EP0734043B1 - Doppel-Gate-Flaches Bildschirm - Google Patents

Doppel-Gate-Flaches Bildschirm Download PDF

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Publication number
EP0734043B1
EP0734043B1 EP96410030A EP96410030A EP0734043B1 EP 0734043 B1 EP0734043 B1 EP 0734043B1 EP 96410030 A EP96410030 A EP 96410030A EP 96410030 A EP96410030 A EP 96410030A EP 0734043 B1 EP0734043 B1 EP 0734043B1
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EP
European Patent Office
Prior art keywords
gate
addressed
cathode
comb
grid
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 - Lifetime
Application number
EP96410030A
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English (en)
French (fr)
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EP0734043A1 (de
Inventor
Bernard Bancal
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Pixtech SA
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Pixtech SA
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Publication date
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Publication of EP0734043B1 publication Critical patent/EP0734043B1/de
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/127—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using large area or array sources, i.e. essentially a source for each pixel group

Definitions

  • the present invention relates to the production of a flat display screen. It applies more particularly to a flat screen of the type comprising a bombardment cathode electronics of an anode carrying phosphor elements. It is, for example, a fluorescent screen in which an electronic emission is obtained by extraction of electrons microtips or a thin film, for example a film carbon-diamond.
  • Figure 1 shows the functional structure a microtip flat screen of the type to which it relates the invention.
  • Such a microtip screen essentially consists a cathode 1 with microtips 2 and a grid 3 provided of holes 4 corresponding to the locations of the microtips 2.
  • Cathode 1 is placed opposite a cathode-luminescent anode 5 of which a glass substrate 6 constitutes the surface screen.
  • Cathode 1 is organized in columns and is made up, on a substrate 10, for example made of glass, of conductors cathodes organized in mesh from a conductive layer.
  • the microtips 2 are made on a resistive layer 11 deposited on the cathode conductors and are arranged inside the meshes defined by the conductors of cathode.
  • Figure 1 partially showing the interior of a mesh, the cathode conductors do not appear on this figure.
  • Cathode 1 is associated with grid 3 which is it organized in rows, an insulating layer (not shown) being interposed between the cathode conductors and the grid 3. The intersection of a row of grid 3 and a column of cathode 1, defines a pixel.
  • This device uses the electric field created between cathode 1 and grid 3 so that electrons are extracts from microtips 2 to phosphor elements 7 of the anode 5 by crossing an inter-electrode empty space 12.
  • the anode 5 is provided with strips alternating phosphor elements 7, each corresponding to a color (Blue, Red, Green).
  • the bands are separated from each other by an insulator 8.
  • the phosphor elements 7 are deposited on electrodes 9, made up of corresponding bands a transparent conductive layer such as indium tin oxide (ITO). Tape sets blue, red, green are alternately polarized with respect at cathode 1, so that the electrons extracted from the microtips 2 of a pixel of the cathode / grid are alternately directed towards the phosphor elements 7 opposite each of the colors.
  • ITO indium tin oxide
  • the display of an image is done by suitably polarizing the anode, the cathode and the grid by means of a control electronics (not shown).
  • the rows of grid 3 are sequentially polarized at a potential of the order of 80 volts while the strips of phosphor elements (for example 7g in Figure 1) to be excited are biased under a voltage of the order of 400 volts, the other bands (for example 7r and 7b in FIG. 1) being at zero potential.
  • the columns of the cathode 1, whose potential represents for each row of grid 3 the brightness of the pixel defined by the intersection of the cathode column and the grid row in the color considered, are brought to respective potentials between a maximum emission potential and a potential no emission (for example, 0 and 30 respectively volts).
  • the choice of the values of the polarization potentials is related to the characteristics of phosphor elements 7 and microtips 2. Conventionally, below a difference of potential of 50 volts between cathode 1 and grid 3, there has no electronic emission and the maximum emission used corresponds to a potential difference of 80 volts.
  • a disadvantage of conventional screens is that the individual addressing of the rows of grid 3 requires a row connection to the control electronics. Electronics must therefore include an output stage by grid row which increases the cost. The output stages associated with the grid must also support tensions up to 100 volts which makes them relatively Dear. In addition, the silicon surface being proportional squared of the breakdown voltage, such stages of output, realized in the form of integrated circuit, require relatively large areas.
  • the present invention aims to overcome these drawbacks by offering a flat display screen in which the number of output stages and connections intended for the addressing of the grid is less than the number of lines of the screen.
  • the invention also aims to allow the realization a high definition screen with small dimensions.
  • the invention further aims to propose the realization of such a flat display screen which does not require modification of the cathode and the anode, nor of the elements of the control electronics associated with the cathode or the anode.
  • the present invention provides a flat display screen of the type comprising a cathode organized in columns of electronic bombardment an anode provided with phosphor elements, and comprising a first grid organized in rows likely to be addressed individually and a second grid consisting of at least at least two alternating track combs parallel to said rows of said first grid, the same row of said first grid being associated with a track of each comb and the intersection of each track with a cathode column defining a screen pixel.
  • an image is displayed, in an interlaced manner, by sequentially addressing said rows of the first grid during the duration of an alternative addressing of said second grid combs.
  • the cathode columns are addressed simultaneously to each row of the first grid, their potential being a function of the desired brightness for the pixel defined by their intersection with the comb track addressed from the second grid which is plumb with the current row.
  • the polarization potentials of said combs are chosen so that the tracks of an addressed comb focus, towards the anode, the electrons emitted from the cathode columns at plumb with the track of said focusing comb associated with a addressed row, and so that the tracks of a comb that is not addressed collect the electrons emitted from the columns of the cathode directly above the track of said associated collecting comb to the row addressed.
  • the potential of a focusing comb is greater than potential of the rows of the first grid which are not addressed, the potential of a collecting comb being lower to the potential of the rows of the first grid which are not addressed.
  • the pitch of the rows of the first grid is dimensioned depending on the minimum pitch to be respected between connections individual of these rows towards an electronics of control, the number of combs of the second grid being chosen according to the desired definition for the screen.
  • said grids are applied to a color screen of which the anode is provided with three sets of alternating bands phosphor elements each corresponding to a color.
  • said grids are applied to a monochrome screen the anode of which consists of phosphor elements of a single type.
  • the main idea of the present invention is to associate with the screen cathode two superimposed and addressed grids differently.
  • Figure 2 illustrates, by a top view of a cathode plate / grid of a microtip screen, a mode of realization of the present invention.
  • a first grid 20 is similar to the grid (3, Figure 1) with which conventional screens are provided, unlike close that the width of its rows 21 corresponds to the minus two screen pixels. Rows 21 of this first grid 20 are addressed individually and are therefore connected individually by one of their ends to an electronic control (not shown).
  • a second grid 23 is attached to this first wire rack.
  • This second grid 23 consists of at least two combs 24 and 25 of conductive tracks, respectively 26 and 27, alternate.
  • One track of each comb is located at plumb with a row 21 of the first grid 20 so that each row 21 is covered with two tracks 26 and 27 of the second grid 23.
  • all tracks 26, respectively 27, are likely to be addressed simultaneously by being linked together to the electronics control.
  • a pixel of the screen is defined here by the intersection a column, or a conductor 28, of the cathode 1 with a track 26 or 27 of the second grid 23.
  • Rows 21 of the first grid 20 and the tracks 26 and 27 of the second grid 23 are provided with holes 4 to the location of the microtips arranged on conductors 28 of cathode 1 organized in columns. For reasons of clarity, only one hole 4 per pixel has been shown in Figure 2 while in practice the number of holes 4 corresponds to the number of microtips and is several thousand per pixel. Of even, the mesh of cathode conductors 28 has not been represented.
  • Each grid is, for example, made up a layer of niobium etched in the appropriate pattern.
  • a isolation layer, engraved directly above each microtip, is interposed between the cathode 1 and the first grid 20 and, between the first grid 20 and the second grid 23.
  • each comb 24 or 25 of the second grid 23 is to allow, alternatively, depending on whether it is or unaddressed, focusing of electrons emitted by microtips which are plumb with row 21 addressed from the first grid 20 and track 26, respectively 27, addressed, or collecting the electrons emitted by the microtips which are directly above the addressed row 21 and runway 27, respectively 26, not addressed.
  • An image is displayed for a period of time frame (for example 20 ms) by suitably polarizing anode, cathode and grids by means of electronics control.
  • a period of time frame for example 20 ms
  • the strips of phosphor elements 7 of anode 5 are sequentially polarized, during a frame, by sets of bands of the same color, either for a subframe duration corresponding to one third of the frame time (eg 6.6 ms).
  • the display is carried out line by line but interlaced, during each subframe.
  • a "line time” (for example 13.7 ⁇ s) corresponds the duration of a subframe divided by the number of rows 21 of the first grid 20 multiplied by the number of second grid combs 23.
  • the electrons, emitted by the microtips located below the track (for example 27) of the other comb (for example 25) and of the current row 21 of the first grid 20, are collected by this track (for example 27).
  • FIG. 3 represents, partially and in exploded perspective, a conductor 28 of cathode 1 and the two grids 20 and 23 according to the invention. As in Figure 2, only a microtip 2 and a hole 4 per pixel have been shown.
  • the potential V G of a row 21 of the first grid 20 which is addressed is, as for conventional screens, for example of 80 volts while it is 0 volts for the rows 21 which are not addressed.
  • the potential V K of the columns 28 of the cathode is, as for conventional screens, for example between 0 and 30 volts depending on the desired brightness for the pixel considered.
  • the potential V f of the tracks of an addressed comb is greater than the potential of the rows 21 which are not addressed. If the first grid 20 is polarized between 0 and 80 volts, we will choose, for example, a potential V f of the order of 5 volts for the focusing comb.
  • the potential V c thereof is lower than the potential of the rows 21 which are not addressed. If the first grid 20 is polarized between 0 and 80 volts, we will choose, for example, a potential V c of the order of -5 volts for the collector comb.
  • the number of combs of the second grid 23 is chosen according to the number of output stages, or connections, desired for grids and / or desired definition for the screen in the direction of columns 28 of the cathode 1 and / or the form in which the instructions arrive of luminance in the control electronics.
  • the second grid 23 is made up of three combs with one comb per color.
  • the second grid 23 has a greater number of combs. For example, we can consider having the scanned image saved in a frame memory whose content can be easily read by jumps of eight. It will then be possible, advantageously, to provide eight combs for the second grid 23 and thus allow view eight successive interlaced subframes.
  • An advantage of the present invention is that for a screen of a given number N of lines, the number of output stages control electronics associated with the grids, therefore grid connections to control electronics, is M + N / M, where M represents the number of combs of the second grid 23.
  • M represents the number of combs of the second grid 23.
  • a screen, according to the invention, of 288 rows by 360 columns of which the second grid has two combs can be made in using 146 (144 for rows 21 and 2 for combs 24 and 25) output stages and connections associated with grids.
  • Another advantage of the present invention is that it makes it possible to reduce the number of output stages and connections without modifying the cathode structure and of the screen anode, nor of the associated control electronics at the cathode and at the anode.
  • Another advantage of the present invention is that it enables high definition screens and small dimensions, where at least one of the dimensions of a pixel is less than the minimum pitch between the row connections grid. Indeed, for a screen produced with a pitch of rows 21 of the first grid 20 which corresponds to the minimum pitch feasible (for example 200 ⁇ m), the implementation of the invention increases the definition of the screen, at least in the direction perpendicular to the rows of the grid, by factor of M corresponding to the number of combs of the second grid 23. In the example shown in Figures 2 and 3, this is equivalent to doubling the screen definition in this direction.
  • the connections of the cathode and / or first grid columns on allow.
  • a square screen of 1024 pixels per side can, be made on a 10 cm side surface.
  • the step of pixels is then of the order of 0.1 mm.
  • the step of rows 21 of the first grid is 0.2 mm which is compatible with the no minimum of conventional connections.
  • Each track 26 or 27 of the second grid 23 has, for example, a width of around 75 ⁇ m and two neighboring tracks are distant about 25 ⁇ m.
  • the invention also applies to a screen fluorescent whose cathode is made from a film, for example carbon-diamond, electronic emission.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Claims (8)

  1. Anzeige- bzw. Wiedergabe-Flachbildschirm des Typs mit einer in Spalten (28) organisierten Kathode (1) zum Elektronenbeschuß bzw. -bombardement einer mit Leuchtstoffelementen (7) versehenen Anode (5),
    dadurch gekennzeichnet, daß der Bildschirm ein erstes Gitter (20), das in individuell adressierbaren bzw. ansteuerbaren Reihen bzw. Zeilen (21) organisiert ist, sowie ein zweites Gitter (23) aufweist, das aus wenigstens zwei Kammstrukturen (24, 25) von abwechselnden, zu den Reihen bzw. Zeilen (21) des ersten Gitters (20) parallelen Bahnen (26, 27) besteht, wobei ein und dieselbe Reihe bzw. Zeile (21) des genannten ersten Gitters (20) jeweils einer Bahn (26, 27) jedes Kamms (24, 25) zugeordnet ist und der Schnittpunkt jeweils einer Bahn (26, 27) mit einer Spalte (28) der Kathode (1) ein Bildschirmpixel definiert.
  2. Anzeige- bzw. Wiedergabe-Flachbildschirm nach Anspruch 1,
    dadurch gekennzeichnet, daß die Anzeige eines Bildes in ineinander verschränkter bzw. verflochtener Form erfolgt, mittels aufeinanderfolgender Adressierung bzw. Ansteuerung der genannten Reihen bzw. Zeilen (21) des ersten Gitters (20) während der Dauer einer alternativen Adressierung bzw. Ansteuerung der genannten Kammstrukturen (24, 25) des zweiten Gitters (23).
  3. Anzeige- bzw. Wiedergabe-Flachbildschirm nach Anspruch 2,
    dadurch gekennzeichnet, daß die Spalten (28) der Kathode (1) gleichzeitig mit jeder Reihe bzw. Zeile (21) des ersten Gitters (20) adressiert bzw. angesteuert werden, wobei ihr Potential eine Funktion der gewünschten Helligkeit für das Pixel ist, das durch ihren Schnittpunkt mit der Bahn (26, 27) des adressierten bzw. angesteuerten Kamms (24, 25) des zweiten Gitters (23) definiert ist, das sich über der laufenden Reihe bzw. Zeile (21) befindet.
  4. Anzeige- bzw. Wiedergabe-Flachbildschirm nach Anspruch 2 oder 3,
    dadurch gekennzeichnet, daß die Vorspann- bzw. Beaufschlagungspotentiale der genannten Kämme (24, 25) so gewählt sind, daß die Bahnen (26, 27) eines adressierten bzw. angesteuerten Kamms (24, 25) die Elektronen, welche von den Spalten (28) der Kathode (1) in Ausrichtung mit der Bahn (26, 27) des einer adressierten bzw. angesteuerten Reihe bzw. Zeile (21) zugeordneten Fokussierungskamms emittiert werden, in Richtung zur Anode (5) fokussieren und daß die Bahnen (27, 26) eines nicht adressierten bzw. angesteuerten Kamms (25, 24) die Elektronen sammeln, welche von den Spalten (28) der Kathode (1), die der Bahn (27, 26) des der adressierten bzw. angesteuerten Reihe bzw. Zeile (21) zugeordneten Kollektorkamms gegenüberstehen, emittiert werden.
  5. Anzeige- bzw. Wiedergabe-Flachbildschirm nach Anspruch 4,
    dadurch gekennzeichnet, daß das Potential eines Fokussierungskamms (24, 25) größer als das Potential der nicht adressierten bzw. angesteuerten Zeilen bzw. Reihen (21) des ersten Gitters (20) ist und daß das Potential eines Kollektorkamms (25, 24) kleiner als das Potential der nicht adressierten bzw. angesteuerten Reihen bzw. Zeilen (21) des ersten Gitters (20) ist.
  6. Anzeige- bzw. Wiedergabe-Flachbildschirm nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, daß der Gangabstand der Reihen bzw. Zeilen (21) des ersten Gitters (20) in Abhängigkeit von dem Mindestgangabstand bemessen ist, der zwischen den einzelnen Anschlußverbindungen dieser Reihen bzw. Zeilen (21) zu einer Steuerelektronik eingehalten werden muß, und daß die Zahl der Kammstrukturen (24, 25) des zweiten Gitters (23) in Abhängigkeit von der für den Bildschirm gewünschten Auflösung gewählt ist.
  7. Anzeige- bzw. Wiedergabe-Flachbildschirm nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, daß die genannten Gitter (20, 21) an einem Farbbildschirm angebracht sind, dessen Anode (5) mit drei Gruppen von jeweils einer Farbe entsprechenden alternierenden Leuchtstoffelementstreifen bzw. -bändern (7) versehen ist.
  8. Anzeige- bzw. Wiedergabe-Flachbildschirm nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, daß die genannten Gitter (20, 21) an einem monochromen Bildschirm angebracht sind, dessen Anode (5) aus Leuchtstoffelementen (7) eines einzigen Typs besteht.
EP96410030A 1995-03-22 1996-03-21 Doppel-Gate-Flaches Bildschirm Expired - Lifetime EP0734043B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9503570 1995-03-22
FR9503570A FR2732159B1 (fr) 1995-03-22 1995-03-22 Ecran plat de visualisation a double grille

Publications (2)

Publication Number Publication Date
EP0734043A1 EP0734043A1 (de) 1996-09-25
EP0734043B1 true EP0734043B1 (de) 2000-05-31

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EP96410030A Expired - Lifetime EP0734043B1 (de) 1995-03-22 1996-03-21 Doppel-Gate-Flaches Bildschirm

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US (1) US5764204A (de)
EP (1) EP0734043B1 (de)
JP (1) JPH08293273A (de)
DE (1) DE69608598T2 (de)
FR (1) FR2732159B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0160321B1 (ko) * 1994-04-28 1998-12-01 박현승 평면가스표시관
FR2748348B1 (fr) * 1996-05-06 1998-07-24 Pixtech Sa Ecran couleur a micropointes a double grille
GB2321335A (en) * 1997-01-16 1998-07-22 Ibm Display device
FR2758642B1 (fr) * 1997-01-20 1999-02-26 Gec Alsthom Transport Sa Systeme pour le controle de l'affichage d'une information
US6133893A (en) 1998-08-31 2000-10-17 Candescent Technologies, Inc. System and method for improving emitter life in flat panel field emission displays
RU2170471C1 (ru) * 1999-11-30 2001-07-10 Научно-исследовательский институт "Волга" Катодолюминесцентный экран
JP5044113B2 (ja) * 2005-10-04 2012-10-10 日本放送協会 冷陰極装置、電界放出型ディスプレイ、及び電界放出型ディスプレイの駆動方法
RU2378733C1 (ru) * 2008-04-16 2010-01-10 ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ УНИТАРНОЕ ПРЕДПРИЯТИЕ "Научно-исследовательский институт "ВОЛГА" (ФГУП "НИИ "ВОЛГА") Катодолюминесцентный экран матричного типа

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US3935500A (en) * 1974-12-09 1976-01-27 Texas Instruments Incorporated Flat CRT system
FR2568394B1 (fr) * 1984-07-27 1988-02-12 Commissariat Energie Atomique Dispositif de visualisation par cathodoluminescence excitee par emission de champ
US5557296A (en) * 1989-06-01 1996-09-17 U.S. Philips Corporation Flat-panel type picture display device with insulating electron-propagation ducts
US5012153A (en) * 1989-12-22 1991-04-30 Atkinson Gary M Split collector vacuum field effect transistor
US5625253A (en) * 1990-05-24 1997-04-29 U.S. Philips Corporation Flat-panel type picture display device
US5191217A (en) * 1991-11-25 1993-03-02 Motorola, Inc. Method and apparatus for field emission device electrostatic electron beam focussing
JPH0745218A (ja) * 1993-05-26 1995-02-14 Matsushita Electric Ind Co Ltd 平面型画像表示装置
KR0156032B1 (ko) * 1993-05-28 1998-10-15 호소야 레이지 전자방출소자 및 그 전자방출소자를 이용한 화상표시장치, 화상표시 장치의 구동장치, 화상표시장치의 화상표시 구동회로
TW272322B (de) * 1993-09-30 1996-03-11 Futaba Denshi Kogyo Kk
GB2285168B (en) * 1993-12-22 1997-07-16 Marconi Gec Ltd Electron field emission devices

Also Published As

Publication number Publication date
FR2732159A1 (fr) 1996-09-27
DE69608598T2 (de) 2001-02-08
DE69608598D1 (de) 2000-07-06
US5764204A (en) 1998-06-09
FR2732159B1 (fr) 1997-06-13
JPH08293273A (ja) 1996-11-05
EP0734043A1 (de) 1996-09-25

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