WO1998027570A1 - Procede de fabrication d'ecran a plasma et dispositif correspondant - Google Patents
Procede de fabrication d'ecran a plasma et dispositif correspondant Download PDFInfo
- Publication number
- WO1998027570A1 WO1998027570A1 PCT/JP1997/004643 JP9704643W WO9827570A1 WO 1998027570 A1 WO1998027570 A1 WO 1998027570A1 JP 9704643 W JP9704643 W JP 9704643W WO 9827570 A1 WO9827570 A1 WO 9827570A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plasma display
- base
- phosphor
- discharge port
- substrate
- Prior art date
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- 229920000609 methyl cellulose Polymers 0.000 description 1
- LUCXVPAZUDVVBT-UHFFFAOYSA-N methyl-[3-(2-methylphenoxy)-3-phenylpropyl]azanium;chloride Chemical compound Cl.C=1C=CC=CC=1C(CCNC)OC1=CC=CC=C1C LUCXVPAZUDVVBT-UHFFFAOYSA-N 0.000 description 1
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- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
- H01J2211/20—Constructional details
- H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
- H01J2211/42—Fluorescent layers
Definitions
- the present invention relates to a novel method for producing a plasma display suitably used as a display for a wall-mounted television, information display, and the like, and a production apparatus for the same.
- the present invention relates to a means for providing a plasma display capable of forming a phosphor layer corresponding to a high definition plasma display in such a field.
- a discharge is generated in a discharge space formed between a front plate and a back plate. Due to this discharge, xenon gas generates ultraviolet rays centered at a wavelength of 147 nm, and the ultraviolet rays excite the phosphor to enable display.
- the drive circuit emits light from the discharge cells, each of which is coated with a phosphor that emits R, G, and B light, enabling full color display.
- AC-type plasma displays which are being actively developed, have a front glass substrate on which a display electrode dielectric layer and a protective layer are formed, and a back side on which address electrodes and dielectric layers are formed. It has a structure in which a mixed gas of He-Xe or Ne-Xe is sealed in a discharge space separated by a strip-shaped partition by laminating a glass substrate.
- Japanese Unexamined Patent Publication No. Hei 6-52005 discloses a method of using a sandplast after screen printing
- Japanese Unexamined Patent Publication No. 5-144375 discloses a method of using a crosslinking agent. Screen printing methods have been proposed after coating.
- the method using screen printing has the drawback that it is difficult to form a phosphor layer that is compatible with a high-definition plasma display because the shape of the screen plate changes during repeated printing, and it is difficult to form a phosphor layer.
- the cost was high because the expensive screen plate had to be replaced frequently.
- a method for forming a phosphor layer corresponding to a high-definition plasma display a method using a photosensitive phosphor paste obtained by mixing phosphor powder and a photosensitive binder resin is also known.
- a photosensitive base is applied to the entire surface of the substrate on which the partition walls are formed, and is partially irradiated with light using a photomask to form a soluble portion and an insoluble portion in a developing solution, and then developed. And leave the necessary parts.
- this method requires complicated processes such as three times of RGB coating, exposure, development and drying to form the red (R), green (G), and blue (B) phosphor layers. .
- this method has a disadvantage that the phosphor paste loses a lot, and there is a problem that the cost is high.
- An object of the present invention is to provide a method of manufacturing a plasma display in which a phosphor layer can be easily and accurately formed between high-definition partition walls.
- Another object of the present invention is to provide a manufacturing apparatus for continuously producing the above high-quality plasma display at a high productivity level.
- the method of manufacturing a plasma display according to the present invention includes the steps of: continuously discharging a phosphor paste containing a phosphor powder and an organic compound from a base having a plurality of discharge ports onto a substrate on which a plurality of partition walls are formed; Is formed. Further, the method of manufacturing a plasma display of the present invention is characterized in that three types of phosphor pastes containing phosphor powders that emit red, green, and blue light, respectively, are provided on a substrate on which a plurality of partition walls are formed. A manufacturing method characterized in that a phosphor layer is formed by applying a strip shape from a base provided to a space between partitions on a substrate and then heating.
- the method for manufacturing a plasma display according to the present invention includes the following preferred embodiments.
- the discharge port is a flat plate, nozzle or needle.
- a base having from 200 to 2000, more preferably from 150 to 2000 discharge ports is used.
- a paste containing phosphors emitting different colors is discharged from one base, and the shortest interval between the discharge ports for discharging the phosphor pastes of different colors is at least 600 ⁇ . thing.
- the phosphor base discharge is started after the relative movement of the base and the substrate is started in parallel with the partition on the substrate, and the discharge is stopped before the end of the relative movement.
- a phosphor powder having a 50% by weight particle size of 0.5 to 10 zm and a specific surface area of 0.1 to 2 m 2 Zg is used.
- Fluorescent light comprising 30 to 60% by weight of phosphor powder, 5 to 20% by weight of binder resin and a solvent, and the weight ratio of phosphor powder to binder resin is 6: 1 to 3: 1. Use body paste.
- the binder resin is a cell opening compound.
- the solvent is a solvent containing terpineol.
- a method for manufacturing a plasma display in which a phosphor screen is formed by applying three types of phosphor bases, each containing a phosphor powder that emits red, green, and blue light, between partition walls on a glass substrate. And removing the phosphor present at a position other than the predetermined application position by attaching it to the adhesive.
- the phosphor paste is a photosensitive phosphor paste.
- the partition layer has a stripe shape having the following dimensions.
- the plasma display manufacturing apparatus of the present invention includes: a table for fixing a substrate having a plurality of partition walls formed on a surface thereof; a base having a plurality of discharge ports facing the partition wall of the substrate; It is characterized by comprising supply means for supplying a body paste, and moving means for moving the table and the base relative to each other three-dimensionally.
- the plasma display manufacturing apparatus of the present invention includes the following preferred embodiments.
- the average hole diameter (D) of the discharge port of the die satisfies the following condition with respect to the partition wall spacing (S).
- the shape of the outlet of the base is not circular, and the opening length (B) substantially perpendicular to the partition wall satisfies the following condition with respect to the partition wall interval (S).
- the pitch of the outlets of the base is 3 m times the partition wall pitch (m is an integer of 1 to 10).
- the outlet of the base is configured by arranging pipes of the same shape.
- the number of outlets of the base is 20 to 2000.
- the number of outlets of the base is in a range of 16 n ⁇ 5 (n is a natural number).
- the pitch of the outlets of the base is 0.12 to 3 mm.
- the average diameter of the outlet of the base is 60 to 400 m.
- the center of the discharge port of the base is arranged above each partition wall.
- a fluorine resin film is coated on the discharge port surface and / or the discharge port inner wall of the base.
- An amorphous carbon film is coated on a discharge port surface and / or a discharge port inner wall of the base.
- the base fluidly connects the plurality of phosphor paste storage units, the phosphor paste supply port that supplies the phosphor paste to the storage unit, and the storage unit and the discharge port.
- a pressure adjusting means capable of arbitrarily setting the pressure in the base from atmospheric pressure to a negative pressure, and a control means for controlling the timing of the pressure adjustment.
- detecting means for detecting the position of the discharge port of the die, between the partition wall of the substrate or the partition wall Detecting means for detecting the position; detecting means for detecting the position of the upper end of the partition wall on the substrate; detecting means for detecting the position of the tip of the discharge port of the base; and the relative position of the substrate with respect to the discharge port of the base Control means for controlling the start and end of the discharge of the phosphor paste according to the conditions.
- a detecting means is provided for detecting the position in the substrate of the phosphor paste discharged from the base onto the substrate.
- a detecting means for detecting the number of partitions on the substrate or between the partitions, and a recognizing means for recognizing between the partitions to be applied based on the detected number of partitions or the number of partitions are provided.
- the origin mark detecting means for detecting the origin mark provided on the substrate, and the above-mentioned base is provided such that the discharge port of the base is located between the partition walls to be coated with the phosphor paste based on the detected origin mark.
- Moving means and control means for relatively moving the base and the partition have been provided.
- a means for cleaning the discharge port surface of the base is provided.
- a means is provided for removing the phosphor paste existing at a position other than the predetermined application position on the substrate.
- three coating devices each provided with a moving means for three-dimensionally moving the table and the base relative to each other are arranged in series corresponding to three types of phosphor pastes.
- FIG. 1 is a schematic diagram of a coating device for explaining an example of a photoconductor paste coating process of the present invention.
- FIG. 2 is a cross-sectional view for explaining the relationship between the plasma display substrate and the coating die according to the present invention.
- FIG. 3 is a schematic diagram of a plasma display manufacturing apparatus according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram for explaining a main part of the plasma display manufacturing apparatus shown in FIG.
- FIG. 5 is a perspective view showing an example of a base used in the present invention.
- FIG. 6 is a perspective view showing an example of another base used in the present invention.
- FIG. 7 is a cross-sectional view and a bottom view showing an example of still another base used in the present invention.
- FIG. 8 is a perspective view of a plasma display manufacturing apparatus according to another embodiment of the present invention.
- FIG. 9 is a side view showing a device for cleaning a discharge port surface of a base in a plasma display manufacturing apparatus of the present invention.
- a plasma display mainly consists of a front panel and a rear panel, and a rare gas is sealed between the two.
- the back plate it is necessary to form a phosphor layer on a substrate on which electrodes for applying a driving voltage and partitions for partitioning discharge cells are formed.
- discharge stabilization is achieved by forming an additional dielectric layer on the substrate.
- a glass substrate such as soda glass or PD 200 (manufactured by Asahi Glass Co., Ltd.) commercially available for a plasma display, or a ceramic substrate can be used. Glass having a substrate thickness of preferably 1 to 3 mm, more preferably 2 to 3 mm can be used.
- An electrode made of a conductive metal is formed on the substrate.
- electrode materials include metal materials containing at least one selected from gold, silver, copper, chromium, palladium, aluminum and nigel. These metals The material is used to form electrodes having a required pattern shape, preferably with a thickness of 0.1 to 10 m, more preferably 1 to 5 m.
- a metal paste obtained by kneading the above metal powder and an organic binder containing a cellulose compound represented by ethyl cellulose is patterned on a glass substrate using a screen plate.
- a printing method a method in which a metal film is formed on a glass substrate by vacuum evaporation or sputtering, and then etching is performed using a resist can be used.
- Another preferred method is to apply a photosensitive base obtained by kneading a metal powder and an organic binder component containing a photosensitive organic component onto a glass substrate, and then apply a photomask.
- Light emission can be stabilized by further forming a dielectric layer on this electrode.
- the dielectric is formed by applying a glass paste made of an organic binder containing a glass powder and a cellulose compound represented by ethyl cellulose, and then baking at 450 to 600 ° C. Can be.
- a glass paste consisting of glass powder and an organic binder containing a cellulose compound typified by ethyl cellulose is printed in a multilayer pattern on a screen plate at 450 to 600 ° C. It can be formed by firing.
- the partition walls are formed by applying a glass paste on the entire surface of the substrate, laminating a dry film resist, using a pattern formed by photolithography as a mask, grinding by sandblasting, and then firing. Can be formed.
- One preferred method for forming the partition walls is to apply a photosensitive glass paste obtained by kneading a glass powder and a photosensitive organic component on the entire surface of a substrate, and then perform photolithography using a photomask. This is a method of performing pattern formation and baking.
- Stripe-shaped or grid-shaped barrier ribs are used to partition the discharge of each discharge cell. Stripe-shaped barrier ribs can be formed easily at low cost. It is preferable because it is possible.
- a phosphor layer can be formed on a glass substrate having a high-definition partition wall, which is difficult to form by conventional screen printing.
- the partition layer is a stripe-shaped partition having the following preferred dimensions, a defect-free phosphor layer can be formed as compared with the screen printing method.
- the image recognition can be further facilitated by making the upper surface of the partition wall formed on the substrate black.
- the phosphor layer is formed by discharging a paste containing the phosphor powder from a base having a plurality of discharge ports on the glass substrate on which the partition walls are formed as described above.
- a phosphor powder that emits red, blue, and green light is used as the phosphor powder used.
- the phosphor powders used in the present invention for example, in red, Y 2 ⁇ 3: E u YV_ ⁇ 4: E u (YG d) BO a: E u, Y 2 ⁇ 3 S: E u, ⁇ one Z n 3 (P_ ⁇ 4) 2: Mn (Z n C d) S: such as Ag + I n 2 ⁇ 3.
- Z n 2 G e ⁇ 2 MB aA l 12 ⁇ 19 : Mn Z n 2 S i ⁇ 4 : Mn L a PO Tb
- Z n S C u A l Z n S: Au, Cu
- a l (Z n C d) S C u A l Z ⁇ 4: Mn
- Tm thulium
- Tb terbium
- Eu europium
- Y yttrium
- Gd gadmium
- Lu lutetium
- a rare earth tantalate phosphor in which at least one of the rare earth elements constituting the matrix selected from the above is substituted can be used.
- a preferred rare earth tantalate phosphor is a europium-activated yttrium tantalate phosphor represented by a composition formula Y X E x T a C (where X is approximately 0.0050.1). is there.
- europium-activated yttrium tantalate is preferred.
- terbium-activated tantalum acid rare earth phosphor represented by the composition formula Y b X T a 0 4 (wherein, X is approximately 0.0 0 1 to 0.2) Yttrium tantalate is preferred.
- ⁇ ⁇ is an average particle size activated by 0.2% by weight or more and less than 0.1% by weight based on the amount of zinc silicate (Zn 2 Si 0 4 ). ⁇ m above 8.
- the manganese-activated zinc silicate phosphor is preferably represented by the following formula:
- the particle size of the phosphor powder used in the above is selected in consideration of the line width, line spacing (space) and thickness of the phosphor layer pattern to be produced. 5 ⁇ 1 0 zxm, specific surface area 0. 1 ⁇ 2 m 2, preferably more preferably c be Zg 50 wt% particle diameter of 0.. 5 to 5 m, a specific surface area of 0. 2 ⁇ 1. 0 m 2 / g.
- the particle diameter and the specific surface area are in these ranges, kneadability of the paste can be improved and a dense phosphor layer can be formed, so that luminous efficiency can be improved and a long life can be obtained.
- the phosphor powder As the shape of the phosphor powder, a polyhedral (granular) powder can be preferably used, but a powder without aggregation is preferable. Among them, spherical powder is more preferable because it can form a dense phosphor layer and thus has the advantage of improving the luminous efficiency, and can reduce the influence of scattering during exposure.
- the phosphor powder preferably has a particle shape with a sphericity of 80 number% or more. More preferably, the sphericity is 90% by number or more.
- the organic component used in the present invention includes a binder resin, a solvent, and, if necessary, additives such as a plasticizer, a dispersant, and a leveling agent.
- binder resin examples include polyvinyl butyral, polyvinyl acetate, polyvinyl alcohol, polyethylene, silicone polymer (for example, polymethyl siloxane, polymethyl phenyl siloxane), polystyrene, buta-genostyrene copolymer, Polystyrene, polyvinylpyrrolidone, polyamide, high molecular weight polyether, copolymers of ethylene oxide and propylene oxide — polyacrylamide and various acrylic polymers (eg, sodium polyacrylate, poly lower alkyl acrylate, poly lower alkyl) Examples include various copolymers and multipolymers of methacrylate and lower alkyl acrylate and methacrylate.
- a cellulose compound for example, methylcellulose, ethylcellulose, hydroxyshethylcellulose, methylhydroxyshethylcellulose
- a phosphor layer with less binder residue after firing.
- plasticizer examples include dibutyl phthalate, octyl phthalate, polyethylene glycol, glycerine and the like.
- the solvent include terpineol, isobutyl alcohol, isopropyl alcohol, benzyl alcohol, 2-phenoxyethanol, phenylaryl alcohol, dimethylbenzylcarbinol, i3-phenylethyl alcohol, and methyl sorbol.
- Alcohol solvents such as ethyl sorbet and butyl sorb, methyl ethyl ketone, dioxane, acetone, cyclohexanone, cyclopentanone, tetrahydrofuran, butyl carbitol acetate, dimethyl sulfoxide, ⁇ butyrolactone, Bromobenzene, chlorobenzene, dibromobenzene, dichlorobenzene, bromobenzoic acid, chlorobenzoic acid and the like, and an organic solvent mixture containing at least one of these are used.
- alcohol-based solvents are advantageous in dispersing the powder.
- terbineol is particularly preferred. Further, by using a mixture of terbeneol and another alcohol solvent such as benzyl alcohol, the viscosity of the paste can be easily adjusted.
- the phosphor powder, the binder and the solvent are mixed and kneaded at a desired ratio to prepare a phosphor paste, preferably by using a paste having a viscosity of 2 to 50 Pas. Control the thickness of the partition wall when applying paste This is effective for improving brightness and display uniformity.
- a phosphor paste having a phosphor powder to binder-to-resin weight ratio of 6: 1 to 3: 1 can further improve the uniformity of thickness when producing fine PDP.
- a preferred paste has a composition of 30 to 60% by weight of a phosphor powder emitting one of red, green and blue, 5 to 20% by weight of a binder resin and 20 to 65% by weight of a solvent. By using such a composition, a phosphor layer having a uniform thickness can be formed on the side wall of the partition wall and the bottom of the discharge space without depending on the drying conditions after the paste is applied.
- the paste composition when the height of the partition walls of the plasma display to be manufactured is Hm, the partition wall pitch is Pzm, and the partition line width is Wm, the ratio of the phosphor powder contained in the phosphor paste a ( V o 1%), a phosphor layer having a uniform thickness can be formed on the side wall of the partition wall and the bottom of the discharge space by setting the composition to satisfy the following formula.
- Organic dyes include leuco dyes, azo dyes, aminoketone dyes, xanthene dyes, quinoline dyes, aminoketone dyes, anthraquinone dyes, benzophenone dyes, diphenyl cyanoacrylate dyes, triazine dyes, p- Aminobenzoic acid dyes and the like can be used.
- Stample-1, Sudan4, Victor Pureable, Nile Blue, Brilliant Green, Neutral Red, Methyl Violet, etc. can be used.
- a photosensitive phosphor base containing a photosensitive compound as the binder resin may be used.
- the photosensitive phosphor paste By using the photosensitive phosphor paste, exposure and development can be performed using a photomask to remove the phosphor paste attached to unnecessary portions.
- the applied phosphor paste adheres to the upper surface of the partition wall or protrudes into the cell next to the cell to be applied, light is irradiated only to the portion to be applied, and the light is irradiated. By removing the missing parts by development, Color mixing and discharge defects can be prevented.
- the organic component containing a photosensitive compound used in the photosensitive phosphor paste includes a photosensitive component selected from at least one of a photosensitive polymer, a photosensitive monomer, and a photosensitive oligomer. It is a component to which additives such as a photopolymerization initiator, a photosensitizer, and an ultraviolet light absorber are added according to the amount.
- a paste having a composition comprising 15 to 60 parts by weight of an organic component, 40 to 85 parts by weight of a phosphor powder, and 10 to 50 parts by weight of a solvent is used for uniformity of thickness, This is effective in improving the turn formation.
- the amount of the organic component containing the photosensitive compound used in the present invention is preferably 15 to 60% by weight. If the amount is less than 15% by weight, the pattern property is deteriorated due to insufficient light exposure, and if the amount is more than 60% by weight, the binder removal property at the time of firing is poor and the firing tends to be insufficient.
- the photosensitive component used in the present invention includes a photo-insoluble type and a photo-solubilized type.
- a photo-insolubilized type As the photo-insolubilized type,
- (A) contains a functional monomer, oligomer, or polymer having at least one unsaturated group in the molecule,
- (C) There is a so-called diazo resin such as a condensate of a diazo amine and formaldehyde.
- the photosensitive component used in the present invention all of the above can be used, but the photosensitive component (A) is particularly preferred. Further, in the present invention, inorganic fine particles can be mixed with the photosensitive paste and used simply.
- the photosensitive monomer is a compound containing a carbon-carbon unsaturated bond.
- an unsaturated acid such as an unsaturated carboxylic acid
- an unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, pinylacetic acid, and acid anhydrides thereof.
- binder examples include polyvinyl alcohol, polyvinyl butyral, methacrylate polymer, acrylate ester polymer, acrylate-methacrylate copolymer, monomethylstyrene polymer, and butyl methacrylate resin.
- an oligomer or polymer obtained by polymerizing at least one of the compounds having a carbon-carbon double bond described above can be used.
- these monomers can be copolymerized with other photosensitive monomers such that the content of these monomers is at least 10% by weight, more preferably at least 35% by weight.
- the developability after exposure can be further improved by copolymerizing an unsaturated acid such as an unsaturated carboxylic acid.
- unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, and acid anhydrides of these.
- the acid value (AV) of the polymer or the oligomer having an acidic group such as a hydroxyl group in the side chain is preferably 50 to: L80, more preferably. Ranges from 70 to 140. When the acid value exceeds 180, the allowable development range becomes narrower. When the acid value becomes less than 50, the solubility of the unexposed portion in the developer decreases, so the developer concentration is increased. As a result, peeling occurs up to the exposed portion, and it is difficult to obtain a high-definition pattern.
- photoreactive group by adding a photoreactive group to a side chain or a molecular terminal to the above-mentioned polymer or oligomer, it can be used as a photosensitive polymer having a photosensitivity.
- Preferred photoreactive groups are those having an ethylenically unsaturated group. Examples of the ethylenically unsaturated group include a vinyl group, an aryl group, an acryl group, and a methylacryl group.
- a method for adding such a side chain to an oligomer or a polymer includes, for example, an ethylenically unsaturated compound, acrylic acid, having a glycidyl group, a di-succinate group, and a mercapto group, an amino group, a hydroxyl group, or a carboxyl group in a polymer.
- chloride, methacrylic chloride or aryl chloride is subjected to an addition reaction.
- Examples of the ethylenically unsaturated compound having a glycidyl group include daricidyl acrylate, glycidyl methacrylate, aryl glycidyl ether, glycidyl ethyl acrylate, crotonyl glycidyl ether, glycidyl crotonate, and glycidyl crosidonic acid. Ether and the like.
- Examples of the ethylenically unsaturated compound having an isocyanate group include (meth) acryloyl isocyanate and (meth) acryloyl ethyl isocyanate.
- the ethylenically unsaturated compounds having a glycidyl group dissionate group, acrylic acid chloride, methacrylic acid chloride or aryl chloride are considered to be 0 to mercapto group, amino group, hydroxyl group and hydroxyl group in polymer. It is preferable to add 0.5 to 1 molar equivalent.
- photopolymerization initiator examples include benzophenone, methyl o-benzoylbenzoate, 4,4-bis (dimethylamine) benzophenone, 4,4-bis (getylamino) benzophenone, and 4,4-dichlorobenzobenzoenone , 4-Benzyl-14-Methyldiphenylketone, Dibenzylketone, Fluorenone, 2,2-Diethoxyacetophenone, 2,2-Dimethoxy1-2-Fenyl-2, Phenylacetophenone, 2-Hydroxyxy 2-methylpropiophenone, p—t— Butyldichloroacetophenone, thioxanthone, 2-methylthioxanthone, 2-chlorothioxanthone, 2-isopropylthioxanthone, dimethylthioxanthon, benzyl, benzyldimethylketanol, benzylmethoxethylacetal, benzoin
- the photopolymerization initiator is added in an amount of preferably from 0.1 to 6% by weight, more preferably from 0.2 to 5% by weight, based on the photosensitive component. If the amount of the polymerization initiator is too small, the sensitivity to light becomes low. If the amount of the photopolymerization initiator is too large, the residual ratio of the exposed portion may be too small.
- an ultraviolet absorber to the photosensitive paste.
- a high aspect ratio, high definition and high resolution can be obtained by adding a light absorbing agent having a high ultraviolet absorption effect.
- the ultraviolet absorbent those composed of organic dyes, among which organic dyes having a UV absorption coefficient in the wavelength range of 350 to 450 nm are preferably used. It is. Specifically, azo dyes, aminoketone dyes, xanthene dyes, quinoline dyes, aminoketone dyes, anthraquinone, benzophenone, diphenylcyanoacrylate, triazine, p-aminobenzo Acid dyes and the like can be used.
- the organic dye is preferable since it does not remain in the insulating film after firing even when added as a light absorbing agent, and the deterioration of the insulating film characteristics due to the light absorbing agent can be reduced.
- azo and benzophenone dyes are particularly preferred.
- the amount of the organic dye added is preferably 0.05 to 5% by weight. If the amount of the organic dye is small, the effect of adding the ultraviolet absorber is reduced. If the amount is too large, the properties of the insulating film after firing are deteriorated.
- the addition amount of the organic dye is more preferably 0.15-1% by weight.
- An example of a method for adding an ultraviolet light absorber composed of an organic pigment is a method in which a solution in which an organic pigment is dissolved in an organic solvent in advance is prepared, and then glass powder is mixed in the organic solvent and then dried. By this method, a so-called capsule-like powder in which the surface of each glass powder is coated with an organic film can be produced.
- the sensitizer is added to improve the sensitivity of the photosensitive paste.
- Specific examples of the sensitizer include 2,4-bisethylthioxanthone, isopropylthioxanthone, 2,3-bis (4-ethylethylaminobenzal) cyclopenone, 2,6-bis (4-dimethyla) Minobenzal) cyclohexanone, 2,6-bis (4-dimethylaminobenzal) -14-methylcyclohexanone, Michler's ketone, 4,4-bis (getylamino) monobenzophenone, 4,4-bis (dimethylamino) power 4,4-Mono-bis (getylamino) chalcone, p-Dimethylaminocinnamilidene Indanone, p-Dimethylaminobenzylidene Indanone, 2- (p-Dimethylaminophenyvinylinylene) monoisonaphthothiazole, 1 ,
- the present invention one or two of these are used.
- the above can be used.
- Some sensitizers can also be used as photopolymerization initiators.
- the amount thereof is usually 0.05 to 10% by weight, more preferably 0.1 to 10% by weight, based on the photosensitive component. It is. If the amount of the sensitizer is too small, the effect of improving the photosensitivity is not exhibited, and if the amount of the sensitizer is too large, the residual ratio of the exposed portion may be too small.
- the photosensitive phosphor paste is usually prepared by mixing various components of a phosphor powder, an ultraviolet absorber, a photosensitive polymer, a photosensitive monomer, a photopolymerization initiator, and a solvent so as to have a predetermined composition, and then three rollers. It is prepared by mixing and dispersing homogeneously with a kneader.
- the viscosity of the paste is appropriately adjusted by the addition ratio of the phosphor powder, the organic solvent, the plasticizer, the suspending agent, etc., but the range is preferably 2 to 50 Pas, more preferably. Is 5 to 20 Pa ⁇ s.
- FIG. 1 shows a state in which a phosphor paste is discharged from a discharge port of a base and applied between partition walls of a substrate provided with electrodes, dielectrics, and partition walls.
- FIG. 2 is a drawing prepared for explaining such a positional relationship between the substrate and the base, and is more useful for understanding the present invention described below.
- a discharge port for discharging the above-mentioned phosphor paste As a discharge port for discharging the above-mentioned phosphor paste, a nozzle having a discharge hole and a nozzle at the tip, a metal, ceramics, or plastic base having 21 dollars can be used.
- a discharge hole having a hole diameter (inner diameter) of 10 to 500 111 can be used, and a preferable hole diameter is 50 to 500 m. If the pore size is smaller than 10 ⁇ , clogging with the phosphor powder is likely to occur, and if the pore size is larger than 500, the phosphor paste leaks into the adjacent cell during application to high definition. There is a problem of getting out. Further, when the distance (S) between the adjacent partition walls and the average pore diameter (D) of the discharge port satisfy the following expression, the adhesion of the phosphor paste on the upper portions of the partition walls can be further suppressed.
- the number of discharge ports can be 1 to 600 holes, but preferably 20 to 2000 holes. If the number of outlets is small, it takes too long to apply You. Desirably, when the number is 150 or more, a phosphor layer corresponding to a high-definition PDP can be formed in a short time. If the number of holes exceeds 2000, it will be difficult to ensure the processing accuracy of the discharge port, and it will be difficult to support a high-definition PDP. Further, by setting the number of discharge ports in the range of 16 n ⁇ 5 (n is a natural number), it becomes easy to form a phosphor layer on a PDP that can be driven by a general-purpose circuit.
- the pitch of the discharge ports is preferably 0.12 to 3 mm. If it is less than 0.12 mm, the distance between the discharge ports becomes small, making it difficult to produce a die.If it is more than 3 mm, it is applied to a glass substrate on which partition walls are formed at a pitch of 300 or less. In such a case, application control becomes difficult. Also, by setting the pitch of the discharge ports to be 3 m times the partition wall pitch (m is an integer of 1 to 10), the coating can be performed accurately and efficiently. Furthermore, the use of a base that satisfies the following formula for the length (L) of the discharge port and the average hole diameter (D) of the discharge port will improve the discharge performance of the paste.
- the paste discharge amount can be kept constant, and a stable coating thickness can be obtained.
- the phosphor paste can be applied by moving the base and the substrate relative to the partition on the substrate while discharging the paste from the discharge port.
- the base may be run with the substrate fixed, or the base may be run with the base fixed. Alternatively, both may be run at the same time.
- the inside of the base is kept in a negative pressure state, so that the paste can be applied without dripping at the application end portion and without variation in the applied thickness. Also, the discharge of the phosphor paste is started after the relative movement is started in parallel with the base and the partition on the glass substrate, and the discharge is stopped before the end of the relative movement. Variation in thickness can be suppressed.
- the distance between the tip of the discharge port and the upper end of the partition formed on the glass substrate in the case of discharging is preferably 0.01 to 2 mm, more preferably 0.05 to 0.5 mm.
- the distance is preferably at least 0.01 mm, more preferably at least 0.05 mm.
- the interval is preferably 2 mm or less, more preferably 0.5 mm or less.
- a uniform thickness can be applied by moving a plurality of bases at the same speed.
- a single base can discharge phosphor paste of three colors. In this case, by setting the shortest interval between the discharge ports for discharging the phosphor pastes of different colors to be equal to or more than 600, it is possible to prevent color mixing of the R, G, and B phosphors.
- a phosphor layer is formed on a high-definition partition wall
- color mixing can be prevented by applying each color and passing through a drying process each time one color is applied.
- water, an organic solvent, organic components, and the like are removed by evaporation or decomposition using a heating step such as a drying step and a baking step to obtain a fluorescent substance.
- a body layer can be formed.
- drying is usually performed with the phosphor-coated surface up, but drying may be performed with the phosphor-coated surface down.
- the phosphor-coated surface facing down, the phosphor paste is transmitted along the side wall of the partition wall, so that a phosphor layer can be formed on the side wall of the partition wall.
- the phosphor formed through the coating process is effective for removing the phosphor formed on an unnecessary portion such as the upper part of the partition.
- the photosensitive phosphor paste of each color of R GB from the discharge port and applying it After applying the photosensitive phosphor paste of each color of R GB from the discharge port and applying it, it is exposed through a photomask, and the paste in the exposed part is solubilized or insoluble in the developing solution. Unnecessary portions can be removed in the developing step to form a phosphor layer.
- An organic solvent in which the organic components in the photosensitive paste can be dissolved can be used for the developer. In addition, water may be added to the organic solvent as long as the dissolving power is not lost.
- development can be performed with an aqueous alkali solution.
- alkaline aqueous solution a metallic alkaline aqueous solution such as sodium hydroxide / calcium hydroxide aqueous solution can be used, but the use of an organic alkaline aqueous solution makes it easier to remove the alkaline component during firing. I like it.
- an amine compound can be used as the organic alkali.
- the amine compound include tetramethylammonium hydroxide, trimethylbenzylammonium hydroxide, monoethanolamine, and diethanolamine.
- the concentration of the alkaline aqueous solution is usually from 0.01 to 10% by weight, more preferably from 0.1 to 5% by weight. If the alkali concentration is too low, unexposed portions are not easily removed, and if the alkali concentration is too high, the pattern portion may be peeled off and the exposed portion may be corroded, which is not preferable.
- the development temperature during the development is preferably 20 to 50 in view of the process control.
- the thickness of the phosphor layer is determined by the following relationship between the thickness of the phosphor layer (at half the height of the partition wall) (T 1) and the thickness of the bottom (T 2). An excellent plasma display can be manufactured.
- T1 or ⁇ 2 is less than 10 m, it is difficult to obtain sufficient luminance because ultraviolet light generated by the discharge passes through the phosphor layer, and if it exceeds 50 zzm, the discharge voltage The problem such as becoming high comes out. Further, the relationship between T 1 and T 2 preferably satisfies the following expression.
- the display screen tends to have a viewing angle dependency, and there is a problem in increasing the size of the screen.
- the phosphor component is removed by firing in a firing furnace to form the phosphor layer.
- the firing atmosphere and temperature vary depending on the type of paste substrate, but firing in an atmosphere of air, nitrogen, hydrogen, etc. ⁇ The firing temperature is preferably 300 to 55 ° C., and more preferably. Is 350 to 500 ° C.
- the phosphor adheres to the upper surface of the partition wall, when the cell is sealed together with the front panel, the cells may not be sufficiently partitioned by the partition wall, causing discharge leakage.
- a method of removing by attaching to an adhesive body can be used.
- the temperature In order to completely remove organic components, the temperature must be raised to 300 ° C, preferably 350 ° C. The temperature is preferably set to 500 ° C or lower.
- a batch type firing furnace / a belt type or a roller hearth type continuous firing furnace can be used.
- the substrate on which the phosphor layer is formed in this way is sealed together with the front and rear glass substrates.
- a discharge sustaining electrode composed of ITO and bus electrodes, a dielectric composed of a glass layer, and a protective film (usually magnesium oxide) for protecting the dielectric from discharge are formed on the front plate.
- a filter, black matrix, and black stripe are formed on the front panel.
- a rare gas such as helium, neon, or xenon is filled between the front panel and the rear panel to produce a panel portion of the plasma display.
- a plasma display can be manufactured by mounting a driving driver IC. By driving the electrodes on the front panel and the rear panel in a matrix, display can be performed.
- the plasma display manufacturing apparatus of the present invention has a table on which a substrate having a plurality of partitions formed thereon is placed, and a plurality of discharge ports corresponding to the partition arrangement in which a phosphor paste is formed in a stripe shape between the partitions on the substrate.
- An apparatus provided with a base having the following can be used.
- FIG. 3 is an overall perspective view of a plasma display manufacturing apparatus according to an embodiment of the present invention
- FIG. 4 is a schematic view of a table 6 and a base 20 around FIG. It is a figure for explaining.
- a pair of guide groove rails 8 is provided on the base 2, and the table 6 is arranged on the guide groove rails 8.
- the table 6 is provided with a plurality of suction holes 7, and the substrate 4 having partition walls with a fixed pitch is fixed to the surface of the table 6 by vacuum suction.
- the board 4 is moved up and down on the table 6 by lift pins (not shown). Further, the table 6 can reciprocate in the X-axis direction on the guide groove rail 8 via the slide legs 9.
- a feed screw 10 constituting a feed screw mechanism extends through a nut-shaped connector 11 fixed to the lower surface of the table 6. Both ends of the feed screw 10 are rotatably supported by bearings 12, and one end of the feed screw 10 is connected to an AC servo motor 16.
- a base 20 for discharging a phosphor paste is connected to an elevating mechanism 30 and a width direction moving mechanism 36 via a holder 122.
- the elevating mechanism 30 includes an elevating bracket 28 that can move up and down.
- the elevating bracket 28 is attached to a pair of guide rods inside the casing of the elevating mechanism 30 so as to be able to move up and down.
- a feed screw (not shown) composed of a pole screw is also rotatably arranged between the guide rods, and moves up and down via a nut-type connector.
- an AC support (not shown) is connected to the upper end of the feed screw (not shown), and the lifting bracket 28 can be arbitrarily moved up and down by rotation of the AC support motor. .
- the elevating mechanism 30 is connected to the width direction moving mechanism 36 via a Y-axis moving bracket 32.
- the width direction moving mechanism 36 moves the Y axis moving bracket 32 to the Y axis direction. Is moved reciprocally. Guide rods, feed screws, nut type connectors, AC servo motors, etc. necessary for operation are arranged in the casing in the same manner as the lifting mechanism 30.
- the width direction moving mechanism 36 is fixed on the base 2 with the support 34.
- the base 20 can be freely moved in the Z-axis and Y-axis directions.
- the base 20 extends horizontally in the direction orthogonal to the reciprocating direction of the table 6, that is, in the Y-axis direction.
- the holder 22 that directly holds the base 20 rotates in the lifting bracket 28. It is freely supported and can rotate freely in the direction of the arrow in FIG. 3 in a vertical plane.
- the horizontal bar 24 located above the holder 22 is also fixed to the lifting bracket 28. At both ends of the horizontal bar 24, electromagnetically operated linear actuators 26 are attached.
- the linear actuator 26 has telescopic rods 29 protruding from the lower surface of the horizontal bar 24, and the telescopic rods 29 contact both ends of the holder 122 to reduce the rotation angle of the holder 122. As a result, the inclination of the base 20 can be arbitrarily set.
- an inverted L-shaped sensor support 38 and a camera support 70 are fixed on the upper surface of the base 2.
- a height sensor 40 for measuring the height of the upper end of the partition on the surface of the substrate 4 on the table 6 is attached to the tip of the sensor support 38.
- a position sensor 66 is attached via a sensor bracket 64, and the position sensor 66 is attached to the table 6 on the lower end surface where the discharge port of the base 20 is provided. The vertical position with respect to.
- a camera 72 for detecting a partition on the surface of the substrate 4, a position between the partitions, or an origin mark other than the partition is attached.
- the camera 72 is electrically connected to the image processing device 74, and the camera 72 allows the position of the partition walls of the substrate 4, the position between the partition walls, the number between the partition walls, and the origin.
- the position of the mark can be determined quantitatively.
- the base 20 has a manifold 41, and the phosphor paste 42 is filled in the manifold 41, and the phosphor paste 42 is discharged from the discharge port 44.
- the supply hose 46 is connected to the base 20, and the electromagnetic switching valve for discharge 48, supply Unit 50, suction hose 52, electromagnetic switching valve 54 for suction, and phosphor paste tank 56 are connected.
- Phosphor paste 42 is stored in the phosphor paste tank 56.
- the supply unit 50 includes a constant volume pump such as a piston and a diaphragm, a tubing pump, a gear pump, a mono pump, and a pressure feed controller for extruding a liquid by gas pressure.
- a constant volume pump such as a piston and a diaphragm
- a tubing pump such as a piston and a diaphragm
- a gear pump such as a gear pump
- a mono pump such as a pressure feed controller for extruding a liquid by gas pressure.
- Cap 20 can be supplied.
- the supply device controller 58 is further electrically connected to the overall controller 60.
- the overall controller 60 includes a motor controller 62, an electric input of a height sensor 40, an image processor 74 of a camera 72, an actuator 76 for a lifting mechanism, and an actuator 76 for a width-direction moving mechanism. All control information such as the information from 78 is electrically connected, so that the entire sequence control can be controlled.
- Whole controller 60 may be any mechanism having a control function, such as a computer or a sequencer.
- the motor controller 62 also receives signals from the AC servomotor 16 that drives the table 6, signals from the AC support motors of the elevating mechanism 30 and the widthwise moving mechanism 36, and the position of the table 6.
- a signal from the position sensor 68 for detecting the position, a signal for detecting the operating position of the base 20, and a signal from each linear sensor (not shown) of the axis ⁇ are inputted.
- an encoder may be incorporated in the AC servo unit 16 and the position of the table 6 may be detected based on a pulse signal output from the encoder.
- the table 6 and the base 20 are respectively moved to the standby positions.
- the phosphor paste has already been filled from the phosphor base tank 56 to the base 20 and the discharge electromagnetic switching valve 48 is open, and the suction electromagnetic switching valve 54 is closed. It is in the state of.
- the table in Table 6 The lift bin (not shown) rises on the surface, and the substrate 4 is mounted on the top of the foot pin from a loader (not shown).
- the lift pins are lowered, and the substrate 4 is placed on the upper surface of the table.
- the substrate 4 is vacuum-sucked.
- the table 6 moves until the partition of the substrate 4 comes under the camera 72 and the height sensor 141, and then stops.
- the position of the camera 72 is adjusted in advance so that the end of the partition wall on the substrate 4 positioned on the table 6 is projected. Find the distance from the point.
- the distance between the reference point of the camera 72 and the discharge port 44 located at the end of the base 20 at the predetermined Y-axis coordinate position is measured at the time of advance adjustment, and the information is used as information for the entire controller 6. Entered as 0. Therefore, when the distance between the camera reference point and the partition is transmitted to the image processing apparatus 7, the Y-axis coordinate value at which the discharge hole 44 at the end of the base 20 is located above the partition at the end of the partition is calculated.
- the camera 72 detects an origin mark other than the partition on the substrate 4.
- the distance between the camera reference point and the discharge port 44 located at the end of the base 20 and the distance between the origin mark and the end between the partition walls to be coated are measured at the time of advance adjustment, and the information is used as information by the general controller 6. Entered as 0. Therefore, when the distance between the camera reference point and the origin mark is transmitted to the image processing device 74, the base 20 is moved to the position to be coated.
- the phosphor paste is discharged from the base 20 on a smooth substrate having a flat surface, and the stripe of the phosphor paste is measured.
- the absolute position may be obtained by measuring the position of this stripe by detecting the position by image processing.
- the position of the discharge port of the base 20 can be known, and as a result, the absolute position of the base can be obtained.
- the height sensor 40 detects the vertical position of the upper end of the partition wall of the substrate 4 and The height of the upper end of the partition wall of the substrate 4 is calculated from the difference in position from the upper surface.
- the height of the base 20 should be lowered on the Z-axis linear sensor by adding the distance from the discharge port of the base 20 previously given to the upper end of the partition wall of the substrate 4 to this height. Calculate the value and move the base 20 to that position.
- the distance from the discharge port of the base 20 important for coating to the upper end of the partition wall of the substrate 4 is always maintained. You can keep it constant.
- the height sensor 40 to which the present invention can be applied is based on a principle capable of measurement, such as a non-contact measurement type using a laser or an ultrasonic wave, and a contact measurement type using a dial gauge or a differential transformer. Any material may be used.
- the table 6 is moved toward the base 20 to start the operation, and the table 6 is increased to a predetermined application speed before the application start position of the substrate 4 reaches below the discharge port of the base 20. Keep it fast.
- the distance between the operation start position and the dispensing start position of the table 6 must be sufficient to allow the table 6 to increase to the dispensing speed.
- a position sensor 168 for detecting the position of the table 6 is arranged so that the coating start position of the substrate 4 reaches below the discharge port of the base 20, and the table 6 is located at this position.
- the operation of the supply unit is started, and the supply of the phosphor paste 42 to the base 20 is started. The same can be done by connecting an encoder to the motor or feed screw instead of the position sensor 168, and detecting the position by the encoder value.
- the application of the phosphor paste is performed until the position where the application of the substrate 4 is completed is near the bottom of the discharge port of the base 20. That is, since the substrate 4 is always placed at the predetermined position on the table 6, the position sensor 1 and its encoder are located at the position of the table 6, which corresponds to the position where the coating end position of the substrate is just below.
- the values are set in advance, and when the table 6 comes to the corresponding position, a stop command is issued from the general controller 60 to the supply device controller 58 to stop the supply of the phosphor paste 42 to the base 20. . At this time, the base 20 may be raised to completely supply the phosphor base.
- the phosphor paste 42 is a relatively high-viscosity liquid, simply stopping supply of the paste will cause the discharge from the outlet of the base 20 to be instantaneous due to the effect of residual pressure. It's hard to stop. Therefore, when the supply of the phosphor base 42 is stopped, the pressure of the manifold 41 of the base 20 is set to the atmospheric pressure, or the pressure of the manifold 41 is set to the negative pressure. By sucking the phosphor paste from the discharge port of the base 20, discharge of the phosphor paste from the discharge port can be stopped in a short time.
- the pump when a pump is used for the supply unit 50, the pump may be operated in reverse, that is, in the direction of sucking the phosphor paste. In the case of feeding, the pressure of the manifold 41 may be reduced to a negative pressure by connecting a vacuum source to the supply unit 50.
- an electromagnetic switch connected to a vacuum source between the discharge electromagnetic switching valve 48 and the base 20 or to the base 20 itself.
- a vacuum source there is a vacuum pump, a vacuum pump, and a pump that reverses a piston type pump. The timing of these pressure adjustments can be controlled by the supply device controller 58 and the overall controller 60.
- Table 6 continues its operation even after passing the dispensing end position, and stops when it reaches the end point position. At this time, if there is still a portion to be applied, move the base 20 in the Y-axis direction to the next start position to apply, and then move the table 6 in the opposite direction. Is applied in the same procedure. When dispensing in the same movement direction of the table 6 as the first time, the base 20 is moved in the Y-axis direction to the next start position to be applied, and the table 6 is returned to the X-axis preparation position.
- the table 6 is moved to the place where the substrate 4 is transferred by the unloader and stopped, and the lift pins are lifted after releasing the suction of the substrate 4 and releasing the air to the atmosphere. Then, the substrate 4 is separated from the surface of the table 6 and lifted.
- the lower surface of the substrate 4 is held by an unloader (not shown), and the substrate is transported to the next step.
- the table 6 lowers the lift pins and returns to the home position.
- the discharge electromagnetic switching valve 48 is closed, the suction electromagnetic switching valve 54 is opened, and the supply unit 50 is operated to apply one substrate from the phosphor paste tank 56.
- the phosphor paste 42 is supplied to the base 20 in an amount necessary for the above.
- the timing of starting the supply of the phosphor paste to the die 20 with respect to the coating start position, and the fluorescent light to the die 20 with respect to the coating end position are described.
- the supply of the phosphor paste 42 is started after the distance between the discharge port of the base 20 and the upper end of the partition wall of the substrate 4 is set. This is because when the supply of the phosphor paste 42 is started before the interval between the two is set, when the phosphor paste 42 is discharged from the discharge port, it spreads to the front end face of the discharge port, and the discharge port This is because the other parts are contaminated, and in severe cases, there is a disadvantage that the phosphor pastes 42 discharged from the adjacent discharge ports are merged, so that highly accurate coating cannot be performed.
- the supply of the phosphor base 42 is started after the tip end surface of the base 20 is close to the substrate 4, the phosphor paste 42 is placed between the partition walls before the phosphor paste 42 spreads on the tip surface. Such a problem does not occur.
- the application example in which the substrate 4 moves in the X-axis direction and the base 20 moves in the Y-axis and Z-axis directions has been described.
- the table and the base can be moved in any manner as long as they can be moved in a dimension.
- the present invention can also be applied to the case where phosphors of three colors such as red, blue and green are applied simultaneously. .
- FIG. 5 and FIG. 6 are schematic perspective views illustrating a base used in the present invention.
- holes having a predetermined pitch are provided as discharge ports 501 in a flat surface.
- the discharge port may be constituted by arranging pipes 60 1 having the same shape as shown in FIG. 6, and this is preferable because the base is less likely to be stained.
- outlets of the base have their respective centers where the phosphor paste is applied.
- it is arranged to be located above between the walls.
- the average hole diameter of the discharge port of the base is 10 m or more and 500 m or less, and is equal to or less than the interval between the partition walls, thereby preventing color mixture with an adjacent color.
- the shape of the outlet of the base is not circular, and the opening length substantially perpendicular to the partition may be 10 m or more and 500 m or less, and may be smaller than the interval between the partitions.
- the shape of the discharge port at this time includes a long hole, an ellipse, and a rectangle.
- a coating of a fluororesin such as polytetrafluoroethylene on the discharge port surface and / or the inner wall of the discharge port of the base, the phosphor paste on the discharge port surface and the inner wall of the discharge port is separated. The moldability is improved, and the discharge port surface can be prevented from being stained.
- amorphous carbon film (DLC) on the discharge port surface and / or the inner wall of the discharge port of the base, the surface hardness of the discharge port surface and the inner wall of the discharge port is improved, and the wear resistance is improved. Is improved.
- DLC amorphous carbon film
- FIG. 7 is a cross-sectional view and a bottom view showing an example of another base according to the present invention.
- One base has a plurality of phosphor paste storage units 704, 705, and 706, and a phosphor that supplies the phosphor paste to the phosphor paste storage units 704, 705, and 706 Pass section that fluidly connects the paste supply ports 7 0 1, 7 0 2, 7 0 3 with the storage sections 7 04, 7 0 5, 7 0 6 and the discharge ports 7 10 0, 7 1 1, 7 1 2 707, 708, 709.
- different types of phosphor paste can be discharged from one base.
- the shortest distance between the discharge ports for discharging the phosphor pastes of different colors to be 600 m or more, it is possible to prevent color mixture with other colors.
- FIG. 8 is a schematic perspective view for explaining a main part of a plasma display manufacturing apparatus according to another embodiment of the present invention. Not only one base but two or more bases may be arranged in the Y direction.
- the bases 801, 802 are driven by a control device (not shown) so as to be driven synchronously or asynchronously in both the X and Y directions. In this way, the application of the phosphor paste to the substrate 4 on the table 6 is shared by the two or more bases, so that the application time can be reduced.
- a base that discharges a phosphor paste that emits the same color a base that discharges a phosphor paste that emits a different color, or a light that emits two or more different colors
- Any of bases for discharging the phosphor paste may be used.
- the position of two or more adjacent bases is ⁇ displaced '' ⁇ When the outer dimension J of the base body is However, it is efficient and preferable to dispose them so as to be displaced in parallel to the partition walls.
- FIG. 9 is a schematic side view illustrating a device for cleaning a discharge port surface of a base.
- the cleaning device 901 is arranged at a position where the wiping member 903 comes into contact with the discharge port surface 902 of the base 20.
- the wiping member 903 has a shape surrounding the distal end portion of the discharge port surface, but may have a shape that contacts only the discharge port surface 902.
- the wiping member 903 is fixed to a bracket 904 attached to the tray 905, and moves in the width direction (Y-axis direction) together with the tray 905.
- the phosphor paste attached to the discharge port surface is scraped off.
- the scraped phosphor paste is guided from the discharge port 906 to a waste liquid tank (not shown) via a tube 907 connected thereto.
- the wiping member 903 is located on the right side of the opening of the base 20 when the tray 905 reaches the rightmost end in FIG. 9, and the phosphor paste discharged from the base 20 is It is located at a location where it cannot be reached.
- the tray 905 has such a size that all the phosphor paste discharged from the base 20 can be collected.
- the tray 905 is connected to the lifting unit 908.
- the elevating unit 908 is moved up and down along the guide 909 by the air cylinder (not shown) in the vertical direction on the moving unit 910.
- the wiping member 903 is at the lowest point and does not contact the discharge port surface 902 of the base 20 at a certain distance.
- Rise The descending portion 908 is adjusted so that the wiping member 903 rises to the point when the wiping member 903 comes into contact with the discharge port surface 902 of the base 20.
- the moving unit 9110 is driven by a pole screw 912 along a guide (not shown) on the gantry 911 and moves in the width direction.
- the ball screw 912 is connected to a not-shown support, and an arbitrary operation can be performed by this operation control.
- the material of the wiping member 903 may be any material, but is desirably resin or rubber so as not to damage the outlet face of the base, and if it is selected in consideration of the chemical resistance to the phosphor paste from among them. Good.
- the application sequence using this wiping device 9 01 is as follows. First, with the wiping member 903 at the lowest point, move the tray 905 under the base 20 and operate the phosphor paste supply device to remove the phosphor paste from the base 20. Bleed by discharging. After the bleeding is completed, the elevating unit 908 is raised to bring the wiping member 903 into contact with the discharge port surface 902 of the base 20. Next, by driving an unillustrated cover, the wiping member 903 is moved to the left in FIG. 8 in the width direction, and the phosphor paste adhering to the outlet surface 902 is wiped off and removed. I do. Next, the base 20 is moved to a predetermined position, and the phosphor paste is applied between the partition walls.
- the wiping operation described above may be performed, or the wiping operation may be performed after several application operations.
- the timing at which the wiping operation is performed depends on the degree of adhesion of the phosphor paste to the discharge port surface 102.
- the coating operation can be performed with the discharge port surface of the base always being cleaned, so that unnecessary phosphor paste adheres to the upper end of the partition wall of the substrate, or the gap between the partition walls to be coated can be removed. Inconveniences such as the phosphor paste being applied between the adjacent partitions can be prevented, and the phosphor paste can be uniformly and stably applied between the partitions.
- a means for removing the phosphor paste other than a predetermined application position for example, when the phosphor paste adheres to the upper end of the partition.
- a spatula As a means to remove the phosphor paste, use a spatula to remove There are means to remove by contacting the upper end, or by blowing compressed air with an air nozzle.
- the material of the adhesive is not particularly limited as long as it has the above-mentioned characteristics, and examples thereof include polyurethane rubber, polyethylene rubber, silicone rubber, and gel bodies thereof.
- the configuration of the pressure-sensitive adhesive body made of the above-mentioned viscous substance is not particularly limited, but it is preferable that the pressure-sensitive adhesive body be a belt or a mouth having a shape that comes into contact with the surface of the substrate.
- the belt may contact the substrate being transported while rotating between the feed roll and the take-up roll. The contact makes it possible to adhere and remove the phosphor paste on the top of the partition wall of the substrate.
- Thickness distribution (difference between maximum thickness and minimum thickness when measured at 9 points)
- Photosensitive silver paste is screen-printed with a thickness of 5 m on the entire surface of a soda glass substrate with a width of 34 Omm X depth 44 Omm X thickness 2.8 mm, and then a photomask is used. Exposure was performed, followed by development and firing steps, to form 192 silver strips with a pitch of 220 m. A glass paste made of glass and a binder was screen-printed on the electrode, and then fired to form a dielectric layer. Next, a photosensitive glass paste comprising a glass powder and a photosensitive organic component was screen-printed to a thickness of 200 jum and dried. Next, exposure and development and baking are performed using a photomask designed to form a partition wall between adjacent electrodes. Thus, a partition was formed. The partition walls had a pitch of 220 m, a line width of 30 m, and a height of 130 / m, and the number of partition walls was 1921.
- a phosphor paste having the following composition was applied to the glass substrate on which the partition walls were formed as described above, using the apparatus shown in FIG.
- Phosphor paste 40 g of each of the following phosphor powders was mixed with 10 g of ethyl cellulose, 10 g of terbineol, and 40 g of benzyl alcohol, and then kneaded with three ceramic rollers. As a result, phosphor pastes for each of the RGB colors were produced.
- the viscosities of the obtained phosphor pastes were red 14 Pa's, green 18 Pa's, and blue 15 Pa's, respectively.
- the base used for applying the phosphor paste was a base with 64 holes with an average diameter of 150 zm of the discharge port formed at a pitch of 660 ⁇ m, and the length of the discharge port was 2 mm.
- One base was used.
- the coating was performed with the distance between the upper end of the partition wall formed on the glass substrate and the tip of the outlet of the base maintained at 0.1 mm.
- the coating was performed by applying pressure to the base filled with the phosphor paste to perform continuous discharge, and moving the base parallel to the partition wall at a speed of 50 mm / sec.
- the substrate coated with the RGB phosphor paste was fired at 460 ° C. for 15 minutes, and then evaluated. Table 1 shows the evaluation results.
- a phosphor layer was formed in the same manner as in Example 1 except that the number of bases was changed from one to two, and each base was moved and applied at 50 mm / sec. Table 1 shows the evaluation results.
- the number of bases was changed from one to three, and each base was filled with a phosphor base of each color of RGB and applied by discharging, and the phosphor layer was the same as in Example 1. Was formed. Table 1 shows the evaluation results.
- the phosphor layer was formed in the same manner as in Example 1, except that the number of discharge ports was changed from 64 to 640, and the application of one color phosphor paste was completed by one die movement.
- Table 1 shows the evaluation results.
- the discharge port has a hole diameter of 150 tm, and a pitch of 720 m
- the displaced amount of the die 0.36 mm—46.0 8 mm—0.36 mm—46.0 8 mm—0.36 mm—46.0 0.8 mm—0.3 6mm—46.08mm-0.36mm except that the base was moved and applied 10 times in total.
- a phosphor layer was formed in the same manner as in Example 1. Further, after the phosphor layer was fired, the roller was rolled using an adhesive roller having a width of 500 mm and a diameter of 250 mm so that the entire upper part of the partition wall was in contact with the roller. Table 1 shows the evaluation results.
- a phosphor paste was applied in the same manner as in Example 5 except that the phosphor paste was changed to a paste having the following composition, and thereafter, a pitch of 120 tm, an opening line width of 80 m. Exposure was performed using 20 photomasks. Next, it was developed with a 0.5% by weight aqueous solution of triethanolamine and then fired to form a phosphor layer. Table 1 shows the evaluation results.
- Phosphor paste 50 g of each of the following phosphor powders was added to 20 g of a binder (isobutyl methacrylate-acrylic acid 1: 1 copolymer, weight average molecular weight 24,000), 20 g of photosensitive monomer (trimethylol) After mixing 15 g of propane triacrylate, 20 g of gamma butyrolactone and 3 g of a polymerization initiator (Irgacure 907 manufactured by Ciba Geigy Co., Ltd.), the mixture was kneaded with three rollers to prepare a paste.
- a binder isobutyl methacrylate-acrylic acid 1: 1 copolymer, weight average molecular weight 24,000
- photosensitive monomer trimethylol
- the viscosity of the obtained phosphor paste was 20 Pa's for red, 32 Pa's for green, and 19 Pa-s for blue.
- the composition of the phosphor paste of Example 1 was changed to 50 g of the phosphor powder and a binder polymer (a copolymer composed of 40% methacrylic acid, 30% methyl methacrylate, and 30% styrene).
- a binder polymer a copolymer composed of 40% methacrylic acid, 30% methyl methacrylate, and 30% styrene.
- a photosensitive polymer having an average value of 43,000 and an acid value of 95
- 30 g of a solvent (acetolactone) 4 g of a dispersant.
- the viscosity of the phosphor base was 0.05 Pa * s for red, green and blue.
- the substrate was changed to a glass substrate with a pitch of 150 mm, a height of 120 xm, and a width of 200 zm with a width of 30 zm, and the base was replaced with 64 0 outlets with a hole diameter of 80 m.
- the base formed with pitch 450 and after discharging the red phosphor paste, the coated surface is dried at 80 ° C for 60 minutes, and then the green phosphor paste is discharged. After drying at 80 ° C for 60 minutes with the coated surface facing down and discharging the blue phosphor paste, drying at 80 ° C for 60 minutes with the coated surface facing down, then at 500 ° C For 30 minutes.
- Other conditions were the same as in Example 1 to form a phosphor layer. Table 1 shows the evaluation results.
- the composition of the phosphor paste was changed to a phosphor paste consisting of 50 g of phosphor powder, 40 g of binder polymer, 30 g of a solvent (peptide lactone) and 4 g of a dispersing agent.
- a phosphor paste was produced in the same manner as in Example 8, except that the viscosity of the body paste was 0.03 Pa * s for each of red, green and blue.
- the substrate was changed to a glass substrate with a pitch of 360 ⁇ m, a height of 140 m, and a width of 50 m, on which 200,000 partition walls were formed.
- a glass substrate with a pitch of 360 ⁇ m, a height of 140 m, and a width of 50 m, on which 200,000 partition walls were formed.
- the composition of the phosphor paste was as follows: 50 g of phosphor powder, 20 g of binder-polymer, 20 g of trimethylolpropane triacrylate, 30 g of a solvent (a-captyloractone) and 4 g of a dispersant, and light
- the phosphor paste made of a polymerization initiator ("Irgacure 907", Ciba-Geigy Co., Ltd.) was changed, and the viscosity of the phosphor paste was set to 0.03 Pa ⁇ s for red, green and blue.
- a phosphor layer was formed in the same manner as in Example 8 except for the above.
- a screen plate with a pitch of 360 mm and an opening of 80 wm was used on a substrate with an electrode pitch of 120 m, a partition wall pitch of 120 m, a line width of 30 mm, and a height of 90 m.
- the phosphor paste of each color of RGB was screen printed.
- the substrate was baked at 460 ° C. for 15 minutes to form a phosphor layer.
- Table 1 shows the evaluation results. Table 1. Evaluation results of phosphor layer
- a high-precision phosphor layer can be easily formed between high-definition partition walls, application development including a phosphor layer corresponding to a high-definition plasma display is possible.
- a high-quality plasma display having a wide area can be obtained.
- this plasma display is industrially advantageous because it can be manufactured continuously at a high productivity level.
- the high-definition plasma display obtained by the present invention is widely used in display fields such as wall-mounted televisions and information displays.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/125,128 US7455879B2 (en) | 1996-12-17 | 1997-12-16 | Method and apparatus for producing a plasma display |
CA002246499A CA2246499C (en) | 1996-12-17 | 1997-12-16 | Method and device for manufacturing plasma display |
DE69735666T DE69735666T2 (de) | 1996-12-17 | 1997-12-16 | Verfahren und vorrichtung zur herstellung von plasmaanzeige |
EP97947965A EP0884754B1 (en) | 1996-12-17 | 1997-12-16 | Method and device for manufacturing plasma display |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
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JP33671396 | 1996-12-17 | ||
JP8/336713 | 1996-12-17 | ||
JP9/81555 | 1997-03-31 | ||
JP8155597 | 1997-03-31 | ||
JP17236497 | 1997-06-27 | ||
JP9/172339 | 1997-06-27 | ||
JP17233997 | 1997-06-27 | ||
JP9/172364 | 1997-06-27 | ||
JP9/172354 | 1997-06-27 | ||
JP17235497A JPH1125859A (ja) | 1997-06-27 | 1997-06-27 | プラズマディスプレイパネルの製造方法 |
Publications (1)
Publication Number | Publication Date |
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WO1998027570A1 true WO1998027570A1 (fr) | 1998-06-25 |
Family
ID=27524927
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP1997/004643 WO1998027570A1 (fr) | 1996-12-17 | 1997-12-16 | Procede de fabrication d'ecran a plasma et dispositif correspondant |
Country Status (6)
Country | Link |
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US (1) | US7455879B2 (ja) |
EP (1) | EP0884754B1 (ja) |
CN (1) | CN1123040C (ja) |
DE (1) | DE69735666T2 (ja) |
ID (1) | ID21831A (ja) |
WO (1) | WO1998027570A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US7455879B2 (en) | 2008-11-25 |
DE69735666D1 (de) | 2006-05-24 |
EP0884754A1 (en) | 1998-12-16 |
EP0884754B1 (en) | 2006-04-12 |
CN1123040C (zh) | 2003-10-01 |
ID21831A (id) | 1999-07-29 |
CN1216149A (zh) | 1999-05-05 |
US20020009536A1 (en) | 2002-01-24 |
EP0884754A4 (en) | 2000-07-19 |
DE69735666T2 (de) | 2007-01-25 |
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