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KR970076456A - Multi-line selection using pulse width modulation Large-bending nematic liquid crystal display (STN-LCD) driving circuit with voltage application method - Google Patents

Multi-line selection using pulse width modulation Large-bending nematic liquid crystal display (STN-LCD) driving circuit with voltage application method Download PDF

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Publication number
KR970076456A
KR970076456A KR1019960016092A KR19960016092A KR970076456A KR 970076456 A KR970076456 A KR 970076456A KR 1019960016092 A KR1019960016092 A KR 1019960016092A KR 19960016092 A KR19960016092 A KR 19960016092A KR 970076456 A KR970076456 A KR 970076456A
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KR
South Korea
Prior art keywords
voltage
liquid crystal
line
pulse width
crystal display
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
KR1019960016092A
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Korean (ko)
Inventor
김재훈
권오경
이재평
Original Assignee
엄길용
오리온전기 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1019960016092A priority Critical patent/KR970076456A/en
Priority to PCT/KR1996/000228 priority patent/WO1997043750A1/en
Priority to JP9540752A priority patent/JPH11510622A/en
Publication of KR970076456A publication Critical patent/KR970076456A/en
Abandoned legal-status Critical Current

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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
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3625—Control of matrices with row and column drivers using a passive matrix using active addressing
    • 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
    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3692—Details of drivers for data electrodes suitable for passive matrices only
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2230/00—Details of flat display driving waveforms

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

Abstract

본 발명은 전압 구동용 평면 표시기의 구동 회로부에 적용되는 펄스 폭 변조를 이용한 다중 라인 선택 전압 인가 방식의 STN-LCD 구동 회로에 관한 것으로서, 특히 STN-LCD 패널의 컬럼 라인에 인가되는 전압을, 전압의 크기가 아닌 펄스의 폭을 변조하여 인가할 수 있도록 하여 2개의 전압 준위를 사용해 전압을 인가하므로써, LCD 구동회로를 간단화 시키는 잇점이 있다.The present invention relates to an STN-LCD driving circuit using a multi-line selection voltage applying method using pulse width modulation applied to a driving circuit portion of a voltage driving flat panel display, It is advantageous to simplify the LCD driving circuit by applying the voltage using the two voltage levels so that the width of the pulse can be modulated and applied.

Description

펄스 폭 변조를 이용한 다중 라인 선택 전압 인가 방식의 큰휨 네마틱 액정 표시기(STN-LCD)구동 회로Multi-line selection using pulse width modulation Large-bending nematic liquid crystal display (STN-LCD) driving circuit with voltage application method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제7도는 본 발명에 의해 구현된 액정 표시기 구동 회로를 나타내는 블럭도, 제8도는 본 발명에 따른 클럭 회로부의 출력 타이밍을 나타내는 타이밍도.FIG. 7 is a block diagram showing a liquid crystal display driving circuit implemented by the present invention; FIG. 8 is a timing chart showing output timings of a clock circuit unit according to the present invention;

Claims (4)

복수개의 컬럼 라인과, 복수개의 로우 라인, 및 상기 컬럼 라인과 로우 라인이 상호 교차하는 지점에 형성된 각각의 화소들을 포함하는 액정 표시기에 있어서, 디스플레이 할 데이타와 직교함수의 익스클루시브오아 연산된 값을 누적하는 덧셈부(205)에서 출력된 값을 입력받아 펄스 폭 변조할 수 있는 상태의 값으로 디코딩 하는 디코더부(206)와; 상기 디코더부(206)에서 변조된 값을 순차적으로 저장하는 제1버퍼(207)와; 상기 제1버퍼(207)에 연산하고자 하는 컬럼 라인에 대한 값들이 모두 저장되면 그 값을 한꺼번에 재 저장하는 제2버퍼(208)와; 상기 제2버퍼(208)에 저장된 값을 한 비트씩 선택적으로 출력하는 먹스부(209)와; 상기 먹스부(209)에 의해 선택된 컬럼 라인에, 준비된 전압 준위를 제공할 수 있도록 제2게이트부(211) 내에서 상기 선택된 컬럼 라인에, 대응되는 게이트를 턴-온 시키는 T-플립플롭부(210)와; 컬럼 라인에 인가하는 두 개의 전압 전위 값이 셋팅되어 있으며, 상기 T-플립플롭부(210)의 동작에 따라 턴-온된 게이트에 연결되어 컬럼라인에 전압을 인가하는 전압소스부(212)와; 상기 각 버퍼(207,208)와 선택 스위치(214)에 기준 클럭을 제공하는 클럭 회로부(213)를 포함하여 이루어져, 두 개의 전압 준위를 사용해 컬럼 라인에 전압을 제공하는 것을 특징으로 하는 펄스 폭 변조를 이용한 다중 라인 선택 전압 인가 방식의 큰 휨 네마틱 액정 표시기(STN-LCD)구동 회로.1. A liquid crystal display comprising a plurality of column lines, a plurality of row lines, and respective pixels formed at intersections of the column lines and the row lines, characterized in that the data to be displayed and the calculated value of the orthogonal function A decoder unit 206 for receiving the value output from the adder 205 and decoding the received value into a value of a state capable of pulse width modulation; A first buffer 207 for sequentially storing the values modulated by the decoder unit 206; A second buffer 208 for storing the values of the column lines to be operated on in the first buffer 207 at once; A multiplexer 209 for selectively outputting the value stored in the second buffer 208 by one bit; A T-flip-flop (not shown) for turning on the corresponding gate in the selected column line in the second gate 211 so as to provide a prepared voltage level to the column line selected by the mux 209 210; A voltage source 212 for setting two voltage potentials to be applied to the column line and connected to the gate of the T-flip-flop 210 according to the operation of the T-flip-flop 210 to apply a voltage to the column line; And a clock circuit unit 213 for providing a reference clock to each of the buffers 207 and 208 and the selection switch 214 to provide a voltage to a column line using two voltage levels. A large bending nematic liquid crystal display (STN-LCD) driving circuit with multiple line selection voltage application. 제1항에 있어서, 상기 클러 회로부(213)는 제1버퍼부의 인에이블 동작과 제2버퍼부의 인에이블 동작을 순차적으로 제어하여, 연산량 증가에 따른 액정 표기시 구동 회로의 속도 저하를 방지하는 것을 특징으로 하는 펄스 폭 변조를 이용한 다중 라인 선택 전압 인가 방식의 큰 휨 네마틱 액정 표시기(STN-LCD)구동 회로.2. The liquid crystal display device according to claim 1, wherein the clock circuit portion (213) sequentially controls the enable operation of the first buffer portion and the enable operation of the second buffer portion to prevent a decrease in the speed of the liquid crystal notation drive circuit A large bending nematic liquid crystal display (STN-LCD) drive circuit with multi-line selection voltage application using pulse width modulation. 제1항에 있어서, 상기 전압소스부(212)에는 두 개의 전압 준위값이 셋팅되어 있으며, 상기 전압 준위의 펄스 폭을 변조하여 컬럼 라인에 인가되는 전압의 크기를 결정하는 것과, 로우 라인에 인가되는 전압의 크기를 결정하는 것과, 타임 인터발을 끊는 갯수를 결정하는 것은 하기 식에 의해 결정되는 것을 특징으로 하는 펄스 폭 변조를 이용한 다중 라인 선택 전압 인가 방식의 큰 휨 네마틱 액정 표시기(STN-LCD) 구동 회로.The plasma display apparatus of claim 1, wherein the voltage source unit (212) has two voltage level values, the pulse width of the voltage level is modulated to determine the magnitude of a voltage applied to the column line, And the number of times of interrupting the time-interrupting is determined by the following equation: STN-LCD (large-scale nematic liquid crystal display) with a multi-line selection voltage application using pulse width modulation ) Drive circuit. (상기 식에서 F는 로우 라인 신호의 크기, N은 상기 로우 라인의 전체 갯수, S는 한번체 선택되는 상기 로우 라인의 갯수, eF는 컬럼 라인 신호의 크기, L은 상기 시간간격 τ동안에 컬럼 라인에 인가되는 전압이 변조될 수 있는 시간 단위의 갯수, di는 상기 선택된 로우 라인에서 i번째의 로우 라인에 위치한 화소에 대한 데이타 신호를 나타냄.)Where S is the number of the row lines to be selected at one time, eF is the size of the column line signal, L is the number of column lines to be connected to the column line during the time interval?, And N is the total number of the row lines. The number of time units in which an applied voltage can be modulated and di represents a data signal for a pixel located in the i-th row line in the selected row line. 제3항에 있어서, 상기 식에서 로우 라인 군이 선택되지 않은 시간동안 화소에 인가되는 전압의 크기를 작게 해주기 위해, e의 값을 '0'과 '1' 사이의 값으로 한정하여 한 프레임 동안이 화소에 인가되는 실효치 전압에 미치는 영향을 작게 해주는 것을 특징으로 하는 펄스 폭 변조를 이용한 다중 라인 선택 전압 인가 방식의 큰 휨 네마틱 액정 표시기(STN-LCD)구동 회로.4. The method of claim 3, wherein in order to reduce the magnitude of the voltage applied to the pixel during the unselected time period of the row line group, the value of e is limited to a value between '0' and '1' (STN-LCD) driving circuit of a multi-line selection voltage application type employing pulse width modulation, characterized in that the effect on the effective voltage applied to the pixel is reduced. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960016092A 1996-05-15 1996-05-15 Multi-line selection using pulse width modulation Large-bending nematic liquid crystal display (STN-LCD) driving circuit with voltage application method Abandoned KR970076456A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019960016092A KR970076456A (en) 1996-05-15 1996-05-15 Multi-line selection using pulse width modulation Large-bending nematic liquid crystal display (STN-LCD) driving circuit with voltage application method
PCT/KR1996/000228 WO1997043750A1 (en) 1996-05-15 1996-11-30 Super-twisted nematic liquid crystal display driving circuit adopting multiple line selection method using pulse width modulation
JP9540752A JPH11510622A (en) 1996-05-15 1996-11-30 Super twisted nematic liquid crystal display driver circuit adopting multiple line selection method using pulse width modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960016092A KR970076456A (en) 1996-05-15 1996-05-15 Multi-line selection using pulse width modulation Large-bending nematic liquid crystal display (STN-LCD) driving circuit with voltage application method

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KR970076456A true KR970076456A (en) 1997-12-12

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JP (1) JPH11510622A (en)
KR (1) KR970076456A (en)
WO (1) WO1997043750A1 (en)

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EP1308019A2 (en) * 2000-07-31 2003-05-07 Koninklijke Philips Electronics N.V. Image-sensing display device
JP3632589B2 (en) * 2000-11-13 2005-03-23 セイコーエプソン株式会社 Display drive device, electro-optical device and electronic apparatus using the same
JP4232397B2 (en) 2002-06-17 2009-03-04 パナソニック株式会社 Information terminal with voice and information terminal system
JP4803711B2 (en) * 2005-08-25 2011-10-26 オンセミコンダクター・トレーディング・リミテッド Drive circuit for STN-LCD panel

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KR910001848B1 (en) * 1986-02-06 1991-03-28 세이꼬 엡슨 가부시끼가이샤 Image display
JP3145552B2 (en) * 1993-12-28 2001-03-12 セイコーインスツルメンツ株式会社 Liquid crystal display panel drive device

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JPH11510622A (en) 1999-09-14
WO1997043750A1 (en) 1997-11-20

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