EP0133492B1 - Gas discharge display having a spacing frame - Google Patents

Gas discharge display having a spacing frame Download PDF

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Publication number
EP0133492B1
EP0133492B1 EP84108495A EP84108495A EP0133492B1 EP 0133492 B1 EP0133492 B1 EP 0133492B1 EP 84108495 A EP84108495 A EP 84108495A EP 84108495 A EP84108495 A EP 84108495A EP 0133492 B1 EP0133492 B1 EP 0133492B1
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EP
European Patent Office
Prior art keywords
post
acceleration
space
frame
gas discharge
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EP84108495A
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German (de)
French (fr)
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EP0133492A2 (en
EP0133492A3 (en
Inventor
Wilhelm Huber
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Siemens AG
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Siemens AG
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Priority to AT84108495T priority Critical patent/ATE26627T1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
    • H01J17/498—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with a gas discharge space and a post acceleration space for electrons

Definitions

  • the invention relates to a display device according to the preamble of claim 1.
  • a display device according to the preamble of claim 1.
  • Such a plasma panel is described in EP-A-31921 (DE-A 29 52 528).
  • a gas discharge supplies electrons which are sent through selected holes in a control matrix into a post-acceleration space, where they absorb energies of a few kV and finally generate light spots on a phosphor layer.
  • the post-acceleration path is plasma-free, despite the high voltage present, for the following reason: for each gas, the ignition voltage V z depends on the product of the gas pressure p and the electrode distance d, such that V z initially drops steeply with increasing p ⁇ d, then a minimum passes through and then gradually increases again ( «Paschen's Law •). This means that for a given gas with certain voltage and pressure values, discharge is prevented if the operating point is far enough in the left branch of the ignition curve, i.e. d has sufficiently small values.
  • the invention has for its object to provide the spacing frame in a panel of the type mentioned in such a way that it insulates even better.
  • This object is achieved in that the spacer frame has a rough surface at least on its inside, whereby rough means a fourth-order design deviation, see DIN 4760, and the rough surface has an average surface roughness R z , for which 1 ⁇ m ⁇ R z ⁇ 100 ⁇ m, and the surface has a maximum roughness depth R max , for which R max ⁇ 250 ⁇ m.
  • the proposed solution is based on the following observation:
  • the spacer frames previously used consisted of a glass pane from which a window had been mechanically separated. Such treatment always leaves broken edges and mussels on the inside of the frame, from which the disruptive (glide and tip) discharges emanate during operation of the display, even if protrusions extending into the frame had been incorporated.
  • a frame designed according to the invention is free of such burrs. Instead, its endangered surface has a specific microstructure that - obviously - results in a long effective insulation section, but does not contain any formations that could trigger a breakthrough. This behavior has complex causes that cannot yet be completely overlooked; The fact is, however, that a conventional frame allows much higher voltages after the matting proposed here.
  • the surface to be treated is preferably roughened by a blasting technique, for example by bombardment with A1 2 0 3 or glass beads. It is advisable to proceed in two steps and to work first with pearls of larger diameter and then with smaller pearls. A blasted surface is clean; it no longer needs to be freed of residues that are known to have a significant impact on the rollover strength.
  • the rough frame surface is also provided with a conductive material, in such an amount that no continuous layer is formed.
  • a conductive material such as Cu. That such a coating promotes short-circuit strength is probably due to the fact that it linearizes the potential gradient along the frame surface in the manner of an extremely high-resistance surface resistance and thus prevents local increases in field strength.
  • the display shown contains a vacuum-tight, gas-filled envelope with a trough-like rear part 1 and a front plate 2 extending parallel to the trough bottom.
  • the inside of the envelope is divided by a control plate 3 parallel to the front plate into a rear gas discharge space 4 and a front post-acceleration space 5.
  • the control disk 3 carries row conductors (the plasma anode) 6 on its rear side and column conductors (the post-acceleration cathode) 7 running on its front side perpendicular to the row conductors 7. All conductors can be controlled individually; together they form a tax matrix.
  • the control structure formed from the control disk and the matrix conductors is provided with a passage opening 8.
  • the tub base has on its front side several mutually parallel plasma cathode strips 9, and the back of the font plate 1 is provided with phosphor strips 10 parallel to the column conductors and a continuous post-acceleration anode 11.
  • the control disk 3 is spaced from the front plate 2 by a spacer frame 12, which is connected on both sides in a vacuum-tight manner to the control disk or the front plate by a glass solder seam 13, 14. The connection between the control disc and the tub is made via a glass solder seam 15.
  • the frame projects inward beyond the two glass solder seams 13, 14 and has a rounded profile with a rough surface there.
  • This frame can be produced rationally as follows: First, cut a window out of an approx. 1.1 mm thick soft glass pane with a diamond cutting disc. Then the inside of the frame thus obtained is rounded off with a blasting technique, matted and coated with Cu. For this purpose, the frame is first blasted with A1 2 0 3 beads up to 120 kt m thick and then lapped with a jet of glass beads up to 60 ⁇ m thick. The glass beads are covered with Cu. Then you rinse the treated surface; a special cleaning process is not necessary.
  • Figures 2 and 3 give an impression of the structure of the rough frame surface. They have emerged from scanning electron microscope images on an Au-metallized surface and show the surface in a magnification of 400 or 2000 times. From these figures it can be estimated that the roughness of this shallow mountain range is on average between 10 ⁇ m and 15 ⁇ m and reaches a maximum of 40 ⁇ m (DIN 4768, sheet 1).
  • the gas discharge could also be generated in a different form - for example as a stationary transverse plasma - and / or the electrodes could be organized differently, for example to have the same conductors function as plasma cathodes and row conductors or to work with a deflection in the high-voltage room. That being said, other frame materials and / or other matting methods are also possible; Certain ceramics and special etching techniques would be conceivable. Otherwise, the person skilled in the art is at liberty to roughen the surfaces of these additional bodies in the same way in cases in which further spacer elements are provided in addition to the spacer frame.

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  • Gas-Filled Discharge Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

Gas discharge display device having a vacuum-tight gas-filled envelope with a front plate and a back plate. A perforated control unit divides the interior of the envelope into a gas discharge space and a post-acceleration space and includes several electrode planes extending parallel to the plates. The gas discharge space has at least one plasma cathode and at least one plasma anode. The front layer carries on its back side a cathodoluminescent layer as well as an electrically conducting layer (post-acceleration anode). A spacer frame spaces the conductor as post-acceleration cathode in the foremost electrode plane of the control unit from the post-acceleration anode. In operation, a gas discharge burns at least temporarily between the plasmas electrodes. Electrons are pulled through selectively opened holes of the control unit into the post-acceleration space. The post-acceleration space which remains free of discharges is accelerated to several kV. The spacer frame has a rough surface at least on its inside.

Description

Die Erfindung bezieht sich auf eine Anzeigevorrichtung gemäß dem Oberbegriff des Anspruchs 1. Ein solches Plasmapanel wird in der EP-A-31921 (DE-A 29 52 528) beschrieben.The invention relates to a display device according to the preamble of claim 1. Such a plasma panel is described in EP-A-31921 (DE-A 29 52 528).

Bei dem bekannten Display liefert eine Gasentladung Elektronen, die durch ausgewählte Löcher einer Steuermatrix in einen Nachbeschleunigungsraum geschickt werden, dort Energien von einigen kV aufnehmen und schließlich auf einer Phosphorschicht Lichtpunkte erzeugen. Die Nachbeschleunigungsstrecke ist trotz der anliegenden Hochspannung plasmafrei, und zwar aus folgendem Grund : Bei jedem Gas hängt die Zündspannung Vz vom Produkt aus Gasdruck p und Elektrodenabstand d ab, derart, daß Vz mit zunehmendem p · d zunächst steil abfällt, dann ein Minimum durchläuft und anschließend wieder allmählich ansteigt («Paschengesetz •). Das bedeutet, daß bei einem vorgegebenen Gas mit bestimmten Spannungs- und Druckwerten eine Entladung verhindert wird, wenn der Arbeitspunkt weit genug im linken Ast der Zündkurve liegt, also d hinreichend kleine Werte hat.In the known display, a gas discharge supplies electrons which are sent through selected holes in a control matrix into a post-acceleration space, where they absorb energies of a few kV and finally generate light spots on a phosphor layer. The post-acceleration path is plasma-free, despite the high voltage present, for the following reason: for each gas, the ignition voltage V z depends on the product of the gas pressure p and the electrode distance d, such that V z initially drops steeply with increasing p · d, then a minimum passes through and then gradually increases again («Paschen's Law •). This means that for a given gas with certain voltage and pressure values, discharge is prevented if the operating point is far enough in the left branch of the ignition curve, i.e. d has sufficiently small values.

In der Praxis ist der Nachbeschleunigungsraum jedoch bei weitem nicht so hochspannungsfest, wie dies die Zündspannungskurve eigentlich erwarten läßt. Beim Hochfahren der Spannung beobachtet man im Rahmenbereich Überschläge, die sich relativ rasch ausbreiten und an den Leiterstrukturen erhebliche Schäden verursachen können.In practice, however, the post-acceleration space is far from being as resistant to high voltages as the ignition voltage curve actually suggests. When the voltage is ramped up, flashovers are observed in the frame area, which spread relatively quickly and can cause considerable damage to the conductor structures.

Man hat deshalb schon relativ früh versucht; das Isolationsvermögen des Abstandsrahmens zu verbessern. So wird in der DE-A 26 15 681 empfohlen, dem Rahmen ein Profil mit äquidistanten Nuten zu geben. Darauf aufbauend ist in der eingangs zitierten Offenlegungsschrift vorgesehen, den Rahmen gegenüber seinen vor- und rückseitig aufgebrachten Abdichtnähten zur Zellenmitte hin vortreten zu lassen und seine Innenseite frei von Abdichtmaterial zu halten. Mit diesen Rahmenvarianten, die einen relativ langen Isolationsweg gemeinsam haben, kann man unter üblichen Bedingungen (Gasfüllung : He, p : 50 Pa (2,5 mbar), d: 1,7 mm) eine Nachbeschleunigungsspannung von immerhin 4 kV anlegen. Dieser Wert ermöglicht allerdings nicht in jedem Fall ausreichende Kontrast- und Helligkeitswerte. Wenn höchste Informationsmengen, etwa farbige Videosignale, zu verarbeiten sind, sollten die Elektronen eine Aufprallenergie von mindestens 6 kV haben.One therefore tried relatively early; to improve the insulating capacity of the spacer frame. In DE-A 26 15 681 it is recommended to give the frame a profile with equidistant grooves. Building on this, it is provided in the initially cited laid-open publication that the frame should protrude towards the center of the cell in relation to its sealing seams applied on the front and rear sides and that the inside be kept free of sealing material. With these frame variants, which have a relatively long insulation path in common, a post-acceleration voltage of at least 4 kV can be applied under normal conditions (gas filling: He, p: 50 Pa (2.5 mbar), d: 1.7 mm). However, this value does not always enable sufficient contrast and brightness values. If the highest amounts of information, such as colored video signals, are to be processed, the electrons should have an impact energy of at least 6 kV.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Panel der eingangs genannten Art den Abstandsrahmen so auszubilden, daß er noch besser isoliert. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Abstandsrahmen zumindest auf seiner Innenseite eine rauhe Oberfläche hat, wobei rauh eine Gestaltsabweichung vierter Ordnung, siehe DIN 4760, bedeutet und die rauhe Oberfläche eine gemittelte Rauhtiefe Rz hat, für die gilt 1 µm < Rz < 100 µm, und die Oberfläche eine maximale Rauhtiefe Rmax hat, für die gilt Rmax ≤ 250 µm.The invention has for its object to provide the spacing frame in a panel of the type mentioned in such a way that it insulates even better. This object is achieved in that the spacer frame has a rough surface at least on its inside, whereby rough means a fourth-order design deviation, see DIN 4760, and the rough surface has an average surface roughness R z , for which 1 µm <R z <100 µm, and the surface has a maximum roughness depth R max , for which R max ≤ 250 µm.

Der Lösungsvorschlag geht von folgender Beobachtung aus : Die bisher verwendeten Abstandrahmen bestanden aus einer Glasscheibe, aus der auf mechanischem Wege ein Fenster herausgetrennt worden war. Eine solche Behandlung hinterläßt an der Rahmeninnenseite stets Bruchkanten und Ausmuschelungen, von denen dann im Betrieb des Displays die störenden (Gleit- und Spitzen-) Entladungen ausgehen, und zwar auch dann, wenn man in den Rahmen wegverlängernde Vorsprünge eingearbeitet hatte. Ein erfindungsgemäß gestalteter Rahmen ist frei von solchen Graten. Seine gefährdete Oberfläche hat statt dessen eine spezifische Mikrostruktur, die - offensichtlich - eine lange wirksame Isolationsstrecke ergibt, dabei aber keine Formationen enthält, die einen Durchbruch auslösen könnten. Dieses Verhalten hat komplexe Ursachen, die sich derzeit noch nicht ganz übersehen lassen ; Tatsache ist aber, daß ein üblicher Rahmen nach der hier vorgeschlagenen Mattierung ganz wesentlich höhere Spannungen zuläßt.The proposed solution is based on the following observation: The spacer frames previously used consisted of a glass pane from which a window had been mechanically separated. Such treatment always leaves broken edges and mussels on the inside of the frame, from which the disruptive (glide and tip) discharges emanate during operation of the display, even if protrusions extending into the frame had been incorporated. A frame designed according to the invention is free of such burrs. Instead, its endangered surface has a specific microstructure that - obviously - results in a long effective insulation section, but does not contain any formations that could trigger a breakthrough. This behavior has complex causes that cannot yet be completely overlooked; The fact is, however, that a conventional frame allows much higher voltages after the matting proposed here.

Vorzugsweise wird die zu behandelnde Oberfläche durch eine Strahltechnik, etwa durch einen Beschuß mit A1203- oder Glasperlen, aufgerauht. Dabei ist es zweckmäßig, in zwei Schritten vorzugehen und zunächst mit Perlen größeren Durchmessers und anschließend mit kleineren Perlen zu arbeiten. Eine gestrahlte Oberfläche ist sauber ; sie braucht nicht mehr eigens von Rückständen, die bekanntlich die Überschlagsfestigkeit empfindlich beeinträchtigen können, befreit zu werden.The surface to be treated is preferably roughened by a blasting technique, for example by bombardment with A1 2 0 3 or glass beads. It is advisable to proceed in two steps and to work first with pearls of larger diameter and then with smaller pearls. A blasted surface is clean; it no longer needs to be freed of residues that are known to have a significant impact on the rollover strength.

Beste Resultate erzielt man, wenn man die rauhe Rahmenoberfläche auch noch mit einem leitenden Material versieht, und zwar in einer solchen Menge, daß noch keine durchgehende Schicht entsteht. Eine solche Belegung kommt schon dann zustande, wenn man die Fläche mit Kugeln strahlt, die bereits mit dem betreffenden Material, etwa Cu, beschichtet sind. Daß ein solcher Belag die Kurzschlußfestigkeit fördert, ist vermutlich darauf zurückzuführen, daß er nach Art eines extrem hochohmigen Oberfiächenwiderstandes das Potentialgefälle längs der Rahmenfläche linearisiert und somit lokale Feldstärkeüberhöhungen verhindert.The best results are obtained if the rough frame surface is also provided with a conductive material, in such an amount that no continuous layer is formed. Such an assignment is achieved when the surface is blasted with spheres that are already coated with the relevant material, such as Cu. That such a coating promotes short-circuit strength is probably due to the fact that it linearizes the potential gradient along the frame surface in the manner of an extremely high-resistance surface resistance and thus prevents local increases in field strength.

Vergleichsmessungen haben gezeigt, daß man durch die erfindungsgemäß vorgesehene Rahmenmattierung die Spannungsfestigkeit ohne weiteres um mehr als den Faktor 3 verbessern kann. Dieses erstaunliche Ergebnis eröffnet einen großen Optimierungsspielraum für eine Reihe wichtiger Parameter. So kann zunächst die Hochspannung auf einen besonders großen Wert eingestellt werden. In diesem Fall erreicht man die erforderlichen Darstellungsqualitäten mit minimalen Elektronenströmen, eine Betriebsweise, die die Leuchtstoffschicht schont und lange funktionstüchtig erhält. Daneben besteht auch noch die Möglichkeit, mit mäßig erhöhter Hochspannung und größerem Gasdruck zu arbeiten. Diese Maßnahmenkombination ist durchaus attraktiv, weil nämlich ein Teil des Gases nach mehreren hundert Betriebsstunden aufgezehrt wird und deshalb der Anfangsdruck über dem eigentlichen Betriebswert liegen sollte. Im übrigen hat man bei der Wahl der Gaszusammensetzung und des Abstandes zwischen den Nachbeschleunigungselektroden relativ freie Hand.Comparative measurements have shown that the dielectric strength provided according to the invention can be used to easily improve the dielectric strength by more than a factor of 3. This amazing result opens up a lot of room for optimization for a number of important parameters. In this way, the high voltage can first be set to a particularly large value. In this case, the required display qualities are achieved with minimal electron currents, a mode of operation that protects the phosphor layer and is long-lasting efficient. In addition, there is also the option of working with moderately increased high voltage and higher gas pressure. This combination of measures is quite attractive, because part of the gas is consumed after several hundred hours of operation and the initial pressure should therefore be above the actual operating value. In addition, the choice of gas composition and the distance between the post-acceleration electrodes is relatively free.

Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand zusätzlicher Ansprüche.Further advantageous refinements and developments of the invention are the subject of additional claims.

Der Lösungsvorschlag soll nun anhand eines bevorzugten Ausführungsbeispiels, unter Bezugnahme auf die beigefügte Zeichnung, näher erläutert werden. Von den Figuren der Zeichnung zeigen

  • Figur 1 das Ausführungsbeispiel in einem schematischen Seitenschnitt,
  • Figur 2 vom Abstandsrahmen dieses Ausführungsbeispiels die rauhe Oberfläche, in einer Vergrößerung, und
  • Figur 3 von der Fig. 2 einen - nochmals vergrößerten - Ausschnitt.
The proposed solution will now be explained in more detail using a preferred exemplary embodiment and with reference to the accompanying drawing. Show from the figures of the drawing
  • FIG. 1 shows the exemplary embodiment in a schematic side section,
  • Figure 2 of the spacer frame of this embodiment, the rough surface, in an enlargement, and
  • Figure 3 of Fig. 2 a - again enlarged - section.

Das dargestellte Display enthält eine vakuumdichte, gasgefüllte Hülle mit einem wannenartigen Rückteil 1 und einer parallel zum Wannenboden erstreckten Frontplatte 2. Das Hülleninnere wird durch eine frontplattenparallele Steuerscheibe 3 in einen hinteren Gasentladungsraum 4 und einen vorderen Nachbeschleunigungsraum 5 unterteilt. Die Steuerscheibe 3 trägt auf ihrer Rückseite Zeilenleiter (die Plasmaanode) 6 und auf ihrer Vorderseite senkrecht zu den Zeilenleitern verlaufende Spaltenleiter (die Nachbeschleunigungskathode) 7. Alle Leiter sind einzeln ansteuerbar ; sie bilden zusammen eine Steuermatrix. In jedem Matrixelement ist die aus der Steuerscheibe und den Matrixleitern gebildete Steuerstruktur mit einer Durchtrittsöffnung 8 versehen. Der Wannenboden trägt auf seiner Vorderseite mehrere zueinander parallele Plasmakathodenstreifen 9, und die Fontplatte 1 ist auf ihrer Rückseite mit spaltenleiterparallelen Phospfiorstreifen 10 sowie einer durchgehenden Nachbeschleunigungsanode 11 versehen. Die Steuerscheibe 3 wird gegen die Frontplatte 2 durch einen Abstandsrahmen 12 distanziert, der beidseitig jeweils durch eine Glaslotnaht 13, 14 vakuumdicht mit der Steuerscheibe bzw. der Frontplatte verbunden ist. Die Verbindung zwischen der Steuerscheibe und der Wanne wird über eine Glaslotnaht 15 hergestellt.The display shown contains a vacuum-tight, gas-filled envelope with a trough-like rear part 1 and a front plate 2 extending parallel to the trough bottom. The inside of the envelope is divided by a control plate 3 parallel to the front plate into a rear gas discharge space 4 and a front post-acceleration space 5. The control disk 3 carries row conductors (the plasma anode) 6 on its rear side and column conductors (the post-acceleration cathode) 7 running on its front side perpendicular to the row conductors 7. All conductors can be controlled individually; together they form a tax matrix. In each matrix element, the control structure formed from the control disk and the matrix conductors is provided with a passage opening 8. The tub base has on its front side several mutually parallel plasma cathode strips 9, and the back of the font plate 1 is provided with phosphor strips 10 parallel to the column conductors and a continuous post-acceleration anode 11. The control disk 3 is spaced from the front plate 2 by a spacer frame 12, which is connected on both sides in a vacuum-tight manner to the control disk or the front plate by a glass solder seam 13, 14. The connection between the control disc and the tub is made via a glass solder seam 15.

Der Rahmen ragt nach innen über die beiden Glaslotnähte 13, 14 hinaus und hat dort ein abgerundetes Profil mit rauher Oberfläche. Dieser Rahmen läßt sich folgendermaßen rationell herstellen : Zunächst schneidet man aus einer ca. 1,1 mm-dicken Weichglasscheibe mit einer Diamant-Trennscheibe ein Fenster heraus. Dann wird bei dem so erhaltenen Rahmen die Innenseite mit einer Strahltechnik abgerundet, mattiert und mit Cu belegt. Hierzu wird der Rahmen zunächst einige Sekunden lang mit bis zu 120 ktm-dicken A1203-Perlen gestrahlt und anschließend mit einem Strahl aus bis zu 60 µm dicken Glasperlen geläppt. Die Glasperlen sind dabei mit Cu überzogen. Anschließend spühlt man die behandelte Oberfläche ; ein spezieller Reinigungsprozeß ist nicht erforderlich.The frame projects inward beyond the two glass solder seams 13, 14 and has a rounded profile with a rough surface there. This frame can be produced rationally as follows: First, cut a window out of an approx. 1.1 mm thick soft glass pane with a diamond cutting disc. Then the inside of the frame thus obtained is rounded off with a blasting technique, matted and coated with Cu. For this purpose, the frame is first blasted with A1 2 0 3 beads up to 120 kt m thick and then lapped with a jet of glass beads up to 60 µm thick. The glass beads are covered with Cu. Then you rinse the treated surface; a special cleaning process is not necessary.

Einen Eindruck von der Struktur der rauhen Rahmenoberfläche vermitteln die Figuren 2 und 3. Sie sind aus Rasterelektronenmikroskopaufnahmen an einer Au-metallisierten Oberfläche hervorgegangen und zeigen die Fläche in einer 400- bzw. 2000-fachen Vergrößerung. Aus diesen Figuren läßt sich abschätzen, daß die Rauhtiefe dieses flachmuldigen Oberflächengebirges im Mittel zwischen 10 µm und 15 µm liegt und maximal 40 µm erreicht (DIN 4768, Blatt 1).Figures 2 and 3 give an impression of the structure of the rough frame surface. They have emerged from scanning electron microscope images on an Au-metallized surface and show the surface in a magnification of 400 or 2000 times. From these figures it can be estimated that the roughness of this shallow mountain range is on average between 10 µm and 15 µm and reaches a maximum of 40 µm (DIN 4768, sheet 1).

Alle übrigen Teile des Bildschirms sind an sich bekannt. Für weitere Herstellungs- und Betriebseinzelheiten wird auf Elektronik 14 (1982) 79 verwiesen.All other parts of the screen are known per se. For further manufacturing and operational details, please refer to Electronics 14 (1982) 79.

Die Erfindung beschränkt sich nicht nur auf das dargestellte Ausführungsbeispiel. Im vorliegenden Zusammenhang kommt es nur darauf an, die Nachbeschleunigungsstrecke kurzschlußfest zu machen. Insofern könnte man die Gasentladung auch in anderer Form - beispielsweise als stationäres Querplasma - erzeugen und/oder die Elektroden anders organisieren, etwa die gleichen Leiter als Plasmakathoden und als Zeilenleiter fungieren zu lassen oder mit einer Nachablenkung im Hochspannungsraum arbeiten. Davon abgesehen kommen auch andere Rahmenmaterialien und/oder andere Mattierungsmethoden in Frage ; denkbar wären etwa bestimmte Keramiken und spezielle Ätztechniken. Im übrigen bleibt es dem Fachmann unbenommen, in Fällen, in denen neben dem Abstandsrahmen noch weitere Distanzelemente vorgesehen sind, die Oberflächen dieser zusätzlichen Körper in gleicher Weise aufzurauhen.The invention is not limited to the illustrated embodiment. In the present context, it is only important to make the post-acceleration path short-circuit proof. In this respect, the gas discharge could also be generated in a different form - for example as a stationary transverse plasma - and / or the electrodes could be organized differently, for example to have the same conductors function as plasma cathodes and row conductors or to work with a deflection in the high-voltage room. That being said, other frame materials and / or other matting methods are also possible; Certain ceramics and special etching techniques would be conceivable. Otherwise, the person skilled in the art is at liberty to roughen the surfaces of these additional bodies in the same way in cases in which further spacer elements are provided in addition to the spacer frame.

Claims (14)

1. A gas-discharge display device comprising
a) a gas-filled, gas-tight casing which has two wall plates which are parallel to one another and lie one behind the other in the direction of observation and which consist of a rear plate (1) and a front plate (2),
b) a regularly perforated control structure (3) which is arranged in the casing and divides the inside of the casing into a rear space (4) and a front space (5), viz. into the gas discharge space (4) and the post-acceleration space (5) and comprises a plurality of electrode planes parallel to the plates,
c) at least one plasma cathode (9) and at least one plasma anode (6) in the gas discharge space (4), between which in the operating state a gas discharge burns and where electrons are drawn from this discharge into the post-acceleration space through selectively opened apertures of the control structure and accelerated to several kV in the post-acceleration space, which remains discharge-free,
d) a cathodoluminescent layer and an electrically conductive layer which is applied as a post-acceleration anode (11) at the rear of the front plate,
e) a post-acceleration cathode (7) which is spaced from the post-acceleration anode (11) by a spacing frame (12) and which is arranged in the post-acceleration space (5), characterised in that
f) at least on its inside, the spacing frame (12) has a rough surface, where rough means a deviation of shape of the fourth order and the rough surface has an averaged peak-to-valley height Rz, for which 1 µm < Rz < 100 µm is valid and the surface has a maximum peak-to-valley height .Rmax, for which Rmax ≤ 250 µm.
2. A device as claimed in Claim 1, characterised in that the rough surface has an averaged peak-to-valley height Rz, for which 4 µm ≤ Rz ≤ 40 µm is valid, and preferably has the shape of a flat trough.
3. A device as claimed in Claim 1 or Claim 2, characterised in that the rough surface has a maximum peak-to-valley height Rmax for which Rmax ≤ 100 µm is valid.
4. A device as claimed in one of Claims 1 to 3, characterised in that the rough surface is coated with island-shaped layers which are electrically insulated from one another and consist of an electrically conductive material.
5. A device as claimed in Claim 4, characterised in that the layers have a thickness d for which d ≤ 10-3 µm, in particular d = 6 - 10-4 µm, is valid.
6. A device as claimed in Claim 4 or Claim 5, characterised in that the layers have a surface mass b, for which b ≤ 0.8 µg · cm-2, in particular b ≤ 0.5 µg · cm-2, is valid.
7. A device as claimed in one of Claims 4 to 6, characterised in that the electrically conductive material is copper.
8. A device as claimed in one of Claims 1 to 7, comprising a spacing frame which protrudes freely into the post-acceleration space, characterised in that the transitions between the inside of the frame and the two end faces of the frame (12) are rounded-off and the frame surface is also rough in the rounded-off regions.
9. A device as claimed in one of Claims 1 to 8, characterised in that the spacing frame (12) consists of glass, in particular of a soft glass having a coefficient of thermal expansion a > 85 · 10-7 °K-1.
10. A process for the production of a spacing frame of a device as claimed in one of Claims 1 to 9, characterised in that the inside of the frame is rouhened by a jetting technique.
11. A process as claimed in Claim 10, characterised in that jet treatment is first effected by means of spheres of a diameter D and subsequently by means of spheres of a diameter D', where D' is smaller than D.
12. A process as claimed in Claim 11, characterised in that D ≤ 120 µm and D' ≤ 60 µm.
13. A process as claimed in one of Claims 10 to 12, characterised in that the spheres used for the jetting technique are coated with an electrically conductive material.
EP84108495A 1983-08-03 1984-07-18 Gas discharge display having a spacing frame Expired EP0133492B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84108495T ATE26627T1 (en) 1983-08-03 1984-07-18 GAS DISCHARGE INDICATOR WITH SPACER FRAME AND METHOD OF MAKING SUCH FRAME.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833328036 DE3328036A1 (en) 1983-08-03 1983-08-03 GAS DISCHARGE DISPLAY DEVICE WITH A SPACER FRAME AND METHOD FOR PRODUCING THIS FRAME
DE3328036 1983-08-03

Publications (3)

Publication Number Publication Date
EP0133492A2 EP0133492A2 (en) 1985-02-27
EP0133492A3 EP0133492A3 (en) 1985-04-10
EP0133492B1 true EP0133492B1 (en) 1987-04-15

Family

ID=6205680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108495A Expired EP0133492B1 (en) 1983-08-03 1984-07-18 Gas discharge display having a spacing frame

Country Status (5)

Country Link
US (1) US4659963A (en)
EP (1) EP0133492B1 (en)
JP (1) JPS60100339A (en)
AT (1) ATE26627T1 (en)
DE (2) DE3328036A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202553U (en) * 1985-06-05 1986-12-19
US4837685A (en) * 1987-02-18 1989-06-06 Myo-Tronics Research, Inc. Analog preprocessor for jaw tracking device
DE4003889A1 (en) * 1990-02-09 1991-08-14 Herbert Lacker Method of prodn. of matt surface on metal sheet - uses stream of glass beads generated by rotating impeller
KR930001176B1 (en) * 1990-11-02 1993-02-20 삼성전관 주식회사 Plasma display device
JPH053006A (en) * 1991-06-25 1993-01-08 Mitsubishi Electric Corp Light-emitting element
US5302881A (en) * 1992-06-08 1994-04-12 The United States Of America As Represented By The Secretary Of The Air Force High energy cathode device with elongated operating cycle time

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2135757A1 (en) * 1971-07-16 1973-02-01 Daimler Benz Ag METHOD FOR PROCESSING SURFACES
NL7512517A (en) * 1975-10-27 1977-04-29 Philips Nv METHOD OF MANUFACTURING A GAS DISCHARGE DISPLAY PANEL AND GAS DISCHARGE DISPLAY PANEL THEREFORE MANUFACTURED.
US4350924A (en) * 1978-10-18 1982-09-21 Hitachi, Ltd. Color picture tube
DE2952528C2 (en) * 1979-12-28 1985-10-10 Siemens AG, 1000 Berlin und 8000 München Gas discharge indicator

Also Published As

Publication number Publication date
EP0133492A2 (en) 1985-02-27
DE3328036A1 (en) 1985-02-14
DE3463199D1 (en) 1987-05-21
US4659963A (en) 1987-04-21
EP0133492A3 (en) 1985-04-10
JPS60100339A (en) 1985-06-04
ATE26627T1 (en) 1987-05-15

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