JP2001283724A - Blast mask ink and rib formaton method for plasma display panel therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for making a rib of a desired form when making the rib for a plasma display panel in a sand blast method using a permeation type blast mask. SOLUTION: After patterning on a rib material layer 12 formed on a substratell, a blast mask ink that permeates into the rib material layer 12 and its blast rate of permeated portion 13 is designed to be around 0-0.8 times the rib material layer is applied. By permeating into the lower layer of rib material layer 12, a permeated portion is scraped gradually, but is maintained to have the said blast rate. When making the rib for the plasma display panel through the sand blast process, the permeation type blast mask can be formed. The permeated portion is scraped off to some extent for making a differentiated step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a plasma display panel (hereinafter, referred to as a PDP) as a self-luminous type flat display using gas discharge, and more specifically, a technique for forming ribs constituting a PDP. It is about.

[0002]

2. Description of the Related Art In general, a PDP is provided with a pair of electrodes arranged regularly on two opposing glass substrates, respectively.
In the meantime, a rare gas mainly composed of Ne, Xe, or the like is sealed. Then, a voltage is applied between these electrodes, and a discharge is generated in minute cells around the electrodes to cause each cell to emit light and display is performed. In order to display information, cells arranged regularly are selectively discharged and emitted. 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. 1 shows a configuration example of an AC type PDP. This figure shows the front plate and the back plate separated from each other. As shown in the figure, two glass substrates 1 and 2 are arranged in parallel and opposed to each other, and both become the back plate. The ribs 3 provided on the glass substrate 2 in parallel with each other are held at regular intervals. On the back side of the glass substrate 1 serving as a front plate, composite electrodes composed of a sustain electrode 4 which is a transparent electrode and a bus electrode 5 which is a metal electrode are formed in parallel with each other, and a dielectric layer 6 is covered thereover. The protective layer 7 (MgO layer) is further formed thereon. On the front side of the glass substrate 2 serving as the back plate, address electrodes 8 are formed between the ribs 3 so as to be orthogonal to the composite electrodes and are formed in parallel with each other. Are formed, and a phosphor 10 is provided so as to cover the wall surface of the rib 3 and the cell bottom surface. In order to perform color display, one of the phosphor materials that emits light in each of the RGB colors is filled between the ribs 3, and the back plate has a large number of sets of three striped phosphor screens of each of the RGB colors. Structure.

The AC type PDP is of a surface discharge type, and has a structure in which, after writing is performed by an address electrode 8, an AC voltage is applied to a composite electrode on the front panel to discharge by an electric field generated in a space. In this case, since the alternating current is applied, the direction of the electric field changes according to the frequency. Then, the phosphor 10 emits light by the ultraviolet light generated by the discharge, so that an observer can visually recognize the light transmitted through the front plate.

[0005]

Generally, in PDPs, it is one of the important issues to increase the luminance when the phosphor screen emits light. Various methods have been proposed to increase the brightness, but there is no definitive solution, and the brightness is gradually increased by stacking a plurality of methods. As one of them, increasing the light emitting area of the phosphor screen is effective in that the luminous efficiency is improved due to the efficient operation of ultraviolet light on the phosphor screen and the luminance is increased. However, A of the above structure
In the C-type PDP, the phosphor 10 is provided so as to cover the wall surfaces of the ribs 3 on both sides and the cell bottom surface, and the phosphor surface is formed so as to extend over only three surfaces, so that the light emitting area is restricted. ing.

Therefore, there has been proposed an invention relating to a rib shape of a PDP capable of increasing luminance when a fluorescent screen is made to emit light. For example, in Japanese Patent Application Laid-Open No. Hei 10-32148, a horizontal rib (auxiliary partition) perpendicular to a vertical rib is provided so that four sides of a display cell portion are surrounded, and a light emitting area is increased. Things have been suggested. However, in the above publication, the method of forming the ribs is limited and is not necessarily given a good option.

On the other hand, a penetrating blast mask is used as a method for forming a rib having a complicated shape capable of increasing the luminance when the fluorescent screen is illuminated, including the rib having the shape described in the above-mentioned publication. The sandblasting method has been newly considered.

This new sandblasting method basically uses a coating type blast mask formed of a normal resist such as a dry film resist for forming vertical ribs and an ink composition penetrating a rib material layer. This is a method of using the immersion type blast mask for forming horizontal ribs. When sand blasting is performed on the rib material layer on which such two types of blast masks are formed, a portion where the ink composition has penetrated is cut to some extent, so that a step is formed between the vertical ribs and the horizontal ribs in one blasting process. It is possible. In addition, by combining a penetration type blast mask formed of two or more different ink compositions in addition to a normal coating type resist mask, each of the different heights can be achieved in a smaller number of steps (for example, one blast step). It becomes possible to form patterned ribs. And in such a sandblasting method, the selection of the ink composition which forms the penetration type blast mask determines the quality of the rib formation.

The present invention has been made in view of the above background, and an object of the present invention is to form a rib of a desired shape when forming a rib of a PDP by a sandblast method using a permeation type blast mask. An object of the present invention is to provide a blast mask ink capable of forming a PDP and a method for forming a rib of a PDP using the blast mask ink.

[0010]

In order to achieve the above object, a blast mask ink of the present invention is a blast mask ink used when forming a rib of a PDP by a sand blast method, and is formed on a substrate. After patterning on the formed rib material layer, the rib material layer penetrates the rib material layer, and the blast rate of the permeated portion is in the range of 0 to 0.8 times the rib material layer. In order to control the height of the horizontal rib, the blast rate is preferably in the range of 0 to 0.5 times the rib material layer.

Then, by penetrating into the lower rib material layer, the above-mentioned blast rate can be maintained while the penetrated portion is being scraped little by little.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The blast mask ink of the present invention has permeability to a rib material layer formed on a substrate. Also, after the blast mask ink has penetrated into the rib material layer, the blast mask ink has appropriate grinding resistance to sand blasting and can form low ribs. In addition, it also has a burning property of burning out in the firing step.

[0013] Here, the permeability of the blast mask ink means that it penetrates from the surface of the rib material layer to reach a predetermined depth,
Permeability to form a blast mask. This permeability depends on the fluidity, drying property, affinity with the rib material layer, etc. of the blast mask ink. That is, a desired permeability can be obtained depending on the composition and the adjustment method of the blast mask ink.

[0014] The term "appropriate grindability" as used herein refers to an appropriate grindability of a blast mask formed using the blast mask ink. That is, the moderately difficult grindability refers to the characteristic of the blast mask ink that is ground to a predetermined depth in the sand blasting process, and a blast mask that is hard to grind beyond the depth is obtained.

[0015] Here, the term "burnout property" refers to the burnout property of a blast mask formed using the blast mask ink. That is, the burning property means that the residual amount in the ribs and the substrate in the firing step is reduced to an amount that does not cause a problem, and the physical property such as bubbles in the ribs in the firing step is reduced.
A property of blast mask ink that does not cause chemical problems.

The blast mask ink of the present invention preferably comprises an ink composition containing 5 to 60 parts by weight of an inorganic component with respect to 100 parts by weight of an organic component. Because, when the inorganic component exceeds 60 parts by weight, the blast resistance deteriorates,
Also, a large amount of the inorganic component remains at the intersection with the vertical rib and the shape is deformed. Conversely, if the amount of the inorganic component is less than 5 parts by weight, the printability deteriorates.

It is preferable that the inorganic component constituting the ink composition comprises a glass frit. That is,
When the inorganic component remaining at the intersection with the vertical rib is a glass frit, it is integrated with the rib when fired, so that pseudo defects are reduced. Further, strength and adhesion are improved. In the case of a filler such as alumina alone, the rib remains in a powder form and the shape of the rib becomes uneven. For example, when alumina remains, many false defects are detected in the defect inspection of the rib.

It is preferable that the inorganic component constituting the ink composition comprises a glass frit, an inorganic filler, and a coloring pigment. As described above, when the inorganic component is a component similar to the rib, pseudo defects are further reduced.

The softening point of the inorganic component constituting the ink composition is preferably within a range of ± 20 ° C. of the softening point of the lower rib. That is, when the temperature exceeds + 20 ° C., the sintering becomes sweet and the strength is reduced, and when the temperature is lower than −20 ° C., the shape is deteriorated due to sagging.

The average particle size of the inorganic component constituting the ink composition is preferably from 0.01 to 5 μm. If the average particle size exceeds 5 μm, after penetrating the rib material layer,
Since a large filler remains on it, it hinders dry film lamination or blast mask printing for vertical ribs.

Further, the solvent of the ink composition contains 5% of the organic component.
It is preferably 0% or less. That is, it is preferable that the solvent is not introduced because the penetration of the solvent is prioritized and the penetration is likely to be uneven.

The viscosity of the ink composition used for the blast mask ink is determined by a rotational viscometer with a shear rate of 0.1 S ^-1.
Is preferably 10,000 to 200,000 cps. If the viscosity of the ink composition is too high above this range,
Poor printability. Conversely, if the viscosity of the ink composition is too low, the printability will be poor, and uneven penetration will tend to occur.

The ink composition used for the blast mask ink may be of an ionizing radiation curable type.

The organic component constituting the blast mask ink comprises at least one of a resin, a plasticizer, a monomer and an oligomer.

As the resin of the organic component constituting the blast mask ink, polybutene, ester resin, (meth)
Acrylic resin, (anhydrous) maleic acid resin, alkyd resin, (allyl) ether resin, urethane resin, silicone resin, silicone oil, polypropylene glycol, polyethylene glycol, polybutylene glycol, polybutadiene, and the like, but are not limited thereto. Instead, these oligomers may be used. As a form, a liquid or viscous liquid resin is preferable, and a resin that is burned off in the firing step is used.

The ink composition used for the blast mask ink includes, in addition to the organic and inorganic components described above, a dispersant,
Thickeners, thixotropic agents, defoamers, adhesives, dyes, polymerization initiators, sensitizers, ultraviolet absorbers, and the like may be added.

As a method of patterning the blast mask ink on the rib material layer, screen printing is preferable, but any method such as offset printing, dispensing method, gravure printing, and dispensing method using an electric field may be adopted. . Also, the blast mask ink patterned on the rib material layer may penetrate if left untreated, but if it does not penetrate into the rib material layer or if it penetrates slowly, heat it to promote penetration. Is also good.

A method for forming a rib using the above blast mask ink will be described with reference to FIG. This figure 2
In the figure, the drawing on the left is a sectional view in a direction parallel to the address electrodes, and the drawing on the right is a sectional view in a direction perpendicular to the address electrodes.

First, as shown in FIG.
To form a rib material layer 12 which is entirely solid. Next, as shown in FIG. 2B, a blast mask ink having permeability to the rib material layer 12 is pattern-printed, and the blast mask ink is permeated from the surface of the rib material layer 12 to form a permeation type blast mask 13. FIG. 2 (b)
Discloses a screen printing method using a screen printing plate M and a squeegee S as a printing method of blast mask ink.

Next, as shown in FIG. 2C, a coating type blast mask 14 is formed on the surface of the rib material layer 12 on which the permeation type blast mask 13 has been formed. Subsequently, FIG.
As shown in (d), a sand blasting process is performed on the rib material layer 12 through the penetration type blast mask 13 and the covering type blast mask 14. By this sand blasting, the portion of the penetration type blast mask 13 is ground to a predetermined depth, and the portion of the coating type blast mask 14 is hardly ground. That is, the permeation type blast mask 13 is a resist that permeates from the surface and performs a substantial function at a deep position. On the other hand, the coating type blast mask 14 is a normal resist that functions on the surface. Next, as shown in FIG. 2E, the coating type blast mask 14 is peeled off, and the rib material layer is fired. Thereby, the horizontal ribs 16 as auxiliary ribs are provided between the vertical ribs 15.
Is obtained.

In the above-described rib forming method, if a plurality of different types of blast mask inks are respectively printed on the surface of the rib material layer by pattern printing and penetrated to form a plurality of blast masks having different blast rates,
By one sandblasting process, two or more types of patterned ribs can be formed.

The blast mask 14 can be formed by a known method. For example, a permeation type resist mask can be formed on the surface of the formed rib material layer 12 by printing using a printing paste having a film forming property with respect to the rib material layer 12. Alternatively, it can be formed by sticking a dry film resist on the surface of the rib material layer 12, exposing the dry film through a photomask, and performing subsequent development to leave a portion of the dry film resist to be a rib.

FIG. 3 is a perspective view showing a part of a back plate having ribs obtained by the above-described rib forming method. The ribs on the back plate shown in FIG. 3 are provided with horizontal ribs 16 as auxiliary ribs at right angles between the vertical ribs 15 and the horizontal ribs 1.
Reference numeral 6 denotes a step matrix structure lower than the vertical ribs 15. In FIG. 1, the address electrodes and the dielectric layers provided on the substrate 11 are omitted. The vertical ribs 15 are formed between the address electrodes and in parallel with the address electrodes. Side rib 1
Numeral 6 is formed so as to define a cell space 17 as a discharge space specified by the bus electrodes on the front panel and the address electrodes on the rear panel. After the vertical ribs 15 and the horizontal ribs 16 are formed in such a shape, the phosphor is provided so as to cover the wall surfaces of the vertical ribs 15 and the horizontal ribs 16 and the cell bottom surface, thereby completing the rear plate. This type of back plate has a cell space 1
7 is surrounded on all sides by the vertical ribs 15 and the horizontal ribs 16, and the light emitting area of the phosphor screen is larger than that in the case of a stripe structure having no horizontal ribs. Accordingly, since the ultraviolet rays generated in the cell space 17 due to the discharge act on the phosphors on all sides, high luminance can be obtained. Also, the horizontal rib 16
Accordingly, it is possible to prevent discharge or ultraviolet rays generated by the discharge from leaking to the cell space 17 adjacent in the address electrode direction. That is, the vertical ribs 15 and the horizontal ribs 16 separate the discharge space specified by the address electrode and the bus electrode from other spaces. Therefore, the image quality of the PDP is improved. Note that the space above the horizontal ribs 16 serves to pass exhaust gas when the panel is formed.

The ribs having the shape shown in FIG. 3 are formed by forming the permeation type blast mask 13 into a pattern of only horizontal ribs and the covering type blast mask 14 into a pattern of vertical ribs in the rib forming method of FIG. Can be. In that case, the pattern of the penetration type blast mask 13 corresponding to the horizontal rib is a continuous stripe pattern penetrating the vertical rib. This makes it possible to form a rib having no or little shape distortion.

FIG. 4 is a perspective view showing a part of a back plate having ribs of another shape obtained by the above-described rib forming method. The ribs on the back plate shown in FIG. 4 are provided with horizontal ribs 16 as auxiliary ribs at right angles between the vertical ribs 15, and the horizontal ribs 16 are intermediate and lower than the vertical ribs 15. It is. That is, the lateral rib 16 has a concave side shape when viewed from the longitudinal direction of the vertical rib 15.
With this concave shape, the same operation as described above can be obtained. That is, the light emitting area of the phosphor screen increases, and the ultraviolet light efficiently acts on the phosphor screen, so that the luminance increases. Further, the cell spaces 1 adjacent in the address electrode direction by the horizontal ribs 16 are formed.
7 can be prevented from leaking and ultraviolet rays generated by the discharge. That is, the vertical rib 15 and the horizontal rib 1
No. 6 separates the discharge space specified by the address electrode and the bus electrode from other spaces, so that the image quality of the PDP is improved. Further, the space above the horizontal ribs 16 serves to pass exhaust air when the panel is formed.

In the rib forming method shown in FIG. 4, in the rib forming method shown in FIG. 2, the penetration type blast mask 13 has a pattern of only horizontal ribs, and the coating type blast mask 14 has all the vertical ribs and a part of the horizontal ribs. It can be formed by forming a pattern. In that case, the pattern of the penetration type blast mask 13 corresponding to the horizontal rib is a continuous stripe pattern penetrating the vertical rib. This allows
It is possible to form a rib having no or little shape distortion.

FIG. 5 is a perspective view showing a part of a back plate having ribs of still another shape obtained by the above-described rib forming method. The ribs on the back plate shown in FIG. 5 are provided with horizontal ribs 16 as auxiliary ribs intersecting at right angles between the vertical ribs 15, and the horizontal ribs 16 are lower than the vertical ribs 15 and the volume is reduced. This is a step matrix structure in which a concave portion 16a is provided on the upper surface. That is, the lateral rib 16 has a concave side shape when viewed from a direction orthogonal to the vertical rib 15. This type of back plate is similar to that shown in FIG.
The light emission area of the phosphor screen is increased, and ultraviolet light efficiently acts on the phosphor screen, so that the luminance is increased. In addition, the lateral ribs 16 can prevent discharge and ultraviolet rays generated by the discharge from leaking to the cell space 17 adjacent in the address electrode direction. In other words, the vertical ribs 15 and the horizontal ribs 16 separate the discharge space specified by the address electrode and the bus electrode from other spaces, so that the image quality of the PDP is improved. Further, the space above the horizontal ribs 16 serves to pass exhaust air when the panel is formed. Since the concave portion 16a is provided on the surface of the lateral rib 16, the capacitance of the entire rib is reduced and the reactive current is reduced as compared with the case where the concave portion 16a is not provided. . Therefore, it is desirable to make the concave portion 16a of the lateral rib 16 as low as possible and to reduce the volume of the entire rib.

The ribs having the shape shown in FIG. 5 are formed by forming the permeation type blast mask 13 only on both sides of the rib forming method shown in FIG. 14 can be formed by forming a vertical rib pattern. In that case, the pattern of the penetration type blast mask 13 corresponding to both sides of the horizontal rib is a continuous stripe pattern penetrating the vertical rib. When the sand blasting is performed, a cell space is formed, a step is formed between the vertical ribs 15 and the horizontal ribs 16, and a concave portion 16a is formed in the middle of the horizontal ribs 16. In this case, since the cell space 17 is wide, it is deeply ground.
Since the recess 16a of No. 6 is narrow, the grinding is not so deep in the grinding time of the cell space 17.

According to the rib forming method of the present invention, a rib having a structure other than those shown in FIGS. 3 and 4 can be formed.

The rib paste forming the rib material layer comprises at least an inorganic component having a glass frit and a resin component removed by firing.

As the glass frit constituting the rib paste, one having a softening point of 400 to 600 ° C. and a thermal expansion coefficient (α ₃₀₀ ) of 60 to 95 × 10 ⁻⁷ / ° C. is used. If a glass frit having a softening point exceeding 600 ° C. is used, it is necessary to raise the sintering temperature, and it is not preferable because a glass frit having a softening point lower than 400 ° C. Glass frit is fused before it is decomposed and volatilized, and voids and the like are generated in the layer, which is not preferable. On the other hand, if the coefficient of thermal expansion is out of the above range, the difference from the coefficient of thermal expansion of the glass substrate is large, and distortion or the like occurs, which is not preferable. A glass transition temperature of 350 to 500 ° C is used.

Specific examples of the glass frit constituting the rib paste include PbO—SiO ₂ —B ₂ O
_{3 system, Bi 2 O 3 -SiO 2 -B} 2 O 3 system, ZnO-B
₂ O ₃ —SiO ₂ —Alkaline (earth) metal oxide, B
_{i 2 O 3 -ZnO-B 2} O 3 systems. Among these glass frit, those having an average particle size of 0.1 to 10 μm, preferably 0.5 to 5 μm are used.

In addition, an inorganic filler is added to the rib paste as an inorganic component in addition to the above-mentioned glass frit. Further, an inorganic pigment may be added.

The inorganic filler as an inorganic component of the rib paste is intended to prevent casting at the time of firing and to improve compactness, and has a softening point higher than that of glass frit. In the present invention, for example, titania, Alumina, zirconia, silica, silicate, steatite, zircon,
Forsterite, beryllia, tin oxide, ITO, Zn
O, RuO and the like are mentioned, and the above oxide doped with impurities such as antimony-doped tin oxide is used.
Among them, those having an average particle diameter of 0.01 to 5 μm and a shape of a sphere, an irregular shape, a block, a needle, or a bar are used. The proportion of the inorganic filler used is 100 glass frit.
The amount of the inorganic filler is preferably 5 to 50 parts by weight with respect to parts by weight.

An inorganic pigment as an inorganic component of the rib paste is added as necessary to reduce external light reflection and improve practical contrast. Co-Cr-
Fe, Co-Mn-Fe, Co-Fe-Mn-Al, C
o-Ni-Cr-Fe, Co-Ni-Mn-Cr-F
e, Co-Ni-Al-Cr-Fe, Co-Mn-Al
And complex oxides such as -Cr-Fe-Si. Examples of the fire-resistant white pigment include titanium oxide, aluminum oxide, silica, and calcium carbonate. The average particle size of the inorganic pigment used is preferably 0.01 to 5 μm.

The resin components constituting the rib paste include cellulose derivatives such as ethylcellulose, hydroxypropylcellulose, methylcellulose and nitrocellulose, polyester resins such as polyacrylester and alkyd resin, acrylic acid, methacrylic acid, itaconic acid and maleic acid. Acid, fumaric acid, crotonic acid, vinyl acetic acid, methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl methacrylate, propyl acrylate, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, 2-hexyl acrylate, lauryl methacrylate, Lauryl acrylate, stearyl methacrylate, stearyl acrylate, dodecyl methacrylate, dode Acrylate, hexyl methacrylate, hexyl acrylate, octyl methacrylate, octyl acrylate, cetyl methacrylate, cetyl acrylate, nonyl methacrylate, nonyl acrylate, decyl methacrylate, decyl acrylate, cyclohexyl methacrylate, cyclohexyl acrylate, glycidyl methacrylate, dimethylaminoethyl methacrylate, 2 -Methoxy acrylate, 2 (2-ethoxyethoxy) ethyl acrylate,
2-hydroxyethyl methacrylate, diacetone acrylamide, N, N-dimethylaminopropylacrylamide, N, N-diethylacrylamide, isopropylacrylamide, diethylaminoethyl methacrylate, t-butyl methacrylate, N, N-dimethylacrylamide, α-methylstyrene, Homopolymers composed of monomers such as styrene, vinyltoluene and N-vinyl-2-pyrrolidone, and copolymers composed of two or more monomers selected from the above monomers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers Examples thereof include polymers, polyolefin-based resins such as ethylene-vinyl acetate copolymer, polyvinyl formal, polyvinyl butyral, and the like.

As the solvent for the rib paste, α-, β
-, Terpenes such as γ-terpineol, ethylene glycol monoalkyl ethers, ethylene glycol dialkyl ethers, diethylene glycol monoalkyl ethers, diethylene glycol dialkyl ethers, ethylene glycol monoalkyl ether acetates, ethylene glycol dialkyl ether acetates, Diethylene glycol monoalkyl ether acetates, diethylene glycol dialkyl ether acetates, propylene glycol monoalkyl ethers, propylene glycol dialkyl ethers, propylene glycol monoalkyl ether acetates, propylene glycol dialkyl ether acetates, methanol, ethanol, isopropanol, 2-ethylhexyl Nord, 1-butoxy-2-propanol alcohols such like are exemplary, and may be mixed and used singly or two or more kinds.

Further, a plasticizer, an anti-settling agent, a dispersant, an antifoaming agent, a dye, a silane coupling agent, a monomer initiator, a sensitizer, an ultraviolet absorber and the like are appropriately used in the rib paste as required. can do.

[0049]

Next, the present invention will be described in detail with reference to examples. Here, a back plate having ribs having a step matrix structure shown in FIG. 2 was prepared, and a panel was formed using the back plate.

Example 1 First, an address electrode and a dielectric layer were formed on the address electrode on a glass substrate, and a rib paste having the following composition was coated on the address electrode by a die coater. Dried for 170 minutes
A μm rib material layer was formed. The glass frit having the following composition contains ZnO, B ₂ O ₃ , SiO ₂ , an alkaline earth metal oxide and an alkali metal oxide, and has a glass transition point of 460 ° C., a softening point of 556 ° C., and a thermal expansion. The coefficient was 80 × 10 ⁻⁷ / ° C., and the rib paste was prepared by kneading the following components with three rolls.

<Rib paste composition> 100 parts by weight of glass frit 15 parts by weight of alumina ("Taimicron TM-DAR" manufactured by Daimei Chemical Co., Ltd.) 3 parts by weight of ethyl cellulose 15 parts by weight of terpineol 15 parts by weight of butyl carbitol acetate Department

Next, patterning was performed on the rib forming material layer by screen printing using blast mask ink A having the following composition. Here, width: 470 μm, pitch:
Using a screen plate with a horizontal line pattern of 1.08 mm, the gap between the substrate and the screen plate:
Printing was performed under the conditions of 2.5 mm, a scraper speed of 40 mm / sec, and a squeegee speed of 50 mm / sec. Then, after printing, the blast mask ink was allowed to permeate the rib material layer by being left for one day. The rib frit having the following composition is a glass frit composed of 70 parts of a mixture of Pb-based glass and Bi-based glass and 30 parts of alumina, and has a softening point of 5:
70 ° C., glass transition point: 485 ° C., coefficient of thermal expansion (α ₃₀₀ ): 80 × 10 ⁻⁷ / ° C. A blast mask ink was prepared by mixing, stirring, and dispersing the following components. The viscosity of the obtained ink composition was 70,000 cps at a shear rate of 0.1 S ⁻¹ by a rotational viscometer.

<Composition of Blast Mask Ink A> 73.5 parts by weight of polybutene ("30N" manufactured by NOF Corporation) 20 parts by weight of rib frit 0.5 part by weight of defoamer (dimethylpolysiloxane) 0.5 parts by weight of silica (central particles) Diameter: 0.05 μm) 2 parts by weight ・ Plasticizer (dioctyl phthalate, dioctyl adipate) 5 parts by weight ・ Polypropylene glycol 3 parts by weight

Next, the substrate was heated to 80 ° C., and a dry film resist (“O” manufactured by Tokyo Ohka Kogyo Co., Ltd.) was formed on the rib material layer.
SBR film BF703 ") was laminated. Exposure and subsequent development were performed to form a patterned resist layer as a blast mask on the rib material layer. A parallel light printer using a high-pressure mercury lamp as a light source was used for exposure, and exposure was performed through a vertical stripe pattern mask having a line width of 100 μm and a pitch of 0.36 mm.
Exposure conditions are 200 μW intensity when measured at 365 μm.
/ Cm ² and the irradiation amount was 80 mJ / cm ² . For development, a 0.2% aqueous solution of sodium carbonate was used, and spray development was performed at a liquid temperature of 35 ° C.

Subsequently, in order to perform sandblasting,
The substrate was moved over a number of rollers and carried into the blasting chamber. Then, the abrasive was sprayed from the spray nozzle toward the sandblast mask side of the substrate. In this example, sandblasting was performed at an injection pressure of 1 kg / cm ² using fused alumina (“Fused Alumina A- # 800” manufactured by Fujimi Incorporated) as an abrasive.

After sandblasting, the dry film resist was peeled off at a liquid temperature of 30 ° C. using a 0.7% aqueous solution of sodium hydroxide, and dried. At this point, a step of 30 μm was formed between the vertical ribs and the horizontal ribs.

Then, a peak temperature of 575 ° C. and a holding time of 2
When firing was performed for 0 minutes for a total firing time of 3 hours, ribs having a step matrix structure were formed. The rib has a vertical rib having a top width of 60 μm, a bottom width of 105 μm, and a height of 1 μm.
The horizontal rib had a top width of 400 μm, a bottom width of 500 μm, and a height of 95 μm.

After the ribs were formed, the cell space was filled with the phosphor paste using a screen printer. Specifically, a paste containing a phosphor of green emission color (phosphor: “P1-G1S” 35 manufactured by Kasei Optonics, Inc.)
wt%, resin solid content 6.8wt%, solvent 58.2wt
%) Into a predetermined cell space and dried at 120 ° C. for 30 minutes. Similarly, a paste containing a phosphor of blue emission color (phosphor: “KX-501A” 2 manufactured by Kasei Optonics, Inc.)
7wt%, resin solid content 7.8wt%, solvent 65.2wt
%), A paste containing a phosphor of red emission color (phosphor:
35% by weight of “KX-504A” manufactured by Kasei Optonics,
Resin solids content 4.1 wt%, solvent 57.9 wt%) were each filled in predetermined rib spaces and dried similarly. After the phosphor paste filling step was performed in this manner, a firing step was finally performed to form a phosphor screen in the cell space.

By attaching a separately prepared front plate to the rear plate having the fluorescent screen formed in the cell space as described above, a surface discharge type AC color PDP in which three primary colors of RGB were visually recognized was prepared.

Example 2 A back plate was prepared in the same manner as in Example 1 except that a blast mask ink B having the following composition was used, and a separately prepared front plate was attached to the back plate to form a panel. Was done. The rib frit used in the following composition is the same as that of the blast mask ink A. The viscosity of the ink composition prepared by mixing, stirring, and dispersing the following components was 65,000 cps at a shear rate of 0.1 S ⁻¹ measured by a rotational viscometer.

<Composition of Blast Mask Ink B> ・ Mariarim (“AKM-0531” manufactured by NOF Corporation) 73.5 parts by weight ・ Rib frit 20 parts by weight ・ Defoaming agent (dimethylpolysiloxane) 0.5 part by weight ・ Silica ( (Central particle size: 0.05 μm) 10 parts by weight Plasticizer (dioctyl phthalate, dioctyl adipate) 5 parts by weight

In Example 2, a step of 15 μm was formed between the vertical ribs and the horizontal ribs after the sandblasting. The ribs of the step matrix structure formed after firing have a vertical rib having a top width of 60 μm, a bottom width of 105 μm, and a height of 120 μm, and a horizontal rib having a top width of 450 μm, a bottom width of 550 μm, and a height of 550 μm. 105μ
m.

As described above, when two PDPs each made into a panel were turned on by using two types of back plates prepared using two types of blast mask inks A and B, the quality was particularly good without abnormal discharge. Met.

[0064]

The blast mask ink of the present invention can form a permeation type blast mask when forming a rib of a PDP by a sand blast method. Then, since the permeated portion is cut to some extent by blasting, a step can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a plasma display panel in which a front plate and a back plate are separated from each other.

FIG. 2 is a process chart of a rib forming method using blast mask ink of the present invention.

FIG. 3 is a perspective view showing a part of a back plate having ribs obtained by the rib forming method of the present invention.

FIG. 4 is a perspective view showing a part of a back plate having ribs of another shape obtained by the rib forming method of the present invention.

FIG. 5 is a perspective view showing a part of a back plate having ribs of still another shape obtained by the rib forming method of the present invention.

[Explanation of symbols]

 1, glass substrate 3 barrier 4 sustaining electrode 5 bus electrode 6 dielectric tank 7 protective tank 8 address electrode 9 dielectric tank 10 phosphor 11 substrate 12 rib material layer 13 penetration blast mask 14 covering blast mask 15 vertical rib 16 Horizontal rib 16a Recess 17 Cell space

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B24C 11/00 B24C 11/00 B Z H01J 11/02 H01J 11/02 B (72) Inventor Yozo Kosaka Tokyo 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo F-term (reference) in Dai Nippon Printing Co., Ltd. 5C027 AA09 5C040 FA01 FA04 GA03 GF02 GF03 GF12 GF19 GG05 JA17 KA09 MA03 MA26

Claims (12)

[Claims] 1. A blast mask ink used for forming a rib of a plasma display panel by a sand blast method, wherein the blast mask ink is patterned on a rib material layer formed on a substrate, and then permeates the rib material layer. A blast mask ink characterized in that the blast rate of the penetrated portion is in the range of 0 to 0.8 times the rib material layer. 2. The blast mask ink according to claim 1, wherein the blast mask ink penetrates into a lower rib material layer. 3. The blast mask ink according to claim 1, comprising an ink composition comprising 5 to 60 parts by weight of an inorganic component per 100 parts by weight of an organic component. 4. The blast mask ink according to claim 3, wherein the inorganic component comprises a glass frit. 5. The blast mask ink according to claim 3, wherein the inorganic component comprises a glass frit, an inorganic filler, and a coloring pigment. 6. The blast mask ink according to claim 3, wherein the softening point of the inorganic component is within ± 20 ° C. of the softening point of the lower rib. 7. The inorganic component has an average particle size of 0.01 to 5 μm.
The blast mask ink according to any one of claims 3 to 6, wherein 8. The ink composition according to claim 1, wherein the solvent is 50% of the organic component.
The blast mask ink according to any one of claims 3 to 7, which is as follows. 9. The viscosity of the ink composition is from 10,000 to 200,000 at a shear rate of 0.1 S ⁻¹ measured by a rotational viscometer.
The blast mask ink according to any one of claims 3 to 8, which is cps. 10. The blast mask ink according to claim 3, wherein the ink composition is of an ionizing radiation-curable type. 11. A method for forming a rib of a plasma display panel using the blast mask ink according to claim 1, wherein a rib paste is applied to a substrate to form a solid rib material layer over the entire surface. After that, the blast mask ink is patterned and printed on the rib material layer to form a permeation type blast mask by infiltration, and then, after forming a coating type blast mask by a printing method or a photolithography method, both are formed. A sand blasting process on the rib material layer through the blast mask, and forming the ribs through a firing step. 12. A method of forming a rib of a plasma display panel using the blast mask ink according to claim 1, wherein a rib paste is applied to a substrate to form a solid rib material layer on the entire surface. After that, a plurality of different types of the blast mask inks are respectively printed and permeated to form a plurality of permeation type blast masks having different blast rates, and then a coating type blast mask is formed by a printing method or a photolithography method. After that, a sand blasting process is performed on the rib material layer through all blast masks, and a rib is formed through a firing process.