KR970031780A

KR970031780A - A circuit for stabilizing pictures in a display system

Info

Publication number: KR970031780A
Application number: KR1019950042889A
Authority: KR
Inventors: 윤병남
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-11-22
Filing date: 1995-11-22
Publication date: 1997-06-26

Abstract

본 발명은 디스플레이장치에 있어서 전원인가시 화면안정화회로에 관한 것으로서, 비디오카드로 부터 공급되는 R.G.B. 수평/수직 동기신호를 각부로 공급하는 D-sub 콘넥터, 수직동기신호를 이용하여 수직톱니파전류를 발생하는 수직편향부, 수평동기신호를 이용하여 수평톱니파전류와 플라이백 펄스를 발생하는 수평편향부, 플라이백 펄스를 이용하여 고압을 발생시켜 CRT로 인가하는 고압부, R.G.B. 신호를 소정의 전압레벨로 증폭하여 CRT로 인가하는 프리앰프 및 비디오출력부와 각부의 전원전압을 공급하는 전원부를 구비한 디스플레이장치에 있어서, 전원인가시 혹은 모드변경시 마이콤에서 출력되는 뮤트신호가 '하이'레벨인 구간동안 수평편향부의 플라이백트랜스포머에 전원전압이 인가되지 않도록 제어하기 위한 제어부로 구성된다. 따라서, 전원인가시 혹은 모드변경시 마이콤에서 출력되는 뮤트신호를 이용하여 모니터의 다른 회로부가 모두 정상동작하기 전에는 플라이백트랜스포머의 1차측에 전원전압(B)이 인가되지 않도록 제어함으로써 전원인가시 혹은 모드변경시 수평출력트랜지스터가 파괴되는 것을 방지할 수 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen stabilization circuit when a power is applied to a display device, which is supplied from a video card. D-sub connector to supply horizontal / vertical sync signal to each part, vertical deflection part to generate vertical sawtooth current using vertical sync signal, and horizontal deflection part to generate horizontal sawtooth current and flyback pulse using horizontal sync signal , High voltage part to generate high voltage by using flyback pulse to CRT, RGB A display device comprising a preamplifier and a video output unit for amplifying a signal to a predetermined voltage level and applying it to a CRT, and a power supply unit for supplying power voltages to each unit. And a control unit for controlling the power supply voltage to not be applied to the flyback transformer of the horizontal deflection unit during the 'high' level. Therefore, by applying the mute signal output from the microcomputer during power supply or mode change, the power supply voltage (B) is controlled so that the power supply voltage (B) is not applied to the primary side of the flyback transformer until all other circuit parts of the monitor operate normally. It is possible to prevent the horizontal output transistor from being destroyed when the mode is changed.

Description

A circuit for stabilizing pictures in a display system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 디스플레이장치에 있어서 본 발명에 의한 전원인가시 화면안정화회로를 나타낸 회로도.3 is a circuit diagram showing a screen stabilization circuit upon application of power according to the present invention in a display device.

Claims

R.G.B. supplied from video card D-sub connector for supplying horizontal / vertical sync signal to each part, vertical deflection part for generating vertical sawtooth current using the vertical sync signal, and horizontal sawtooth current and horizontal for generating flyback pulse using the horizontal sync signal A bias unit, a high voltage unit generating a high voltage using the flyback pulse, and applying the CRT to the CRT, a preamplifier, a video output unit, and a power supply voltage for amplifying the RGB signal to a predetermined voltage level and applying the CRT to the CRT. A display device having a power supply, comprising: a control unit for controlling a power supply voltage not to be applied to a flyback transformer of the horizontal deflection unit during a period when a mute signal output from the microcomputer is 'high' level when power is applied or a mode is changed; Screen stabilization circuit when the power supply, characterized in that it comprises a.

※ Note: The disclosure is based on the initial application.