EP0464807A2 - Schaltungsanordnung zur Erzeugung von Anzeige-Treibersignalen - Google Patents

Schaltungsanordnung zur Erzeugung von Anzeige-Treibersignalen Download PDF

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Publication number
EP0464807A2
EP0464807A2 EP91111067A EP91111067A EP0464807A2 EP 0464807 A2 EP0464807 A2 EP 0464807A2 EP 91111067 A EP91111067 A EP 91111067A EP 91111067 A EP91111067 A EP 91111067A EP 0464807 A2 EP0464807 A2 EP 0464807A2
Authority
EP
European Patent Office
Prior art keywords
signal
elements
circuit generating
display
fact
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
EP91111067A
Other languages
English (en)
French (fr)
Other versions
EP0464807B1 (de
EP0464807A3 (en
Inventor
Fabio Zuliani
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.)
SELECO SpA
Original Assignee
SELECO SpA
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 SELECO SpA filed Critical SELECO SpA
Publication of EP0464807A2 publication Critical patent/EP0464807A2/de
Publication of EP0464807A3 publication Critical patent/EP0464807A3/en
Application granted granted Critical
Publication of EP0464807B1 publication Critical patent/EP0464807B1/de
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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3651—Control of matrices with row and column drivers using an active matrix using multistable liquid crystals, 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
    • 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
    • G09G2310/06—Details of flat display driving waveforms

Definitions

  • the present invention relates to a circuit generating signal for a matrix display of elements, in particular a display employing elements of a ferroelectric type.
  • ferroelectric crystals present interesting characteristics, such as high resolution and memory (infact these elements are of a flip-flop type).
  • ferroelectric crystals represent a particular state of liquid crystal, obtained through a particular manufacture
  • the characteristics of the relative driving signals must be strongly correlated to the actual structure of the crystals
  • the form of the signals must be of a complex type and in addition the actual characteristics vary generally with a change in temperature.
  • the aim of the present invention is therefore that of indicating a circuit generating driving signals for a matrix display of elements, particularly of a ferroelectric crystal type, that is both simple and flexible, and therefore easy to modify.
  • a further aim of the invention is to indicate a circuit generating signal for a display that easily permits to be compensated in temperature.
  • the present invention has as its object a circuit generating driving signals for a matrix display of elements, particularly a display of ferroelectric elements, characterised by the fact that the generator comprises a digital memory for a multiplicity of signals apt of creatinging a driving signal of a predetermined form and a selection device of said signals.
  • Figure 1 represents an example of driving signals obtainable with the signal generator according to the invention:
  • Such signal has as its base a fundamental sinusoid, to which waves of a higher frequency and lower amplitude are superimposed.
  • said driving signal presents a range of 2x48 volt and a period of 38 microseconds, and a fundamental frequency of 100Khz; as can be observed the slope varies; the interval of maximum slope lasts 5 microseconds.
  • the form of the signal represented in figure 1 is of a typical type, adapt for the driving of the various lines of the display; although the type of form and the optimum frequency may vary, as has already been said; for this reason an easily flexible and adaptable generator for eventual variations is needed.
  • FIG. 2 schematically represents a signal generator according to the invention.
  • the reference letter C represents a meter; this supplies the memory R (preferably of the type ROM or EPROM) with the increasing addresses (for example from 0 to N-1); the meter C is naturally driven by a clock generator CK.
  • the memory R supplies the signals apt to re-establish the desired form of driving wave to a digital/analogic convertor D at its output, that in turn drives an amplifyer A1, at the output of which the driving OUT signal for the display is available.
  • Figure 3 schematically represents the interlocking circuit.
  • the reference letter F indicates a temperature sensor placed in the display; it controls, through an amplyfyer A2, an oscillator 0, of the voltage control type (V.C.O.), whose frequence varies with the variation of the temperature, for example if the temperature increases, the frequency of the oscillator also increases and vice versa.
  • the signal generated by the oscillator 0, amplified by the amplifyer A3 supplies the clock signal for the generator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Liquid Crystal (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Selective Calling Equipment (AREA)
  • Electric Clocks (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
EP91111067A 1990-07-06 1991-07-04 Schaltungsanordnung zur Erzeugung von Anzeige-Treibersignalen Expired - Lifetime EP0464807B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67501A IT1240381B (it) 1990-07-06 1990-07-06 Circuito generatore di segnali di pilotaggio per display
IT6750190 1990-07-06

Publications (3)

Publication Number Publication Date
EP0464807A2 true EP0464807A2 (de) 1992-01-08
EP0464807A3 EP0464807A3 (en) 1992-07-01
EP0464807B1 EP0464807B1 (de) 1995-10-18

Family

ID=11302951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111067A Expired - Lifetime EP0464807B1 (de) 1990-07-06 1991-07-04 Schaltungsanordnung zur Erzeugung von Anzeige-Treibersignalen

Country Status (4)

Country Link
EP (1) EP0464807B1 (de)
DE (1) DE69113879T2 (de)
ES (1) ES2081394T3 (de)
IT (1) IT1240381B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809231A3 (de) * 1996-05-17 1997-12-03 Sharp Kabushiki Kaisha Ansteuermethode und Ansteuerschaltung für ferroelektrische Flüssigkristallvorrichtung
EP0809232A3 (de) * 1996-05-17 1997-12-03 Sharp Kabushiki Kaisha Ansteuermethode und Ansteuerschaltung für Flüssigkristallvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414544A (en) * 1981-06-12 1983-11-08 Interstate Electronics Corp. Constant data rate brightness control for an AC plasma panel
US4622549A (en) * 1983-06-29 1986-11-11 International Business Machines Corporation Repetition rate compensation and mixing in a plasma panel
US4819186A (en) * 1987-01-30 1989-04-04 Casio Computer Co., Ltd. Waveform generating apparatus for driving liquid crystal device
GB2207272B (en) * 1987-07-18 1991-08-14 Stc Plc Addressing liquid crystal cells

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0809231A3 (de) * 1996-05-17 1997-12-03 Sharp Kabushiki Kaisha Ansteuermethode und Ansteuerschaltung für ferroelektrische Flüssigkristallvorrichtung
EP0809232A3 (de) * 1996-05-17 1997-12-03 Sharp Kabushiki Kaisha Ansteuermethode und Ansteuerschaltung für Flüssigkristallvorrichtung
US6057821A (en) * 1996-05-17 2000-05-02 Sharp Kabushiki Kaisha Liquid crystal device
US6215533B1 (en) 1996-05-17 2001-04-10 Sharp Kabushiki Kaisha Ferroelectric liquid crystal driving using square wave and non-square wave signals

Also Published As

Publication number Publication date
EP0464807B1 (de) 1995-10-18
EP0464807A3 (en) 1992-07-01
IT1240381B (it) 1993-12-10
ES2081394T3 (es) 1996-03-01
IT9067501A1 (it) 1992-01-06
IT9067501A0 (it) 1990-07-06
DE69113879T2 (de) 1996-04-11
DE69113879D1 (de) 1995-11-23

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