EP0867912A1 - Montieren von Abstandshältern in einer flachen Anzeigetafel - Google Patents

Montieren von Abstandshältern in einer flachen Anzeigetafel Download PDF

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Publication number
EP0867912A1
EP0867912A1 EP98410032A EP98410032A EP0867912A1 EP 0867912 A1 EP0867912 A1 EP 0867912A1 EP 98410032 A EP98410032 A EP 98410032A EP 98410032 A EP98410032 A EP 98410032A EP 0867912 A1 EP0867912 A1 EP 0867912A1
Authority
EP
European Patent Office
Prior art keywords
studs
screen
plate
cathode
conductors
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Withdrawn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
EP98410032A
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English (en)
French (fr)
Inventor
Richard Pepi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pixtech SA
Original Assignee
Pixtech SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pixtech SA filed Critical Pixtech SA
Publication of EP0867912A1 publication Critical patent/EP0867912A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01J29/028—Mounting or supporting arrangements for flat panel cathode ray tubes, e.g. spacers particularly relating to electrodes
    • 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
    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/18—Assembling together the component parts of electrode systems
    • H01J9/185—Assembling together the component parts of electrode systems of flat panel display devices, e.g. by using spacers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2329/00—Electron emission display panels, e.g. field emission display panels
    • H01J2329/86—Vessels
    • H01J2329/8625—Spacing members

Definitions

  • the present invention relates to flat screens of visualization.
  • the invention applies, more particularly, to so-called cathodoluminescence screens, the anode of which carries luminescent elements, separated from each other by zones insulating, and likely to be excited by electronic bombardment.
  • This electronic bombardment can come from microtips, layers with low extraction potential or a thermionic source.
  • the present invention relates, more particularly, the definition of an internal space, generally under vacuum, of circulation of electrons emitted by the screen cathode.
  • Figure 1 shows the structure of a flat screen microtip color, essentially consisting of a cathode 1 with microtips 2 and a grid 3 provided with corresponding holes 4 at the microtip locations 2.
  • the cathode 1 is placed opposite a cathodoluminescent anode 5 including a substrate of glass 6 constitutes the screen surface.
  • Cathode 1 is organized in columns and is made up, on a glass substrate 10, cathode conductors organized in mesh from a conductive layer.
  • the microtips 2 are made on a resistive layer 11 deposited on the cathode conductors and are arranged inside meshes defined by the cathode conductors.
  • Figure 1 partially represents the interior of a mesh and the conductors cathode do not appear in this figure.
  • Cathode 1 is associated with grid 3 organized in lines. The intersection a row of grid 3 and a column of cathode 1 defines a pixel.
  • This device uses the electric field which is created between the cathode 1 and the grid 3 so that electrons are extracted from the microtips 2. These electrons are then attracted by phosphor elements 7 from the anode 5 if these are suitably polarized.
  • the anode 5 is provided with alternating bands of phosphor elements 7r, 7g, 7b each corresponding to a color (Red, Green, Blue). The strips are parallel to the columns of the cathode and are separated from each other by an insulator 8, generally silicon oxide (SiO 2 ).
  • the phosphor elements 7 are deposited on electrodes 9, made up of corresponding strips of a transparent conductive layer such as indium tin oxide (ITO).
  • ITO indium tin oxide
  • the assembly of the two substrates, or plates 6 and 10 supporting respectively the anode 5 and the cathode 1 is carried out by creating an empty space 12 for the circulation of emitted electrons by cathode 1.
  • the distance between cathode 1 and anode 5 must be constant for the screen brightness to be regular over its entire surface.
  • Spacers generally made up beads, usually made of glass, with a corresponding diameter at the desired inter-electrode distance, are regularly distributed on one of the plates, before assembly of the plates between they.
  • the inter-electrode distance defined by the diameter balls, is conventionally of the order of 200 ⁇ m while the space between two cathode conductors corresponding to different columns is of a given value between approximately 10 and 100 ⁇ m and that the pixel pitch is of a given value between about 50 and 300 ⁇ m.
  • a problem which then arises is to maintain the balls in position until the screen is assembled. Indeed, if balls are, during assembly, in areas active on the screen, they constitute obstacles to the path of electrons emitted from micropoints 2 to phosphors 7 ce which creates gray areas. To solve this problem, the marbles are generally glued to the cathode before assembly.
  • Document FR-A-2727242 describes an example of a technique to stick beads on the cathode.
  • This technique consists of use an application plate, the size of the screen, provided with circular notches for receiving balls to be glued. The bottom of the notches is drilled to communicate with a room suction. We start by sucking loose balls in a suitable container. Then, while maintaining the suction, the balls are brought into contact with a plate coated with glue, in order to deposit a point of glue on each ball. We then apply the grid-cathode plate to the application plate. Finally, cut off the suction and then move the plate aside cathode-grid of the application plate. The balls remain then glued to the grid-cathode plate at the locations defined by the notches on the application plate.
  • Another known bonding technique consists in using, not a pierced application plate, but a needle hollow, to take, glue and position the balls. This technique is described in US-A-5558732.
  • a disadvantage of these techniques is that the glue causes pollution of the surface of the grid cathode and requires a vacuum degassing heat treatment.
  • Another disadvantage of these techniques is that they require positioning the balls on the cathode plate while the cathode receives the electron emission microdots which are particularly sensitive to degassing. Indeed, it is not possible to glue the balls on the anode because the phosphor elements deposited, on the anode side, would be damaged by the degassing heat treatment.
  • the present invention aims to overcome the drawbacks known techniques for positioning balls.
  • the invention aims, in particular, to propose a solution which does not require a heat treatment step after affixing of the balls on one of the plates of the screen.
  • the invention also aims to propose a solution which allows to affix the balls on the anode side.
  • the invention further aims to allow the use conventional ball positioning tools.
  • the present invention provides a flat display screen made up of two plates parallels defining an inter-electrode space, at least one screen plate with studs outside of active areas of a thickness clearly less than the thickness of the space inter-electrodes, the pads being distributed in groups of at least three studs to form housing for receiving balls forming spacers.
  • each group of studs has four studs aligned two by two in perpendicular directions.
  • the flat screen has a group of studs at each intersection of two isolating intervals separating neighboring pixels.
  • the pads are formed on a layer of silicon oxide, constituting an electrode of the screen.
  • the studs are deposited by screen printing in a thick layer.
  • said at least one plate carries a microtip cathode associated with a grid, the intersection of a cathode conductor with a grid conductor defining a screen pixel.
  • said at least one plate is an anode plate.
  • openings for receiving phosphor elements are provided in an insulation layer attached to conductors anode, said openings being, at least in one direction, of a size corresponding to a first dimension of a pixel of the screen.
  • the anode has three sets of alternating strips of conductors, the insulation layer attached to said conductors being opened in sections in line with each strip, the width of three associated parallel bands defining a second dimension of a screen pixel.
  • the present invention provides for forming on the face internal of the screen plate where to deposit balls forming spacers, pads for temporarily holding these balls until the screen is sealed.
  • these studs are arranged in groups, each defining a housing receiving a ball.
  • FIGS. 2A and 2B represent an embodiment studs or bars 20 for temporarily holding spacers according to the present invention.
  • the pads 20 can be formed directly by screen printing silicon oxide, or other material, preferably insulator, depositable by screen printing in a thick layer, on a anode or cathode plate.
  • the pads 20 are distributed by groups of at least three studs arranged to define a housing 22 for temporarily holding a ball 23 constituting a spacer.
  • each group consists of four pads 20 aligned two by two, in two perpendicular directions between they preferably correspond to the directions of the lines and screen columns.
  • the studs 20 are arranged at the right of the intervals that separate the pixels of the screen, therefore outside the active areas of the screen.
  • the gap between two aligned pads 20 of the same housing 22 is chosen to allow the affixing of a ball 23 in taking into account the positioning tolerances (generally +/- 10 ⁇ m) imposed by the ball positioning tool.
  • the height of the studs 20, is chosen according to the diameter of the balls 23, preferably between 10 and 25% of the diameter marbles. For example, for balls with a diameter of around 200 ⁇ m, studs with a height of around 25 ⁇ m.
  • Each housing 22 is intended to receive, without bonding, a ball 23 and hold it in place as long as the second screen plate has not been reported on the first plate.
  • An advantage of the present invention is that the use to studs 20 avoids the need for heat treatments of vacuum degassing to eliminate pollution caused by layers of glue during conventional deposition of the beads.
  • Another advantage of the present invention is that the use of screen-printed pads provides excellent precision in the positions of the housings 22 on the internal face of the plate concerned.
  • the studs can be engraved in a thick layer beforehand uniformly deposited.
  • Figure 3 is a partial view of a screen cathode display plate provided with studs according to one embodiment of the present invention.
  • the cathode is organized in columns K and consists, on a substrate 10 for example of glass, of conductors 30 organized in meshes from a conductive layer (dotted in Figure 3). 2 microtips are produced on a resistive layer (not shown) deposited, by example, on conductors 30 and are arranged inside meshes defined by these conductors 30.
  • the mesh of cathode conductors has not been shown for reasons of clarity.
  • the cathode is associated with a grid organized in lines L and consisting of conductors 31 formed in a conductive layer deposited on an insulating layer 32, for example made of SiO 2 , attached to the cathode conductors.
  • the conductors 31 are therefore separated from each other by insulating intervals 33.
  • the conductors 30 are separated from each other by insulating intervals 34.
  • the conductors 31 and the layer 32 are open at the locations of the microtips 2.
  • the pixels 35 of the screen are defined by the intersection of a line L with a column K. For reasons of clarity, only a few microtips 2 have been represented per pixel 35. It will however be noted that each pixel comprises several thousand microtips .
  • pads 20 are formed on the layer insulation 32 in the intervals 33 which separate the conductors 31 of the grid and in the intervals 34 which separate the cathode conductors 30.
  • a group of four studs 20, defining a housing 22 for receiving a ball 23, comprises two pads aligned between two conductors 30 and two pads aligned between two conductors 31.
  • the number of groups of studs formed between the pixels 35 depends on the desired density of beads in the inter-electrode space.
  • a group of studs 20 is provided between each pixel, that is to say that the pads 20 are provided in each interval 33 and 34. Note, however, that even if we made plots between each pixel 35, it is later possible not to deposit a ball in each housing 22 according to the desired density of spacers.
  • the pads 20, anode side and not cathode side it is preferred to make the pads 20, anode side and not cathode side.
  • a positioning of the balls 3 anode side is now possible insofar as, according to the invention, this positioning does not require any heat treatment additional to the method of making the anode and, in particular, no hot degassing of a glue fixing the balls.
  • a first advantage of positioning the balls on the side anode is that it does not add any step to the production process of the cathode which is already, by the presence of microtips, a very delicate process to implement.
  • a second benefit is that the studs 20 can then be deposited using the same technique (screen printing) than that which is generally used for the realization of the anode.
  • FIG. 4 partially represents a view of below, a color anode provided with temporary holding pads spacers according to one embodiment of the present invention.
  • the anode is conventionally provided with strips of conductors 40 produced on a glass substrate 6, separated from each other by an insulator 41, generally SiO 2 , and on which phosphor elements 7 of different colors are deposited. .
  • the strips 40 are interconnected by color of phosphor elements, that is to say that they constitute three combs of alternating strips of conductors 40r, 40g, 40b, each corresponding to a color.
  • the phosphor elements 7r, 7g, 7b are no longer deposited in unbroken bands, but are deposited according to the screen pixel pattern.
  • the insulation layer 41 is open, perpendicular to the conductors 40, by sections 42, the length of a section 42 corresponding to a dimension of a screen pixel.
  • the other dimension of a pixel is defined by the width of a group of three corresponding sections 42 each one has a color.
  • pads 20 are deposited by screen printing in the insulation layer 41, preferably between each screen pixel.
  • the pads 20 are arranged, in a first direction, between two groups of three conductors 40, therefore between two neighboring pixels in this direction and in a second direction, perpendicular to the conductors 40, between two neighboring pixels.
  • An advantage of the present invention is that it is perfectly compatible with conventional positioning tools marbles.
  • FIGS. 5A to 5C illustrate, very schematically, the use of a ball positioning tool such that a collective positioning tool described in the document FR-A-2727242.
  • FIG. 5A We start (Figure 5A) by sucking balls 23 from a ball tank (not shown), by means of a plate applicator consisting of a plate 50 provided with notches 51 in the desired locations for the balls 23.
  • a plate applicator consisting of a plate 50 provided with notches 51 in the desired locations for the balls 23.
  • Each notch 51 is open to communicate, via a filter 52 (for example, porous paper), with a suction chamber 53 one orifice 54 of which is connected to a pump (not shown).
  • the distribution of the notches 51 in the plate 50 corresponds to the desired locations of the balls 23, at a step corresponding to the screen pixels or a multiple of the pixel pitch.
  • the plate 50 is positioned vertically a screen plate 55 (anode or cathode) on which have been made of studs 20 as described above.
  • Plate 55 is held in a substantially horizontal position, facing internal directed upwards.
  • the present invention is susceptible of various variants and modifications which will appear to those skilled in the art.
  • the invention also applies to a monochrome screen.
  • the screen pixels are also defined on the anode side by pixel size apertures in an isolation layer in silicon oxide.
  • studs 20 can be produced on the two screen plates.

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)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP98410032A 1997-03-28 1998-03-26 Montieren von Abstandshältern in einer flachen Anzeigetafel Withdrawn EP0867912A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9704096A FR2761523B1 (fr) 1997-03-28 1997-03-28 Pose d'espaceurs dans un ecran plat de visualisation
FR9704096 1997-03-28

Publications (1)

Publication Number Publication Date
EP0867912A1 true EP0867912A1 (de) 1998-09-30

Family

ID=9505500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98410032A Withdrawn EP0867912A1 (de) 1997-03-28 1998-03-26 Montieren von Abstandshältern in einer flachen Anzeigetafel

Country Status (4)

Country Link
US (1) US6066915A (de)
EP (1) EP0867912A1 (de)
JP (1) JPH10326585A (de)
FR (1) FR2761523B1 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2263851A1 (en) * 1996-08-21 1998-02-26 Damien Dunnington Rapid process for arraying and synthesizing bead-based combinatorial libraries
US20070122997A1 (en) 1998-02-19 2007-05-31 Silicon Genesis Corporation Controlled process and resulting device
US6146979A (en) 1997-05-12 2000-11-14 Silicon Genesis Corporation Pressurized microbubble thin film separation process using a reusable substrate
DE19817478B4 (de) * 1998-04-20 2004-03-18 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Flache Entladungslampe und Verfahren zu ihrer Herstellung
FR2800512B1 (fr) * 1999-10-28 2002-03-01 Pixtech Sa Ecran plat de visualisation a grille de protection
FR2809864A1 (fr) * 2000-05-30 2001-12-07 Pixtech Sa Outillage de pose d'espaceurs dans un ecran plat de visualisation
JPWO2003102999A1 (ja) * 2002-06-04 2005-10-06 株式会社東芝 画像表示装置
JP3892769B2 (ja) 2002-07-08 2007-03-14 株式会社 日立ディスプレイズ 表示装置
US9362439B2 (en) 2008-05-07 2016-06-07 Silicon Genesis Corporation Layer transfer of films utilizing controlled shear region
US8993410B2 (en) 2006-09-08 2015-03-31 Silicon Genesis Corporation Substrate cleaving under controlled stress conditions
US8293619B2 (en) 2008-08-28 2012-10-23 Silicon Genesis Corporation Layer transfer of films utilizing controlled propagation
US8330126B2 (en) 2008-08-25 2012-12-11 Silicon Genesis Corporation Race track configuration and method for wafering silicon solar substrates
US8329557B2 (en) 2009-05-13 2012-12-11 Silicon Genesis Corporation Techniques for forming thin films by implantation with reduced channeling
CN104798170A (zh) * 2012-11-21 2015-07-22 加州理工学院 用于制造基于碳纳米管的真空电子器件的系统和方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068600A2 (de) * 1981-06-26 1983-01-05 Control Data Corporation Verfahren zur Herstellung einer ausgerichteten Anordnung mehrerer flacher Elemente und dadurch hergestellte ausgerichtete Anordung
JPH01107438A (ja) * 1987-10-21 1989-04-25 Sony Corp フラットディスプレイ装置の電極スペーサの形成方法
WO1994015244A1 (fr) * 1992-12-29 1994-07-07 Pixel International S.A. Espaceurs pour ecrans plats de visualisation et procedes de mise en ×uvre de ces espaceurs
EP0622826A1 (de) * 1993-04-28 1994-11-02 Hamamatsu Photonics K.K. Photovervielfacher
EP0623944A1 (de) * 1993-05-05 1994-11-09 AT&T Corp. Flache Bildwiedergabeanordnung und Herstellungsverfahren

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Publication number Priority date Publication date Assignee Title
US5343115A (en) * 1992-05-15 1994-08-30 Thomas Electronics Incorporated Efficient large area multi-channel flat fluorescent lamp
US5600203A (en) * 1993-04-26 1997-02-04 Futaba Denshi Kogyo Kabushiki Kaisha Airtight envelope for image display panel, image display panel and method for producing same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068600A2 (de) * 1981-06-26 1983-01-05 Control Data Corporation Verfahren zur Herstellung einer ausgerichteten Anordnung mehrerer flacher Elemente und dadurch hergestellte ausgerichtete Anordung
JPH01107438A (ja) * 1987-10-21 1989-04-25 Sony Corp フラットディスプレイ装置の電極スペーサの形成方法
WO1994015244A1 (fr) * 1992-12-29 1994-07-07 Pixel International S.A. Espaceurs pour ecrans plats de visualisation et procedes de mise en ×uvre de ces espaceurs
EP0622826A1 (de) * 1993-04-28 1994-11-02 Hamamatsu Photonics K.K. Photovervielfacher
EP0623944A1 (de) * 1993-05-05 1994-11-09 AT&T Corp. Flache Bildwiedergabeanordnung und Herstellungsverfahren

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
I.F.CHANG ET AL.: "spacing technique for gas-discharge display panel", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 19, no. 10, March 1977 (1977-03-01), pages 3951 - 3952, XP002049040 *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 348 (E - 799) 4 August 1989 (1989-08-04) *
S.GRIVJACK: "display panel spherical spacers and application", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 20, no. 9, February 1978 (1978-02-01), pages 3496, XP002049041 *

Also Published As

Publication number Publication date
FR2761523B1 (fr) 1999-06-04
JPH10326585A (ja) 1998-12-08
US6066915A (en) 2000-05-23
FR2761523A1 (fr) 1998-10-02

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