JP2000313637A - Low melting point glass for coating electrode and glass ceramic composition for coating electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain low melting point glass which is used for coating electrodes, can form a glass coating layer on the electrode in a single layer structure, has a low dielectric constant, and does no require another coating on a driving circuit wiring portion. SOLUTION: This low melting point glass comprises 20 to 60 wt.% of PbO, 0 to 30 wt.% of Bi2O3, 20 to 55 wt.% of B2O3, 0 to 10 wt.% of SiO2, 0 to 15 wt.% of Al2O3, 0 to 35 wt.% of MgO+CaO, 0 to 35 wt.% of BaO, and 0 to 8 wt.% of ZnO. The low melting point glass preferably further contains SnO2 and/or CeO2 in an amount of <=4.8 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ITO (tin-doped indium oxide) or tin oxide (fluorine,
Includes tin oxide doped with antimony, and the like. The present invention relates to a low-melting-point glass suitable for insulatingly covering a transparent electrode such as a transparent electrode and a plasma display device.

[0002]

2. Description of the Related Art In recent years, thin flat panel color display devices have attracted attention. In such a display device, an electrode must be formed in each pixel in order to control a display state in a pixel forming an image. A transparent electrode is used as such an electrode in order to prevent deterioration in image quality. As the transparent electrode, a thin film of ITO or tin oxide formed on a glass substrate is often used.

In particular, a transparent electrode formed on a surface of a glass substrate used as a display surface of the display device is processed into a thin line to realize a fine image. In order to control each pixel independently, it is necessary to ensure the insulation between the finely processed transparent electrodes. However, when moisture is present on the surface of the glass substrate or when an alkali component is present in the glass substrate, a slight current may flow through the surface of the glass substrate. In order to prevent such a current, it is effective to form an insulating layer between the transparent electrodes. Further, in order to prevent deterioration of image quality due to the insulating layer formed between the transparent electrodes,
This insulating layer is preferably transparent.

Various insulating materials for forming such an insulating layer are known, and among them, a glass material which is a transparent and highly reliable insulating material is widely used. Recently, a plasma display device expected as a large flat color display device (typically, a cell is defined by a front substrate, a rear substrate, and a partition used as a display surface, and a plasma discharge is generated in the cell. In a front substrate of a display device that forms an image by generating the same (hereinafter referred to as a PDP), a glass coating layer having excellent plasma durability for protecting the transparent electrode from plasma is essential.

[0005] Also, on the rear substrate of the PDP, the electrodes formed thereon are covered with a glass coating layer.
For this glass coating layer, high light reflectivity is often required in order to effectively use light generated by plasma from the phosphor formed on the partition wall as display light,
Further, a light shielding property may be required to prevent the light from escaping from the rear substrate.

There is a method of forming such a glass coating layer under a vacuum by a sputtering method or the like. However, a method of pasting a low-melting glass powder, applying the paste on a glass substrate, and firing it has been widely used. .

[0007] The electrodes of the drive circuit wiring portion must be exposed. Conventionally, for example, Japanese Unexamined Patent Application Publication No.
24, the driving circuit wiring portion is coated with a ZnO-containing paste having excellent acid solubility, which is different from the paste used for the glass coating layer, and finally, an acidic solution such as dilute nitric acid is used. The leverage had been removed.

[0008]

In order to suppress the reaction between the transparent electrode and the glass coating layer when the glass coating layer is formed on the transparent electrode by firing the low melting point glass powder, Japanese Patent Application Laid-Open No.
-105855 discloses a glass coating layer having a two-layer structure in which a high softening point glass layer is a lower layer and a low softening point glass layer is an upper layer. However, there is a problem that the number of steps is increased as compared with a glass coating layer having a single-layer structure.

Further, the dielectric constant of the conventional glass coating layer was high. Therefore, there has been a problem that the capacitance of the cell is increased, the discharge current per plasma emission is large, and the power consumption of the PDP is high. Japanese Patent Application Laid-Open No. 8-77930 discloses a glass coating layer having a relative dielectric constant of 8 or less, which prevents a reaction between the electrode and the glass coating layer and prevents the alkali component of the glass coating layer from diffusing into the electrode. To prevent this, a protective layer is formed between the electrode and the glass coating layer.

As for the exposure of the electrodes in the drive circuit wiring portion, use of a glass coating layer which is easily soluble in acid is disclosed in Japanese Patent Application Laid-Open No. HEI 11 (1999).
0-316451. This eliminates the need for separate coating of the drive circuit wiring,
It is possible to avoid an increase in types of coating materials and an increase in steps. However, the relative permittivity of the glass coating layer disclosed herein is 1
This is a high value of 5, and the above-mentioned problem concerning the dielectric constant remains.

According to the present invention, the glass coating layer can be formed into a single-layer structure, the dielectric constant is low, and there is no need to perform another coating on the driving circuit wiring portion. An object of the present invention is to provide a glass-ceramic composition for electrode coating that does not require coating, and a low-melting glass for electrode coating and / or a plasma display device using the glass-ceramic composition for electrode coating.

[0012]

SUMMARY OF THE INVENTION The present invention is substantially represented by mass percentage based on the following _{oxides, PbO 20~60%, Bi 2 O} 3 0~30%, B 2 O 3 20~55%, _{SiO 2 0~10%, Al 2 O} 3 0~15%, MgO + CaO 0~35%, SrO 0~35%, BaO 0~35%, ZnO 0~ 8%, for covering electrodes low melting point glass made of, and And a glass-ceramic composition for coating an electrode, comprising an inorganic pigment powder in a proportion of 0.5 to 40 parts by mass with respect to 100 parts by mass of the low-melting glass powder for forming an electrode.

The present invention also provides a plasma display device having a front substrate, wherein a transparent electrode on a glass substrate constituting the front substrate is covered with the low-melting glass for covering the electrode, and a back substrate. Provided is a plasma display device, wherein an electrode on a glass substrate constituting a rear substrate is coated with a fired body of the glass ceramic composition for coating an electrode.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The low melting glass for electrode coating of the present invention (hereinafter simply referred to as the glass of the present invention) is usually used in the form of powder. The glass powder of the present invention is made into a glass paste using an organic vehicle or the like for imparting printability, and this is applied onto an electrode formed on a glass substrate and fired to cover the electrode. In PDP, the glass of the present invention is suitably used for coating a transparent electrode on a front substrate.

The glass of the present invention has a softening point of 520 to 650.
C. is preferred. The reason is described below. The glass substrate usually has a glass transition point of 550 to 62.
The one at 0 ° C. is used. In this case, in order to avoid deformation of the glass substrate, the firing of the glass paste is performed at 620 ° C.
This is done below. In order to perform firing at 620 ° C. or less,
The softening point of the glass of the present invention is preferably 650 ° C. or less. Further, the temperature is preferably 650 ° C. or lower so that the glass of the present invention softens and flows at the early stage of the baking to completely cover the electrode and prevent the deterioration of the electrical characteristics of the electrode. The temperature is more preferably 640 ° C or lower.

On the other hand, on the front substrate of PDP, ITO
Alternatively, if the electrical resistance is too high with only a transparent electrode such as tin oxide, Ag, Al, or a three-layer C
A metal layer such as r-Cu-Cr (hereinafter, this metal layer is referred to as a metal electrode) may be formed. Softening point is 520 ° C
If these metal electrodes are covered with less than the glass, the metal electrodes may be eroded or the erosion of the transparent electrode may be accelerated via the metal electrodes. 550-62
When performed at 0 ° C., the erosion of these electrodes becomes significant when the metal electrodes are coated with glass having a softening point of less than 480 ° C. When the metal electrode is covered with glass having a softening point of less than 480 to 520 ° C., erosion of the electrode is eliminated, but bubbles in the glass layer become large at the time of firing and the transmittance is reduced.

Therefore, the softening point of the glass of the present invention is 52
The temperature is preferably 0 ° C. or higher. More preferably 550
° C or higher, particularly preferably 580 ° C or higher. When the softening point is 520 ° C. or higher, the glass coating layer can have a single-layer structure. Further, if the softening point is 580 ° C. or higher, there is a possibility that the organic vehicle in the glass paste completely volatilizes before the softening flow completely starts, and carbides of the organic vehicle remain in the glass coating layer to lower the transmittance. Few. That is, there is a high possibility that the transmittance of the glass coating layer can be increased.

As the glass substrate, one having an expansion coefficient of 80 × 10 ^{−7 to} 90 × 10 ⁻⁷ / ° C. is usually used. Therefore, in order to match the expansion characteristics with such a glass substrate, and to prevent the glass substrate from warping or lowering its strength, the glass of the present invention has an average linear expansion coefficient of 50 to 350 ° C. (hereinafter simply referred to as expansion coefficient). Is 60 × 10 ^-7
It is preferably 90 × 10 ⁻⁷ / ° C. More preferably, it is 70 × 10 ^{−7 to} 85 × 10 ⁻⁷ / ° C.

The relative permittivity of the glass of the present invention is preferably 10.5 or less. If it exceeds 10.5, the capacitance of the cell of the PDP becomes too large, and the power consumption of the PDP may increase. More preferably, it is 10.0 or less.

The glass of the present invention is easily soluble in acid, and the drive circuit wiring portion can be coated with the glass of the present invention, so that another coating is not required. In this case, the coating of the drive circuit wiring portion is subjected to an acid treatment, and the coating is dissolved and removed. Note that the coating prevents oxidation of the driving circuit wiring portion during firing, that is, deterioration of electrical characteristics.

The glass of the present invention is substantially represented by mass percentage based on the following _{oxides, PbO 20~60%, Bi 2 O} 3 0~30%, B 2 O 3 20~55%, SiO 2 0~ _{10%, Al 2 O 3 0~15} %, MgO + CaO 0~35%, SrO 0~35%, BaO 0~35%, ZnO 0~ 8%, consisting of.

[0022] Preferably, _{substantially, PbO 20~55%, Bi 2 O} 3 0~20%, B 2 O 3 30~50%, SiO 2 0~ 7%, Al 2 O 3 0~10%, MgO + CaO 0 to 30%, SrO 0 to 30%, BaO 0 to 30%, ZnO 0 to 5% (preferable composition A).

More preferably, 22 to 40% of PbO, 35 to 50% of B ₂ O ₃ , 0 to 5% of SiO _2, 0 to 5% of Al ₂ O _3, 0 to 25% of SrO, and BaO 0 ~30%, ZnO 0~ 5%, made free of Bi ₂ O _3, MgO and CaO in a substantially (more preferred composition B).

Hereinafter, the reasons for limiting the composition will be described with reference to the percentage by mass. PbO has an effect of lowering the softening point and increasing the expansion coefficient, and is an essential component. At over 60%
There is a possibility that the relative permittivity may be increased, or there is a possibility that the color is colored yellow. Preferably it is 55% or less. 2
If it is less than 0%, the softening point becomes too high, the expansion coefficient becomes too small, and the phases may be separated. Preferably it is 22% or more. In particular, in order to increase the transmittance, the content is preferably set to 22 to 40%.

Bi ₂ O ₃ is not an essential component, but may be contained up to 30% in order to lower the softening point and increase the expansion coefficient. If it exceeds 30%, the expansion coefficient may become too large, or coloring may occur. Preferably it is 20% or less. Particularly, in order to increase the transmittance, it is preferable to set the transmittance to substantially 0%, that is, the impurity level.

B ₂ O ₃ is an essential component for stabilizing glass. If it exceeds 55%, the softening point becomes too high, and phase separation may occur. Preferably it is 50% or less. 20
%, There is a possibility that PbO or Bi ₂ O ₃ becomes excessively large, and may be colored yellow. It is preferably at least 30%, more preferably at least 35%.

Although SiO ₂ is not an essential component, it may be contained up to 10% for stabilizing the glass. If it exceeds 10%, the softening point may be too high and it may be difficult to dissolve in acid. It is more preferably at most 7%, particularly preferably at most 5%.

The ratio of the content of SiO _{2 to} the total amount of SiO ₂ and B ₂ O ₃ , that is, SiO ₂ / (SiO ₂ + B ₂ O ₃ ) is preferably 0.2 or less. If it exceeds 0.2, it may be difficult to dissolve in acid. It is more preferably 0.15 or less.

Al ₂ O ₃ is not an essential component, but may be contained up to 15% for glass stabilization. If it exceeds 15%, devitrification may occur. It is more preferably at most 10%, particularly preferably at most 5%.

Neither MgO nor CaO is an essential component, but may contain up to 35% in total in order to improve water resistance or prevent phase separation. If it exceeds 35%, devitrification may occur. Preferably it is 30% or less. Particularly, in order to increase the transmittance, it is preferable to set the transmittance to substantially 0%, that is, the impurity level.

SrO is not an essential component, but may be contained up to 35% in order to improve water resistance or prevent phase separation. If it exceeds 35%, devitrification may occur. It is preferably at most 30%, more preferably at most 25%.

BaO is not an essential component, but may be contained up to 35% in order to improve water resistance or prevent phase separation. If it exceeds 35%, devitrification may occur. Preferably it is 30% or less.

Although ZnO is not an essential component, it may be contained up to 8% in order to lower the softening point. If it exceeds 8%, the dielectric constant may be too large. It is more preferably at most 5%.

The glass of the present invention consists essentially of the above components, but other components may be added up to 5% in total.
Here, 5% is the amount of addition, which is 4.8% (= 5 × 100/105) in terms of the content.

For example, SnO ₂ and / or CeO ₂
May be contained in a total amount of up to 4.8% in order to increase the transmittance of the glass coating layer obtained by firing. If it exceeds 4.8%, coloring caused by SnO ₂ and CeO ₂ may be remarkable, and the transmittance may be reduced. The contents of SnO ₂ and CeO ₂ are more preferably 3% or less, respectively. Particularly preferably, they are each 2% or less, most preferably 1.5% or less. In the “preferred composition A” and the “more preferred composition B”, Sn
The contents of O ₂ and CeO ₂ are each preferably 2% or less, and more preferably 1.5% or less, respectively.

Further, in order to adjust the softening point and expansion coefficient, to improve the stability and chemical durability of the glass, etc., T
_{iO 2, ZrO 2, La 2} O 3, etc. may be added. Further, an alkali metal oxide such as Li ₂ O, Na ₂ O and K ₂ O and a halogen component such as F may be added in order to lower the softening point within a range that does not impair the insulating property.

The temperature for firing the glass of the present invention (hereinafter referred to as firing temperature) is preferably lower than the softening point, and the difference from the softening point is preferably 20 to 40 ° C. Outside this range, the transmittance may decrease. Particularly preferably, said difference is between 25 and 35C.

Next, the glass-ceramic composition for coating an electrode of the present invention (hereinafter simply referred to as the glass-ceramic composition of the present invention) will be described. The glass ceramic composition of the present invention is made into a paste using an organic vehicle or the like. The paste-formed glass-ceramic composition of the present invention is applied to an electrode formed on a glass substrate and fired to form a fired body, which covers the electrode. In PDP, the glass ceramic composition of the present invention is suitably used for coating an electrode on a rear substrate.

The inorganic pigment is an essential component of the glass ceramic composition of the present invention, and imparts light-reflecting or light-blocking properties to the fired body. In order to impart light reflectivity, it is preferable to use a white inorganic pigment. This white inorganic pigment,
More preferably, it is at least one selected from the group consisting of TiO ₂ , Al ₂ O ₃ and ZrO ₂ .

In order to impart light-shielding properties, it is preferable to use a black inorganic pigment. This black inorganic pigment is composed of Cr ₂
More preferably, it is at least one selected from the group consisting of O ₃ , MnO ₂ , Fe ₂ O ₃ , CoO, NiO, CuO, and composite oxides thereof.

When the content of the inorganic pigment is more than 40 parts by mass with respect to 100 parts by mass of the glass powder of the present invention, the glass cannot be sufficiently softened and flowed at the time of firing, and bubbles generated at the time of firing remain in the fired body. There is a risk. Preferably it is 30 parts by mass or less. If the amount is less than 0.5 parts by mass, sufficient light reflectivity or light-shielding property may not be obtained.

The glass-ceramic composition of the present invention contains the powder of the glass of the present invention and the powder of an inorganic pigment as essential components, but the other components may be added to the glass of the present invention within a range not to impair the object of the present invention. It may be contained up to 30 parts by mass based on 100 parts by mass of the powder. For example, when used for coating an electrode of a PDP rear substrate, a filler such as silica or tin oxide may be contained.

A fired body of the glass ceramic composition of the present invention
Has an expansion coefficient of 60 × 10^-7~ 90 × 10^-7/ ° C
Is preferred. More preferably 70 × 10^-7~ 85x
10 ^-7/ ° C. The reason is that the glass of the present invention
For the same reason.

Next, the plasma display device of the present invention (hereinafter referred to as the PDP of the present invention) will be described. In the first aspect of the PDP of the present invention, the transparent electrode on the front substrate of the PDP is coated with the glass of the present invention.

In a preferred embodiment of the first aspect of the PDP of the present invention, a transparent electrode is formed on a glass substrate, and the transparent electrode is coated with the glass of the present invention. The transmittance is 70% or more, and the turbidity is 30% or less. The transmittance is 70%
If the turbidity is less than 30% or more than 30%, the image quality of the PDP deteriorates. The transmittance is more preferably at least 75%, particularly preferably at least 80%. The turbidity is more preferably at most 25%, particularly preferably at most 20%. A typical value of the transmittance and the turbidity of the glass substrate itself used as the front substrate is a glass substrate thickness of 2.8 mm.
Are 90% and 0.4%, respectively.

The transparent electrode has a width of, for example, 0.5 mm.
And the strip electrodes are formed so as to be parallel to each other. The distance between each strip-shaped electrode center line is, for example, 0.1 mm.
In this case, the ratio of the transparent electrode occupying the surface of the glass substrate is 50 to 60%.

In a second embodiment of the PDP of the present invention,
The electrode on the back substrate of the PDP is coated with the glass ceramic composition of the present invention.

The PDP of the present invention is manufactured as follows, for example, if it is of the AC type. As shown in FIG. 1, a patterned transparent electrode 2 and bus lines (not shown) are formed on the surface of a glass substrate 1a. Next, the glass layer 3 is formed by applying and firing the glass powder of the present invention. Finally, a layer of magnesium oxide (not shown) is formed as a protective film to form a front substrate 10. On the other hand, a patterned address electrode 5 is formed on the glass substrate 1b. Next, the partition 6 is formed in a stripe shape, and the phosphor layer 4 is further printed and fired to form the rear substrate 20.

A sealing material (not shown) is applied to the periphery of the front substrate 10 and the rear substrate 20 with a dispenser, and the transparent electrode 2
After assembling such that the address electrodes 5 face each other, firing is performed to obtain a plasma display device. Then, the inside of the plasma display device is evacuated, and Ne
And a discharge gas such as He-Xe. Although the above example is of an AC type, the present invention can be applied to a DC type.

[0050]

EXAMPLES Lead oxide, bismuth oxide, boric anhydride, silica sand, alumina, magnesium oxide, calcium carbonate, strontium carbonate, barium carbonate were prepared so as to have the composition shown by mass percentage in the columns from PbO to CeO _{2 in the} table. , Zinc oxide, tin oxide, and cerium oxide were mixed and mixed. Next, this mixed raw material was melted in a 1300 ° C. electric furnace using a platinum crucible for 1 hour, and formed into a thin glass sheet. This thin glass sheet was pulverized with a ball mill to obtain low melting glass powder (Examples 1 to 35). The ratio of the content of SiO _{2 to} the total amount of SiO ₂ and B ₂ O ₃ , SiO ₂ / (SiO ₂ + B
₂ O ₃ ) is also shown in the table.

The softening point (unit: ° C.), expansion coefficient (unit: 10 ⁻⁷ / ° C.) and relative permittivity are shown in the table. The relative permittivity was measured for Examples 1 to 24. Softening point: Measured using a differential thermal analyzer. Expansion coefficient: After molding the powder of the low melting glass, the fired body obtained by firing at the firing temperature (unit: ° C.) shown in the table for 10 minutes is processed into a cylindrical shape having a diameter of 5 mm and a length of 2 cm, and is measured with a thermal dilatometer. 50
The average linear expansion coefficient at ~ 350 ° C was measured. Relative permittivity: The fired body is 50 mm × 50 mm × thickness 3 m
m, electrode is deposited on the surface and frequency is 1MHz
Was measured.

With respect to the low melting point glasses of Examples 1 to 24, 100 g of the powder was kneaded with 25 g of an organic vehicle to prepare a glass paste. The organic vehicle can be obtained by adding ethyl cellulose to diethylene glycol monobutyl ether acetate or α-terpineol in a mass percentage of 7%.
~ 18% dissolved.

Next, a film thickness of 200 nm and a width of 0.5 mm
The distance between the center lines of each ITO transparent electrode
Are formed in parallel so that the size is 1.0 mm.
For glass substrate of 10cm × 10cm, thickness 2.8mm
I thought. This glass substrate has a composition expressed as a percentage by mass.
But SiO_Two: 58, Al_TwoO_Three: 7, Na_TwoO: 4, K _Two
O: 6.5, MgO: 2, CaO: 5, SrO: 7, B
aO: 7.5, ZrO_Two: 3, glass transition point is 626
° C, expansion coefficient 83 × 10^-7/ ° C, which is glass
You. The ITO transparent electrode is formed on one side of a glass substrate.
Has been established.

30 mm on which an ITO transparent electrode is formed
The glass paste was uniformly screen-printed on a portion of × 30 mm, and then dried at 120 ° C. for 10 minutes. The glass substrate was heated at a heating rate of 10 ° C./min until the firing temperature (unit: ° C.) shown in the table was reached.
Hold for a minute and bake. The thickness of the glass coating layer covering the transparent electrode was 22 to 25 μm.

For the fired glass substrate, 550 nm
Were measured for light transmittance (unit:%) and turbidity (unit:%). Transmittance: Self-recording spectrophotometer U-35 manufactured by Hitachi, Ltd.
The transmittance of light having a wavelength of 550 nm was measured using 00 (integrating sphere). The state without the sample was defined as 100%. The transmittance is preferably 70% or more.

Turbidity: A haze meter (C light source using halogen bulb) manufactured by Suga Test Instruments Co., Ltd. was used. The light from the halogen sphere is converted into a parallel light beam through a lens, is incident on the sample, and is transmitted by the integrating sphere to the total light transmittance _Tt and the diffuse transmittance _Td.
Was measured. Turbidity was calculated by turbidity (%) = (T _d / T _t ) × 100. It is preferably at most 30%.

For the low melting glasses of Examples 25-35,
100 parts by mass of the powder was mixed with the amount of white inorganic pigment shown in parts by mass in the column of inorganic pigment in the table to prepare a mixed powder. 100 g of the mixed powder and 25 g of the organic vehicle used in Examples 1 to 24 were kneaded to obtain a glass paste.

This glass paste was uniformly screen-printed on a 45 mm × 25 mm area substantially at the center of one side of the glass substrate, and then dried at 120 ° C. for 10 minutes. The glass substrate was heated at a heating rate of 10 ° C./min until the sintering temperature shown in the table was reached, and the sintering was maintained at that temperature for 30 minutes. The thickness of the glass coating layer formed on the glass substrate was 20 μm.

In order to evaluate whether or not the glass coating layers obtained in Examples 1 to 35 are easily soluble in acid, an acid dissolution test described below was performed, and the acid dissolution time (unit: minute) was measured. The results are also shown in the table. Acid dissolution test: The glass substrate on which the glass coating layer was formed was immersed in nitric acid having a mass percentage concentration of 5% at 20 ° C. for a maximum of 60 minutes, and the weight of the immersed glass substrate was measured. An immersion time at which the weight of the glass substrate after immersion was equal to the weight of the glass substrate before immersion was determined, and this immersion time was defined as the acid dissolution time. The acid dissolution time is preferably 10 minutes or less.

Examples 1 to 21 are examples that can be used for coating a transparent electrode on a PDP front substrate, and Examples 25 to 34 are PDPs.
Example 2 which can be used for coating an electrode on a rear substrate.
Examples 2 to 24 and Example 35 are comparative examples.

[0061]

[Table 1]

[0062]

[Table 2]

[0063]

[Table 3]

[0064]

[Table 4]

[0065]

[Table 5]

[0066]

By using the glass of the present invention, the glass coating layer covering the transparent electrode on the glass substrate can have a single-layer structure, and the number of steps can be reduced. Further, the dielectric constant of the glass coating layer can be reduced, and the power consumption of the PDP can be reduced. The glass coating layer formed on the glass substrate using the glass of the present invention or the glass ceramic composition of the present invention is easily soluble in acid and can be used for coating the drive circuit wiring portion. Therefore, it is not necessary to provide a coating that is particularly easily soluble in acid only on the drive circuit wiring portion.

Further, the glass of the present invention can be used as a low-melting glass used in the glass-ceramic composition of the present invention, and can be used for both a front substrate and a rear substrate of a PDP. The front substrate of the PDP of the present invention has high transmittance and excellent image quality. Furthermore, since it is manufactured using the glass of the present invention or the glass-ceramic composition of the present invention, manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a plasma display device of the present invention.

[Explanation of symbols]

 1a: Glass substrate 1b: Glass substrate 2: Transparent electrode 3: Glass layer 4: Phosphor layer 5: Address electrode 6: Partition wall 7: Discharge space 10: Front substrate 20: Back substrate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 11/02 H01J 11/02 B (72) Inventor Masamichi Yata 1-8 Koriyama, Machiikedai, Koriyama-shi, Fukushima Asahi Glass Koriyama Electric Materials Co., Ltd. Inside the corporation

Claims (11)

[Claims] 1. A substantially by mass percentage based on the following _{oxides, PbO 20~60%, Bi 2 O} 3 0~30%, B 2 O 3 20~55%, SiO 2 0~10%, Al _A low-melting glass for electrode coating comprising: 0 to 15% ₂ O _{3, 0 to} 35% MgO + CaO, 0 to 35% SrO, 0 to 35% BaO, and 0 to 8% ZnO. _{2. It} contains SnO ₂ and / or CeO ₂ ,
The low melting glass for electrode coating according to claim 1, wherein the total of these contents is 4.8% or less in terms of mass percentage. 3. The softening point is 520 to 650 ° C.
Or the low-melting glass for electrode coating according to 2. 4. The low melting glass for electrode coating according to claim 1, wherein the average linear expansion coefficient at 50 to 350 ° C. is 60 × 10 ^{−7 to} 90 × 10 ⁻⁷ / ° C. 5. The method according to claim 1, wherein the relative dielectric constant is 10.5 or less.
5. The low-melting glass for coating an electrode according to any one of 4. 6. A glass-ceramic composition for electrode coating comprising the low-melting glass for electrode coating according to any one of claims 1 to 5 and a powder of an inorganic pigment, wherein the powder of the low-melting glass for electrode coating is provided. A glass-ceramic composition for electrode coating, comprising 0.5 to 40 parts by mass of the inorganic pigment powder with respect to 100 parts by mass. 7. An inorganic pigment comprising TiO ₂ , Al ₂ O ₃ and Z
7. At least one member selected from the group consisting of rO _2.
The glass-ceramic composition for coating an electrode according to the above. 8. The glass-ceramic composition for coating an electrode according to claim 6, wherein the average linear expansion coefficient at 50 to 350 ° C. is 60 × 10 ^{−7 to} 90 × 10 ⁻⁷ / ° C. 9. A plasma display device having a front substrate, wherein a transparent electrode on a glass substrate constituting the front substrate is coated with the low-melting glass for electrode coating according to any one of claims 1 to 5. Plasma display device. 10. The plasma display device according to claim 9, wherein the front substrate has a transmittance of light having a wavelength of 550 nm of 70% or more and a turbidity of 30% or less. 11. A plasma display device having a rear substrate, wherein electrodes on a glass substrate constituting the rear substrate are coated with the fired body of the glass-ceramic composition for electrode coating according to claim 6. Plasma display device.