JP2000075473A - Phosphor pattern forming composition and method for manufacturing plasma display back plate - Google Patents

Abstract

(57) Abstract: A photosensitive phosphor paste and a PDP capable of forming a phosphor layer having a uniform thickness on the inner surface of a barrier rib.
To provide a method for manufacturing a back plate. SOLUTION: A binder resin, a photopolymerizable monomer, a photopolymerizable initiator, a phosphor and an organic solvent are kneaded, and the amount of the binder resin is reduced while maintaining a viscosity by further adding a thickener. A composition for forming a phosphor pattern, and a method for producing a PDP back plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor pattern forming composition for forming a phosphor pattern in a fluorescent display device and a plasma display panel (hereinafter referred to as PDP).
) Of the back plate.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a phosphor pattern in a fluorescent display device, a phosphor paste obtained by dispersing a phosphor in a varnish comprising a binder resin and a solvent is pattern-printed by a screen printing method or the like. There is known a method of baking to thermally decompose and remove organic substances to form a phosphor layer.

Since this method has a problem in printing accuracy, it is difficult to cope with miniaturization of the pattern of the fluorescent display device. Therefore, since a fine pattern can be easily formed, a photolithography method using a photosensitive resin has been studied. For example, Japanese Patent Application Laid-Open No. 1-115027,
JP-A-124929, JP-A-1-124930 and JP-A-4-116558 describe photosensitive phosphor paste compositions.

[0004]

When a back plate of a PDP is formed, a phosphor paste is applied so that the thickness of the phosphor layer after firing at the bottom of the cell becomes 20 to 30 μm in order to secure a discharge space. Is preferably applied. When the conventional photosensitive phosphor paste described above is used, the viscosity of the paste is low or the flowability is strong, so that the paste flows down to the cell bottom during coating and drying, and as shown in FIG. However, the light emission direction and the amount of light emission when the phosphor layer is fired to emit light as a PDP are biased, resulting in a problem on the screen display such as a narrow viewing angle. In order to solve such a bias of light emission, it is necessary to form a phosphor layer having a thickness of about the bottom at the wall surface of the barrier rib as shown in FIG. 4A. Although the details will be described later, the shape of the phosphor layer after firing with the composition of the present invention is as shown in FIG. Therefore, the object of the present invention is to
An object of the present invention is to provide a photosensitive phosphor paste capable of forming a phosphor layer having a thickness of about the bottom on the wall surface of the barrier rib, and a method of manufacturing a back plate of PDP.

[0005]

The above object is achieved by the present invention described below. That is, the present invention comprises kneading a binder resin, a photopolymerizable monomer, a photopolymerizable initiator, a phosphor and an organic solvent, and further adding a thickener to reduce the amount of the binder resin while maintaining the viscosity. A composition for forming a phosphor pattern, and a method for producing a PDP back plate.

According to the present invention, by adding a thickener to the composition, the amount of the binder resin used can be reduced without lowering the viscosity of the paste. As a result, a phosphor layer having sufficient luminance when emitted as ODP and having no discoloration can be obtained. Also, the addition of the thickener can enhance the thixotropic properties of the paste, so that a phosphor pattern having a sufficiently thick phosphor layer on the rib wall surface can be formed as shown in FIG. 4A. When the phosphor layer is formed by a coating method, a paste having a low viscosity is often required, and in the case of the conventional paste, the paste particularly easily flows down to the bottom of the cell. Since the composition of the present invention can form a phosphor pattern having a phosphor layer with a sufficient thickness on the rib wall surface as shown in FIG. Particularly, it is suitable as a photosensitive phosphor paste for coating.

[0007]

Next, the present invention will be described in more detail with reference to preferred embodiments. The binder resin used in the composition of the present invention is a cellulose derivative or an acrylic copolymer, specifically, methyl cellulose, ethyl cellulose, ethoxy cellulose, methyl hydroxyethyl cellulose, methyl hydroxypropyl cellulose, methyl hydroxypropyl cellulose phthalate, methyl hydroxypropyl cellulose. Acetate succinate,
Hydroxypropyl cellulose, cellulose propionate, acetylethyl cellulose, acetyl cellulose, butyl cellulose, benzyl cellulose and the like can be mentioned.

In particular, when patterning a phosphor layer formed from the composition of the present invention, in order to make the film developable with water, a cellulose derivative soluble in both water and an organic solvent, for example, It is preferable to select and use hydroxypropyl cellulose. Further, as the thickener used in the present invention, casein, protein system such as casein salt,
Polyvinyl alcohol, aliphatic amide, acrylic copolymer type, polyvinyl type such as polyvinyl pyrrolidone, acrylic type such as sodium polyacrylate, polyether type such as polyether dialkyl ester, vinyl methyl ether-maleic anhydride copolymer Maleic anhydrides such as partial esters, and organic thickeners such as acetylene glycol, microsilica, kaolin, bentonite,
Mention may be made of inorganic thickeners such as talc, all of which are known in the coatings art and may be obtained from the market and used in the present invention.

The above thickener is preferably used in an amount of 0.5 to 10% by weight based on 100 parts by weight of the composition. When the amount used is less than 0.5% by weight, the fluidity of the paste is strong, and the paste flows down to the bottom of the barrier ribs as shown in FIG. As shown in FIG. 4A, it is insufficient in that a phosphor layer having a desired thickness cannot be formed on the wall surface of the barrier rib. Further, when the amount used exceeds the above range, the viscosity of the phosphor paste becomes too high, or the fluidity becomes too bad, so that the unevenness of the coated surface becomes severe, and the distribution of the coated film thickness is not uniform. Occurs.

The photopolymerizable monomers used in the present invention include 2-hydroxy-3-phenoxypropyl mono (meth) acrylate, 2-hydroxyethyl (meth) acrylate, ethylene glycol mono (meth) acrylate, and cyclohexyl (meth) acrylate. Acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, dimethylaminoethyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene Glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, with bisphenol A alkylene oxide Di (meth) acrylate, trimethylolpropane tri (meth) acrylate, alkylene oxide-modified trimethylolpropane tri (meth) acrylate, pentaerythritol hydroxy tri (meth) acrylate, alkylene oxide-modified pentaerythritol hydroxy tri ( (Meth) acrylate, pentaerythritol tetra (meth) acrylate, alkylene oxide-modified pentaerythritol tetra (meth) acrylate, ditrimethylolpropanetetra (meth) acrylate, alkylene oxide-modified ditrimethylolpropanetetra (meth) acrylate, dipentaerythritol penta (meth) A) acrylate, dipentaerythritol hexa (meth) acrylate, and the like. In the present invention, one or more of these can be used.

The photopolymerizable initiator used in the present invention includes, for example, N, N'-tetramethyl-4,4'-diaminobenzophenone, N, N'-tetraethyl-4,4'-diaminobenzophenone, isopropyl Thioxanthone,
2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, benzyl, 2-ethylanthraquinone,
2,2-dimethoxy-1,2-diphenylethane-1-
On, 2-benzyl-2-dimethylamino-1- (4-
Morpholinophenyl) -butan-1-one, 2,4
6-trimethylbenzoyldiphenylphosphine oxide and the like. These photopolymerizable initiators can be used alone or in combination of two or more. A particularly preferred photopolymerizable initiator is 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1, which is represented by the following structural formula.

[0012]

[0013] The phosphor used in the present invention is not particularly limited, and a conventionally known phosphor can be used. For example, as a red phosphor, Y ₂ O ₃ : Eu, Y ₂ Si
O ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃ (PO ₄ ) ₂ : M
n, (Y, Gd) BO ₃ : EU, YO ₃ : Eu, etc., as a green phosphor, Zn ₂ SiO ₄ : Mn, BaAl ₁₂ O ₁₉ : M
n, YBO ₃ : Tb, (Ba, Sr, Mg) O · aAl ₂ O
₃ : As a blue phosphor such as Mn, Y ₂ SiO ₅ : Cl, C
aWO ₄ : Pb, BaMgAl ₁₄ O ₂₃ : Eu, BaMg
Al ₁₄ O ₂₃ : Eu, BaMgAl ₁₀ O ₁₇ : Eu and the like.

The organic solvent used in the present invention includes ethers, ether esters, esters, amides,
Examples include alcohols, ketones, acetates, ketone esters, glycols, glycol ethers, sulfones, sulfoxides, halogenated hydrocarbons and hydrocarbons.

In the composition of the present invention, by using the thickener, the amount of the binder resin used can be reduced by about 10 to 30 as compared with the conventional photosensitive phosphor paste without reducing the viscosity of the paste. % By weight, and the content of the binder resin in 100 parts by weight of the paste can be in the range of 2 to 10% by weight. As for the other components, the photopolymerizable monomer is 2 to 20% by weight, preferably 5 to 15% by weight, and the photopolymerizable initiator is 0.1 to 10% by weight, more preferably 1 to 100% by weight in 100 parts by weight of the paste. 6% by weight. The phosphor is present in a proportion of 15 to 70% by weight, preferably 30 to 60% by weight. As described above, by using the thickener, even if the viscosity is the same, the amount of the binder resin in the paste can be reduced and the content of the phosphor can be increased, and the above-described effects can be obtained.

If the amount of the photopolymerizable monomer is less than 2 parts by weight, the photocurable composition of the coating composition will be insufficient and the development resistance will be remarkably deteriorated. If the amount exceeds 20 parts by weight, the resolution of a fine image is reduced, sticking is likely to occur, it is difficult to remove the organic resin component during firing, and the brightness when the phosphor layer emits light is reduced. This is not preferable because the emission hue changes.

If the photopolymerizable initiator is less than 0.1 part by weight,
The photo-curing of the coating composition at a normal exposure dose is insufficient, so that the development resistance is remarkably reduced, and an image is eluted during development and an image cannot be formed. Further, when the photopolymerizable initiator is used in excess of 10 parts by weight because of its low solubility in a solvent, when the composition is used as a film, the photopolymerizable initiator is in a non-uniformly dispersed state, and the Fogging and stains are likely to occur in the unexposed areas of not only, it is not only impossible to form a fine image, it is also difficult to completely remove at the time of firing, the brightness when the phosphor layer emits light, or the light emission It is not preferable because the hue changes.

The phosphor is required to have a luminance of 15
It is necessary to add more than weight%. However, if the phosphor is added in an amount exceeding 70% by weight, the viscosity of the paste becomes extremely high, and the coatability deteriorates.

The suitable range of the viscosity of the phosphor paste varies depending on the method of coating, but is generally in the range of 5,000 to 5
4,000 mPa · s is appropriate. 5,000 viscosity
If it is lower than mPa · s, the phosphor layer formed between the barrier ribs has a thick bottom surface and a thin wall surface.
Conversely, if the viscosity is higher than 50,000 mPa · s, the coatability will be poor.

The amount of the organic solvent is preferably 70 to 30% by weight based on 100 parts by weight of the composition. If it exceeds 70% by weight, the viscosity becomes too low, the shape of the phosphor layer becomes thicker at the bottom and the wall becomes thinner, and if it is less than 30% by weight, the viscosity becomes too high and the coatability deteriorates.

The composition of the present invention may contain a dye, a plasticizer, a polymerization inhibitor, an adhesion-imparting agent (such as a low-melting glass, a silane coupling agent, and a metal alkoxide), an antifoaming agent, and a leveling agent, if necessary. Can be added. In particular, in the present invention, since a relatively small amount of the binder resin is used, sedimentation of the phosphor particles may become a problem, and thus it may be preferable to use a dispersant. Such dispersants can be various surfactants, but preferred specific examples are aliphatic ester-based, aliphatic amide-based, polycarboxylic acid-based, polyamide-based, polyaminoamide carboxylate and phosphate, Examples thereof include alkyl ammonium salts and polymer polyethers. When the dispersant is used, the amount of the dispersant is 0.1 to 10% by weight based on 100 parts by weight of the composition.

The method of applying the composition of the present invention includes:
Known methods can be used. Specific examples include coating methods such as knife coating, bar coating, spin coating, curtain coating, roll coating, and die coating, and screen printing methods. Of these, without mixing bubbles on the substrate with unevenness due to the barrier rib wall,
The die coating method is particularly preferable because it is necessary to apply the film thickness with extremely high precision.

The method of forming a phosphor pattern using the composition of the present invention will be described by way of an example. First, the photosensitive phosphor paste composition of the present invention is applied to a glass substrate by a die coater. The thickness of the phosphor layer after drying is 10
The coating amount is adjusted so as to be ４０40 μm, which is then heated at 80 to 120 ° C. for 20 to 40 minutes and dried.

Next, active radiation such as ultraviolet rays is selectively irradiated through a photomask having a desired pattern. For example, an ultraviolet ray of 100 to 500 mJ / cm ² is irradiated by an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and then the unexposed portion is developed and removed with a developing solution such as water or a dilute alkali to form an image. After that, air blow and drying are performed to form a phosphor screen pattern, and the process is repeated three times to form a phosphor screen of three colors of RGB, and further baked at 500 to 550 ° C. to form a phosphor screen. Obtained.

The phosphor pattern forming composition of the present invention as described above is particularly useful for producing a PDP back plate. Hereinafter, the manufacture of the PDP back plate will be described. Generally PDP
Has a structure in which a pair of electrodes arranged regularly on two opposing glass substrates are provided, and a gas mainly composed of Ne or the like is sealed between them. Then, a voltage is applied between these electrodes, and a discharge is generated in minute cells around the electrodes, so that each cell emits light and display is performed. In order to display information, regularly arranged cells are selectively caused to emit light. There are two types of PDPs, a direct current type (DC type) in which the electrodes are exposed to the discharge space, and an alternating current type (AC type) in which the electrodes are covered with an insulating layer. And a refresh driving method and a memory driving method.

FIG. 3 shows an example of the configuration of an AC type PDP. In this figure, the front plate 31 and the back plate 32 are shown separated from each other. As shown, the front plate 31 and the back plate 32 made of glass are arranged in parallel and opposed to each other. On the front side of the face plate 32, a barrier rib 33 standing upright is fixed, and the barrier rib 33 holds the front plate 31 and the back plate 32 at a constant interval. On the back side of the front plate 31, a composite electrode composed of a sustain electrode 34 which is a transparent electrode and a bus electrode 35 which is a metal electrode is formed in parallel with each other, and a dielectric layer 36 is formed so as to cover the composite electrode. , And a protective layer 37 (M
gO layer).

On the front side of the back plate 32, barrier ribs 33 are provided so as to be orthogonal to the composite electrodes, and address electrodes 38 are formed between the barrier ribs. The dielectric layer 40 is formed so as to cover the address electrode 38, and a phosphor layer 39 is provided so as to cover the wall surface of the barrier rib 33 and the cell bottom. This A
In the C-type PDP, an electric field is formed by applying a predetermined voltage from an AC power supply between the composite electrodes on the front plate 31, thereby forming an electric field.
Discharge is performed in each cell as a display element defined by the front panel 31 and the barrier rib 33 of the rear panel 32. Then, the phosphor layer 39 emits light by the ultraviolet rays generated by the discharge, and the light transmitted through the front plate 31 is visually recognized by the observer. In the present invention, the phosphor layer 39 is formed using the composition of the present invention.

Reference is made to FIGS. 1 and 2 which schematically illustrate the method of the present invention. FIG. 1A shows a state where a composition 3 for forming a phosphor pattern is applied and dried by any means such as a die coater printing method between a number of barrier ribs 2 formed on a substrate 1. Next, as shown in FIG. 1B, by exposing with a light 5 having an appropriate wavelength through a photomask 4, the exposed portion is cured, and this is treated with a developing solution to thereby obtain a predetermined portion as shown in FIG. 1C. The phosphor-containing layer can be left only in the cell. It is assumed that the phosphor pattern forming composition of FIG. 1C includes a phosphor that emits green light.

Next, by repeating the operations shown in FIGS. 1A to 1C using the composition for forming a pattern containing a blue light-emitting phosphor, the predetermined composition 6 for forming a phosphor pattern can be filled in a predetermined cell. (FIG. 2A). Further, the same procedure is performed using the composition 7 for forming a pattern containing the red light-emitting phosphor, so that RGB is formed at a predetermined portion of the cell as shown in FIG. 2B.
Of the three colors of the phosphor-containing pattern forming compositions.

By baking the state shown in FIG. 2B at an appropriate temperature, the organic substances in the phosphor-containing pattern forming composition are burned off, and three colors of RGB are deposited on the inner surface of the cell as shown in FIG. 2C. The phosphor layers 3, 6, and 7 are respectively formed. In particular, the filling order of the three color phosphor layers of RGB is not limited. However, after forming the red phosphor layer, the phosphor layers of other colors are formed on the red phosphor layer. It is preferable that the red phosphor layer is formed last because the phosphor of the above color tends to remain.

When the phosphor pattern forming composition used in the present invention is a water-developing type, development after exposure is water,
In the case of a dilute alkali developing type, the development is performed using a dilute aqueous solution of about 1 to 2% by weight of an alkali such as sodium carbonate or potassium carbonate. After the development process, the rib substrate filled with the RGB phosphor is fired at 500 to 550 ° C. to fix the phosphor layer inside the cell. Thus, the phosphor layer can be fixed on the glass substrate serving as the PDP rear substrate. The cross-sectional shape of the phosphor layer thus formed is as shown in FIG. 2C.

In the present invention, as shown schematically in FIG.
When the height of the barrier rib is R, the thickness of the phosphor layer between the ribs is a, and the thickness of the phosphor layer at a height of 4 / 5R from the bottom of the barrier rib is b, b / a = 0.5 to
When it was 1, it was found that the light emission from the phosphor layer was the largest, and the light emission direction and the light emission amount were all directions, so that the best image display was possible.

[0033]

Next, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to these examples. It should be noted that “part” or “%” in the text is based on weight. Example 1, green-emitting phosphor: Zn ₂ S _4: Eu (trade name: P1-G1S, Chemical Oputoniku, Inc., Ltd.) 500 parts of hydroxypropyl cellulose (trade name: Nisso HPC-L, manufactured by Nippon Soda Co.) 70 parts ・ 80 parts of pentaerythritol tetraacrylate ・ 20 parts of 2-hydroxy-3-phenoxypropyl acrylate ・ 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1 (trade name: Irga Cure 907, Ciba Specialty Chemicals Co., Ltd.) 20 parts 2,4-diethylthioxanthone 10 parts Hydroquinone 0.01 part Thickener: fatty acid amide wax (trade name: DISVALON 6900-20X, manufactured by Kusumoto Chemicals) 30 Part ・ Defoamer 5 parts ・ Cyclohexyl alcohol 400 parts The mixture was kneaded with a mill to prepare a phosphor paste composition. The viscosity of this composition was 15,000 mPa · S at 25 ° C. as measured by a B-type rotational viscometer.

Next, this phosphor paste composition is applied on the entire surface of a glass substrate on which an address electrode layer, a dielectric layer and a barrier rib layer have been formed by a die coater, dried at 90 ° C. for 30 minutes and left at room temperature. did. Then, through a mask having a predetermined pattern, using a UV lamp “TL180w / 10R” manufactured by Philips, 200 mJ / c.
m ² ultraviolet rays were selectively irradiated, developed with water at 20 ° C. for 1 minute, and baked at 550 ° C. for 30 minutes. The phosphor layer thus obtained did not float and was in close contact with the substrate. The thickness a between the barrier ribs of the phosphor layer is 2
5 μm, thickness b at a height of 4 / 5R described above is 20 μm
(B / a = 0.8). When the phosphor layer thus obtained was used as a PDP to examine the light emission characteristics, it was possible to obtain good green light emission without discoloration.

Example 2 Blue light-emitting phosphor: BaMgAl ₁₀ O ₁₇ : Mn (trade name: KX-501A, manufactured by Kasei Optonics Co., Ltd.) 500 parts Hydroxypropylcellulose (trade name: Nisso HPC-L, Nippon Soda) 70 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1 (product) Name: Irgacure 907, manufactured by Ciba Specialty Chemicals) 20 parts ・ 2,4-diethylthioxanthone 10 parts ・ Hydroquinone 0.01 part ・ Thickener: fatty acid amide wax (trade name: DISVALON 6900-20X, Kusumoto Chemicals) 30 parts ・ Defoamer 5 parts ・ Cyclohexyl alcohol 40 The parts The above components were kneaded by a three-roll mill to prepare a phosphor paste composition. The viscosity of this composition was 15,000 mPa · S at 25 ° C. as measured by a B-type rotational viscometer. Next, a phosphor layer was formed in the same manner as in Example 1, and the light emission characteristics were examined using this as a PDP. As a result, good blue light was emitted without discoloration.

Example 3 ・ Red emitting phosphor: (Y, Gd) BO ₃ : Eu (trade name: KX-504A, manufactured by Kasei Optonics Co., Ltd.) 500 parts ・ Hydroxypropyl cellulose (trade name: Nisso HPC-L) 70 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone- 1 (trade name: Irgacure 907, manufactured by Ciba Specialty Chemicals) 20 parts 2,10-diethylthioxanthone 10 parts Hydroquinone 0.01 part Thickener: fatty acid amide wax (trade name: DISVALON 6900-20X, 30 parts-Defoamer 5 parts-Cyclohexyl alcohol 400 Parts The above components were kneaded with a three-roll mill to prepare a phosphor paste composition. The viscosity of this composition was 15,000 mPa · S at 25 ° C. as measured by a B-type rotational viscometer. Next, a phosphor layer was formed in the same manner as in Example 1, and the luminescence characteristics were examined using this as a PDP. As a result, good luminescence was obtained without discoloration.

Comparative Example ・ Red emitting phosphor: (Y, Gd) BO ₃ : Eu (trade name: KX-504A, manufactured by Kasei Optonics Co., Ltd.) 500 parts ・ Hydroxypropyl cellulose (trade name: Nisso HPC-L, Nippon Soda Co., Ltd.) 70 parts ・ Pentaerythritol tetraacrylate 80 parts ・ 2-hydroxy-3-phenoxypropyl acrylate 20 parts ・ 2-benzyl-2-dimethylamino-1- (4-motifolinophenyl) -butanone ( Product name: Irgacure 369, manufactured by Ciba Specialty Chemicals) 20 parts ・ Hydroquinone 0.01 part ・ Defoaming agent 5 parts ・ 3-Methyl-3-methoxybutanol 350 parts

The above components are kneaded with a three-roll mill,
A phosphor paste composition was prepared. The viscosity of this composition was 15,000 m at 25 ° C. as measured with a B-type rotational viscometer.
Pa · S. This phosphor composition was applied to the entire surface of a glass substrate having barrier ribs formed thereon using a die coater.
When dried at 0 ° C. for 30 minutes and allowed to stand at room temperature, the phosphor layer had a thick bottom surface and a thin wall surface as shown in FIG. 4B. Exposure and development were carried out and patterning was attempted in the same manner as in Example 1. However, during the development, all of the phosphor layer was eluted in water and no phosphor pattern was obtained.

[0039]

According to the present invention, by using a thickener, the amount of the binder resin can be reduced without lowering the viscosity, so that the paste coating property and firing property are improved and the wall surface of the barrier rib is improved. Also, a phosphor pattern having a phosphor layer with a sufficient thickness can be formed.

[Brief description of the drawings]

FIG. 1 illustrates a method of the present invention.

FIG. 2 illustrates a method of the present invention.

FIG. 3 is an explanatory diagram of a configuration of a PDP.

FIG. 4 is a diagram illustrating a conventional method.

FIG. 5 is a diagram illustrating a relationship between the thicknesses of phosphor layers.

[Explanation of symbols]

 1: substrate 2: barrier rib 3: phosphor-containing layer (green) 4: photomask 5: light 6: phosphor-containing layer (blue) 7: phosphor-containing layer (red) 31: front plate 32: back plate 33: Barrier rib 34: Sustain electrode 35: Bus electrode 36: Dielectric layer 37: Protective layer 38: Address electrode 39: Phosphor layer 40: Dielectric layer of back body

Continued on the front page (72) Inventor Kazunori Nakamura 1-1-1, Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Inside Nippon Printing Co., Ltd. (72) Inventor Hiroshi Funada 1-1-1, Ichigaya-ka-cho, Shinjuku-ku, Tokyo No. Dai Nippon Printing Co., Ltd. (72) Inventor Naoki Goto 1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo Dai-Nippon Printing Co., Ltd. No. 1 Dai Nippon Printing Co., Ltd. F-term (reference) in The Inktech Co., Ltd. CH012 DE148 DE188 DH038 DJ008 DJ019 DJ039 DJ049 EE036 EE056 EH077 EH107 E H157 EN096 EP019 EU236 EV316 EW146 FA089 FD146 FD208 FD332 FD339 GP00 GQ00 HA05 HA08 4J011 SA25 SA26 SA45 SA61 SA63 SA64 5C028 FF16 HH14 5C040 FA01 GA03 GB03 GG09 JA04 JA12 JA15 KB03 MA23 MA24

Claims (8)

[Claims] 1. A phosphor pattern-forming composition comprising a binder resin, a photopolymerizable monomer, a photopolymerizable initiator, a phosphor and an organic solvent, and further comprising a thickener. 2. The composition has a viscosity of from 5,000 to 25 ° C.
The composition for forming a phosphor pattern according to claim 1, wherein the composition has a viscosity of 50,000 mPa · s. 3. The phosphor pattern forming composition according to claim 1, wherein the content of the thickener is 0.5 to 10% by weight based on 100 parts by weight of the composition. 4. The composition according to claim 1, wherein the content of the binder resin is
An amount occupying 2 to 15% by weight in 0 part by weight.
3. The composition for forming a phosphor pattern according to item 1. 5. The phosphor pattern forming composition according to claim 1, wherein the content of the phosphor is 15 to 70% by weight based on 100 parts by weight of the composition. 6. The method according to claim 1, further comprising a phosphor dispersant.
3. The composition for forming a phosphor pattern according to item 1. 7. A step of filling and drying the phosphor pattern forming composition according to claim 1 between a plurality of barrier ribs formed on a substrate, and a photo having a desired pattern. A method for manufacturing a back plate of a plasma display panel, comprising a step of exposing through a mask, a step of developing and removing a non-exposed area, and a step of baking the composition remaining in the exposed area. 8. A back plate of a plasma display panel in which a phosphor layer is formed between a plurality of barrier ribs formed on a substrate, wherein the height of the barrier rib is R, and the thickness of the phosphor layer between the ribs is R. A back panel of a plasma display panel, wherein b / a is 0.5 to 1, where a is the thickness of the phosphor layer at a height of 4 / 5R from the bottom of the barrier rib.