KR940003319A - Horizontal phase adjustment circuit of the monitor - Google Patents

Abstract

The present invention relates to a horizontal phase adjustment circuit of a monitor, wherein the horizontal phase adjustment circuit of the motor according to the present invention includes a timer (20), and the resistor (Rt) and the capacitor (Ct) of the timer (20) When a stable square wave is output to the output terminal OUT of the timer 20 by changing the time constant, the sawtooth generator 30 inputs the square wave output from the timer 10 and outputs a sawtooth wave. Through 47, the crest of the sawtooth wave generated from the sawtooth generator 30 is made constant, and a compensation voltage is applied to the inverting terminal (-) of the voltage comparator OP1, and the inverting terminal (-) in the voltage comparator OP1. By comparing the sawtooth wave applied to) and the variable voltage input to the non-inverting terminal (+), a pulse of constant change in frequency and variable voltage is outputted so that the screen of the monitor can be easily and accurately adjusted according to the width of the output pulse. will be.

Description

Horizontal phase adjustment circuit of the monitor

Since this is an open matter, no full text was included.

1 is a conventional horizontal phase adjustment circuit diagram,

(A) and (b) of FIG. 2 are timing charts showing voltage waveforms in respective parts of FIG.

3 is a circuit diagram showing one embodiment of a horizontal phase adjustment circuit of a monitor according to the present invention;

(A), (b), (c), and (d) of FIG. 4 are timing charts showing voltage waveforms in respective parts of FIG.

Claims (3)

A timer 20 is triggered by a horizontal synchronization signal and outputs a square wave, and the current is converted from a variable resistor VR or a microcomputer's D / A converter 10 or a variable voltage is applied to a resistor and a capacitor. A horizontal phase adjustment circuit for changing the time constant of (27) so that the screen can be adjusted according to the width of the pulse output from the timer 20, wherein the square wave input from the timer is connected to the output side of the timer. A sawtooth wave generator 30 for outputting a sawtooth wave, a frequency / voltage converter 40 which is triggered by a horizontal synchronous signal and applies a compensation voltage in order to make the wave height of the sawtooth wave generated from the sawtooth wave generator 30 constant; A variable voltage for varying the sawtooth wave and the horizontal phase from the sawtooth wave generator 30 is input and voltage comparison is performed so that the variation range is constant between the frequency and the variable voltage. A horizontal phase adjustment circuit of a monitor comprising a horizontal phase signal generator (57) for outputting one pulse. According to claim 1, The sawtooth generator 30 is connected to the output terminal (OUT) of the timer 20, the resistor (R1, R2) for biasing and the base is connected to the two resistors (R1, R2) A transistor Q1 for switching by the bias operation of the two resistors R1 and R2, a resistor R3 connected between the constant voltage source Vcc and the collector of the transistor Q1, and the transistor Q1. And a capacitor (C1) connected between the collector and the connection point of the resistor (R3) and a resistor (R4) connected to the output terminal (OUT) of the frequency / voltage converter (40). The horizontal phase signal generator 50 includes a resistor R5 to which a variable voltage for varying the horizontal phase is applied, and a resistor connected between the constant voltage source Vcc and the resistor R5. R6) and the connection point of the two resistors R5 and R6 are a voltage comparator OP1 connected to a non-inverting stage (+), a pull-up bottom connected between an output side of the voltage comparator OP1 and a constant voltage source Vcc. Horizontal phase adjustment circuit of the monitor consisting of (R7). ※ Note: The disclosure is based on the initial application.