KR100419088B1 - Apparatus for automatically adjusting common voltage - Google Patents

Apparatus for automatically adjusting common voltage Download PDF

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Publication number
KR100419088B1
KR100419088B1 KR1019960036721A KR19960036721A KR100419088B1 KR 100419088 B1 KR100419088 B1 KR 100419088B1 KR 1019960036721 A KR1019960036721 A KR 1019960036721A KR 19960036721 A KR19960036721 A KR 19960036721A KR 100419088 B1 KR100419088 B1 KR 100419088B1
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South Korea
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pixel
voltage
liquid crystal
crystal capacitor
common voltage
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KR1019960036721A
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Korean (ko)
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KR19980016971A (en
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최원준
박행원
이광수
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삼성전자주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • 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

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE: An apparatus for automatically adjusting a common voltage is provided to automatically adjust the common voltage so that a pixel charge voltage value of 2 fields is identical to a pixel charge voltage value of one field. CONSTITUTION: Dummy pixels(10,20,30) receive a line inverse signal as a data signal, and display the data signal by gate driving signals. The first comparator(40) compares a voltage charged in a liquid crystal capacitor of the dummy pixel(10) with a voltage charged in a liquid crystal capacitor of the dummy pixel(20). The second comparator(50) compares the voltage charged in the liquid crystal capacitor of the dummy pixel(20) with a voltage charged in a liquid crystal capacitor of the dummy pixel(30). A multiplexer(60) selects output signals of the first and second comparators(40,50) by the line inverse signal.

Description

공통 전압 자동 조절 장치Common Voltage Regulator

이 발명은 공통 전압 자동 조절 장치에 관한 것으로서, 더욱 상세히 말하자면 1필드(Field)의 화소 충전 전압값과 2필드(Field)의 화소 충전 전압값이 동일할 수 있도록 공통 전압을 자동으로 조절하는 공통 전압 자동 조절 장치에 관한 것이다.The present invention relates generally to an automatic common voltage regulator, and more particularly, to a common voltage automatic regulator which is capable of automatically controlling a common voltage so that a pixel charge voltage value of one field and a pixel charge voltage value of two fields And an automatic regulating device.

일반적으로 액정 표시 장치를 구동하는 데에 있어서, 도 1에 도시되어 있는 것처럼, 공통 전압(Vcom)을 중심으로 1필드의 화소 충전 전압값과 2필드의 화소 충전 전압값이 다르기 때문에 디스플레이 특성 및 화질이 저하되는 문제점이 있다.1, since the pixel charge voltage value of one field is different from the pixel charge voltage value of two fields around the common voltage Vcom, the display characteristics and image quality Is lowered.

따라서, 이 발명의 과제는 상기와 같은 문제점을 해결하기 위한 것으로서, 1필드의 화소 충전 전압값과 2필드의 화소 충전 전압값이 동일할 수 있도록 공통 전압을 자동으로 조절하는 공통 전압 자동 조절 장치를 제공하는 데에 있다.SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a common voltage automatic control device for automatically adjusting a common voltage so that a pixel charge voltage value of one field and a pixel charge voltage value of two fields are equal to each other To provide.

도 1은 일반적인 액정 표시 장치의 구동 파형도,1 is a driving waveform diagram of a general liquid crystal display device,

도 2는 일반적인 라인 반전 신호(Reverse Vertical Signal)의 파형도,2 is a waveform diagram of a general line inversion signal (Reverse Vertical Signal)

도 3은 이 발명의 실시예에 따른 공통 전압 자동 조절 장치의 구성도이다.3 is a configuration diagram of an automatic common voltage control device according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Description of the Related Art [0002]

Video signal : 비디오 데이타 Vscom : 기준 비디오 데이타Video signal: Video data Vscom: Reference video data

Vcom : 공통 전압 Vp : 화소 충전 전압 gate : 게이트 구동 신호Vcom: common voltage Vp: pixel charge voltage gate: gate drive signal

라인 반전 신호를 데이터 신호로 입력받고 공통 전압이 접지단에 고정되어 있으며, 게이트 구동 신호에 의해 상기 데이타 신호를 표시하기 위한 다수의 더미 화소(Dummy Pixel)와,A plurality of dummy pixels for receiving a line inversion signal as a data signal and having a common voltage fixed at a ground terminal and for displaying the data signal by a gate driving signal,

상기 다수의 더미 화소 가운데 첫 번째 화소의 액정 커패시터에 충전된 전압을 기준 전압으로 하여 두 번째 화소의 액정 커패시터에 충전된 전압과 비교하기 위한 제1 비교기와;A first comparator for comparing a voltage charged in a liquid crystal capacitor of a first pixel among the plurality of dummy pixels with a voltage charged in a liquid crystal capacitor of a second pixel as a reference voltage;

상기 두 번째 화소의 액정 커패시터에 충전된 전압을 기준 전압으로 하여 세 번째 화소의 액정 커패시터에 충전된 전압과 비교하기 위한 제2 비교기와;A second comparator for comparing the voltage charged in the liquid crystal capacitor of the second pixel with the voltage charged in the liquid crystal capacitor of the third pixel as a reference voltage;

상기 제1, 제2 비교기의 출력 신호를 상기 라인 반전 신호에 의해 선택하기 위한 멀티플렉서를 포함하여 이루어져 있다.And a multiplexer for selecting an output signal of the first and second comparators by the line inversion signal.

이하, 이 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 이 발명을 용이하게 실시할 수 있을 정도로 상세히 설명하기 위해 이 발명의 가장 바람직한 실시예를 첨부된 도면을 참조로 설명하기로 한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that the present invention may be easily carried out by those skilled in the art.

도 3은 이 발명의 실시예에 따른 공통 전압 자동 조절 장치의 구성도이다.3 is a configuration diagram of an automatic common voltage control device according to an embodiment of the present invention.

도 3에 도시되어 있듯이, 이 발명의 실시예에 따른 공통 전압 자동 조절 장치는,As shown in FIG. 3, the common voltage automatic control apparatus according to an embodiment of the present invention includes:

라인 반전 신호(RVS)를 데이터 신호로 입력받고 공통 전압이 접지단에 고정되어 있으며, 게이트 구동 신호(dummy_gate1∼dummy_gate3) 에 의해 상기 데이타 신호를 표시하기 위한 더미 화소(10, 20, 30)와;Dummy pixels (10, 20, 30) for receiving a line inversion signal (RVS) as a data signal and having a common voltage fixed at the ground terminal and for displaying the data signal by gate driving signals (dummy_gate1 to dummy_gate3);

상기 더미 화소(10, 20, 30) 가운데 첫 번째 화소(10)의 액정 커패시터(Q1)에 충전된 전압을 기준 전압으로 하여 두 번째 화소(20)의 액정 커패시터(Q2)에 충전된 전압과 비교하기 위한 비교기(40)와;A voltage charged in the liquid crystal capacitor Q1 of the first pixel 10 among the dummy pixels 10, 20 and 30 is compared with a voltage charged in the liquid crystal capacitor Q2 of the second pixel 20 as a reference voltage, A comparator (40)

상기 두 번째 화소(20)의 액정 커패시터(Q2)에 충전된 전압을 기준 전압으로 하여 세 번째 화소(30)의 액정 커패시터(Q3)에 충전된 전압과 비교하기 위한 비교기(50)와;A comparator 50 for comparing the voltage charged in the liquid crystal capacitor Q2 of the second pixel 20 with the voltage charged in the liquid crystal capacitor Q3 of the third pixel 30 as a reference voltage;

상기 비교기(40, 50)의 출력 신호(out1, out2)를 상기 라인 반전 신호(RVS)에 의해 선택하기 위한 멀티플렉서(60)를 포함하여 이루어져 있다.And a multiplexer 60 for selecting output signals out1 and out2 of the comparators 40 and 50 by the line inversion signal RVS.

상기와 같이 구성되어 있는 이 발명의 실시예에 따른 공통 전압 자동 조절 장치의 동작은 다음과 같다.The operation of the common voltage automatic control apparatus according to the embodiment of the present invention constructed as above is as follows.

이 발명을 구현하기 위하여, 액정 표시 장치 패널의 블랙 매트릭스(Black Matrix) 부분에 뷰 에리어(View Area)의 실제 화소와 동일한 조건하에서 동작하는 더미 화소(10, 20, 30)를 만들어준다. 그리고 상기 더미 화소의 공통 전압을 접지 전압으로 고정하고 데이터 신호로써 도 2에 도시되어 있는 바와 같은 라인 반전 신호(RVS)를 인가한다. 여기서, 상기 라인 반전 신호(RVS)의 레벨은 실제 화소에 입력되는 데이터와 동일한 전압 레벨로 유지되고 위상은 실제 데이터의 위상보다 앞선 위상으로 유지되도록 한다.In order to realize the present invention, dummy pixels 10, 20, and 30, which operate under the same conditions as the actual pixels of the view area, are formed in the black matrix portion of the liquid crystal display panel. The common voltage of the dummy pixel is fixed at the ground voltage and the line inversion signal RVS as shown in Fig. 2 is applied as a data signal. Here, the level of the line inversion signal RVS is maintained at the same voltage level as the data input to the actual pixel, and the phase is maintained in a phase higher than the phase of the actual data.

다음에, 상기 이웃하는 더미 화소의 액정에 충전된 전압을 비교기(40, 50)를 통해 서로 비교하고, 멀티플렉서(60)에서는 각 비교된 신호(out1, out2)를 입력받아 라인 반전 신호(RVS)의 주기로 1H마다 반전되는 하이 레벨과 로우 레벨의 신호(OUTRVS)를 출력하여, 이를 실제 화소의 공통 전압으로 사용할 수 있도록 한다.Next, the voltages charged in the liquid crystal of the neighboring dummy pixels are compared with each other via the comparators 40 and 50. The multiplexer 60 receives the compared signals out1 and out2 and receives the line inversion signals RVS, Level and low-level signals OUTRVS that are inverted every 1H in a period of a period of " 1 "

이렇게 함으로써 얻을 수 있는 이 발명의 효과는, 공통 전압(Vcom)을 1필드 화소 충전 전압값과 2필드 화소 충전 전압값의 중심에 위치하도록 자동으로 조절함으로써, 1필드의 화소 충전 전압값과 2필드의 화소 충전 전압값이 동일하게 할 수 있다는 것이다.The effect of the present invention thus obtained is that the common voltage Vcom is automatically adjusted to be located at the center of the 1-field pixel charging voltage value and the 2-field pixel charging voltage value, The pixel charge voltage value of the pixel can be made equal.

Claims (1)

라인 반전 신호를 데이터 신호로 입력받고 공통 전압이 접지단에 고정되어 있으며, 게이트 구동 신호에 의해 상기 데이타 신호를 표시하기 위한 다수의 더미 화소와;A plurality of dummy pixels for receiving a line inversion signal as a data signal and a common voltage fixed at a ground terminal and for displaying the data signal by a gate driving signal; 상기 다수의 더미 화소 가운데 첫 번째 화소의 액정 커패시터에 충전된 전압을 기준 전압으로 하여 두 번째 화소의 액정 커패시터에 충전된 전압과 비교하기 위한 제1 비교기와;A first comparator for comparing a voltage charged in a liquid crystal capacitor of a first pixel among the plurality of dummy pixels with a voltage charged in a liquid crystal capacitor of a second pixel as a reference voltage; 상기 두 번째 화소의 액정 커패시터에 충전된 전압을 기준 전압으로 하여 세 번째 화소의 액정 커패시터에 충전된 전압과 비교하기 위한 제2 비교기와;A second comparator for comparing the voltage charged in the liquid crystal capacitor of the second pixel with the voltage charged in the liquid crystal capacitor of the third pixel as a reference voltage; 상기 제1, 제2 비교기의 출력 신호를 상기 라인 반전 신호에 의해 선택하기 위한 멀티플렉서를 포함하여 이루어져 있는 공통 전압 자동 조절 장치.And a multiplexer for selecting an output signal of the first and second comparators by the line inversion signal.
KR1019960036721A 1996-08-30 1996-08-30 Apparatus for automatically adjusting common voltage KR100419088B1 (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3930992B2 (en) * 1999-02-10 2007-06-13 株式会社日立製作所 Drive circuit for liquid crystal display panel and liquid crystal display device
KR100687323B1 (en) * 1999-06-28 2007-02-27 비오이 하이디스 테크놀로지 주식회사 LCD line inversion Vcom circuit
KR100861270B1 (en) * 2001-12-24 2008-10-01 엘지디스플레이 주식회사 Liquid crystal display apparatus and mehtod of driving the same
KR100527089B1 (en) * 2002-11-04 2005-11-09 비오이 하이디스 테크놀로지 주식회사 Common voltage regulating circuit of liquid crystal display device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0611731A (en) * 1992-06-25 1994-01-21 Sony Corp Active matrix liquid crystal display device
JPH0611812Y2 (en) * 1985-02-26 1994-03-30 東京電気株式会社 Paper guide mechanism of printing machine
JPH06202157A (en) * 1992-12-25 1994-07-22 Sony Corp Active matrix type liquid crystal display device
JPH06337657A (en) * 1993-05-31 1994-12-06 Toshiba Corp Liquid crystal display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0611812Y2 (en) * 1985-02-26 1994-03-30 東京電気株式会社 Paper guide mechanism of printing machine
JPH0611731A (en) * 1992-06-25 1994-01-21 Sony Corp Active matrix liquid crystal display device
JPH06202157A (en) * 1992-12-25 1994-07-22 Sony Corp Active matrix type liquid crystal display device
JPH06337657A (en) * 1993-05-31 1994-12-06 Toshiba Corp Liquid crystal display device

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