EP1032017A1 - Anode mit Widerstand für einen flachen Bildschirm - Google Patents

Anode mit Widerstand für einen flachen Bildschirm Download PDF

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Publication number
EP1032017A1
EP1032017A1 EP00410018A EP00410018A EP1032017A1 EP 1032017 A1 EP1032017 A1 EP 1032017A1 EP 00410018 A EP00410018 A EP 00410018A EP 00410018 A EP00410018 A EP 00410018A EP 1032017 A1 EP1032017 A1 EP 1032017A1
Authority
EP
European Patent Office
Prior art keywords
anode
layer
deposited
elements
resistive layer
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
EP00410018A
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English (en)
French (fr)
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EP1032017B1 (de
Inventor
Bernard Bancal
Pascal Olivier
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Pixtech SA
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Publication date
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP1032017A1 publication Critical patent/EP1032017A1/de
Application granted granted Critical
Publication of EP1032017B1 publication Critical patent/EP1032017B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/08—Electrodes intimately associated with a screen on or from which an image or pattern is formed, picked-up, converted or stored, e.g. backing-plates for storage tubes or collecting secondary electrons
    • H01J29/085—Anode plates, e.g. for screens of flat panel displays

Definitions

  • the present invention relates to a flat screen anode of visualization with phosphors excited by electrons, by example of the microtip type. It concerns more particularly the polarization of phosphor elements of an anode provided phosphor elements of different colors polarized by color, for example, of alternating bands of phosphor elements organized into combs.
  • FIG. 1 shows, very schematically, a screen display dish of the type to which the invention relates.
  • This screen includes two plates.
  • a first plate 1, commonly called cathode plate, is placed opposite a second plate 2 commonly called anode plate.
  • These two plates are spaced from each other by spacers 3 regularly spread across the screen area, and a vacuum is formed in the area delimited by the two plates and a gasket peripheral sealing 4.
  • Cathode plate 1 includes generation elements of electrons and pixel selection elements (not represented) which can be organized in various ways, for example example, as described in the US patent n ° 4940916 of the French Atomic Energy Commission in the case microtip screens.
  • the anode plate 2 is, in the case a color screen, with alternating strips of phosphor elements, each strip corresponding to a color (red, green, blue).
  • FIGS. 2A and 2B show, very schematically, a front view of a portion of an anode plate and a sectional view of this portion.
  • the anode includes, for example, alternating bands 4R, 4G, 4B phosphor elements respectively red, green and blue.
  • the bands of phosphor elements are arranged on corresponding conductive strips 5R, 5G, 5B generally organized in combs, all bands 5R being connected together as well as all 5G bands and all bands 5B.
  • the phosphor elements are divided into elementary patterns, each of which corresponds usually one pixel (in fact, a sub-pixel of each color for a tri-color screen). These "pixelated" phosphor elements can then always be addressed by polarization electrodes in conductive strips (5G, 5B and 5R) as described in relation to Figures 2A and 2B, but we use a special mask for depositing phosphor elements.
  • the light emitted by the elements phosphors spreads across the anode plate (down in Figure 2B).
  • the material of the conductive strips 5R, 5G, 5B, is then transparent, commonly made of indium tin oxide (ITO).
  • the transparent electrodes 5R, 5B, 5G are replaced by opaque electrodes, and preferably reflective, so that as much of it as possible the light emitted by the phosphor elements 4R, 4G, 4B or returned to the cathode once these phosphors have been excited by electronic bombardment.
  • 1 generator plate of electrons is then at least partially transparent and the observation is made through this cathode plate.
  • the sets of bands (for example, blue, red, green) are often alternately polarized positively with respect to cathode 1, so that the electrons extracts from emissive elements (for example, microtips) of a pixel of the cathode are alternately directed towards the phosphor elements 4R, 4G, 4B opposite each of the colors.
  • the selection command of the phosphor which must be bombarded by electrons requires selectively controlling the polarization of the phosphor elements of the anode, color by color.
  • bands 5R, 5G, 5B carrying elements phosphors to be excited are polarized under a voltage several hundred volts relative to the cathode, the other bands being at zero potential.
  • the choice of values for polarization potentials is related to the characteristics of the elements luminophores and emissive means.
  • the anode may, while being constituted of multiple sets of phosphor element bands or analogues, not to be switched by set of bands. All the bands are then polarized at the same potential, at least for the duration of a display frame. We then speak of anode not switched.
  • the potential difference between the anode and the cathode is essentially related to the inter-electrode distance, i.e. to the thickness of the internal space.
  • a resistive layer is provided in the case of microtip screens to receive these microtips and thus limit the formation of destructive short circuits between microtips and a control grid associated with the cathode.
  • arcs can occur, not only between the cathode plate and those of the elements anode phosphors that are polarized to attract electrons emitted by microtips, but also between two bands neighboring phosphor elements due to the difference in potential between these two bands.
  • the risk arcs exist only between anode and cathode.
  • interstitial strips 7 made of an insulating material (generally in silicon oxide).
  • the phosphor elements 4R, 4G, 4B exceed importantly the interstitial bands.
  • the thickness bands of phosphor elements is generally of the order about ten ⁇ m and the creation of isolation strips in silicon oxide of such thickness is, in practice, incompatible with the technologies used for manufacturing anodes, so that the thickness of the strips 7 is generally on the order of 1 to 2 ⁇ m, their width being on the order of 10 at 20 ⁇ m.
  • a first known solution to try to reduce the appearance of arcs between the anode and the cathode is to provide, at the end of each conductive strip 5R, 5G, 5B, a resistor between the supply line and the strip. As soon as a fort current appears in the band, this resistance drops the voltage. It follows that the potential difference between the conductive strip and the cathode decreases and causes the overvoltage generating the arc.
  • a disadvantage of such a solution is that it does not not protect against the formation of a lateral electric arc, i.e. between two neighboring bands 5R, 5G, 5B. It can indeed produce a local current flow between two bands which is therefore not avoided by the end resistances.
  • resistors are usually made of ruthenium whose resistivity is stabilized by annealing.
  • This high temperature annealing (of the order of 600 ° C) necessary to stabilize the resistance poses problems compatibility with the screen manufacturing process which requires, in the case where the conductive strips are in aluminum in the case of a transparent cathode, temperatures less than 600 °.
  • such a manufacturing process by annealing is difficult to control.
  • interleaved series resistors with the anode conductive strips are disadvantages that they constitute heating zones of the anode conducting tracks on the periphery of the screen.
  • the anode strips each have a width close to but less than 100 ⁇ m and the isolation strips 7 have a width of around ten ⁇ m.
  • the implementation of a local protection solution per layer resistive framed laterally by polarization bands not possible due to the small gap between the bands anode.
  • the present invention aims to overcome the drawbacks classical techniques by proposing a flat screen anode of visualization which eliminates the risk of occurrence of electric arc between the anode and the cathode plate, or between two strips neighboring phosphor elements of the anode, without harming the screen brightness.
  • the present invention also aims to provide a solution that is compatible with the classic differences between two bands of phosphor elements.
  • the present invention also aims to provide a solution that is particularly suitable for a cathode screen "transparent", that is to say of which the cathode plate constitutes the display area of the screen.
  • the invention further aims to propose a solution which respects the conventional anode manufacturing processes and, in in particular, the masks used during this manufacture.
  • the present invention provides a flat screen display anode, comprising elements phosphors intended to be excited by bombardment electronic, these elements being deposited on at least one electrode of constituted polarization, at least in line with the elements phosphors, of a stack comprising a resistive layer, itself deposited on a conductive polarization layer of the phosphor elements.
  • the phosphor elements are deposited directly on the layer resistive.
  • the phosphor elements are deposited on a reflective layer conductive, itself deposited on the resistive layer.
  • said reflective layer is deposited in elementary patterns of small dimension in the surface of the anode.
  • the phosphor elements are deposited according to the elementary pattern depositing the reflective layer.
  • the resistive layer is deposited in full plate.
  • the resistive layer has the same pattern as the reflective layer.
  • the resistive layer has, at least in the active area of the screen, the same pattern as the polarizing conductive layer.
  • said conductive layer has a pattern of interconnected alternating strips in at least two sets.
  • the present invention also provides a flat screen display comprising an electronic bombardment cathode of a cathodoluminescent anode.
  • FIG 3 shows a schematic sectional view a flat screen anode according to a first embodiment of the present invention.
  • This anode includes, as before, a support plate 2, for example, a glass plate. In the case of a screen observable from the anode, this plate is good heard transparent.
  • Anode conductive strips 5R, 5G, 5B are deposited, for example in a classic way as illustrated by Figures 2A and 2B, and are interconnected by set of bands assigned to the same color.
  • a feature of the present invention is that these bands 5R, 5G, 5B are all coated with bands of a material resistive 8.
  • strips of phosphor elements 4R, 4G, 4B are then deposited on the resistive strips 8 and no longer, as in conventional screens, directly on the strips 5.
  • the polarization electrodes of the elements phosphors here consist of a stack of one conductive layer (in which the 5R, 5G bands are defined and 5B) and a resistive layer 8.
  • the resistive layer 8 can, in the first mode of realization, be deposited, at least in the active part of the screen, i.e. outside the interconnection zones of the assemblies of strips, with the same pattern as the conductive strips 5R, 5G, 5B anode, therefore by means of the same mask.
  • Another important advantage of the present invention is that while effectively protecting the screen from arcs destructive electrics, the invention does not require any increase the lateral gap between the strips of phosphor elements.
  • the present invention is therefore particularly suitable for fine resolution anodes.
  • the anode bands 5R, 5G and 5B are preferably separated laterally by interstitial bands insulating 7.
  • the invention allows protection against destructive electric arcs not only between the plate anode and the cathode plate, but also between strips of neighboring phosphor elements polarized at potentials different.
  • This side protection is particularly effective insofar as it acts against any flow of current, even local.
  • the material now accessible is the material resistive layer 8, which prevents arcing destructive electrics.
  • the choice of the material of the resistive strips 8 depends on the application and, in particular, on the need for transparency (transparent anode) or reflective (transparent cathode) of these resistive bands.
  • oxide may be used of tin, or of thin silicon, deposited with a thickness included, preferably between one and two ⁇ m.
  • Conductive strips 5R, 5G, 5B anode are, for example, made of ITO (transparent) or aluminum (reflective) with thickness on the order of a tenth of ⁇ m.
  • the present invention provides an improvement notable compared to ruthenium series resistors which must have a thickness of several tens of ⁇ m.
  • the first embodiment of this invention also applies to the case of a monochrome screen in which the anode consists of a plane of phosphor elements of the same color or in the case of a screen (color or monochrome) in which the anode consists of several sets of bands not switched.
  • the resistive layer 8 is preferably deposited on the entire conductive anode layer.
  • the structure of the phosphor elements of the anode can be very different.
  • it could be elementary patterns, each of which will correspond to a pixel.
  • the present invention provides the additional advantage to be able to be implemented while a solution by side protection would take up too much space.
  • FIGS. 4A and 4B represent, respectively, a view from the front and in section, a second embodiment of an anode flat screen according to the invention. This embodiment is more particularly intended for an anode having to reflect light towards the cathode plate (1, figure 1) which then constitutes the screen area.
  • a feature of the second embodiment of the invention is that the polarization electrodes of the elements phosphors here consist of a stack of three layers.
  • an additional conductive layer 10 is deposited on the resistive layer.
  • a characteristic of this additional layer 10 is to be reflective to return the light to the cathode. So unlike the first embodiment which, if implemented in a transparent cathode screen, provides a reflective resistive layer, the second mode of embodiment allows the use of a resistive layer having any optical properties (transparent, absorbent or reflective), the optical reflection effect towards the cathode being here provided by the additional conductive layer 10.
  • the second embodiment of the invention applies more particularly to the case where the elements phosphors are deposited in elementary patterns using a specific mask comprising openings, for example, corresponding to the respective sizes of the screen pixels or sub-pixels of each screen color.
  • This characteristic is linked to the presence of the conductive layer 10 which must itself be filed according to these elementary grounds to avoid propagation of the charges along the strips of electrodes.
  • the elements 4'B, 4'R and 4'G phosphors are deposited in small areas of elementary patterns (in this example, rectangular).
  • the distribution of the colors of the phosphor elements always takes place in a band directly above the bands polarization conductors 5B, 5R and 5G which are produced in a pattern of alternating bands.
  • the layer additional reflective conductor is deposited by means of the same mask as the phosphor elements and is therefore constituted of elementary pattern areas 10 directly above the elements phosphors.
  • An insulating layer 7 is optionally provided between the anode strips. This layer 7 is deposited, as in the first embodiment, on the resistive layer 8 '. However, when provided, the insulating layer 7 is then present not only between the anode strips but also between the different elementary grounds for defining areas reflective layers 10 and phosphor elements 4.
  • the additional conductive layer is filed according to elementary patterns allows to keep a potential floating at the level of each pixel.
  • the resistive layer 8 ′ is deposited full plate, that is to say that it extends at least over the entire active area of the anode.
  • An advantage of the second embodiment of the invention is that it applies particularly well to a screen with transparent cathode. Indeed, by dissociating the functions of reflective layer and resistive layer, we have a greater choice of material to make these different layers. In particular, it will then be possible to provide a resistive layer 8 'in an optically absorbent material (for example, silicon). In this case, the resistive layer will then form a opaque mesh (black matrix) wherever there is no element phosphor or reflective layer 10. It will then absorb the light, which improves the contrast of the screen.
  • an optically absorbent material for example, silicon
  • the resistive layer if it is deposited full plate, and if it is made of a low coefficient material secondary emission (which is generally the case for materials resistive), will protect the underlying layer between the tracks conductive 5B, 5R and 5G which is generally carried out in a material with a high secondary emission factor, and will protect then the anode against charging effects which reduces the screen degassing.
  • an advantage linked to the removal of resistors at the end of the conductive strips on the one hand is that space is saved on the anode but also that we distribute the thermal effects linked to the presence of these resistances throughout the plate anode. This avoids localized overheating risking to be harmful.
  • FIGS. 5A and 5B represent, respectively, a view from the front and in section, an alternative embodiment of an anode according to the second embodiment of the invention.
  • the resistive layer 8 " is itself deposited according to the elementary patterns for depositing the phosphor elements 4 ′.
  • FIGS. 5A and 5B alignment between elementary patterns of elements phosphors 4 ', additional conductive layer 10 and the resistive layer 8 ".
  • these different elementary patterns are obtained by means of the same mask.
  • the invention remains perfectly compatible with the methods conventional anode manufacturing and, in particular, do not requires no additional mask whatever the mode of realization used.
  • the bands polarization conductors 5B, 5R and 5G have also been shown in strips as in the first embodiment.
  • the resistive layer provided in the second embodiment of the invention may also be deposited according to the pattern of bands 5B, 5R and 5G polarizing conductors. In this case, we keep the advantage not to use an additional mask for the deposit of this resistive layer as in the first embodiment.
  • FIG. 5B an 8 "resistive layer has been illustrated. relatively thicker than that illustrated in FIG. 4B. In effect, according to the invention and whatever the embodiment, you can adjust the resistance value accordingly, for a given material, the thickness of the resistive layer deposited.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • provision may be made that the polarizing conductive layer 5 and that the layer resistive 8 are deposited full plate.
  • the conductive layer reflective 10 and the phosphor elements will then deposited according to the elementary patterns of the screen pixels.
  • the choice of materials for the realization of an anode flat screen according to the invention is within the reach of ordinary skill profession based on the functional indications given above and applications. Note also that it will be able to to adapt the thicknesses of the different layers and in particular of the resistive layer depending on the characteristics discounted electrics.
  • the polarization layer 5 can be a conductive plane as well as the resistive layer can be full plate. There is then only one polarization electrode of the anode.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP00410018A 1999-02-26 2000-02-25 Anode mit Widerstand für einen flachen Bildschirm Expired - Lifetime EP1032017B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9902654 1999-02-26
FR9902654A FR2790329B1 (fr) 1999-02-26 1999-02-26 Anode resistive d'ecran plat de visualisation

Publications (2)

Publication Number Publication Date
EP1032017A1 true EP1032017A1 (de) 2000-08-30
EP1032017B1 EP1032017B1 (de) 2006-04-26

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EP00410018A Expired - Lifetime EP1032017B1 (de) 1999-02-26 2000-02-25 Anode mit Widerstand für einen flachen Bildschirm

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US (1) US6815885B1 (de)
EP (1) EP1032017B1 (de)
JP (1) JP2000251755A (de)
DE (1) DE60027494T2 (de)
FR (1) FR2790329B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133900A3 (de) * 2008-06-09 2009-12-30 Canon Kabushiki Kaisha Lichtemittierendes Substrat und Bildanzeigevorrichtung damit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002164007A (ja) * 2000-11-24 2002-06-07 Toshiba Corp 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
JP2010015870A (ja) * 2008-07-04 2010-01-21 Canon Inc 画像表示装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD133615A1 (de) * 1977-11-07 1979-01-10 Hoff Siegfried Von Anode fuer eine fluoreszenz-anzeigeroehre
JPS609039A (ja) * 1983-06-28 1985-01-18 Ise Electronics Corp 螢光表示管
JPS62126528A (ja) * 1985-11-26 1987-06-08 Ise Electronics Corp 螢光表示管
EP0684627A1 (de) * 1994-05-24 1995-11-29 Texas Instruments Incorporated Opakes elektrisch isolierendes Material enthaltende Anode zur Anwendung in einer Feldemissionsvorrichtung
EP0734042A1 (de) * 1995-03-22 1996-09-25 Pixtech S.A. Anode eines flachen Bildschirms mit Widerstandsstreifen
JPH10134740A (ja) * 1996-10-30 1998-05-22 Futaba Corp 電界放出型表示素子

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE133615C (de)
JPH0326617Y2 (de) * 1984-09-17 1991-06-10
FR2756969B1 (fr) * 1996-12-06 1999-01-08 Commissariat Energie Atomique Ecran d'affichage comprenant une source d'electrons a micropointes, observable a travers le support des micropointes, et procede de fabrication de cette source
JPH11185674A (ja) * 1997-12-24 1999-07-09 Futaba Corp 表示管用陽極基板とその製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD133615A1 (de) * 1977-11-07 1979-01-10 Hoff Siegfried Von Anode fuer eine fluoreszenz-anzeigeroehre
JPS609039A (ja) * 1983-06-28 1985-01-18 Ise Electronics Corp 螢光表示管
JPS62126528A (ja) * 1985-11-26 1987-06-08 Ise Electronics Corp 螢光表示管
EP0684627A1 (de) * 1994-05-24 1995-11-29 Texas Instruments Incorporated Opakes elektrisch isolierendes Material enthaltende Anode zur Anwendung in einer Feldemissionsvorrichtung
EP0734042A1 (de) * 1995-03-22 1996-09-25 Pixtech S.A. Anode eines flachen Bildschirms mit Widerstandsstreifen
FR2732160A1 (fr) * 1995-03-22 1996-09-27 Pixtech Sa Anode d'ecran plat de visualisation a bandes resistives
JPH10134740A (ja) * 1996-10-30 1998-05-22 Futaba Corp 電界放出型表示素子

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 118 (E - 316) 23 May 1985 (1985-05-23) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 346 (E - 556) 12 November 1987 (1987-11-12) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 10 31 August 1998 (1998-08-31) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133900A3 (de) * 2008-06-09 2009-12-30 Canon Kabushiki Kaisha Lichtemittierendes Substrat und Bildanzeigevorrichtung damit
US8072133B2 (en) 2008-06-09 2011-12-06 Canon Kabushiki Kaisha Light emitter substrate and image displaying apparatus using the same

Also Published As

Publication number Publication date
JP2000251755A (ja) 2000-09-14
US6815885B1 (en) 2004-11-09
EP1032017B1 (de) 2006-04-26
DE60027494T2 (de) 2007-04-19
DE60027494D1 (de) 2006-06-01
FR2790329A1 (fr) 2000-09-01
FR2790329B1 (fr) 2001-05-18

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