EP0635819A1 - Verfahren und Einrichtung zur Steuerung einer Mikrospitzenanzeigevorrichtung - Google Patents

Verfahren und Einrichtung zur Steuerung einer Mikrospitzenanzeigevorrichtung Download PDF

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Publication number
EP0635819A1
EP0635819A1 EP94401670A EP94401670A EP0635819A1 EP 0635819 A1 EP0635819 A1 EP 0635819A1 EP 94401670 A EP94401670 A EP 94401670A EP 94401670 A EP94401670 A EP 94401670A EP 0635819 A1 EP0635819 A1 EP 0635819A1
Authority
EP
European Patent Office
Prior art keywords
voltages
screen
columns
column
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.)
Granted
Application number
EP94401670A
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English (en)
French (fr)
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EP0635819B1 (de
Inventor
Denis Sarrasin
Michel Garcia
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.)
Pixtech SA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Pixel International SA
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.)
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Publication date
Application filed by Commissariat a lEnergie Atomique CEA, Pixel International SA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0635819A1 publication Critical patent/EP0635819A1/de
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Publication of EP0635819B1 publication Critical patent/EP0635819B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Definitions

  • the present invention relates to a method and a device for controlling a matrix display screen intended for displaying images having different gray levels, of the fluorescent microtip screen type.
  • the images can be in black and white or in color, the expression "gray level” meaning in the latter case “color halftone”.
  • Microtip fluorescent screens are known and in particular described by R. Meyer in the article entitled “Microtips Fluorescent Display” (“Japan Display” 86, page 512).
  • Circuits of the digital type present precisely the advantage of having a very low own consumption since they operate like as many switches, without requiring bias current and with very short response times.
  • the object of the invention is to propose a method and a device for controlling a matrix display screen of the fluorescent micropoint screen type, making it possible to solve the various problems defined above.
  • the invention relates to a method for controlling a fluorescent microtip screen composed of pixels arranged in L lines and M columns of images capable of comprising a discrete number of Q shades of gray, said method comprising each time a line is selected of the screen during a line selection time T L , the application simultaneously to the columns of the screen of voltages corresponding to the gray levels to be displayed at the image points corresponding to the intersection of said line and said columns, characterized in that that the different column voltage values that can be applied to the columns are chosen from a strictly increasing sequence of N + 1 values such that the line selection time is subdivided into S equal time intervals ⁇ t, each voltage value is applied an integer of times ⁇ t, (NxS) +1 representing the number Q of gray levels, with N ⁇ 2 and S ⁇ 2, and in that during a selection time line T L and as a function of the gray level to be displayed at an image point, the corresponding column voltage takes a first value Va during a certain number of time intervals ⁇ t, then if necessary during the remaining time
  • an addressing mode which presents both the time and voltage modulation possibilities offered by the electro-optical response of fluorescent microtip screens. Beyond the emission threshold, the luminance obtained is indeed proportional to (VxT), V being the applied cathode grid voltage and T the duration of the application of this voltage. Thanks to the present invention, the consumption advantages of the digital circuits and of the analog addressing mode are combined while allowing the selection of a large number of gray levels.
  • the sequencer provides the index P of the addressing sequence within a line time, this index P being coded on (kh) bits.
  • This sequencer is advantageously a counter whose clock includes 2 (kh) pulses per line time, this counter being initialized at each line time.
  • the generator of N + 1 discrete voltages can consist of operational amplifiers mounted as follower amplifiers, with input voltages fixed by a resistive divider bridge (R1, R2, ........, RN). In the case of a linear distribution of the voltages, the resistors all have the same value.
  • the generator of N + 1 discrete voltages can also be built around one or more analog digital converters, themselves controlled by a controller responsible for calculating the values of N + 1 voltages.
  • a monochrome or color palette circuit can also make it possible to manage the generator of discrete voltages according to user demand.
  • the invention relates to a method for controlling a fluorescent microtip screen composed of pixels arranged in L lines and M columns of images capable of comprising a discrete number of shades of gray.
  • the columns are controlled by signals intended to activate them. These column signals allow the selection of a voltage Vi chosen from N + 1 with N ⁇ 2 and 0 ⁇ i ⁇ N.
  • N + 1 voltages Vi are chosen such that their values form a strictly increasing sequence.
  • the column signal During a line selection time T L and as a function of the gray level to be displayed, the column signal must take a first voltage value Va during a certain number of time intervals ⁇ t, then if necessary during the intervals time remaining, at most one second voltage value Vb, this second value being consecutive to the first in the series of N voltages.
  • the rank 1 gray shade is obtained by applying a voltage V1 for a time ⁇ t
  • the rank 2 gray shade will be obtained by applying the voltage V1 for a time ⁇ t + ⁇ t, and for to obtain the shade of gray of rank S, it will have to be applied for S times the time ⁇ t.
  • the rank gray tint (S + 1) will be obtained by applying a voltage V2 for a time ⁇ t and the voltage V1 during the (S - 1) other time intervals.
  • Vi ix (V N / N)
  • the luminance / voltage response (line / column or grid / cathode V GC ) of a fluorescent microtip screen being of the type of that of FIG. 2, using equal time intervals and judiciously chosen voltages, we can match this response in successive ranges to the desired curve.
  • one and only one voltage sequence can be found from a luminance / voltage response curve.
  • We can thus perform a gamma correction for the television application or fulfill the function of a pallet circuit for computer-type applications.
  • the method of the invention applies to the specific case of microtip screens.
  • the electro-optical response of these screens differs from that of active matrix liquid crystal (TFT) screens. Indeed for a TFT type screen, a voltage is charged for a line time which is then kept on the pixel for a whole frame (complete scanning of the image), this voltage driving the tilting of the molecules, and therefore the modulation of the light transmitted throughout the frame.
  • TFT active matrix liquid crystal
  • the electro-optical response is made immediately during the line selection time and the pixel considered only emits during this line time.
  • the voltage applied to a selected line brings the line / column voltage to the limit of the emission threshold (while the line / column voltage for an unselected line is always below this threshold). Also, the voltage applied to a column, during this row selection time, immediately causes a more or less significant emission (depending on the luminance / voltage curve). The transmission therefore takes place only during the line selection time.
  • the method described in the invention relies on this characteristic to propose a construction of the gray levels by box.
  • patent application EP-0 478 386 practice limits the discrete number of usable external voltages Vi.
  • Q (SxN) +1 gray levels, (from 0 to Q-1) by the simultaneous selection of 0, 1, 2, or (Q-1) boxes.
  • the method of the invention digitizes the row / column voltage selection time space by cutting this time into S predefined equal time intervals so that the switching between two selected voltages can be made at the start of any what interval.
  • the column control switches between two neighboring voltages from a generator.
  • the purpose of this switching being the storage on the capacitor of a pixel of an intermediate voltage at the two selected voltages, this intermediate voltage is obtained by using the charging time of said capacitor through its control transistor by playing on the moment of charge.
  • the switching between the two selected voltages is found rather at the end of the line selection time.
  • FIGS. 3A and 3B are intended to help better understand the possibility of adjusting the differences between the N voltages.
  • FIG. 3A shows the distribution of the luminances L obtained in the case of deviations of equal voltages V.
  • FIG. 3B shows a linear distribution of the luminances L obtained by adjusting these voltages V.
  • the circuits 13 for controlling the columns of the screen are conventionally constituted by a shift register 16 of k inputs and kx M outputs, each output being associated with a storage flip-flop 17.
  • each control circuit of a column includes a part of the shift register and k flip-flops.
  • Each word K thus memorized in the k flip-flops of a control circuit of a column must be able to validate the control of a voltage chosen from N + 1.
  • the control circuit therefore comprises multiplexing means. The original part of the device concerns these means.
  • FIG. 5 illustrates the constitution of the multiplexing means specific to the invention.
  • These means include a circuit n bit binary decoder 22 (1 among 2 n ), a comparator 24, a combinational logic circuit 25 and N + 1 analog switches 21 whose outputs are all connected to the column output Sc of the channel considered and the analog inputs are connected to the generator 14.
  • the validation inputs of these switches are determined as described below:
  • the word H is used to determine the pair of voltages (Vi, Vi + 1) adapted to the gray level to be displayed and supplies the circuit 22 binary decoder n bits 1 among 2 n to produce the N signals H0 to H N-1 which translate the coding of H.
  • This sequencer which supplies the index P of the addressing sequence within a line time, P being coded on (kh) bits.
  • This sequencer can for example be a counter 23 whose CPG clock comprises 2 (kh) pulses per line time, this counter 23 being initialized at each line time ("load" signal).
  • This counter 23 can be an external counter or a counter per circuit.
  • E be a coding bit
  • the generator 14 of N + 1 discrete voltages can be, for example, made up of N + 1 operational amplifiers 30 mounted as followers, with input voltages fixed by a resistive divider bridge R1, R2, ..., RN.
  • the extreme voltages V0 and V N are obtained directly (without adaptation of impedance by an operational amplifier mounted as a follower ) from said terminals.
  • the resistors R1-RN will all have the same value, otherwise their ratio will be calculated according to the values V0 to V N desired.
  • this generator of N + 1 discrete voltages can also be built, as shown in FIG. 7, around one or more analog digital converters 31, themselves controlled by a controller 32 responsible for calculating the values of N + 1 voltages , and followed by amplifiers 33.
  • circuit palette In cathode ray tube applications, you can generally choose to display a certain number of colors (or grayscale for a monochrome screen) chosen from a much larger number, this functionality is generally fulfilled by a specific circuit called "circuit palette". This operation is possible within the framework of the invention, the pallet circuit is then asked to manage the generator of discrete voltages and therefore the pallet according to the request of the user.

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  • 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)
EP94401670A 1993-07-22 1994-07-20 Verfahren und Einrichtung zur Steuerung einer Mikrospitzenanzeigevorrichtung Expired - Lifetime EP0635819B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9309022 1993-07-22
FR9309022A FR2708129B1 (fr) 1993-07-22 1993-07-22 Procédé et dispositif de commande d'un écran fluorescent à micropointes.

Publications (2)

Publication Number Publication Date
EP0635819A1 true EP0635819A1 (de) 1995-01-25
EP0635819B1 EP0635819B1 (de) 1998-11-25

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EP94401670A Expired - Lifetime EP0635819B1 (de) 1993-07-22 1994-07-20 Verfahren und Einrichtung zur Steuerung einer Mikrospitzenanzeigevorrichtung

Country Status (6)

Country Link
US (1) US5555000A (de)
EP (1) EP0635819B1 (de)
JP (2) JP3969748B2 (de)
CA (1) CA2128357A1 (de)
DE (1) DE69414771T2 (de)
FR (1) FR2708129B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692778A1 (de) * 1994-06-30 1996-01-17 Motorola, Inc. Verfahren zum Steuern einer Elektronenquelle
EP1018134A1 (de) * 1997-09-26 2000-07-12 Candescent Technologies Corporation Eine schaltung und steuerungsverfahren
FR2907959A1 (fr) * 2006-10-30 2008-05-02 Commissariat Energie Atomique Procede de commande d'un dispositif de visualisation matriciel a source d'electrons a consommation capacitive reduite

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GB9404013D0 (en) * 1994-03-02 1994-04-20 Inmos Ltd Current generating unit
KR100266517B1 (ko) * 1995-07-07 2000-09-15 가네꼬 히사시 전계 방출 냉 캐소드 및 개선된 게이트 구조를 갖는 전자 총
US5867136A (en) * 1995-10-02 1999-02-02 Micron Display Technology, Inc. Column charge coupling method and device
US6118417A (en) * 1995-11-07 2000-09-12 Micron Technology, Inc. Field emission display with binary address line supplying emission current
FR2762704B1 (fr) * 1997-04-25 1999-07-16 Thomson Multimedia Sa Procede d'adressage pour ecran a plasma base sur une repetition de bits sur une ou plusieurs lignes
US6069598A (en) * 1997-08-29 2000-05-30 Candescent Technologies Corporation Circuit and method for controlling the brightness of an FED device in response to a light sensor
US6069597A (en) * 1997-08-29 2000-05-30 Candescent Technologies Corporation Circuit and method for controlling the brightness of an FED device
US6169529B1 (en) 1998-03-30 2001-01-02 Candescent Technologies Corporation Circuit and method for controlling the color balance of a field emission display
FR2786597B1 (fr) * 1998-11-27 2001-02-09 Pixtech Sa Adressage numerique d'un ecran plat de visualisation
JP2000306532A (ja) * 1999-04-22 2000-11-02 Futaba Corp 多重アノードマトリックス方式蛍光表示管、およびその駆動装置
JP2001109421A (ja) * 1999-10-04 2001-04-20 Matsushita Electric Ind Co Ltd 表示パネルの階調駆動方法および駆動装置
US6587086B1 (en) 1999-10-26 2003-07-01 Semiconductor Energy Laboratory Co., Ltd. Electro-optical device
US6639605B2 (en) * 1999-12-17 2003-10-28 Koninklijke Philips Electronics N.V. Method of and unit for displaying an image in sub-fields
JP3681121B2 (ja) 2001-06-15 2005-08-10 キヤノン株式会社 駆動回路及び表示装置
JP3647426B2 (ja) 2001-07-31 2005-05-11 キヤノン株式会社 走査回路及び画像表示装置
US20030058196A1 (en) * 2001-09-26 2003-03-27 Hansen Ronald L. Method for reducing power consumption in field emission display devices by efficiently controlling column driver output voltage
JP3697412B2 (ja) * 2001-12-27 2005-09-21 株式会社東芝 電子ビーム発生装置
JP2004004788A (ja) * 2002-04-24 2004-01-08 Seiko Epson Corp 電子素子の制御回路、電子回路、電気光学装置、電気光学装置の駆動方法、及び電子機器、並びに電子素子の制御方法
JP4123037B2 (ja) * 2002-04-24 2008-07-23 セイコーエプソン株式会社 電気光学装置及びその駆動方法、並びに電子機器
JP3679784B2 (ja) * 2002-06-13 2005-08-03 キヤノン株式会社 画像表示素子の変調装置および画像表示装置
JP3715967B2 (ja) 2002-06-26 2005-11-16 キヤノン株式会社 駆動装置及び駆動回路及び画像表示装置
GB0218172D0 (en) * 2002-08-06 2002-09-11 Koninkl Philips Electronics Nv Electroluminescent display device
JP4040454B2 (ja) * 2002-12-27 2008-01-30 キヤノン株式会社 画像表示装置
JP4136670B2 (ja) * 2003-01-09 2008-08-20 キヤノン株式会社 マトリクスパネルの駆動制御装置及び駆動制御方法
JP2005043865A (ja) * 2003-07-08 2005-02-17 Seiko Epson Corp 表示装置の駆動方法及び駆動装置
JP2005157203A (ja) * 2003-11-28 2005-06-16 Tohoku Pioneer Corp 発光表示パネルの駆動装置および駆動方法
JP2005257791A (ja) * 2004-03-09 2005-09-22 Canon Inc 画像表示装置及び画像表示装置の駆動方法
JP2005292804A (ja) 2004-03-10 2005-10-20 Canon Inc 制御装置及び画像表示装置
US7522132B2 (en) 2004-03-17 2009-04-21 Canon Kabushiki Kaisha Image display apparatus
JP4174494B2 (ja) 2004-06-30 2008-10-29 キヤノン株式会社 駆動装置、画像表示装置及びテレビジョン装置
JP2006106147A (ja) * 2004-09-30 2006-04-20 Toshiba Corp 表示装置及び表示方法
FR2880173B1 (fr) * 2004-12-28 2007-05-11 Commissariat Energie Atomique Procede de commande d'un ecran de visualisation matriciel
FR2899991B1 (fr) * 2006-04-14 2009-03-20 Commissariat Energie Atomique Procede de commande d'un dispositif de visualisation matriciel a source d'electrons
JP2009109641A (ja) * 2007-10-29 2009-05-21 Canon Inc 駆動回路、及びアクティブマトリクス型表示装置
JP6247446B2 (ja) * 2013-02-26 2017-12-13 株式会社半導体エネルギー研究所 発光装置の駆動方法

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EP0478386A2 (de) * 1990-09-28 1992-04-01 Sharp Kabushiki Kaisha Steuerschaltung für ein Anzeigegerät
EP0479450A2 (de) * 1990-10-01 1992-04-08 Raytheon Company Helligkeitsregelung für eine flache Anzeigeeinrichtung
EP0600499A1 (de) * 1992-12-02 1994-06-08 Nec Corporation Steuerschaltung für Flüssigkristallanzeigevorrichtung

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JP2695981B2 (ja) * 1990-10-05 1998-01-14 株式会社東芝 液晶表示器駆動電源回路
JPH05100635A (ja) * 1991-10-07 1993-04-23 Nec Corp アクテイブマトリクス型液晶デイスプレイの駆動用集積回路と駆動方法

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Publication number Priority date Publication date Assignee Title
EP0478386A2 (de) * 1990-09-28 1992-04-01 Sharp Kabushiki Kaisha Steuerschaltung für ein Anzeigegerät
EP0479450A2 (de) * 1990-10-01 1992-04-08 Raytheon Company Helligkeitsregelung für eine flache Anzeigeeinrichtung
EP0600499A1 (de) * 1992-12-02 1994-06-08 Nec Corporation Steuerschaltung für Flüssigkristallanzeigevorrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692778A1 (de) * 1994-06-30 1996-01-17 Motorola, Inc. Verfahren zum Steuern einer Elektronenquelle
EP1018134A1 (de) * 1997-09-26 2000-07-12 Candescent Technologies Corporation Eine schaltung und steuerungsverfahren
EP1018134A4 (de) * 1997-09-26 2001-02-21 Candescent Tech Corp Eine schaltung und steuerungsverfahren
FR2907959A1 (fr) * 2006-10-30 2008-05-02 Commissariat Energie Atomique Procede de commande d'un dispositif de visualisation matriciel a source d'electrons a consommation capacitive reduite
WO2008052945A1 (fr) * 2006-10-30 2008-05-08 Commissariat A L'energie Atomique Procede de commande d'un dispositif de visualisation matriciel a source d'electrons a consommation capacitive reduite
US8477156B2 (en) 2006-10-30 2013-07-02 Commissariat A L'energie Atomique Method of driving a matrix display device having an electron source with reduced capacitive consumption

Also Published As

Publication number Publication date
DE69414771T2 (de) 1999-06-10
DE69414771D1 (de) 1999-01-07
FR2708129B1 (fr) 1995-09-01
JP3977412B2 (ja) 2007-09-19
EP0635819B1 (de) 1998-11-25
US5555000A (en) 1996-09-10
JP2007140552A (ja) 2007-06-07
JPH07181917A (ja) 1995-07-21
FR2708129A1 (fr) 1995-01-27
CA2128357A1 (en) 1995-01-23
JP3969748B2 (ja) 2007-09-05

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