integrating a signal applied according to a ST (Self Test) terminal state of a signal cable (S / cable), and the signal applied to the integrated signal. The transistor Q12 is turned on / off accordingly.

Here, transistor Q11 is an N-channel FET, reference numerals R11, R12, R14, and R15 are resistors, and Q13 is a transistor.

First, the mute signal output from the control means 11 is a signal that is output when the horizontal or vertical frequency changes. By using this signal, the screen is disappeared momentarily by muting an abnormal screen state when the mode is changed. It is a signal to display the screen.

When the mute signal output to the control means 11 is in normal operation, that is, used by the consumer, the mute signal is charged and discharged in the parallel-connected capacitors C11 and C12.

The mute signal charged and discharged by the capacitor C11 is applied to the mute input circuits 13 and 14, and the mute signal charged and discharged by the capacitor C12 is muted according to the operation of the transistor Q11. Applied to the input circuit (13) (14),

At this time, since the ST terminal (Self Test) of the signal cable (S / Cable) is grounded (GND), the mute time adjustment means 12 is not operated. That is, no signal is applied to the base of the transistor Q12 by the ST terminal ground signal, and the signal is turned off.

The mute signal charged and discharged in the capacitor C12 by turning off the transistor Q12 is applied to the mute input circuits 13 and 14 by turning on the transistor Q11 through the resistor R14. do.

On the other hand, when the monitor is produced, if the ST terminal is floated, the ST terminal is applied to the mute time adjusting means 12, the high signal,

At this time, the high signal is integrated in the resistor R13 and the condenser C13 of the mute time adjusting means 12 and applied to the base of the transistor Q12 to turn it on.

The transistor Q11 connected to the collector terminal and the base is turned off by the on of the transistor Q12, and the mute signal output from the control means 11 by the off of the transistor Q11 is only via the capacitor C11. Since it is applied to the mute input circuits 13 and 14, the mute time is shorter than during normal operation.

Here, conventionally, when the mute time is about 500ms, the unstable screen does not appear when the mode is changed (resolution change).

If the 12 modes (resolution) are adjusted to the production equipment in the production process, the time required due to the mute time,

500ms × 12 (number of modes) × number of production (10,000 units / day) = 16.6 HRS,

If the mute time is shortened to 100ms in the production process, the time required for mute time is

100 ms × 12 RO (number of modes) × 10,000 (number of units produced per day) = 3.3 HRS.

Thus, the additional time required for the mute time between normal operation and the production process is 16.6 HRS-3.3 HRS = 13 HRS.

Therefore, the additional time required according to the mute time is saved, resulting in the effect of storing the production by 13 HRS as a whole.

If the mute time is completely deleted, the effect is doubled. However, the deletion of the mute time is difficult because the circuit may be damaged in the transient state.

The present invention is effective in improving the productivity of the monitor by allowing the screen to be muted when the frequency of the monitor changes, so that the consumer can operate normally and reduce the mute time when the monitor is produced.

Claims (1)

A control means 11 for outputting a mute signal to correct an abnormal screen state when the horizontal or vertical frequency is changed, a capacitor C11 (C12) for charging and discharging a mute signal of the control means 11, and the condenser C12 Switching operation of the transistor Q11 according to the state of the signal terminal S / Cable ST terminal and switching the mute signal of A mute time adjustment circuit of a monitor, characterized by comprising a mute time adjustment means (12) for controlling.