EP0394903A2 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
EP0394903A2
EP0394903A2 EP90107631A EP90107631A EP0394903A2 EP 0394903 A2 EP0394903 A2 EP 0394903A2 EP 90107631 A EP90107631 A EP 90107631A EP 90107631 A EP90107631 A EP 90107631A EP 0394903 A2 EP0394903 A2 EP 0394903A2
Authority
EP
European Patent Office
Prior art keywords
pulse
scanning line
scanning
data
liquid crystal
Prior art date
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.)
Granted
Application number
EP90107631A
Other languages
German (de)
English (en)
Other versions
EP0394903B1 (fr
EP0394903A3 (fr
Inventor
Osamu C/O Canon Kabushiki Kaisha Taniguchi
Akira C/O Canon Kabushiki Kaisha Tsuboyama
Yutaka C/O Canon Kabushiki Kaisha Inaba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
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Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0394903A2 publication Critical patent/EP0394903A2/fr
Publication of EP0394903A3 publication Critical patent/EP0394903A3/fr
Application granted granted Critical
Publication of EP0394903B1 publication Critical patent/EP0394903B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G09G3/3674—Details of drivers for scan electrodes
    • 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
    • G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0205—Simultaneous scanning of several lines in flat panels
    • 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
    • G09G2310/04—Partial updating of the display screen
    • 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
    • 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
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

Definitions

  • the present invention relates to a liquid crystal apparatus including a ferroelectric liquid crystal device and a multiplexing drive means.
  • bistable liquid crystal device In recent years, the use of a bistable liquid crystal device has been proposed as an improvement to the conventional TN-liquid crystal device by Clark and Lagerwall (U.S. Patent No. 4,367,924, etc.).
  • a ferroelectric liquid crystal having a chiral smectic C phase (SmC*) or H phase (SmH*) is generally used.
  • the liquid crystal shows bistable states including a first and a second optically stable state in response to an electric field, so that the liquid crystal is oriented to, e.g., the first optically stable state in response to one electric field vector and to the second optically stable state in response to the other electric field vector.
  • the liquid crystal very quickly responds to an applied electric field to be oriented to either one of the two stable states and retains the resultant state in the absence of an electric field.
  • the above-mentioned U.S. Patent No. 4770502 has proposed a driving method wherein selection terms for scanning lines are overlapped to each other to provide an increased frequency. This method is accompanied with a tendency that the drive margin (2) is further decreased, so that it has been difficult to satisfy a high frame frequency and a wide drive margin in combination by the conventional methods.
  • An object of the present invention is to provide a ferroelectric liquid crystal apparatus which satisfies a higher frame frequency in multiplexing drive of a ferroelectric liquid crystal device while retaining a sufficient drive margin.
  • a liquid crystal apparatus comprising: a ferroelectric liquid crystal device comprising an electrode matrix including a plurality of scanning lines and a plurality of data lines intersecting with the scanning lines, and a ferroelectric liquid crystal disposed between the scanning lines and data lines, and drive means for sequentially applying a scanning signal to the scanning lines for selecting a particular scanning line, and for applying data signals for the pixels on the selected scanning line to the data lines, wherein each of the data signals has a plurality of pulses including a pulse in a controlled phase and a pulse in an auxiliary phase, and the scanning signal for the selected scanning line has a compensation pulse for compensating the pulse in the auxiliary phase of a data signal for a pixel on the selected scanning line.
  • Figure 1 shows a set of driving signal waveforms used in an embodiment of the liquid crystal apparatus according to the present invention, in which a selection signal waveform is shown at (a), and data signal waveforms corresponding to "white” and “black” image data are shown at (b) and (c), respectively. Further, a voltage of, e.g., zero (not shown) is applied to scanning lines at the time of non-selection.
  • a phase having a pulse duration t2 and a voltage value V5 is a control phase
  • phases having a pulse duration t3 and a voltage value -V4 are auxiliary phases.
  • the selection signal waveform at Figure 1(a) comprises a clear or erasing phase having a pulse duration t1 and a voltage value V1, a control phase having a pulse duration t2 and a voltage value -V2, and an auxiliary phase having a pulse duration t3 and a voltage value V3, which is a phase for compensating an auxiliary phase of the data signal.
  • the voltage V3 is set to satisfy 0 ⁇ V3 ⁇ V1 and may preferably satisfy
  • the provision of this compensation phase is a characteristic of the present invention, by which the above-mentioned drive margin is remarkably improved.
  • all the pixels on a selected scanning line are once simultaneously cleared into a black state.
  • Figures 2A and 2B respectively show a time-­serial waveform for providing a display as shown in Figure 3 based on unit drive signals shown in Figure 1.
  • FIGS. 2A and 2B at S1 - S4 are shown scanning signal waveforms applied to scanning lines s1 - s4 in Figure 3, at I1 and I2 are shown data signal waveforms applied to data lines i1 and i2, and at (I1 - S3) and (I2 - S2) are shown a combined waveform of the data signal waveform I1 and scanning signal waveform S3 and a combined waveform of the data signal waveform I2 and scanning signal waveform S2, respectively.
  • the sequence shown in Figure 2A is preferred so that a lower frame frequency can be set.
  • a specific embodiment driven at a duty factor of 1/400 at room temperature provided an increased frame frequency of 1.3 times and an increased drive margin by about 10 % compared with a conventional drive embodiment shown in Figure 4. Further, compared with a conventional drive embodiment shown in Figure 5, an increased drive margin by about 50 % was attained.
  • Figures 4 and 5 respectively show time-serial waveforms used in a driving embodiment outside the present invention, in which at S1 - S4 are shown scanning signals applied to scanning lines s1 - s4, at I1 and I2 are shown data signals applied to data lines i1 and i2, and at (I1 - S3) and (I2 - S2) are shown combinations of I1 and S3 and I2 and S2, respectively, for providing a display pattern as shown in Figure 3.
  • the drive waveforms are used in a type of driving method wherein all the pixels on a selected scanning line are once written in "black” and then retained in "black” or written in "white” selectively depending on given data.
  • the drive waveforms are designed so as to alleviate "flickering" at the time of matrix drive, but the waveforms shown in Figure 4 are accompanied with a low frame frequency, and the waveforms shown in Figure 5 are accompanied with a small drive margin.
  • Figure 6 is a block diagram showing an arrangement of a ferroelectric liquid crystal display apparatus 601 and a graphic controller 602 provided in an apparatus body of, e.g., a personal computer as a source of supplying display data.
  • Figure 7 is a time chart for communication of image data.
  • a display panel 603 comprises a matrix electrode structure composed of 1120 scanning electrodes and 1280 data electrodes respectively disposed on a pair of glass plates and subjected to an aligning treatment, and a ferroelectric liquid crystal disposed between the glass substrates.
  • the scanning electrodes (lines) and data electrodes (lines) are connected to a scanning line drive circuit 604 and a data line drive circuit 605, respectively.
  • the graphic controller 602 supplies scanning line address data for designating a scanning line and image data (PD0 - PD3) on the scanning line designated by the address data to a display drive circuit 604/605 (composed of a scanning line drive circuit 604 and a data line drive circuit 605) of the liquid crystal display apparatus 601.
  • the image data comprising the scanning line address data and the display data are transferred through the same transmission line, so that it is necessary to differentiate the above-mentioned two types of data.
  • a signal AH/DL is used for the differentiation.
  • the AH/DL signal at a high level means scanning line address data
  • the AH/DL signal at a low level means display data.
  • the scanning line address data are extracted from transferred image data PD0 - PD3 by a drive control circuit 611 and then supplied to the scanning line drive circuit 604 in synchronism with a time for driving a designated scanning line.
  • the scanning line address data are inputted to a decoder 606 in the scanning line drive circuit 604, and a designated scanning line in the display panel 603 is driven by a scanning signal generating circuit 607 with the aid of the decoder 606.
  • the display data are introduced to a shift register 608 in the data line drive circuit 605 and shifted by a unit of 4 pixel data based on a transfer clock signal.
  • the shift register 608 When the shift of display data for one horizontal scanning line is completed by the shift register 608, the display data for 1280 pixels are transferred to a line memory disposed in parallel, memorized for a period of one horizontal scanning and are supplied to the respective data lines as display data signals through a data signal generating circuit 610.
  • the drive of the display panel 603 in the liquid crystal display apparatus 601 is not synchronized with the generation of the scanning line address data and display data in the graphic controller 602, so that it is necessary to synchronize the apparatus 601 and 602 at the time of image data transfer.
  • a signal SYNC is in charge of the synchronization and is generated in the drive control circuit 611 in the liquid crystal display apparatus 601 at each one horizontal scanning period.
  • the graphic controller 602 always monitors the SYNC signal, and transfers image data when the SYNC signal is at a low level and does not effect transfer after completing transfer of image data for one horizontal scanning line when the SYNC signal is at high level.
  • the graphic controller 602 immediately sets the AH/DL signal at high level and starts transfer of image data for one horizontal scanning line when it detects that the SYNC signal is at low level.
  • the drive control circuit 611 in the liquid crystal display apparatus 601 set to the SYNC signal at high level during the image data transfer period.
  • the drive controller circuit (FLCD controller) 611 returns the SYNC signal to the low level so that it can receive image data for a subsequent scanning line.
  • a ferroelectric liquid crystal As an example of a ferroelectric liquid crystal, a mixture of ester compounds and pyrimidine compounds showing the following phase transition series may be used in the present invention.
  • the data signal used has an auxiliary phase which alleviates flicker, etc., of an image but can increase the tendency of an unexpected inversion of a display state thereby, while the scanning signal has a pulse phase for compensating an ill effect of the pulse in the auxiliary phase of the data signal, whereby the drive margin is remarkably improved to provide a room for increasing the frame frequency so that both the drive margin and the frame frequency are increased.
  • a liquid crystal apparatus includes: a ferroelectric liquid crystal device comprising an electrode matrix including a plurality of scanning lines and a plurality of data lines intersecting with the scanning lines, and a ferroelectric liquid crystal disposed between the scanning lines and data lines, and drive means for sequentially applying a scanning signal to the scanning lines for selecting a particular scanning line, and for applying data signals for the pixels on the selected scanning line to the data lines; wherein each of the data signals has a plurality of pulses including a pulse in a controlled phase and a pulse in an auxiliary phase, and the scanning signal for the selected scanning line has a compensation pulse for compensating the pulse in the auxiliary phase of a data signal for a pixel on the selected scanning line.

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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)
  • Liquid Crystal Substances (AREA)
EP90107631A 1989-04-24 1990-04-23 Dispositif d'affichage à cristaux liquides Expired - Lifetime EP0394903B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1101733A JP2652886B2 (ja) 1989-04-24 1989-04-24 液晶装置の駆動方法
JP101733/89 1989-04-24

Publications (3)

Publication Number Publication Date
EP0394903A2 true EP0394903A2 (fr) 1990-10-31
EP0394903A3 EP0394903A3 (fr) 1991-09-18
EP0394903B1 EP0394903B1 (fr) 1995-07-19

Family

ID=14308464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107631A Expired - Lifetime EP0394903B1 (fr) 1989-04-24 1990-04-23 Dispositif d'affichage à cristaux liquides

Country Status (5)

Country Link
EP (1) EP0394903B1 (fr)
JP (1) JP2652886B2 (fr)
AT (1) ATE125380T1 (fr)
DE (1) DE69020942T2 (fr)
ES (1) ES2074493T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007235A1 (fr) * 1992-09-23 1994-03-31 Central Research Laboratories Limited Adressage de l'echelle de gris des afficheurs a cristaux liquides ferroelectriques
US5321419A (en) * 1991-06-18 1994-06-14 Canon Kabushiki Kaisha Display apparatus having both refresh-scan and partial-scan
US5657041A (en) * 1994-06-03 1997-08-12 Samsung Display Devices Co., Ltd. Method for driving a matrix liquid crystal display panel with reduced cross-talk and improved brightness ratio
US6271817B1 (en) 1991-03-20 2001-08-07 Seiko Epson Corporation Method of driving liquid crystal display device that reduces afterimages
US6300925B1 (en) * 1997-10-20 2001-10-09 U.S. Philips Corporation Display device
DE102011007493A1 (de) * 2011-04-15 2012-10-18 Aeg Gesellschaft für Moderne Informationssysteme mbH Flüssigkristallanzeige und Verfahren zu deren Ansteuerung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701241B1 (fr) * 1994-09-12 2001-11-21 Canon Kabushiki Kaisha Méthode d'entraínement pour dispositif à cristaux liquides ferroélectriques
JP3286503B2 (ja) * 1994-09-28 2002-05-27 キヤノン株式会社 液晶素子の駆動法、及び該駆動法が用いられる液晶装置
US6018330A (en) * 1995-04-28 2000-01-25 Canon Kabushiki Kaisha Liquid crystal display apparatus
US6061044A (en) * 1995-05-30 2000-05-09 Canon Kabushiki Kaisha Liquid-crystal display apparatus
US5734365A (en) * 1996-01-25 1998-03-31 Canon Kabushiki Kaisha Liquid crystal display apparatus
US5903251A (en) * 1996-01-29 1999-05-11 Canon Kabushiki Kaisha Liquid crystal apparatus that changes a voltage level of a correction pulse based on a detected temperature

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2569294A1 (fr) * 1984-08-18 1986-02-21 Canon Kk Panneau d'affichage et son procede de commande
US4765720A (en) * 1986-07-22 1988-08-23 Canon Kabushiki Kaisha Method and apparatus for driving ferroelectric liquid crystal, optical modulation device to achieve gradation
EP0306822A2 (fr) * 1987-08-31 1989-03-15 Sharp Kabushiki Kaisha Dispositif d'affichage pour cristaux liquides ferroélectriques

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2531683B2 (ja) * 1987-06-08 1996-09-04 キヤノン株式会社 液晶装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2569294A1 (fr) * 1984-08-18 1986-02-21 Canon Kk Panneau d'affichage et son procede de commande
US4765720A (en) * 1986-07-22 1988-08-23 Canon Kabushiki Kaisha Method and apparatus for driving ferroelectric liquid crystal, optical modulation device to achieve gradation
EP0306822A2 (fr) * 1987-08-31 1989-03-15 Sharp Kabushiki Kaisha Dispositif d'affichage pour cristaux liquides ferroélectriques

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6271817B1 (en) 1991-03-20 2001-08-07 Seiko Epson Corporation Method of driving liquid crystal display device that reduces afterimages
US5321419A (en) * 1991-06-18 1994-06-14 Canon Kabushiki Kaisha Display apparatus having both refresh-scan and partial-scan
WO1994007235A1 (fr) * 1992-09-23 1994-03-31 Central Research Laboratories Limited Adressage de l'echelle de gris des afficheurs a cristaux liquides ferroelectriques
US5657041A (en) * 1994-06-03 1997-08-12 Samsung Display Devices Co., Ltd. Method for driving a matrix liquid crystal display panel with reduced cross-talk and improved brightness ratio
US6300925B1 (en) * 1997-10-20 2001-10-09 U.S. Philips Corporation Display device
DE102011007493A1 (de) * 2011-04-15 2012-10-18 Aeg Gesellschaft für Moderne Informationssysteme mbH Flüssigkristallanzeige und Verfahren zu deren Ansteuerung
DE102011007493B4 (de) * 2011-04-15 2015-07-02 BMG Gesellschaft für moderne Informationssysteme mbH Flüssigkristallanzeige und Verfahren zu deren Ansteuerung

Also Published As

Publication number Publication date
EP0394903B1 (fr) 1995-07-19
ATE125380T1 (de) 1995-08-15
JP2652886B2 (ja) 1997-09-10
DE69020942D1 (de) 1995-08-24
JPH02281233A (ja) 1990-11-16
EP0394903A3 (fr) 1991-09-18
ES2074493T3 (es) 1995-09-16
DE69020942T2 (de) 1995-11-23

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