KR930010837A - Drive circuit for display device with digital source driver that can generate multi-level driving voltage from one external power source - Google Patents

Drive circuit for display device with digital source driver that can generate multi-level driving voltage from one external power source Download PDF

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KR930010837A
KR930010837A KR1019920022056A KR920022056A KR930010837A KR 930010837 A KR930010837 A KR 930010837A KR 1019920022056 A KR1019920022056 A KR 1019920022056A KR 920022056 A KR920022056 A KR 920022056A KR 930010837 A KR930010837 A KR 930010837A
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circuit
voltage
display device
external power
power supply
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KR1019920022056A
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KR960016342B1 (en
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가오루 나까니시
고오이찌로 세이하라
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쯔지 하루오
샤프 가부시끼가이샤
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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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • 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
    • G09G3/3688—Details of drivers for data electrodes suitable for active 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
    • 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
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

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

Abstract

본 발명의 표시장치는 게이트 드라이버와 소오스 드라이버를 갖는다. 상기 소오스 드라이버는 시프트 레지스터, 샘플링 메모리, 홀드 메모리, 타이밍신호 발생회로, 전압제어회로, 및 커패시터와 스위치를 갖는 출력전압발생회로를 구비한다. 상기 타이밍신호발생회로는 각 수평기간마다 다른 펄스들을 갖는 타이밍신호들을 발생하며, 이 타이밍신호들의 수는 표시될 영상의 계조수에 좌우된다. 디지탈 영상신호와 타이밍신호들의 수신에 따라, 상기 전압제어회로는 각 수평기간마다 영상신호들의 내용에 따라 타이밍신호들중 하나를 선택하고 그 선택된 타이밍신호의 펄스폭에 상응하는 기간동안 소정 레벨로 제어신호를 출력한다. 출력전압발생회로의 커패시터는 제어신호가 스위치에 의해 수신되는 동안 외부전원전압으로 충전되어, 구동전압이 발생되게 된다. 상기 외부 전원전압은 시간의 경과에 따라 높아지는 전위를 제공하는 외부전원으로부터 공급된다.The display device of the present invention has a gate driver and a source driver. The source driver includes a shift register, a sampling memory, a hold memory, a timing signal generation circuit, a voltage control circuit, and an output voltage generation circuit having a capacitor and a switch. The timing signal generation circuit generates timing signals having different pulses in each horizontal period, and the number of these timing signals depends on the number of gray levels of the image to be displayed. Upon reception of the digital video signal and the timing signals, the voltage control circuit selects one of the timing signals in accordance with the contents of the video signals in each horizontal period and controls it to a predetermined level for a period corresponding to the pulse width of the selected timing signal. Output the signal. The capacitor of the output voltage generating circuit is charged with an external power supply voltage while the control signal is received by the switch, thereby generating a driving voltage. The external power supply voltage is supplied from an external power supply that provides a potential that increases with time.

Description

한 외부전원으로부터 다계조의 구동전압을 발생할 수 있는 디지탈 소오스 드라이버를 구비한 표시장치용 구동회로Drive circuit for display device with digital source driver that can generate multi-level driving voltage from one external power source

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 1실시예에 따른 게이트 드라이버와 소오스 드라이버를 포함하는 구동회로를 갖는 매트릭스형 액청표시장치(TFT LCD 모듈)의 블록도,1 is a block diagram of a matrix type liquid crystal display device (TFT LCD module) having a driving circuit including a gate driver and a source driver according to an embodiment of the present invention;

제2도는 제1도에 보인 소오스 드라이버의 전체 시스템의 블록도.2 is a block diagram of the entire system of source drivers shown in FIG.

Claims (9)

주사전극에 주사펄스들을 공급하기 위해 표시장치의 주사전극에 연결되는 게이트 드라이버 및 표시장치의 신호전극에 접속되는 소오스 드라이버를 포함하고 입력된 소정 비트수의 디지탈영상신호에 따라 다계조의 구동전압을 출력하기 위한 표시장치용 구동회로에 있어서, 상기 소오스 드라이버는, 각 수평기간마다의 클록펄스들에따라 상이한 펄스폭들을 갖는 소정수의 타이밍 신호를 발생하고, 상기 타이밍신호들의 수는 영상의 계조수에 상응하는, 타이밍신호 발생회로, 상기 디지탈 영상신호와 타이밍 신호를 받아, 각 수평기간마다 상기 디지탈 영상신호의 내용에 따라 상기 타이밍신호중 하나를 선택하고, 선택된 타이밍신호의 펄스폭에 상당하는 기간동안 소정레벨의 제어신호를 출력하기 위한 전압제어회로, 및 커패시터와 제1스위치수단을 구비하며, 외부전원전압을 받아 각 수평기간마다 상기 전압제어회로로부터 소정레벨의 제어신호가 출력되고 있는 기간동안 상기 제1수위치수단을 통해 상기 외부 전원전압을 상기 커패시터에 충전하여 구동전압을 발생하기 위한 출력전압발생회로를 포함하는 것을 특징으로 하는 표시장치용 구동회로.A gate driver connected to the scan electrode of the display device and a source driver connected to the signal electrode of the display device for supplying the scan pulses to the scan electrode, and the driving voltage of the multi-gradation according to the input predetermined number of digital image signals In the display device driving circuit for outputting, the source driver generates a predetermined number of timing signals having different pulse widths according to clock pulses for each horizontal period, and the number of timing signals is the number of gray levels of the image. Corresponding to the timing signal generating circuit, receiving the digital video signal and the timing signal, selecting one of the timing signals according to the contents of the digital video signal for each horizontal period, and for a period corresponding to the pulse width of the selected timing signal. A voltage control circuit for outputting a control signal of a predetermined level, and a capacitor and a first switch means And generating a driving voltage by charging the external power voltage to the capacitor through the first male position means during a period in which a control signal having a predetermined level is output from the voltage control circuit in each horizontal period in response to an external power supply voltage. A drive circuit for a display device, comprising an output voltage generator circuit for performing the same. 제1항에 있어서, 상기 타이밍신호 발생회로는 그들의 요부에서 서로 반대 레벨로 되고 각각 수평기간마다 반전되는 출력스위칭 신호들을 발생하며, 상기 전압제어 회로는 디지탈영상신호, 타이밍신호 및 출력스위칭 신호들을 수신하여, 각 수평기간마다 상기 영상신호들과 출력스위칭 신호들의 내용에 따라 타이밍 신호들중 하나를 선택하고 그 선택된 타이밍신호의 펄스폭에 상당하는 시간동안 소정 레벨로 제어신호를 출력하는 것을 특징으로 하는 표시장치용 구동회로.2. The circuit of claim 1, wherein the timing signal generating circuits generate output switching signals that are at opposite levels in their main portions and are inverted each horizontal period, and the voltage control circuit receives the digital image signal, the timing signal, and the output switching signals. And selecting one of the timing signals in accordance with the contents of the video signals and the output switching signals in each horizontal period, and outputting the control signal at a predetermined level for a time corresponding to the pulse width of the selected timing signal. Drive circuit for display device. 제2항에 있어서, 상기 타이밍신호 발생회로는 복수의 D-플립플롭회로, AND 회로, NOR 회로 및 NAND 회로를 포함하는 제1부분과, 카운터, 인버터 및 복수의 D-플립플롭회로를 포함하는 제2부분을 구비하여, 상기 제1부분을 출력스위칭 신호들을 발생하고 상기 제2부분은 타이밍 신호들을 발생하는 것을 특징으로 하는 표시장치용 구동회로.3. The circuit of claim 2, wherein the timing signal generation circuit comprises a first portion comprising a plurality of D-flip flop circuits, an AND circuit, a NOR circuit, and a NAND circuit, and a counter, an inverter, and a plurality of D-flip flop circuits. And a second portion, wherein the first portion generates output switching signals and the second portion generates timing signals. 제1항에 있어서, 상기 출력전압발생회로는 2개의 커패시터를 구비하며 상기 2개의 커패시터들은 외부전원전압으로 번갈아 충전되며, 이에 따라 구동전압들이 발생되어 2개의 커패시터로부터 번갈아 출력되는 것을 특징으로 하는 표시장치용 구동회로.The display device of claim 1, wherein the output voltage generating circuit includes two capacitors, and the two capacitors are alternately charged with an external power supply voltage, and thus driving voltages are generated and alternately output from the two capacitors. Drive circuit for the device. 제4항에 있어서, 상기 출력전압발생회로는 교대로 상기 커패시티들로부터 구동전압을 출력하기 위한 제2스위치 수단을 구비하는 것을 특징으로 하는 표시장치용 구동회로.5. A drive circuit as claimed in claim 4, wherein said output voltage generation circuit is provided with second switch means for alternately outputting a drive voltage from said capacities. 제4항에 있어서, 상기 외부전원 전압은 시간의 경과에 따라 높아지는 전위를 제공하는 외부전원으로부터 공급되는 것을 특징으로 하는 표시장치용 구동회로.5. The driving circuit for a display device according to claim 4, wherein the external power supply voltage is supplied from an external power supply providing a potential that increases with time. 제2항에 있어서, 상기 출력전압발생회로는 2개의 커패시터를 구비하며 상기 2개의 커폐시터들은 외부전원전압으로 번갈아 충전되며, 이에 따라 구동전압들이 발생되어 상기 2개의 커패시터로부터 번갈아 출력되는 것을 특징으로 하는 표시장치용 구동회로.The method of claim 2, wherein the output voltage generating circuit has two capacitors, and the two capacitors are alternately charged with an external power supply voltage, and thus driving voltages are generated and alternately output from the two capacitors. Drive circuit for display device. 제7항에 있어서, 상기 출력전압발생회로는 타이밍신호발생회로로부터 수신된 출력스위칭 신호들의 상태에 따라, 교대로 상기 커패시터들로부터 구동전압을 출력하기 위한 제2스위치 수단을 구비하는 것을 특징으로 하는 표시장치용 구동회로.8. The output voltage generator circuit of claim 7, wherein the output voltage generator circuit includes second switch means for alternately outputting a driving voltage from the capacitors according to the state of the output switching signals received from the timing signal generator circuit. Drive circuit for display device. 제7항에 있어서, 상기 외부전원 전압은 시간의 경과에 따라 높아지는 전위를 제공하는 외부전원으로부터 공급되는 것을 특징으로 하는 표시장치용 구동회로.8. The driving circuit for a display device according to claim 7, wherein the external power supply voltage is supplied from an external power supply providing a potential that increases with time. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920022056A 1991-11-27 1992-11-21 Display module drive circuit KR960016342B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP91-312319 1991-11-27
JP3312319A JPH05150737A (en) 1991-11-27 1991-11-27 Driving circuit for display device

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KR960016342B1 KR960016342B1 (en) 1996-12-09

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EP0544427A2 (en) 1993-06-02
JPH05150737A (en) 1993-06-18
DE69216785D1 (en) 1997-02-27
KR960016342B1 (en) 1996-12-09
DE69216785T2 (en) 1997-07-24
EP0544427A3 (en) 1993-07-21
EP0544427B1 (en) 1997-01-15

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