DE1437892C3 - Process for the production of fluorescent screens for color television cathode ray tubes - Google Patents
Process for the production of fluorescent screens for color television cathode ray tubesInfo
- Publication number
- DE1437892C3 DE1437892C3 DE19651437892 DE1437892A DE1437892C3 DE 1437892 C3 DE1437892 C3 DE 1437892C3 DE 19651437892 DE19651437892 DE 19651437892 DE 1437892 A DE1437892 A DE 1437892A DE 1437892 C3 DE1437892 C3 DE 1437892C3
- Authority
- DE
- Germany
- Prior art keywords
- screen
- cathode ray
- production
- coating
- ray tubes
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/04—Chromates
-
- 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
- H01J29/225—Luminescent screens characterised by the binder or adhesive for securing the luminescent material to its support, e.g. vessel photosensitive adhesive
-
- 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)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Luminescent Compositions (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Kathodenstrahlröhren-Leuchtschirmen des Typs, welcher wiederkehrende Anordnungen oder Muster von Rot-, Grün und Blaulicht emittierenden Leuchtstoffen enthält.The invention relates to a method for the production of cathode ray tube luminescent screens of the Type, which emits repetitive arrangements or patterns of red, green and blue light Contains phosphors.
Das Verfahren entspricht dem Verfahrenstyp, bei welchem eine Leuchtstoff enthaltende lichtempfindliche oder Abdecksubstanz auf den Glas-Schirm einer Kathodenstrahlröhre aufgetragen wird. Ausgewählte Bereiche der Beschichtung werden belichtet, um das Deckschichtmaterial zu polymerisieren oder zu härten; hierbei wird der in dem belichteten Material enthaltene Leuchtstoff dauerhaft mit dem Schirm der Kathodenstrahlröhre verbunden. Die unbelichteten Anteile der Beschichtung werden entfernt und die vorhin genannten Stufen wiederholt, um drei Leuchtstoffe in einer gewünschten wiederkehrenden Anordnung, beispielsweise als Triaden-Muster für den Schirm einer Schattenblenden-Kathodenstrahlröhre, dauerhaft mit dem Schirm der Kathodenstrahlröhre zu verbinden.The method corresponds to the type of method in which a photosensitive substance containing a phosphor or covering substance is applied to the glass screen of a cathode ray tube. Selected Areas of the coating are exposed to polymerize or cure the topcoat material; in this case, the phosphor contained in the exposed material is permanently attached to the screen Cathode ray tube connected. The unexposed parts of the coating are removed and the the aforementioned steps repeated to produce three phosphors in a desired recurring arrangement, for example as a triad pattern for the screen of a shadow screen cathode ray tube, to be permanently connected to the screen of the cathode ray tube.
Bei diesem Verfahren stößt man auf zwei Probleme. Beide Probleme führen zu ungewünschten Schwankungen der Größe der auf dem Schirm der Kathodenstrahlröhre dauerhaft befestigten Leuchtstoff-Bezirke. Das erste Problem besteht darin, daß Temperaturen oberhalb 27° C eine ungewünschte »dunkle« Polymerisation des Deckschichtmaterials initiieren. Das zweite Problem besteht darin, daß die zur Belichtung des Leuchtstoff-Deckschicht-Materials erforderliche Zeit von der Körperfarbe des Leuchtstoffs abhängt. Leuchtstoffe mit weißer Körperfarbe, wie beispielsweise blau-emittierendes Zink-Cadmium-Sulfid erfordert eine geringere Belichtungszeit als rotemittierendes Zink-Cadmium-Sulfid der Körperfarbe orange. Die größere Belichtungszeit ergibt jedoch ungewünschte, durch Licht angeregte Polymerisation oder größere rot-emittierende Leuchtstoff-Bezirke als blau-emittierende Leuchtstoff-Bezirke. Sowohl die »dunkle« Polymerisation wie die Unterschiede hinsichtlich der Belichtungszeiten ergeben ungewünschte Schwankungen der Größe der rot-, grün- und blauemittierenden Leuchtstoff-Bezirke.Two problems are encountered with this approach. Both problems lead to undesirable ones Variations in the size of the fluorescent areas permanently attached to the screen of the cathode ray tube. The first problem is that temperatures above 27 ° C are undesirable Initiate "dark" polymerisation of the top layer material. The second problem is that the time required to expose the phosphor overlay material depends on the body color of the phosphor depends. Phosphors with a white body color, such as, for example, blue-emitting zinc-cadmium sulfide requires a shorter exposure time than red-emitting zinc-cadmium sulfide of the body color orange. However, the longer exposure time results in undesired, light-stimulated polymerization or larger red-emitting phosphor areas than blue-emitting phosphor areas. Both the “Dark” polymerization, like the differences in exposure times, result in undesirable ones Fluctuations in the size of the red, green and blue emitting fluorescent areas.
Nach der im Patentanspruch angegebenen Erfindung werden diese ungewünschten Schwankungen durch Anwendung eines Verfahrens zur Herstellung von Leuchtschirmen vermindert oder vollständig ausgeschaltet. Die dem Polyvinylalkohol beigegebenen Zusätze zur Kontrolle der Polymerisation regulieren die Polymerisationsgeschwindigkeit während der Herstellung eines Leuchtschirmes. Solche Zusätze umfassen Verbindungen, weiche die Geschwindigkeit der »dunklen« oder durch Wärme angeregten Polymerisation verzögern, als auch solche Verbindungen, welche die Geschwindigkeit der durch Licht angeregten Polymerisation beschleunigen. Die Wirkung solcher Regel-Zusätze besteht darin, daß sie die Ein-According to the invention specified in the claim, these undesirable fluctuations are reduced or completely eliminated by using a process for the production of fluorescent screens. Regulate the additives added to the polyvinyl alcohol to control the polymerization the rate of polymerization during the manufacture of a fluorescent screen. Such additives include Compounds that soften the rate of "dark" or heat-induced polymerization retard, as well as compounds that reduce the speed of those excited by light Accelerate polymerization. The effect of such rule additions is that they
ao heitlichkeit der Größe der Leuchtstoffmuster über den ganzen Leuchtschirm hinweg sicherstellen.ao ensure uniformity of the size of the fluorescent pattern over the entire luminescent screen.
Ein Deckschichtmaterial, welches für die Anwendung in dem beschriebenen Verfahren geeignet ist, enthält einen oder mehrere Alkohole mit drei Hydroxylgruppen zur Verzögerung der Geschwindigkeit der durch Wärme bewirkten Polymerisation und/oder einen oder mehrere Alkohole mit zwei OH-Gruppen, abgeleitet von der Äthylenreihe der Kohlenwasserstoffe zur Beschleunigung der Geschwindigkeit der durch Licht angeregten Polymerisation.A facing material which is suitable for use in the process described, contains one or more alcohols with three hydroxyl groups to slow down the speed the polymerization caused by heat and / or one or more alcohols with two OH groups, derived from the ethylene series of hydrocarbons to accelerate the speed of the by light-excited polymerization.
Ein Beispiel eines Deckschichtmaterials, welches Zusätze zur Regelung der Polymerisation enthält, wird durch Mischen von 4 bis 6 Volum teilen einer wäßrigen Lösung von Polyvinylalkohol (60 g PVA/ 1000 ml reines Wasser), 5 bis 7 Teilen von denaturiertem Äthylalkohol, 0,15 bis 0,50 Teilen Ammoniumdichromat, 0,1 bis 5 Volumprozent 1,2-Äthandiol, einem Zusatz zur Regelung der Polymerisation, welcher die durch Licht ausgelöste Polymerisation beschleunigt, und 0,001 bis 5% Glyzerin, einem Zusatz zur Regelung der Polymerisation, welcher die durch Wärme angeregte Polymerisation verzögert, erhalten; die erwähnten Prozentgehalte sind auf das Volumen des angewandten Polyvinylalkohole bezogen.An example of a top layer material that contains additives to regulate the polymerization, is made by mixing 4 to 6 parts by volume of an aqueous solution of polyvinyl alcohol (60 g PVA / 1000 ml of pure water), 5 to 7 parts of denatured ethyl alcohol, 0.15 to 0.50 parts of ammonium dichromate, 0.1 to 5 percent by volume of 1,2-ethanediol, an additive for regulating the polymerization, which accelerates the polymerization triggered by light, and 0.001 to 5% glycerine, an additive for controlling the polymerization, which delays the polymerization excited by heat, obtained; the percentages mentioned are based on the volume of the polyvinyl alcohols used.
Dieses Material wird dann auf den Schirm einer Kathodenstrahlröhre gebracht. Auf dieser Beschichtung wird dann ein Rot-, Grün- oder Blaulicht emittierender Leuchtstoff abgelagert. Die entstehende Beschichtung wird 8 bis 10 Minuten bei einer Temperatür im Bereich von 27 bis 38° C luftgetrocknet.This material is then placed on the screen of a cathode ray tube. On this coating a red, green or blue light emitting phosphor is then deposited. The resulting coating is air-dried for 8 to 10 minutes at a temperature in the range of 27 to 38 ° C.
Ausgewählte Bereiche der getrockneten Beschichtung werden zum Polymerisieren der Deckschicht belichtet, wobei der Leuchtstoff in diesen Bezirken des Schirms dauerhaft befestigt wird. Das unbelichtete, unpolymerisierte Material wird durch Wässern in einem Wasserbad entfernt. Der Schirm wird dann getrocknet und das Verfahren wiederholt, um die restlichen Leuchtstoffe mit dem Schirm zu verbinden. Der fertige Drei-Farben-Leuchtstoffschirm wird anschließend zur Entfernung flüchtiger Stoffe erhitzt und dann in eine Kathodenstrahlröhre eingedichtet.Selected areas of the dried coating are exposed to polymerize the top layer, the phosphor being permanently attached in these areas of the screen. The unexposed one Unpolymerized material is removed by soaking in a water bath. The screen is then dried and repeating the process to bond the remaining phosphors to the screen. The finished three-color fluorescent screen is then heated to remove volatile substances and then sealed in a cathode ray tube.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US38478964A | 1964-07-23 | 1964-07-23 | |
US384808A US3380826A (en) | 1964-07-23 | 1964-07-23 | Fabrication of image display screens |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1437892A1 DE1437892A1 (en) | 1968-10-24 |
DE1437892B2 DE1437892B2 (en) | 1974-01-31 |
DE1437892C3 true DE1437892C3 (en) | 1974-08-22 |
Family
ID=27010754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19651437892 Expired DE1437892C3 (en) | 1964-07-23 | 1965-07-22 | Process for the production of fluorescent screens for color television cathode ray tubes |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1437892C3 (en) |
GB (1) | GB1113203A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2411869C3 (en) * | 1974-03-12 | 1982-07-08 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Photochemical system for coating the fluorescent screen of color television tubes |
US4049452A (en) * | 1975-04-23 | 1977-09-20 | Rca Corporation | Reverse-printing method for producing cathode-ray-tube-screen structure |
EP0091163B1 (en) * | 1982-04-02 | 1987-11-25 | North American Philips Corporation | Positive-working photoresist composition and method for forming a light-absorbing matrix in a color crt structure |
JPS6166334A (en) * | 1984-09-06 | 1986-04-05 | Sony Corp | Manufacture of cathode-ray tube and photosensitive phosphor paste |
US7033712B2 (en) * | 2003-01-30 | 2006-04-25 | Thomson Licensing | Method of manufacturing a color filter cathode ray tube (CRT) |
-
1965
- 1965-07-22 DE DE19651437892 patent/DE1437892C3/en not_active Expired
- 1965-07-23 GB GB3158065A patent/GB1113203A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1437892B2 (en) | 1974-01-31 |
DE1437892A1 (en) | 1968-10-24 |
GB1113203A (en) | 1968-05-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) |