EP0105767A1 - Verfahren zum Steuern einer Matrixanzeigeeinrichtung - Google Patents

Verfahren zum Steuern einer Matrixanzeigeeinrichtung Download PDF

Info

Publication number
EP0105767A1
EP0105767A1 EP83401688A EP83401688A EP0105767A1 EP 0105767 A1 EP0105767 A1 EP 0105767A1 EP 83401688 A EP83401688 A EP 83401688A EP 83401688 A EP83401688 A EP 83401688A EP 0105767 A1 EP0105767 A1 EP 0105767A1
Authority
EP
European Patent Office
Prior art keywords
columns
signal
electrodes
electrode
lines
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
EP83401688A
Other languages
English (en)
French (fr)
Other versions
EP0105767B1 (de
Inventor
Jean Frédéric Clerc
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.)
Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
Original Assignee
Commissariat a lEnergie Atomique CEA
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.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0105767A1 publication Critical patent/EP0105767A1/de
Application granted granted Critical
Publication of EP0105767B1 publication Critical patent/EP0105767B1/de
Expired legal-status Critical Current

Links

Images

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
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3644—Control of matrices with row and column drivers using a passive matrix with the matrix divided into sections

Definitions

  • the present invention relates to a method for controlling a matrix imager. It finds mainly an application in the production of liquid crystal display devices, used in particular in the binary display of complex images or of alpha-numeric characters.
  • These matrix display devices generally consist of a material formed of several zones distributed in a matrix and interspersed in a system with crossed bands or, in Anglo-Saxon terminology, in a "cross-bar" system.
  • Such systems include a first family of p parallel electrode lines and a second family of q parallel electrode columns, the electrode lines and columns being crossed, an area ij of the material being defined by the overlap region between line i, where i is an integer such as l ⁇ i ⁇ p and by column j, where j is an integer such as l ⁇ j ⁇ q.
  • These systems further comprise means making it possible to deliver on the rows and columns of electrodes appropriate excitation signals serving to excite an optical property of the material.
  • Numerous devices of this kind are known which use, for example as a sensitive material, a liquid crystal film, and in which the excitation is electric.
  • the invention applies particularly well to such devices, but it applies more generally to any device comprising a material of which an optical property can be modified by means of any excitation.
  • This excitation can be of an electrical nature, as for liquid crystals, but also magnetic, thermal, electronic, etc.
  • the material can be a solid or liquid body, amorphous or crystalline.
  • the optical property can be an opacity, a refractive index, a transparency, an absorption, a diffusion, a diffraction, a convergence, a rotary power, a birefringence, an intensity reflected in a determined solid angle etc ...
  • the most commonly used method of controlling a matrix imager for example with liquid crystals, consists in applying sequentially or successively to the electrode lines an electrical signal S o, for example sinusoidal, and in applying in parallel or simultaneously to the columns of electrodes and during the addressing of a line, sinusoidal electrical signals S j which can be either in phase opposition, or in phase with the signal S 0 depending on whether or not it is desired to display the liquid crystal zone corresponding.
  • an electrical signal S o for example sinusoidal
  • sinusoidal electrical signals S j which can be either in phase opposition, or in phase with the signal S 0 depending on whether or not it is desired to display the liquid crystal zone corresponding.
  • FIG. 1 shows an example of signals applied to the row electrodes and to the column electrodes of a matrix imager.
  • the first signal, bearing the reference a corresponds to the signal applied to line i;
  • the second signal, bearing the reference b corresponds to the signal applied to the column j and
  • the third signal, bearing the reference c corresponds to the signal, or voltage, seen by the area ij of the display material.
  • This easy-to-use control method can only be used for a limited number of lines (p close to 100), which limits its usefulness. reading. Indeed, in certain applications such as in pocket televisions, text display screens, ... the number of lines required is too large for this control method to be used; the use of this method results in insufficient contrast between the displayed points and the non-displayed points, leading to the production of a blurred image. This is linked to the reaction time of the display material, when it is excited, and / or to its memory effect.
  • electrode structures and control signals which make it possible to keep the number of display points, or display areas, desired on the imager and to halve the number rows of electrodes addressed sequentially.
  • the object of the present invention is precisely a method for controlling a matrix imager which makes it possible to remedy this drawback.
  • the subject of the invention is a method for controlling a matrix imager comprising a material of which an optical characteristic can be modified, this material being interposed between a first family of p rows of electrodes pa parallel lines and a second family of q columns of parallel electrodes, the lines and the columns being crossed, an area ij of the material being defined by the region of the material covered by the line i, where i is an integer such as 1 ip, and by column j, where j is an integer such as 1 jq, the rows and columns used to convey signals causing excitation of the material.
  • This method is characterized in that, the electrode columns having n horizontal discontinuities defining n + 1 identical sets of electrode columns, a signal I is applied to the line of electrode i and to the other lines of electrodes a zero signal, the signal I being applied sequentially to the p electrode lines according to the increasing values of i, and in that a signal J is applied to the electrode columns, this signal J being applied simultaneously to the columns d 'electrodes of the first set, during the time of application of the signal I on the first p / n rows of electrodes, the columns of electrodes of the other sets receiving a zero signal, then on the columns of electrodes of the second set, during the time of application of the signal I on the p / n subsequent electrode lines, the electrode columns of the first set and of the other sets receiving a zero signal, and so on until the electrode columns are excited from the n th game.
  • the signals I and J are rectangular signals with zero mean value.
  • these signals I and J can be either in phase or in phase opposition.
  • the material whose optical characteristic can be modified is a liquid crystal film, the excitation signals applied to the electrodes being electrical voltages.
  • FIG. 2 represents a display device with crossed bands. It has walls 20 and 22, generally transparent, arranged on either side of a shim 24 of thickness, made of insulating material, defining a volume 26 which is occupied, when the device is mounted, by the material of which controls an optical characteristic such as for example a liquid crystal film.
  • a shim 24 of thickness made of insulating material, defining a volume 26 which is occupied, when the device is mounted, by the material of which controls an optical characteristic such as for example a liquid crystal film.
  • On the walls 20 and 22 are deposited two systems of electrodes each constituted by a series of semi-transparent parallel conductive strips, noted i for the rows and j for the columns.
  • the useful surface of the liquid crystal is thus broken down into a mosaic of zones corresponding to the overlap zones of the two electrode systems, each zone corresponding to the overlap of two strips i and j, and which can therefore be identified by the ij notation.
  • the sensitization of a zone ij that is to say the control of an optical characteristic of the liquid crystal contained in this zone, is carried out by applying to the electrodes i and j electric voltages which cause the appearance d 'an electric field within the liquid crystal.
  • the column electrodes j have n horizontal discontinuities 28 defining n + 1 identical sets of q columns of electrodes, q being the total number of columns of electrodes.
  • n horizontal discontinuities 28 defining n + 1 identical sets of q columns of electrodes, q being the total number of columns of electrodes.
  • FIG. 2 only one discontinuity 28 has been shown defining two sets of electrode columns, an upper set bearing the reference d and a lower set bearing the reference e.
  • a signal I is applied to the electrode line i, using known means, and to the other electrode lines a zero signal.
  • This signal I is preferably a rectangular signal with zero mean value as shown in FIG. 3.
  • the excitation of all the lines i takes place sequentially and according to the increasing values of i. In other words, we apply the signal I on the first line, then on the second line, then on the third line, etc ... up to the p th line, p being the total number of lines. This is compatible with taking information on a video signal.
  • a signal J is applied to the electrode column j.
  • This signal can for example be a rectangular signal with zero mean value as shown in FIG. 3.
  • this signal J is applied simultaneously to the columns of electrodes of the first set during the addressing time, or time of application of the signal I, of the p / n first rows of electrodes, the columns of electrodes of other games receiving a zero signal.
  • This signal J is then applied simultaneously to the columns of electrodes of the second set during the addressing time, or application of the signal I, of the p / n rows of following electrodes, the columns of electrodes of all the other sets, including the first game to receive a null signal.
  • the appearance of an image on the entire device is obtained by exciting the electrode columns of all the games, as before, and one after the other until excitation of the electrode columns of the n th set.
  • the excitation of the n + 1 sets of electrode columns is done using known means associated with each set of columns d 'electrodes.
  • the signal J is applied simultaneously to the columns of the set d (FIG. 2), during the sequential addressing of the lines 1, 2, 3, 4 and 5 respectively, the columns of the game e receiving a zero signal; then the signal J is applied simultaneously to the columns of the set e, during the sequential addressing of the lines 6, 7, 8, 9 and 10 respectively, the columns of the set d receiving a zero signal.
  • the display of the zone ij is done when the signal I and the signal J are, during time t, in phase opposition and the non-display of this zone is done when the signals 1 and J are in phase, as shown in this figure.
  • this figure shows a third signal K corresponding to the signal, or voltage, seen by the area ij of the display material.
  • the three signals I, J, K all present a zero value after a time T / 2. This time corresponds to the addressing time of p / 2 electrode lines and one of the two sets of electrode columns.

Landscapes

  • 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 (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP83401688A 1982-08-26 1983-08-19 Verfahren zum Steuern einer Matrixanzeigeeinrichtung Expired EP0105767B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8214644A FR2532455A1 (fr) 1982-08-26 1982-08-26 Procede de commande d'un imageur matriciel
FR8214644 1982-08-26

Publications (2)

Publication Number Publication Date
EP0105767A1 true EP0105767A1 (de) 1984-04-18
EP0105767B1 EP0105767B1 (de) 1987-01-07

Family

ID=9277066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401688A Expired EP0105767B1 (de) 1982-08-26 1983-08-19 Verfahren zum Steuern einer Matrixanzeigeeinrichtung

Country Status (6)

Country Link
US (1) US4541690A (de)
EP (1) EP0105767B1 (de)
JP (1) JPS5958482A (de)
CA (1) CA1217586A (de)
DE (1) DE3369020D1 (de)
FR (1) FR2532455A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2542119A1 (fr) * 1982-12-28 1984-09-07 Citizen Watch Co Ltd Procede pour commander un ecran d'affichage matriciel a cristaux liquides
EP0315365A3 (de) * 1987-11-04 1991-03-20 THORN EMI plc Anzeigegerät

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59204887A (ja) * 1983-05-10 1984-11-20 セイコーエプソン株式会社 表示パネル駆動方法
JPS60220316A (ja) * 1984-04-16 1985-11-05 Canon Inc 液晶光学素子
FR2580106B1 (de) * 1985-04-05 1988-03-18 Commissariat Energie Atomique
FR2581783B1 (fr) * 1985-05-07 1989-05-12 Commissariat Energie Atomique Dispositif d'affichage a matrice active et a commande integree comprenant deux familles d'electrodes lignes et deux familles d'electrodes colonnes par point image et son procede de commande
US4944578A (en) * 1988-07-21 1990-07-31 Telex Communications Color graphic imager utilizing a liquid crystal display

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443699A1 (fr) * 1978-12-08 1980-07-04 Seiko Instr & Electronics Dispositif d'affichage a cristaux liquides
US4281324A (en) * 1977-10-31 1981-07-28 Sharp Kabushiki Kaisha Matrix type liquid crystal display

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5458399A (en) * 1977-10-18 1979-05-11 Sharp Corp Matrix type liquid crystal display unit
US4375317A (en) * 1978-11-16 1983-03-01 Sharp Kabushiki Kaisha Multi-layered liquid crystal display panel
US4443062A (en) * 1979-09-18 1984-04-17 Citizen Watch Company Limited Multi-layer display device with nonactive display element groups

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281324A (en) * 1977-10-31 1981-07-28 Sharp Kabushiki Kaisha Matrix type liquid crystal display
FR2443699A1 (fr) * 1978-12-08 1980-07-04 Seiko Instr & Electronics Dispositif d'affichage a cristaux liquides

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2542119A1 (fr) * 1982-12-28 1984-09-07 Citizen Watch Co Ltd Procede pour commander un ecran d'affichage matriciel a cristaux liquides
EP0315365A3 (de) * 1987-11-04 1991-03-20 THORN EMI plc Anzeigegerät

Also Published As

Publication number Publication date
US4541690A (en) 1985-09-17
FR2532455B1 (de) 1984-12-07
JPS5958482A (ja) 1984-04-04
FR2532455A1 (fr) 1984-03-02
DE3369020D1 (en) 1987-02-12
CA1217586A (en) 1987-02-03
JPH0150915B2 (de) 1989-11-01
EP0105767B1 (de) 1987-01-07

Similar Documents

Publication Publication Date Title
EP0051521B1 (de) Verfahren zum Steuern einer optischen Charakteristik eines Materials
EP0055966B1 (de) Matrixanzeigevorrichtung mit zwei Arten von Linienelektroden und Verfahren zu ihrer Ansteuerung
EP0162775B1 (de) Flüssigkristallzelle mit einer homeotropen Struktur und mit Doppelbrechungskompensation dieser Struktur
EP1040391B1 (de) Anzeigeeinheit mit zwei übereinander liegenden anzeigevorrichtungen
CH647337A5 (fr) Dispositif electro-optique a cristaux liquides chiraux smectiques c ou h.
FR2563018A1 (fr) Dispositif optique a cristal liquide
EP0058593B1 (de) Matrixanzeigevorrichtung mit verschiedenen Arten von Elektroden und Verfahren zu ihrer Ansteuerung
FR2623649A1 (fr) Cellule d'affichage a cristal liquide
EP0286539A1 (de) Bistabile smektische ferroelektrische Flüssigkristall-Anzeigevorrichtung
EP0093035B1 (de) Optische Flüssigkristallzellen
CH690941A5 (fr) Dispositif électronique pourvu d'un affichage pour présenter des données.
EP0123568B1 (de) Matrixanzeigeeinrichtung mit Kompensation der Kopplung zwischen Zeilen und Spalten
EP0105767B1 (de) Verfahren zum Steuern einer Matrixanzeigeeinrichtung
EP0120732B1 (de) Verfahren zur sequentiellen Steuerung einer Flüssigkristall-Matrixanzeigeeinrichtung unter Benutzung des cholesterisch-nematischen Phasenübergangs
EP0246945B1 (de) Elektro-optischer Anzeigeschirm und sein Herstellungsverfahren
EP2721598B1 (de) Flüssigkristallanzeige mit löschelektroden
EP0237539B1 (de) Anlage zur steuerung einer matrixanzeigetafel mit integriertem speicher und verfahren zu deren steuerung
WO2005096261A1 (fr) Dispositif de detection d'image figee sur un ecran a cristaux liquides
EP0209439B1 (de) Elektro-optische Anzeigevorrichtung mit Flüssigkristallen
EP0142385A1 (de) Verfahren und Einrichtung zur Abbildung von Symbolen auf eine Flüssigkristallmatrixanzeige
CH625630A5 (de)
EP0731374A1 (de) Flüssigkristallanzeige mit verbessertem Sichtwinkel
EP0268522A1 (de) Matrixanzeigeeinrichtung und Verfahren zur Steuerung derselben
EP0176384B1 (de) Vielfarbige Matrixanzeigevorrichtung ohne Kopplung zwischen Zeilen und Spalten
EP0106717B1 (de) Anzeigevorrichtung mit aktiver Steuerung mittels eines Fotoleiters

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT NL

17P Request for examination filed

Effective date: 19840908

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT NL

REF Corresponds to:

Ref document number: 3369020

Country of ref document: DE

Date of ref document: 19870212

ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980729

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980731

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19980831

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990819

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000301

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990819

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20000301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000601