EP0155895B1 - Verfahren zur Herstellung flacher Bildwiedergabeschirme und nach diesem Verfahren hergestellte Schirme - Google Patents

Verfahren zur Herstellung flacher Bildwiedergabeschirme und nach diesem Verfahren hergestellte Schirme Download PDF

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Publication number
EP0155895B1
EP0155895B1 EP85430005A EP85430005A EP0155895B1 EP 0155895 B1 EP0155895 B1 EP 0155895B1 EP 85430005 A EP85430005 A EP 85430005A EP 85430005 A EP85430005 A EP 85430005A EP 0155895 B1 EP0155895 B1 EP 0155895B1
Authority
EP
European Patent Office
Prior art keywords
screen
tips
screens
tip
electrons
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
Application number
EP85430005A
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English (en)
French (fr)
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EP0155895B2 (de
EP0155895A1 (de
Inventor
Jean-Paul Biberian
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
LABORATOIRE D'ETUDE DES SURFACES A RESPONSABILITE DITE Ltee Ste
Biberian Jean-Paul
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Application filed by LABORATOIRE D'ETUDE DES SURFACES A RESPONSABILITE DITE Ltee Ste, Biberian Jean-Paul filed Critical LABORATOIRE D'ETUDE DES SURFACES A RESPONSABILITE DITE Ltee Ste
Priority to AT85430005T priority Critical patent/ATE44114T1/de
Publication of EP0155895A1 publication Critical patent/EP0155895A1/de
Publication of EP0155895B1 publication Critical patent/EP0155895B1/de
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Publication of EP0155895B2 publication Critical patent/EP0155895B2/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 conventional television tube with scanning of the electron beam cannot be reduced in thickness for physical reasons: distortion of the image if the beam arrives too grazing on the screen, and lack of precision to reach the masks on the screen in the case of color. Furthermore, the dimensions of the screen cannot be thoughtlessly increased for reasons of vacuum and therefore of resistance of the materials to pressure.
  • liquid crystals are attractive because they have a very low power consumption, but they do require an external source of light to be visible. In addition, it is very difficult to make grayscale gradations, and to produce color images.
  • the invention also relates to flat display screens obtained by implementing the above method.
  • the basic principle of the invention shown diagrammatically in FIG. 1, consists essentially in using as field source microtips as the electron source.
  • a field emission tip such as 1, having a radius of curvature of a few hundred Angstroms, emits electrons e simply by applying an electric field between the tip 1 and a fluorescent screen 2 thanks to the potential E.
  • a simple solution for manufacturing a flat display screen in accordance with the invention consists, as shown diagrammatically in FIG. 2, of connecting: on the one hand, the tips in lines, for example the tips 1 A1 ' 1 81 , 1 c1 ... along line L A1 ; points 1A2 '1 82 , 1 c2 ... along line L A2 ; points 1q 3 , 1 B3 , 1 C3 ... along the line L A3 etc ...; on the other hand, the screens in columns 2A, 2 8 , 2 c ...
  • This arrangement makes it possible by matrixing and row-column addressing, successive light points to be emitted on the screen.
  • the tips can be produced by deposition or etching techniques using the conventional methods of microelectronics, that is to say masking and then wet etching in acid baths or dry etching by plasma or particle beam.
  • the different columns of the screen are made of transparent material, for example glass, covered with a metallic film and a fluorescent material.
  • each light point In order to eliminate the problem of manufacturing a large number of microtips having very close radii of curvature, and also to overcome the possible failure of one of these points, it is advantageous to constitute each light point by a set of several microtips.
  • the type of screen configuration according to the invention that has just been described is of the diode type, and constitutes the simplest solution from the conceptual point of view, but problems appear at the level of the control voltages.
  • the point-screen distance must be of the order of a few microns, which obviously creates technical manufacturing problems.
  • FIG. 3 A solution, both more advanced and simpler, of the invention facilitating the problems of rapid switching and making it possible to considerably reduce the technical problems which have just been mentioned above, is shown diagrammatically in FIG. 3.
  • This solution essentially consists in using a triode type assembly with a control grid 3 which makes it possible to modulate the electric intensity.
  • the invention makes it possible to solve the above problem in a simple and effective manner by adopting the tetrode type arrangement shown diagrammatically in FIGS. 5 and 6.
  • This arrangement comprises, as in the previous cases, for each unit light point, a field emission tip 1, a fluorescent screen 2, a first extraction grid 3, a second extraction grid 4.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Auxiliary Devices For Music (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Farming Of Fish And Shellfish (AREA)

Claims (10)

1. Verfahren zur Realisierung flacher Bildschirme des Typs, bei dem Bilder auf einem Leuchtschirm durch eine zeilen-spaltenweise adressierte Punkt-Matrix erzeugt werden, mit den folgenden Schritten:
- dass als Elektronenquelle Feldemissions-Mikrospitzen verwendet werden;
- dass einerseits die Spitzen in Zeilen und anderseits die Leuchtschirme in Spalten verbunden werden;
- dass ein elektrisches Feld nacheinander zwischen jeder der Spitzen und dem ihr entsprechenden Schirm angelegt wird, so dass die in Betracht kommende Spitze Elektronen aussendet und auf dem Schirm einen Leuchtpunkt bildet, dessen Intensität von der angelegten, das Austreten der Elektronen hervorrufenden Spannung abhängt, welches Verfahren dadurch gekennzeichnet ist, dass gleichzeitig alle anderen Spitzen durch Aufbringen einer negativen Spannung an den anderen, nicht an der Elektronenemission beteiligten Spalten gesperrt werden;
- und dies durch aufeinanderfolgende Umschaltungen so weitergeführt wird, um auf dem Bildschirm aufeinanderfolgende Leuchtpunkte zu erhalten, die jenen der Matrix entsprechen.
2. Verfahren nach Anspruch 1, dadurch gekennezeichnet, dass man zwischen jeder Spitze und dem entsprechenden Schirm ein Gitter für das Austreten der Elektronen vorsieht, das es erlaubt, sowohl die Intensität der emittierten Elektronen als auch die Energie der den Schirm erreichenden Elektronen zu modulieren.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass man das Matrizieren eine der drei möglichen Kombinationen: Spitze-Gitter, Spitze-Schirm, oder Gitter-Schirm wählt, wobei in jedem Fall die dritte Komponente dann auf ein festes Potential gesetzt wird.
4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zum Trennen der Adressier-und der Leuchtstärkemodulations-Funktionen eine zeilenspaltenweise Adressierung für die Spitzen und die Schirme, jedoch ohne Modulation der Werte der angelegten Spannungen, vorgenommen wird, und alle Gitter unter Modulation der angelegten Spannung miteinander verbunden werden, um die Leuchtstärke zu variieren.
5. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zum Trennen der Adressier-und der Leuchtstärkemodulations-Funktionen eine zeilenspaltenweise Adressierung für die Gitter und die Schirme, jedoch ohne Modulation der Werte der angelegten Spannungen, vorgenommen wird, und alle Spitzen unter Modulation der angelegten Spannung miteinander verbunden werden, um die Leuchtstärke zu variieren.
6. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zum Trennen der Adressier-und der Leuchtstärkemodulations-Funktionen eine zeilenspaltenweise Adressierung für die Spitzen und die Gitter, jedoch ohne Modulation der Werte der angelegten Spannungen, vorgenommen wird, und alle Schirme unter Modulation der angelegten Spannung miteinander verbunden werden, um die Leuchtstärke zu variieren.
7. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass man zwischen jeder Spitze und dem entsprechenden Schirm ein erstes Gitter für das Austreten der Elektronen und dann ein zweites Gitter für das Austreten dieser Elektronen vorsieht, während alle Spitzen und alle Schirme jeweils miteinander verbunden sind, wodurch die Zeilen-Spalten-Adressierung durch die an das erste bzw. das zweite Gitter angelegten Spannungen erfolgt, wobei die Änderung der Leuchtstärke durch die Modulation der zwischen Spitze und Schirm angelegten Spannung erreicht wird.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass jeder Lichtpunkt auf dem Schirm durch eine Gruppe mehrerer Mikrospitzen erzeugt wird, wobei die Anzahl der Mikrospitzen pro Grundlichtpunkt an die Hundert erreichen kann.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass zur Verwirklichung von Farbe die Zeilen oder Spalten verdreifacht werden und Leuchtmaterialien verschiedener Farben, vorzugsweise Rot, Grün und Blau, in Tripelanordnung auf dem Schirm für jeden Grundleuchtpunkt vorgesehen werden.
10. Die nach den Ansprüchen 1 bis 9 realisierten flachen Bildschirme als neue Industrieprodukte.
EP85430005A 1984-03-09 1985-03-05 Verfahren zur Herstellung flacher Bildwiedergabeschirme und nach diesem Verfahren hergestellte Schirme Expired - Lifetime EP0155895B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85430005T ATE44114T1 (de) 1984-03-09 1985-03-05 Verfahren zur herstellung flacher bildwiedergabeschirme und nach diesem verfahren hergestellte schirme.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8403877 1984-03-09
FR8403877A FR2561019B1 (fr) 1984-03-09 1984-03-09 Procede de realisation d'ecrans de visualisation plats et ecrans plats obtenus par la mise en oeuvre dudit procede

Publications (3)

Publication Number Publication Date
EP0155895A1 EP0155895A1 (de) 1985-09-25
EP0155895B1 true EP0155895B1 (de) 1989-06-14
EP0155895B2 EP0155895B2 (de) 1993-09-22

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EP85430005A Expired - Lifetime EP0155895B2 (de) 1984-03-09 1985-03-05 Verfahren zur Herstellung flacher Bildwiedergabeschirme und nach diesem Verfahren hergestellte Schirme

Country Status (6)

Country Link
US (1) US4763187B1 (de)
EP (1) EP0155895B2 (de)
JP (1) JP2711834B2 (de)
AT (1) ATE44114T1 (de)
DE (1) DE3571099D1 (de)
FR (1) FR2561019B1 (de)

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Also Published As

Publication number Publication date
US4763187B1 (en) 1997-11-04
US4763187A (en) 1988-08-09
DE3571099D1 (en) 1989-07-20
JP2711834B2 (ja) 1998-02-10
EP0155895B2 (de) 1993-09-22
EP0155895A1 (de) 1985-09-25
FR2561019B1 (fr) 1987-07-17
ATE44114T1 (de) 1989-06-15
FR2561019A1 (fr) 1985-09-13
JPS6123479A (ja) 1986-01-31

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