DE3611875A1 - Process for producing a multicolour visual display unit (VDU, screen) - Google Patents

Process for producing a multicolour visual display unit (VDU, screen)

Info

Publication number
DE3611875A1
DE3611875A1 DE19863611875 DE3611875A DE3611875A1 DE 3611875 A1 DE3611875 A1 DE 3611875A1 DE 19863611875 DE19863611875 DE 19863611875 DE 3611875 A DE3611875 A DE 3611875A DE 3611875 A1 DE3611875 A1 DE 3611875A1
Authority
DE
Germany
Prior art keywords
phosphor
screen
producing
vdu
multicolour
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Withdrawn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
DE19863611875
Other languages
German (de)
Inventor
Kanagaratnam Anandasivam
Klaus Gerland
Rolf Griessmayr
Irene Kienle
Ulrich Kube
Hermann Dr Widmann
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19863611875 priority Critical patent/DE3611875A1/en
Publication of DE3611875A1 publication Critical patent/DE3611875A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/22—Luminescent screens characterised by the binder or adhesive for securing the luminescent material to its support, e.g. vessel
    • 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
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
    • H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
    • H01J9/2271—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines by photographic processes

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Abstract

To improve the adhesion of photochemically produced phosphors (luminescent materials), it is proposed that a prepolymerised acrylate be added to the light-sensitive phosphor suspension.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen eines Mehrfarben-Leuchtschirms nach dem Oberbegriff des Patentanspruches 1.The present invention relates to a method for Manufacture of a multi-color fluorescent screen according to the Preamble of claim 1.

Leuchtschirme für Farbbildkathodenstrahlröhren werden in bekannter Weise nach einem photochemischen Verfahren hergestellt. Hierbei wird durch eine Maskenvorlage eine Leuchtstoffschicht, die bevorzugt Polyvinylalkohol als Bindemittel und einen Sensibilisator, wie Ammoniumdi­ chromat oder eine Diazoniumverbindung enthält, mit langwelligem UV-Licht belichtet. Die Leuchtstoffschicht wird aus einer Suspension aufgebracht. An den von dem Licht getroffenen Stellen erfolgt eine Gärbung, wäh­ rend die nicht vom Licht getroffenen Stellen wasser­ löslich bleiben. Bei einem anschließenden sogenannten Entwicklungsprozeß werden die stärker löslichen, also die nicht vom UV-Licht getroffenen Stellen mit Wasser ausgewaschen. Fluorescent screens for color cathode ray tubes in a known manner by a photochemical process produced. Here, a mask template is used Fluorescent layer, which is preferred as polyvinyl alcohol Binders and a sensitizer such as ammonium di contains chromate or a diazonium compound, with exposed to long-wave UV light. The phosphor layer is applied from a suspension. To that one Areas of light are colored, wah water that has not been hit by the light remain soluble. In a subsequent so-called Development process will be the more soluble, so the areas not hit by UV light with water washed out.  

Ein Problem besteht darin, daß die zurückbleibenden Leuchtstoffflächenteile, im allgemeinen Punkte oder Linien, an der Glasoberfläche des Leuchtstoffträgers genügend stark haften müssen. Diese Haftung ist jedoch häufig unzureichend, was zur Folge hat, daß bei der Entfernung der nicht vom UV-Licht getroffenen Stellen, dem sogenannten Auswaschen, sehr vorsichtig vorgegangen werden muß. Als nachteilige Folge davon ergibt sich, daß die jeweils zuvor aufgebrachten Leuchtstoffraster, durch die nachfolgend aufgebrachten Leuchtstoffe ver­ hältnismäßig stark verunreinigt werden, was zu einer unsauberen Farbwiedergabe der fertigen Röhre führt.One problem is that the lagging Fluorescent surface parts, generally points or Lines on the glass surface of the fluorescent substrate must adhere sufficiently strongly. However, this liability is often inadequate, which means that the Removal of areas not hit by UV light, the so-called washing out, proceeded very carefully must become. The disadvantageous consequence of this is that that the previously applied fluorescent grid, by the phosphors applied below be relatively heavily contaminated, resulting in a leads to dirty color rendering of the finished tube.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Haftung der aufgebrachten Leuchtstoffelemente an der Leuchtschirmträgeroberfläche zu verbessern.The present invention is based on the object the liability of the applied fluorescent elements to improve the surface of the phosphor screen.

Diese Aufgabe wird durch die im Kennzeichen des Pa­ tentanspruches 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of Pa tent Claim 1 .

Die vorgesehene Zugabe vorpolymerisiertem Acrylat führt dazu, daß die jeweils aufgebrachten Leuchtstoffraster wesentlich besser an der insbesondere aus Glas beste­ henden Leuchtschirmträgerfläche haften. Infolgedessen kann die Auswaschung der nicht belichteten Leuchtstoff­ teile unter physikalisch verstärkten Bedingungen vor­ genommen werden, z. B. indem man das Waschwasser unter stärkerem Druck aufsprüht.The proposed addition of prepolymerized acrylate leads to the fact that the respective applied phosphor grid much better at the best, especially made of glass stick to the fluorescent screen support surface. Consequently can wash out the unexposed phosphor Advance under physically enhanced conditions be taken, e.g. B. by taking the wash water under sprayed stronger pressure.

Gemäß einem bevorzugten Ausführungsbeispiel wird eine Leuchtstoffsuspension hergestellt, die den Leuchtstoff, Polyvinylalkohohl als Bindemittel und einen Sensibili­ sator, wie Ammoniumdichromat oder eine Diazoniumver­ bindung enthält. Dieser wässerigen Suspension wird gemäß der Erfindung ein vorpolymerisiertes Acrylat, wie sie z. B. unter dem handelsüblichen Namen Acronal, Plextol oder Rhople bekannt sind, zugemischt. Der Zumischungsanteil beträgt etwa 0,01 bis zu insbesondere etwa 0,1 Gewichtsprozente. Diese Suspension wird in bekannter Weise auf die Glasoberfläche des Leuchtschirm­ trägers aufgebracht und angetrocknet, dann durch eine Maskenvorlage hindurch belichtet und dann nach Entfer­ nen der Maskenvorlage mit unter Druck aufgesprühtem Wasser entwickelt.According to a preferred embodiment, a Fluorescent suspension produced which the phosphor, Polyvinyl alcohol as a binder and a sensi sator, such as ammonium dichromate or a diazonium ver binding contains. This aqueous suspension will  according to the invention a prepolymerized acrylate, such as they z. B. under the commercial name Acronal, Plextol or Rhople are known. The The proportion of admixture is about 0.01 up to in particular about 0.1 percent by weight. This suspension is in known way on the glass surface of the fluorescent screen applied and dried, then by a Exposed mask template and then by distance the mask template with sprayed on under pressure Water developed.

Claims (4)

1. Verfahren zum Herstellen eines Mehrfarben-Leucht­ schirms für Kathodenstrahlröhren, bei dem auf einen Leuchtstoffträger mittels einer, einen Leuchtstoff, ein Bindemittel und einen Sensibilisator enthaltenden wässerigen Suspension eine Leuchtstoffschicht aufge­ bracht, durch eine Maskenvorlage hindurch belichtet und damit in seiner Löslichkeit verändert wird, und dann die stärker löslichen Schichtteile ausgewaschen werden, dadurch gekennzeichnet, daß der Leuchtstoffsuspension ein bereits vorpolymerisiertes Acrylat als Haftver­ besserer zugesetzt wird.1. A method for producing a multicolor phosphor screen for cathode ray tubes, in which a phosphor layer is applied to a phosphor carrier by means of an aqueous suspension containing a phosphor, a binder and a sensitizer, exposed through a mask template and thus its solubility is changed, and then the more soluble layer parts are washed out, characterized in that an already prepolymerized acrylate is added as an adhesion promoter to the phosphor suspension. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Auswaschen mittels unter Druck aufgesprühten Wassers erfolgt.2. The method according to claim 1, characterized in that that the washout by means of sprayed on under pressure Water takes place. 3. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß als Bindemittel Polyvinylalkohol verwendet wird. 3. The method according to claim 1 or claim 2, characterized characterized in that as a binder polyvinyl alcohol is used.   4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß als Sensibilisator Ammoniumdichro­ mat oder eine Diazoniumverbindung verwendet wird.4. The method according to any one of claims 1 to 3, characterized characterized in that as a sensitizer ammonium dichro mat or a diazonium compound is used.
DE19863611875 1986-04-09 1986-04-09 Process for producing a multicolour visual display unit (VDU, screen) Withdrawn DE3611875A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863611875 DE3611875A1 (en) 1986-04-09 1986-04-09 Process for producing a multicolour visual display unit (VDU, screen)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863611875 DE3611875A1 (en) 1986-04-09 1986-04-09 Process for producing a multicolour visual display unit (VDU, screen)

Publications (1)

Publication Number Publication Date
DE3611875A1 true DE3611875A1 (en) 1987-10-22

Family

ID=6298276

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863611875 Withdrawn DE3611875A1 (en) 1986-04-09 1986-04-09 Process for producing a multicolour visual display unit (VDU, screen)

Country Status (1)

Country Link
DE (1) DE3611875A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718866A3 (en) * 1994-12-19 1997-05-02 Toshiba Kk Method of manufacturing display screen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718866A3 (en) * 1994-12-19 1997-05-02 Toshiba Kk Method of manufacturing display screen
US5885752A (en) * 1994-12-19 1999-03-23 Kabushiki Kaisha Toshiba Method of manufacturing display screen

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