KR100304912B1 - Structure and Driving Method of LCD - Google Patents

Structure and Driving Method of LCD Download PDF

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Publication number
KR100304912B1
KR100304912B1 KR1019930031544A KR930031544A KR100304912B1 KR 100304912 B1 KR100304912 B1 KR 100304912B1 KR 1019930031544 A KR1019930031544 A KR 1019930031544A KR 930031544 A KR930031544 A KR 930031544A KR 100304912 B1 KR100304912 B1 KR 100304912B1
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South Korea
Prior art keywords
liquid crystal
crystal display
display device
driving
common electrode
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KR1019930031544A
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Korean (ko)
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KR950019850A (en
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김태훈
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엘지.필립스 엘시디 주식회사
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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
    • G09G3/3614—Control of polarity reversal in general
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/121—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits

Abstract

PURPOSE: A structure of a liquid crystal display and a method of driving the liquid crystal display are provided to drive the liquid crystal display without adding a circuit to the display and simplify a liquid crystal display driving circuit. CONSTITUTION: Two common electrodes of a liquid crystal display are formed in the column direction to enable multiple gray scales. A liquid crystal display driver includes a controller(11) for receiving a control signal from a personal computer or a system, and a common voltage and level shifter(12) for providing common electrode voltage and shifting a level under the control of the controller. The driver further includes a gate driver(13) operating under the control of the controller, an upper and lower drivers operating with the signal provided by the common voltage and level shifter, and a liquid crystal display(14) operating according to the signal provided by the gate driver.

Description

액정표시소자의 구조 및 구동방법{omitted}Structure and Driving Method of Liquid Crystal Display Device

본 발명은 액정표시소자의 구조 및 구동방법에 관한 것으로, 공통전극의 구조 및 그에 따른 액정표시소자 구동방법에 관한 것이다.The present invention relates to a structure and a driving method of a liquid crystal display device, and more particularly to a structure of a common electrode and a method of driving a liquid crystal display device.

일반적으로, 액정표시소자의 구동은 액정의 열화를 방지하기 위해 한 개의 화소를 기준으로 필드에 따라 (+),(-) 신호를 번갈아 거는 교류구동으로 이루어진다.In general, the driving of the liquid crystal display device is composed of alternating current (AC) driving alternating (+) and (-) signals in accordance with a field in order to prevent deterioration of the liquid crystal.

또한, 액정표시소자의 구동방법으로는 라인반전, 및 도트 반전 액정표시소자 구동방법이 있다.In addition, the driving method of the liquid crystal display device includes a line inversion and a dot inversion liquid crystal display device driving method.

제1도는 종래의 라인반전형 액정표시소자 구동방법 설명도이고, 제2도는 종래의 칼럼(Column)반전형 액정표시소자 구동방법 설명도이고, 제3도는 종래의 도트(Dot)반전형 액정표시소자 구동방법 설명도이다.1 is an explanatory view of a conventional method of driving a line inverted liquid crystal display device, and FIG. 2 is an explanatory view of a conventional method of driving a column inverted liquid crystal display device, and FIG. 3 is a conventional dot inverted liquid crystal display device. It is explanatory drawing of an element drive method.

첫번째, 라인반전형 액정표시소자 구동방법은 제1도에 도시한 바와 같이 게이트라인에 따라서 데이타신호로 (+)신호와 (-)신호를 번갈아 인가하여 구동시키는 것으로, 현재 샤프 8.4인치 TFT-LCD(Sharp 8.4 Inch Thin Film Transister-Liquid Crystal Dis -play)에 사용되며, TFT-LCD의 공통전구에 한 라인의 데이타 전송기간(1H)을 간격으로 교류를 인가하므로 라인단위로 전압의 극성이 반전되도록 한다.First, as shown in FIG. 1, the line inversion type liquid crystal display device driving method is driven by alternately applying a positive signal and a negative signal to a data signal according to a gate line. It is used for (Sharp 8.4 Inch Thin Film Transister-Liquid Crystal Dis-play), and the polarity of the voltage is inverted line by line because it applies alternating current of one line of data transmission period (1H) to the common bulb of TFT-LCD. do.

두번째, 칼럼반전형 액정표시소자 구동방법은 제2도에 도시한 바와 같이 데이타라인에 따라서 데이타신호로 (+)신호와 (-)신호를 번갈아 인가하여 데이타라인의 화소에 인가되는 전압의 극성이 반전되도록 하는 것으로, 현재 도시바 9.5인치 TFT-LCD(Toshiba 9.5 Inch Thin Film Transister-Liquid Crystal Display)에 사용된다.Second, in the method of driving the column inverted liquid crystal display, as shown in FIG. 2, the polarity of the voltage applied to the pixels of the data line is changed by alternately applying the (+) signal and the (-) signal to the data signal according to the data line. It is currently used in Toshiba 9.5 Inch Thin Film Transister-Liquid Crystal Display (TFT-LCD).

칼럼반전형 액정표시소자 구동방법에 의해 구현되는 TFT-LCD의 공통전극에진류전압을 인가하고 데이타라인에 인가되는 전압은 한 필드를 기준으로 교류로 인가하는데, 상,하쪽 드라이버에 인가되는 데이타전압들이 서로 반전되어 공급되어 데이타라인의 화소에 인가되는 전압의 극성이 서로 반대로 되도록 한다.A voltage applied to the common electrode of the TFT-LCD implemented by the column inverting liquid crystal display device driving method and a voltage applied to the data line by AC based on one field, which is applied to the upper and lower drivers. They are supplied inverted to each other so that the polarities of the voltages applied to the pixels of the data line are reversed.

세번째, 도트반전형 액정표시소자 구동방법은 제3도에 도시한 바와 같이 라인반전방법과 칼럼반전 방법을 결합시킨 구동방법으로 한 화소에 인접한 주위의 화소들의 극성이 반전되어 필드단위로 극성이 바뀌며, 앞서 설명한 라인반전 방법 및 칼럼반전 방법보다 화질이 뛰어나다.Third, the dot inversion type liquid crystal display device driving method is a driving method in which the line inversion method and the column inversion method are combined as shown in FIG. 3, and the polarities of neighboring pixels adjacent to one pixel are inverted so that the polarity is changed in units of fields. The image quality is superior to the line inversion method and the column inversion method described above.

제4도는 종래의 액정표시소자 상부기판의 공통전극 구조도이다.4 is a structure diagram of a common electrode of a conventional upper substrate of a liquid crystal display.

종래의 액정표시소자의 상부기판은 제4도에 도시한 바와 같이 전면에 공통전극이 도포되어 있어 구동에 제약을 받으며 액정의 열화를 방지하기 위해 화소에 인가되는 전압을 일정시간 동안 플릭커(Flicker)가 발생하지 않도록 데이타전압의 극성을 번갈아 인가해야 한다.As shown in FIG. 4, the upper substrate of the conventional liquid crystal display device is coated with a common electrode on the front surface thereof, thereby being restricted from driving and applying a voltage applied to the pixel for a predetermined time to prevent deterioration of the liquid crystal. The polarity of the data voltage should be applied alternately to prevent the occurrence of.

따라서 종래의 액정표시소자에서는 공통전극의 구조 때문에 8계조 디지탈 드라이버를 구동하기 위해서 공통전압(Vcom)을 직류로 인가하면 16개의 전압레벨회로가 필요해지고, 16개조 디지탈 드라이버를 구동하기 위해서 32개의 전압레벨회로가 필요해지므로 구동회로가 복잡해지고 비효율적으로 부품수가 많아지는 문제점이 있었다. 상기 문제점을 개선하기 위해 본 발명은 구동하고자 하는 구동방식에 맞춰 공통전극을 설계하여 구동회로를 간략화하고 크로스토크(Crosstolk) 및 잔상을 줄이기 위한 액정표시소자의 공통전극 구조 및 그에 따른 구동방법을 제공함에 그 목적이 있다. 상기 목적을 달성하기 위해 본 발명은 각각의 동일위상의 신호가 인가되는 방향으로 제1 및 제2 공통전극을 도포하여 형성하는 것을 특징으로 한다.Therefore, in the conventional liquid crystal display device, because of the structure of the common electrode, when the common voltage Vcom is applied as a direct current to drive the eight gray scale digital drivers, 16 voltage level circuits are required, and 32 voltages are used to drive the 16 gray scale digital drivers. Since the level circuit is required, the driving circuit is complicated and the number of parts is inefficient. In order to solve the above problems, the present invention provides a common electrode structure of a liquid crystal display device for simplifying a driving circuit, reducing crosstalk and afterimage by designing a common electrode according to a driving method to be driven, and a driving method thereof. Has its purpose. In order to achieve the above object, the present invention is characterized by forming the first and second common electrodes in a direction in which the signals of the same phase are applied.

이하, 첨부한 도면을 참조하여 본 발명의 일실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

제5도는 본 발명에 의한 액정표시소자의 공통전극 구조도이고, 제6도는 본 발명의 도트반전형 액정표시소자 구동방법 설명도이고, 제7도는 본 발명이 적용된 액정표시소자의 구동장치의 구성도이다.5 is a structural diagram of a common electrode of a liquid crystal display device according to the present invention, FIG. 6 is a diagram illustrating a method of driving a dot inverted liquid crystal display device according to the present invention, and FIG. 7 is a configuration diagram of a driving device of a liquid crystal display device to which the present invention is applied. to be.

본 발명에 의한 액정표시소자의 공통전극은 제5에 도시한 바와 같이 각각의 동일위상의 신호가 인가되는 방향, 즉 칼럼방향으로 2개의 공통전극(1,2)을 도포하여 형성하므로, 다계조 표시를 가능하게 한다.The common electrode of the liquid crystal display according to the present invention is formed by applying two common electrodes 1 and 2 in a direction in which signals of the same phase are applied, that is, in a column direction, as shown in FIG. Enable display.

또한 액정표시소자의 공통전극은 각각의 동일위상의 신호가 인가되는 방향, 즉 라인방향으로 2개의 공통전극(1,2)을 도포하여 형성한다.In addition, the common electrode of the liquid crystal display is formed by coating two common electrodes 1 and 2 in a direction in which signals of the same phase are applied, that is, in a line direction.

또한 액정표시소자의 공통전극은 각각의 동일위상의 신호가 인가되는 것을 화소단위로 하여 2개의 공통전극(1,2)을 도포하여 형성한다.In addition, the common electrode of the liquid crystal display device is formed by coating two common electrodes 1 and 2 on a pixel basis to which signals of the same phase are applied.

상기 공통전극(1,2)은 각각 반전된 위상의 신호가 인가되어 라인방향, 칼럼방향, 또는 화소단위로 동일한 위상의 신호가 전달된다.The signals of the inverted phase are respectively applied to the common electrodes 1 and 2 so that the signals of the same phase are transmitted in the line direction, column direction, or pixel unit.

본 발명이 적용된 액정표시소자의 구동장치는 제7도에 도시한 바와 같이 PC(personal Computer) 또는 시스템으로부터 제어신호를 수신하는 콘트롤러(11), 상기 콘트롤러(11)의 제어에 따라 공통전극전압(Vcom)을 공급하고 레벨을 쉬프트시키는 공통전압 및 레벨쉬프트부(12), 상기 콘트롤러(11)의 제어에 따라 동작하는 게이트 드라이버(13), 및 상기 공통전압 및 레벨쉬프트부(12)로 부터 공급되는 신호에 동작하는 상하위 드라이버와 게이트드라이버(13)로 부터 공급되는 신호에 따라 동작하는 액정표시소자(14)로 구성된다.The driving apparatus of the liquid crystal display device to which the present invention is applied includes a controller 11 for receiving a control signal from a personal computer (PC) or a system as shown in FIG. 7, and a common electrode voltage according to the control of the controller 11. Vcom) is supplied from the common voltage and level shift unit 12 for supplying the shifted level, the gate driver 13 operating under the control of the controller 11, and the common voltage and level shift unit 12. It consists of a liquid crystal display element 14 operating in accordance with the signal supplied from the gate driver 13 and the upper and lower drivers to operate the signal.

PC 또는 시스템으로 부터 출력되는 제어신호는 콘트롤러(11)를 통해 게이트드라이버(13)와 상하위 드라이버로 전달되어 액정표시소자(14)의 각 화소에 공통전극전압(Vcom)을 공급하게 된다.The control signal output from the PC or the system is transmitted to the gate driver 13 and the upper and lower drivers through the controller 11 to supply the common electrode voltage Vcom to each pixel of the liquid crystal display device 14.

도트반전형 액정표시소자의 구동방법은 제5도와 같은 공통전극 구조를 갖는 액정표시소자에 제6도에 도시한 바와 같이 라인반전 방식을 적용하면 도트반전 액정표시소자의 구동을 이룰수 있다.In the method of driving a dot inversion liquid crystal display device, when the line inversion method is applied to a liquid crystal display device having a common electrode structure as shown in FIG. 5 as shown in FIG. 6, the dot inversion liquid crystal display device can be driven.

라인방향으로 공통전극이 도포된 라인반전 액정표시소자 구동회로에 하나의 멀티플렉서를 추가하여 2개의 공통전극전압(Vcom)을 공급하면 도트반전방식을 구현할수 있으며, 16개의 레벨교류 회로를 8개의 레벨교류 회로로 간략화 할수 있다.The dot inversion method can be realized by supplying two common electrode voltages (Vcom) by adding one multiplexer to the line inversion liquid crystal display device driving circuit coated with the common electrode in the line direction. It can be simplified by AC circuit.

또한 제2도의 칼럼반전형 액정표시소자 구동회로의 경우 공통전극전압(Vcom)을 제6도에 도시한 바와 같이 서로 반전시켜 주기를 필드단위로 늘려주고 도트레벨전압 또한 주기를 필드단위로 늘려서 8개의 교류신호를 공급해 주면 칼럼반전 방식을 구현할수 있다.In addition, in the case of the column inverted liquid crystal display device driving circuit of FIG. 2, the common electrode voltage Vcom is inverted from each other as shown in FIG. 6 to increase the period in field units and to increase the dot level voltage in field units. If two AC signals are supplied, the column inversion method can be realized.

즉, 공통전압 및 레벨쉬프트부(12)에서 위상이 반전된 공통전압 회로만을 생성하여 서로 다른 공통전극에 인가하여 라인반전, 도트반전, 및 칼럼반전의 구동방식을 별도의 회로 추가 없이 구현할수 있고, 공통전극을 상하, 좌우, 및 상하좌우로 나누는 경우에도 적용시킬수 있다.That is, only the common voltage circuit whose phase is inverted in the common voltage and the level shift unit 12 is generated and applied to different common electrodes to implement the driving method of line inversion, dot inversion, and column inversion without additional circuit. It is also applicable to the case where the common electrode is divided into up, down, left, right, up, down, left and right.

상기와 같이 구성되어 동작하는 본 발명은 회로의 추가 없이 액정표시소자를 구동시킬수 있고, 그레이 레벨쉬프트 회로를 반으로 줄일수 있는 효과가 있고 액정의 열화를 방지하기 위한 모든 구동장치에 적용가능 하다.The present invention configured and operated as described above can drive a liquid crystal display without adding a circuit, can reduce the gray level shift circuit in half, and can be applied to any driving apparatus for preventing deterioration of liquid crystal.

제1도는 종래의 라인반전형 액정표시소자 구동방법 설명도1 is an explanatory diagram of a conventional method for driving a line inverting liquid crystal display device.

제2도는 종래의 칼럼반전형 액정표시소자 구동방법 설명도2 is an explanatory diagram of a conventional method of driving a column inverting liquid crystal display device.

제3도는 종래의 도트반전형 액정표시소자 구동방법 설명도3 is an explanatory view of a conventional dot inversion type liquid crystal display device driving method

제4도는 종래의 액정표시소자 상부기판의 공통전극 구조도4 is a structural diagram of a common electrode of a conventional upper substrate of a liquid crystal display device

제5도는 본 발명에 의한 액정표시소자의 공통전극 구조도5 is a structural diagram of a common electrode of a liquid crystal display device according to the present invention.

제6도는 본 발명의 도트반전형 액정표시소자 구동방법 설명도6 is an explanatory diagram of a method of driving a dot inverted liquid crystal display device according to the present invention.

제7도는 본 발명이 적용된 액정표시소자의 구동장치의 구성도7 is a configuration diagram of a driving device of a liquid crystal display device to which the present invention is applied.

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

1,2 : 공통전극 11 : 콘트롤러1,2 common electrode 11 controller

12 : 공통전압 및 레벨쉬프트부 13 : 게이트드라이버12: common voltage and level shift unit 13: gate driver

14 : 액정표시소자14 liquid crystal display element

Claims (5)

(정정) 각각의 동일위상의 신호가 인가되는 방향으로 제1 및 제2 공통전극을 형성하는 것을 특징으로 하는 액정표시소자의 구조.(Correction) A structure of a liquid crystal display device characterized by forming first and second common electrodes in a direction in which signals of the same phase are applied to each other. (정정) 제1항에 있어서,(Correction) The method according to claim 1, 상기 제1 및 제2 공통전극은 라인(line)방향으로 형성됨을 특징으로 하는 액정표시소자의 구조.And the first and second common electrodes are formed in a line direction. (정정) 제1항에 있어서,(Correction) The method according to claim 1, 상기 제1 및 제2 공통전극은 칼럼(Column) 방향으로 형성됨을 특징으로 하는 액정표시소자의 구조.Wherein the first and second common electrodes are formed in a column direction. (정정) 제1항에 있어서,(Correction) The method according to claim 1, 상기 제1 및 제2 공통전극은 화소단위로 형성됨을 특징으로 하는 액정표시소자의 구조.The first and second common electrodes are structured in pixel units. 각각의 동일위상 신호가 인가되는 방향으로 제1 및 제2 공통전극이 형성된 액정표시소자에 있어서, 제1및 제2공통전극에 각각 반전된 위상의신호를 인가하여 단계조 표시하는 것을 특징으로 하는 액정표시소자의 구동방법.A liquid crystal display device in which first and second common electrodes are formed in a direction in which each of the same phase signals are applied, wherein a phase signal is displayed by applying an inverted phase signal to the first and second common electrodes, respectively. A method of driving a liquid crystal display device.
KR1019930031544A 1993-12-30 1993-12-30 Structure and Driving Method of LCD KR100304912B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7319448B2 (en) 2003-06-27 2008-01-15 Lg.Philips Lcd Co., Ltd. Liquid crystal display device and method for driving the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883227A (en) * 1972-06-05 1975-05-13 Ise Electronics Corp Liquid crystal display devices
US5233449A (en) * 1990-11-07 1993-08-03 Sharp Kabushiki Kaisha Liquid-crystal color display with comb-shaped pixel electrodes partially overlapping at the electrode ends

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883227A (en) * 1972-06-05 1975-05-13 Ise Electronics Corp Liquid crystal display devices
US5233449A (en) * 1990-11-07 1993-08-03 Sharp Kabushiki Kaisha Liquid-crystal color display with comb-shaped pixel electrodes partially overlapping at the electrode ends

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7319448B2 (en) 2003-06-27 2008-01-15 Lg.Philips Lcd Co., Ltd. Liquid crystal display device and method for driving the same

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