KR20020016124A - circuit for controlling common voltage in the Liquid Crystal Display - Google Patents

circuit for controlling common voltage in the Liquid Crystal Display Download PDF

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Publication number
KR20020016124A
KR20020016124A KR1020000049282A KR20000049282A KR20020016124A KR 20020016124 A KR20020016124 A KR 20020016124A KR 1020000049282 A KR1020000049282 A KR 1020000049282A KR 20000049282 A KR20000049282 A KR 20000049282A KR 20020016124 A KR20020016124 A KR 20020016124A
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South Korea
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common voltage
terminal
liquid crystal
crystal display
variable resistor
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KR1020000049282A
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Korean (ko)
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박성진
이형석
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구본준, 론 위라하디락사
엘지.필립스 엘시디 주식회사
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Priority to KR1020000049282A priority Critical patent/KR20020016124A/en
Publication of KR20020016124A publication Critical patent/KR20020016124A/en

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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
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc
    • G05F1/63—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc using variable impedances in series with the load as final control devices
    • G05F1/648—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc using variable impedances in series with the load as final control devices being plural resistors among which a selection is made

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A regulator circuit for common voltage of an LCD(liquid crystal display) is provided to finely regulate common voltage to minimize flicker by connecting a third resistance with a variable resistance in parallel connection. CONSTITUTION: A regulator circuit for common voltage of an LCD comprises a variable resistance(VR1) and a resistance(R1,R2,R3). The variable resistance regulates voltage of power source terminal so as to output common voltage to an output terminal. The resistance is connected with the variable resistance between the power source terminal and the output terminal in parallel connection. The power source terminal includes a constant-voltage terminal, an earth terminal, and a plurality of resistances serially connected with the variable resistance(VR1) between the constant-voltage terminal and the earth terminal.

Description

액정표시장치의 공통 전압 조절회로{circuit for controlling common voltage in the Liquid Crystal Display}Circuit for controlling common voltage in the Liquid Crystal Display}

본 발명은 액정표시장치에 관한 것으로, 특히 공통전압을 조절하는 공통전압 조절회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a common voltage regulating circuit for regulating a common voltage.

일반적으로 액정표시장치는 박막트랜지스터와 화소전극이 배열되는 하측 유리기판과, 색상을 나타내기 위한 칼라 필터 및 공통전극이 구성되는 상측 유리기판과, 상기 상하 유리기판 사이에 채워지는 액정층으로 구성된다.In general, a liquid crystal display device includes a lower glass substrate on which a thin film transistor and a pixel electrode are arranged, an upper glass substrate on which a color filter and a common electrode are formed for displaying color, and a liquid crystal layer filled between the upper and lower glass substrates. .

이와 같이 구성되는 액정표시장치에서 공통전압은 미세하게 조절되어 공통전극에 인가되어야만 플리커(flicker) 발생을 최소화시킬 수 있다.In the liquid crystal display device configured as described above, the common voltage may be finely controlled and applied to the common electrode to minimize flicker.

이와 같이 플리커 현상을 최소화시키기 위한 종래의 액정표시장치의 공통전압 조절회로를 첨부된 도면을 참조하여 설명하면 다음과 같다.As described above, the common voltage control circuit of the conventional liquid crystal display device for minimizing the flicker phenomenon will be described with reference to the accompanying drawings.

도 1은 종래의 액정표시장치의 공통전압 조절회로의 구성도이다.1 is a configuration diagram of a common voltage control circuit of a conventional liquid crystal display device.

종래의 액정표시장치의 공통전압 조절회로는, 도 1과 같이, 전원단(+V)과 접지단(GND) 사이에 제 1 저항(R1), 가변저항(VR1), 제 2 저항(R2)가 직렬 연결되어 있고, 상기 제 1 저항(R1)과 가변저항(VR1) 사이에 출력단(Vcom)이 연결되어 있다. 따라서, 상기 저항들에 의해 분압된 전압이 공통전압으로 출력되도록 되어 있다. 이 때, 상기 가변저항(VR1)의 저항값 변화에 따라 공통전압이 조절되도록 되어 있다. 즉, 가변저항(VR1)의 저항값이 가장 적을 때 가장 적은 공통전압(Vcom)이 출력되고 가변저항이 증가하면 상대적으로 공통전압도 증가하게 된다.In the common voltage control circuit of the conventional liquid crystal display device, as shown in FIG. 1, the first resistor R1, the variable resistor VR1, and the second resistor R2 are disposed between the power supply terminal (+ V) and the ground terminal (GND). Is connected in series, and the output terminal Vcom is connected between the first resistor R1 and the variable resistor VR1. Therefore, the voltage divided by the resistors is output to the common voltage. At this time, the common voltage is adjusted according to the change in the resistance value of the variable resistor VR1. That is, when the resistance value of the variable resistor VR1 is the smallest, the least common voltage Vcom is output, and when the variable resistor increases, the common voltage also increases relatively.

그러나 이와같은 종래의 액정표시장치의 공통전압 조절회로에 있어서는 다음과 같은 문제점이 있었다.However, such a common voltage control circuit of the conventional liquid crystal display device has the following problems.

즉, 종래의 공통전압 조절회로는 단순히 전압을 분압하는 구조로 되어 있으므로 가변저항(VR1)의 회전각에 대한 공통전압의 조절값이 크다. 따라서, 미세한 공통전압의 조절이 어려우므로 플리커를 최소화하는데 한계가 있다.That is, the conventional common voltage regulating circuit simply has a structure for dividing the voltage, so that the adjustment value of the common voltage with respect to the rotation angle of the variable resistor VR1 is large. Therefore, since it is difficult to control the fine common voltage, there is a limit to minimizing flicker.

본 발명은 이와 같은 문제점을 해결하기 위하여 안출한 것으로, 저항을 하나 더 추가하여 가변 저항의 같은 회전수에 더 미세한 저항 조절이 가능하도록 하여 플리커를 최소화할 수 있는 액정표시장치의 공통전압 조절회로를 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, and by adding one more resistor to enable finer resistance control at the same rotational speed of the variable resistor, a common voltage control circuit of the liquid crystal display device can minimize flicker. The purpose is to provide.

도 1은 종래의 액정표시장치의 공통전압 조절회로 구성도1 is a configuration diagram of a common voltage control circuit of a conventional liquid crystal display device

도 2는 본 발명의 액정표시장치의 공통전압 조절회로 구성도2 is a configuration diagram of a common voltage control circuit of the liquid crystal display device of the present invention.

도 3은 종래와 본 발명에서 공통전압 조절회로의 가변저항의 회전에 따른 출력된 공통전압의 크기를 나타낸 그래프Figure 3 is a graph showing the magnitude of the output common voltage according to the rotation of the variable resistor of the common voltage control circuit in the prior art and the present invention

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

R1, R2, R3 : 저항 VR1 : 가변 저항R1, R2, R3: resistor VR1: variable resistor

이와 같은 목적을 달성하기 위한 본 발명의 액정표시장치의 공통전압 조절회로는, 전원단의 전압을 조절하여 출력단에 공통전압을 출력하는 가변저항과, 상기 전원단과 출력단 사이에 상기 가변저항에 병렬 연결되는 저항을 포함하여 구성됨에 그 특징이 있다.The common voltage control circuit of the liquid crystal display device of the present invention for achieving the above object, a variable resistor for outputting a common voltage to the output terminal by adjusting the voltage of the power supply terminal, and connected in parallel to the variable resistor between the power supply terminal and the output terminal. It is characterized by being configured to include a resistor.

상기와 같은 본 발명의 액정표시장치의 공통전압 조절회로를 첨보된 도면을 참조하여 보다 상세히 설명하면 다음과 같다.The common voltage control circuit of the liquid crystal display of the present invention as described above will be described in more detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 공통전압 조절회로의 구성도이다.2 is a configuration diagram of a common voltage control circuit according to the present invention.

본 발명의 액정표시장치의 공통전압 조절회로는, 도 2와 같이, 전원단(+V)과 접지단(GND) 사이에 제 1 저항(R1), 가변저항(VR1), 제 2 저항(R2)가 직렬 연결되어 있고, 상기 제 1 저항(R1)과 가변 저항(VR1) 사이에 출력단(Vcom)이 연결되어 있으며, 또한, 상기 출력단(Vcom)과 상기 가변저항(VR1)과 제 2 저항(R2)의 접점 사이에 제 3 저항(R3)이 연결되어 있다. 즉, 상기 가변저항(VR1)에 병렬로 제 3 저항(R3)이 연결되어 있다.In the common voltage control circuit of the liquid crystal display of the present invention, as shown in FIG. 2, the first resistor R1, the variable resistor VR1, and the second resistor R2 between the power supply terminal (+ V) and the ground terminal (GND). ) Is connected in series, the output terminal Vcom is connected between the first resistor R1 and the variable resistor VR1, and the output terminal Vcom, the variable resistor VR1 and the second resistor ( The third resistor R3 is connected between the contacts of R2). That is, a third resistor R3 is connected to the variable resistor VR1 in parallel.

이와 같은 본 발명의 액정표시장치의 공통전압 조절회로의 동작을 설명하면 다음과 같다.Referring to the operation of the common voltage control circuit of the liquid crystal display device of the present invention as follows.

도 3은 종래와 본 발명에서 공통전압 조절회로의 가변저항의 회전에 따른 출력된 공통전압의 크기를 나타낸 것이다.Figure 3 shows the magnitude of the output common voltage according to the rotation of the variable resistor of the common voltage control circuit in the prior art and the present invention.

즉, 종래에는 가변저항(VR1)의 회전각에 따라 저항값이 직선(1차함수)으로증가하였다. 그러나 본 발명에 따르면, 상술한 바와 같이 가변저항(VR1)과 제 3 저항(R3)이 병렬 연결되어 있으므로 가변저항(VR1)의 회전각에 따라 저항값이 증가하지만 그 기울기가 상기 종래의 1/2로 감소하고 2차함수적으로 증가한다. 따라서, 가변저항(VR1)의 회전각에 대해 미세한 공통전압이 출력된다.That is, in the related art, the resistance value increases in a straight line (first function) according to the rotation angle of the variable resistor VR1. According to the present invention, however, since the variable resistor VR1 and the third resistor R3 are connected in parallel as described above, the resistance value increases according to the rotation angle of the variable resistor VR1, but the slope thereof is 1 /. Decreases to 2 and increases quadratic Therefore, a fine common voltage is output with respect to the rotation angle of the variable resistor VR1.

이상에서 설명한 바와 같이, 본 발명의 액정표시장치의 공통전압 조절회로에 있어서는 다음과 같은 효과가 있다.As described above, the common voltage control circuit of the liquid crystal display device of the present invention has the following effects.

즉, 상기 가변저항에 병렬로 제 3 저항을 연결하므로 가변 저항의 회전각에 더 미세한 저항 조절이 가능하여 미세한 공통전압 조절이 실현된다. 따라서, 공통전압을 미세하게 조절할 수 있으므로 공통 전압을 보다 정확하게 셋팅할 수 있으며, 더불어 플리커를 최소화할 수 있다.That is, since the third resistor is connected in parallel to the variable resistor, finer resistance can be adjusted to the rotation angle of the variable resistor, so that fine common voltage control is realized. Therefore, since the common voltage can be finely adjusted, the common voltage can be set more accurately, and flicker can be minimized.

Claims (2)

전원단의 전압을 조절하여 출력단에 공통전압을 출력하는 가변저항과,A variable resistor for controlling the voltage at the power supply terminal to output a common voltage to the output terminal; 상기 전원단과 출력단 사이에 상기 가변저항에 병렬 연결되는 저항을 포함하여 구성됨을 특징으로 하는 액정표시장치의 공통전압 조절회로.And a resistor connected in parallel to the variable resistor between the power supply terminal and the output terminal. 제 1 항에 있어서,The method of claim 1, 상기 전원단은 정전압단과 접지단을 구비하고 상기 정전압단과 접지단 사이에 상기 가변저항과 직렬로 연결되는 복수개의 저항을 더 포함함을 특징으로 액정표시장치의 공통전압 조절회로.The power supply terminal further includes a plurality of resistors including a constant voltage terminal and a ground terminal and connected in series with the variable resistor between the constant voltage terminal and the ground terminal.
KR1020000049282A 2000-08-24 2000-08-24 circuit for controlling common voltage in the Liquid Crystal Display KR20020016124A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030056526A (en) * 2001-12-28 2003-07-04 엘지.필립스 엘시디 주식회사 method for driving of liquid crystal display
KR100498542B1 (en) * 2002-09-06 2005-07-01 엘지.필립스 엘시디 주식회사 data drive IC of LCD and driving method of thereof
CN108510930A (en) * 2018-03-19 2018-09-07 广东欧珀移动通信有限公司 Electronic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030056526A (en) * 2001-12-28 2003-07-04 엘지.필립스 엘시디 주식회사 method for driving of liquid crystal display
KR100498542B1 (en) * 2002-09-06 2005-07-01 엘지.필립스 엘시디 주식회사 data drive IC of LCD and driving method of thereof
CN108510930A (en) * 2018-03-19 2018-09-07 广东欧珀移动通信有限公司 Electronic device
CN108510930B (en) * 2018-03-19 2021-06-15 Oppo广东移动通信有限公司 Electronic device

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