EP1096542A1 - Flasches Bildschirm mit Schutzgitter - Google Patents

Flasches Bildschirm mit Schutzgitter Download PDF

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Publication number
EP1096542A1
EP1096542A1 EP00410130A EP00410130A EP1096542A1 EP 1096542 A1 EP1096542 A1 EP 1096542A1 EP 00410130 A EP00410130 A EP 00410130A EP 00410130 A EP00410130 A EP 00410130A EP 1096542 A1 EP1096542 A1 EP 1096542A1
Authority
EP
European Patent Office
Prior art keywords
grid
potential
anode
cathode
screen
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.)
Withdrawn
Application number
EP00410130A
Other languages
English (en)
French (fr)
Inventor
Eric Compain
Hervé Sigal
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
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
Priority claimed from FR9913753A external-priority patent/FR2800511A1/fr
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP1096542A1 publication Critical patent/EP1096542A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/52—Screens for shielding; Guides for influencing the discharge; Masks interposed in the electron stream
    • 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
    • H01J29/467—Control electrodes for flat display tubes, e.g. of the type covered by group H01J31/123
    • 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
    • H01J29/84—Arrangements for removing or diverting unwanted particles, e.g. for negative ions or fringing electrons; Arrangements for velocity or mass selection
    • 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 flat display screens and, more particularly, so-called cathodoluminescence screens with anode carrying separate luminescent elements from each other by insulating zones and likely to be excited by electronic bombardment.
  • This electronic bombardment requires the luminescent elements to be polarized and can come from microtips or low potential layers extraction.
  • microtip screens we will not consider below as microtip screens but note that the The present invention relates, in general, to the various types of the aforementioned screens and the like.
  • Figure 1 shows an example of a classic structure a color microtip flat screen of the type to which relates the present invention.
  • Such a microtip screen essentially consists a cathode 1 with microtips 2 and an extraction grid 3 provided with holes 4 corresponding to the locations of the microtips.
  • Cathode 1 is placed opposite a cathodoluminescent anode 5 of which a glass substrate 6 constitutes, for example, the screen surface.
  • Cathode 1 is organized in a column and is made up, on a substrate 10, for example made of glass, of conductors cathode organized in meshes from a conductive layer.
  • the microtips 2 are generally made on a layer resistive 11 deposited on the cathode conductors and are arranged inside the meshes defined by the conductors cathode.
  • Figure 1 partially shows the interior of a mesh and the cathode conductors do not appear on this figure.
  • Cathode 1 is associated with grid 3 which is organized in lines. This grid 3 is deposited on the plate cathode with interposition of an insulating layer 12. The intersection a row of grid 3 and a column of cathode 1 defines a pixel.
  • This device uses the electric field created between the cathode 1 and grid 3 so that electrons are extracted microtips 2. These electrons are then attracted by phosphor elements 7 of anode 5 if these are suitably polarized.
  • the anode 5 is, for example, provided with strips alternating phosphor elements 7r, 7g, 7b corresponding to each colors (red, green, blue). The bands can be separated from each other by an insulator 8.
  • the phosphor elements 7 are deposited on electrodes 9, for example formed of corresponding strips of a conductive layer (transparent if the anode constitutes the surface of the screen) such than indium tin oxide (ITO).
  • ITO indium tin oxide
  • Tape sets red, green, blue are for example alternately polarized with respect to cathode 1, so that the electrons extracted from microtips 2 of a pixel of the grid cathode are alternately directed towards the phosphor elements 7 opposite each of the colors.
  • the anode 5 carries phosphor elements of the same color organized according to a single plane or according to two sets of alternating polarized bands, if applicable, separately.
  • the phosphor elements of the anode can be divided into elementary patterns corresponding to the pixel sizes of the screen.
  • the anode can also, while being made up of several sets of elementary bands or patterns of elements phosphors, not to be switched by sets of bands or motives. All the bands or patterns are then at the same potential, for example, by being carried by a conducting plane.
  • Strips or patterns of anodes carrying elements phosphors to be excited are polarized under a voltage several hundred volts relative to the cathode. In the case of a switched anode screen having several sets of bands, the other bands are at zero potential.
  • the choice of values polarization potentials is related to the characteristics of phosphor elements and emitting means on the cathode side.
  • ions are present in the inter-electrode space 13.
  • the constituent layers of the different electrodes as well as the residual gases are likely to generate ions under the effect of electronic bombardment. These positive ions are then attracted to the electrode with the lowest potential.
  • an addressing mode is provided, called regeneration, which consists in polarizing, periodically and outside the display periods, the cathode microtips in an emission state while the anode electrodes are polarized at low potential.
  • regeneration which consists in polarizing, periodically and outside the display periods, the cathode microtips in an emission state while the anode electrodes are polarized at low potential.
  • the present invention aims to overcome the drawbacks classic screens by proposing a new screen structure with protection against the undesirable effects of parasitic ions.
  • the invention aims, in particular, to protect the cathode against positive ions present in the inter-electrode space.
  • the cathode is indeed particularly sensitive to pollution chemical or physical. This is the case, in particular, for microtip screens.
  • the present invention also aims to provide a solution that is particularly simple to implement and which does not require modification either of the anode or of the cathode, nor the extraction grid of a conventional screen.
  • the present invention further aims to provide a solution that can be implemented without modifying the manufacturing conventional of a grid cathode and an anode of a screen microtips.
  • the invention aims to propose a solution that does not require any modification of the addressing conventional screen electrodes and, in particular, respective addressing potentials of the anode, cathode and the extraction grid.
  • the invention aims to protect the phosphor elements of the anode against ion bombardment while preserving the possibility of carrying out periods of classic regeneration.
  • the present invention provides a flat display screen comprising a cathode provided means of electronic field effect emission, an anode cathodoluminescent placed opposite the cathode, a grid extraction associated with the cathode, and at least one grid of filtering, permeable to electronic bombardment and polarized to prohibit stray ions produced on one side of this filter grid, to reach the cathode or the anode located the other side.
  • said filter grid is polarizable at a higher potential at a maximum polarization potential of the anode.
  • said filter grid is polarizable at a negative potential or zero.
  • the bias potential of said filter grid is switchable between said negative or zero potential, outside of periods display potential, and said potential greater than the maximum potential of polarization of the anode, during display periods.
  • said filter grid is placed closer to the cathode than of the anode.
  • the screen has a first filter grid polarized at a potential greater than the maximum polarization potential of the anode, and a second filter grid, closer to the anode as the first filter grid.
  • the second filter grid is biased at a lower potential at the maximum polarization potential of the anode and, preferably, lower than the minimum polarization potential of the cathode.
  • the bias potential of the first filter grid is switchable between a negative or zero potential outside of periods display potential and a potential greater than the maximum potential of polarization of the anode during display periods.
  • the or at least one of said filtering grids is integrated into the anode or at the cathode.
  • the present invention also provides a method of control of a screen which consists of, during regeneration periods interspersed between display periods, polarize the anode at a potential greater than the potentials of the grid and cathode, and polarize the additional grid to negative or zero potential.
  • a feature of the present invention is provide, between the extraction grid and the anode of a flat screen display, at least one additional filtering grid, polarized so as to modify the path of parasitic ions and to avoid parasitic ions appearing on one side of the grid additional filtering or one of the additional grids of filtering only spread across the other grid until the electrode (anode or cathode) delimiting the screen of this side.
  • the or additional filtering grids form a barrier to positive ions which would be likely to reach the cathode, in particular by being emitted by the anode.
  • the or additional filtering grids trap the ions present in the inter-electrode space at least during the periods regeneration between two display periods.
  • Figure 2 shows, partially and very schematic, a first embodiment of a flat screen of display according to the first aspect of the invention.
  • the different elements have been represented symbolically in chopped off.
  • a microtip flat screen of the invention comprises one or more anode electrodes 9 carrying phosphor elements 7, placed opposite electrodes of cathode 10 carrying microdots 2 of electronic emission. Still in a conventional manner, an extraction grid 3 provided with holes 4 at the microtip locations is associated with the cathode (designated by the global reference 1) and is deposited on an insulating layer 12. The inter-electrode space 13 is generally under vacuum.
  • At least one additional filter grid 20 is placed between the grid cathode 1 and the anode (designated by the global reference 5).
  • the role of the grid 20 is, first of all, to prevent the positive ions produced by the anode 5 from coming to bombard cathode 1.
  • the grid 20 is, according to a characteristic of this embodiment, polarized at a potential Vi higher than the highest potential Va of polarization of the anode 5.
  • the cations i located in space (difference da) between the grid 20 and the anode 5 are attracted by the anode which is at the lowest potential.
  • the potential for polarization Vi is at least 20 volts higher than the potential Va, this value of 20 volts being chosen to correspond to the amplitude of the potential barrier necessary so that the ions cannot pass through gate 20, the kinetic energy of cations at the time of their creation being typically a few electronvolts.
  • a single additional grid 20 is provided.
  • the grid 20 is then located closer to the cathode 1 than anode 5 in the inter-electrode space 13.
  • this grid 20 has a second effect which is to prevent positive ions from the ionization of residual gas molecules located in the inter-electrode space 13 to reach the cathode.
  • the grid 20 can be carried by the plate cathode.
  • Figure 3 shows, in a simplified sectional view similar to that of FIG. 2, a second embodiment preferred of the invention according to its first aspect.
  • two additional grids 40 and 40 ′ are provided in the inter-electrode space 13.
  • a first grid 40 closer to cathode 1 than the second grid 40 ′, has the role, like grid 20 of the first embodiment, to prevent the cations i present on the anode side 5 with respect to this grid 40 from reaching the cathode 1.
  • the grid 40 is, like the grid 20, polarized at a potential Vil greater than the maximum potential Va of the anode.
  • the role of the second grid 40 ', placed between the anode 5 and the first grid 40, is to cause a second inversion of the electric field in the space 13. This makes it possible, in particular, to obstruct the passage of negative ions c and secondary electrons are emitted by the anode following the electron bombardment. These negatively charged species would otherwise be attracted to the first grid 40. Once neutralized on the grid 40, these species could be ionized by electron bombardment of the grid 40, then giving rise to cations then being between the grid 40 and the cathode 1, therefore attracted by the latter.
  • the grid 40 ′ is, according to the invention, polarized at a potential Vi2 lower than the maximum potential Va of polarization anode 5 to repel negative species (anions and secondary electrons). This is consistent with the fact that electrons emitted by the cathode must remain attracted to the anode.
  • the potential Vi2 is less than the minimum potential Vc of cathode polarization. So the electrons emitted through the cathode are not likely to dislodge particles collected by the grid 40 '.
  • the cations i emitted by the anode are collected by the latter or by the grid 40 'at the lowest potential while being repelled by the grid 40, and therefore do not risk reaching the cathode.
  • An advantage of the second embodiment where performs a double direction reversal of the electric field between the anode and the grid cathode, compared to the first mode of realization where one carries out a simple reversal of direction of electric field, is that cathode 1 is now protected against both cations and anions produced by the anode.
  • the grid 40 is preferably placed as close as possible to the cathode to protect the cathode of the cations produced by the ionization of the gas residual contained in the inter-electrode space 13.
  • FIGS. 4A and 4B represent, by analogous views in the representations of FIGS. 2 and 3, a flat screen with microtips according to an embodiment of the second aspect of the invention.
  • the additional grid of filtering has the role of trapping the ions, in particular emitted by the extraction grid under the effect of electrons falling on this during the regeneration periods.
  • a microtip screen is, like the screen of FIGS. 2 and 3, constituted a cathode designated by the global reference 1 comprising cathode electrodes 10 associated with 2 emission microdots electronic.
  • An extraction grid 3 is placed on the cathode 1 with interposition of an insulator 12.
  • the grid 3 is provided with 4 holes at the microtip locations to allow the passage of electrons to an anode 5 formed by one or more electrodes 9 carrying phosphor elements 7.
  • a grid additional 30 is placed between cathode 1 and anode 5 in the inter-electrode space 13.
  • this grid 30 is preferably placed near the cathode like grid 20 of figure 2.
  • the gate 30 is intended to be addressed by a signal Vi at different potentials depending on whether the screen is in a display phase ( Figure 4A) or in a regeneration phase ( Figure 4B).
  • the second aspect of the invention applies more particularly to microtip screens which are controlled with a regeneration phase between periods (frames or display subframes).
  • FIG. 5 illustrates, in the form of chronograms, a example of the appearance of the addressing signals of the different elements of the screen of FIGS. 4A and 4B according to an embodiment of the present invention.
  • This figure represents the potentials addressing addresses Va from anode 5, Vc from cathode 1, Vg of a line of the extraction grid 3, and vi of the grid additional 30, respectively, during posting periods A, and during regeneration periods B.
  • the potential Vi of the grid 30 is chosen, during the display periods, greater than the maximum addressing potential Va of the anode 5, as in the first aspect of the invention .
  • the cations i present between the grid 30 and the anode 5 are picked up by the latter.
  • the electrons e emitted by the cathode, propagate normally in the space 13 until the anode 5.
  • effects similar to those exposed in relation to the first aspect are obtained insofar as the relations between the potentials are the same.
  • the hatching illustrates the fact that the potential Vc takes a value between 0 and 30 V depending on the luminance setpoint of the pixel considered.
  • Grid 30 is, for example, polarized at a potential of the order of 300 V during the periods display A.
  • the additional grid 30 is, according to this embodiment, brought to a potential Vi zero.
  • the cations i are collected either by this grid 30 or by the grid 3 after having made a U-turn.
  • the polarization of the grid 30 is compatible with the desired operation, that is to say that the electrons are not attracted to the anode 5.
  • the grid 30 makes electron bombardment screen which it repels towards the extraction grid 3 at a higher potential.
  • the cathode electrodes and according to their organization in columns and in lines, just as the anode electrodes can be addressed by color in the case of a color screen.
  • this does not fundamentally change the operation of the invention.
  • the potential has been illustrated. of addressing of the cathode columns Vc during the periods display A by any potential between 0 and 30 V while the corresponding lines of grid 3 are sequentially polarized at the potential of 70 v.
  • unaddressed grid lines have a potential of 0 V similarly that, in the case of a switched color anode, the electrodes anode of unaddressed colors.
  • An advantage of the second aspect of the invention is that it avoids the harmful effects of screen regeneration phases visualization dishes which are otherwise useful to avoid color drift on the anode side or breakdowns due to effects charging the insulating areas of the cathode.
  • a screen can operate with a double grid 40, 40 '.
  • the screen works in accordance with the second aspect described in relation to Figure 3, i.e. the grids protect the cathode from ions emitted by the anode and residual ionized gas between the grid 40 and the anode.
  • the anode is then protected from the cations emitted cathode side.
  • An advantage of the present invention is that it respects the classic structure a flat display screen for the anode, the cathode and the extraction grid.
  • the cathode which, in the case of a microtip screen, includes the most sensitive to ion bombardment, is protected against such bombing.
  • Another advantage of the present invention is that it is perfectly compatible with conventional screen addressing viewing dish.
  • the additional grid (s) 20, 30, 40 or 40 ' are preferably metallic and are designed to have high transparency so as not to interfere with the bombardment e from the cathode to the anode.
  • the grid 20 has openings which occupy 80% of its surface.
  • the transparency of a grid depends on the distribution of lines of potentials in its meshes.
  • the grid 40 ′ must be very transparent (the field lines inside the mesh must remain greater than the potential Vc), but its conductors are advantageously at a potential lower than the potential Vc so as not to be bombarded by electrons.
  • the additional filter grid (s) 20, 30 or 40 may be independent plates held between the cathode 1 and anode 5 by any suitable means, for example, by insulating spacers, preferably regularly distributed in the screen surface, depending on the mechanical strength intrinsic of the grid. We can however foresee any what other structure suited to the desired filtering function.
  • a grid can consist of stretched wires between the edges of the screen in one or two directions (not necessarily perpendicular), conductive pads or grids regularly distributed and resting on insulating pads carried by the anode or the cathode.
  • the grid (s) additional may not be metallic, but resistive or semiconductor.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • the choice of the distance separating the grid additional anode and cathode depends on the embodiment chosen and possible technical constraints of implementation of the screen. For example, in some cases, we may prefer do not affix a metal grid directly on the anode so as not to pollute the phosphor elements. We will be then leads to providing an intermediate structure of spacers to hang a self-supporting grid.
  • the additional grid (s) be integrated into the grid cathode and / or at the anode using the techniques of manufacturing derived from those of integrated electronic circuits.
  • FIG. 7 An example of an implementation of the invention using such manufacturing techniques is shown in figure 7.
  • the grid 40 is carried by the cathode while being deposited (deposit of a conductive layer) on the grid 3 with the interposition of a insulating layer 50 and is open, for example, depending on the pattern pixels.
  • the grid 40 ′ is carried by the anode and is produced, for example, by conductive pads (at least on the surface) polarizable 51, sandwiched between elementary anode patterns (9, 7).
  • the potentials Vil and Vi2 are fixed so that it exists equipotentials meeting the conditions set out above (in particular in relation to Figure 3).
  • the invention can be implemented work and find an interest, whether for monochrome screens or for color screens, adaptations if necessary addressing requirements according to the second aspect of the invention being within the reach of the skilled person from functional indications given above.
  • the invention can be implemented whatever the organization pixels and whatever the distribution of the electrodes anode to distribute the phosphor elements.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP00410130A 1999-10-28 2000-10-27 Flasches Bildschirm mit Schutzgitter Withdrawn EP1096542A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9913753 1999-10-28
FR9913753A FR2800511A1 (fr) 1999-10-28 1999-10-28 Ecran plat de visualisation a grille de protection
FR0004171A FR2800512B1 (fr) 1999-10-28 2000-03-31 Ecran plat de visualisation a grille de protection
FR0004171 2000-03-31

Publications (1)

Publication Number Publication Date
EP1096542A1 true EP1096542A1 (de) 2001-05-02

Family

ID=26212314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00410130A Withdrawn EP1096542A1 (de) 1999-10-28 2000-10-27 Flasches Bildschirm mit Schutzgitter

Country Status (4)

Country Link
US (1) US6683415B1 (de)
EP (1) EP1096542A1 (de)
JP (1) JP2001176432A (de)
FR (1) FR2800512B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003109524A (ja) * 2001-09-27 2003-04-11 Toshiba Corp 画像表示装置
KR101049822B1 (ko) * 2004-08-30 2011-07-15 삼성에스디아이 주식회사 전자 방출 소자
JP2006126260A (ja) 2004-10-26 2006-05-18 Canon Inc 画像表示装置
US20060113888A1 (en) * 2004-12-01 2006-06-01 Huai-Yuan Tseng Field emission display device with protection structure
US20080297740A1 (en) * 2007-05-29 2008-12-04 Phong Huynh Projection system and method of use thereof
EP3882949A4 (de) 2018-11-12 2022-11-16 Peking University Miniaturröntgenquelle auf einem chip und herstellungsverfahren dafür

Citations (6)

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Publication number Priority date Publication date Assignee Title
US2431113A (en) * 1946-07-23 1947-11-18 Rauland Corp Ion filter
FR1329194A (fr) * 1962-07-17 1963-06-07 Ass Elect Ind Dispositif à décharge électronique
US4012656A (en) * 1974-12-09 1977-03-15 Norman Ralph L X-ray tube
EP0660358A1 (de) * 1993-12-27 1995-06-28 Canon Kabushiki Kaisha Elektronenquelle und Elektronenstrahlgerät
EP0660368A1 (de) * 1993-12-22 1995-06-28 Gec-Marconi Limited Feldemissionselektronenvorrichtung
FR2764731A1 (fr) * 1997-06-13 1998-12-18 Commissariat Energie Atomique Tube a rayons x comportant une source d'electrons a micropointes et des moyens de focalisations magnetique

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US5554828A (en) * 1995-01-03 1996-09-10 Texas Instruments Inc. Integration of pen-based capability into a field emission device system
US5949395A (en) * 1995-12-21 1999-09-07 Telegen Corporation Flat-panel matrix-type light emissive display
US6081246A (en) * 1996-11-12 2000-06-27 Micron Technology, Inc. Method and apparatus for adjustment of FED image
FR2761523B1 (fr) * 1997-03-28 1999-06-04 Pixtech Sa Pose d'espaceurs dans un ecran plat de visualisation
FR2762927A1 (fr) * 1997-04-30 1998-11-06 Pixtech Sa Anode d'ecran plat de visualisation
FR2770338B1 (fr) * 1997-10-24 2000-01-14 Pixtech Sa Elimination de l'effet de moire d'un ecran plat de visualisation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431113A (en) * 1946-07-23 1947-11-18 Rauland Corp Ion filter
FR1329194A (fr) * 1962-07-17 1963-06-07 Ass Elect Ind Dispositif à décharge électronique
US4012656A (en) * 1974-12-09 1977-03-15 Norman Ralph L X-ray tube
EP0660368A1 (de) * 1993-12-22 1995-06-28 Gec-Marconi Limited Feldemissionselektronenvorrichtung
EP0660358A1 (de) * 1993-12-27 1995-06-28 Canon Kabushiki Kaisha Elektronenquelle und Elektronenstrahlgerät
FR2764731A1 (fr) * 1997-06-13 1998-12-18 Commissariat Energie Atomique Tube a rayons x comportant une source d'electrons a micropointes et des moyens de focalisations magnetique

Also Published As

Publication number Publication date
FR2800512B1 (fr) 2002-03-01
US6683415B1 (en) 2004-01-27
JP2001176432A (ja) 2001-06-29
FR2800512A1 (fr) 2001-05-04

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