EP1139374A1 - Kathodenplatte für einen flachen Bildschirm - Google Patents

Kathodenplatte für einen flachen Bildschirm Download PDF

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Publication number
EP1139374A1
EP1139374A1 EP01410031A EP01410031A EP1139374A1 EP 1139374 A1 EP1139374 A1 EP 1139374A1 EP 01410031 A EP01410031 A EP 01410031A EP 01410031 A EP01410031 A EP 01410031A EP 1139374 A1 EP1139374 A1 EP 1139374A1
Authority
EP
European Patent Office
Prior art keywords
cathode
columns
additional
grid
lines
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Withdrawn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
EP01410031A
Other languages
English (en)
French (fr)
Inventor
Thierry Frayssinet
Bernard Bancal
Jean-Marc Dubois
Mathias Richter
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.)
Futaba Corp
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 EP1139374A1 publication Critical patent/EP1139374A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/021—Electron guns using a field emission, photo emission, or secondary emission electron source
    • H01J3/022—Electron guns using a field emission, photo emission, or secondary emission electron source with microengineered cathode, e.g. Spindt-type
    • 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
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H01J1/304—Field-emissive cathodes
    • H01J1/3042—Field-emissive cathodes microengineered, e.g. Spindt-type
    • 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

Definitions

  • the present invention relates to the field of screens display dishes, and more specifically so-called screens cathodoluminescence whose elements carry elements luminescent likely to be excited by bombardment electronic.
  • This electronic bombardment can come from microtips, layers with low extraction potential or a thermionic source.
  • microtip screens we below will only consider microtip screens but we note that the present invention generally relates to various types of screens mentioned above and the like.
  • a plate called cathode is provided with electronic emission microtips and is placed opposite a so-called anode plate provided with elements phosphors.
  • the cathode is associated with a grid provided with holes corresponding to the locations of the microtips. This device uses the electric field that is created between the cathode and the grid so that electrons are extracted from microtips. These electrons are then attracted to the elements anode phosphors if these are suitably polarized.
  • the present invention relates more particularly a cathode of a flat display screen associated with at least a so-called extraction grid, that is to say a cathode plate.
  • the microtips are generally deposited on cathode conductors organized in columns which constitute active electronic emission zones.
  • the columns are individually addressable.
  • the extraction grid is organized in rows perpendicular to the cathode columns, also individually addressable.
  • the anode is for example provided with alternating strips of elements phosphors each corresponding to a color (red, green, blue).
  • the bands are then generally parallel to the cathode columns and can be separated from each other others by an insulator.
  • the phosphor elements are deposited on electrodes made up of corresponding strips of a layer conductive, for example, of indium tin oxide (ITO) for a transparent anode.
  • ITO indium tin oxide
  • the anode In a monochrome screen, the anode carries a plane of phosphors of the same color or two sets phosphor elements of the same color which can be addressed separately, for example, organized in alternating bands like on a screen color.
  • the intersection of a cathode column and a grid row defines a screen pixel.
  • the sets of red, green, blue bands of the anode are often alternately polarized with respect to the cathode so that electrons extracted from the microtips of a pixel of the grid cathode are alternately directed towards the phosphor elements of each of the colors.
  • pixels can be set individually by elementary patterns of elements phosphors of each color on the anode side, these pellets being then addressable, for example, by groups of the same color.
  • the anode while being constituted of several sets of bands or elementary patterns of phosphors, is not switched by set of strips or patterns. All bands are then at the same potential. This is called an unswitched anode as opposed to so-called switched anodes where the colors are polarized sequentially.
  • the rows of the grid are sequentially polarized at a potential on the order of 80 volts, while strips or patterns of phosphor elements to be excited are biased under a voltage of several hundreds or even a few thousand volts, via of the ITO band on which the phosphor elements are filed.
  • the ITO bands carrying the other bands of phosphor elements are at a low or no potential.
  • the cathode columns are worn to respective potentials between an emission potential maximum and no emission potential (for example, 0 and around 40 volts respectively). We thus fix the brightness of a color component of each of the pixels of a line.
  • the choice of the values of the polarization potentials is linked to the characteristics of the phosphor elements and microtips. Conventionally, below a difference of potential of about 50 volts between the cathode and the grid, it there is no electronic broadcast, and the electronic broadcast maximum used corresponds to a potential difference of around 80 volts.
  • the cathode and the grid are generally formed by deposits in thin layers on a substrate, for example, glass, constituting the background of the screen.
  • the anode is usually formed on another glass substrate constituting, in this example, the screen surface.
  • the anode and the cathode-grid are produced independently of each other on the two substrates, then are assembled by means of a joint sealing device, sparingly, between the grid and the anode, an empty space to allow the circulation of electrons emitted from the cathode to the anode.
  • the internal space of the screen is therefore surrounded by the seal, usually made of glass, ensuring the sealing of the anode plates and cathode.
  • This joint must be placed away from the areas active anode and cathode, in particular, for allow the necessary interconnections of the elements.
  • a space is usually left between this active area of the anode and the cathode and the peripheral seal. This space is most often in an insulating material, for example, silicon oxide in reason for using technologies derived from those used in the manufacture of integrated circuits.
  • a problem that arises in conventional screens is the appearance of destructive phenomena due to the formation of arcs around the screen or its active area. These phenomena are due to the development of a load zone on the outskirts of the active zone in the insulating space separating it from the wall of sealing. This charging area also spreads to the surface of the sealing joint and thus approaches gradually from the other electrode.
  • This positive charge area is generated by electrons emitted to the anode during screen operation and which fall on the insulating zones at the edge of the zone active.
  • the development of this positive charge zone is finds it self-powered by the fact that the higher the positive area increases, the more it attracts new electrons. This area of charge ends up causing either arcs between the edge of the screen and cathode electrodes, an emission phenomenon parasite.
  • the present invention aims to overcome the drawbacks classic screens.
  • a feature of the present invention is provide, on the cathode-grid side, a peripheral protection zone between the active area, i.e. the surface participating in the display, and the peripheral sealing wall.
  • This area of peripheral protection consisting of at least one section conductive, has the role of preventing the propagation of electrons secondary to the sealing wall by trapping the electrons which fall on this or these sections.
  • the section (s) conductors occupy, in a peripheral layout of the area active, a sufficiently large perimeter to make negligible the secondary electrons likely to cross the barrier thus produced.
  • the conductive sections cover a distance greater than the distance that most electrons can travel that can be issued.
  • This distance depends on the energy of these secondary electrons which itself depends on the energy of the primary electrons and the inter-electrode space. For sizing and conditions of given operations, we know how to determine, statistically, energy distribution of secondary electrons, so the energy of the statistically majority secondary electrons.
  • the area of protection consists of at least one conductive ring made in a deposited layer, with interposition of a layer insulating, on the so-called extraction grid.
  • the peripheral conductive ring can be made in the formation layer of this grid additional, on the outskirts of the active area.
  • the area peripheral protection is carried out in at least one of the conductive levels among the level in which the cathode conductors and the level at which the extraction grid.
  • This preferred embodiment pursues several Goals.
  • a first objective is that the realization of the ring protection does not cause additional complexity in the fabrication of the grid cathode.
  • Another object of the present invention is to do not introduce any additional manufacturing steps in the process for producing a flat screen cathode plate.
  • Another objective is to solve own problems to the grid cathode plate.
  • the rows of the grid and the columns of the cathode are addressed individually. They require therefore conductive sections in large number on two edges of cathode plate which may be hindered (mechanically or functionally) by a peripheral conductive ring. As comparison, anode side, only three conductors emerge for a color screen since the strip sets are usually addressed simultaneously by color.
  • the present invention provides a type display flat screen cathode plate comprising a set of emission cathode conductors electronic, organized in columns, a set of conductors of electron extraction grid, organized in lines, and a peripheral protection zone, surrounding an active zone participating in the display, to prevent the spread secondary electrons outside the perimeter of the protection.
  • the peripheral protection zone consists of a ring conductor mainly surrounding the active area and made in an accessible driver level.
  • the cathode plate has, on both sides of the lines extraction, at least one additional conductive line accessible.
  • the cathode plate comprises, on either side of the columns electronic emission, at least one conductive column additional.
  • the grid lines and cathode columns are part of a stacking of thin layers with interposition of at least one isolation layer, the row or rows and / or columns being carried out in the respective levels of extraction lines and emission columns.
  • the additional column (s) are at least partially accessible.
  • the cathode emission columns extend below the or additional lines, grid extraction lines extending over the additional column (s).
  • the additional column (s) are adapted to be polarized to a corresponding potential, for the columns emission, if there is no electronic emission, the additional lines being adapted to be polarized to a potential corresponding, for the extraction lines, to a lack of addressing.
  • the number of additional columns and / or rows is function, in particular, of the width of the column conductors and of lines and the angle of the electronic emission cone of the cathode.
  • the present invention also provides a flat screen display comprising a cathode provided with regions active electronic emission, a cathodoluminescent anode provided with at least one active area of phosphor elements, and an electron extraction grid emitted by the active regions from the cathode towards the phosphor elements, the cathode and the grid being made on a cathode plate of the invention.
  • the number of additional columns and / or rows depends, among other things, the distance from the cathode plate to the cathodoluminescent anode.
  • the screen includes a polarization and addressing circuit for different conductors of the cathode, the grid and the anode, provided with links to polarize the rows and / or columns additional.
  • a feature of the present invention is, according to the preferred embodiment, to provide, on the cathode side, a conductive protective zone accessible (to electrons from internal space), formed of tracks according to the pattern of the columns of the cathode and / or the rows of the grid. So according to the invention, provision is made, on either side of the active area, for at least one additional cathode column and / or at least one additional grid row to fulfill the ring function protection.
  • cathode columns and grid rows is regular not only on the active area of the screen participating in the display, but also in the peripheral zone functionally forming a protective ring, so that the grid rows participating in the display extend over the protection cathode columns and / or that the cathode participating in the display extend under the rows of grid participating in the protection.
  • cathode columns and / or the grid rows located outside the active area are biased at a fixed potential or at the mass, regardless of the addressing of the columns and rows participating in the display.
  • this east polarization especially for conductive sections accessible, performed via a resistance high value to limit the high current which could appear in the event of an accidental flash, while allowing evacuation of charges.
  • Figures 1A, 1B, 1C and 1D show different sectional views of the second embodiment of a screen display according to the present invention. These figures are cuts taken along different lines of the screen, as it appears in Figure 2 which shows this embodiment in view On top.
  • the section lines of Figures 1A to 1D are illustrated in the representation of figure 2 by lines mixed bearing the reference letters of Figures 1 corresponding.
  • Figures 1A and 1B are sections along, respectively, a grid extraction line and a cathode emission column participating in the display.
  • Figures 1C and 1D are sections outside the active area, the along a grid line and a column, respectively cathode. The invention will be described later in relation with the assembly of FIGS. 1A to 1D and of FIG. 2.
  • a screen according to this mode of embodiment of the invention consists of a cathode 1 to microtips 2 ( Figures 1A and 1B) and a grid 3 provided with holes 4 (FIGS. 1A and 1B) corresponding to the locations of the microtips 2.
  • the cathode 1 is placed opposite an anode cathodoluminescent 5 of which a glass substrate 6 constitutes, by example, the screen area.
  • the microtips 2 are generally deposited on cathode conductors 7 organized in columns.
  • the microtips 2 are produced on a layer resistive (not shown) deposited on the conductors of cathode organized in meshes from a conductive layer, the microtips being arranged inside the meshes defined by the cathode conductors in columns.
  • Grid 3 consists of a conductive layer organized in rows 9 perpendicular to the columns of cathode conductors with interposition of an insulator 8 between the cathode and the grid.
  • the grid rows 3 are provided with a hole 4 plumb with each microtip 2 as well as the insulator 8 which is located plumb with the holes 4.
  • the intersection of a column 7 of the cathode 1 and a row 9 of grid 3 defines a pixel of the screen.
  • microtip 2 For reasons of clarity, a single microtip 2 has has been shown associated with each cathode conductor 7. On note however that microtips are generally among several thousand per screen pixel.
  • the grid cathode is produced on a substrate 10, for example glass, constituting in this example the background of the screen.
  • the substrate 6 of the anode 5 carries an electrode 11 consisting of a plane of a layer transparent conductor such as indium tin oxide (ITO).
  • Luminophores 12 of the same color are deposited on this electrode 11.
  • the anode can be provided with alternating strips or elementary patterns of phosphor elements, corresponding to different colors (red, green, blue) and polarized by set of bands or patterns, or by a conductive plane.
  • the invention does not intervene on the anode which is therefore perfectly classic.
  • An empty space 13 is provided between the anode and the cathode-grid during the assembly of substrates 6 and 10.
  • Des spacers (not shown) generally evenly distributed between grid 3 and anode 5 define the height of the space 13 and a peripheral seal 14 provides sealing of the assembly.
  • the screen has an active display area comprising m cathode columns 7 and n grid lines 9.
  • the active area dedicated to the display is symbolized by a rectangle 17 in the figure 2. This rectangle corresponds to the area in which the intersections of the m cathode columns and the n grid lines.
  • such a screen is controlled by means an electronic circuit 20 capable of being addressed individually the conductive columns 7 of the cathode 1 by links 21 (m connections), to address sequentially rows 9 of the grid 3 by individual links 22 (n links), and at bias the anode electrode 11 by means of a link 23.
  • the sets of red, green and blue stripes or patterns are alternately polarized with respect to the cathode by means of links appropriate.
  • the grid 3 comprises, on either side of the zone active 17 (above and below in the orientation of FIG. 2), at least one additional conducting line 16 not participating not on display.
  • the role of lines 16 is to constitute protective sections preventing the spread of uncontrolled charge to neighboring portions of the wall peripheral sealing 14. Lines 16 are discovered, that is, accessible by electrons from space internal screen in operation.
  • the other sides of the active area (right and left in the orientation of figure 2) are associated with protective conductive sections which, in the preferred embodiment illustrated by the figures, consist of extensions of the grid lines 9 which extend outside the active area 17. Although not shown, these extensions are preferably as wide as possible for minimize the accessible insulating layer portions and likely to allow the propagation of a load zone positive up to the sealing wall. As we will see by the continuation, the extensions of the grid lines 9 serve, of a side of the screen (on the left in Figure 2), also of portions electrical connection of these grid lines for their respective polarizations.
  • the same structure is reproduced in level of cathode 1 which then comprises, on either side of active area 17 (right and left in the orientation of the Figure 2), at least one additional conductive column 15 does not participating in the display.
  • Columns 15 can be discoveries between the extensions of grid lines 9 and 16 and then participate in the constitution of the protection zone peripheral. If, on the other hand, they are covered with the layer insulating 8, they do not have an electrical protective role but maintain the same pattern as in the active area, this which simplifies manufacturing by requiring no modification of the masks for forming the grid cathode.
  • the pattern of the cathode columns and the rows of the grid is preferably continued throughout cathode substrate 10, whether in active area 17 or out of it.
  • the only optional distinction between production outside the active area 17 and in the active area is that the additional 15 columns not participating in display may not have microtips as may the sections of columns 7 which extend outside the active area 17.
  • additional lines 16 of same as the sections of lines 9 which extend outside of the area 17 are preferably devoid of holes 4.
  • Columns 15 and lines 16 are addressable independently of columns 7 and rows 9.
  • two additional 15 columns are provided and other of the active zone 17 with regard to the cathode and two additional rows 16 for the wire rack.
  • the additional lines are, according to this invention, intended to be biased at a fixed potential for create, on both sides of the active area 17, lines to controlled potential and thereby prevent the spread of areas of load towards the sealing wall 14.
  • the extensions of lines 9 are subject to the same polarization as the lines of active area 17 and are therefore sequentially polarized at a positive potential with respect to the cathode, the resting potential being the mass.
  • the columns additional are also polarized at a fixed potential.
  • An advantage of the present invention is that the creation of the peripheral protection zone around the active area does not require any manufacturing process step additional to the production of a screen cathode classic.
  • the number of additional columns and / or rows is chosen, depending on the width of these rows and columns, to have a protective ring of overall width sufficient.
  • Using multiple rows or columns additional participating in the protection ring is therefore linked, according to the invention, to the fact that the reason for the plotting cathode columns and grid rows on all the substrate.
  • this same pattern is preferably reproduced for the columns and additional rows, always with the aim of simplifying the manufacturing process.
  • the columns are uncovered, i.e. accessible (which requires a modification of the deposit mask of the insulating layer 8), they then participate in the protection and we can consider that the peripheral zone is then closed, that is to say, there no longer remains, when viewed from above, portions of insulation in the protection zone.
  • An advantage of the present invention is that it respects the organization in columns and rows of the grid cathode. Consequently, its implementation does not harm the connection, on both sides of the cathode plate, of the columns and lines participating in the display.
  • FIG. 3 represents, by a schematic view in section, a detail of a screen according to the invention in the vicinity of the wall sealing device 14. This figure illustrates the choice of number of additional rows or columns depending on the screen specifications.
  • additional cathode columns 15 which are two with respect to columns 7 of this cathode participating in display. Note, however, that the same reasoning applies to additional rows 16 of the grid.
  • the number of columns or additional rows is chosen according to the cone emission of electrons by the cathode columns in periphery of the active area 17.
  • This cone is symbolized on the Figure 3 by dotted lines forming an angle ⁇ between them.
  • designating by d2 the distance between the outer edge of the last display column 7 of the outer edge of the last additional column 15, and designating by dl the distance between the projection, on cathode 1, of the greatest distance of the emission cone ⁇ and the outer edge of the last column 7 participating in the posting we must respect the condition of having a distance d2 greater than the distance d1. So the electrons which are likely to fall on the grid or the cathode in outside active area 17 are necessarily collected by the peripheral protection structure of the invention.
  • a transmission cone electronics in a conventional screen usually has a opening angle of about 30 °.
  • An advantage of the present invention in the mode of achievement which consists in preserving the manufacturing matrix of the grid cathode and to adapt the width of the protection by the number of columns and rows is particularly easy to put on in action.
  • the polarization of the columns additional 15 of the cathode participating in the protection takes place at a potential corresponding to an absence of emission. So, for a screen whose grid is polarized at a potential about 80 volts and whose cathode columns are polarized at levels between 0 and 40 volts depending on, for a monochrome screen, the gray level, we will polarize the additional 15 columns at a potential of 40 volts corresponding to a black level.
  • the lines additional 16 are preferably polarized (for via a current limiting resistor) to a fixed potential lower than the electron extraction potential microtips (in case the additional columns in be provided). For example, this potential will be less than 40 volts and preferably equal to the mass, that is to say potential of unaddressed grid lines.
  • additional columns 15 of the cathode can be discoveries, that is to say without insulation 8 covering them.
  • these additional columns as well as the additional lines 16 of the grid are preferably polarized by means of a current limiting resistance insofar as they are all used to collect electrons.
  • the insulator 8 is maintained in stacking so that columns 15 are not accessible directly by the electrons. In this embodiment, only additional lines 16 are possibly accessible and are therefore polarized through a Ballast resistance (not shown).
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • the above description makes reference to an embodiment using two rows and two additional columns on either side of the active area, other embodiments could be envisaged depending on protection distances desired.
  • the number of additional lines may be different from the number of additional rows depending, in particular, on the respective widths of these additional columns and rows.
  • the adaptation of the screen control circuit to the setting of the invention is within the reach of the skilled person to from the functional indications given above.
  • the invention preserves the normal addressing of a screen flat and only adds bonds for polarization additional columns and rows participating in the peripheral protection.
  • the invention applies whatever let the pattern given to the cathode columns and the lines of grid and the reference to columns and rows is purely arbitrary, the cathode conductors possibly being designated as rows and grid conductors as columns, depending on how the screen is addressed.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
EP01410031A 2000-03-28 2001-03-27 Kathodenplatte für einen flachen Bildschirm Withdrawn EP1139374A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0003916A FR2807205A1 (fr) 2000-03-28 2000-03-28 Plaque de cathode d'ecran plat de visualisation
FR0003916 2000-03-28

Publications (1)

Publication Number Publication Date
EP1139374A1 true EP1139374A1 (de) 2001-10-04

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EP01410031A Withdrawn EP1139374A1 (de) 2000-03-28 2001-03-27 Kathodenplatte für einen flachen Bildschirm

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US (1) US6798143B2 (de)
EP (1) EP1139374A1 (de)
JP (1) JP2001297724A (de)
FR (1) FR2807205A1 (de)

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US6989631B2 (en) * 2001-06-08 2006-01-24 Sony Corporation Carbon cathode of a field emission display with in-laid isolation barrier and support
US6756730B2 (en) * 2001-06-08 2004-06-29 Sony Corporation Field emission display utilizing a cathode frame-type gate and anode with alignment method
US7002290B2 (en) * 2001-06-08 2006-02-21 Sony Corporation Carbon cathode of a field emission display with integrated isolation barrier and support on substrate
US6682382B2 (en) * 2001-06-08 2004-01-27 Sony Corporation Method for making wires with a specific cross section for a field emission display
US6873118B2 (en) * 2002-04-16 2005-03-29 Sony Corporation Field emission cathode structure using perforated gate
US6747416B2 (en) * 2002-04-16 2004-06-08 Sony Corporation Field emission display with deflecting MEMS electrodes
US7012582B2 (en) * 2002-11-27 2006-03-14 Sony Corporation Spacer-less field emission display
US20040145299A1 (en) * 2003-01-24 2004-07-29 Sony Corporation Line patterned gate structure for a field emission display
US20040189552A1 (en) * 2003-03-31 2004-09-30 Sony Corporation Image display device incorporating driver circuits on active substrate to reduce interconnects
US7071629B2 (en) * 2003-03-31 2006-07-04 Sony Corporation Image display device incorporating driver circuits on active substrate and other methods to reduce interconnects
US20060113888A1 (en) * 2004-12-01 2006-06-01 Huai-Yuan Tseng Field emission display device with protection structure
KR101104074B1 (ko) * 2008-12-18 2012-01-12 한국전자통신연구원 색 가변형 전계 방출 장치
CN102148119B (zh) * 2010-11-27 2012-12-05 福州大学 发射单元双栅单阴式无介质三极fed装置及其驱动方法

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US20020047559A1 (en) 2002-04-25
FR2807205A1 (fr) 2001-10-05
JP2001297724A (ja) 2001-10-26
US6798143B2 (en) 2004-09-28

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