FR2309000A1 - Control circuit for liquid crystal display - prevents polarisation phenomena due to DC component of excitation current - Google Patents

Control circuit for liquid crystal display - prevents polarisation phenomena due to DC component of excitation current

Info

Publication number
FR2309000A1
FR2309000A1 FR7513051A FR7513051A FR2309000A1 FR 2309000 A1 FR2309000 A1 FR 2309000A1 FR 7513051 A FR7513051 A FR 7513051A FR 7513051 A FR7513051 A FR 7513051A FR 2309000 A1 FR2309000 A1 FR 2309000A1
Authority
FR
France
Prior art keywords
liquid crystal
crystal display
control circuit
component
excitation current
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
FR7513051A
Other languages
French (fr)
Other versions
FR2309000B1 (en
Inventor
Jacques Valin
Guy Menard
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.)
INFORMATIQUE CIE INTERNATIONALE
Original Assignee
INFORMATIQUE CIE INTERNATIONALE
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 INFORMATIQUE CIE INTERNATIONALE filed Critical INFORMATIQUE CIE INTERNATIONALE
Priority to FR7513051A priority Critical patent/FR2309000A1/en
Publication of FR2309000A1 publication Critical patent/FR2309000A1/en
Application granted granted Critical
Publication of FR2309000B1 publication Critical patent/FR2309000B1/fr
Granted 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
    • G09G3/3611—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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions 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
    • G09G3/34—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
    • G09G3/3681—Details of drivers for scan electrodes suitable for passive matrices only

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)

Abstract

The control circuit for the liquid crystal display is characterised by the fact that the excitation voltage is provided by a square wave generator followed by a frequency divider. The excitation signal furnished by the frequency divider is permanently applied to one of the electrodes (2) of the display element. The second electrode (3) receives either the excitation signal or a signal in phase opposition to that of the excitation voltage. In one of the supply lines to one of the electrodes a capacitor is connected in series with this line. The second electrode (3) is connected to the output of an EXCLUSIVE OR logic (4, 5) circuit one of whose inputs receive the excitation voltage the other a logic control signal.
FR7513051A 1975-04-25 1975-04-25 Control circuit for liquid crystal display - prevents polarisation phenomena due to DC component of excitation current Granted FR2309000A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7513051A FR2309000A1 (en) 1975-04-25 1975-04-25 Control circuit for liquid crystal display - prevents polarisation phenomena due to DC component of excitation current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7513051A FR2309000A1 (en) 1975-04-25 1975-04-25 Control circuit for liquid crystal display - prevents polarisation phenomena due to DC component of excitation current

Publications (2)

Publication Number Publication Date
FR2309000A1 true FR2309000A1 (en) 1976-11-19
FR2309000B1 FR2309000B1 (en) 1977-11-10

Family

ID=9154509

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7513051A Granted FR2309000A1 (en) 1975-04-25 1975-04-25 Control circuit for liquid crystal display - prevents polarisation phenomena due to DC component of excitation current

Country Status (1)

Country Link
FR (1) FR2309000A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128761A1 (en) * 1971-03-12 1972-10-20 Hamilton Watch Co
FR2161650A5 (en) * 1971-11-16 1973-07-06 Optel Corp
US3781865A (en) * 1969-06-21 1973-12-25 Suwa Seikosha Kk Display device for electronic desk calculator
US3845615A (en) * 1973-07-05 1974-11-05 Uranus Electronics Multiplexed liquid crystal display
FR2234625A1 (en) * 1973-06-22 1975-01-17 Matsushita Electric Ind Co Ltd

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781865A (en) * 1969-06-21 1973-12-25 Suwa Seikosha Kk Display device for electronic desk calculator
FR2128761A1 (en) * 1971-03-12 1972-10-20 Hamilton Watch Co
FR2161650A5 (en) * 1971-11-16 1973-07-06 Optel Corp
FR2234625A1 (en) * 1973-06-22 1975-01-17 Matsushita Electric Ind Co Ltd
US3845615A (en) * 1973-07-05 1974-11-05 Uranus Electronics Multiplexed liquid crystal display

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
*REVUE US "ELECTRONIC DESIGN"VOLUME 18, NO. 23, 8 NOVEMBRE 1970, PAGE 86, ARTICLE DE J.E. BLECKSMITH" A SIMPLE ASTABLE MULTIVIBRATOR USES ONLY TWO INVERTERS" *
*REVUE US "MACHINE DESIGN" VOLUME 46, NO. 27, 14 NOVEMBRE 1970, PAGES 166-170 *
ARTICLE ANONYME "CIRCUITI DI COMMANDO PER INDICATORI A CRISTALLO LIQUIDO") *
ARTICLE DE P.G. BARTLETT "SUPERPRECISE TIMEKEEPING") *
MOS DIGITAL WRISTWATCH FEATURES LIQUID CRYSTAL DISPLAY" *
REVUE IT "ALTA FREQUENZA", VOLUME 42, NO. 3, MARS 1973, PAGES 51N-52N *
REVUE US "ELECTRONICS", VOLUME 45, NO. 8, 10 AVRIL 1972, PAGES 93-97, ARTICLE DE N.A. LUCE "C *

Also Published As

Publication number Publication date
FR2309000B1 (en) 1977-11-10

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Legal Events

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CD Change of name or company name
TP Transmission of property
ST Notification of lapse