JPH10326571A - Partition wall for plasma display panel and method of manufacturing the same - Google Patents

Abstract

(57) Abstract: Disclosed is a discharge display in which a shape defect of a partition constituting a discharge display cell of a PDP is reduced, and a sectional shape of a partition base integrated with a back plate forms a curved surface having a uniform radius of curvature. A partition wall for a PDP having a discharge display cell with a uniform and uniform thickness, a high-definition phosphor layer formed on the bottom of the cell, and easy to increase the size of the screen, and a method for efficiently manufacturing the partition wall at a low cost I will provide a. SOLUTION: The partition wall forming composition layer coated on the back plate is plastically deformed to obtain a partition wall formed body, and the partition wall formed body is subjected to binder removal treatment together with the back plate, and then fired and integrated to form a partition base. A partition wall for a plasma display panel having a curved surface having a radius of curvature in the range of 10 to 100 μm is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PDP for forming a discharge display cell of a plasma display panel (hereinafter abbreviated as PDP) used for a high-precision, inexpensive, lightweight, thin, large-screen color image display device or the like. The present invention relates to a partition and a method for manufacturing the partition.

[0002]

2. Description of the Related Art Conventionally, CRTs have been widely used as image display devices. However, these CRTs have disadvantages such as a large external volume, a large weight, a high voltage, and the like. With the spread of multimedia, flat image display devices such as light emitting diodes (LEDs), liquid crystal display devices (LCDs), and PDPs have been developed as information interfaces, and the range of use thereof has been expanding.

[0003] Among them, the PDP has been attracting attention as a large-screen color image display device which uses plasma emission, has a large screen, has high image quality, is thin and lightweight, and can be installed anywhere.

Such a PDP is provided with two flat insulating substrates, a back plate and a front plate, and an electrode group facing a minute discharge display cell surrounded by a partition partitioning the space, and a rare gas or the like is provided in the space. Has a structure in which a discharge gas is hermetically sealed, a voltage is selectively applied between the opposing electrodes, plasma is generated by the discharge, and the plasma causes the phosphor in the discharge display cell to emit light. It is used as a light emitting element.

In general, as a method of manufacturing the barrier ribs constituting the discharge display cell of the PDP, a paste made of a barrier rib forming composition is repeatedly printed and dried in a barrier rib pattern on a back plate by a screen printing method to meet a predetermined necessity. A method of forming a partition wall shape by stacking up to a certain height is well known.

However, in this method, the thickness of a film that can be formed by one printing is about 10 μm, so that printing and drying are repeated for about 100 to 200 μm.
Since a partition wall of a discharge display cell requiring a certain height is formed, it is necessary to repeat the printing / drying process many times to laminate.

Therefore, the number of steps is extremely increased, dripping is accumulated, the bottom of the partition wall is widened, the bottom of the partition wall is disturbed at the contact portion between the back plate and the partition wall due to the mesh of the printing plate, Due to the misalignment of the partition walls, the partition walls are easily deformed, and good dimensional accuracy cannot be obtained due to elongation of the printing plate making. Therefore, there is a limit in forming the partition walls at a fine pitch, and a demand for higher definition is required. In addition, there is a problem that the yield is extremely low because it is necessary to print accurately for each layer.

Therefore, as a method of solving such a problem, a partition wall material is formed in a layer on a back plate with a required thickness,
A method has been proposed in which an unnecessary portion is ground and removed by sand blasting using a mask pattern to form a partition having a desired shape (see Japanese Patent Application Laid-Open No. 8-115669).

[0009]

According to the sand blasting method, a sharp cross section of the partition wall can be formed, and the bottom processing of the partition wall and the expansion of the bottom of the partition wall do not occur as in the printing lamination method. In the method, most of the material of the partition other than the portion where the partition is to be formed has to be removed by grinding, and there has been a problem that the cost is high.

[0010] When an extremely narrow and narrow partition is formed in order to form a discharge display cell with higher definition,
As the height of the partition walls increases, the rigidity of the partition walls in a direction perpendicular to the arrangement direction of the partition walls decreases, so that cracks occur during the formation of the partition walls or during firing, or chipping occurs during handling after forming the partition walls. .

Further, when the partition wall formed body having the steep cross-sectional shape is fired, the corners 17 formed by the back plate 15 and the partition base 16 are irregularly rounded as shown in FIG. When the phosphor layer 19 is formed on the bottom of the phosphor layer 18, the filling of the phosphor may be insufficient, the thickness of the phosphor layer may vary, or a crack 20 may occur at the time of baking, resulting in a decrease in luminous efficiency and a variation in luminance. was there.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to reduce the shape defects such as chipping of a partition wall constituting a discharge display cell of a PDP to improve the production yield. The height of the phosphor layer formed on the bottom of the discharge display cell has a curved surface with a uniform radius of curvature, with a high-precision and fine pitch, and the cross-sectional shape of the partition base integrated with the back plate is uniform. In addition, a PDP partition wall having a large number of discharge display cells having a uniform and crack-free so-called high-definition, for example, a screen having a size as large as 30 inches or more can be easily formed, and such a PDP partition wall can be inexpensively and efficiently manufactured. It is to provide a manufacturing method.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in view of the above-mentioned problems, and as a result, the partition walls constituting the discharge display cell formed by plastically deforming the partition wall forming composition are formed at the base of the partition wall connected to the back plate. Since the cross-sectional shape is a curved surface having a constant radius of curvature, it is possible to prevent shape defects such as cracks in the partition walls and chips during handling, and defects such as cracks with a uniform thickness at the bottom of the discharge display cell. It has been found that a phosphor layer free of defects can be formed and high definition can be realized.

That is, the partition wall for a PDP of the present invention has a curved surface having a radius of curvature in a range of 10 to 100 μm, which is formed by plastically deforming the partition wall forming composition and integrated with the back plate. Is characterized by the following.

In the method for producing a partition wall for a PDP according to the present invention, first, a partition wall forming composition is formed in a predetermined thickness on a back plate, and then the coating layer is plastically deformed to form a partition wall shape. To obtain a partition wall molded body, the cross-sectional shape of the partition wall base integrated with the back plate after debinding with the back plate to which the partition wall molded body is bonded is also a curved surface having a radius of curvature in the range of 10 to 100 μm. It is characterized in that a formed partition wall for a plasma display panel is obtained.

Further, as another method for producing a partition wall for a PDP of the present invention, a partition wall forming die is directly pressed against a partition wall forming composition to be plastically deformed, and a back plate is pressed on the obtained partition wall formed body. The partition wall molded body is brought into close contact with each other, and after removing the binder in the same manner as described above, the cross-sectional shape of the partition wall base integrated with the back plate has a curved surface having a radius of curvature in the range of 10 to 100 μm. It is characterized by obtaining.

In particular, as a method of forming a partition wall by plastically deforming the partition wall forming composition, a plurality of grooves corresponding to the partition wall shape are engraved, and a convex edge corresponding to a base of the partition wall is formed with a predetermined curvature. The method of forming a partition wall by pressing and rotating a roll-shaped mold having an arc-shaped cross section is pressed.

[0018]

According to the partition wall for a PDP of the present invention and the method for manufacturing the same, the partition wall for a PDP constituting the discharge display cell has a curved surface in which the cross-sectional shape of the partition wall integrated with the back plate has a certain range of curvature. The manufacturing method is to form a partition by plastically deforming the coating layer of the composition for forming a partition formed on the back plate, to form a partition, and after debinding the obtained partition molded body, firing and integrating with the back plate. Therefore, the cross-sectional shape of the partition base becomes a curved surface having a uniform curvature, the stress concentration at the partition base can be reduced, and the partition cross-sectional area can be increased as compared with the partition having only the sharply elongated cross-sectional shape. It is possible to increase the rigidity of the partition walls in the direction orthogonal to the arrangement direction of the partition walls, reduce the shape defects such as deformation and chipping of the partition walls, improve the production yield, and improve the partition walls having a uniform curved surface at the base of the partition walls. Sex good, can be obtained in a simple process, the phosphor layer can also be formed uniformly, it is possible to greatly reduce the manufacturing cost.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a partition wall for a PDP according to the present invention and a method for manufacturing the same will be described in detail with reference to the drawings.

FIG. 1 shows a PDP having a partition wall for a PDP of the present invention.
FIG. 2 is a perspective view showing an embodiment of the DP, and FIG.
It is a principal part sectional view for demonstrating a partition for DP.

In FIG. 1 and FIG. 2, reference numeral 1 denotes an insulating substrate 4 forming a back plate 2 and a front plate 3 facing each other;
And a discharge display cell 5 having a phosphor 8
Is a partition wall for PDP.

The partition wall 1 for PDP has a uniform curved surface 11 in which the cross-sectional shape of the partition wall base 10 integrated with the back plate 2 is within a certain radius of curvature.

In the present invention, the radius of curvature of the curved surface 11 formed by the cross-sectional shape of the partition base 10 integrated with the back plate 2 is at least 1 even if it is a part of the curved surface 11 when viewed from the center of the discharge display cell 5.
When the thickness is less than 0 μm, the effect of reducing the deformation and chipping of the partition is small, and when it exceeds 100 μm, the toughness of the partition is improved, but the light emitting space is narrowed and the luminance is reduced.

Therefore, the radius of curvature of the curved surface 11 formed by the cross-sectional shape of the partition base 10 is within the range of 10 to 100 μm, regardless of the size of the discharge display cell 5. Even a curved surface may be any of various shapes, such as an elliptical shape having a continuously changing curvature, and particularly from 15 to 70 μm in terms of ease of producing a partition mold.
Is preferred.

Next, in the method of manufacturing a partition wall for a PDP according to the present invention, as shown in FIG. 3, the coating layer 12 of the partition wall forming composition formed on the back plate 2 is plastically deformed to form a partition base. The PDP partition wall 1 is formed so as to form a curved surface 11 having a constant curvature.

In particular, a roll-shaped mold 14 in which a plurality of grooves 13 corresponding to the shape of the partition walls are engraved, and both end edges of a convex portion corresponding to the bottom between the partition walls are rounded at a predetermined curvature to form a curved surface, is used. By pressing the coating layer 12 of the molding composition while rotating it in the direction of the arrow, the coating layer 12 is plastically deformed to capture the partition shape, and a partition wall molded body having a curved surface 11 at the partition base adhered to the back plate 2 is formed. What is obtained is the most efficient one that can be mass-produced with high accuracy.

The means for plastically deforming the coating layer of the partition wall forming composition is not particularly limited. For example, various forming dies such as a flat plate or a roll having a cross section corresponding to the cross-sectional shape of the partition are placed on the back plate. In addition to pressing the coating layer formed to form a partition wall molded body, or pressing the partition wall forming die against the partition wall forming composition, or pressing the partition wall forming composition and plastically deforming, the back plate is formed thereon. After transferring by pressing, the mold may be released and the partition wall molded body may be brought into close contact with the back plate.

The partition wall forming composition may be any glass material which becomes vitreous after firing and can maintain airtightness. For example, a mixture of a low melting point glass powder and an oxide ceramic powder may be used as an inorganic material. It can be used as a component, and a mixture of the inorganic component and an organic substance such as a binder, a solvent, and various additives can be appropriately prepared and used according to a method of forming a partition wall.

The organic material suitable for the partition wall forming composition having plastic deformability is, for example, a thermoplastic binder such as an acryl-based or butyral-based binder, an ultraviolet curable resin, a photocurable resin, A reaction curable resin such as a curable resin can be used.

On the other hand, the method for imparting plastic deformation to the coating layer of the composition for forming a partition formed on the back plate is as follows, except that the organic substance exhibiting plastic deformation is previously added to the composition for forming a partition. First, after forming a coating layer on the back plate, post-treatments such as drying and gelling may be performed to impart plastic deformability.

The partition mold may be made of metal, resin, rubber, or the like. The shape of the mold may be any of a flat plate and a columnar shape having projections and depressions corresponding to the partition walls formed on the surface thereof. But it is good.

As the insulating substrate used for the back plate and the front plate of the present invention, a transparent glass substrate such as soda lime glass, low soda glass, lead alkali silicate glass and borosilicate glass can be used. High strain point low soda glass is preferred.

The electrode is formed using a conductive metal such as Ag, Ni, or Al, or an alloy thereof, or a conductive paste obtained by mixing the conductive metal or its alloy with a small amount of glass. A transparent electrode on which indium oxide, tin oxide, or the like is deposited is formed on a front plate, which is an insulating substrate on the display surface side.

Xe, He-Xe, Ne-Xe, or the like can be used as a main component of the discharge gas to be hermetically sealed. A discharge display cell can be formed by sealing the discharge gas at 10 to 600 Torr.

[0035]

Next, the barrier ribs for PDP of the present invention and the method for producing the same were evaluated as follows.

Example 1 First, an electrode having a width of 50 μm was stripped on a back plate made of soda lime glass having a thickness of 2 mm and 30 inches in size using an electrode paste containing Ag as a main component by a thick film printing method. The electrode was formed on the entire surface at a pitch of 220 μm and baked to produce a back plate with electrodes.

On the other hand, the cross-sectional shape of the partition base has a curved surface of about 9 μm in curvature as viewed from the center of the discharge display cell and has a width of 40 μm.
A plate-shaped metal partition wall forming mold having a large number of partition-shaped concave grooves having a height of 200 μm and a pitch of 220 μm was prepared.

Next, on the back plate with electrodes, a partition wall forming composition comprising a low melting glass powder, a butyral resin, a solvent and a dispersant was uniformly applied by a roll coater to form a coating layer. A flat-plate-shaped metal partition wall mold is pressure-pressed to the back plate on which the coating layer is formed, and the coating layer made of the partition wall forming composition is plastically deformed to give a partition wall shape. Molding was performed to form a molded partition on the back plate.

Next, after the back plate to which the above-mentioned partition wall molded body has been adhered is held at a predetermined temperature to remove the binder, the firing atmosphere is appropriately changed according to the main components of each material, and firing is performed at a temperature of 550 to 580 ° C. for 10 minutes. P for evaluation integrated with back plate
A partition wall for DP was produced.

When the cross-sectional shape of the base of the thus obtained PDP partition for evaluation was enlarged and observed with a scanning electron microscope (SEM), it had a uniform curved surface with a curvature of about 10 μm.

First, a back plate with electrodes having a pre-fired partition wall molded body was used, and a row of 1.0 atm air blown at a height of 10 cm from the back plate with the partition side of the back plate facing upward was used. After forcibly passing under the air shower,
The rigidity of the partition walls was evaluated by counting the number of defects such as deformation and chipping of the partition walls per unit area (cm ² ) for a total of five partitions at the center and four corners of the back plate.

Further, the PDP partition for evaluation after firing was passed under a row of air showers that blows air at 5.0 atm. Was evaluated for rigidity.

A glass layer having a thickness of 200 μm was formed on the back plate by using a glass paste, and after drying, a glass pattern was formed using a stripe-shaped mask pattern having a partition wall width of about 40 μm. A comparative example was prepared by using a bead as a cutting powder and forming a partition wall by a sandblast method in which the ejection pressure was set to about 1.5 to 3.0 kgf / cm ² .

The sectional shape of the base of the molded partition wall obtained in the comparative example had linearity, and the partition wall was formed substantially at right angles to the back plate.

As a result, in the comparative example, the number of defects per unit area of the molded partition wall was 10 at the center of the back plate, 11 at the upper right end, 12 at the lower right end, and 9 at the lower left end. Pieces,
Thirteen were found at the upper left end, and the rigidity of the partition wall was low. In contrast, in the PDP partition molded body of the present invention, only one defect was recognized at the center of the back plate, but the other parts were deformed. No chipping was observed at all, and it was confirmed that the rigidity of the partition walls was high.

(Example 2) The composition for forming a partition wall of Example 1 was uniformly applied on the back plate of Example 1 by a roll coater, and then dried at a temperature of 80 ° C for 1 hour. A PDP partition for evaluation was prepared in the same manner as in Example 1.

The base cross-sectional shape of the thus obtained PDP partition wall for evaluation was measured in the same manner as in Example 1.
It had a uniform curved surface with a curvature of about 13 μm.

Further, as a result of evaluation in the same manner as in Example 1, in the partition wall for PDP of the present invention, no defect such as deformation or chipping was observed in any of the partition wall molded body and the sintered body thereof, Was confirmed to have high rigidity.

Example 3 Using the same partition wall forming composition and the partition wall forming mold as in Example 1, a block of the partition wall forming composition was pressed against the partition wall forming mold and plastically deformed to form a partition wall formed body. Thereafter, a rear plate was pressure-bonded to the partition molded body to make the partition molded body adhere thereto, and after removing the binder, it was fired to produce a PDP partition for evaluation integrated with the rear plate.

Then, when evaluated in the same manner as in Example 1, a uniform curved surface having a curvature of about 10 μm was obtained. The PDP partition wall of the present invention had no defects such as deformation and chipping before and after firing. It was confirmed that the rigidity of the partition walls was extremely high.

(Example 4) Instead of the plate-shaped metal partition wall forming die of Example 1, the cross-sectional shape of the partition base was about 2 mm on the surface.
It has a curvature of 5 μm, a partition wall width of 35 μm and a height of 20
On a back plate on which a coating layer of the same partition-forming composition as in Example 1 was formed using a roll-shaped metal partition-wall forming die in which a plurality of concave grooves corresponding to partition walls having a pitch of 0 μm and 150 μm were formed. Is rolled under pressure, and the coating layer is plastically deformed to give a partition wall shape.
A partition wall for P was produced.

The evaluation was performed in the same manner as in Example 1 using the PDP partition walls for evaluation obtained as described above.
A uniform curved surface of μm was obtained, and no defects such as deformation or chipping were observed in the PDP partition wall of the present invention before and after firing, and it was confirmed that the partition wall had extremely high rigidity.

(Example 5) Instead of the plate-shaped metal partition wall forming die of Example 1, the cross-sectional shape of the partition base was about 5 mm on the surface.
It has a curvature of 0 μm, a partition wall width of 40 μm and a height of 20
A PDP partition for evaluation was produced in the same manner as in Example 2 using a roll-shaped metal partition wall forming die in which a plurality of concave grooves corresponding to the partition having a pitch of 220 μm were formed at 0 μm.

The obtained PDP barrier for evaluation was prepared in Example 1.
When evaluated in the same manner as above, a uniform curved surface with a curvature of about 55 μm was obtained, and no defects such as deformation and chipping were observed in the PDP partition wall of the present invention before and after firing. It was confirmed that it was high.

(Example 6) Instead of the plate-shaped metal partition wall mold of Example 1, the cross-sectional shape of the partition base was about 9 on the surface.
It has a curvature of 5 μm, a partition wall width of 40 μm and a height of 20
A PDP partition for evaluation was produced in the same manner as in Example 2 using a roll-shaped metal partition wall forming die in which a plurality of concave grooves corresponding to a partition having a pitch of 0 μm and a pitch of 250 μm were formed.

The obtained partition wall for PDP for evaluation was prepared in Example 1.
When evaluated in the same manner as above, a uniform curved surface having a curvature of about 100 μm was obtained, and no defect such as deformation or chipping was observed in the PDP partition wall of the present invention before or after firing.
It was confirmed that the partition walls had extremely high rigidity.

The present invention is not limited to the above-described embodiment.

[0058]

According to the partition wall for a PDP and the method of manufacturing the same according to the present invention, the sectional area of the partition wall constituting the discharge display cell of the PDP can be increased, and the rigidity of the partition wall in the direction perpendicular to the arrangement direction of the partition walls. And the shape defects such as deformation and chipping of the partition are reduced, the production yield is improved, and the productivity is enhanced. In addition, the partition having a base having a uniform curved surface can be easily formed.

Accordingly, the phosphor layer formed at the bottom of the discharge display cell has a high precision and fine pitch, and the cross-sectional shape of the partition base integrated with the back plate forms a curved surface having a uniform radius of curvature. A PDP partition wall which is uniform in thickness, has no cracks, and has a large number of so-called high-definition discharge display cells, and can be easily formed into a large screen of, for example, 30 inches or more. A good manufacturing method is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a PDP having a PDP partition wall of the present invention.

FIG. 2 is a cross-sectional view of a main part for explaining a PDP partition wall of the present invention.

FIG. 3 is a perspective view showing a preferred embodiment of a method of manufacturing a partition wall for PDP of the present invention.

FIG. 4 is a cross-sectional view of a main part for describing a conventional PDP partition.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Partition wall for PDP 2 Back plate 3 Front plate 4 Insulating substrate 5 Discharge display cell 6, 7 electrode 8 Phosphor 9 PDP 10 Partition wall base 11 Curved surface 12 Coating layer of composition for partition molding 13 Groove 14 Roll mold

Claims (4)

[Claims] A plurality of discharge display cells are constituted by an insulating substrate forming an opposing back plate and a front plate, and a partition partitioning an opposing space between the insulating substrates, and a plurality of electrode groups are formed in the discharge display cells. A plasma display which is hermetically sealed with a discharge gas, selectively applies a voltage between the electrodes to generate plasma, and causes a phosphor formed on the inner wall of the discharge display cell to emit light, thereby serving as a light emitting element of an image display device. A panel,
The sectional shape of the base of the partition wall integrated with the back plate is 10 to 1
A partition wall for a plasma display panel, having a curved surface having a radius of curvature in a range of 00 μm. 2. A coating layer comprising a composition for forming a partition wall is formed on a back plate, and the coating layer is plastically deformed to form a partition wall formed body. Then, after debinding, firing and integration with the back plate. A method of manufacturing a partition for a plasma display panel, comprising obtaining a partition for a plasma display panel having a curved surface having a radius of curvature in a range of 10 to 100 [mu] m. 3. A partition mold is pressed against the composition for forming a partition to plastically deform to form a partition mold, and then a back plate is pressed onto the partition mold to bring the partition mold into close contact therewith, thereby removing binder. Thereafter, the partition wall base integrated with the back plate is fired to obtain a partition wall for a plasma display panel having a curved surface having a radius of curvature in a range of 10 to 100 μm. Method. 4. The partition wall molded body is formed by pressing a roll-shaped mold having a plurality of grooves corresponding to the partition wall shape into a partition wall forming composition and plastically deforming the same. The method for producing a partition wall for a plasma display panel according to claim 2 or 3.