EP0449914A1 - Verfahren zur herstellung von leuchtschirmen für kathodenstrahlröhren - Google Patents

Verfahren zur herstellung von leuchtschirmen für kathodenstrahlröhren

Info

Publication number
EP0449914A1
EP0449914A1 EP90900826A EP90900826A EP0449914A1 EP 0449914 A1 EP0449914 A1 EP 0449914A1 EP 90900826 A EP90900826 A EP 90900826A EP 90900826 A EP90900826 A EP 90900826A EP 0449914 A1 EP0449914 A1 EP 0449914A1
Authority
EP
European Patent Office
Prior art keywords
sensitive
substances
ray tubes
luminous
light
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Withdrawn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
EP90900826A
Other languages
German (de)
English (en)
French (fr)
Inventor
Reiner Gerhard Stoll
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.)
DuPont de Nemours Deutschland GmbH
Original Assignee
DuPont de Nemours Deutschland 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 DuPont de Nemours Deutschland GmbH filed Critical DuPont de Nemours Deutschland GmbH
Publication of EP0449914A1 publication Critical patent/EP0449914A1/de
Withdrawn legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a method for producing fluorescent screens for cathode ray tubes by applying a pattern made of luminous pigments to the inside of the screen support made of glass.
  • it relates to a method for fixing the luminous pigment pattern on the glass faceplate.
  • luminous pigments have to be applied to the inside of the screen in the form of relatively fine patterns.
  • To create these patterns one starts from the light patterns that are easily available with the shadow mask and converts them into luminous pigment patterns using light-sensitive, mostly organic substances or preparations.
  • this process must be carried out separately for each pigment.
  • phototackifiable materials There are also known substances and preparations which become sticky on exposure (so-called phototackifiable materials). These are preferred because they enable the production of color picture screens by means of only one light-sensitive layer.
  • the organic components must be removed from the luminescent pigment layer by heating or by a dissolving process before the cathode ray tube is finished, in order to ensure a stable vacuum in the finished tube.
  • the object of the invention is to provide a method with which the luminous pigment pattern can be fixed on the faceplate after the photosensitive material has been removed without the pattern or the glass faceplate being damaged.
  • Another object of the invention is to provide a method which leads to fluorescent screens with good optical properties.
  • the new process should be able to be carried out at temperatures below 300 ° C and without an additional drying step. This object is achieved by the method described in the characterizing part of the main claim.
  • the luminescent pigment patterns can be fixed on the screen support if, after removal of the photosensitive substance, they are alternately repeated at a temperature below 300 ° C. in an atmosphere which contains a hydrolysis-sensitive gaseous silicon compound and an atmosphere which contains water vapor , suspends.
  • Suitable hydrolysis-sensitive silicon compounds are primarily those compounds which have a vapor pressure of 30 hPa at the working temperature. Examples of such compounds are silicon tetrachloride, hexachlorodisilane, silicon tetrabromide, trichlorosilane and tribosilane. Silicon tetrachloride is preferred for working temperatures below 100 ° C.
  • the working temperature is below 300 ° C. This prevents the glass support of the luminescent screen from deforming or losing its hardening. However, it is preferably carried out at 20 to 50 ° C.
  • Air is preferably used as the carrier gas for the atmospheres, which contain vapors of the reaction partners, and is appropriately dried before being mixed with the vapor of the hydrolysis-sensitive silicon compound.
  • any other gases which are inert with respect to the reactants in the temperature range of the working process for example nitrogen, argon or mixtures of such gases.
  • Suitable light-sensitive organic substances are preferably those which become tacky on exposure or lose their tackiness which is present at the beginning. Layers of these substances can be toned with the after the exposure of the light pattern powdered luminous pigment can be provided with the desired luminous pigment pattern. Suitable substances can be found, for example, in patent publications DE 12 10321, DE 19 04 059, DE 1944311, DE 2758209, DE 28 15894, DE 3023247, DE 3048490 and DE 3429615.
  • the luminescent pigments can also be mixed with substances that change their solubility in a suitable solvent by exposure to light.
  • the luminous pigment pattern is formed in layers of such mixtures by exposing the light pattern and washing it out.
  • the light-sensitive organic substances are removed.
  • this can be done by heating under reduced pressure.
  • the method according to the invention makes it possible to fix luminous pigments loosely adhering to glass screen supports without any mechanical action on them. This prevents damage to the pigment pattern.
  • the powder according to the invention achieves uniform fixation; the strength of the fixation can easily be adapted to the needs by changing the number of cycles. In general, a small number of cycles, for example 2 to 5, is sufficient to anchor the pigment pattern sufficiently firmly. There is no additional drying step. For these reasons, the method according to the invention can work much faster than according to the prior art.
  • luminescent screens of high optical quality and high emission are obtained.
  • the invention is used in the manufacture of fluorescent screens for cathode ray tubes, in particular for color television tubes.
  • the screen was treated with methyl ethyl ketone vapor analogously to the process described in EP 01 92 301 - A2, p.7.
  • the dried screen was placed on a flat base plate, which was provided with openings for the supply of air silicon tetrachloride vapor and moist air and for the removal of the used gases, and formed a reaction chamber of about 4 l with the screen.
  • the gap between the screen and the base plate was sealed with elastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Luminescent Compositions (AREA)
EP90900826A 1988-12-22 1989-12-21 Verfahren zur herstellung von leuchtschirmen für kathodenstrahlröhren Withdrawn EP0449914A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843157A DE3843157C1 (enrdf_load_stackoverflow) 1988-12-22 1988-12-22
DE3843157 1988-12-22

Publications (1)

Publication Number Publication Date
EP0449914A1 true EP0449914A1 (de) 1991-10-09

Family

ID=6369792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90900826A Withdrawn EP0449914A1 (de) 1988-12-22 1989-12-21 Verfahren zur herstellung von leuchtschirmen für kathodenstrahlröhren

Country Status (5)

Country Link
EP (1) EP0449914A1 (enrdf_load_stackoverflow)
JP (1) JPH04503130A (enrdf_load_stackoverflow)
KR (1) KR910700537A (enrdf_load_stackoverflow)
DE (1) DE3843157C1 (enrdf_load_stackoverflow)
WO (1) WO1990007189A1 (enrdf_load_stackoverflow)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE393967B (sv) * 1974-11-29 1977-05-31 Sateko Oy Forfarande och for utforande av stroleggning mellan lagren i ett virkespaket
FI57975C (fi) * 1979-02-28 1980-11-10 Lohja Ab Oy Foerfarande och anordning vid uppbyggande av tunna foereningshinnor
DE3048490C2 (de) * 1980-12-22 1982-09-02 Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf Lichtempfindliches Aufzeichnungsmaterial
DE3429615C1 (de) * 1984-08-11 1985-12-12 Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf Verfahren zur Erzeugung von aus Pulvern bestehenden Mustern
GB2171529A (en) * 1985-02-18 1986-08-28 Philips Electronic Associated 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
DE3541150A1 (de) * 1985-11-21 1987-05-27 Licentia Gmbh Verfahren zum herstellen eines leuchtschirms

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9007189A1 *

Also Published As

Publication number Publication date
KR910700537A (ko) 1991-03-15
DE3843157C1 (enrdf_load_stackoverflow) 1990-05-10
JPH04503130A (ja) 1992-06-04
WO1990007189A1 (de) 1990-06-28

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