EP0546137B1 - Elektrische isolierende bauteile fuer plasmaschirm und verfahren zur herstellung solcher bauteilen - Google Patents

Elektrische isolierende bauteile fuer plasmaschirm und verfahren zur herstellung solcher bauteilen Download PDF

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Publication number
EP0546137B1
EP0546137B1 EP92912967A EP92912967A EP0546137B1 EP 0546137 B1 EP0546137 B1 EP 0546137B1 EP 92912967 A EP92912967 A EP 92912967A EP 92912967 A EP92912967 A EP 92912967A EP 0546137 B1 EP0546137 B1 EP 0546137B1
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EP
European Patent Office
Prior art keywords
organic compound
display according
anyone
electrodes
temperature
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Expired - Lifetime
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EP92912967A
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English (en)
French (fr)
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EP0546137A1 (de
Inventor
Guy Baret
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Thales Electron Devices SA
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Thomson Tubes Electroniques
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/38—Dielectric or insulating layers

Definitions

  • the invention relates to display screens of the plasma panel type, and more particularly to the electrically insulating elements used in these devices.
  • Plasma panels are flat display screens that operate on the principle of luminescent discharges in a gas. They include two insulating tiles, joined together so as to define a calibrated space between them. This space is formed in a sealed manner at the periphery of the slabs in order to form a gas space.
  • the electrical discharges in the gas are obtained using electrodes to which electrical voltages are applied.
  • the electrodes can be distributed on either side of the gas space: in this case most often an array of electrodes is carried by a slab and at least one other array of electrodes is carried by the other slab.
  • the two networks are orthogonal to each other, and an elementary cell or pixel is defined at each intersection of electrodes.
  • the electrodes can also be arranged on the same side with respect to the gas space, that is to say be carried by the same slab.
  • the alternative panels have the advantage of presenting a memory effect which makes it possible to address the useful information only to the pixels whose state one wishes to change (on or off) on the other pixels, the state of the latter is simply maintained by repetition of alternating electrical discharges, called maintenance discharges.
  • This memory effect is obtained by electrically isolating the electrodes from the discharge gas, by covering with a dielectric layer on which accumulate the charged particles generated by the discharge in the gas.
  • the article in IBM Technical Disclosure Bulletin Volume 24 No 1B of June 1981 gives the structure of plasma panels of the alternative type.
  • the electrodes are covered with a dielectric layer, in particular in alumina or magnesia, which is itself protected against ion bombardment by a second layer, for example in magnesia.
  • Such discharge barriers can also be used in "PAPs” whose cells or pixels are formed at the crossing of only two electrodes, and their presence is practically essential in “PAPs” of the “continuous” type.
  • the discharge barriers can be constituted by pieces forming shims, called spacers, which define the height of the gas space.
  • FIG. 1 shows a plasma panel of the type with two crossed electrodes to define a cell or pixel.
  • the figure is a sectional view parallel to one of these two electrodes.
  • the panel 1 comprises two tiles 2, 3 each carrying an array of electrodes.
  • the slabs 2, 3 constitute substrates, they commonly have a thickness E1 of the order of 1 to 6 mm.
  • the first panel 2 carries a first network of electrodes Y1 to Yn parallel.
  • the second panel 3 carries a second array of parallel electrodes represented by an electrode X (shown parallel to the plane of the figure) orthogonal to the electrodes Y1 to Yn.
  • the electrodes Y1 to Yn are covered with a dielectric layer 4, the thickness E2 of which is commonly of the order of 20 to 30 micrometers.
  • the dielectric layer 4 is covered by a protective layer 5 often made of Mg0, the thickness of which is very small, of the order of 0.2 micrometers.
  • the electrodes X of the second network are covered by a second dielectric layer 6 having substantially the same thickness E2 as the first.
  • This second dielectric layer is itself covered with a second protective layer 7 similar to the first 5.
  • ends 8 of the electrode X, not covered by the dielectric layer 6, constitute sockets contact.
  • the two tiles 2, 3 are intended to be assembled so as to provide between them a space 10 which must contain a gas, neon for example, at a pressure of for example 500 mb.
  • the panel 1 has sealing joints 11 arranged at the periphery of one of the slabs, the second slab 3 for example.
  • the height H1 of the gas space 10 is defined using spacers 12 called spacers, arranged at the periphery of a slab, of the first slab 2 for example.
  • the spacers 12 are produced on the first dielectric layer 4, and in the bringing together of the two slabs 2, 3, these spacers must come into abutment on the second protective layer 7 these conditions are taken into account to define the height H2 of these spacers 12 in order to give the gas space the desired height H1, height H1 (of the gas space) which is commonly of the order of 100 micrometers.
  • the sealing joints 11 generally consist of a glass with a low melting point (between 380 ° C. and 450 ° C.). They have a height H3 such that, taking into account the surface on which they are arranged (surface of the second dielectric layer in the example), it is necessary to crush them to bring the spacers 12 into abutment on the second slab 3 , so as to thus seal the gas space 10.
  • the quality of operation of the "PAP" can be degraded if the height H1 of the gas space shows too great variations.
  • central spacers 15 it is also possible to use such central spacers 15 to further perform a separation barrier function between the discharges of contiguous pixels.
  • Each pixel being defined in the area of intersection of electrodes X and Y, it is known to produce such central spacers 15, with a parallelepiped shape for example and to arrange them so as to surround each pixel.
  • the separators or barriers 12, 15 are generally made of mineral glass: walls of mineral glass are formed in several intermediate layers by successive screen printing. These successive serigraphs are followed by a final baking to densify and harden the material.
  • the layers produced by successive screen prints are difficult to superimpose with precision: thus for a layer whose width is for example 50 micrometers, it it is not uncommon for it to overflow 10 micrometers from the previous layer, so that finally these partitions or barriers have variable widths, the dimensions of which are difficult to control. This further results in a degradation of the operation of the plasma panel.
  • the temperature can reach, for example, 530 ° C. to 600 ° C. This may result in degradation of the glass which forms the slabs 2, 3 and / or degradation of the conductive deposits which form the electrodes. For example, the glass softens and loses its flatness if it does not rest on a perfectly flat support.
  • Another method for making spacers (which in this case does not additionally fulfill the discharge barrier function) consists in depositing a dense network of calibrated glass beads, regularly arranged between the electrodes.
  • the precision on the diameter of the balls is insufficient to obtain that the greatest number of balls are in contact at the same time with the two slabs or substrates.
  • the general structure shown in the figure is the same, the difference being that in this case the dielectric layers 4, 6 and the protective layers 5, 7 do not exist, so that the electrodes X, Y1 to Yn are in contact with the gas contained in the gas space 10.
  • the glass begins to react with the conductive or dielectric layers deposited on its surface, and in particular with the materials constituting the electrodes.
  • this vitreous dielectric offers the advantage of very good mechanical and chemical stability, during the subsequent step of sealing the plasma panel, which step requires temperatures of at least 400 ° C.
  • the invention proposes to produce these elements from materials whose implementation work does not require exposing the entire plasma panel to a temperature much higher than that required in the sealing step.
  • the invention proposes to produce at least one dielectric layer disposed between the gas space and electrodes in a polymerizable organic compound, and thermostable for temperatures equal to or lower than the sealing temperature of the plasma panel in which it went up.
  • the resulting advantage is that the highest temperature imposed on the plasma panel is that necessary to effect the sealing.
  • Spacers and / or discharge barriers can also be produced in a polymerizable organic compound and this compound can be photosensitive, which makes it possible to engrave it in a simple manner by conventional photolithography processes, and to obtain any type of pattern with a excellent resolution and uniform thickness.
  • the invention therefore relates to a plasma panel as defined in claim 1.
  • the invention further relates to a method for producing such electrically insulating elements.
  • the plasma panel 1 comprises two panels 2, 3 each carrying an array of electrodes X, Y1 to Yn, so that these electrodes are arranged on either side of the gas space 10 formed between the slabs 2, 3.
  • at least one dielectric layer 4, 6 is required interposed between each network of electrodes and the gas space 10, ie at least two dielectric layers.
  • the invention proposes to produce them with a thermostable polymerizable organic compound.
  • the basic organic compound can be a solution in a suitable solvent (xylene or metacresol for example) of a dianhydride and a diamine (the formulas of which are given below) for obtaining a polyimide: diamine: NH2 - AR2 - NH2 where AR1 and AR2 are aromatic chains.
  • a suitable solvent xylene or metacresol for example
  • diamine the formulas of which are given below
  • the organic compound can be deposited by the usual methods of depositing so-called “thick" layers, for example the following methods: spinner, spray (projection), soaking, roller or screen printing; conventionally in itself, the viscosity of the product can be adapted to the method used by varying the fraction of polymer in the solvent.
  • the final polymerization temperature should preferably be greater than or equal to the temperature of the panel sealing step. For example, a layer of final thickness of approximately 5 micrometers of polyphenylquinoxaline polymerized at 410 ° C for 10 minutes, will no longer evolve chemically and mechanically during a sealing step at 400 ° C.
  • the step of sealing a PAP is the step in which the two slabs 2, 3 are brought together, to obtain the desired height H1 of the gas space 10, and in which deforms the sealing joints 11 to make the seal.
  • organic compound can be loaded with mineral and / or metallic compounds, for example in order to modify the dielectric constant and / or to modify the color thereof.
  • the relative dielectric constant Er of the organic compounds used can be between 2 and 4 for the pure compound (for example a polyimide) and it can be increased to reach values greater than 10.
  • the thicknesses can vary from less than 1 micrometer to several tens of micrometers, depending on the dielectric capacity desired by the layer.
  • the possible color of the final deposit can also be adjusted by adding an organic dye or a mineral compound. Black or white deposits can also be obtained in this way.
  • thermostable organic compound as defined above, can be polymerized at relatively low temperatures, so as not to cause deformation of the substrate. glass or slab 2, 3, nor degrade the other layers deposited on this substrate. In particular, the organic compound does not react with the electrode material (ITO, metal, etc.).
  • the organic compound allows a homogeneous covering of the electrodes and therefore supports high electric fields without showing any phenomenon of electrical breakdown.
  • the invention applies as well to the case where the dielectric layers are produced along continuous surfaces as in the case of discontinuous surfaces.
  • a polymerizable organic compound similar to that indicated above for the dielectric layers, can constitute the basic material for the production of the spacers and barriers 12, 15.
  • the organic compound can be loaded with mineral and / or metallic compounds, in order to vary the viscosity and / or the color and / or the resistance to crushing after polymerization.
  • the organic compound can be spread on the substrate or slab 2, 3 by usual methods similar to those mentioned above for the dielectric layers (spin, spray, screen printing, etc.).
  • Photosensitive organic compounds are commercially available.
  • the exposure and photogravure phase occurs after the last deposit has dried, and before polymerization or following partial polymerization of the organic compound.
  • the polymerization of the organic compound is obtained by exposing it to a heat treatment and / or by exposure to ultraviolet rays, in a manner in itself conventional.
  • the photo-imageable nature of the organic compound makes it possible to impart, simply and securely, to the spacers and barriers 12, 15, the desired dimensions as well as the desired positions in particular relative to the electrodes X, Y1 to Yn.
  • This characteristic is particularly advantageous in the case of barriers 15 whose width L, relative to the pitch P of the cells, must remain relatively small, and whose position between the cells is also important.
  • spacers or barriers 12, 15 thus produced are thermostable and do not tend to creep: it is therefore possible to obtain ratios of height H2 to width L (H1 / L) greater than 1, for heights H2 greater than 200 micrometers .
  • the invention can be applied to the production of any electrically insulating element carried by a PAP slab, whether the latter is of the continuous or alternative type, monochrome or polychrome, whatever the distribution of the electrodes relative to the gas space. , and regardless of the number of electrodes used to define a cell.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Claims (11)

  1. Anzeigevorrichtung nach Art eines Plasmabildschirms mit zwei Platten (2, 3), von denen mindestens eine Elektroden (X, Y1 bis Yn) trägt, wobei die beiden Platten (2, 3) derart angeordnet sind, daß ein Zwischenraum (10) zwischen diesen beiden Platten gebildet wird, wobei der Zwischenraum zur Bildung eines Gasraums bestimmt ist, dessen Dichtheit durch einen "Verkapselung" genannten Vorgang verwirklicht wird, wobei mindestens eine dielektrische Schicht (4, 6) zwischen dem Gasraum (10) und den Elektroden (X, Y1 bis Yn) angeordnet ist, dadurch gekennzeichnet, daß die Schicht (4, 6) aus einer polymerisierbaren organischen Verbindung besteht.
  2. Anzeigevorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie mindestens einen Abstandhalter (12, 15) umfaßt, der die Höhe (H1) des Gasraums (10) bestimmt und der ebenfalls aus einer polymerisierbaren organischen Verbindung besteht.
  3. Anzeigevorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie mindestens eine Entladungssperre (15) aus einer polymerisierbaren organischen Verbindung aufweist.
  4. Anzeigevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die polymerisierbare organische Verbindung aus einem Monomerengemisch erhalten wird.
  5. Anzeigevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die polymerisierbare organische Verbindung aus Polyimid besteht.
  6. Anzeigevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die organische Verbindung bis zu einer Temperatur wärmebeständig ist, die mindestens gleich einer während der Verkapselung erzeugten Temperatur ist.
  7. Anzeigevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die organische Verbindung lichtempfindlich ist.
  8. Anzeigevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die organische Verbindung bei einer Temperatur polymerisierbar ist, die niedriger oder genau gleich einer Temperatur ist, welche ein Erweichen mindestens einer Platte (2, 3) hervorruft.
  9. Anzeigevorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die organische Verbindung mit mineralischen und/oder metallischen Erzeugnissen oder Verbindungen als Füllstoffen versehen wird.
  10. Verfahren zur Herstellung einer Anzeigevorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß es darin besteht, daß die organische Verbindung durch Isolierung gegenüber ultravioletten Strahlen stabilisiert wird.
  11. Verfahren zur Herstellung einer Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß es darin besteht, die organische Verbindung dadurch zu stabilisieren, daß sie einer Temperatur ausgesetzt wird, die zwischen der während der Verkapselungsstufe erzeugten Temperatur und einer Erweichungstemperatur mindestens einer der Platten (2, 3) liegt.
EP92912967A 1991-06-27 1992-06-19 Elektrische isolierende bauteile fuer plasmaschirm und verfahren zur herstellung solcher bauteilen Expired - Lifetime EP0546137B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9108004A FR2678424A1 (fr) 1991-06-27 1991-06-27 Elements electriquement isolants pour panneaux a plasma et procede pour la realisation de tels elements.
FR9108004 1991-06-27
PCT/FR1992/000561 WO1993000698A1 (fr) 1991-06-27 1992-06-19 Elements electriquement isolants pour panneaux a plasma et procede pour la realisation de tels elements

Publications (2)

Publication Number Publication Date
EP0546137A1 EP0546137A1 (de) 1993-06-16
EP0546137B1 true EP0546137B1 (de) 1995-09-06

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EP92912967A Expired - Lifetime EP0546137B1 (de) 1991-06-27 1992-06-19 Elektrische isolierende bauteile fuer plasmaschirm und verfahren zur herstellung solcher bauteilen

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US (1) US5336121A (de)
EP (1) EP0546137B1 (de)
JP (1) JP3270045B2 (de)
DE (1) DE69204632T2 (de)
FR (1) FR2678424A1 (de)
WO (1) WO1993000698A1 (de)

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FR2748469B1 (fr) * 1996-05-07 1998-07-31 Thomson Csf Utilisation d'une barriere en nitrure pour eviter la diffusion d'argent dans du verre
JPH1027550A (ja) * 1996-05-09 1998-01-27 Pioneer Electron Corp プラズマディスプレイパネル
DE19727607C2 (de) * 1997-06-28 2000-11-23 Philips Corp Intellectual Pty Plasmabildschirm mit einer UV-Leuchtstoffzubereitung und UV-Leuchtstoffzubereitung
JP3606038B2 (ja) * 1998-03-31 2005-01-05 松下電器産業株式会社 プラズマディスプレイパネル
US7002287B1 (en) * 1998-05-29 2006-02-21 Candescent Intellectual Property Services, Inc. Protected substrate structure for a field emission display device
US6215241B1 (en) 1998-05-29 2001-04-10 Candescent Technologies Corporation Flat panel display with encapsulated matrix structure
US6853129B1 (en) 2000-07-28 2005-02-08 Candescent Technologies Corporation Protected substrate structure for a field emission display device
US6614168B2 (en) * 2002-01-11 2003-09-02 Industrial Technology Research Institute Package method for field emission display
KR100533723B1 (ko) * 2003-04-25 2005-12-06 엘지전자 주식회사 플라즈마 디스플레이 패널 및 그 제조방법
WO2007087371A2 (en) 2006-01-23 2007-08-02 The Board Of Trustees Of The University Of Illinois Polymer microcavity and microchannel devices and fabrication method
KR101113853B1 (ko) * 2006-02-27 2012-02-29 삼성테크윈 주식회사 플라즈마 디스플레이 패널과, 디스플레이 패널용 전극 매립유전체 벽 제조 방법과, 상기 플라즈마 디스플레이 패널용전극 매립 유전체 벽 제조 방법
JP2008262931A (ja) * 2008-08-05 2008-10-30 Toray Ind Inc プラズマディスプレイパネルの緩衝層形成用ペースト

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Publication number Publication date
DE69204632D1 (de) 1995-10-12
WO1993000698A1 (fr) 1993-01-07
US5336121A (en) 1994-08-09
FR2678424A1 (fr) 1992-12-31
JP3270045B2 (ja) 2002-04-02
JPH06500891A (ja) 1994-01-27
EP0546137A1 (de) 1993-06-16
DE69204632T2 (de) 1996-02-08

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