EP0732723B1 - Flaches Bildschirm mit hohem Inter-Elektrodenabstand - Google Patents

Flaches Bildschirm mit hohem Inter-Elektrodenabstand Download PDF

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Publication number
EP0732723B1
EP0732723B1 EP96410023A EP96410023A EP0732723B1 EP 0732723 B1 EP0732723 B1 EP 0732723B1 EP 96410023 A EP96410023 A EP 96410023A EP 96410023 A EP96410023 A EP 96410023A EP 0732723 B1 EP0732723 B1 EP 0732723B1
Authority
EP
European Patent Office
Prior art keywords
screen
substrate
plate
flat display
display 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.)
Expired - Lifetime
Application number
EP96410023A
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English (en)
French (fr)
Other versions
EP0732723A1 (de
Inventor
Jean-Marc Sol
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
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Pixtech SA
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Filing date
Publication date
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP0732723A1 publication Critical patent/EP0732723A1/de
Application granted granted Critical
Publication of EP0732723B1 publication Critical patent/EP0732723B1/de
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
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/241—Manufacture or joining of vessels, leading-in conductors or bases the vessel being for a flat panel display
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/127—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using large area or array sources, i.e. essentially a source for each pixel group

Definitions

  • the present invention relates to the production of a flat display screen with inter-electrode distance important.
  • This is, for example, a fluorescent screen in which an electronic program is obtained by electron extraction from microtips or thin film, by example a carbon-diamond film.
  • the invention applies more particularly to a flat screen of the type comprising a microtip cathode of electron bombardment of an anode carrying elements phosphors.
  • This type of screen is commonly called a screen fluorescent to microtips.
  • Figure 1 shows the functional structure a flat screen with microtips.
  • Such a microtip screen essentially consists a cathode 1 with microtips 2 and a grid 3 provided of holes 4 corresponding to the locations of the microtips 2.
  • Cathode 1 is placed opposite a cathode-luminescent anode 5 of which a glass substrate 6 constitutes the surface screen.
  • Cathode 1 is organized in columns and is made up, on a substrate 10, for example made of glass, of conductors cathodes organized in mesh from a conductive layer.
  • the microtips 2 are made on a resistive layer 11 deposited on the cathode conductors and are arranged inside the meshes defined by the conductors of cathode.
  • Figure 1 partially showing the interior of a mesh, the cathode conductors do not appear on this figure.
  • Cathode 1 is associated with grid 3 which is it organized in lines, an insulating layer (not shown) being interposed between the cathode conductors and the grid 3. The intersection of a row in 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 with strips alternating phosphor elements 7, each corresponding to a color (Blue, Red, Green). The bands are separated from each other by an insulator 8.
  • the phosphor elements 7 are deposited on electrodes 9, made up of corresponding bands a transparent conductive layer such as indium tin oxide (ITO). Tape sets blue, red, green are alternately polarized with respect at cathode 1, so that the electrons extracted from the microtips 2 of a pixel of the cathode / grid are alternately directed towards the phosphor elements 7 opposite each of the colors.
  • ITO indium tin oxide
  • the assembly of the two substrates 6 and 10, supporting respectively anode 5 and cathode 1, is carried out with provision of an internal space 12 for the circulation of electrons emitted by cathode 1.
  • Figure 2 illustrates, in a cross-sectional view an assembled screen, an example of conventional means used to define the inter-electrode space 12.
  • the inter-electrode space 12 is conventionally defined by means of spacers regularly distributed over the entire surface of the screen between the grid 3 and the anode 5. These spacers are, for example, made of glass balls 13.
  • the substrates 6 and 10 carrying the anode 5 and the cathode / grid respectively are assembled to one another by means of a peripheral seal, for example by means of a bead of fusible glass 14.
  • the use of spacers is related to the pressure difference between the interior and the exterior of the screen which tends to cause deformation of the substrates 6 and 10 due to their small thickness (of the order of a millimeter) relative to the surface of the screen (several hundred cm 2 ).
  • a disadvantage of using distributed spacers 13 in the useful area of the screen is that they constitute obstacles to the path of electrons emitted by microtips 2. These obstacles cause gray areas on the screen in the extent that the phosphors 7 with which they are in gaze can only receive electrons. Even if the spherical shape limits this effect by reducing the area of contact between a ball 13 and a phosphor element 7, this is only true for small diameter balls.
  • the anode-cathode voltage is directly related to the brightness of the screen. So the more we seeks to reduce the gray areas due to the spacers reducing their diameter, the more the anode-cathode voltage must be reduced, and the more the screen brightness is reduced.
  • the diameter of the balls is limited to about 200 ⁇ m to avoid creating shadow areas
  • the voltage anode-cathode is then limited to about 500 to 1000 volts.
  • the present invention aims to overcome these drawbacks by offering a flat display screen which presents a large inter-electrode distance allowing it to operate under high anode-cathode voltage, while being devoid of gray areas and for which, the definition of the inter-electrode space does not cause pollution of the internal surface of substrates.
  • Another object of the present invention is to provide a flat display screen in which the pumping tube no longer constitutes an area weakening the screen.
  • the present invention provides a flat display screen of the type comprising two electrodes separated by an internal space, at least a first electrode being carried by a thin substrate and by a thick stiffening plate, said internal space being defined by a peripheral frame interposed between said electrodes, outside their useful area.
  • a second electrode is carried by a thick plate stiffening constituting a thick substrate on one side internal of which this electrode is formed.
  • said second electrode is carried by a thin substrate and by a thick stiffening plate.
  • said plate associated with the first electrode is intended to form the bottom of the screen and has an orifice passage of a pumping tube which is associated with said substrate carrying the first electrode and which is intended to make the empty in internal space.
  • the assembly of a plate to the substrate to which it is associated is made by gluing this plate on one side external of the substrate, after formation of all the constituent elements of the electrode carried by this substrate on one side internal.
  • said first electrode consists of a cathode with electron bombardment microtips of an anode provided phosphor elements.
  • a stiffening plate which is intended to constitute the screen surface is transparent and grooved, from its internal face, according to a mesh pattern corresponding to the distribution of the screen pixels, these grooves being filled of an opaque material.
  • a metallic layer is deposited on the external face of the substrate associated with a stiffening plate which is intended to constitute the surface of the screen, by defining a pattern of meshes corresponding to the distribution of the pixels of the screen.
  • a stiffening plate which is intended to constitute the screen surface is assembled to the substrate to which it is associated by electrostatic bonding of a trellis metallic with a mesh corresponding to the distribution screen pixels and interposed between this plate and said substrate with which it is associated.
  • the thickness of a stiffening plate is included between 4 mm and 5 cm, the thickness of said frame being included between 0.5 and 5 mm.
  • the present invention plans to use rigid and thick plates, respectively 20 and 21, reported on the external faces of the screen to stiffen the structure. So the distance between electrodes 12 can be defined by a simple peripheral frame rigid 22 without the need for spacers internal to avoid deformation of the substrates 6 and 10 carrying, respectively, the anode and the cathode / grid.
  • the assembly substrates 6 and 10 is, for example, made at by means of two fusible glass cords (not shown) interposed between each face of the frame 22 and the substrate 6 or 10 with which this face is associated with.
  • the thickness of the plates 20 and 21 depends on the screen area.
  • the thickness of the plates 20 and 21 is, for example, with a given value between 4 mm and 5 cm and the thickness of the rigid frame 22 is, for example, of a value data between 0.5 and 5 mm.
  • stiffening 20 and 21 does not harm training cathode / grid and anode on the substrates, respectively 6 and 10.
  • this training uses deposition techniques in thin layers, the implementation of which generally requires the use of thin substrates, in particular due to inertia thermal of the glass of which they are generally made up. Employment thick substrates would slow the speeds of temperature rise and fall which are already very slow, for example, for chemical vapor deposition (CVD) of the resistive layer 11 generally made of silicon.
  • CVD chemical vapor deposition
  • the invention thus makes it possible to use thicknesses of conventional substrates between, for example, between 0.5 and 1.5 mm.
  • the constraints of substrate thicknesses are particularly critics regarding the formation of the cathode / grid. Indeed, the substrate 10 carrying the cathode receives a significant number of layers whose formation requires high temperatures. So the thermal inertia of thick substrate would lead to manufacturing times too long due to the multiple ascents and descents in temperature.
  • the formation of anode 5 on the substrate 6 requires fewer deposits.
  • the grounds (conductor strips) are likely to be made by screen printing.
  • the substrate 6 has directly the thickness final necessary for the rigidity of the desired screen, the plate 20 then being merged with the substrate 6.
  • the plate 21 associated with this substrate has an orifice 23 allowing the passage of this tube 15.
  • this advantage is that the pumping tube 15 no longer constitutes, once the screen is finished, a projection perpendicular to the plane of the screen. Indeed, this projection of tube 15 which generally has, when closed, a length about 6 mm is, as shown in Figure 3, absorbed by the thickness of the plate 21. Thus, this projection fits into the overall size of the screen when finished and no longer constitutes a zone of weakness.
  • the choice of the constituent materials of the plates 20 and 21 depends, in particular, on the overall dimensions and weight we want to give to the screen and constraints assembly of each plate 20 or 21 with the substrate 6 or 10 with which it is associated.
  • the plate which constitutes the surface of the screen (generally the plate 20 associated with the substrate 6 carrying the anode 5) is however necessarily transparent for allow viewing.
  • the plate (for example 21) constituting the background of the screen can, however, be opaque.
  • a transparent plate is, for example, glass and thus has the same coefficient of thermal expansion as the glass substrate with which it is associated.
  • the thickness of plates 20 and 21 glass is about 4 mm for a rectangular screen 10 cm diagonal and about 2 cm for a 30 cm screen diagonal.
  • a transparent plate can also be produced made of a transparent organic material.
  • a transparent organic material are, for example, polycarbonate or plexiglass.
  • An advantage of using a organic material is that it is lighter than glass.
  • a transparent plate can also be formed of a laminated glass.
  • a laminated glass This is, for example, a sheet of polyvinyl butyral, polyurethane or silicone "sandwich" between two sheets of glass.
  • An opaque plate associated with the bottom of the screen can, for example, be ceramic, metal or some material opaque plastic. We can also confer, to a plate opaque, a honeycomb or mesh structure to make it lighter for equal resistance.
  • the substrate, bottom side of the screen (for example the substrate 10 carrying the cathode), can also be opaque by being, for example, ceramic.
  • the melting temperature of this layer of fusible glass 24 is chosen to be slightly higher than the temperature of melting of the fusible glass cords (not shown) used later for the assembly of substrates 6 and 10 with interposition of the frame 22.
  • the substrates 6 and 10 are assembled together under a controlled atmosphere, for example nitrogen, and are sealed at high temperature. Then, plates 20 and 21 are attached and cold bonded to substrates 6 and 10. The internal space 12 is then emptied by pumping by means of the tube 15 which is then closed at its end free.
  • a controlled atmosphere for example nitrogen
  • the invention makes it possible to obtain a screen devoid of from any gray area.
  • the invention makes it possible to increase the anode-cathode voltage and thus the brightness of the screen.
  • the plate 20 constituting the screen surface can now be treated by thermal quenching to be made more resistant and / or be tinted. This is not possible for screens conventional since thermal quenching techniques glass requires glass with a thickness of at least about 3 mm.
  • the plate 20 can be used for build or support a touch screen device.
  • Another advantage of the present invention is that it makes it possible, on the side of the plate constituting the screen surface (for example the plate 20 associated with the anode), a transparent matrix separated by an opaque mesh which corresponds to the distribution of the pixels.
  • An advantage of such a matrix is that it draws the pixels of the screen, on the side of its surface. This improves the quality of the display and, in particular, the outlines of the different subjects of a image by avoiding, with the glance, the perception of a fade between two neighboring pixels.
  • the opaque mesh reduces the stray reflections of the incident light on the screen, enhancing thus the contrast of the image.
  • Figure 4 illustrates, in a perspective view exploded view, a second embodiment of the present invention in which the plate (for example 20) contributes to the formation of such a matrix.
  • the assembly of the plate 20 to substrate 6 is carried out by means of a wire mesh opaque 25 whose mesh 26 corresponds to the distribution pixels on the screen.
  • a wire mesh opaque 25 whose mesh 26 corresponds to the distribution pixels on the screen.
  • the wire mesh 25 can also be replaced by a layer of opaque adhesive deposited according to the pattern of 26 mesh desired.
  • the trellis is consisting of a metallic deposit formed on the external face of the substrate 6 which is then bonded to the plate 20, as indicated in connection with the first embodiment.
  • the matrix is made in the thickness of the plate 20.
  • the plate 20 is ribbed, preferably from its face internal, according to the desired opaque mesh pattern.
  • the ribs are then filled with an opaque material, for example a epoxy resin.
  • the plate 20 is finally assembled to the substrate 6, as indicated in relation to the first embodiment, and the desired matrixing is obtained.
  • a microtip screen the invention also applies to a fluorescent screen of the type comprising a film, for example of carbon-diamond, of emission electronic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Claims (10)

  1. Flacher Anzeigebildschirm mit zwei Elektroden (1, 5), die durch einen inneren Raum (12) getrennt sind, dadurch gekennzeichnet, daß mindestens eine erste Elektrode (1) von einem dünnen Substrat (10) und von einer dicken Versteifungsplatte (21) getragen wird, wobei der innere Raum (12) durch einen Umfangsrahmen (22) definiert ist, der außerhalb ihrer Nutzfläche zwischen die Elektroden (1, 5) eingefügt ist.
  2. Flacher Anzeigebildschirm nach Anspruch 1, dadurch gekennzeichnet, daß eine zweite Elektrode (5) von einer dicken Versteifungsplatte getragen wird, die ein dickes Substrat auf einer Innenfläche bildet, aus dem diese Elektrode (5) hergestellt ist.
  3. Flacher Anzeigebildschirm nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Elektrode (5) von einem dünnen Substrat (6) und von einer dicken Versteifungsplatte (20) getragen wird.
  4. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Platte (21), die der ersten Elektrode (1) zugeordnet ist, die Grundfläche des Bildschirms bildet und eine Öffnung (23) zum Durchführen einer Pumpröhre (15) aufweist, die mit dem Substrat (10) zugeordnet ist, welches die erste Elektrode (1) trägt, und die zur Vakuumerzeugung im inneren Raum (12) vorgesehen ist.
  5. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Zusammenbau einer Platte (20, 21) mit dem Substrat (10, 6), der sie zugeordnet ist, durch Bonden dieser Platte (20, 21) an eine Außenfläche des Substrats (6, 10) durchgeführt wird, nachdem alle Elemente, welche die Elektrode (5, 1) bilden, die von dem Substrat (6, 10) auf einer Innenfläche getragen wird, hergestellt sind.
  6. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die erste Elektrode durch eine Kathode (1) aus Mikrospitzen (2) durch das Beschießen einer Anode (5), die mit phosphorisierenden Elementen (7) versehen ist, mit Elektronen gebildet ist.
  7. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Versteifungsplatte (20), die die Oberfläche des Bildschirms bilden soll, transparent und gerillt ist, wobei die Rillen auf ihrer Innenfläche gemäß einem Maschenmuster (26), das der Verteilung der Bildpunkte des Bildschirms entspricht, ausgebildet und mit einem undurchsichtigen Material gefüllt sind.
  8. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Metallschicht auf der externen Oberfläche des Substrats (6) aufgebracht ist, die einer Versteifungsplatte (20) zugeordnet ist, die die Oberfläche des Bildschirms bilden soll, und ein Maschenmuster (26) definiert, das der Verteilung der Bildpunkte des Bildschirms entspricht.
  9. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Versteifungsplatte (20), die die Oberfläche des Bildschirms bilden soll, auf dem Substrat (6) angebracht ist, mit dem sie durch elektrostatisches Bonden mit einem metallischen Gitter (25) verbunden ist, das ein Maschennetz (26) darstellt, das der Verteilung der Bildpunkte des Bildschirms entspricht und das zwischen dieser Platte (20) und dem Substrat (6), dem sie zugeordnet ist, angeordnet ist.
  10. Flacher Anzeigebildschirm nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Dicke der Versteifungsplatte (20, 21) zwischen 4 mm und 5 cm liegt, und die Dicke des Rahmens (22) zwischen 0,5 und 5 mm liegt.
EP96410023A 1995-03-17 1996-03-12 Flaches Bildschirm mit hohem Inter-Elektrodenabstand Expired - Lifetime EP0732723B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9503376A FR2731840B1 (fr) 1995-03-17 1995-03-17 Ecran plat de visualisation a distance inter-electrodes elevee
FR9503376 1995-03-17

Publications (2)

Publication Number Publication Date
EP0732723A1 EP0732723A1 (de) 1996-09-18
EP0732723B1 true EP0732723B1 (de) 2000-02-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96410023A Expired - Lifetime EP0732723B1 (de) 1995-03-17 1996-03-12 Flaches Bildschirm mit hohem Inter-Elektrodenabstand

Country Status (5)

Country Link
US (1) US5798609A (de)
EP (1) EP0732723B1 (de)
JP (1) JPH08298086A (de)
DE (1) DE69606446T2 (de)
FR (1) FR2731840B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0782169A1 (de) * 1995-12-29 1997-07-02 STMicroelectronics, Inc. Feldemissionsanzeigevorrichtung
US5813893A (en) * 1995-12-29 1998-09-29 Sgs-Thomson Microelectronics, Inc. Field emission display fabrication method
US5964630A (en) * 1996-12-23 1999-10-12 Candescent Technologies Corporation Method of increasing resistance of flat-panel device to bending, and associated getter-containing flat-panel device
JP6400803B2 (ja) * 2016-10-28 2018-10-03 サムソン エレクトロ−メカニックス カンパニーリミテッド． コイル部品

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935500A (en) * 1974-12-09 1976-01-27 Texas Instruments Incorporated Flat CRT system
US4857799A (en) * 1986-07-30 1989-08-15 Sri International Matrix-addressed flat panel display
US5015912A (en) * 1986-07-30 1991-05-14 Sri International Matrix-addressed flat panel display
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
DE69116209T2 (de) * 1990-04-28 1996-08-29 Sony Corp Flache Anzeigevorrichtung
IL95736A (en) * 1990-09-19 1994-06-24 Yeda Res & Dev Flat panel display devices
JP2616617B2 (ja) * 1991-10-03 1997-06-04 双葉電子工業株式会社 平形蛍光表示装置
JPH06310043A (ja) * 1992-08-25 1994-11-04 Sharp Corp 電子放出デバイス
US5491376A (en) * 1994-06-03 1996-02-13 Texas Instruments Incorporated Flat panel display anode plate having isolation grooves
US5453659A (en) * 1994-06-10 1995-09-26 Texas Instruments Incorporated Anode plate for flat panel display having integrated getter

Also Published As

Publication number Publication date
JPH08298086A (ja) 1996-11-12
DE69606446T2 (de) 2000-09-14
US5798609A (en) 1998-08-25
FR2731840B1 (fr) 1997-06-06
EP0732723A1 (de) 1996-09-18
DE69606446D1 (de) 2000-03-09
FR2731840A1 (fr) 1996-09-20

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