KR910004793Y1 - Automatic beam control circuit - Google Patents

Automatic beam control circuit Download PDF

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Publication number
KR910004793Y1
KR910004793Y1 KR2019870023443U KR870023443U KR910004793Y1 KR 910004793 Y1 KR910004793 Y1 KR 910004793Y1 KR 2019870023443 U KR2019870023443 U KR 2019870023443U KR 870023443 U KR870023443 U KR 870023443U KR 910004793 Y1 KR910004793 Y1 KR 910004793Y1
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KR
South Korea
Prior art keywords
beam current
brightness
screen
gain control
voltage
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KR2019870023443U
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Korean (ko)
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KR890015378U (en
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윤경하
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삼성전자주식회사
안시환
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Priority to KR2019870023443U priority Critical patent/KR910004793Y1/en
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    • 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
    • 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
    • H04N5/52—Automatic gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)

Abstract

내용 없음.No content.

Description

칼라텔레비젼의 화면밝기 자동조절회로Color TV automatic brightness adjustment circuit

제 1 도는 종래기술에 따른 칼라텔레비젼의 화면밝기 조절회로도.1 is a screen brightness adjustment circuit of a color television according to the prior art.

제 2 도는 본 고안에 따른 화면밝기 자동조절 회로도이다.2 is a circuit diagram for automatically adjusting the screen brightness according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 비임전류 공급회로부 20 : 가변범위(밝기)자동제어회로부10: beam current supply circuit portion 20: variable range (brightness) automatic control circuit portion

ZD1: 제너다이오드 VR1: 밝기범위 수동 조절용 가변저항ZD 1 : Zener Diode VR 1 : Variable resistor for manual adjustment of brightness range

VR2: 화면밝기의 기준전압 조절용저항 CRT : 브라운관VR 2 : Resistor for adjusting reference voltage of screen brightness CRT: CRT

AMP : 영상증폭기 FBT : 플라이백 트랜스포머AMP: Image Amplifier FBT: Flyback Transformer

본 고안은 칼라텔레비젼의 화면밝기를 조정하기 위한 회로에 관한 것으로서, 특히 칼라텔레비젼의 캐소오드레이 튜브(CRT)의 비임(Beam Current) 한계내에서 화면의 밝기를 자동으로 조정하기 위한 칼라텔레비젼의 화면밝기 자동조절회로에 관한 것이다.The present invention relates to a circuit for adjusting the screen brightness of a color television, and in particular, a screen of a color television for automatically adjusting the brightness of a screen within a beam current limit of a cathode ray tube (CRT) of a color television. The automatic brightness control circuit.

칼라텔레비젼의 화면밝기를 조절하기 위한 종래의 회로도는 제 1 도에 도시한 바와같이 전원(Vcc)은 저항(R1, R2)을 통해 영상증폭기(AMP)의 이득제어단자(CTL)로 입력되는바, 이때 영상증폭기(AMP)의 이득레벨은 가변저항(VR1)으로 화면의 밝기를 수동으로 사용자가 조정토록 되어 있다. 또, 화면밝기의 범위(VR1의 가변범위)를 가변저항(VR2)으로 조정하게 되고, 이때 저항(R4, R5)을 통해 흐르는 비임전류는 영상증폭기(AMP)의 제어전압(CTL의 전압)이 가변저항(VR1)에 의해 변할때마다 비임전류의 양도 변화된다.In the conventional circuit diagram for adjusting the screen brightness of a color television, as shown in FIG. 1, the power supply Vcc is input to the gain control terminal CTL of the image amplifier AMP through the resistors R 1 and R 2 . In this case, the gain level of the image amplifier AMP is controlled by the user to manually adjust the brightness of the screen with the variable resistor VR 1 . In addition, the range of the screen brightness (variable range of VR 1 ) is adjusted by the variable resistor VR 2 , where the beam current flowing through the resistors R 4 and R 5 is the control voltage CTL of the image amplifier AMP. The amount of beam current is also changed whenever the voltage) is changed by the variable resistor VR 1 .

예컨대 영상증폭기(AMP)의 이득제어단자(CTL)의 전압이 로우상태이면 저항(R5)을 통해 흐르는 비임전류는 증가하고, 저항(R4)을 통해 흐르는 비임전류는 감소하게 된다. 따라서 저항(R4)을 통한 비임전류가 감소하여 화면이 어두어지는 반면에 저항(R4)을 통해 흐르는 비임전류가 증가하면 화면은 밝아지게 된다.For example, when the voltage of the gain control terminal CTL of the image amplifier AMP is low, the beam current flowing through the resistor R 5 increases and the beam current flowing through the resistor R 4 decreases. Therefore, if the resistance (R 4) the beam current is reduced through the screen to the beam current increases that flows through the resistance (R 4) on the other hand eojineun dark display becomes brighter.

그러나, 이러한 종래의 회로에 있어서는 가변저항(VR1)의 가변범위(밝기의 범위)를 사용자가 가변저항(VR2)을 수동으로 조정함으로써 조정해야만 하는 불편함이 있었다.However, in such a conventional circuit, there is an inconvenience in that the user must adjust the variable range (range of brightness) of the variable resistor VR 1 by manually adjusting the variable resistor VR 2 .

따라서, 본 고안은 종래에서와 같이 가변저항(VR1)의 범위를 정하기 위해 강구된 가변저항(VR2)의 수동조정 방식을 삭제하고 제너다이오드의 블랙다운 전압특성을 이용하여 CRT의 비임전류 한계내에서 화면의 밝기를 자동적으로 조정함으로써 사용상의 편리함을 부여하기 위한 칼라텔레비젼의 화면밝기 자동조절회로를 제공하는데 그 목적이 있다.Therefore, the present invention eliminates the manual adjustment method of the variable resistor VR 2 , which is determined to determine the range of the variable resistor VR 1 as in the related art, and uses the blackdown voltage characteristic of the zener diode to limit the beam current of the CRT. It is an object of the present invention to provide a color television automatic brightness adjustment circuit for providing convenience in use by automatically adjusting the brightness of the screen within.

이하, 본 고안을 제 2 도에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to FIG. 2.

제 2 도는 본 고안에 따른 칼라텔레비젼의 화면밝기 자동조절 회로도인바, 전원단(Vcc)에는 저항(R7, R8) 및 다이오드(D3)로 구성된 비임전류 공급회로부(10)의 입력단을 연결하고, 상기 공급회로부(10)를 통하여 플라이백 트랜스포머(FBT)가 연결된 접속점(A)에는 저항(R9) 및 다이오드(D4), 제너다이오드(ZD1)로 가변범위 자동제어회로부(20)와 영상증폭기(AMP)의 이득제어단자(CTL)를 연결 구성하고, 영상증폭기(AMP)의 출력단과 플라이백 트랜스포머(FBT) 사이에는 브라운관(CRT)을 연결하여서 사용자의 조정없이 화면밝기를 자동으로 조정토록 한 것인바, 제 2 도중 미설명부호 R1, R2, R3는 영상증폭기(AMP)의 이득제어단자(CTL)에 대한 바이어스저항, R10은 비임전류의 공급저항, VR1은 사용자에 의한 밝기범위 조절용 가변저항을 각각 표시한다.2 is a circuit diagram for automatically adjusting the brightness of the color television according to the present invention, and the power terminal Vcc is connected to the input terminal of the beam current supply circuit unit 10 consisting of resistors R 7 and R 8 and a diode D 3 . The variable point automatic control circuit 20 includes a resistor R 9 , a diode D 4 , and a zener diode ZD 1 at a connection point A to which a flyback transformer FBT is connected through the supply circuit unit 10. And the gain control terminal (CTL) of the image amplifier (AMP) and the CRT between the output terminal of the image amplifier (AMP) and the flyback transformer (FBT). In the second step, reference numerals R 1 , R 2 , and R 3 denote bias resistors for the gain control terminal CTL of the image amplifier AMP, R 10 denotes the supply resistance of the beam current, and VR 1 denotes the Displays the variable resistance for brightness range adjustment by the user.

이와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.

먼저 전원(Vcc)은 비임전류 공급회로부(10)의 내부에 구성된 저항(R7, R8), 저항(R10) 및 플라이백 트랜스포머(FBT)를 통해 브라운관(CRT)으로 공급되는바, 영상증폭기(AMP)의 이득제어단자(CTL)의 전압이 증가할 경우 비임전류가 공급되지 못하도록 비임전류제어용 다이오드(D3)가 턴온되어 영상증폭기(AMP)의 이득제어단자(CTL)의 전압은 감소되어진다.First, the power supply Vcc is supplied to the CRT through the resistors R 7 and R 8 , the resistor R 10 , and the flyback transformer FBT configured in the beam current supply circuit unit 10. When the voltage of the gain control terminal CTL of the amplifier AMP increases, the beam current control diode D 3 is turned on so that the beam current cannot be supplied, so that the voltage of the gain control terminal CTL of the image amplifier AMP decreases. It is done.

다시말하면, 영상증폭기(AMP)의 이득제어단자(CTL)의 전압레벨이 높으면 영상신호의 이득이 증가되어 화면이 밝아지는바, 이때 저항(R7, R10)을 통과한 비임전류가 증가하여 플라이백 트랜스포머(FBT) 방향으로 흐르게 된다. 따라서 B점의 전압이 떨어지게 되어 다이오드(D3)가 턴온되고, 영상증폭기(AMP)의 이득제어단자(CTL)의 전위는 낮아지게 되어 영상증폭기(AMP)의 고 이득에 따라 과대하게 밝아졌던 화면의 밝기는 영상증폭기(AMP)의 이득제어단자(CTL)의 낮은 전위로 인해 다시 어두어진다.In other words, when the voltage level of the gain control terminal CTL of the image amplifier AMP is high, the gain of the image signal is increased to brighten the screen. At this time, the beam current passing through the resistors R 7 and R 10 increases. Flow in the direction of the flyback transformer (FBT). Therefore, the voltage at the point B drops so that the diode D 3 is turned on, and the potential of the gain control terminal CTL of the image amplifier AMP is lowered, resulting in an excessively bright screen according to the high gain of the image amplifier AMP. The brightness of is darkened again due to the low potential of the gain control terminal CTL of the image amplifier AMP.

이러한 과정은 반복적으로 수행됨으로써 영상증폭기(AMP)의 제어전압이 하이 또는 로우상태에 따라 화면의 밝기는 자동적으로 조절될 수 있다.Since the process is repeatedly performed, the brightness of the screen may be automatically adjusted as the control voltage of the image amplifier AMP is high or low.

한편, 저항(R9), 다이오드(D4) 및 제너다이오드(ZD1)로 구성된 가변범위 자동제어부(20)가 단락 또는 개방시에 밝기범위 조절용 제너다이오드(ZD1)가 과도한 비임전류를 제어하게 되고, 영상증폭기(AMP)에서 지정된 전압 즉, 밝기의 이득(즉, 사용자가 보고자하는 양호한 밝기의 화면)은 일종의 서브 브라이트(Sub-bright)역할을 하게된다. 이와같은 제너다이오드(ZD1)의 일정한 전압특성을 이용하여 영상증폭기(AMP)의 제어전압이 과대하게 변하는 범위를 자동으로 제어함으로써 별도의 수동작업이 필요없이 화면의 밝기를 자동으로 조절할수 있다.On the other hand, when the variable range automatic control unit 20 composed of the resistor R 9 , the diode D 4 and the zener diode ZD 1 short-circuits or opens, the zener diode ZD 1 for adjusting the brightness range controls excessive beam current. The voltage specified in the image amplifier AMP, that is, the gain of brightness (that is, the screen of good brightness that the user wants to see) serves as a kind of sub-bright. By using a constant voltage characteristic of the zener diode (ZD 1 ), the brightness of the screen can be automatically adjusted without the need for a manual operation by automatically controlling a range in which the control voltage of the image amplifier AMP is excessively changed.

이상에서와 같이 동작되는 본 고안은 비임전류 공급회로부와 제너다이오드를 이용한 가변범위 자동제어회로부를 구성하여 CRT의 비임전류 한계내에서 화면의 밝기를 자동적으로 조정하여 줄수 있는 특징을 지닌 것이다.The present invention, which operates as described above, has a feature that can automatically adjust the brightness of the screen within the beam current limit of the CRT by configuring a variable range automatic control circuit unit using a beam current supply circuit unit and a zener diode.

Claims (1)

저항(R1-R3) 및 가변저항(VR1)에 의해 설정된 이득제어전압에 의해 영상신호를 증폭하기 위한 영상증폭기(AMP)와, 플라이백 트랜스포머(FBT)로부터 발생된 고압에 의한 영상신호를 표시하는 CRT를 구비한 칼라텔레비젼의 화면밝기 자동조절회로에 있어서 : 상기 영상증폭기(AMP)의 이득제어전압이 높아 화면이 과대하게 높을 경우 상기의 플라이백 트랜스포머(FBT)에 가해지는 비임전류를 제어하기 위해 높은 이득제어전압에 의해 턴온되는 다이오드(D3)와 플라이백 트랜스포머(FBT)에 많은 비임전류를 제공하는 저항(R7, R8)으로된 비임전류 공급회로부(10)와 : 상기 영상증폭기(AMP)의 이득제어전압에 따른 밝기범위를 조절하는 제너다이오드(ZD1)와, 상기 제어다이오드 값에 의해 정해진 밝기범위를 상기 영상증폭기(AMP)의 이득제어전압에 영향을 주지 않고 제너다이오드(ZD1)에 의해 제어되는 전압을 일정하게 하기 위한 다이오드(D1) 및 상기 제너다이오드(ZD1)의 바이어스저항(R9)으로된 가변범위 자동제어회로부(20)로 구성시켜서됨을 특징으로 하는 칼라텔레비젼의 화면밝기 자동조절회로.A video amplifier AMP for amplifying the video signal by the gain control voltage set by the resistors R 1 -R 3 and the variable resistor VR 1 , and a video signal due to the high voltage generated from the flyback transformer FBT. A color television automatic adjustment circuit of a color television having a CRT for displaying: When the gain of the AMP is high and the screen is excessively high, a beam current applied to the flyback transformer (FBT) is applied. And a beam current supply circuit section 10 comprising resistors R 7 and R 8 which provide a large beam current to the diode D 3 and the flyback transformer FBT turned on by a high gain control voltage for controlling: not give the zener diode (ZD 1) and effects a predetermined brightness range by the control diodes value to the gain control voltage of the video amplifier (aMP) for adjusting the brightness range of the gain control voltage of the video amplifier (aMP) That by consist of a Zener diode (ZD 1) a diode (D 1) and a bias resistor (R 9) in the variable range automatic control circuit (20) of the zener diode (ZD 1) to a constant voltage which is controlled by the Color TV screen brightness automatic control circuit.
KR2019870023443U 1987-12-29 1987-12-29 Automatic beam control circuit KR910004793Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019870023443U KR910004793Y1 (en) 1987-12-29 1987-12-29 Automatic beam control circuit

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Application Number Priority Date Filing Date Title
KR2019870023443U KR910004793Y1 (en) 1987-12-29 1987-12-29 Automatic beam control circuit

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KR890015378U KR890015378U (en) 1989-08-12
KR910004793Y1 true KR910004793Y1 (en) 1991-07-04

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KR100429230B1 (en) * 2001-12-29 2004-04-29 엘지전자 주식회사 Apparatus for controlling brightness of a monitor

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