KR910004405Y1 - Luminance signal control circuit - Google Patents

Luminance signal control circuit Download PDF

Info

Publication number
KR910004405Y1
KR910004405Y1 KR2019880002171U KR880002171U KR910004405Y1 KR 910004405 Y1 KR910004405 Y1 KR 910004405Y1 KR 2019880002171 U KR2019880002171 U KR 2019880002171U KR 880002171 U KR880002171 U KR 880002171U KR 910004405 Y1 KR910004405 Y1 KR 910004405Y1
Authority
KR
South Korea
Prior art keywords
color
ray tube
cathode ray
control circuit
resistor
Prior art date
Application number
KR2019880002171U
Other languages
Korean (ko)
Other versions
KR890018391U (en
Inventor
명현성
Original Assignee
주식회사 금성사
최근선
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 금성사, 최근선 filed Critical 주식회사 금성사
Priority to KR2019880002171U priority Critical patent/KR910004405Y1/en
Publication of KR890018391U publication Critical patent/KR890018391U/en
Application granted granted Critical
Publication of KR910004405Y1 publication Critical patent/KR910004405Y1/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/002—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

내용 없음.No content.

Description

휘도조절회로Luminance control circuit

제 1 도는 종래의 휘도조절회로도.1 is a conventional luminance control circuit diagram.

제 2 도는 본 고안의 휘도조절회로도.2 is a luminance control circuit diagram of the present invention.

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

11, 21, 31 : 증폭기 12, 22, 32 : 바이어스조정부11, 21, 31: amplifier 12, 22, 32: bias adjustment unit

4 : 음극선관 6 : 휘도조정부4: cathode ray tube 6: luminance adjustment part

본 고안의 칼러 모니터의 휘도조절회로에 관한 것으로, 특히 고해상도 아날로그 그래픽 모니터에 적당하도록 어두운 부분에서의 백색평형(White Balance)특성을 대폭 개선한 위도조절회로에 관한 것이다.The present invention relates to a luminance control circuit of a color monitor of the present invention, and more particularly, to a latitude control circuit that greatly improves a white balance characteristic in a dark area to be suitable for a high resolution analog graphic monitor.

종래의 휘도조절회로는 제 1 도의 도시된 바와같이, 적색, 녹색, 청색신호단자(R), (G), (B)는 증폭기(11), (21), (31) 및 결합용콘덴서(C11), (C21), (C31) 바이어스조정부(12), (22), (32)를 통해 음극선관(4)의 적색, 녹색, 청색캐소드(RK), (GK), (BK)에 접속되고, 상기 바이어스조정부(12, 22, 32)에 트랜지스터(TR1)의 콜렉터가 공통접속되고, 상기 음극선관(4)의 제1그리드(G1)에 휘도조정부(5)가 접속된 구조로 되어있다.In the conventional luminance control circuit, as shown in FIG. 1, the red, green, and blue signal terminals R, G, and B are amplifiers 11, 21, 31, and a coupling capacitor. C 11 ), (C 21 ), (C 31 ) Red, green, blue cathodes (RK), (GK), (BK) of cathode ray tube (4) via bias adjuster (12), (22), (32) ), A collector of the transistor TR 1 is commonly connected to the bias adjustment units 12, 22, and 32, and a brightness adjustment unit 5 is connected to the first grid G 1 of the cathode ray tube 4. Structure.

따라서, 이러한 종래의 회로는 각색신호단자(R, G, B)의 각 신호가 증폭기(11, 21, 31)에서 증폭되고 결합용콘덴서(C11, C21, C31)에서 결합된 후 바이어스조정부(12, 22, 32)에서 바이어스가 조정되어 음극선관(4)의 각색캐소드(RK, GK, BK)에 인가된다. 즉, 수평귀선기간중 클램프펄스(CP)를 트랜지스터 (TR1)의 베이스에 인가하여 그를 도통시키면, 영상신호의 직류성분을 나타내는 흑레벨은 전압(VCC2)을 바이어스 조정부(12, 22, 32)의 저항(R12R22R32) 및 가변저항(VR11,VR21, VR31)에 의해 분압한 전압에 클램프된다. 이와 같이 수평귀선시간중에 영상신호는 흑레벨(가장 어두운 레벨)이 되므로 실제로 바이어스조정부(12, 22, 32)의 가변저항(VR11, VR21, VR31)의 분압비율을 조정하으로써 흑레벨에서의 각색합성색이 백색이 되도록 조정할 수 있게된다.Therefore, this conventional circuit is biased after each signal of the color signal terminals (R, G, B) is amplified in the amplifiers (11, 21, 31) and combined in the coupling capacitor (C 11 , C 21 , C 31 ). The bias is adjusted in the adjusting units 12, 22, 32 and applied to the respective color cathodes RK, GK, BK of the cathode ray tube 4. In other words, when the clamp pulse CP is applied to the base of the transistor TR 1 and conducts during the horizontal retrace period, the black level representing the direct current component of the video signal causes the voltage V CC2 to be biased. Clamped to a voltage divided by the resistors R 12 R 22 R 32 and the variable resistors VR 11, VR 21 , VR 31 . In this way, the video signal becomes the black level (the darkest level) during the horizontal retrace time, so that the black level is actually adjusted by adjusting the partial pressure ratio of the variable resistors VR 11 , VR 21 , VR 31 of the bias adjusters 12, 22, 32. It is possible to adjust the color composite color in to be white.

또, 상기 각색신호단자(R, G, B)의 각색신호가 상기에서 설정한 흑레벨을 기준으로 하여 밝은 백레벨로 이동하더라도 각 증폭기(11, 21, 31)의 이득의 적절히 조정하면, 백레벨에서도 각색신호합성색이 정확히 백색을 유지할 수 있게된다.Further, even if the respective color signals of the respective color signal terminals R, G, and B move to the bright white level based on the black level set above, if the gains of the respective amplifiers 11, 21, 31 are properly adjusted, Even at the level, the color signal synthesis color can be maintained exactly white.

이와같이 어두운 흑레벨에서나 밝은 백레벨에서 각 색신호의 합성색이 백색이 유지되도록 하는 것을 백색평형이라 하며, 칼라 모니터의 중요한 특성이다.White balance is such that the composite color of each color signal is maintained at a dark black level or a bright white level. This is an important characteristic of a color monitor.

한편, 상기와같은 상황에서 휘도조절부(5)의 가변저항(VR1)조정하여 음극선관(4)의 제1그리드(G1)에 인가되는 전압을 조정하게 되면 그 음극선관(4)의 각색캐소드(RK, GK, BK)와 제1그리드(G1)사이의 전압이 변화하여 화면전체 밝기가 조정된다. 즉, 휘도조정부(5)의 가변저항(VR1)을 조절하여 화면의 휘도를 조정할수 있게된다.Meanwhile, when the voltage applied to the first grid G 1 of the cathode ray tube 4 is adjusted by adjusting the variable resistance VR 1 of the luminance adjusting unit 5 in the above situation, the cathode ray tube 4 of the cathode ray tube 4 is adjusted. The overall brightness of the screen is adjusted by changing the voltage between the color cathodes RK, GK, BK and the first grid G 1 . That is, the brightness of the screen can be adjusted by adjusting the variable resistor VR 1 of the brightness adjusting unit 5.

그러나, 이러한 종래의 회로에 있어서는 휘도를 조절하기 위하여 음극선관의 제1그리드에 인가되는 전압을 조정함에 따라 각색신호의 흑레벨(기준레벨)의 전압을 동일한 전압으로 이동시키는 것이 되므로 상기에서 설명한 흑레벨에서의 바이어스 조정에 의해 백색평형이 무너지게 되어 휘도조절에 따른 화면색상이 미세하게 변하게 되며, 이러한 현상은 특히 흑레벨부근에서 심하게 나타나게 되므로 백색평형이 엄격하게 요구되는 아날로그 입력방식의 고해상도 칼러 모니터에 적용할 수 없는 문제점이 있었다.However, in such a conventional circuit, since the voltage applied to the first grid of the cathode ray tube is adjusted to adjust the luminance, the voltage of the black level (reference level) of each color signal is shifted to the same voltage. The white balance is collapsed by the bias adjustment at the level, and the color of the screen is slightly changed due to the brightness control. This phenomenon is particularly severe near the black level, so the high resolution color monitor of the analog input method that strictly requires the white balance is required. There was an issue that could not be applied to.

본 고안은 이러한 종래의 결점을 해결하기 위하여, 음극선관의 제1그리드에 인가되는 전압을 일정하게 고정시켜두고, 바이어스조정부에 인가되는 전압을 조정함으로써 휘도가 조절되어 백색평형이 무너지지 않게 안출한 것으로, 이를 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다.In order to solve the above-mentioned drawbacks, the present invention is to fix the voltage applied to the first grid of the cathode ray tube and to adjust the voltage applied to the bias adjustment unit so that the brightness is adjusted so that the white balance does not fall down. This will be described in detail with reference to the accompanying drawings.

제 2 도는 본 고안은 휘도조절회로도로서 이에 도시한 바와 같이 적색, 녹색, 청색신호단자(R, G, B)의 각색신호가 증폭기(11, 21, 31)에서 각각 증폭되고 결합용콘덴서(C11, C21, C31)에서 각각 결합된 후 클림프트랜지스터(TR1)의 구동제어를 받는 바이어스조정부(12, 22, 23)에서 각각 바이어스조정되어 음극선관(4)의 각색캐소드(RK, GK, BK)에 인가되게 한 칼러 모니터회로에 있어서, 전원단자(Vcc3)를 저항(R1)을 통해 상기 음극선관(4)의 제1그리드(G1)에 접속하고, 전원단자(VCC2)를 트랜지스터(TR2)의 콜렉터에 접속함과 아울러 가변저항(VR2)을 통해 저항(R2)에 접속하며, 상기 가변저항(VR2)의 가변단자를 저항(R3)을 통해 콘덴서(C2) 및 상기 트랜지스터(TR2)의 베이스에 접속하여 휘도조정부(6)를 구성하고, 이 휘도조정부의 에미터 및 콘덴서(C3)의 접속점을 상기 바이어스조정부(12, 22, 32)의 전원입력측에 공통접속하여 구성한 것으로, 이와같이 구성된 본 고안의 작용효과를 상세히 설명하면 다음과 같다.2 is a luminance control circuit diagram. As shown in FIG. 2, the respective signals of the red, green, and blue signal terminals R, G, and B are amplified by the amplifiers 11, 21, and 31, and the coupling capacitor C is shown. 11 , C 21 , and C 31 , respectively, and are biased in the bias adjusting units 12, 22, and 23 under the driving control of the crimp transistor TR 1 to adjust the color cathodes of the cathode ray tube 4 (RK, GK). In the color monitor circuit applied to the BK, the power supply terminal Vcc 3 is connected to the first grid G 1 of the cathode ray tube 4 through a resistor R 1 , and the power supply terminal V CC2. ) the capacitor a variable terminal of the transistor (TR 2), and connected to the resistance (R 2) also as well as connected to the collector via a variable resistor (VR 2) of the variable resistor (VR 2) via a resistor (R 3) (C 2 ) and the base of the transistor TR 2 are connected to form a brightness adjusting section 6, and the emitter and the capacitor C 3 of the brightness adjusting section are connected. The point is configured to be connected in common to the power input side of the bias adjustment unit 12, 22, 32, and described in detail the operation and effect of the present invention configured as described above.

수평귀선기간중에 클램프펄스(CP)를 트랜지스터(TR1)의 베이스에 인가하여 그를 도통시키면, 영상신호의 직류성분을 나타내는 흑레벨은 상기의 제 1 도 설명에서와 같이 바이어스조정부(12, 22, 32)에 의해 클램프되고, 흑레벨에서의 각색합성색이 백색이 되도록 조정할 수 있게된다.When the clamp pulse CP is applied to the base of the transistor TR 1 and conducts during the horizontal retrace period, the black level representing the direct current component of the video signal is equal to the bias adjustment unit 12, 22, as described in FIG. It is clamped by 32), and it is possible to adjust the color composite color at the black level to be white.

그리고, 이때 전원단자(Vcc2)의 전압은 휘도조정부(6)의 가변저항(VR2) 및 저항(R3)을 통해 트랜지스터(TR2)의 베이스에 인가되므로 그 가변저항(VR2)의 가변상태에 비례한 전압이 그 휘도조정부(6)의 출력측인 트랜지스터(TR2)의 에미터에 출력되어 바이어스조정부(12, 22, 32)의 전원입력측에 공통인가된다.At this time, the voltage of the power supply terminal Vcc 2 is applied to the base of the transistor TR 2 through the variable resistor VR 2 and the resistor R 3 of the luminance adjusting unit 6, and thus, the voltage of the variable resistor VR 2 . A voltage proportional to the variable state is output to the emitter of the transistor TR 2 , which is the output side of the luminance adjusting unit 6, and is commonly applied to the power input side of the bias adjusting units 12, 22, and 32.

이와같이 휘도조정부(6)의 출력전압이 가변저항(VR2)의 가변상태에 따라 변화되더라도 바이어스조정부(12, 22, 32)의 가변저항(VR11, VR21, VR31)에 의해 설정된 전압비율은 일정하게 유지된 상태에서 각 색신호의 흑레벨이 비례적으로 이동되어 휘도조정이 조정될 수 있게된다.In this way, even if the output voltage of the luminance adjusting unit 6 changes according to the variable state of the variable resistor VR 2 , the voltage ratio set by the variable resistors VR 11 , VR 21 , VR 31 of the bias adjusting units 12, 22, 32. In this state, the black level of each color signal is proportionally shifted so that the brightness adjustment can be adjusted.

따라서, 이때 백색평형은 휘도조정부(6)의 출력전압에 상관없이 유지되어진다.Therefore, at this time, the white balance is maintained regardless of the output voltage of the brightness adjusting section 6.

이상에서 상세히 설명한 바와같이 본 고안은 음극선관의 제1그리드에 인가되는 전압은 일정하게 고정시켜두고, 바이어스조정부에 인가되는 전압을 변화시켜 휘도를 조절하게 되므로 백색평형이 유지된 상태에서 휘도조절이 가능하게 되고, 이에따라 백색평형이 엄격하게 요구되는 아날로그입력방식의 고해상도 칼러모니터에 적용할 수 있는 이점이 있게된다.As described in detail above, the present invention maintains a constant voltage applied to the first grid of the cathode ray tube, and adjusts the luminance by changing the voltage applied to the bias adjustment unit, thereby adjusting luminance in a state where white balance is maintained. Therefore, there is an advantage that can be applied to a high resolution color monitor of the analog input method that strictly requires white balance.

Claims (1)

각색신호단자(R, G, B)의 색신호가 증폭기(11, 21, 31)에서 각각 증폭되고 결합용콘덴서(C11, C21, C31)에서 각각 결합된 후 클램프트랜지스터(TR1)의 구동제어를 받는 바이어스조정부(12, 22, 32)에서 각각 바이어스 조정되어 음극선관(4)의 각색캐소드(RK, BK, GK)에 인가되게 한 칼러 모니터회로에 있어서, 전원단자(Vcc3)를 저항(R1)을 통해 상기 음극선관(4)의 제1그리드(G1)에 접속하고, 전원단자(Vcc2)를 트랜지스터(TR2)의 콜렉터에 접속함과 아울러 가변저항(VR2)의 가변단자 및 저항(R1)을 통해 그의 베이스 및 콘덴서(C2)에 접속하고, 이 트랜지스터(TR2)의 에미터측을 상기 바이어스조정부(12, 22, 32)의 전원입력측에 공통접속하여 구성된 것을 특징으로 하는 휘도조절회로.The color signals of the respective color signal terminals R, G, and B are amplified by the amplifiers 11, 21, and 31, respectively, and are combined by the coupling capacitors C 11 , C 21 , and C 31 , respectively, and then the clamp transistors TR 1 In the color monitor circuit which is biased by the bias adjusting units 12, 22 and 32 subjected to the driving control to be applied to the respective color cathodes RK, BK and GK of the cathode ray tube 4, the power supply terminal Vcc 3 is connected. The resistor R 1 is connected to the first grid G1 of the cathode ray tube 4, the power supply terminal Vcc 2 is connected to the collector of the transistor TR 2 , and the variable resistor VR 2 is connected. Connected to its base and capacitor C 2 via a variable terminal and a resistor R 1 , and the emitter side of this transistor TR 2 is connected in common to the power input side of the bias adjustment unit 12, 22, 32. A brightness control circuit, characterized in that.
KR2019880002171U 1988-02-15 1988-02-15 Luminance signal control circuit KR910004405Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019880002171U KR910004405Y1 (en) 1988-02-15 1988-02-15 Luminance signal control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019880002171U KR910004405Y1 (en) 1988-02-15 1988-02-15 Luminance signal control circuit

Publications (2)

Publication Number Publication Date
KR890018391U KR890018391U (en) 1989-09-09
KR910004405Y1 true KR910004405Y1 (en) 1991-06-29

Family

ID=19272580

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019880002171U KR910004405Y1 (en) 1988-02-15 1988-02-15 Luminance signal control circuit

Country Status (1)

Country Link
KR (1) KR910004405Y1 (en)

Also Published As

Publication number Publication date
KR890018391U (en) 1989-09-09

Similar Documents

Publication Publication Date Title
US6778182B2 (en) Display device
US4451849A (en) Plural operating mode ambient light responsive television picture control
US5003394A (en) Dynamic video system including automatic contrast and "white-stretch" processing sections
NL194570C (en) Color television receiver.
US4298885A (en) Luminance control circuit for a television receiver
US4686562A (en) Gamma correction circuit
US4285008A (en) Color picture reproducing device
KR910009882B1 (en) Video signal processing system
US4081838A (en) Contrast control circuitry for a video processing system
KR950006235B1 (en) Brightness control circuit for a television receiver
KR910004405Y1 (en) Luminance signal control circuit
FI76465C (en) SIGNALBEHANDLINGSANORDNING.
US4489344A (en) Signal processing unit
CA1136755A (en) Predictably biased kinescope driver arrangement in a video signal processing system
JPH0124393B2 (en)
US4241362A (en) Circuit for increasing a signal slope of a periodically occurring signal mainly near a reference level
KR870003024Y1 (en) Image amplification circuit of a color monitor
US3967312A (en) Color television chroma demodulator circuit
KR900003545Y1 (en) Auto control circuit of brightness
KR940003513Y1 (en) White balance compensator for tv monitor
KR910007196Y1 (en) Brightness correction circuit
KR960016850B1 (en) Apparatus for automatically controlling color in tv set
JPH0622329A (en) Color video display element drive circuit, color video display device and video signal processing circuit
JP2583974B2 (en) Video output circuit with white balance correction circuit
KR910007545B1 (en) Brightness limitation circuit

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
REGI Registration of establishment
FPAY Annual fee payment

Payment date: 19981216

Year of fee payment: 9

LAPS Lapse due to unpaid annual fee