KR970002565Y1 - Modification circuit for a raster brightness in a multi mode monitor - Google Patents
Modification circuit for a raster brightness in a multi mode monitor Download PDFInfo
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- KR970002565Y1 KR970002565Y1 KR2019940020233U KR19940020233U KR970002565Y1 KR 970002565 Y1 KR970002565 Y1 KR 970002565Y1 KR 2019940020233 U KR2019940020233 U KR 2019940020233U KR 19940020233 U KR19940020233 U KR 19940020233U KR 970002565 Y1 KR970002565 Y1 KR 970002565Y1
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- 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
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- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
내용 없음.No content.
Description
제1도는 종래 다중모드 모니터의 라스터 밝기보정회로도.1 is a raster brightness correction circuit diagram of a conventional multi-mode monitor.
제2도는 본 고안 다중모드 모니터의 라스터 밝기보정회로도.2 is a raster brightness correction circuit of the present invention multi-mode monitor.
제3도는 본 고안 수평주파수에 따른 전압 특성을 나타낸 도면.3 is a diagram showing the voltage characteristics according to the present invention horizontal frequency.
제4도는 본 고안 비임전류에 따른 전압 특성을 나타낸 도면.4 is a view showing the voltage characteristics according to the present invention beam current.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 비임전류감지부 2 : 버퍼1: Beam current detection unit 2: Buffer
3,5 : 반전증폭부 4 : 주파수/전압변환부3,5: inverted amplifier 4: frequency / voltage converter
6 : 반전가산증폭부 7 : 뮤트부6: inverted amplification part 7: mute part
본 고안은 모니터의 라스터 밝기보정회로에 관한것으로, 특히 다중모드 모니터에 있어서 수평해상도및 화면의 밝기에 따라 라스터의 밝기가 변하는 것을 보정하고자 한것이다.The present invention relates to a raster brightness correction circuit of a monitor. In particular, a multi-mode monitor is intended to correct a change in the raster brightness according to the horizontal resolution and the screen brightness.
종래 라스터 밝기보정회로는 제1도에 도시된 바와같이 모니터의 내부 밝기조절을 위한 가변저항(VR31)과, 사용자가 저항값을 조정하여 모니터 외부 밝기조절을하는 가변저항(VR32)과, 뮤트신호를 입력받아 화면을 소거시키는 뮤트회로부(31)로 구성된다.Conventional raster brightness correction circuit has a variable resistor (VR31) for adjusting the internal brightness of the monitor as shown in Figure 1, a variable resistor (VR32) for adjusting the external brightness of the monitor by the user adjusts the resistance value, and mute It is composed of a mute circuit unit 31 for receiving a signal to erase the screen.
미 설명부호 R31∼R34는 저항, C31은 다이오드, Q31은 트랜지스터이다. 이와같이 구성된 종래 라스터 밝기보정회로는 양전원(Vcc)에서 전원이 인가되면 가변저항(VR31)의 저항값이 가변되어 내부 밝기 조절을 하고, 음전원(Vbb)에서 전원이 인가되면, 모니터 외부 사용자가 조정하여 밝기 조절을 하는 가변저항(VR32)의 저항값이 가변되어 모니터의 제어전극인 그리드단자(G1)에 인가되므로서, 그리드단자(G1)에 인가되는 전압을 조절하여 라스터 밝기조절을 하게 된다.Reference numerals R31 to R34 denote resistors, C31 denotes diodes, and Q31 denotes transistors. In the conventional raster brightness correction circuit configured as described above, when power is applied from the positive power supply Vcc, the resistance value of the variable resistor VR31 is changed to adjust the internal brightness, and when power is supplied from the negative power supply Vbb, The resistance value of the variable resistor VR32 for adjusting the brightness is variable and applied to the grid terminal G1, which is the control electrode of the monitor, so that the raster brightness is adjusted by adjusting the voltage applied to the grid terminal G1. do.
이때, 뮤트신호(M)가 뮤트회로부(31)의 트랜지스터(Q31)의 베이스에 입력되면 뮤트회로부(31)는 하이레벨이 되므로 다이오드(D31)의 양극쪽을 음전원(Vbb)에 가깝게 끌어내림으로서 콘덴서(C31)을 통하여 그리드단자(G1)에 블랭킹신호(BLK)을 인가 하므로서 화면이 보이지 않게 한다.At this time, when the mute signal M is input to the base of the transistor Q31 of the mute circuit section 31, the mute circuit section 31 is at a high level so that the anode side of the diode D31 is brought closer to the negative power supply Vbb. As a result, the blanking signal BLK is applied to the grid terminal G1 through the capacitor C31 so that the screen is not visible.
그러나, 종래 라스터 밝기보정회로는 사용자가 가변저항(VR32)을 조정하여 선택한 라스터 밝기는 제어전극인 그리드단자(G1)의 전위를 선택한 것이므로 항상 일정한 그리드단자(G1)의 전압을 유지하므로서, 모니터의 비임전류(Beam Current)가 증가 하게되면 모니터의 고압변화에 의해 라스터가 어두워지고, 또한 다중모드 모니터에서는 수평해상도가 변화에 따른 고압의 변화로 인하여 라스터의 밝기가 변하는등의 문제점이 있었다.However, in the conventional raster brightness correction circuit, since the raster brightness selected by the user by adjusting the variable resistor VR32 is selected by the potential of the grid terminal G1 as the control electrode, the voltage of the grid terminal G1 is always maintained. When the beam current of the monitor increases, the raster becomes dark due to the change of the high pressure of the monitor, and in the multi-mode monitor, the brightness of the raster changes due to the change of the high pressure due to the change of the horizontal resolution. there was.
본 고안은 이와같은 종래의 문제점을 해결하기 위하여 비임전류와 수평주파수에 의해 변화된 전압만큼 보정하여 주므러서, 항상 일정한 레벨의 라스터의 밝기를 유지할 수 있도록 한 것이다.In order to solve such a conventional problem, the present invention compensates for the voltage changed by the beam current and the horizontal frequency, so that the brightness of the raster of a constant level is always maintained.
본 고안의 구성은 제2도에 도시된 바와같이 모니터 내부의 밝기조정을 위한 가변저항(VR1)과, 외부의 밝기조정을 위한 가변저항(VR2)과, 비임전류(IB)를 감지하여 비임전류(IB)에 따른 전압을 출격하는 비임전류감지부(1)와, 상기 비임전류감지부(1)에서 출력되는 전압을 완충증폭하여 출력하는 버퍼(2)와, 상기 버퍼(2)에서 출력되는 전압을 반전증폭하여 출력하는 반전증폭부(3)와, 수평해상도에 따른 전압을 감지하여, 수평주파수(fH)에 따른 전압을 출력하는 주파수/전압변환부(4)와, 상기 주파수/전압변환부(4)에서 출력되는 전압을 반전증폭하여 출력하는 반전증폭부(5)와, 상기 가변저항(VR1, VR2)과 반전증폭부(3, 5)에서 출력되는 전압을 가산하고 반전증폭하여 그리드단자(G1)전압을 보정하는 반전가산증폭부(6)와, 뮤트신호(M)를 입력받아 화면을 소거시키는 뮤트부(7)로 구성된다.As shown in FIG. 2, the present invention has a variable resistor VR1 for adjusting brightness inside the monitor, a variable resistor VR2 for adjusting outside brightness, and a beam current IB for detecting a beam current. A beam current detection unit 1 for discharging the voltage according to IB, a buffer 2 for amplifying and outputting the voltage output from the beam current detection unit 1, and output from the buffer 2 An inverted amplifier 3 for inverting and outputting a voltage, a frequency / voltage converter 4 for sensing a voltage according to a horizontal resolution and outputting a voltage according to a horizontal frequency fH, and the frequency / voltage conversion The inverted amplifier 5 for inverting and amplifying the voltage output from the unit 4 and the voltages output from the variable resistors VR1 and VR2 and the inverted amplifiers 3 and 5 are added and inverted and amplified. Inverting and adding amplifier 6 for correcting terminal G1 voltage and muting signal M are inputted to erase the screen. It consists teubu 7.
그리고, 상기 반전증폭부(3)는 버퍼(2)에서 출력되는 전압을 차동증폭하는 차동증폭기(OP1)로 구성되고, 상기 반전증폭부(5)는 주파수/전압변환부(4)에서 출력되는 전압을 차동증폭하는 차동증폭기(OP2)로 구성되고, 상기 반전가산증폭부(6)는 가변저항(VR1, VR2)과 반전증폭부(3, 4)에서 출력되는 전압을 가산하여, 가산된전압을 차동증폭하는 차동증폭기(OP3)으로 구성된다.The inverting amplifier 3 includes a differential amplifier OP1 for differentially amplifying the voltage output from the buffer 2, and the inverting amplifier 5 is output from the frequency / voltage converter 4. A differential amplifier (OP2) for differentially amplifying a voltage, and the inverting and adding amplifier (6) adds the voltages output from the variable resistors (VR1, VR2) and the inverting amplifiers (3, 4) and adds the voltage. It consists of a differential amplifier (OP3) that differentially amplifies.
미 설명부호 R1∼R20은 저항, Q1, Q2는 트랜지스터, C1, C2는 콘덴서, D1∼D3는 다이오드이다.Reference numerals R1 to R20 are resistors, Q1 and Q2 are transistors, C1 and C2 are capacitors, and D1 to D3 are diodes.
이와같이 구성된 본 고안 다중모드 모니터의 라스터 밝기보정회로는 ABL(Automatic Beam Limit)회로인 비임전류감지부(1)에서 비임전류를 감지하여 제4도와 같은 비임전류(IB)가 증가함에 따른 전압이 출력되고, 상기 비임전류감지부(1)에서 출력된 전압이 버퍼(2)를 통하여 완충증폭되어 반전증폭부(3)의 차동증폭기(OPI)에 인가되면, 차동증폭기(OP1)의 출력전압은 비임전류(IB)가 증가하면 낮아지고 비임전류(IB)가 감소하면 증가하게 된다.The raster brightness correction circuit of the inventive multi-mode monitor configured as described above detects the beam current in the beam current detection unit 1, which is an ABL (Automatic Beam Limit) circuit, so that the voltage of the beam current (IB) as shown in FIG. 4 increases. When the voltage output from the beam current sensing unit 1 is buffered and amplified through the buffer 2 and applied to the differential amplifier OPI of the inverting amplifier 3, the output voltage of the differential amplifier OP1 is When the beam current IB increases, it decreases, and when the beam current IB decreases, it increases.
한편, 주파수/전압변환부(4)에서 수평주파수(fH)에 따른 전압을 출력하여 반전증폭부(5)의 차동증폭기(OP2)에 출력하면 차동증폭기(OP2)의 출력전압은 수평주파수(fH)가 증가하면 주파수/전압변환부(4)의 출력전압이 감소하게 되므로 증가하게되고, 수평주파수(fH)가 감소하면 주파수/전압변환부(4)의 출력전압은 증가하게 되므로 차등증폭기(OP2)의 출력전압은 감소하게 된다.Meanwhile, when the frequency / voltage converter 4 outputs a voltage according to the horizontal frequency fH and outputs the voltage to the differential amplifier OP2 of the inverting amplifier 5, the output voltage of the differential amplifier OP2 is the horizontal frequency fH. Increases, the output voltage of the frequency / voltage converter 4 decreases, and if the horizontal frequency fH decreases, the output voltage of the frequency / voltage converter 4 increases, so that the differential amplifier OP2 ) Output voltage decreases.
이후, 내부 밝기조절을 위한 가변저항(VR1)이 가변되여 설정된 전압과 외부에서 사용자가 조정하여 밝기조절을 하는 가변저항(VR2)이 가변되여 설정된 전압이 차동증폭기(OP1, OP2)에서 출력된 전압과 함께 차동증폭기(OP3)에 인가되면, 차동증폭기에서는 가변저항(VR1, VR2)에 의해 설정된 전압과 차동증폭기(OP1, OP2)에서 출력된 전압을 가산출력하여 그리드단자(G1)전압을 조절하게 된다.After that, the variable resistor VR1 for adjusting the internal brightness is variable, and the variable resistor VR2 for adjusting brightness by the user is variable, and the set voltage is output from the differential amplifiers OP1 and OP2. When applied to the differential amplifier OP3, the differential amplifier adds and outputs the voltage set by the variable resistors VR1 and VR2 and the voltages output from the differential amplifiers OP1 and OP2 to adjust the grid terminal G1 voltage. do.
이때, 비임전류(IB)가 증가하면 차동증폭기(OP1)의 출력전압이 감소하게 되므로 차동증폭기(OP3)의 출력전압은 차동증폭기(OP1)의 출력전압이 감소한 만큼 증가하게되고, 비임전류(IB)가 감소하면 차동증폭기(OP1)의 출력전압은 증가하게 되므로 차동증폭기(OP3)의 출력전압은 증가한 만큼 감소하게 되므로서 제어전극인 그리드단자(G1)의 전압을 변화시켜 라스터의 화면 밝기를 보정하게 된다.At this time, when the beam current IB increases, the output voltage of the differential amplifier OP1 decreases, so that the output voltage of the differential amplifier OP3 increases as the output voltage of the differential amplifier OP1 decreases, and the beam current IB increases. If the) decreases, the output voltage of the differential amplifier OP1 increases, so that the output voltage of the differential amplifier OP3 decreases as the increase increases, changing the voltage of the control terminal grid terminal G1 to change the brightness of the raster screen. Will be corrected.
또한, 수평해상도에 따른 전압, 즉, 수평주파수(fH)가 증가하게 되면 차동증폭기(OP2)의 출력전압이 증가하게 되므로 차동증폭기(OP3)의 출력전압은 차동증폭기(OP2)의 출력전압이 증가한 만큼 감소하게 되고, 수평주파수(fH)가 감소하게 되면 차동증폭기(OP2)의 출력전압이 감소하게 되므로 차동증폭기(OP3)의 출력전압은 차동증폭기(OP2)의 출력전압이 감소한 만큼 증가하게 되어 제어전극인 그리드단자(G1)의 전압을 변화시켜 라스터의 화면 밝기를 보정하게 된다.In addition, when the voltage according to the horizontal resolution, that is, the horizontal frequency fH increases, the output voltage of the differential amplifier OP2 increases, so that the output voltage of the differential amplifier OP3 increases the output voltage of the differential amplifier OP2. When the horizontal frequency fH decreases, the output voltage of the differential amplifier OP2 decreases, so that the output voltage of the differential amplifier OP3 increases as the output voltage of the differential amplifier OP2 decreases. The brightness of the raster screen is corrected by changing the voltage of the grid terminal G1 as an electrode.
그리고, 뮤트신호(M)가 뮤트부(7)의 트랜지스터(Q1)의 베이스에 입력되면 뮤트부(7)는 하이레벨이 되므로 다이오드(D1)의 양극쪽을 음전원(Vbb)에 가깝게 끌어내림으로서 콘덴서(C2)을 통하여 그리드단자(G1)에 블랭킹신호(BLK)을 인가하므로서 화면이 보이지 않게 한다.When the mute signal M is input to the base of the transistor Q1 of the mute portion 7, the mute portion 7 is at a high level so that the anode side of the diode D1 is brought closer to the negative power source Vbb. As a result, the blanking signal BLK is applied to the grid terminal G1 through the capacitor C2 so that the screen is not visible.
이상에서 설명한 바와같이 비임전류(IB)와 수평주파수(fH) 해상도에 따른 전압의 변화로 인한 라스터의 밝기 변화를 변화된 전압만큼 보정하여 주므로서, 항상 일정한 레벨의 라스터 밝기를 유지할 수 있는 효과가 있다.As described above, since the change in the brightness of the raster due to the change of the voltage according to the beam current (IB) and the horizontal frequency (fH) resolution is corrected by the changed voltage, it is possible to maintain the raster brightness at a constant level at all times. There is.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019940020233U KR970002565Y1 (en) | 1994-08-10 | 1994-08-10 | Modification circuit for a raster brightness in a multi mode monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019940020233U KR970002565Y1 (en) | 1994-08-10 | 1994-08-10 | Modification circuit for a raster brightness in a multi mode monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960008994U KR960008994U (en) | 1996-03-16 |
| KR970002565Y1 true KR970002565Y1 (en) | 1997-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019940020233U KR970002565Y1 (en) | 1994-08-10 | 1994-08-10 | Modification circuit for a raster brightness in a multi mode monitor |
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| Country | Link |
|---|---|
| KR (1) | KR970002565Y1 (en) |
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1994
- 1994-08-10 KR KR2019940020233U patent/KR970002565Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR960008994U (en) | 1996-03-16 |
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