[go: up one dir, main page]

WO1986006861A1 - Procede et agencement de commande d'affichages a cristaux liquides - Google Patents

Procede et agencement de commande d'affichages a cristaux liquides Download PDF

Info

Publication number
WO1986006861A1
WO1986006861A1 PCT/SE1986/000225 SE8600225W WO8606861A1 WO 1986006861 A1 WO1986006861 A1 WO 1986006861A1 SE 8600225 W SE8600225 W SE 8600225W WO 8606861 A1 WO8606861 A1 WO 8606861A1
Authority
WO
WIPO (PCT)
Prior art keywords
segments
display
large number
lcd
voltage
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.)
Ceased
Application number
PCT/SE1986/000225
Other languages
English (en)
Inventor
Glenn Bergwall
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.)
MICRO-E AB
Original Assignee
MICRO-E AB
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 MICRO-E AB filed Critical MICRO-E AB
Publication of WO1986006861A1 publication Critical patent/WO1986006861A1/fr
Priority to DK014387A priority Critical patent/DK14387A/da
Priority to NO870131A priority patent/NO870131L/no
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells

Definitions

  • the present invention relates to a method for driving LCD displays which comprises a large number of display segments capable of being connected electrically to a number of so-called rear faces, and which is so arranged as to have a voltage applied between the pairs of segments and the rear faces concerned in order to produce the desired colour tone and/or grey scale on the display.
  • Each individual LCD requires a certain amplitude in the drive voltage in order to be activated. As the voltage is reduced from the nominal maximum level the densit inside the segment will reduce, which is manifested as a lightening of the segment. It is possible in this way to produce the desired colour tone or grey scale on the display by varying the voltage which is applied between the rear face and the segment. Problems arise where a number of segments are present, since the normal procedure involves switching the polarity between the rear face and the segment in order to create the necessary alternating voltage. It has even been found necessary to utilize one rear face per segment in order to obtain said desired function, which has had the effect of making the design complicated and more expensive.
  • the principal object of the present invention is thus to make available a method which, amongst other things, will solve said problems. Said object is achieved by the application of a method in accordance with the present invention, which is characterized essentially in that a rear face common to a large number of segments is connected to a reference level and the segments are driven individually at variable alternating voltages, the crossovers of which lie essentially on the reference level.
  • a further object of the invention is to produce an arrangement whose application is made possible by the implementation of said method. Said further object is achieved by means of an arrangement in accordance with the present invention, which is characterized essentially in that a large number of display segments of the LCD type are capable of being connected, each via its own connection, to a source of alternating voltage and to a common rear face intended for said large number of display segments, and in that means are provided for the individual variation of the alternating voltage for the optionally paired
  • Fig. 1 shows a schematic perspective view of a display in accordance with the invention
  • Fig. 2 shows voltage curves for previously disclosed displays
  • Fig. 3 shows voltage curves in accordance with the invention.
  • the LCD display 1 illustrated schematically in Fig. 1 comprises a large number of display segments 2, 3 which exhibit in a previously disclosed fashion electrical connections 4,5 so arranged as to be capable of being connected to an appropriate so—called rear face 6 so as to permit a voltage to be applied between the pairs of segments and the rear faces 2, 6; 3, 6 in question via an electrical connection 7 leading to the rear face 6.
  • a common rear face 6 for a large number of segments 2, 3 is arranged in pairs and in such a way as to permit the rear face 6 and the segments 2, 3 to be supplied with power and driven individually with a variable alternating voltage, as shown in Fig. 3, in order to produce the desired colour tone and/or grey scale on the LCD display segment 2, 3 in question.
  • the common rear face 6 for a large number of segments 2, 3 is connected in accordance with the invention to a constant voltage, for example 5 volts, relating to the reference level U6, thus enabling the reference level to be specified without restriction within a wide range of values.
  • the crossovers for the respective alternating voltages, whose oscillations may exhibit curved form or the so—called square wave form, for example, are so arranged as to lie essentially on said reference level U6, unlike the previously disclosed technique, as illustrated in Fig.
  • the alternating voltage B for the rear face 6 is caused to oscillate from a neutral level, for example 0 volt, to the desired voltage level
  • the voltage for the respective segments S1 and S2 is caused to oscillate between the desired values, for example between 1 and 4 volts or between 2 and 3 volts, in order to produce a potential difference between the respective rear face and segments and in order to bring about a change in the tone on the display involving, amongst other things, the decomposition of the LCD liquid as a negative result.
  • the liquid in each LCD display is caused to permit light to pass to a varying degree with the possibility of producing any desired tone and/or grey scale on the respective display segments 2, 3.
  • Means are afforded by the proposed arrangement in accordance with the invention for the individual variation of the alternating voltage for the optionally paired display segments 2, 3 and the rear face 6, which can be executed in the form of previously disclosed components of this kind, in order to permit a certain amplitude to be achieved on the drive voltage so that each individual LCD segment can be activated at the desired time.
  • the voltage is thus reduced from the proposed selected reference level, a reduction will occur in the density of the segment 2, 3 in question, causing it to become lighter.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

Procédé de commande d'affichages à cristaux liquides comprenant un grand nombre de segments d'affichage (2, 3) pouvant être connectés électriquement à un certain nombre d'éléments appelés faces arrière (6), une tension étant appliquée entre les paires de segments et les faces arrière relatives afin de produire la tonalité chromatique et/ou l'échelle de gris désirées dans l'affichage. Il est ainsi possible, grâce à un agencement simple, d'obtenir la tonalité chromatique et l'échelle de gris désirées dans l'affichage à cristaux liquides en question. Une face arrière (6) commune à un certain nombre de segments de cristaux liquides (2, 3) est connectée à un niveau de référence, et les segments (2, 3) sont alimentés individuellement à des tensions alternatives variables, dont les points de croisement sont situés essentiellement au niveau de référence. L'invention se rapporte également à un agencement permettant d'appliquer ce procédé.
PCT/SE1986/000225 1985-05-14 1986-05-14 Procede et agencement de commande d'affichages a cristaux liquides Ceased WO1986006861A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK014387A DK14387A (da) 1985-05-14 1987-01-13 Fremgangsmaade og apparat til drift af lcd-displays
NO870131A NO870131L (no) 1985-05-14 1987-01-13 Fremgangsmaate og anordning av en lcd-displayer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8502408A SE447519B (sv) 1985-05-14 1985-05-14 Forfarande samt anordning for att driva lcd-displayer
SE8502408-1 1985-05-14

Publications (1)

Publication Number Publication Date
WO1986006861A1 true WO1986006861A1 (fr) 1986-11-20

Family

ID=20360227

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000225 Ceased WO1986006861A1 (fr) 1985-05-14 1986-05-14 Procede et agencement de commande d'affichages a cristaux liquides

Country Status (6)

Country Link
EP (1) EP0259335A1 (fr)
JP (1) JPS62502856A (fr)
AU (1) AU5905186A (fr)
DK (1) DK14387A (fr)
SE (1) SE447519B (fr)
WO (1) WO1986006861A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9707345B2 (en) 2011-11-23 2017-07-18 Sanofi-Aventis Deutschland Gmbh Method and medical device for adjusting dose of fluid medicament

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281902A (en) * 1977-07-29 1981-08-04 Bbc Brown, Boveri & Company Limited Electro-optical device for the display of dark symbols composed of separately selectable display segments against a bright background and a means for addressing this device
DE3300264A1 (de) * 1983-01-07 1984-07-12 Robert Bosch Gmbh, 7000 Stuttgart Anzeigevorrichtung mit durchkontaktierten elektroden

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281902A (en) * 1977-07-29 1981-08-04 Bbc Brown, Boveri & Company Limited Electro-optical device for the display of dark symbols composed of separately selectable display segments against a bright background and a means for addressing this device
DE3300264A1 (de) * 1983-01-07 1984-07-12 Robert Bosch Gmbh, 7000 Stuttgart Anzeigevorrichtung mit durchkontaktierten elektroden

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9707345B2 (en) 2011-11-23 2017-07-18 Sanofi-Aventis Deutschland Gmbh Method and medical device for adjusting dose of fluid medicament

Also Published As

Publication number Publication date
DK14387D0 (da) 1987-01-13
JPS62502856A (ja) 1987-11-12
EP0259335A1 (fr) 1988-03-16
AU5905186A (en) 1986-12-04
SE447519B (sv) 1986-11-17
DK14387A (da) 1987-01-13
SE8502408D0 (sv) 1985-05-14

Similar Documents

Publication Publication Date Title
US4769639A (en) Liquid crystal drive circuit for driving a liquid crystal display element having scanning and signal electrodes arranged in matrix form
US6587088B2 (en) Multiple-tone display system
CA1126424A (fr) Afficheur a cristaux liquides pour facteurs de multiplexage temporel eleves
EP0361981A2 (fr) Dispositif d'affichage à cristal liquide pour affichage avec niveaux de gris
EP0841587A3 (fr) Modulateur optique du type Mach-Zehnder à modulation de fréquence parasite (chirp) contrÔlable
GB2126402A (en) Liquid crystal display
ATE157793T1 (de) Verfahren und vorrichtung zur ansteuerung einer flüssigkristall-anzeigeeinrichtung
KR100268594B1 (en) Method of driving display element and its driving device
US3911421A (en) Selection system for matrix displays requiring AC drive waveforms
EP0867744A3 (fr) Modulateur acousto-optique multicannal
US3863221A (en) Method of driving liquid cell display panel
US6643051B1 (en) Method and system for generating return-to-zero signals
WO1986006861A1 (fr) Procede et agencement de commande d'affichages a cristaux liquides
EP0071301A1 (fr) Circuit d'attaque
US5200741A (en) Liquid-crystal display apparatus
DE68907663T2 (de) Verfahren und Vorrichtung zur Hinterbeleuchtung einer Matrix-Flüssigkristallanzeige.
US4896945A (en) Liquid crystal cell array and method for driving the same
JPH10213789A (ja) 液晶表示装置
JP2641766B2 (ja) 液晶ディスプレイ装置
NO870131L (no) Fremgangsmaate og anordning av en lcd-displayer.
EP1351213A1 (fr) Système et méthode de commande d'un dispositif d'affichage à cristaux liquides et dispositif d'affichage à cristaux liquides
SU1290500A1 (ru) Устройство формировани бипол рных импульсов (его варианты)
GB2194375A (en) Liquid crystal display driving arrangement
JPS6416087A (en) Liquid crystal matrix panel drive circuit
US7245418B2 (en) Electro-optic switching apparatus not requiring DC bias

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU DK FI JP NO US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LU NL SE