JP2000348622A - Manufacture for discharge-type display member and manufacture for discharge-type display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent display defect and improve yield of a display by applying barrier-rib correction paste to a defective part of a barrier rib before a baking process of the barrier rib of a discharge-type display member, and baking it to correct the defective part. SOLUTION: For correcting a defective part before a baking process of a barrier rib, correction paste is applied to the defective part in the barrier rib, they are molded and baked simultaneously together with the barrier rib. Baking after the correction of the defective part prevents the defective part from rising during the baking and height of the defective part is equalized after the correction. This prevents defective display during lighting of a display unit. A paste applying method to the defective part is not especially limited. A method of using an application needle is adequate for applying paste with high viscosity, and a method of using a dispenser has high application speed and is adequate for correcting a large defective part. In either case of the application needle or the dispenser, normally, are having width of an application pattern of 10-50 μm is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a substrate for a discharge type display using a plasma discharge such as a plasma display or a plasma addressed liquid crystal display, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A discharge type display such as a plasma display (PDP) or a plasma addressed liquid crystal display (PALC) is expected to be a large flat display. In particular, PDPs can permeate at higher speeds than liquid crystal panels, and thus have permeated OA equipment and publication display devices. Further, progress in the field of high-definition television is highly expected.

A PDP generates a plasma discharge between electrodes facing each other in a discharge space provided between a front glass substrate and a rear glass substrate as shown in FIG. 5, and generates a plasma discharge from an inert gas in the discharge space. The display is performed by applying the generated ultraviolet rays to the phosphor layer formed in the discharge space. PALC uses a charge generated by a discharge instead of a TFT in a TFT-LCD (thin film transistor type liquid crystal display) to drive a liquid crystal. In each case, a partition (barrier) is used to define a discharge space (cell). , Ribs) must be provided in the panel. The partition in the discharge type display has a role of preventing erroneous discharge between adjacent cells, a spacer defining a distance between discharge electrodes, and the like.

[0004] The shape of the partition wall is approximately 30 to 80 µm in width,
The height is 100 to 200 μm. Usually, the partition walls are formed by a method such as a screen printing method, a sand blast method, a photolithography method, and a mold transfer method.

When a partition is formed on a substrate, a chipped portion such as a chip or a crack as shown in FIG. 1 is generated, which causes display defects such as crosstalk and linear display defects when the display is turned on. Become.

In PDP, it is necessary to form a phosphor layer. However, when the phosphor is applied directly into the partition using a nozzle at the time of applying the phosphor, the phosphor is adjacent to the partition due to cracks. The phosphor leaks into the pixel, causing color mixing.

As a method of improving these problems, there is a method of applying a paste to a defective portion of the partition wall to correct the problem. Monthly LCD Intelligence 1998.2
Describes a technique for correcting a defect using a needle. However, according to this method, it is not possible to prevent the defective portion from jumping up as shown in FIG. 4 at the time of firing, so that the height of the partition walls remains non-uniform even after the correction, causing crosstalk. .

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to improve the yield of a discharge type display by correcting a defective portion generated in a partition wall in a process of manufacturing the discharge type display and preventing a display defect. .

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a discharge type display substrate having a partition on a substrate, wherein a partition-correcting paste is applied to a defective portion of the partition before a baking process of the partition pattern. This is achieved by a method for manufacturing a substrate for a discharge type display, wherein a defective portion is corrected by firing after coating.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The discharge type display according to the present invention has a partition for dividing a discharge space on both or any of the opposing substrates, and an electrode for applying a voltage to the discharge space to generate a plasma discharge. . The discharge-type display member in the present invention refers to all members used for a discharge-type display represented by PDP and PALC.

The partition walls in the present invention are formed by applying a paste containing an inorganic powder on a substrate, patterning the paste into a stripe or grid, and then firing.
Another layer such as a dielectric layer may be interposed between the substrate and the partition.
Examples of the pattern processing method include a screen printing method, a photolithography method, a sand blast method, and a method such as a mold transfer method. However, the production method of the present invention does not limit these production methods, and the partition pattern produced by any production method Can be applied in the same way.

As the inorganic powder used for the paste for forming the partition walls, a glass material containing silicon oxide and / or boron oxide as an essential component is preferably used because of its excellent transparency. In addition to these oxides, oxides such as lithium oxide, sodium oxide, potassium oxide, barium oxide, aluminum oxide, lead oxide, bismuth oxide, and zinc oxide are contained, and have properties such as softening point, thermal expansion coefficient, and refractive index. In order to adjust to a value according to the manufacturing method of the partition and the panel characteristics, an inorganic powder in which the contained components and the weight ratio thereof are adjusted is used. Usually, it is preferable to contain 50% by weight or more of a glass material having a glass transition point of 350 to 500 ° C and a softening point of 400 to 620 ° C. If the glass transition point and the softening point are too high, the firing temperature will be high and the substrate will be easily distorted. Further, a glass material having a glass transition point and a softening point which are too low tends to be devitrified, and the debinding property of the organic component contained in the paste tends to decrease.

Hereinafter, a method of repairing a defective portion of a partition will be specifically described.

As shown in FIG. 1, the defective part of the partition wall in the present invention means a part where the partition wall is chipped and cracked as compared with a normal partition wall pattern. As shown in FIGS. 1 to 3, the correction of the defective portion is performed by applying a paste for correction to the defective portion of the partition wall before the baking process of the partition wall, forming (FIG. 2), and firing simultaneously with the partition wall (FIG. 3). Performed by By firing after correcting the defective portion, it is possible to prevent the defective portion from jumping up during firing, and to make the height of the partition wall after the correction uniform. Thereby, display defects at the time of turning on the display can be prevented.

As a method of applying the paste to the defective portion, there are a method using an application needle, a method using a dispenser, and the like, but the application method is not particularly limited in the present invention. The method using an application needle is suitable for applying a high-viscosity paste. The method using a dispenser has a high coating speed and is suitable for correcting a large defect. In both cases of the application needle and the dispenser, those having a coating pattern width of 10 to 50 μm are used. When the thickness is 50 μm or less, the protrusion from the partition wall width can be suppressed. In addition, when the thickness is 10 μm or more, in the case of a needle, the paste easily adheres to the needle,
In the case of a dispenser, application is facilitated in terms of difficulty in clogging and the like, and the apparatus is easily manufactured in terms of processing accuracy.

It is preferable that the difference between the application height at the correction portion and the height of the surrounding partition walls is within ± 5 μm. If the coating height at the correction portion is higher than the height of the surrounding partition walls, display defects due to discharge gap unevenness are likely to occur. Also,
If the application height at the correction portion is lower than the height of the surrounding partition walls, display failure may occur due to leakage of discharge to adjacent cells or leakage of the phosphor paste. Since the display failure due to the discharge gap unevenness is observed as a particularly remarkable display failure, the coating height at the repaired portion is the same as or lower than the height of the surrounding partition, and the height of the surrounding partition is −5 μm to 0 μm.
More preferably, it is within the range of μm.

The partition wall correction paste mainly comprises an inorganic powder component, an organic binder component, and a solvent component.

As the inorganic powder component, similarly to the partition wall pattern material, a glass material containing silicon oxide and / or boron oxide is preferably used because of its excellent transparency. Further, lead oxide and bismuth oxide may be contained to lower the softening point.

It is preferable that the softening point of the glass powder contained in the paste for correcting partition walls is equal to or lower than the softening point of the glass powder constituting the surrounding partition walls. The same softening point,
Alternatively, by using a paste containing a low glass powder, the glass powder of the correction portion can be sintered at a normal firing temperature in the firing step. Further, the difference between the softening point of the glass powder contained in the correction paste and the softening point of the glass powder constituting the surrounding partition walls is preferably within 5 ° C. By setting the difference in the softening point within 5 ° C., sintering can be performed without impairing the shape of the partition wall at the corrected portion.

Specific examples of the organic binder component include (poly) vinyl butyral, (poly) vinyl acetate, (poly) vinyl alcohol, cellulosic polymers (eg, methyl cellulose, ethyl cellulose, hydroxyl cellulose, methyl hydroxyl cellulose), Polyethylene, silicone polymer (eg, (poly) methylsiloxane, (poly) methylphenylsiloxane), polystyrene, butadiene / styrene copolymer, (poly) vinylpyrrolidone, polyamide, high molecular weight polyether, copolymer of ethylene oxide and polypropylene oxide, polyacrylamide And various acrylic polymers (eg, sodium polyacrylate,
Various copolymers and multipolymers of (poly) lower alkyl acrylates, (poly) lower alkyl methacrylates and lower alkyl acrylates and methacrylates are mentioned.

Specific examples of the solvent component include methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl ethyl ketone, dioxane, acetone, cyclohexanone, cyclopentanone, isobutyl alcohol, isopropyl alcohol, tetrahydrofuran, butyl carbitol acetate, dimethyl sulfoxide. , Γ-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.

The difference between the weight content of the glass powder contained in the paste for modifying the partition wall used in the present invention and the weight content of the glass powder contained in the paste for forming the partition wall is 5%.
%, More preferably within 2%. By reducing the difference in the weight content of the glass powder contained in the correction paste and the partition wall paste, the difference in the amount of shrinkage between the correction portion and the surrounding partition walls during firing can be reduced, and the partition height in the correction portion can be reduced. This is because the variation can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to an AC (alternating current) type plasma display. However, the present invention is not limited to this.

Example 1 First, a back plate of an AC (AC) type plasma display panel was formed using a glass substrate (PD-200; manufactured by Asahi Glass Co., Ltd.) having a size of 340 × 260 × 2.8 mm.

A stripe-shaped electrode having a pitch of 140 μm, a line width of 60 μm, and a thickness of 4 μm after firing was formed on a substrate by a photolithography method using a photosensitive silver paste as a writing electrode. The substrate was coated with a dielectric paste by screen printing, and then baked at 550 ° C. to form a 10 μm thick dielectric layer.

Further, a pattern having a pitch of 140 μm, a line width of 20 μm, and a height of 120 μm was formed on the dielectric layer by photolithography using a photosensitive partition-forming paste by photolithography.

The paste used for pattern formation was prepared in the following procedure. The materials used are as follows. (Glass powder) Composition: 7% Li ₂ O, 22% SiO ₂ , B ₂ O ₃ 32
%, BaO 5%, Al ₂ O ₃ 22%, ZnO 2%,
MgO 6%, CaO 4% Thermophysical properties: glass transition point 491 ° C., softening point 528 ° C., coefficient of thermal expansion 74 × 10 ⁻⁷ / K (polymer) 40% methacrylic acid (MAA), 30%
Of methyl methacrylate (MMA) and 30% of styrene to the carboxyl groups of the copolymer.
4 equivalents of glycidyl methacrylate (GMA) subjected to an addition reaction, a 40% γ-butyrolactone solution of a photosensitive polymer having a weight average molecular weight of 43,000 and oxidation of 95 (monomer) X ₂ —N—CH (CH ₃ ) —CH ₂ — ( _{O-CH 2 -CH (CH 3} )) n NX 2 X: -CH 2 CH (OH) -CH 2 O-CO-C (CH 3) = CH 2 n = 2~10 ( photopolymerization initiator) IC -369: "Irgacure" -369 (Ciba
Geigy products) 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1 (plasticizer) DBP; dibutyl phthalate (organic dye) Sudan IV; azo-based organic dye, chemical formula C ₂₄ H ₂₀ N ₄ O, molecular weight 380.45 (solvent) γ-butyrolactone (dispersant) “NOPCOSPARS” 092 (manufactured by San Nopco) (stabilizer) 1,2,3-benzotriazole First, organic dye 0.08 parts by weight, dispersant 0.5 parts by weight to γ
-Butyrolactone was added to 8 parts by weight, and stirred at 50 ° C to obtain a uniform solution. To this solution, 38 parts by weight of a polymer, 15 parts by weight of a monomer, 3 parts by weight of a photoinitiator, 2 parts by weight of a plasticizer, and 3 parts by weight of a stabilizer were mixed and uniformly dissolved. Thereafter, this solution was filtered using a 400-mesh filter to produce an organic vehicle. 70 parts by weight of glass powder for partition walls was added to the organic vehicle, and mixed and dispersed with three rollers to prepare a photosensitive paste for forming partition walls. The viscosity of the photosensitive paste for forming the partition walls is 30,000
cps.

When the formed partition wall pattern was observed, several defects having a length of 100 μm were observed. The defect was corrected by the following procedure.

First, a paste for correcting partition walls was prepared as follows. The materials used are as follows (glass powder) Composition: 7% Li ₂ O, 22% SiO ₂ , B ₂ O ₃ 32
%, BaO 5%, Al ₂ O ₃ 22%, ZnO 2%,
MgO 6%, CaO 4% Thermophysical properties: glass transition point 491 ° C., softening point 528 ° C., coefficient of thermal expansion 74 × 10 ⁻⁷ / K (polymer) ethyl cellulose (solvent) γ-butyrolactone First, 15 parts by weight of the polymer is γ-butyrolactone. The resultant was added to 15 parts by weight, dissolved by heating with stirring, and then filtered through a 400-mesh filter to prepare an organic vehicle. 70 parts by weight of glass powder having the above composition was added to the organic vehicle, and kneaded with three rollers to prepare a paste for correcting partition walls. The viscosity of the correction paste was 30,000 cps.

The diameter of the tip of the needle for correction is 40 μm.
Was applied to the above-mentioned defect using a needle. After the needle was lowered into the paste receiver and the correction paste was attached to the tip of the needle, the needle was moved to the defective part, and the needle was dropped on the defective part to perform application. This operation is performed 3-4 times for one disadvantage.
After the repetition, the paste protruding from the upper portion was scraped off to make the height of the applied portion almost equal to the height of the peripheral portion. Using a laser focus displacement meter (for example, LT-8010 manufactured by KEYENCE CORPORATION), the height of the partition wall of the repaired part was compared with that of the other part by ± 1 μm.
Matched within. However, as compared with the peripheral partition walls, a slight lateral protrusion occurred.

The substrate was fired at 570 ° C. for 15 minutes in a firing furnace to form a stripe pattern having a line width of 20 μm and a height of 100 μm. When the height of the correction portion was measured by a laser focus displacement meter, it was 98 ± 1 μm, and the height variation was within 3 μm as compared with the peripheral portion.

The partition walls formed in this way have red,
A phosphor paste that emits blue and green light was applied by a screen printing method, and then fired (500 ° C., 30 minutes) to form a phosphor layer on the side and bottom of the partition to complete a back plate.

Next, a front plate was manufactured by the following steps. First, ITO is formed on the same glass substrate as the back plate by a sputtering method, then a resist is applied, and the thickness is 0.1 μm and the line width is 200 μm by an exposure / development process and an etching process.
Was formed. Also, by photolithography using a photosensitive silver paste made of black silver powder,
After firing, a bus electrode having a thickness of 10 μm was formed. Electrodes having a pitch of 140 μm and a line width of 60 μm were prepared.

Further, a transparent dielectric paste was applied to a thickness of 20 μm on the front plate on which the electrodes were formed, and baked at 430 ° C. for 20 minutes. Next, an MgO film having a thickness of 0.5 μm was formed using an electron beam evaporator so as to uniformly cover the formed transparent electrode, black electrode, and dielectric layer, thereby completing the front plate.

After the obtained front plate was bonded and sealed to the above-mentioned rear plate, a discharge gas was sealed therein, and a driving circuit was joined to produce a plasma display. Display was performed by applying a voltage to this panel. There was no display defect such as crosstalk due to the defect of the partition wall, and a favorable display state was shown.

Comparative Example 1 A plasma display panel was manufactured in the same procedure as in Example 1. However, as a result of baking without repairing the defect of the partition wall, the partition wall jumped up at the defect part of the partition wall. After applying the correction paste to the defective portion after firing in the same manner as in Example 1, re-firing was performed to correct the defective portion.
Due to the above-mentioned jump, the height of the partition wall at the correction portion was higher by 10 μm than at the periphery. When this panel is lit,
Display failure occurred due to gap unevenness caused by the jump of the defective portion.

[0037]

According to the present invention, the defective partition can be effectively corrected without impairing the shape of the peripheral partition, so that the yield of the discharge type display can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a defective partition wall before firing in the present invention.

FIG. 2 is a schematic diagram showing a state in which a correction paste is applied and molded to a defective portion in FIG. 1;

FIG. 3 is a schematic view showing a state in which the correction paste and the partition walls in FIG. 2 are baked.

FIG. 4 is a schematic view showing a defective portion of a partition wall which has jumped up by firing.

FIG. 5 is a schematic diagram of an AC (alternating current) plasma display panel back plate.

[Explanation of symbols]

 1: substrate 2: electrode 3: dielectric layer 4: partition 5: phosphor (red) 6: phosphor (green) 7: phosphor (blue) 8: partition break (before firing) 9: partition break (after firing) 10): Partition wall missing

Claims (6)

[Claims] In a method of manufacturing a discharge type display member having a partition on a substrate, a paste for repairing a partition is applied to a defective portion of the partition before a baking process of the partition, and then baked. The method for manufacturing a member for a discharge type display, wherein the method is modified. 2. A method for manufacturing a member for a discharge type display according to claim 1, wherein after applying the partition wall fixing paste, the difference between the height of the surrounding partition wall portion and the surrounding partition wall is within 5 μm. . 3. The method for manufacturing a member for a discharge type display according to claim 1, wherein after applying the partition wall repairing paste, the paste is molded so as to have a height equal to or lower than the height of the surrounding partition walls. 4. The discharge type display according to claim 1, wherein a difference between the softening point of the glass powder contained in the paste for correcting partition walls and the softening point of the glass constituting the surrounding partition walls is within 5 ° C. Manufacturing method of the member for use. 5. The method according to claim 1, wherein the difference between the weight content of the glass powder contained in the partition wall forming paste and the weight content of the glass powder contained in the partition wall modifying paste is within 5%. A method for producing a discharge type display member. 6. A method for manufacturing a discharge type display, comprising using a member for a discharge type display manufactured by the method according to claim 1.