KR970031784A - Screen width change correction circuit according to brightness - Google Patents

Screen width change correction circuit according to brightness Download PDF

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Publication number
KR970031784A
KR970031784A KR1019950040084A KR19950040084A KR970031784A KR 970031784 A KR970031784 A KR 970031784A KR 1019950040084 A KR1019950040084 A KR 1019950040084A KR 19950040084 A KR19950040084 A KR 19950040084A KR 970031784 A KR970031784 A KR 970031784A
Authority
KR
South Korea
Prior art keywords
screen
brightness
synchronizing signal
horizontal synchronizing
width
Prior art date
Application number
KR1019950040084A
Other languages
Korean (ko)
Other versions
KR0153349B1 (en
Inventor
윤성진
Original Assignee
배순훈
대우전자 주식회사
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Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019950040084A priority Critical patent/KR0153349B1/en
Publication of KR970031784A publication Critical patent/KR970031784A/en
Application granted granted Critical
Publication of KR0153349B1 publication Critical patent/KR0153349B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/223—Controlling dimensions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/42—Flyback transformers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/50—Analogue/digital converters with intermediate conversion to time interval
    • H03M1/504—Analogue/digital converters with intermediate conversion to time interval using pulse width modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H04N5/59—Control of contrast or brightness in dependence upon beam current of cathode ray tube

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Details Of Television Scanning (AREA)

Abstract

본 발명은 밝기에 따른 화면 폭 변화 보정회로에 관한 것으로, 종래에는 CRT상에 디스플레이되는 화면의 밝기를 밝게 하면, 플라이 백 트랜스의 2 차측으로 부터 출력되는 전자 비임의 전류가 증가하여 CRT상에 디스플레이되는 화면의 밝기가 밝아지게 된다. 그러나, 화면의 밝기를 밝게 하면 화면의 밝기가 변화함과 아울러 CRT 상에 디스플레이되는 화면의 크기가 조작레버의 조작에 관계없이 커지는 문제점이 있었다. 본 발명은 모니터나 텔레비젼 수상기의 화면의 밝기를 밝게 함에 있어 이에 연동하여 화면의 수직 폭이 커지는 것을 방지하기 위하여 화면의 밝기를 밝게 할때 이에 비례하여 화면의 수직 폭을 조절하는 PWM펄스의 레벨을 조정하여 모니터나 텔레비젼 수상기의 화면 밝기의 변화에 관계없이 화면의 크기를 일정하게 유지할 수 있는 효과가 있다.The present invention relates to a screen width change correction circuit according to brightness, and conventionally, when the brightness of the screen displayed on the CRT is brightened, the current of the electron beam output from the secondary side of the flyback transformer is increased to display on the CRT. The brightness of the screen becomes brighter. However, when the brightness of the screen is bright, there is a problem that the brightness of the screen is changed and the size of the screen displayed on the CRT becomes large regardless of the operation of the operation lever. The present invention is to brighten the brightness of the screen of the monitor or television receiver in conjunction with this to prevent the increase in the vertical width of the screen to increase the brightness of the screen in proportion to the level of the PWM pulse to adjust the vertical width of the screen in proportion to this. By adjusting, there is an effect that the size of the screen can be kept constant irrespective of the change in the screen brightness of the monitor or television receiver.

Description

밝기에 따른 화면 폭 변화 보정회로Screen width change correction circuit according to brightness

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

제1도는 본 발명에 따른 회로도이다.1 is a circuit diagram according to the present invention.

Claims (3)

CRT에 주사되는 고압을 발생하기 위한 수평 동기 신호를 발진하는 수평 동기 신호 발진용 IC와; 상기 수평 동기 신호 발진용 IC의 수평 동기신호를 드라이브시키는 수평 동기 신호 드라이브부와; 상기 수평 동기 신호를 승압시키는 드라이브용 트랜스와; 상기 승압된 수평 동기 신호에 의해 전원(B+)을 증폭하는 수평 동기 신호 출력부와; 상기 수평 동기 신호 출력부의 출력으로 고압을 발생하는 플라이 백 트랜스와; 상기 플라이 백 트랜스의 고압으로 동작하는 CRT와, 화면의 수직 폭을 조절하기 위한 PWM펄스를 출력하는 출력 포트를 갖으며, 모니터나 텔레비젼 수상기의 전반적인 동작을 제어하는 마이크로 프로세서와; 상기 마이크로 프로세서로부터 출력되는 PWM펄스를 평활하여 디지탈 신호로 변환하는 아날로그/디지탈 변환부와; 상기 변환된 디지탈의 PWM펄스를 증폭하는 증폭부와; 저항으로 분배되어 인가되는 PWM펄스에 의해 CRT상에 디스플레이되는 화면의 수직폭을 조절하는 수직 화면폭 조절용 IC를 포함하여 구성된 밝기에 따른 화면 폭 변화 보정회로에 있어서, 화면밝기 조절에 따라 CRT에 인가되는 고압의 레벨 변화를 검출하는 전압 감지부와; 상기 전압 감지부의 감지 신호에 의해 수직화면 폭 조절용 IC에 인가되는 PWM펄스의 레벨을 보정하여 화면의 수직폭변화를 보정하는 수직 화면 폭 보정부로 구성되어짐을 특징으로 하는 밝기에 따른 화면 폭 변화 보정회로.A horizontal synchronizing signal oscillation IC for oscillating a horizontal synchronizing signal for generating a high voltage scanned by the CRT; A horizontal synchronizing signal driver for driving a horizontal synchronizing signal of the horizontal synchronizing signal oscillation IC; A drive transformer for boosting the horizontal synchronizing signal; A horizontal synchronizing signal output unit for amplifying a power supply B + by the boosted horizontal synchronizing signal; A flyback transformer generating high voltage at an output of the horizontal synchronization signal output unit; A microprocessor having a CRT operating at a high voltage of the flyback transformer, an output port for outputting a PWM pulse for adjusting the vertical width of the screen, and controlling the overall operation of a monitor or a television receiver; An analog / digital converter configured to smooth the PWM pulses output from the microprocessor and convert the PWM pulses into digital signals; An amplifier for amplifying the converted PWM pulses; In a screen width change correction circuit configured to include a vertical screen width adjusting IC for adjusting a vertical width of a screen displayed on a CRT by a PWM pulse applied by a resistor, it is applied to a CRT according to screen brightness adjustment. A voltage sensor detecting a level change of the high voltage; Screen width change correction according to brightness, characterized in that the vertical screen width correction unit for correcting the vertical width change of the screen by correcting the level of the PWM pulse applied to the vertical screen width control IC by the detection signal of the voltage sensing unit Circuit. 제1항에 있어서, 상기 전압 감지부는 화면의 밝기에 연동하여 변동하는 플라이 백 트랜스의 2 차측의 고압의 레벨 변동을 감지할 수 있도록 구성되어짐을 특징으로 하는 밝기에 따른 화면 폭 변화 보정회로.The screen width change correction circuit of claim 1, wherein the voltage detection unit is configured to detect a level change of the high voltage of the secondary side of the flyback transformer that changes in conjunction with the brightness of the screen. 제1항에 있어서, 상기 수직 화면 폭 보정부는 화면의 밝기가 밝아지면 화면의 수직 폭을 조절하기 위한 PWM펄스의 레벨을 상승시켜 보정할 수 있도록 함을 특징으로 하는 밝기에 따른 화면 폭 변화 보정회로.The screen width change correction circuit of claim 1, wherein the vertical screen width correction unit increases and corrects the level of the PWM pulse for adjusting the vertical width of the screen when the brightness of the screen becomes bright. . ※ 참고사항:최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950040084A 1995-11-07 1995-11-07 A correcting circuit of screen width KR0153349B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950040084A KR0153349B1 (en) 1995-11-07 1995-11-07 A correcting circuit of screen width

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950040084A KR0153349B1 (en) 1995-11-07 1995-11-07 A correcting circuit of screen width

Publications (2)

Publication Number Publication Date
KR970031784A true KR970031784A (en) 1997-06-26
KR0153349B1 KR0153349B1 (en) 1998-11-16

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ID=19433242

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950040084A KR0153349B1 (en) 1995-11-07 1995-11-07 A correcting circuit of screen width

Country Status (1)

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KR (1) KR0153349B1 (en)

Also Published As

Publication number Publication date
KR0153349B1 (en) 1998-11-16

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