EP0192301B1 - Verfahren zur Herstellung eines anhaftenden Partikelmusters von einer Substanz auf ein Substrat, Verfahren zur Herstellung eines Anzeigevorrichtungschirms von einem farbigen Anzeigebildrohr und ein farbiges Anzeigebildrohr mit einem mit diesem Verfahren hergestellten Anzeigeschirm - Google Patents

Verfahren zur Herstellung eines anhaftenden Partikelmusters von einer Substanz auf ein Substrat, Verfahren zur Herstellung eines Anzeigevorrichtungschirms von einem farbigen Anzeigebildrohr und ein farbiges Anzeigebildrohr mit einem mit diesem Verfahren hergestellten Anzeigeschirm Download PDF

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Publication number
EP0192301B1
EP0192301B1 EP19860200215 EP86200215A EP0192301B1 EP 0192301 B1 EP0192301 B1 EP 0192301B1 EP 19860200215 EP19860200215 EP 19860200215 EP 86200215 A EP86200215 A EP 86200215A EP 0192301 B1 EP0192301 B1 EP 0192301B1
Authority
EP
European Patent Office
Prior art keywords
particles
substrate
substance
pattern
layer
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
EP19860200215
Other languages
English (en)
French (fr)
Other versions
EP0192301A2 (de
EP0192301A3 (en
Inventor
Henry Dermott Stone
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.)
Koninklijke Philips NV
Original Assignee
Philips Electronic and Associated Industries Ltd
Philips Electronics UK Ltd
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Electronic and Associated Industries Ltd, Philips Electronics UK Ltd, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Electronic and Associated Industries Ltd
Publication of EP0192301A2 publication Critical patent/EP0192301A2/de
Publication of EP0192301A3 publication Critical patent/EP0192301A3/en
Application granted granted Critical
Publication of EP0192301B1 publication Critical patent/EP0192301B1/de
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a method of manufacturing an adherent pattern of particles of a substance on a substrate. Such a method may be used to manufacture a display screen of a colour display picture tube. The invention also relates to a colour display picture tube having a display screen manufactured by such a method.
  • the display screens of colour display picture tubes have been made by a complicated process in which a dispersion of a green-luminescing phosphor in a solution of polyvinyl alcohol and ammonium dichromate is used to produce a coating on the face-plate.
  • This coating is dried and exposed to ultra-violet light through the apertures of a shadow mask.
  • the irradiated coating is then washed with water to remove the unexposed areas of the coating.
  • This procedure is then repeated twice, in order to form a blue- luminescing phosphor pattern and then a red-luminescing phosphor pattern. This process is expensive and slow.
  • the patterns of phosphor elements may be made by a method using a photosensitive composition which becomes sticky upon exposure to light, which method is simpler and is significantly faster than the above-mentioned method using polyvinyl alcohol and ammonium dichromate.
  • United States Patent Specification 4,273,842 describes a process for forming a patternwise coated layer on a phosphor screen of a colour picture tube, which comprises:
  • a display screen of a conventional colour display picture tube was produced by a process using a layer of a photosensitive composition which on patternwise exposure to light became sticky so that phosphor particles applied to the layer adhered the sticky areas of the layer. It was found that when using this process, it was necessary to bake the display screen for 3s hours at 450°C in order to remove the binder, and even after this baking process, a residue.was left on the display screen.
  • Our United Kingdom Patent Specification 1,598,888 describes an electron display tube having an envelope comprising a flat, glass face- plate which is sealed in a vacuum-tight manner to a flange of a metal cone by means of a pressure- bonded seal consisting of a pressure-deformable material, such as lead. It is preferred to use a face- plate which comprises thermally toughened glass, for reasons of cost. However, when a toughened glass face-plate is baked at temperatures above 320°C, the glass tends to detoughen, and is not then satisfactory for use in an electron display tube, for safety reasons.
  • An object of the invention is to provide a method of making a display screen of a colour display picture tube, in which method the patterns of phosphor elements are formed using a photosensitive composition which becomes sticky upon exposure to light, and the photosensitive composition is removed from the display screen by a process which is substantially shorter than the above-mentioned baking process and which is conducted at a temperature which is significantly lower than 300°C, so that a face-plate consisting of toughened glass would not be detoughened when subjected to this process.
  • the invention provides a method of manufacturing an adherent pattern of particles of a substance on a substrate, the method comprising the steps of providing a layer of a radiation-sensitive composition on the substrate, imagewise irradiating the radiation-sensitive composition layer providing a pattern of particles of the substance on the irradiated radiation-sensitive composition layer, removing the irradiated radiation-sensitive composition layer from the substrate while leaving the pattern of the particles of the substance on the substrate by condensing vapour of an organic solvent on the pattern of particles of the substance and the irradiated radiation-sensitive composition layer, continuing condensation of the solvent vapour until pure solvent falls off the substrate, in which solvent both the radiation-sensitive composition which has reacted as a result of irradiation and the unreacted radiation-sensitive composition are soluble and the substance is insoluble, the substrate being disposed during condensation of the vapour so that the condensate falls off the substrate, and then fixing the pattern of the particles to the substrate.
  • the vapour of the organic solvent is initially supplied to the irradiated radiation-sensitive composition layer and the pattern of particles of the substance at a first rate, and the rate of supply of the vapour of the solvent is subsequently increased.
  • the rate of supply of solvent vapour to the condensation surfaces By changing the rate of supply of solvent vapour to the condensation surfaces, the time taken to completely remove the binder-comprising layer can be less than that needed when solvent vapour is supplied to the condensation surfaces at a constant rate. It was found during the investigations which led to the present invention that in order to avoid disturbance of the pattern of the particles of the substance, the initial rate of supply of solvent vapour must be less than the rate at which solvent vapour could be supplied to the condensation surfaces without disturbing the pattern of particles when all the material of the irradiated radiation-sensitive composition layer had been removed from the substrate.
  • the particles of the substance are only weakly held to the substrate.
  • the particles of the substance may be fixed to the substrate, for example, by means of an inorganic binder such as potassium metasilicate or a silica sol.
  • the substrate When the substrate is a substantially flat substrate, it is preferred that the substrate should be inclined to the horizontal during the removal of the material of the irradiated radiation-sensitive composition layer from the substrate, in order that the condensate should run over part of the layer material before falling off the layer, thereby enhancing the efficiency of dissolution of the layer material by the condensate.
  • the radiation-sensitive composition may comprise, for example, a photosensitive composition which becomes sticky upon exposure to light, and the pattern of particles of the substance is provided on the photosensitive composition layer by exposing the layer to light in accordance with the pattern so as to make the exposed portions of the layer sticky, then contacting the exposed layer with particles of the substance and removing the non-adhering particles.
  • a method may be used to manufacture a display screen of a colour display picture tube, in which method patterns of respective phosphor elements are provided on the photosensitive composition layer by successively making respective patterns of the photosensitive composition layer sticky as a result of exposure to light, contacting the exposed photosensitive composition layer with particles of a respective phosphor, and removing the non-adhering particles of the respective phosphor.
  • portions of the photosensitive composition layer corresponding to the matrix pattern are made sticky as a result of exposure to light, the layer is contacted with particles of the light-absorbing substance, and the non-adhering particles of the light-absorbing substance are removed.
  • the displsy screen may be, for example, a face-plate.
  • the phosphor elements may, for example, be in the form of dots or stripes.
  • the irradiated photosensitive composition prefferably to be removed from the display screen surface by passing the display screen over a bath of the boiling solvent and increasing the rate of condensation of the solvent on the display screen surface by reducing the height of the display screen above the surface of the liquid solvent as the display screen traverses the said bath.
  • a 2 pm thick photosensitive layer 1 was formed on a colour picture display tube flat face-plate 2 (which was 35 cm square) by spraying the face-plate 2 with a solution of a photosensitive composition which becomes sticky upon exposure to ultraviolet light, and allowing the layer 1 to dry in air.
  • the photosensitive composition layer 1 was exposed through a mask 3 to 365 nm light from a 125 watt HPR lamp 4 for 12 minutes so as to make exposed areas 5 (Fig. 2) sticky at areas where a first black matrix film pattern consisting of particles of cobalt oxide was to be disposed on the face-plate 2.
  • the layer 1 was then dusted with cobalt oxide particles and the non-adhering particles (both those disposed on the non-sticky areas of the layer 1 and those resting on cobalt oxide particles adhering to the sticky areas of the layer 1) were removed by blowing with an air jet, leaving a black matrix film pattern 6.
  • the photosensitive composition layer 1 was then exposed to light from the lamp 4 for 11 ⁇ 2 minutes so as to make exposed areas 7 ( Figure 3) sticky where elements of a green-luminescing phosphor were to be disposed.
  • the photosensitive composition layer 1 was dusted with particles of the green-luminescing phosphor and the non-adhering phosphor particles were removed by blowing with an air jet, leaving green-luminescing elements 8.
  • a glass cylinder 11 was placed in a beaker 12 containing methyl ethyl ketone 13 which was a solvent for both the photosensitive composition material which had reacted due to exposure to light and the unreacted material, but in which the cobalt oxide and each of the phosphors were insoluble.
  • the cylinder 11 was provided at the lower end with two cut-outs 14 (only one of which is shown), the horizontal boundaries of which were above the level of the liquid 13 in the beaker 12 so as to avoid bumping of the liquid 13 when it boiled, and at the upper end with three fingers 15 (only two of which are shown) which supported a face-plate 16 which had been provided with a display screen structure 17 by the method described above with reference to Figures 1 to 5.
  • the cylinder 11 also served to establish a concentration gradient of methyl ethyl ketone vapour between the surface of the liquid methyl ethyl ketone 13 and the display screen structure 17.
  • the beaker 12 was heated by means of an electric hot-plate 18 which was tilted slightly so that the major surfaces of the face-plate 16 were inclined to the horizontal with the consequence that drops of liquid formed from the methyl ethyl ketone condensing on the display screen structure 17 flowed over the surface of the structure 17 before falling off the face-plate 16 into the liquid methyl ethyl ketone 13.
  • the energy input supplied to the hot-plate 18 was adjusted so that the temperature of the methyl ethyl ketone vapour in contact with the display screen structure was 30°C. This resulted in methyl ethyl ketone condensing at a low rate and forming liquid droplets on the display screen structure, which droplets coalesced to form drops which ran over the face-plate 16 surface and fell into the methyl ethyl ketone liquid 13. After condensation at this low rate for 2 minutes, the heat input to the hot-plate 18 was then increased so that in the course of 3 minutes the temperature of the methyl ethyl ketone vapour in contact with the display screen structure rose to 50°C.
  • the black matrix film pattern and the patterns of phosphor elements were bonded to the face-plate 16 by carefully applying a solution of silica sol in ethyl alcohol (approximately 1 to 2% by volume) over the display screen surface until the patterns were completely wetted, allowing the screen to dry in air, then heating the screen to 120°C. Further fixing can then be provided in a conventional way using potassium metasilicate by spraying an aqueous solution of potassium metasilicate on to the display screen surface, allowing the solution to dry and then baking the display screen around 150°C. The display screen was then completed by lacquering and aluminising.
  • the display screen was then built into a colour picture display tube with a cone portion, electron gun system and other circuit components.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)

Claims (10)

1. Verfahren zur Herstellung eines anhaftenden Partikelmusters einer Substanz auf einem Substrat, wobei dieses Verfahren Schritte zum Anbringen einer Schicht mit einer strahlungsempfindlichen Zusammensetzung auf dem Substrat, zum bildweisen Anstrahlen der strahlungsempfindlichen Schicht, zum Anbringen eines Partikelmusters der Substanz auf der angestrahlten strahlungsempfindlichen Schicht, zum Entfernen der angestrahlten strahlungsempfindlichen Schicht vom Substrat unter Zurücklassung des Partikelmusters der Substanz auf dem Substrat durch Kondensation des Dampfes eines organischen Lösungsmittels auf dem Partikelmuster der Substanz und auf der angestrahlten strahlungsempfindlichen Schicht, wobei in diesem Lösungsmittel sowohl die strahlungsempfindliche Zusammensetzung, die auf die Anstrahlung reagierte, als auch die nicht reagierte strahlungsempfindliche Zusammensetzung löslich sind und die Substanz unlöslich ist, wobei die Kondensation des Lösungsdampfes weitergeht, bis reines Lösungsmittel vom Substrat abfällt, wobei das Substrat beim Kondensieren des Dampfes derart angeordnet wird, daß das Kondensat vom Substrat abfällt, und letztlich zum Befestigen des Partikelmusters auf dem Substrat umfaßt.
2. Verfahren nach Anspruch 1, wobei der Dampf des organischen Lösungsmittels zunächst der strahlungsempfindlichen Schicht und dem Partikelmuster der Substanz mit einer ersten Geschwindigkeit zugeleitet wird, und die Zuleitungsgeschwindigkeit des Dampfes des Lösungsmittels danach erhöht wird.
3. Verfahren nach Anspruch 1 oder 2, wobei das Partikelmuster der Substanz mittels eines anorganischen Bindemittels auf dem Substrat fixiert wird.
4. Verfahren nach einem der vorangehenden Ansprüche, wobei das Substrat ein im wesentlichen flaches Substrat ist, das beim Entfernen der strahlungsempfindlichen Schicht vom Substrat einen Winkel mit der Horizontale einschließt.
5. Verfahren nach einem der vorangehenden Ansprüche, wobei die strahlungsempfindliche Zusammensetzung eine photoempfindliche Zusammensetzung ist, die bei Anstrahlung mit Licht klebrig wird, und das Partikelmuster der Substanz durch Anstrahlung der Schicht mit Licht entsprechend dem Muster auf der photoempfindlichen Schicht angebracht wird, um die angestrahlten Schichtteile klebrig zu machen, darauf die Schicht mit Partikeln der Substanz in Kontakt zu bringen und danach die nicht haftenden Partikeln zu entfernen.
6. Verfahren nach Anspruch 5 zur Herstellung eines Wiedergabeschirms einer Farbbild-Wiedergaberöhre, wobei Muster jeweiliger Leuchtstoffelemente auf der Photoempfindlichen Schicht dadurch angebracht werden, daß aufeinanderfolgend jeweilige Muster der photoempfindlichen Schicht zufolge der Anstrahlung mit Licht klebrig gemacht werden, die angestrahlte photoempfindliche Schicht mit Partikeln eines jeweiligen Leuchtstoffes in Kontakt gebracht werden und die nicht haftenden Partikeln des betreffenden Leuchtsoffs entfernt werden.
7. Verfahren nach Anspruch 6, wobei ein Partikelmuster eines schwarzen Matrixfilms einer Licht absorbierenden Substanz auf der photoempfindlichen Schicht dadurch angebracht wird, daß Schichtteile entsprechend dem Matrixmuster durch Anstrahlung mit Licht klebrig gemacht werden, die angestrahlte Schicht mit Partikeln der Licht absorbierenden Substanz in Kontakt gebracht wird und die nicht haftenden Partikeln der Licht absorbierenden Substanz entfernt werden.
8. Verfahren nach Anspruch 6 oder 7, wobei das Substrat eine Bildröhren-Frontplatte ist.
9. Verfahren nach Anspruch 9, wobei die Frontplatte thermisch gehärtetes Glas enthält.
10. Farbbild-Wiedergaberöhre mit einem Wiedergabeschirm, der mit dem Verfahren nach einem der Ansprüche 6 bis 10 hergestellt wurde.
EP19860200215 1985-02-18 1986-02-17 Verfahren zur Herstellung eines anhaftenden Partikelmusters von einer Substanz auf ein Substrat, Verfahren zur Herstellung eines Anzeigevorrichtungschirms von einem farbigen Anzeigebildrohr und ein farbiges Anzeigebildrohr mit einem mit diesem Verfahren hergestellten Anzeigeschirm Expired EP0192301B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08504055A GB2171529A (en) 1985-02-18 1985-02-18 Method of manufacturing an adherent pattern of particles of a substance on a substrate method of manufacturing a display screen of a colour display picture tube and a colour display picture tube having a display screen manufactured by the method
GB8504055 1985-02-18

Publications (3)

Publication Number Publication Date
EP0192301A2 EP0192301A2 (de) 1986-08-27
EP0192301A3 EP0192301A3 (en) 1988-01-27
EP0192301B1 true EP0192301B1 (de) 1990-06-27

Family

ID=10574630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860200215 Expired EP0192301B1 (de) 1985-02-18 1986-02-17 Verfahren zur Herstellung eines anhaftenden Partikelmusters von einer Substanz auf ein Substrat, Verfahren zur Herstellung eines Anzeigevorrichtungschirms von einem farbigen Anzeigebildrohr und ein farbiges Anzeigebildrohr mit einem mit diesem Verfahren hergestellten Anzeigeschirm

Country Status (4)

Country Link
EP (1) EP0192301B1 (de)
JP (1) JPH0664994B2 (de)
DE (1) DE3672328D1 (de)
GB (1) GB2171529A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843157C1 (de) * 1988-12-22 1990-05-10 Du Pont De Nemours (Deutschland) Gmbh, 6380 Bad Homburg, De
DE4113483C2 (de) * 1990-05-12 1995-10-26 Du Pont Deutschland Verfahren zur Erzeugung feiner Leiterbahnen auf einem keramischen Träger
NL9001530A (nl) * 1990-07-05 1992-02-03 Philips Nv Werkwijze voor het vormen van een patroon op een substraat, werkwijze voor het vervaardigen van een beeldweergave-inrichting, beeldweergave-inrichting.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59214128A (ja) * 1983-05-18 1984-12-04 Mitsubishi Electric Corp 光吸収性パタ−ンの形成方法

Also Published As

Publication number Publication date
DE3672328D1 (de) 1990-08-02
GB2171529A (en) 1986-08-28
GB8504055D0 (en) 1985-03-20
JPS61233400A (ja) 1986-10-17
JPH0664994B2 (ja) 1994-08-22
EP0192301A2 (de) 1986-08-27
EP0192301A3 (en) 1988-01-27

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