JP2000169178A - Material for plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form partition walls excellent in alkali resistance and having a low dielectric constant by incorporating a glass powder having a specified composition. SOLUTION: The material for a plasma display panel contains a glass powder having a composition consisting of, by weight, 40-60% PbO, 1-25% B2O3, 15-40% SiO2, O-5% Al2O3, 0-10% ZnO, 0-5% TiO2, 0-5% ZrO2 and 0.1-10% Na2O+Li2O+ K2O. When the material is used as a partition wall forming material, it preferably contains a ceramic filler as well as the glass powder so as to maintain the shape of formed partition walls. The ceramic filler is, e.g. alumina, zirconia, zircon, titania, cordierite, mullite or silica. The content of the glass powder in the material is preferably 50-95 wt.% and that of ceramic fibers is preferably 5-50 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for a plasma display panel, and more particularly to a material suitable for forming a partition formed in a plasma display panel to partition discharge cells.

[0002]

2. Description of the Related Art A plasma display is a self-luminous type flat display, has excellent characteristics such as light weight and thinness, a wide viewing angle, and is easy to enlarge a screen. It is drawing attention as a device.

FIG. 1 is a sectional view showing the structure of such a plasma display panel. As shown in FIG.
In a plasma display panel, generally, a front glass substrate 1 and a rear glass substrate 2 are provided to face each other, and a space between these substrates is divided into a number of gas discharge parts. 7 are formed. A pair of transparent electrodes 3 are formed on the front glass substrate 1, and a voltage is applied between the transparent electrodes 3 to generate a plasma discharge. Usually, a metal electrode for reducing electric resistance is provided at an end of the transparent electrode 3, but this metal electrode is not shown in FIG.

[0004] A dielectric layer 5 is formed on the transparent electrode 3 so as to cover the entire surface of the front glass substrate 1. On the dielectric layer 5, MgO for stably forming plasma is formed.
Is formed.

[0005] On the back glass substrate 2 between the partitions 7, data electrodes 4 are formed. A phosphor 8 is applied between the partition walls 7 and on the side wall of the partition wall 7 and on the back glass substrate 2 so as to cover the data electrodes 4.

[0006] A voltage is applied between the transparent electrodes 3, whereby a plasma discharge is generated in the gas discharge section partitioned by the partition 7, and the ultraviolet light generated by the plasma discharge is irradiated on the fluorescent material 8 to emit light. .

In the above-mentioned plasma display panel, the partition 7 is usually formed on the rear glass substrate 2. Then, the rear glass substrate 2 on which the partition walls 7 are formed and the front glass substrate 1 are combined so as to face each other to form a panel. In the panel structure shown in FIG. 1, the partition walls 7 are formed directly on the back glass substrate 2. After forming a dielectric layer for protecting the electrodes covering the data electrodes 4 on the back glass substrate 2, A panel structure in which a partition is formed on the dielectric layer is also known.

[0008]

By the way, as a method of forming the partition, a printing lamination method, a sand blast method, and the like are known. The printing lamination method is a method in which printing is repeated a plurality of times by screen printing at a position where a partition is to be formed, and the partition is formed by laminating by overlaying.

In the sand blast method, a paste is applied by screen printing or the like and then dried, or a green sheet is placed thereon, and a partition material layer is formed directly on a rear glass substrate so as to have a predetermined thickness, or a dielectric layer is formed. Is formed over the entire surface, a photosensitive resist is coated thereon, exposed and developed, and thereafter, a portion where the resist film is not formed is removed by sandblasting to form a partition at a predetermined portion. How to

According to the sand blast method, the partition walls can be formed with higher precision than the printing and laminating method, and the tops of the partition walls can be made flat and the height thereof can be made uniform. For this reason, the sand blast method has recently been often used for forming the partition walls.

In such a sandblasting method,
After applying the resist as described above, it is necessary to expose and develop so as to form a predetermined pattern. As a developer,
Generally, an alkali solution is used, and therefore, the material used for the partition walls needs to have durability against the alkali solution.

However, the glass material used for the partition walls often contains a large amount of ceramic filler for maintaining the shape, and therefore, a glass material having a low softening temperature (softening point) is used. . However, conventional glasses having a low softening temperature generally have a problem of poor alkali resistance.

In recent years, it has been desired to reduce the driving voltage in order to reduce the power consumption of the plasma display panel. It has been known that such a driving voltage is affected by the dielectric constant of the glass material used for the partition wall material of the plasma display panel, and it has been found that the driving voltage can be reduced by using a glass material having a low dielectric constant. ing. Therefore, in order to reduce the driving voltage, a material for forming a partition wall having a low dielectric constant is required.

An object of the present invention is to provide a material for a plasma display panel which has excellent alkali resistance and can form a partition wall having a low dielectric constant.

[0015]

SUMMARY OF THE INVENTION A plasma display according to the present invention is provided.
The material for the play panel is PbO 40-6 in weight percentage.
0%, preferably 42-59%, more preferably 45%
~ 59%, B_TwoO_Three1-25%, preferably 2-22%,
More preferably 3 to 20%, SiO_Two15-40%,
Preferably 18 to 40%, more preferably 18 to 35
%, Al_TwoO_Three0-5%, preferably 1-5%, ZnO0
-10%, preferably 1-6%, TiO _Two0-5%, good
Preferably 0.01-4.5%, ZrO_Two0-5%, preferred
Or 0-4.5%, Na_TwoO and Li_TwoO and K_TwoTotal of O
Having a composition of 0.1-10%, preferably 0.5-7%
Characterized by containing a glass powder.

The glass used in the present invention contains a large amount of SiO ₂ in order to improve alkali resistance and obtain a low dielectric constant. However, PbO-B ₂ O ₃ -Si
In an O ₂ -based glass, when the content of SiO ₂ is increased, the softening point increases. Therefore, in the present invention, N
By including a specific amount of alkali components of a ₂ O, K ₂ O and Li ₂ O, the softening point is lowered without affecting the properties of alkali resistance and dielectric constant, and low-temperature firing is enabled.

The specific reasons for limiting the content of each component in the glass powder in the material for a plasma display panel of the present invention are as follows. PbO is a component that lowers the softening point, and if its content is less than the above range, the softening point will be high.
Sinterability at 0 ° C. becomes insufficient. If the content is more than the above range, the coefficient of thermal expansion increases and the dielectric constant also increases. In a plasma display panel, a window glass, a high strain point glass plate, or the like is generally used as a back glass substrate. Therefore, a glass material for a plasma display panel can be fired at 600 ° C. or less, and A material having a coefficient of thermal expansion close to the above is required.

B ₂ O ₃ is a component that widens the vitrification range. If the content is less than the above range, vitrification becomes difficult, and if it is more than the above range, alkali resistance is undesirably reduced.

SiO ₂ is a component that forms the skeleton of glass and a component that affects the dielectric constant. If the content is less than the above range, the alkali resistance decreases and the dielectric constant increases. Conversely, if it is more than the above range, the softening point will be high, and the sinterability at 600 ° C. when the ceramic powder is mixed may be insufficient.

Al ₂ O ₃ is a component that controls the phase separation of glass. However, if it exceeds 5% by weight, the softening point becomes too high, and the sinterability at 600 ° C. when ceramic powder is mixed is insufficient. It may be. ZnO is a component whose softening point can be adjusted while maintaining alkali resistance, but if it exceeds 10% by weight, the softening point tends to be too low.

Both TiO ₂ and ZrO ₂ are components for improving the alkali resistance. However, if their contents are more than 5% by weight, respectively, the softening point increases and
Glass is easily devitrified. Incidentally, the total amount of TiO ₂ and ZrO ₂ 0 to 5% is particularly preferably 0.01 to 5 wt%.

Na ₂ O, Li ₂ O, and K ₂ O are components that can adjust the softening point without increasing the dielectric constant.
If the total amount of these components is less than the above range, the effect of the present invention of lowering the softening point without increasing the dielectric constant cannot be sufficiently obtained. On the other hand, if it exceeds the above range, the thermal expansion coefficient becomes larger than that of the glass substrate, which is not preferable.
The contents of Na ₂ O and Li ₂ O are 0 to 8 respectively.
%, Especially 0.1 to 6%, and K ₂
The O content is preferably 0 to 8%, particularly preferably 0 to 6%.

It is preferable that two or more of these alkali components coexist. By coexisting two or more, the softening point can be adjusted by the mixed alkali effect without lowering the insulating property and without increasing the dielectric constant.

In the present invention, other glass components such as BaO and CaO may be contained in the glass powder, if necessary. The content of the other glass component is preferably 20% by weight or less, more preferably 15% by weight or less.

When the material of the present invention is used as a material for forming partition walls, it is preferable to include a ceramic filler for the purpose of maintaining the shape and the like. As such a ceramic filler, for example, alumina, zirconia, zircon,
Examples include at least one type of ceramic filler selected from titania, cordierite, mullite, silica, willemite, tin oxide, and zinc oxide. When used as a material for forming a partition wall, the content of the glass powder and the ceramic filler is, for example, 5 parts by weight in terms of weight percentage.
0 to 95%, preferably 50 to 80%, and 5 to 50%, preferably 20 to 50% of the ceramic filler. When the content of the ceramic filler is large, the sinterability may be insufficient and it may be difficult to form a dense partition wall.

Further, even when the material for a plasma display panel of the present invention is used for purposes other than the formation of barrier ribs, the above-mentioned material for adjusting the fluidity in the form of a paste, sinterability or thermal expansion coefficient is used. A ceramic filler may be added.

The material for a plasma display panel of the present invention can be used in the form of, for example, a paste or a green sheet. When used in paste form,
A thermoplastic resin, a plasticizer, a solvent and the like are used together with the above-mentioned glass powder and, if necessary, a ceramic filler. The content of the glass powder and the ceramic filler in the paste is generally about 30 to 90% by weight.

The thermoplastic resin increases the film strength after drying,
Further, it is a component that imparts flexibility, and its content is 0.1%.
It is generally about 1 to 20% by weight. As the thermoplastic resin, polybutyl methacrylate, polyvinyl butyral, polymethyl methacrylate, polyethyl methacrylate, ethyl cellulose and the like can be used, and these can be used alone or in combination.

The plasticizer is a component that controls the drying speed and imparts flexibility to the dried film. The content of the plasticizer is generally about 0 to 10% by weight. As the plasticizer, butylbenzyl phthalate, dioctyl phthalate, diisooctyl phthalate, dicapryl phthalate, dibutyl phthalate and the like can be used, and these can be used alone or in combination.

The solvent is a material for making the material into a paste, and its content is generally about 10 to 30% by weight. Examples of the solvent include terpineol, diethylene glycol monobutyl ether acetate, 2,2,4
-Trimethyl-1,3-pentadiol monoisobutyrate or the like can be used alone or in combination.

The paste can be prepared by preparing a glass powder and, if necessary, a ceramic powder, a thermoplastic resin, a plasticizer, a solvent and the like, and kneading them at a predetermined ratio to form a paste.

In order to form, for example, a partition using such a paste, first, these pastes are applied by using a screen printing method, a batch coating method, or the like, and a coating layer having a predetermined thickness is formed. After drying, a resist film is formed, and exposed and developed. Subsequently, unnecessary portions are removed by using a sand blast method, and then baked to obtain a partition having a predetermined shape.

When the material for a plasma display panel of the present invention is used in the form of a green sheet, together with the glass powder and, if necessary, a ceramic filler,
Use a thermoplastic resin, a plasticizer, or the like.

The content of the glass powder and the ceramic filler in the green sheet is generally about 60 to 80% by weight. As the thermoplastic resin and the plasticizer, the same thermoplastic resin and plasticizer as used in the preparation of the paste can be used, and the mixing ratio of the thermoplastic resin is about 5 to 30% by weight. Generally, the mixing ratio of the plasticizer is generally about 0 to 10% by weight.

As a general method for producing a green sheet, the above glass powder, and if necessary, a ceramic filler, a thermoplastic resin and a plasticizer are prepared, and a main solvent such as toluene, An auxiliary solvent such as alcohol is added to form a slurry, and the slurry is formed into a sheet on a film such as polyethylene terephthalate (PET) by a doctor blade method. After forming the sheet, the solvent and the solvent are removed by drying to obtain a green sheet.

The green sheet obtained as described above is thermocompression-bonded to a place where a glass layer is to be formed, and then fired to form a glass layer.
In the case of forming a partition, after forming a coating layer by thermocompression bonding, it is processed into a predetermined partition shape in the same manner as in the case of the paste described above.

In the above description, as a method of forming the partition wall, the sand blast method using a paste or a green sheet is described as an example, but the material for a plasma display panel of the present invention is limited to these methods. Instead, the material can be applied to other forming methods such as a printing lamination method, a lift-off method, a photosensitive paste method, a photosensitive green sheet method, and a press molding method. In particular, since it has excellent alkali resistance, it can be advantageously used for a formation method requiring alkali resistance.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the material for a plasma display panel of the present invention will be described with reference to specific examples. However, the present invention is not limited by the following examples.

Preparation of Glass Powder Glass materials such as various oxides and carbonates were prepared so as to have a glass composition shown in Table 1, mixed uniformly, put into a platinum crucible and melted at 1250 ° C. for 2 hours. To obtain a uniform glass body. This is pulverized by an alumina ball mill, and the aperture 5
Classification was performed using a 3 μm mesh sieve.

The softening point of the obtained glass powder was measured. The softening point is measured by a macro-type differential thermal analyzer,
The value of the fourth inflection point was taken as the softening point. Further, after the obtained glass powder was pressed into a disk shape, it was fired at each softening point temperature to obtain a disk-shaped sintered body. A 10% by weight aqueous solution of sodium carbonate was dropped on the obtained sintered body, put into a dryer set at 120 ° C., and the state of the surface of the sintered body after 10 minutes was observed. Was used to evaluate the alkali resistance. ：: A glossy and smooth surface state. ×: Surface with uneven surface without gloss.

The dielectric constant was determined by polishing a glass body formed using glass powder into a disk shape having a thickness of 2.0 mm and a diameter of 30 mm, and forming electrodes having a diameter of 20 mm on both surfaces of the disk-shaped glass. It was measured using a meter. Table 1 shows the evaluation results. In addition, in Table 1, the mixing ratio of each component shows weight%.

[0042]

[Table 1]

As is clear from the results shown in Table 1, the glass powders of Examples A to H according to the present invention have a softening point of 600 ° C. or lower, have good alkali resistance, and show a low dielectric constant. You can see that.

Evaluation of sinterability Each of the glass powders A to H was mixed so as to have the compounding ratio shown in Table 2.
Was mixed with a ceramic filler. Table 2
Are the percentages by weight.

The mixture of the glass powder and the ceramic filler obtained as described above is kneaded with a terpineol solution of ethyl cellulose to form a paste, and the paste is applied on a window glass by a screen printing method. After a layer having a thickness of 200 μm is formed, a dry film resist (DFR) is laminated thereon, and then, using this resist as a mask, a portion not covered with the resist is removed by sandblasting to form a partition. Formed. Next, the formed partition wall was baked at 560 ° C. for 10 minutes. The sinterability of the formed partition wall was evaluated as follows.

After the oil-based ink is applied onto the fired partition walls, it is wiped off with alcohol, and those which can be wiped off with good ink are marked with a circle in Table 2 as having good sintering properties. Those were indicated by X in Table 2 as poor sinterability.

[0047]

[Table 2]

As is clear from the results in Table 2, the glass ceramic composite materials of Examples 1 to 8 according to the present invention all show good sinterability. Therefore, it can be advantageously used as a material for forming a partition in a plasma display panel.

The material for a plasma display panel of the present invention can be fired at a temperature of 600 ° C. or less as described above, and has a low dielectric constant. Therefore, by using the material as a partition wall forming material, the driving voltage of the plasma display panel can be reduced and power consumption can be reduced. Therefore, it is useful as a partition wall forming material of a plasma display panel. However, the material for a plasma display panel of the present invention is:
It is not limited to such a material for forming a partition,
It can also be used to form other parts of the plasma display panel. For example, it can be used for forming a dielectric layer provided on a front glass substrate or a rear glass substrate, and is particularly useful when a low dielectric constant or alkali resistance is required.

[0050]

The material for a plasma display panel of the present invention is a material having excellent alkali resistance and a low dielectric constant. Therefore, when used as a material for forming a partition,
The dielectric constant of the partition can be reduced, and the driving voltage of the plasma display panel can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a plasma display panel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 front glass substrate 2 rear glass substrate 3 transparent electrode 4 data electrode 5 dielectric layer 6 protective layer 7 partition wall (barrier rib) 8 phosphor

Claims (4)

[Claims] 1. PbO 40 to 60% by weight, B
_{2 O 3 1~25%, SiO 2} 15~40%, Al 2 O 3 0~
5%, ZnO 0-10%, TiO ₂ 0-5%, ZrO ₂₀
5%, the total of Na ₂ O and Li ₂ O and K ₂ O 0.1 to 10
%. A material for a plasma display panel, comprising a glass powder having a% composition. 2. The ceramic filler according to claim 1, wherein at least one selected from alumina, zirconia, zircon, titania, cordierite, mullite, silica, willemite, tin oxide, and zinc oxide is contained as a ceramic filler. For plasma display panels. 3. Glass powder 50 to 95 in weight percentage.
%, And a ceramic filler of 5 to 50%. 4. The material for a plasma display panel according to claim 2, wherein the material according to claim 2 is a material for forming a partition in a plasma display panel.