KR910001469Y1 - Spot killer circuit for double scan digital tv - Google Patents

Spot killer circuit for double scan digital tv Download PDF

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Publication number
KR910001469Y1
KR910001469Y1 KR2019870010289U KR870010289U KR910001469Y1 KR 910001469 Y1 KR910001469 Y1 KR 910001469Y1 KR 2019870010289 U KR2019870010289 U KR 2019870010289U KR 870010289 U KR870010289 U KR 870010289U KR 910001469 Y1 KR910001469 Y1 KR 910001469Y1
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South Korea
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circuit
crt
scan digital
double scan
spot
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KR2019870010289U
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Korean (ko)
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KR890001744U (en
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박영준
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삼성전자 주식회사
안시환
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Priority to KR2019870010289U priority Critical patent/KR910001469Y1/en
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    • 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
    • H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
    • 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
    • H04N3/28—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical producing multiple scanning, i.e. using more than one spot at the same time

Abstract

내용 없음.No content.

Description

더블주사디지탈 TV의 스포트킬러회로Spot killer circuit of double scan digital TV

제1도는 본 고안 TV의 스포트킬러회로의 회로도.1 is a circuit diagram of a spot killer circuit of the present invention TV.

제2도는 본 고안 TV의 스포트컬러회로의 각부 파형도.2 is a waveform diagram of each part of the spot color circuit of the present invention TV.

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

가 : 에미터플로워회로 나 : 영상신호 CRT 구동회로A: Emitter follower circuit B: Video signal CRT driving circuit

다 : 브라운관 라 : 영상신호전류제거회로C: CRT D: Video signal current removal circuit

마 : 전원스위칭회로 Vcu : 더블주사디지탈의 비디오코덱유니트E: Power Switching Circuit Vcu: Video Codec Unit of Double Scan Digital

R1∼R9: 저항 TR1∼TR7: 트랜지스터R 1 to R 9 : Resistor TR 1 to TR 7 : Transistor

본 고안은 더블주사디지탈 TV의 스포트킬러회로에 관한것으로, 특히 TV의 전원오프시 잔여 전자비임에 의한 스포트를 없애주어 브라운관의 형광면 열화를 방지하기 위한 더블주사 디지탈 TV의 스포트컬러회로에 관한것이다.The present invention relates to a spot killer circuit of a double scan digital TV, and more particularly, to a spot color circuit of a double scan digital TV for eliminating spots caused by residual electron beams when the TV is powered off to prevent deterioration of fluorescent surface of the CRT.

종래의 통상의 Color TV의 스포트킬러회로는 정상동작중에는 브라운관의 그리드전압이 (-)로 인가되고 전원오프시 빠른방전이 이루어지도록 그리드전압(+) 이 되도록 하여 스포트를 없애주었으나 그러나 한순간에 많은 전류를 방전시키게 되므르 회로의 설계가 잘못되거나 편향전류가 없으면 브라운관이 타버리게 된다.The spot killer circuit of the conventional color TV eliminates spots by applying the grid voltage of the CRT to (-) during normal operation and becomes the grid voltage (+) so that a quick discharge occurs when the power is turned off. Discharge of current causes the CRT to burn out if the circuit design is incorrect or there is no deflection current.

그러므르 그리드에 높은(-)의 전압을 가해서 형광면으로 방사되는 비임의 양을 최대한으로 줄여주는 회로를 주로 채용하고 있으나 더블주사더지탈 TV에서 브라운관으로 최종 영상츨력을 내보내는 역할을 하는 비디오코덱유니트는 전원이 오프될때 영상출력으로 강한 백색출력이 나오게 되어 있어 그리드에 높은(-)의 전압을 가해주는 회로를 채용해도 브라운관 형광면에 백색스포트가 발생하는 현상을 막을 수 없는 결점을 가지고 있있다.The circuit is mainly adopted to reduce the amount of beam radiated to the fluorescent surface by applying a high voltage to the grid, but the video codec unit, which plays a role of outputting the final image output from the double scan digital TV to the CRT, When the power is turned off, a strong white output comes out as an image output, so even if a circuit that applies a high voltage to the grid has a drawback, white spots can not be prevented from occurring in the fluorescent tube of the CRT.

본 고안은 상기와 같은 결점을 해결하기 위하여 TV가 오프될때는 온 오프신호가 로우로 되는 것을 이용하여 전원이 오프될때 비디오코덱유니트 출력신호를 제거시켜 TV브라운관의 캐소우측으로 신호가 흘러 들어갈지 않도록하여 스포트가 발생되지 않도록 한 것으로, 이하 첨부된 도면에 의하여 본 고안을 상세히 실명하면 다음과 같다.The present invention eliminates the video codec unit output signal when the power is turned off by using the on-off signal is low when the TV is off to solve the above drawback so that the signal does not flow to the cathode side of the TV tube. In order to prevent the spot from occurring, the present invention will be described in detail with reference to the accompanying drawings as follows.

더블주사디지탈 TV의 비디오코덱유니트(Vcu)의 색상츨력단자(R) (G) (B)가 영상신호 CRT 구동회로(나)를 통하여 브라운관(다)의 케소우드단자(R) (G) (B)에 연결하여서 된 더블주사디지탈TV의 스포트킬러회로에 있어서, 상기 TV의 비디오코덱유니트(Vcu)의 색상출력단자(R) (G) (B)는 저항(R1∼R6)및 트랜지스터(TR1) (TR2) (TR3)루 구성된 에미터플로워회로(가)를 통하여 상기 영상신호 CRT 구동회로(나)에 연결함과 아울러 트렌지스터(TR4) (TR5) (TR6)로 구성된 영상신호전류제거회로(라)를 통하여 저항(R7) (R8) (R9) 트랜지스터(TR7)로 구성된 전원스위칭회로(마)에 연결하여 된 것으로 상기와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.The color output terminal (R) (G) (B) of the video codec unit (Vcu) of the double scan digital TV is connected to the cathode terminal (R) (G) of the CRT through the video signal CRT driving circuit (B). In the spot killer circuit of a double scan digital TV connected to B), the color output terminals R (G) (B) of the video codec unit (Vcu) of the TV are resistors (R 1 to R 6 ) and a transistor. (TR 1 ) (TR 2 ) (TR 3 ) and the transistor (TR 4 ) (TR 5 ) (TR 6 ) The power supply switching circuit (e) consisting of a resistor (R 7 ) (R 8 ) (R 9 ) and a transistor (TR 7 ) is connected through an image signal current removal circuit (D) consisting of The following describes the working effect.

먼저 회로에 전원을 인가하면 더블주사디지탈 TV의 비디오코덱유니트(Vcu)의 색상출력단자(R) (G) (B)에서는 정상상태에서 제2도의(a)에 도시한 바와같은 초기 파형이 나오게 된다.When power is applied to the circuit first, the color output terminal R (G) (B) of the video codec unit (Vcu) of the double scan digital TV produces an initial waveform as shown in FIG. do.

이 신호는 영상신호 CRT 구동회로(나)에 입력되어 플라이백트랜스에서 정류된 DC180V정드의 전압으르 구동되이 브라운관(다)의 케소우드로 들어가게 되는바 상기와 같은 상태에서 보통의 스포트킬러회로는 전원이 오프되면 브라운관(다)의 그리드에(-)전압을 가해주는 회로를 부가하여 케소우드에 남은 잔여 파형에 따른전류를 억제하여 화면에 스포트가 생기는 것을 방지하는 것이다.This signal is inputted to the video signal CRT driving circuit (B) and driven to the cathode of the CRT by driving the DC180V voltage rectified in the flyback transformer. When this is off, a circuit is applied to the grid of the CRT to suppress the current according to the remaining waveforms in the cathode to prevent spots on the screen.

그러나 더를주사디지탈 TV 비디오코덱유니트(Vcu)의 출력에서는 전원오프시에 제2도의(a)에 도시한 바와같이 12V P-P 달하는 신호가 발생되어 브라운관(다)의 케소우드에 커다란 역전압이 생겨 그리드에(-)전압을 가해 전자방출을 억제하는 상기와 같은 스포트킬러회로는 스포트를 없앨수 없다.However, at the output of the scan digital TV video codec unit (Vcu), when the power is turned off, a signal reaching 12V PP is generated as shown in Fig. 2 (a), and a large reverse voltage is generated in the cathode of the CRT. The spot killer circuit which suppresses electron emission by applying a negative voltage to the grid cannot eliminate spots.

그러므로 전원오프시에 전원스위칭회로(마)에 로우신호가 인가되게 되므로 트랜지스터(TR7)는 오프되므로트랜지스터(TR7)의 콜렉터단자에는 제2도의(a)에 도시한 바와같이 대기전원이 걸리게 되고 이 대기전원은 저항(R8)을 통하여 영상신호전류체거회로(라)의 트랜지스터(TF4) (TR5) (TR6)의 베이스단자에 인가되게 되므로 트랜지스터(TR4)(TR5)(TR6)는 온 되게 되어 더블주사디지탈 TV의 비디오코덱트유니트(Vcu)에서 출력된 전압은 트랜지스터 (TR4) (TR5) (TR6)를 통하여 흘러나가게 됨으로 제2도의(b)에 도시한 바와같아 0V로 떨어지게된다.Therefore, since the low signal is applied to the power switching circuit (E) when the power is turned off, the transistor TR 7 is turned off, so that the collector terminal of the transistor TR 7 is supplied with standby power as shown in FIG. The standby power is applied to the base terminal of the transistors TF 4 (TR 5 ) (TR 6 ) of the image signal current blocking circuit D through the resistor R 8 , so that the transistors TR 4 (TR 5 ). (TR 6 ) is turned on so that the voltage output from the video codec unit (Vcu) of the double scan digital TV flows out through the transistors (TR 4 ) (TR 5 ) (TR 6 ). As shown, it drops to 0V.

따라서 상기 에미터플로워회로(가)의 트랜지스터(TR1) (TR2) (TR3)는 온 되게되어 전원전압은 저항(R4) (R5) (R6)을 통하여 트랜지스터(TR1) (TR2) (TR3)로 흘러나가게 되므로, 브라운관(다)의 케소우드전압은 영상신호CRT 구동회로(나)에서 가해주는 전원전압을 유지하게 되어 그리드에 비해 상대적으로 높은(＋)바이어스전압이 걸려 잔여전자가 그리드를 통과하지 못하므로 브라운관(다)의 형광면에 스포트 현상이 일어나지 않게 되는것 이다.Accordingly, the transistors TR 1 (TR 2 ) (TR 3 ) of the emitter follower circuit A are turned on so that the power supply voltage is transistors TR 1 through the resistors R 4 (R 5 ) (R 6 ). Since it flows to (TR 2 ) and (TR 3 ), the cathode voltage of the CRT maintains the power supply voltage applied by the video signal CRT driving circuit (B), so that it is relatively high (+) bias voltage compared to the grid. This prevents the residual electrons from passing through the grid, so spots do not occur on the fluorescent surface of the CRT.

이상에서 설명한 바와같이 본 고안은 더블주사디지탈 TV의 비디오코덱유니트에서 나오는 출력단자에 에미터플로워회로 및 영상신호전류제거회로 전원스위칭회로를 연결하여 전원을 오프할때 브라운관의 케소우드 전압을 높여서 잔여전자가 그리드를 통과하진 못하게 하여 형광편에 스포트현상이 나타나지 않게함으로써 브라운관의 형관면을 보흐할 수 있는 이점을 제공해줄 수 있는 것이다.As described above, the present invention is connected to the output terminal of the video codec unit of the double scan digital TV by connecting the emitter follower circuit and the video signal current removing circuit power switching circuit to increase the cathode voltage of the CRT when the power is turned off. By preventing electrons from passing through the grid, spots do not appear on the fluorescent plate, which can provide the advantage of bouncing the tubular surface of the CRT.

Claims (1)

더블주사디지탈 TV의 비디오코덱유니트(Vcu)의 색상출력단자(R) (G) (B)가 영상신호 CRT 구동회로(나)를 통하여 브라운관(다)의 케소우드단자(R) (G) (B)에 연결하여서 된 더블주사디지탈 TV의 스포트킬러회로에 있어서, 상기 비디오코덱유니트(Vcu)의 색상출럭단자(R) (G) (B)는 저항(R1~R6) 트랜지스터(TR1∼TR3)로 구성된 에미터플로워회로(가)를 통하여 상기 영상신호 CRT 구동회로(나)를 연결함과 아울러 트랜The color output terminal (R) (G) (B) of the video codec unit (Vcu) of the double scan digital TV is the cathode terminal (R) (G) of the CRT (C) through the video signal CRT driving circuit (B). In the spot-killer circuit of a double scan digital TV connected to B), the color output terminals R (G) (B) of the video codec unit (Vcu) are resistors (R 1 to R 6 ) transistors (TR 1). The image signal CRT driving circuit (b) through the emitter follower (a) composed of ˜TR 3 ) 지스터(TR4∼TR6)로 구성된 영상신호전류제거회로(라)를 통하여 저항(R7∼R9) 트랜지스터(TR7)로 구성된 전원스위칭회로(마)를 연결하여 브라운관에 스포트를 게거할 수 있게 구성한 것을 특징으로 하는 더블주사디지탈 TV의 스포트킬러회로.Spot the spot on the CRT by connecting a power supply switching circuit (e) consisting of resistors (R 7 to R 9 ) and transistor (TR 7 ) through an image signal current removal circuit (e) consisting of jitters (TR 4 to TR 6 ). The spot killer circuit of the double scan digital TV characterized by the above-mentioned.
KR2019870010289U 1987-06-26 1987-06-26 Spot killer circuit for double scan digital tv KR910001469Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019870010289U KR910001469Y1 (en) 1987-06-26 1987-06-26 Spot killer circuit for double scan digital tv

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Application Number Priority Date Filing Date Title
KR2019870010289U KR910001469Y1 (en) 1987-06-26 1987-06-26 Spot killer circuit for double scan digital tv

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KR890001744U KR890001744U (en) 1989-03-20
KR910001469Y1 true KR910001469Y1 (en) 1991-03-04

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