KR20030032338A - Display light modulating apparatus - Google Patents

Display light modulating apparatus Download PDF

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Publication number
KR20030032338A
KR20030032338A KR1020010064067A KR20010064067A KR20030032338A KR 20030032338 A KR20030032338 A KR 20030032338A KR 1020010064067 A KR1020010064067 A KR 1020010064067A KR 20010064067 A KR20010064067 A KR 20010064067A KR 20030032338 A KR20030032338 A KR 20030032338A
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South Korea
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display
input terminal
terminal
resistor
inverting
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KR1020010064067A
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Korean (ko)
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KR100416707B1 (en
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이종국
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위니아만도 주식회사
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Priority to KR10-2001-0064067A priority Critical patent/KR100416707B1/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
    • H04N5/58—Control of contrast or brightness in dependence upon ambient light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE: A device for controlling brightness for display is provided to invert voltage applied to the display by current flowing in a diode in accordance with external brightness without control under a microcomputer. CONSTITUTION: A current of photo diode(40) varies according to external brightness. An amplifying part(50) compares outputs of the photo diode(40) with the first reference voltage for amplification. An inverting part(60) compares outputs of the amplifying part(50) with the second reference voltage for inversion and control. A switching part(20) controls voltage applied to a display(10) according to output values of the amplifying part(50). The photo diode(40) is connected to an inverting input terminal(-) of the first OP amplifier(OP1) of the amplifying part(50) via the first resistance(R1). A non-inverting input terminal(+) of the first OP amplifier(OP1) is connected to the first reference voltage set by distributing a power terminal(VCC) by the second and third resistances(R2,R3). An output terminal of the first OP amplifier(OP1) is connected for feedback to the inverting input terminal(-) and the fourth resistance(R4). The output terminal of the first OP amplifier(OP1) is connected to a non-inverting input terminal(+) of the second OP amplifier(OP2) in the inverting part(60) via the fifth resistance(R5). An inverting input terminal(-) of the second OP amplifier(OP2) is connected to the second reference voltage set by distributing a power terminal(VCC) by the sixth and seventh resistance(R6,R7). An output terminal of the second OP amplifier(OP2) is connected to a transistor(TR) base terminal of the switching part(60) via the ninth resistance(R9).

Description

디스플레이의 밝기 조절장치{DISPLAY LIGHT MODULATING APPARATUS}Display brightness control {DISPLAY LIGHT MODULATING APPARATUS}

본 발명은 디스플레이의 밝기 조절장치에 관한 것으로서, 보다 상세하게는 외부의 밝기에 따라 감지부에 흐르는 전류량에 의해 디스플레이에 걸리는 전압을 반전시켜 조절함으로써 외부가 밝을 경우 디스플레이를 어둡게 조절하고 외부가 어두울 경우 디스플레이를 밝게 조절하는 디스플레이의 밝기 조절장치에 관한 것이다.The present invention relates to a brightness adjusting device of a display, and more particularly, by inverting and adjusting the voltage applied to the display by the amount of current flowing in the sensing unit according to the brightness of the outside, when the outside is bright, the display is dark and the outside is dark. It relates to a display brightness control device for brightening the display.

디스플레이는 각종 전자장치의 작동상태나 설정상태를 사용자에게 표시하기 위해 설치되는 것으로써 LED나 LCD 등으로 구성된다.The display is installed to display the operation state or setting state of various electronic devices to the user, and is composed of LEDs or LCDs.

이러한 디스플레이의 밝기는 일정하기 때문에 어두운 곳에서 디스플레이를 보기 위해서는 별도의 조명장치를 설치하여 조명장치를 작동시킴으로써 디스플레이에 표시되는 내용을 보게 된다.Since the brightness of the display is constant, in order to view the display in a dark place, a separate lighting device is installed and the lighting device is operated to see what is displayed on the display.

또한, 디스플레이의 밝기를 조절하기 위한 디스플레이의 밝기 조절장치를 설치하여 디스플레이의 밝기를 조절하면서 디스플레이에 표시되는 내용을 인지하게 된다.In addition, by installing a display brightness adjusting device for adjusting the brightness of the display to adjust the brightness of the display to recognize the content displayed on the display.

도 1은 종래의 디스플레이의 밝기 조절장치를 나타낸 회로구성도이다.1 is a circuit diagram illustrating a brightness adjusting device of a conventional display.

여기에 도시된 바와 같이 일측이 전원단(VCC)과 연결된 디스플레이(10)와, 디스플레이(10)의 타측과 접지단(GND) 사이에 연결되어 디스플레이(10)에 걸리는 전압을 조절하기 위한 스위칭부(20)와, 스위칭부(20)의 온오프량을 조절하는 마이컴(30)으로 이루어진다.As shown here, one side is connected to the display 10 connected to the power supply terminal VCC, and a switching unit connected between the other side of the display 10 and the ground terminal GND to adjust the voltage applied to the display 10. 20 and the microcomputer 30 for adjusting the on / off amount of the switching unit 20.

따라서, 마이컴(30)에서 사용자가 설정한 밝기에 따라 조절하거나 시간의 경과에 따라 설정된 시간에 밝기를 조절하는 등 사용자가 임의로 설정된 상황에 따라 듀티비제어를 하여 스위칭부(20)의 트랜지스터(TR)의 온오프량을 조절함으로써 디스플레이(10)에 걸리는 전압을 높이거나 낮추어 디스플레이(10)를 구성하는 램프(LP1, LP2, LP3)들의 밝기를 조절하게 된다.Accordingly, the transistor TR of the switching unit 20 is controlled by the duty ratio control according to a situation in which the user arbitrarily sets, for example, by adjusting the brightness set by the user in the microcomputer 30 or by adjusting the brightness at a set time according to the passage of time. By adjusting the on / off amount of), the voltage applied to the display 10 is increased or decreased to adjust the brightness of the lamps LP1, LP2, and LP3 constituting the display 10.

즉, 스위칭부(20)의 온시간이 길 경우 디스플레이(10)가 밝아지게 되고 오프시간이 길 경우 디스플레이(10)가 어두어지게 된다.That is, when the on time of the switching unit 20 is long, the display 10 becomes bright and when the off time is long, the display 10 becomes dark.

이와 같이 디스플레이(10)의 밝기를 조절할 경우 스위칭부(20)를 조절하기 위한 마이컴(30)을 설치해야만 되고 사용자가 특정키를 입력하여 디스플레이(10)의 밝기 조절을 위한 설정을 해야만 하는 문제점이 있다.As such, when the brightness of the display 10 is adjusted, the microcomputer 30 for adjusting the switching unit 20 must be installed, and the user must set a setting for brightness adjustment of the display 10 by inputting a specific key. have.

본 발명은 상기와 같은 문제점을 해결하기 위해 창작된 것으로서, 본 발명의 목적은 마이컴의 듀티제어가 아닌 외부의 밝기에 따라 감지부에 흐르는 전류량에 의해 디스플레이에 걸리는 전압을 반전시켜 조절함으로써 외부가 밝을 경우 디스플레이를 어둡게 조절하고 외부가 어두울 경우 디스플레이를 밝게 조절하는 디스플레이의 밝기 조절장치를 제공함에 있다.The present invention was created to solve the above problems, and an object of the present invention is to control the voltage applied to the display by the amount of current flowing through the sensing unit according to the brightness of the external device, not the duty control of the microcomputer, thereby controlling the external brightness. The present invention provides a display brightness control device that controls the display in the dark and brightens the display in the dark.

도 1은 종래의 디스플레이 밝기 조절장치를 나타낸 회로구성도이다.1 is a circuit diagram illustrating a conventional display brightness adjusting device.

도 2는 본 발명에 의한 디스플레이 밝기 조절장치를 나타낸 회로구성도이다.Figure 2 is a circuit diagram showing a display brightness adjustment apparatus according to the present invention.

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

10 : 디스플레이 20 : 스위칭부10: display 20: switching unit

30 : 마이컴 40 : 광감지부30: microcomputer 40: light sensing unit

50 : 증폭부 60 : 반전부50: amplification unit 60: inverting unit

상기와 같은 목적을 실현하기 위한 본 발명은 외부의 밝기에 따라 전류량이 변하는 광감지부와, 광감지부의 출력을 제 1기준전압과 비교하여 증폭하는 증폭부과, 증폭부의 출력값을 제 2기준전압과 비교하여 반전제어하는 반전부과, 반전부의 출력값에 따라 디스플레이로 공급되는 전압을 조절하는 스위칭부로 이루어진 것을 특징으로 한다.According to the present invention for realizing the above object, an optical sensing unit in which a current amount changes according to an external brightness, an amplifying unit for amplifying the output of the optical sensing unit with a first reference voltage, and an output value of the amplifying unit with a second reference voltage. In comparison, the inversion unit for controlling the inversion, and the switching unit for adjusting the voltage supplied to the display according to the output value of the inversion unit.

위와 같이 이루어진 본 발명은 외부의 밝기에 따라 변하는 광감지부의 전류량을 제 1기준전압과 비교하여 증폭하고 이 증폭된 값을 제 2기준전압과 비교하여반전함으로써 외부의 밝기가 밝을 경우 스위칭부를 통해 디스플레이로 공급되는 전압을 낮추어 디스플레이를 어둡게 하고 외부가 어두울 경우 스위칭부를 통해 디스플레이로 공급되는 전압을 높여 디스플레이를 밝게 조절하도록 작동된다.The present invention made as described above is amplified by comparing the current amount of the light sensing unit changes according to the external brightness with the first reference voltage and inverted by amplifying the amplified value compared with the second reference voltage when the external brightness is bright display through the switching unit It lowers the voltage supplied to the display to darken the display, and when it is dark, it operates to brighten the display by increasing the voltage supplied to the display through the switching unit.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명한다. 또한 본 실시예는 본 발명의 권리범위를 한정하는 것은 아니고, 단지 예시로 제시된 것이며 종래 구성과 동일한 부분은 동일한 부호 및 명칭을 사용한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only and the same parts as in the conventional configuration using the same reference numerals and names.

도 2는 본 발명에 의한 디스플레이 밝기 조절장치를 나타낸 회로구성도이다.Figure 2 is a circuit diagram showing a display brightness adjustment apparatus according to the present invention.

여기에 도시된 바와 같이 외부의 밝기에 따라 전류량이 변하는 광감지부(40)와, 광감지부(40)의 출력을 제 1기준전압과 비교하여 증폭하는 증폭부(50)과, 증폭부(50)의 출력값을 제 2기준전압과 비교하여 반전제어하는 반전부(60)과, 반전부(60)의 출력값에 따라 디스플레이(10)로 공급되는 전압을 조절하는 스위칭부(20)로 이루어진다.As shown here, the light sensing unit 40 whose current amount changes according to the external brightness, the amplifying unit 50 for amplifying the output of the light sensing unit 40 with the first reference voltage, and an amplifying unit ( An inverting unit 60 for inverting and controlling the output value of the 50 by comparing with the second reference voltage, and a switching unit 20 for adjusting the voltage supplied to the display 10 according to the output value of the inverting unit 60.

즉, 광감지부(50)는 포토다이오드(PD)로써 증폭부(50)의 제 1오피앰프(OP1)의 반전입력단(-)에 제 1저항(R1)을 매개로 연결되고 비반전입력단자(+)에는 제 2저항(R2)과 제 3저항(R3)에 의해 전원단(VCC)을 분배하여 설정한 제 1기준전압이 연결되고, 제 1오피앰프(OP1)의 출력단은 반전입력단(-)과 제 4저항(R4)으로 피드백되도록 연결된다.That is, the photodetector 50 is a photodiode PD connected to the inverting input terminal (-) of the first op amp OP1 of the amplifying unit 50 via the first resistor R1 and the non-inverting input terminal. (+) Is connected to the first reference voltage set by dividing the power supply terminal VCC by the second resistor R2 and the third resistor R3, and the output terminal of the first op amp OP1 is an inverting input terminal ( -) And the fourth resistor (R4) is connected to feed back.

또한, 제 1오피앰프(OP1)의 출력단은 반전부(60)인 제 2오피앰프(OP2)의 비반전입력단(+)에 제 5저항(R5)을 매개로 연결되고 반전입력단(-)에는 제 6저항(R6)과 제 7저항(R7)에 의해 전원단(VCC)을 분배하여 설정한 제 2기준전압이 연결되고 제 2오피앰프(OP2)의 출력단은 스위칭부(60)의 트랜지스터(TR) 베이스단에 제 9저항(R9)을 매개로 연결된다. 그리고, 트랜지스터(TR)의 콜렉터와 제 8저항(R8)으로 반전입력단(-)과 피드백되도록 연결되고, 콜렉터에는 접지단(GND)과 디스플레이(10)의 램프(LP1, LP2, LP3)들이 매개되며 이미터에는 전원단(VCC)이 연결된다.In addition, the output terminal of the first op amp OP1 is connected to the non-inverting input terminal (+) of the second op amp OP2, which is the inverting unit 60, via a fifth resistor R5, and to the inverting input terminal (-). The second reference voltage set by dividing the power supply terminal VCC is connected by the sixth resistor R6 and the seventh resistor R7, and the output terminal of the second op amp OP2 is connected to the transistor of the switching unit 60. TR) is connected to the base terminal via a ninth resistor R9. In addition, the collector of the transistor TR and an eighth resistor R8 are connected to be fed back to the inverting input terminal (-), and the collector has a ground terminal GND and lamps LP1, LP2, LP3 of the display 10. The emitter is connected to a power supply (VCC).

이와 같이 구성된 본 발명의 작동을 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above is as follows.

외부가 밝을 경우 포토다이오드(PD)에 흐르는 전류량이 증가하게 된다. 그러면 제 1저항(R1)을 통해 전압값으로 변환되어 제 1오피앰프(OP1)에 입력되어 제 2저항(R2)과 제 3저항(R3)에 의해 분배된 제 1기준전압보다 낮을 때까지 증가하는 전류량에 따라 출력값이 증가되어 증폭된다. 즉, 외부가 밝아짐에 따라 출력값이 증가하여 일정한 밝기까지 증가하게 된다.If the outside is bright, the amount of current flowing through the photodiode PD increases. Then, the voltage is converted into a voltage value through the first resistor R1 and input to the first op amp OP1 until the voltage is lower than the first reference voltage distributed by the second resistor R2 and the third resistor R3. The output value is amplified by increasing the amount of current. That is, as the outside becomes brighter, the output value increases to increase to a certain brightness.

이렇게 증가된 제 1오피앰프(OP1)의 출력값은 다시 제 2기준전압과 비교되어 제 2기준전압보다 높을 경우 감소된 제 2오피앰프(OP2)의 출력값이 트랜지스터(TR)의 베이스단에 입력되어 디스플레이(10)에 공급되는 전압을 낮춤으로써 램프(LP1, LP2, LP3)들이 어둡게 된다.The output value of the first OP amp OP1 thus increased is again compared with the second reference voltage, and when the output value of the second OP amp OP2 is lower than the second reference voltage, the output value of the second OP amp OP2 is input to the base terminal of the transistor TR. By lowering the voltage supplied to the display 10, the lamps LP1, LP2, LP3 are darkened.

즉, 외부의 밝기가 밝아질 경우 디스플레이(10)에 공급되는 전압을 낮추어 어둡도록 한다.That is, when the brightness of the outside becomes bright, the voltage supplied to the display 10 is lowered to make it dark.

반면에 외부가 어둡게 될 경우 포토다이오드(PD)에 흐르는 전류량이 감소하게 된다. 그러면 제 1저항(R1)을 통해 전압값으로 변환되어 제 1오피앰프(OP1)에입력되어 전류량에 따라 출력값이 감소된다. 즉, 외부가 어두워짐에 따라 출력값이 감소하게 된다.On the other hand, when the outside becomes dark, the amount of current flowing through the photodiode PD is reduced. Then, the voltage is converted into a voltage value through the first resistor R1 and input to the first op amp OP1 to reduce the output value according to the amount of current. That is, the output value decreases as the outside becomes darker.

이렇게 감소되는 제 1오피앰프(OP1)의 출력값은 다시 제 2기준전압과 비교되어 제 2기준전압보다 낮을 경우 증폭되어 증가되는 제 2오피앰프(OP2)의 출력값이 트랜지스터(TR)의 베이스단에 입력되어 디스플레이(10)에 공급되는 전압을 높여줌으로써 램프(LP1, LP2, LP3)들이 밝아지게 된다.The output value of the first op amp OP1 reduced in this way is again compared with the second reference voltage, and the output value of the second op amp OP2, which is amplified and increased when it is lower than the second reference voltage, is applied to the base terminal of the transistor TR. The lamps LP1, LP2, and LP3 are brightened by increasing the voltage input and supplied to the display 10.

즉, 외부의 밝기가 어두워질 경우 디스플레이(10)에 공급되는 전압을 높아져 밝게 된다.That is, when the brightness of the outside becomes dark, the voltage supplied to the display 10 is increased to be bright.

상기한 바와 같이 본 발명은 마이컴이나 사용자의 설정없이 외부의 밝기에 따라 감지부에 흐르는 전류량에 의해 디스플레이에 걸리는 전압을 반전시켜 조절함으로써 외부가 밝을 경우 디스플레이를 어둡게 조절하고 외부가 어두울 경우 디스플레이를 밝게 조절하여 자동으로 외부의 밝기에 따라 조도가 조절되어 시인성(示認成)을 높일 수 있는 이점이 있다.As described above, the present invention adjusts by inverting the voltage applied to the display by the amount of current flowing in the sensing unit according to the external brightness without the setting of a microcomputer or a user, so that the display is dark when the outside is dark and the display is bright when the outside is dark. By adjusting the illuminance automatically according to the external brightness, there is an advantage that can increase the visibility.

Claims (6)

외부의 밝기에 따라 전류량이 변하는 광감지부와,The light sensing unit changes the amount of current according to the brightness of the outside, 상기 광감지부의 출력을 제 1기준전압과 비교하여 증폭하는 증폭부과,An amplifying unit configured to amplify the output of the light sensing unit by comparing with a first reference voltage; 상기 증폭부의 출력값을 제 2기준전압과 비교하여 반전제어하는 반전부과,An inverting unit for inverting and comparing the output value of the amplifying unit with a second reference voltage; 상기 반전부의 출력값에 따라 디스플레이로 공급되는 전압을 조절하는 스위칭부A switching unit for adjusting the voltage supplied to the display in accordance with the output value of the inverting unit 로 이루어진 것을 특징으로 하는 디스플레이 밝기 조절장치.Display brightness adjustment device characterized in that consisting of. 제 1항에 있어서, 상기 광감지부는 포토다이오드인 것을 특징으로 하는 디스플레이 밝기 조절장치.The display brightness adjusting apparatus of claim 1, wherein the light sensing unit is a photodiode. 제 1항에 있어서, 상기 증폭부는 제 1오피앰프로 이루어진 것을 특징으로 하는 디스플레이 밝기 조절장치.The display brightness adjusting apparatus of claim 1, wherein the amplifier comprises a first op amp. 제 1항에 있어서, 상기 반전부는 제 2오피앰프로 이루어진 것을 특징으로 하는 디스플레이 밝기 조절장치.The display brightness adjusting apparatus of claim 1, wherein the inverting unit comprises a second op amp. 제 1항에 있어서, 상기 스위칭부는 트랜지스터로 이루어진 것을 특징으로 하는 디스플레이 밝기 조절장치.The display brightness adjusting apparatus of claim 1, wherein the switching unit comprises a transistor. 외부의 밝기에 따라 전류량이 변하는 포토다이오드와,Photodiode that changes the amount of current according to the brightness of the outside, 상기 포토다이오드와 반전입력단에 제 1저항을 매개로 연결되고 비반전입력단자에는 제 2저항과 제 3저항에 의해 전원단을 분배하여 설정한 제 1기준전압이 연결되고, 출력단은 반전입력단과 제 4저항으로 피드백되도록 연결된 제 1오피앰프와,The photodiode and the inverting input terminal are connected to each other via a first resistor, and the non-inverting input terminal is connected to a first reference voltage set by dividing a power supply terminal by a second resistor and a third resistor, and the output terminal is connected to the inverting input terminal and the third input terminal. A first op amp connected to feed back with 4 resistors, 상기 제 1오피앰프의 출력단이 비반전입력단에 제 5저항을 매개로 연결되고 반전입력단에는 제 6저항과 제 7저항에 의해 전원단을 분배하여 설정한 제 2기준전압이 연결되는 제 2오피앰프와,The second op amp connected to the output terminal of the first op amp via a fifth resistor through a non-inverting input terminal, and the second input voltage connected to the inverting input terminal by setting a power source by a sixth resistor and a seventh resistor. Wow, 상기 제 2오피앰프의 출력단과 베이스단에 제 9저항을 매개로 연결되고, 콜렉터와 제 8저항으로 상기 제 2오피앰프의 반전입력단과 피드백되도록 연결되고, 콜렉터에는 접지단과 디스플레이가 매개되며 이미터에는 전원단이 연결된 트랜지스터The output terminal and the base terminal of the second op amp are connected via a ninth resistor, and the collector and the eighth resistor are connected so as to be fed back to the inverting input terminal of the second op amp, and the collector is connected with a ground terminal and a display. There is a transistor connected to the power stage 로 이루어진 것을 특징으로 하는 디스플레이 밝기 조절장치.Display brightness adjustment device characterized in that consisting of.
KR10-2001-0064067A 2001-10-17 2001-10-17 Display light modulating apparatus KR100416707B1 (en)

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