Method of manufacturing the luminophore screen assembly
Abstract
A method of manufacturing a luminescent screen assembly (22) on a substrate (18) of a CRT faceplate includes the steps of providing a coating of a non-luminescent screen structure material (23) in a predetermined pattern on the substrate, and depositing a plurality of color-emitting screen structure materials (G,B,R) on the substrate so that they are bounded by the non-luminescent material. An electrostatically-charged dry-powdered resin is:deposited onto the color-emitting and non-luminescent screen structure materials and fused to form a substantially continuous film (46).
Term
No projected expiry on record.
- Priority
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15 claims: 3 independent, 12 dependent
- 1Patent claims Zastrzeżenia patentowe 1. A method of producing an electroluminescent screen assembly on a color CRT substrate, in which a layer of non-phosphor material of the screen structure is applied to the substrate in a specific arrangement, many elements of phosphor materials of the screen structure for individual colors are applied to the substrate, which elements are surrounded by this non-phosphor material, the phosphor materials of the screen structure for individual colors are attached to the ground, characterized by that during the fixing stage, electrostatically charged, dry powder resin is applied to the non-phosphor material (23) of the screen structure and to the phosphor materials (G, B, R) for individual colors and the resin melts, which produces a continuous coating / 46 /. 1. Sposób wytwarzania zespołu ekranu elektroluminescencyjnego na podłożu kineskopu kolorowego, w którym nakłada się na podłoże warstwę materiału nieluminoforowego struktury ekranu w określonym układzie, nakłada się na podłoże wiele elementów z materiałów luminoforowych struktury ekranu dla poszczególnych kolorów, które to elementy są otoczone przez ten materiał nieluminoforowy, przytwierdza się do podłoża te materiały luminoforowe struktury ekranu dla poszczególnych kolorów, znamienny tym, że podczas etapu przytwierdzania nakłada się naładowany elektrostatycznie, sproszkowany na sucho żywicę na materiał nieluminoforowy /23/ struktury ekranu i na materiały luminoforowe /G , B, R/ dla poszczególnych kolorów oraz roztapia się żywicę, przez co wytwarza się ciągłą powłokę /46/.
- 2A method of manufacturing an electroluminescent screen assembly on a color CRT substrate in which a surface of the substrate is covered, a vaporizable conductive layer is applied to this conductive layer, a vaporizable photoconductive layer containing visible photosensitive pigment, an even electrostatic charge is determined on the photoconductive layer, selected areas of the photoconductive layer are illuminated visible light, which affects the load in these areas, selected areas of the photoconductive layer are called triboelectrically charged, dry powdered phosphor material emitting light of the first color, the last three operations for triboelectrically charged, powdered aucho powdered phosphor materials of light of the second and third color are repeated, thereby producing an electroluminescent screen consisting of triads of image elements made of phosphors for individual colors, phosphor material is attached to the substrate for the first, second and third colors, characterized in that during the fixing stage the electrostatic charge is determined on the photoconductive layer / 34 / and on the applied phosphor materials / G, B, R /, electrostatically charged, powdered dry resin for phosphors and melt the resin, which produces a film coating / 46 /. 2. Sposób wytwarzania zespołu ekranu elektroluminescencyjnego na podłożu kineskopu kolorowego, w którym pokrywa się powierzchnię podłoża odparowywalny warstwę przewodzęcą nakłada się na tę warstwę przewodzącą odparowywalną warstwę fotoprzewodzącą zawierającą pigment czuły na światło widzialne, ustala się równomierny ładunek elektrostatyczny na warstwie fotoprzewodzącej, naświetle się wybrane obszary warstwy fotoprzewodzącej światłem widzialnym, przez co oddziałuje się na ładunek na tych obszarach, wywołuje się wybrane obszary warstwy fotoprzewodzęcej naładowanym tryboelektrycznle, sproszkowanym na sucho materiałem luminoforowym emitującym światło pierwszego koloru, kolejno powtarza się trzy ostatnie operacje dla naładowanych tryboelektrycznie, sproszkowanych na aucho materiałów luminoforowych emitujących światło drugiego i trzeciego koloru, przez co wytwarza się ekran elektroluminescencyjny składający się z triad elementów obrazowych z materiałów luminoforowych dla poszczególnych kolorów, przytwierdza się do podłoża materiał luminoforowy dla kolorów pierwszego, drugiego i trzeciego, znamienny tym, ze podczas etapu przytwierdzania ustala się ładunek elektrostatyczny na warstwie fotoprzewodzęcej /34/ i na nałożonych materiałach luminoforowych /G, B, R/, nakłada się naładowane elektrostatycznie, sproszkowaną na sucho żywicę na materiały luminoforowe i roztapia się żywicę, przez co wytwarza się cięgła powłokę /46/.
- 9A method for producing an electroluminescent screen assembly on an internal surface of a color cathode ray tube front plate in which the front plate surface is covered with a vaporizable conductive layer, imposes a vapor-conductive photoconductive layer containing a photosensitive pigment on the conductive layer, sets the 6th, measurable electrostatic charge on photoconductive layer, selected areas of the photoconductive layer with visible light from the kssnon lamp are irradiated through the mask, thereby affecting the charge on the photoconductive layer, non-exposed areas of the photoconductive layer are directly triggered with a triboelectrically charged, dry powdered, surface treated, light-absorbing material of the screen structure, where the charge on the screen structure material has polarization opposite to the charge on the unexposed areas of the photoconductive layer, the uniform electrostatic charge is again determined on the photoconductive layer and on the screen structure material, the mask of the first parts of the selected areas of the photoconductive layer with visible light from the xenon lamp, thereby affecting the charge on the photoconductive layer, the first parts of selected areas of the photoconductive layer are reversibly induced by a triboelectrically charged, wet powdered eccan structure material for the first color, having a charge with the same polarization as the charge polarization on the non-exposed areas of the photoconductive layer and on the light-absorbing material screen structure thereby causing the phosphor material to be repelled for the first color, and the last three operations are repeated for the second and third parts of the selected photoconductive layer using triboelectrically charged, dry powdered phosphor materials of the screen structure for the second and third colors, thereby producing an electroluminescent screen consisting of triads of image elements of phosphor materials for individual colors, is attached to the photoconductive layer, the light-absorbing phosphor materials, screen structures for individual colors, characterized in that during the fixing stage, an even electrostatic charge is determined on the photoconductive layer / 34 / and on the applied materials / 23, G, R, B / screen structure, applied electrostatically charged, dry powder resin on the screen structure materials and the resin is melted, thereby producing a continuous coating (46) insoluble in water. 9. Sposób wytwarzania zespołu ekranu elektroluminescencyjnego na wewnętrznej powierz163 986 chni płyty czołowej kineskopu kolorowego, w którym pokrywa się powierzchnię płyty czołowej odparowywalną warstwę przewodzącą, nakłada eię na warstwę przewodzącą odparowywalną warstwę fotoprzewodzącą zawierającą pigment czuły na światło widzialne, ustala 6ię rów-, nomierny ładunek elektrostatyczny na warstwie fotoprzewodzącej, naświetla się przez maskę wybrane obszary warstwy fotoprzewodzącej światłem widzialnym z lampy kssnonowej, przez co oddziałuje się na ładunek na warstwie fotoprzewodzącej, bezpośrednio wywołuje się nienaświetlone obszary warstwy fotoprzewodzącej naładowanym tryboelektrycznie, sproszkowanym na sucho, obrobionym powierzchniowo, pochłaniającym światło materiałem struktury ekranu, przy czym ładunek na materiale struktury ekranu ma polaryzację przeciwną do ładunku na nieneświetlonych obszarach warstwy fotoprzewodzącej, ustala się ponownie równomierny ładunek elektrostatyczny na warstwie fotoprzewodzącej i na materiale struktury ekranu, naświetla się przez maskę pierwsze części wybranych obszarów warstwy fotoprzewodzącej światłem widzialnym z lampy ksenonowej, przez co oddziałuje się na ładunek na warstwie fotoprzewodzącejt wywołuje się odwracalnie pierwsze części wybranych obszarów warstwy fotoprzewodzącej naładowanym tryboelektrycznie, sproszkowanym na mokro materiałem struktury ekcanu dla pierwszego koloru, mającym ładunek o takiej samej polaryzacji jak polaryzacja ładunku na nieneświetlonych obszarach warstwy fotoprzewodzącej i na pochłaniającym światło materiale struktury ekranu, przez co wywołuje się odpychanie materiału luminoforowego dla pierwszego koloru, i powtarza się trzy ostatnie operacje dla drugich i trzecich części wybranych obszarów warstwy fotoprzewodzącej przy zastosowaniu naładowanych tryboelektrycznie, sproszkowanych na sucho materiałów luminoforowych struktury ekranu dla kolorów drugiego i trzeciego, przez co wytwarza się ekran elektroluminescencyjny składający się z triad elementów obrazowych z materiałów luminoforowych dla poszczególnych kolorów, przytwierdza się do warstwy fotoprzewodzącej pochłaniające światło materiały luminoforowe struktury ekranu dla poszczególnych kolorów , znamienny tym, ze podczas etapu przytwierdzania ustala się równomierny ładunek elektrostatyczny na warstwie fotoprzewodzącej /34/ i na nałożonych materiałach /23, G, R, B/ struktury ekranu, nakłada się naładowaną elektrostatycznie, sproszkowaną na sucho żywicę na materiały struktury ekranu i roztapia się żywicę, przez co wytwarza się ciągłą powłokę /46/ nierozpuszczalną w wodzie.
Independent claims3
44 paragraphs, as filed
The present invention relates to a process for creating an electroluminescent screen assembly.
The known color tube with a shadow mask has a glass bubble from which the air has been pumped, containing inside a screen having a structure of phosphor elements for the colors green, red and blue, which are cyclically ordered. An electron gun produces three converging electron beams directed to the screen. The mask for color selection is made of a thin, windproof metal sheet located between the screen and the electron gun and allows selective stimulation of phosphor elements emitting radiation of a given color. The phosphor elements are surrounded by a material that absorbs light radiation.
An electrophotographic method for producing a color CRT screen is known from US Patent No. 3,475,169. The inner surface of the CRT faceplate is covered with conductive material and then a layer of photoconductive material. The photoconductive layer is then charged evenly, irradiated with selective light through a shadow mask, and finally the image is developed with the use of viscose and a liquid carrier. The liquid carrier is a suspension containing a certain amount of phosphor particles emitting light of a specific color, which are selectively deposited on suitably charged areas of the photoconductive layer. Charging, irradiation and deposition processes are repeated for each of three phosphors emitting light of a certain color. The electrophotographic process for producing the screen is also known from U.S. Patent 4,448,866, in which the adhesion of phosphors particles is increased by evenly illuminating a portion of the photoconductive layer located between the superimposed structure of phosphors particles after each deposition operation. This solution ensures more uniform charging of the photoconductor.
These two electrophotographic methods are carried out wet, which makes it impossible to achieve high resolution of devices, especially for displaying alpha-numeric texts.
It is known from U.S. Patent No. 4,921,767 and U.S. Patent Application Nos. 287 356 and 287 358 a method for producing an electroluminescent screen assembly for a color picture tube, in which triboelectrically charged, dry powdered materials of the screen structure are applied, e.g. a layer of dry powdered resin, and phosphor particles having a binding agent on the surface are subjected to surface treatment, regulating the triboelacric loading parameters of phosphors. During the process, the screen structure materials are electrically attracted to the photoconductive layer on the CRT front panel. Thermal bonding is used to attach relatively loosely bound, surface treated materials to the photoconductive layer, which sometimes causes the photoconductive layer to crack and delaminate during subsequent operations of the electroluminescent screen manufacturing process. Applying some protective layers of thermoplastic material to the phosphor applied in some triboelectric methods causes the introduction of additional organic compounds, which reduces the emission capacity of the phosphors.
The method according to the invention consists in applying an electrostatically charged, dry powder resin to the non-phosphor material of the screen structure and the phosphor materials for individual colors during the fixing step, and the resin melts, thereby producing a continuous coating.
in the method of the invention, during the fixing step, an electrostatic charge is fixed on the photoconductive layer and on the phosphor materials applied, electrostatically charged, dry powder resin is applied to the phosphors and the resin melts, thereby producing a continuous coating.
As dry powdered acrylic resin from the group consisting of n-butylmethacrylate, methylmethacrylate and polyethylene waxes.
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The resin is melted by heating to less than about 120 ° C. N-butylmethacrylate and methylmethacrylate are melted by treating the resin with a solvent.
The solvent treatment is carried out by placing the resin in a solvent mist spray, saturating the resin with solvent vapor and spraying the resin with solvent. The solvent used is a solvent selected from the group consisting of acetone, chlorobenzene, toluene, methyl ethyl ketone and methyl isobutyl ketone. A layer facilitating the flow of air is applied to the continuous coating, an aluminum layer is applied to the screen, the screen is heated at elevated temperature, which removes evaporable components from it and as a result an electroluminescent screen assembly is formed.
In a variant of the embodiment of the method according to the invention, during the fixation step, an even electrostatic charge is determined on the photoconductive layer and the applied materials of the screen structure, electrostatically charged, dry powder resin is applied to the materials of the screen structure and the resin melts, which produces a continuous insoluble coating. water.
As before, the dry powdered resin is selected as acrylic resin from the group consisting of n-butylnethacrylate, methylmethacrylate and polyethylene waxes.
The resin is melted by heating to less than about 120 ° C. N-butylmethacrylate and methylmethacrylate are melted by solvent treatment. The treatment of the resin with the solvent is carried out by placing the resin in a spray mist of solvent, saturating the resin with solvent vapor and spraying the resin with solvent. The solvent used is a solvent selected from the group consisting of acetone, chlorobenzene, toulen, methyl ethyl ketone and methyl isobutyl ketone. A layer facilitating the flow of air is applied to the continuous coating, an aluminum layer is applied to the screen, the screen is heated at elevated temperature, which removes evaporated components from it and as a result an electroluminescent screen assembly is formed.
The advantages of the invention are to provide dry production of an electroluminescent screen assembly with increased phosphor emission capacity, greater uniformity of structure and better adhesion of the applied layer to the substrate, preventing cracking and delamination of the photoconductive layer.
The subject of the invention is shown in the embodiment of the drawing, in which Fig. 1 shows the color tube produced by the method of the invention, Fig. 2 - the tube screen assembly of Fig. 1 and Figs. 3a-3g - selected operations of the method of producing an electroluminescent screen assembly.
Figure 1 shows a color tube 10 having a glass bulb 11 comprising a rectangular face plate 12 and a cylindrical neck 14 connected to the face plate 12 by means of a rectangular conical part 15. The conical part 15 has an inner conducting layer (not shown in the drawing) that makes contact with the anode clamp 16 and reaches the neck 14. The faceplate 12 has a screen portion 18 of the screen substrate and a peripheral flange portion 20 forming the side walls, attached to the conical portion 15 by means of a glass weld 21. A screen 22 made of three-colored phosphors is applied to the inner surface of the faceplate 12.
Shown in fig. 2 screen 22 is preferably a line screen which is formed of a large number of screen elements, each of which emits light. One of three colors: red, green, blue and of which phosphor elements each have the form of a ^ M band R, G, B, respectively, arranged in triangular groups, each group consisting of one strip emitting red light, one strip emitting green and one strip emitting blue light. These three-element groups are called triads and are arranged on the screen in po6
163 986 cyclic row, and their longitudinal axes are substantially perpendicular to the plane in which the electron beams are generated. After placing the CRT in the operating position, the phosphors are placed vertically. It is preferred that each phosphor strip is separated from adjacent phosphor strips by a material 23 forming a light-impermeable matrix known in the art. A thin aluminum conductive layer 24 covers the entire screen 22 and provides the ability to evenly distribute the potential on the screen, as well as the ability to reflect light emitted by the phosphors towards the viewer through the front panel 18. The screen 22 and the aluminum layer covering it 24 form a screen assembly.
As shown in Figure 1, a multi-hole color selection electrode called a shadow mask 25 is detachably mounted by known means at a predetermined distance from the screen assembly. The electron gun 26, schematically indicated by the dashed line in Fig. 1, is mounted coaxially inside the neck portion 14 and is intended to generate and direct three electron beams 28 along tapering paths through mask holes 25 towards screen 22. Launcher 26 may be, for example, a bipolar electron gun such as that described in US Patent No. 4,620133, or any other suitable launcher.
CRT 10 is constructed so that it can be used with an external magnetic deflection assembly 30 located in the area of connection of the neck portion with the conical portion of the CRT bulb. When excited, the deflecting assembly 30 acts on the three electron beams 28 through a magnetic field that causes the electron beams to deflect in the horizontal and vertical directions of the screen, forming a rectangular image matrix on the screen 22. The initial deflection plane (at zero deflection) marked by the pp line in Fig. 1 passes through the center of the deflection unit 30. Ola simplification, the actual curvature of the deflected beam paths in the deflection zone is not indicated in the drawing.
Screen 22 is produced by a new electrophotographic method according to the invention, which is schematically shown in figures 3a-3g. Initially, the faceplate 12 is washed with a caustic soda solution, rinsed with water, digested in a buffered hydrofluoric acid solution and rinsed again with water, as in the method known in the art. Then, the inner surface of the screen portion of the faceplate 18 is covered with a layer 32 of electrically conductive material, which layer is an electrode for the photoconductive layer 34 to be applied. The photoconductive layer 34 consists of a vaporizable organic polymer material, a photoconductive dye that is sensitive to visible light and has suitable properties, and solvent. The composition and method of forming the conductive layer 32 and the photoconductive layer 34 are described in the above-identified accompanying patent application number 287 356.
Photoconductive layer 34 applied to electrically conductive layer 32 It is charged in a dark chamber by the known device 36 producing positive charges as a result of corona discharge, schematically shown in Fig. 3b, which device slides along the surface of layer 34 and charges it to potential + 200 to +7 (00v, preferably up to +200 to + 200V potential). The shadow mask 25 is positioned in front of the faceplate 12, after which the positively charged photoconductor is irradiated by the shadow mask with light emitted by the xenon flash 38 located inside the known light chamber represented by the lens 40 in Fig. 3c. After each exposure, the lamp is moved to a different position, which ensures a change in the angle of incidence corresponding to the change in the angle of convergence of electron beams generated by the electron gun. Photoconductive layer 34 is illuminated three times when the lamp is positioned in three different positions, which is to discharge the photoconductor areas on which light-emitting phosphors to form the screen are to be applied in subsequent operations. After the irradiation operation, the shadow mask 25 is removed and the faceplate is placed in the first developing device 42 / fig. 3d /. The first developing device contains appropriately crafted dry-stranded particles of light-absorbing black material that cleaves the black matrix structure of the screen and surface-treated insulating beads / beads / charge carrier / not shown in the drawing /, whose diameter is from 100 to 300 μη and which convey triboelectric charge to black matrix material particles, as described above. Suitable materials for the black matrix generally contain black dyes that are stable to 450 ° C. at which a picture tube is processed. Black dyes, suitable for use as black matrix materials, include iron-manganese oxides, iron-cobalt oxides, iron-zinc sulfates, and black soot insulating material. The material for the black matrix is prepared by melting the mixture consisting of a pigment, a polymer and a suitable charge regulating agent that regulates the value of the triboelectric charge transmitted to the matrix material. The material is ground so that the average particle size is about 5 mkm.
The black matrix material and surface treated charge carriers - beads - are mixed in a developing apparatus 42, with about 1 to 2% by weight of the black matrix material being used. The black matrix material and beads are mixed so that the crushed particles of the black matrix material rub against the beads and charge, for example, negatively surface treated beads - carriers of electric charge. Negatively charged particles of the black matrix material are ejected from the developing device and attracted by the positively charged unexposed areas of the photoconductive layer 34 to directly develop these areas.
Photoconductive layer 34, with matrix 23, is evenly charged to a positive potential of about 200 to 400V, using the first of three triboelectrically charged dry-powdered light-emitting color materials of the screen structure. Unless surface-treated phosphor materials are preferred because of their greater emission efficiency, the surface-treated phosphor materials described in U.S. Patent No. 4,921,727 and Patent Application No. 286 358 may also be used. The shadow mask 25 is reattached to the face plate 12, after which the selected areas of the photoconductive layer 34 corresponding to the places where the phosphor material emitting the green light is to be applied, are exposed by visible light when the face plate is placed in the first position relative to the light source in the chamber exposure, which selectively discharges the exposed areas. The first position of the light source relative to the front plate corresponds approximately to the convergence angle of the electron beam, which hits the illuminator emitting green light. The shadow mask, after exposure, is removed from the faceplate 12 and the faceplate is placed in the second developing device 42. The second developing device contains triboelectrically charged dry powder powders of green light emitting phosphor material and surface treated carrier beads.
One thousand grams of surface-treated carrier beads are mixed with about 15 to 25 grams of phosphor particles in a second developing device 42. The carrier beads are treated with a fluorosilane trapping agent to give, for example, a positive charge to phosphor particles. To negatively charge phosphor particles, an aminosilane binding agent is used on the carrier beads. The positively charged phosphor particles emitting green light are stripped from the developing device 42, repelled by the positively charged areas of the photoconductive layer 34 and matrix 23 and deposited on the discharged exposed areas of the photoconductive layer in a process known as reversible development.
Charging, irradiation and development process. It is repeated for dry-powdered blue and red light-emitting phosphors of screen structure materials. Exposure to visible light for the selective discharge of positively charged areas of photoconductive layer 34 is carried out at source 8
163 986 light first in the second and then in the third position inside the irradiation chamber, which positions approximately correspond to the convergence angles of the electron beams hitting the phosphors emitting blue and red light, respectively. Triboelectrically positively charged dry-powdered phosphor particles are mixed with the surface-treated beads in the proportion given above and stripped from the third and then the fourth developing devices, repelled by positively charged areas of previously applied screen structure materials and deposited on the discharged areas of the photoconductive layer 34 to obtain phosphor elements emitting blue and red light, respectively.
Screen structure materials, containing surface treated black matrix material and phosphor particles emitting green, blue and red light, are electrostatically attached or combined with a photoconductive layer 34. Adhesion of materials of the screen structure can be increased by directly applying electrostatically charged dry powder coating resin in the fifth developing device 42 / Fig. 3f /. The conductive layer 32 is grounded when applying the resin. A substantially uniform positive potential of around 200 to 400v can be applied to the photoconductive layer and the screen structure materials applied to it using a device operating with an electric discharge 36 / Fig. 3e / before the application of the protective layer, which aims at providing a pulling potential and to ensure uniform application of the resin, which in this case would be negatively charged. The electric discharge device may be, for example, a Ransburg launcher that charges resin particles as a result of corona discharge. The resin is an organic material with a low glass transition temperature, a flow rate of about 120 ° C and a pyrolization temperature of less than 400 ° C. The resin is insoluble in water, preferably it has irregularly shaped particles for better distribution of charge, and the size of its particles is less than 50 mkn. The preferred material is n-butyl methacrylate. However, other acrylic resins, for example methyl methacrylates and polyethylene waxes, can also be used successfully.
Ha of the screen / 2 / face plate surface 18 is applied from about 1 to 10, preferably about 2 grams, powdered coating resin. The faceplate is then heated to a temperature of 100 to 120 ° C for about 1 to 5 minutes using a heat source such as radiators 44 / Fig. 3g /, which aims to bring the resin to a liquid state and to form a substantially continuous coating 46 that binds the materials of the screen structure to the faceplate 18. For example, it takes three minutes to melt 2 grams of resin if several longitudinal radiators are used, such as CH-40 radiators supplied by CORNING GLASS 'WORKS, CORNING, NY The coating 46 is insoluble in water and acts as a protective barrier in the event that further operations related to the production of the coating are required, carried out wet, carried out, for example, to increase the thickness of the coating, when applying additional coatings or to increase the uniformity of the protective coating. If a sufficient amount of dry-powder coating resin is used, no further application of protective coatings is needed. A solution of boric acid or ammonium oxalate at a concentration of 2 to 4λ by weight is sprayed onto the protective coating 46, in order to produce a ventilation-friendly coating (not shown in the drawing). The faceplate is then covered with a layer of aluminum, which operation is known in the art and is heated at a temperature of about 425 ° C for about 30 to 60 minutes, or until the organic constituents evaporate from the screen assembly. The sintering of the ventilation-friendly coating occurs at a temperature of 185 ° C, while forming in the aluminum layer micro-holes that facilitate the drainage of organic components without delamination of the aluminum layer.
Dry-powdered resins, with the exception of polyethylene waxes, can also be shaped or melted to form a coating 46 by exposing electrostatically applied resins to a suitable solvent, for example, acetone
163 936 / which is preferred /, chlorobenzene, toluene, methyl ethyl ketone = MeK or methyl isobutyl ketone = MIBK. Exposing the layer to a solvent (not shown in the drawing) can be accomplished by placing a compound in the environment, by vaporization or by direct spraying. Methods based on the use of solutions provide the possibility of obtaining a more even layer 46 than the heating methods described above, however, it is required that special means of ventilation and ventilation are provided. Of the three methods, consisting in the use of solutions to obtain a protective coating, evaporation is the slowest, but at the same time the most accurate and least susceptible to distortion of the resin coating and the lower coatings of materials of the screen structure. Direct spraying of the solution is the fastest way and does not require the use of complicated devices, however, it can cause displacement of the lower layers of the material of the screen structure. The most advantageous method of applying solutions when applying protective coatings is to expose the inner surface of the faceplate with the screen structure applied to the fog formed from the sprayed coating solution. This optimizes the process by combining spraying speed with vaporization accuracy.
While the invention has been described with reference to the application of screen layers using dry powder materials of the screen structure, the protective dry powder resin coatings of the invention can be used in conjunction with the conventional wet photolithographic process of applying screen layers.
in wet processes, the light absorbing matrix consists of a suitable dark pigment in the form of elemental carbon, which is applied to the inner surface of the faceplate by the methods described in US Patent No. 3,558,310 which methods have been improved as described in the patent Of United States of America No. 4 049 452. The inner surface of the faceplate is covered with a layer of pure polymer material whose solubility is affected by the radiation energy. A shadow mask is placed near the faceplate above the coating, after which light is passed through the mask. The exposed areas of the coating are cured and thus become insoluble in water. The mask irradiation is repeated two more times. Each time the light is directed at a slightly different angle so that the coating cures in areas that form triads, which is known in the art. After exposure, the shadow mask is removed from the faceplate, and the exposed coating is rinsed with water to remove water-soluble unlit portions of the coating and to expose areas of the faceplate while leaving areas with an insoluble coating on it. Then, the developed coating is covered with a layer containing particles of screen structure material such as the above-mentioned elemental carbon in the form of a suitable mixture. The applied coating is dried and cooled. After cooling, it is checked that the last layer is well bound in areas covered by the polymer layer and in exposed areas of the face plate surface. Finally, the remaining areas of the polymer layer are removed together with the later applied cover layer, so that parts of the cover layer associated with the exposed areas of the faceplate surface remain, which I am now creating the matrix.
Phosphor elements are formed in those areas of the faceplate surface that were previously coated with an insoluble polymer layer using the wet photolithographic method described in US Patent No. 2,625,734.
After forming the matrix and phosphor elements by the conventional method described in US Patent No. 2,625,734, coating the screen structure with a resin protective layer can be carried out according to the invention. The matrix, formed of carbon (electrically conductive material) is grounded and electrostatically charged with a negative charge. Dry - powder based resin is applied to the materials of the screen structure. The matrix is grounded to prevent excessive
163 986 increasing the negative potential, as this could cause the dry-powdered resin to break away from the substrate. The coating resin, applied as described above, is brought to a liquid state to form a substantially continuous, even coating. As coating 46 described above. The above-described ventilation-promoting layer and the aluminum layer are sprayed onto this coating and heat-treated as described in publications relating to the known art.
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Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 36587789 | United States of America | A | |
| 89365877 | – | – | – |
| US19890365877 | – | – | – |
Members21
| Document | Office | Kind | |
|---|---|---|---|
| CA2016460A1 | Canada | A1 | |
| EP0403263A2 | European Patent Office (EPO) | A2 | |
| PL285583A1 | Poland | A1 | |
| KR910001843A | Republic of Korea | A | |
| JPH0330232A | Japan | A | |
| EP0403263A3 | European Patent Office (EPO) | A3 | |
| US5028501A | United States of America | A | |
| DD295276A5 | German Democratic Republic (until 1990) | A5 | |
| CN1062429A | China | A | |
| TR25721A | Türkiye | A | |
| CN1022717C | China | C | |
| EP0403263B1 | European Patent Office (EPO) | B1 | |
| DE69006927D1 | Germany | D1 | |
| PL163986B1This record | Poland | B1 | |
| DE69006927T2 | Germany | T2 | |
| RU2051440C1 | Russian Federation | C1 | |
| JPH088063B2 | Japan | B2 | |
| CZ288290A3 | Czechia | A3 | |
| CZ281125B6 | Czechia | B6 | |
| KR0174534B1 | Republic of Korea | B1 | |
| CA2016460C | Canada | C |
Numbers
- Publication, DOCDB
- 163986
- Publication, EPODOC
- PL163986B
- Application
- 90285583
- Application, DOCDB
- 28558390
- Application, EPODOC
- PL19900285583
Titles
- English
- METHOD OF MANUFACTURING THE LUMINOPHORE SCREEN ASSEMBLY
Classification
- CPC, 2
- H01J9/225
- H01J9/2276