EP0704877B1 - Protection électrique d'une anode d'écran plat de visualisation - Google Patents

Protection électrique d'une anode d'écran plat de visualisation Download PDF

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Publication number
EP0704877B1
EP0704877B1 EP95410112A EP95410112A EP0704877B1 EP 0704877 B1 EP0704877 B1 EP 0704877B1 EP 95410112 A EP95410112 A EP 95410112A EP 95410112 A EP95410112 A EP 95410112A EP 0704877 B1 EP0704877 B1 EP 0704877B1
Authority
EP
European Patent Office
Prior art keywords
anode
interconnection
strips
track
conductive
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
EP95410112A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0704877A1 (fr
Inventor
Jean-François Peyre
Francis Courreges
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
Original Assignee
Pixtech 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.)
Filing date
Publication date
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP0704877A1 publication Critical patent/EP0704877A1/fr
Application granted granted Critical
Publication of EP0704877B1 publication Critical patent/EP0704877B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/04—Electrodes; Screens
    • H01J17/12—Control electrodes
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • 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
    • 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
    • H01J29/96—One or more circuit elements structurally associated with the tube
    • 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

Definitions

  • the present invention relates to a flat screen anode visualization, of the type comprising at least two sets of alternating bands of phosphor elements deposited on corresponding conductive strips and at least two interconnection conductors, respectively, of the strips of each set. It applies more particularly to the making luminescent elements of an anode a color screen, such as a microtip color screen.
  • Figure 1 shows the structure of a flat screen microtips of the type to which the invention relates.
  • Such a microtip screen essentially consists a cathode 1 with microtips 2 and a grid 3 provided with holes 4 corresponding to the locations of the microtips 2.
  • Cathode 1 is placed opposite a cathodoluminescent anode 5 of which a glass substrate 6 constitutes the screen area.
  • Cathode 1 is organized in columns and is made up, on a glass substrate 10, cathode conductors 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 to 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 lines. The intersection of a line from the 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 anode 5.
  • anode 5 is provided of alternating bands of phosphor elements 7r, 7b, 7g each corresponding to a color (Blue, Red, Green). The strips are separated from each other by an insulator 8.
  • the phosphor elements 7 are deposited on electrodes 9, consisting of corresponding strips of a conductive layer transparent such as indium tin oxide (ITO).
  • the sets of blue, red, green bands are alternately polarized with respect to cathode 1, so that the electrons extracted from microtips 2 of a pixel of the cathode / grid are alternately directed towards the elements phosphors 7 opposite each of the colors.
  • the phosphor 7 selection command (the phosphor 7g in figure 1) which must be bombarded by electrons from microdots 2 of cathode 1 requires ordering, selectively the polarization of the phosphor elements 7 of anode 5, color by color.
  • FIG. 2 schematically illustrates a structure classic color screen anode. This figure represents partially, in elevation on the phosphor side, an anode 5 produced according to known techniques. Strips 9 of electrodes anode, deposited on the substrate 6, are interconnected outside of the useful surface of the screen, by color of phosphor elements 7 to be connected to a control system (not represented). Two interconnection tracks 12 and 13, respectively anode electrodes 9g and 9b, are made for two of the three colors of phosphor elements (for example 7g and 7b). An insulation layer 14 (shown in phantom in Figure 2) is deposited on the interconnection track 13. A third interconnection track 15 is connected, via conductors 16 deposited on the insulation layer 14, to the 9r anode electrode strips for the elements phosphor 7r of the third color.
  • the rows of grid 3 are sequentially polarized at a potential of the order of 80 V while that the bands of phosphor elements (for example 7g in figure 1) to be excited are biased under a voltage of the order of 400V, the other bands (for example 7r and 7b in Figure 1) being at zero potential.
  • the cathode columns 1, whose potential represents for each row of the grid 5 the brightness of the pixel defined by the intersection of the column of cathode and grid row 5 in color considered, are brought to respective potentials understood between a maximum emission potential and a potential no emission (for example 0 and 30 V respectively).
  • the potential difference between the anode and the cathode is related to the inter-electrode distance.
  • screen brightness which means that we are looking for a the greatest possible distance between electrodes.
  • the structure of the inter-electrode space which has spacers likely to create gray areas in the screen if they are too large, prevents to increase this inter-electrode distance.
  • Inter-electrode space of a conventional screen is therefore of the order of 0.2 mm. This leads to choosing an anode-cathode voltage value which is critical from the point of view of arc formation electric.
  • Destructive electric arcs can then occur at the slightest dimensional irregularity of the distance from a microtip or grid layer and the phosphor elements of the anode. Such irregularities are also inevitable given the small dimensions and techniques used to make the anode and of the grid cathode.
  • the resistive layer 11 makes it possible to limit the formation of destructive short circuits between microtips and the grid.
  • arcs can occur between the grid 3 and those of the phosphor elements 7 of the anode which are polarized to attract the electrons emitted by microtips 2 (for example the 7g phosphors in figure 1). Arcs can also occur between two bands neighbors of phosphor elements (for example 7g and 7r in figure 1) due to the potential difference between these two bands.
  • the invention aims to overcome these drawbacks by proposing a microtip display flat screen anode which eliminates the risk of arcing between the anode and the grid or between two neighboring strips of elements phosphors of the anode, without affecting the brightness of the screen.
  • the present invention provides a flat display anode of the type comprising at least two sets of alternating bands of phosphor elements deposited on corresponding conductive strips and at at least two interconnection conductors, respectively, of the strips of each set.
  • the conductive strips of said assembly are interconnected by resistors placed in series between the conductive strips and said interconnection conductor to which they are associated.
  • each conductive strip is individually connected to the interconnection conductor via a resistance.
  • the same resistance is associated with several bands conductive of the whole.
  • the resistances are produced by layer screen printing thick resistive sections on a deposited insulation layer at least on a track constituting the interconnection conductor, the insulation layer being locally open to plumb with the ends of each resistive section for allows electrical connection of these ends, respectively at one end of at least one conductive strip and at the interconnection track.
  • the insulation layer extends over the entire surface of the anode and is open, in the useful surface of the screen, to the balance of each conductive strip.
  • all resistive sections associated with the interconnection track are the same length.
  • the anode has three sets of alternating bands phosphor elements each corresponding to a color and at least three interconnection conductors of the bands of a same colour.
  • all resistive sections associated with the same track interconnections are the same length and extend from a end of a conductive strip to the interconnection track with which this band is associated.
  • all interconnection tracks are dropped from a same side of the anode being parallel to each other and perpendicular to the conductive strips.
  • At least two perpendicular interconnection tracks to the conductive strips surround these conductive strips.
  • An essential characteristic of the present invention is to propose the realization of the interconnections of strips of anode conductors polarizing the phosphor elements, by means of resistors placed in series between the conductive strips and the interconnection track at which they are associated with.
  • the present invention provides for polarizing each band of phosphor elements, or a small group of bands phosphor elements of the same color, through a resistor placed in series between this strip, or this small group, and the interconnection track with which it is associated.
  • the resistance value is preferably chosen so as not to cause a decrease in blood pressure anode of more than a few percent so as not to generate change in screen brightness that is noticeable for the user and also in order not to cause a notable stray power dissipation.
  • These layers may, for example, be made of doped silicon, amorphous or polycrystalline, or nickel-chrome.
  • the invention proposes to electrically isolate all the conductive strips of the anode not only between them but also interconnection tracks, then to affix a resistive layer between each conductive strip, or group of a few bands, and the interconnecting track.
  • an anode according to a first embodiment of the invention consists of parallel conductive strips 9r, 9g, 9b deposited on a substrate 6 and intended to receive in the useful surface of the screen of the phosphor elements (not shown).
  • these bands must be capable of being sequentially polarized by sets of bands of the same color (red, green, blue).
  • Each band 9r, 9b, 9g is individually connected to an interconnection track 21r, 21g, 21b respectively of bands of the same color, through a section resistive 22.
  • the resistive sections (for example 22r) associated to an interconnection track (for example 21r) are electrically isolated from the other two interconnection tracks (by example 21g, 21b).
  • an insulation layer 23 is interposed at least on the two interconnection tracks 21g and 21b which are closest to the ends of the conductive strips 9.
  • the insulation layer 23 covers the entire anode and is partially open plumb with both ends of each section resistive 22 to allow the electrical connection of these ends, respectively at one end of a conductive strip 9 and to an interconnection track 21.
  • the layer isolation 23 covers the entire anode, it is also conventionally open, in the useful surface of the screen plumb of each conductive strip 9 to receive the phosphor elements. In other words, the isolation layer 23 is in this case combined with the isolation layer 8 (FIG. 1) of the phosphor elements between them.
  • Openings 24r, 24g, 24b and 25r, 25g, 25b are practiced in the isolation layer 23 directly above the ends resistive sections 22r, 22g, 22b, respectively in look of an interconnection track 21r, 21g, 21b and the end of a conductive strip 9r, 9g, 9b.
  • each track interconnection 21 and a strip 9 of phosphor elements takes place via a series resistor by a resistive section 22.
  • the resistive sections 22 are dimensioned for all have the same resistance value between their ends, at least for all the sections associated with the same interconnection track, therefore with the same color.
  • all the resistive sections associated with the same track have the same length and the same section which set the value of the series resistance between a strip conductor and the interconnection track to which it is associated.
  • all the resistive sections 22 of the screen has the same section and the same length.
  • figure 5 represents the electric diagram equivalent of the embodiment shown in FIG. 3.
  • Each conductive strip 9 is individually protected against electric arcs by a series resistor Ra of high value between this strip and the interconnection track 21 with which it is associated.
  • the resistance Ra is chosen by a value such that it limits the current in the conductive strip 9 at a given value chosen to avoid the appearance of destructive electric arcs, without cause a significant drop in the anode voltage.
  • the microdots of cathode 1 in the form of a microtip 2 per pixel then that they are in reality several thousand per screen pixels. It thus appears a resistance Rk which corresponds to the resistive layer 11 between the cathode conductors and microtips.
  • This resistance Rk makes it possible to homogenize electronic emission of microtips 2 and avoid the appearance short circuits between grid 3 and the microtips 2.
  • the resistance Ra provided by a given resistive section is electrically found in series with this globalized resistance Rk at the pixel level.
  • the resistance value Rk globalized at the level of a pixel is of the order of 2 M ⁇ and is found in series with the value of the resistance Ra which is same order of magnitude (about 0.7 M ⁇ ).
  • a resistance of the order of 670 k ⁇ limits the fall of voltage across the resistor about 2%.
  • Such a resistance value prevents arcing destructive electrics by limiting the current in the band conductive at 0.7 mA, while rendering the decrease in imperceptible screen brightness.
  • Ra resistances with a value of around 670 k ⁇ can be made using thick film technology with an ink having a resistivity of 50 k ⁇ / square, by means of resistive sections 22 with a width of approximately 75 ⁇ m, about 10 ⁇ m thick and 1 mm long.
  • FIG. 6 illustrates a variant of the embodiment shown in Figure 3.
  • the tracks are not all placed on the same side of the anode.
  • two tracks for example 21r and 21g
  • the third track for example 21b
  • a such an alternative embodiment makes it possible to require less precision for screen printing of resistive sections 22 in layers thick.
  • FIGS 7 and 8 illustrate another embodiment of the present invention which also makes it possible to facilitate the realization of resistive sections according to technology thick layers.
  • the conductive strips 9 of the anode are no longer individually connected to a track interconnection, but by group of a small number of bands of the same color.
  • the conductive strips of the same color are linked three by three to a track interconnection, via a resistive section 22.
  • the conductive strips 9r are connected in groups of three consecutive bands, by their ends lying on the side of runway 21r, by means of runways 26r parallel to interconnection tracks.
  • the conductive strips 9g are linked in groups of three consecutive bands, by their ends located on the side of runway 21g, also at by means of 26g tracks parallel to the interconnection tracks.
  • the conductive strips 9b of the third color they are connected three by three, but directly by means of resistive sections 22b.
  • an insulation layer 23 is preferably deposited over the entire surface of the anode. This layer is open, in line with the bands 9 in the useful area of the screen for receiving phosphor elements, and off of the useful surface of the screen to make the interconnections through the resistive sections 22. Des openings 25r, 25g and 25b are made in the layer insulation 23 plumb with one of the ends of the sections resistors 22r, 22g and 22b, respectively opposite the tracks interconnection 21r, 21g and 21b. 24r and 24g openings are plumb with the other end of the sections resistors 22r and 22g, respectively on the tracks 26r and 26g. Openings 24b are made directly above the end of each conductive strip 9b which is located side of interconnection track 21b.
  • each strip 9b of the third color has at its end located on the side of track 21b, a pad 27 plumb with which a opening 24b. This is to allow easy connection of bands 9b, three by three, via the same section resistive 22b, to interconnection track 21b.
  • each group of three bands of the same color is connected individually via a Ra resistor, to an interconnection track bands of the same color.
  • the choice of embodiment depends for example on the width of the anode conductive strips, therefore the size screen pixels. Indeed, the more we reduce the size of pixels, the narrower the conductive strips 9, the more the precision of the screen printing of the resistive sections in layers thick will be critical.
  • each of the constituents described for the constituent layers of the anode may be replaced by one or more constituents completing the same function.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP95410112A 1994-09-28 1995-09-25 Protection électrique d'une anode d'écran plat de visualisation Expired - Lifetime EP0704877B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411806 1994-09-28
FR9411806A FR2725072A1 (fr) 1994-09-28 1994-09-28 Protection electrique d'une anode d'ecran plat de visualisation

Publications (2)

Publication Number Publication Date
EP0704877A1 EP0704877A1 (fr) 1996-04-03
EP0704877B1 true EP0704877B1 (fr) 1999-01-07

Family

ID=9467520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95410112A Expired - Lifetime EP0704877B1 (fr) 1994-09-28 1995-09-25 Protection électrique d'une anode d'écran plat de visualisation

Country Status (7)

Country Link
US (1) US5592056A (zh)
EP (1) EP0704877B1 (zh)
JP (1) JPH08236047A (zh)
KR (1) KR960012156A (zh)
CN (1) CN1129848A (zh)
DE (1) DE69507101T2 (zh)
FR (1) FR2725072A1 (zh)

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Publication number Priority date Publication date Assignee Title
FR2723254B1 (fr) * 1994-07-26 1996-10-11 Pixel Int Sa Anode d'ecran plat de visualisation
FR2732160B1 (fr) * 1995-03-22 1997-06-13 Pixtech Sa Anode d'ecran plat de visualisation a bandes resistives
US5952987A (en) * 1996-01-18 1999-09-14 Micron Technology, Inc. Method and apparatus for improved gray scale control in field emission displays
JP3199682B2 (ja) 1997-03-21 2001-08-20 キヤノン株式会社 電子放出装置及びそれを用いた画像形成装置
US6013986A (en) * 1997-06-30 2000-01-11 Candescent Technologies Corporation Electron-emitting device having multi-layer resistor
US6323831B1 (en) * 1997-09-17 2001-11-27 Kabushiki Kaisha Toshiba Electron emitting device and switching circuit using the same
FR2769114B1 (fr) * 1997-09-30 1999-12-17 Pixtech Sa Simplification de l'adressage d'un ecran a micropointes
US6144144A (en) * 1997-10-31 2000-11-07 Candescent Technologies Corporation Patterned resistor suitable for electron-emitting device
JP2000311642A (ja) 1999-02-22 2000-11-07 Canon Inc 画像形成装置
US6771236B1 (en) * 1999-03-05 2004-08-03 Sony Corporation Display panel and display device to which the display panel is applied
FR2797092B1 (fr) * 1999-07-27 2001-09-14 Commissariat Energie Atomique Procede de fabrication d'une anode d'un ecran plat de visualisation
JP2003178690A (ja) * 2001-12-10 2003-06-27 Matsushita Electric Ind Co Ltd 電界放出素子
KR101018344B1 (ko) * 2004-01-08 2011-03-04 삼성에스디아이 주식회사 전계방출형 백라이트 유니트 및 그 구동 방법과 하부패널의 제조 방법
KR101009977B1 (ko) * 2004-01-29 2011-01-21 삼성에스디아이 주식회사 전계 방출 표시 소자
JP4115403B2 (ja) 2004-02-18 2008-07-09 キヤノン株式会社 発光体基板及び画像表示装置
JP2005294158A (ja) * 2004-04-02 2005-10-20 Toshiba Corp 画像表示装置
JP2006120622A (ja) * 2004-09-21 2006-05-11 Canon Inc 発光スクリーン構造及び画像形成装置
JP2006185614A (ja) * 2004-12-24 2006-07-13 Toshiba Corp 表示装置
JP4551755B2 (ja) * 2004-12-24 2010-09-29 キヤノン株式会社 画像表示装置
JP4750413B2 (ja) * 2004-12-27 2011-08-17 キヤノン株式会社 画像表示装置
WO2007005014A1 (en) * 2005-06-30 2007-01-11 Thomson Licensing Segmented conductive coating for a luminescent display device
US7834535B2 (en) * 2006-12-25 2010-11-16 Canon Kabushiki Kaisha Flat panel type display apparatus
JP2008159449A (ja) * 2006-12-25 2008-07-10 Canon Inc 表示装置
US8018133B2 (en) * 2006-12-25 2011-09-13 Canon Kabushiki Kaisha Image display apparatus
JP2009295532A (ja) * 2008-06-09 2009-12-17 Canon Inc 発光体基板及びそれを用いた画像表示装置

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FR2623013A1 (fr) * 1987-11-06 1989-05-12 Commissariat Energie Atomique Source d'electrons a cathodes emissives a micropointes et dispositif de visualisation par cathodoluminescence excitee par emission de champ,utilisant cette source
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Also Published As

Publication number Publication date
FR2725072A1 (fr) 1996-03-29
JPH08236047A (ja) 1996-09-13
DE69507101T2 (de) 1999-06-24
US5592056A (en) 1997-01-07
EP0704877A1 (fr) 1996-04-03
FR2725072B1 (zh) 1997-02-07
DE69507101D1 (de) 1999-02-18
CN1129848A (zh) 1996-08-28
KR960012156A (ko) 1996-04-20

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