EP0101702B1 - Method and wiring system for driving a picture display, particularly an ac electroluminescent display - Google Patents

Method and wiring system for driving a picture display, particularly an ac electroluminescent display Download PDF

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Publication number
EP0101702B1
EP0101702B1 EP19830900715 EP83900715A EP0101702B1 EP 0101702 B1 EP0101702 B1 EP 0101702B1 EP 19830900715 EP19830900715 EP 19830900715 EP 83900715 A EP83900715 A EP 83900715A EP 0101702 B1 EP0101702 B1 EP 0101702B1
Authority
EP
European Patent Office
Prior art keywords
voltage
line selection
column
column modulation
voltages
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.)
Expired
Application number
EP19830900715
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0101702A1 (en
Inventor
Terho Teuvo Harju
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.)
Lohja Oy AB
Original Assignee
Lohja Oy 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 Lohja Oy AB filed Critical Lohja Oy AB
Publication of EP0101702A1 publication Critical patent/EP0101702A1/en
Application granted granted Critical
Publication of EP0101702B1 publication Critical patent/EP0101702B1/en
Expired 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0267—Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
    • 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
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0275—Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current

Definitions

  • the present invention concerns a method in accordance with the preamble of claim 1.
  • the invention also concerns a wiring system to be used for the implementation of this method.
  • An AC electroluminescent display based on the thin film technique comprises a bi-dimensional matrix, in respect of the drive circuits, consisting of X and Y electrodes, in which matrix the X electrodes form lines and the Y electrodes, on the other hand, form columns.
  • each line in its turn receives a high-amplitude line selection pulse while the other lines are floating.
  • a modulation voltage corresponding to the desired luminance is applied to the columns.
  • a refresh pulse of reversed polarity is applied simultaneously to all lines.
  • the method described in the reference publication (2) corresponds to the former method regarding its withstand voltage requirements.
  • the methods differ from each other in the respect that, in the former method, high-voltage pulses are applied to the ground point of the line drive circuits, and the ground point of the column drive circuits is connected to the ground point of the entire drive system.
  • the ground point of the line drive circuits is connected to the system ground, and the high-voltage pulses are applied to the ground point of the column drive circuits.
  • the object of the present invention is to eliminate the drawbacks occurring in the systems of prior art.
  • a further object of the invention to provide a refresh method for driving particularly an AC electroluminescent display based on the thin film technique, which refresh method lowers the requirements of withstand voltage to be imposed on the drive circuits of the display, reduces the power consumption of the display, and permits a drive voltage completely free from a DC voltage component.
  • a further object is to provide a wiring system for the implementation of the method.
  • the invention is based, e.g., on the following ideas:
  • the withstand voltage required both from the line drive circuits and from the column drive circuits is only equal to the maximum values of the modulation voltages, about 30 V.
  • the prior art refresh methods have required a withstand voltage of about 60 V from the column drive circuits and a withstand voltage of about 200 V from the line drive circuits.
  • a lower withstand voltage requirement facilitates the integration and results in less expensive and more reliable circuits.
  • Both of the drive circuits may be of the same type, which reduces the number of circuit types to be integrated.
  • the drive voltage of the display does not contain a DC voltage component, which increases the service life of the display.
  • the power consumption of the display is low, because the amplitude of the line selection pulses and of the column modulation pulses is low and because the frequency of the basic voltage may be low, even lower than 25 Hz.
  • the display matrix comprises the lines X1 and X2 as well as the columns Y1 and Y2.
  • the display elements C11, C12, C21 and C22 are located.
  • the voltages measured at the elements from the X electrodes to the Y electrodes are denoted with U c11 , U c12 , U c21 and U c22 , respectively.
  • the ground point SE of the column drive circuits SA is preferably connected to the ground point JE of the entire drive system.
  • the ground point RE of the line drive circuits RA is connected to the AC voltage U B generated by the AC voltage source B.
  • the formation of the drive voltages of the display elements C11, C12, C21 and C22 is examined at a moment at which the line x2 is in the selected state.
  • U B is positive
  • the selected line x2 receives the voltage ⁇ s + U RM
  • the non-selected line X1 receives the voltage ⁇ B .
  • the selected column Y2 is connected to the ground point SE and the non-selected column Y1 to the voltage U SM .
  • the positive amplitude of the basic voltage (U BIAS ) is formed by subtracting the maximum value U SM of the column modulation voltages from the positive peak value ⁇ B of the AC voltage.
  • the selected line X2 is connected to the voltage -O B and the non-selected line to the voltage - ⁇ B + U RM .
  • the selected column Y2 is now connected to the voltage U SM and the non-selected column Y1 to the ground, so that the absolute value of the negative amplitude of the basic voltage (T BIAS ) is equal to the peak value ⁇ B of the AC voltage reduced by the line selection voltage U RM . From Fig.
  • the line selection voltage U RM and the maximum value U SM of the column modulation voltages are equally high in the example of Figures 1 and 2. They may also be different. Symmetry of the drive voltage can then be maintained by selecting the positive and the negative amplitude of the AC voltage U B to differ as to their magnitudes by the difference between the line selection voltage U RM and the maximum value U SM of the column modulation voltages.
  • the non-selected lines are always connected either to the positive pole or to the negative pole of the line selection voltage source RM depending on the phase of the AC voltage U B . If the line selection voltage U RM is selected at least twice as high as the maximum value U SM of the column modulation voltages, the non-selected lines may be allowed to float while the selected line receives the selection pulse. This reduces the power consumption.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
EP19830900715 1982-02-17 1983-02-17 Method and wiring system for driving a picture display, particularly an ac electroluminescent display Expired EP0101702B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI820522A FI64248C (fi) 1982-02-17 1982-02-17 Foerfarande och koppling foer styrning av bildaotergivning ochisynnerhet vaexelstroems-elektroluminensaotergivning
FI820522 1982-02-17

Publications (2)

Publication Number Publication Date
EP0101702A1 EP0101702A1 (en) 1984-03-07
EP0101702B1 true EP0101702B1 (en) 1986-02-12

Family

ID=8515126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830900715 Expired EP0101702B1 (en) 1982-02-17 1983-02-17 Method and wiring system for driving a picture display, particularly an ac electroluminescent display

Country Status (6)

Country Link
EP (1) EP0101702B1 (enrdf_load_stackoverflow)
JP (1) JPS59500289A (enrdf_load_stackoverflow)
DE (1) DE3332440T1 (enrdf_load_stackoverflow)
FI (1) FI64248C (enrdf_load_stackoverflow)
GB (1) GB2127199B (enrdf_load_stackoverflow)
WO (1) WO1983003021A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3619366A1 (de) * 1985-06-10 1986-12-11 Sharp K.K., Osaka Treiberschaltung fuer eine duennfilm-el-anzeigeeinrichtung

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60249191A (ja) * 1984-05-24 1985-12-09 シチズン時計株式会社 表示駆動回路
DE3782858T2 (de) * 1986-06-17 1993-04-08 Fujitsu Ltd Ansteuerung fuer eine anzeigevorrichtung in matrix-form.
GB2194663B (en) * 1986-07-18 1990-06-20 Stc Plc Display device
JP2647859B2 (ja) * 1987-09-16 1997-08-27 シャープ株式会社 薄膜ｅｌ表示装置
JPH0748143B2 (ja) * 1988-12-28 1995-05-24 シャープ株式会社 表示装置の駆動方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5327099B2 (enrdf_load_stackoverflow) * 1973-10-03 1978-08-05
US4237456A (en) * 1976-07-30 1980-12-02 Sharp Kabushiki Kaisha Drive system for a thin-film EL display panel
US4275336A (en) * 1979-03-05 1981-06-23 International Business Machines Corporation Method of improving the memory effect and brightness of an alternating current excited thin film electroluminscent device
JPS5714889A (en) * 1980-06-30 1982-01-26 Fujitsu Ltd Matrix display unit driving method
FI62447C (fi) * 1981-04-22 1982-12-10 Lohja Ab Oy Foerfarande foer styrning av bildaotergivning och i synnerhet vaexelstroemselektroluminensaotergivning

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3619366A1 (de) * 1985-06-10 1986-12-11 Sharp K.K., Osaka Treiberschaltung fuer eine duennfilm-el-anzeigeeinrichtung

Also Published As

Publication number Publication date
FI64248B (fi) 1983-06-30
JPS59500289A (ja) 1984-02-23
EP0101702A1 (en) 1984-03-07
DE3332440T1 (de) 1984-02-09
FI64248C (fi) 1983-10-10
JPH0220994B2 (enrdf_load_stackoverflow) 1990-05-11
WO1983003021A1 (en) 1983-09-01
GB8327190D0 (en) 1983-11-09
GB2127199A (en) 1984-04-04
GB2127199B (en) 1986-07-16

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