KR980007564A

KR980007564A - Sub-Screen Brightness Control Unit of Television Receiver

Info

Publication number: KR980007564A
Application number: KR1019960023377A
Authority: KR
Inventors: 조민수
Original assignee: 배순훈; 대우전자주식회사
Priority date: 1996-06-24
Filing date: 1996-06-24
Publication date: 1998-03-30

Abstract

본 발명은 텔레비전 수상기에서 부화면에 대한 ABL 회로를 구성하고, 부화면의 휘도레벨이 큰 경우에는 부화면의 휘도레벨만을 자동으로 제한하므로써 부화면의 밝기가 주화면의 화질에 영향을 미치지 않도록 한 텔레비젼 수상기의 부화면 밝기제어장치에 관한 것이다. 본발명은 주화면에 대한 영상신호와 부화면에 대한 영상신호를 블랭킹펄스에 동기하여 합성하고, 이렇게 합성된 신호를 처리하여 주화면을 일부 구획한 부분에 부화면을 발생시키며, CRT상을 흐르는 빔전류를 검출한 후에 이에 의거하여 휘도를 자동으로 제한하는 기능을 구비한 부화면 텔레비전 수상기에 있어서, 상기 블랭킹펄스에 동기하여 주화면에 대한 빔전류와 주화면에 대한 빔전류를 분리하는 수단 및 상기 부화면에 대한 빔전류를 검출하여 부화면에 대한 휘도레벨을 검출하고, 상기 검출된 휘도레벨이 소정의 기준치이상인 경우에는 상기 부화면에 대한 휘도레벨을 소정치만큼 감소시키는 부화면휘도자동제한수단을 구비한 것을 특징으로 한다.The present invention configures an ABL circuit for a sub-screen in a television receiver, and automatically limits only the luminance level of the sub-screen when the luminance level of the sub-screen is large so that the brightness of the sub-screen does not affect the image quality of the main screen. A sub-screen brightness control apparatus for a television receiver. The present invention synthesizes a video signal for a main picture and a video signal for a sub picture in synchronization with a blanking pulse, and processes the synthesized signal to generate a sub picture in a part of the main picture, and flows the CRT image. A sub-screen television receiver having a function of automatically limiting brightness after detecting a beam current, comprising: means for separating the beam current for the main screen and the beam current for the main screen in synchronization with the blanking pulse; Detects the luminance level of the sub-screen by detecting the beam current for the sub-screen, and if the detected luminance level is greater than or equal to a predetermined reference value, the sub-screen luminance automatic limit for reducing the luminance level of the sub-screen by a predetermined value. It is characterized by having a means.

Description

Sub-Screen Brightness Control Unit of Television Receiver

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명의 양호한 실시예에 따른 텔레비젼 수상기의 부화면 밝기제어장치의 블록구성도.2 is a block diagram of a sub-screen brightness control apparatus for a television receiver according to a preferred embodiment of the present invention.

제3도는 본 발명에 따른 부화면 밝기제어동작을 설명하기 위한 파형도.3 is a waveform diagram for explaining a sub-screen brightness control operation according to the present invention.

Claims

The video signal for the main picture and the video signal for the sub picture are synthesized in synchronization with a blanking pulse, and the synthesized signals are processed to generate a sub picture in a part of the main picture, and the beam current flowing through the CRT A sub picture television receiver having a function of automatically limiting luminance based on the detection after the detection, comprising: means for separating the beam current for the main picture and the beam current for the main picture in synchronization with the blanking pulse; A sub-screen luminance limiting means for detecting a luminance level of the sub-screen by detecting a beam current for the sub-screen, and decreasing the luminance level of the sub-screen by a predetermined value when the detected luminance level is equal to or greater than a predetermined reference value. Sub-screen brightness control device of a television receiver, characterized in that.