JP2000351650A - Black stripe material for plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a black stripe material for a plasma display panel capable of forming a fine and precise pattern by using a screen printing. SOLUTION: This black stripe material comprises 50-80 wt.% of a glass powder, 10-40 wt.% of a black pigment powder and 0-15 wt.% of a ceramic powder and has <=10 μm maximum grain diameter of the respective powders and <=2 μm 50% grain diameter. The glass powder preferably has a composition of 50-75 wt.% of PbO, 1-15 wt.% of B2O3, 10-20 wt.% of SiO2, 0-5 wt.% of Al2O3, 0-10 wt.% of ZnO and 0.01-6 wt.% total amount of TiO2 and ZrO2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black stripe material for a plasma display panel.

[0002]

2. Description of the Related Art A plasma display panel is a self-luminous type flat display, has excellent characteristics such as light weight and thinness, a wide viewing angle, and the like, and is capable of realizing a large screen. It is receiving attention as one of certain display devices.

[0003] By the way, plasma display panels are
It is pointed out that the contrast is insufficient. Therefore, conventionally, measures such as providing an anti-reflection filter on the surface of the panel, making the lower layer of the bus electrode black, making the top of the barrier ribs black, reducing the number of times of priming, and providing a color filter have been taken.

Recently, in addition to these measures, a black stripe (black band) has been formed between bus electrodes formed on the front plate.

[0005]

Generally, a black stripe is required to have a very fine and accurate pattern having a thickness of about 5 μm or less and a width of about 250 μm. For this formation, there are known a method of forming by photolithography using a photosensitive material and a method of forming by screen printing using a glass paste. However, with a conventional glass paste, a film having a thickness of 5 μm or less is formed. It is difficult to form by screen printing. Therefore, at present, the method of forming by photolithography is mainly used. However, in terms of cost, screen printing is very advantageous,
There is a demand for a screen-printable black stripe material having a small film thickness and high pattern maintenance.

An object of the present invention is to provide a black stripe material for a plasma display panel, which can form a fine and accurate pattern by using screen printing.

[0007]

As a result of various experiments, the present inventors have found that the above object can be achieved by restricting the composition ratio and the particle size distribution of the solids in the paste to specific ranges. It is proposed as the present invention.

That is, the black stripe material for a plasma display panel according to the present invention contains 50 to 8 glass powders.
0% by weight, 10 to 40% by weight of a black pigment powder, and 0 to 15% by weight of a ceramic powder, wherein each of the powders has a maximum particle diameter of 10 μm or less and a 50% particle diameter of 2 μm or less. .

The black stripe paste for a plasma display panel according to the present invention is characterized by containing the above-mentioned material in a solid content of 20 to 50% by weight.

Further, the glass composition for forming a black stripe of the present invention contains 50 to 75% by weight of PbO and B ₂
O ₃ 1 to 15%, SiO ₂ 10 to 20%, Al ₂ O ₃
0-5%, ZnO 0-10%, TiO ₂ + ZrO ₂
It has a composition of 0.01 to 6%.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The black stripe material for a plasma display panel according to the present invention contains glass powder, black pigment and ceramic powder as main components. Each of these powders has a maximum particle diameter of 10 μm or less (preferably 5 μm or less) and a 50% particle diameter of 2 μm or less (preferably 1.5 μm or less).
m) or less. If the particle diameter is out of this range, the thickness after firing becomes 5 μm or more, which is larger than the thickness of the bus electrode, and the surface undulation of the front dielectric layer formed thereon becomes large, causing display unevenness. Will be.

The glass powder used in the present invention is a component for fixing the black pigment and for controlling the reflectance by suppressing the scattering of light at the pigment grain boundaries (between the particles). It is 50-80%, preferably 60-80%.
If the glass powder content is less than 50%, the sinterability deteriorates and 8
If it is more than 0%, the proportion of the black pigment becomes relatively low, the hiding power becomes low, and the black pigment does not function. Further, it is preferable to use a glass having a low softening point (550 ° C. or lower) as the glass powder. This is because despite the fact that the black stripe material contains a large amount of black pigment powder and ceramic powder, it is necessary to form a dense glass film by firing at 500 to 600 ° C. In addition, since a wet mixing process is widely used for pulverizing and uniformly mixing glass, it is preferable to use glass having high chemical durability, particularly high moisture resistance. If the chemical durability is low, B ₂ O ₃
Ingredients and the like begin to melt and foam during baking.

[0013] In order to meet such demands, weight
PbO 50-75% (preferably 55-70%)
%), B_TwoO_Three 1 to 15% (preferably 3 to 10%),
SiO _Two 10 to 20% (preferably 11 to 18%),
Al_TwoO_Three 0-5% (preferably 0.01-3%), Z
nO 0-10% (preferably 5-9%), TiO_Two+
ZrO_Two 0.01-6% (preferably 0.1-5)
Glass compositions having a composition are included. Having the above composition
Glass has good fluidity at temperatures of 500-600 ° C
, And because of its high moisture resistance,
The powder surface does not change even when subjected to processing, and baking without foaming
A membrane can be obtained.

The reasons for limiting the composition range of the above glass will be described.

PbO is a component that lowers the softening point.
If the content of PbO is less than 50%, the softening point exceeds 550 ° C, and sufficient sinterability cannot be obtained at 600 ° C or less, and if it exceeds 75%, the thermal expansion coefficient becomes too high.

B ₂ O ₃ is a component that widens the vitrification range. If B ₂ O ₃ is less than 1%, vitrification becomes difficult,
If it is more than 15%, the chemical durability decreases.

SiO ₂ is a component that forms the skeleton of glass. If the content of SiO ₂ is less than 10%, the chemical durability decreases, and if it exceeds 20%, the softening point exceeds 550 ° C.

[0018] Although Al ₂ O ₃ is a component for stabilizing the glass is not preferable because the softening point exceeds 5% higher.

ZnO is a component for adjusting the softening point.
If it exceeds 10%, the softening point becomes too high.

TiO ₂ and ZrO ₂ have the effect of improving the chemical durability while maintaining a low softening point. If the total amount is less than 0.01%, the effect is not obtained. If the total amount is more than 6%, crystals are easily precipitated and vitrification becomes difficult.
It is desirable that the contents of TiO ₂ and ZrO ₂ are each 0 to 3%.

In addition to the above components, for example, BaO and CaO can be added in a total amount of up to 20%, preferably up to 10% for adjusting the coefficient of thermal expansion.

The black pigment powder used in the present invention comprises:
It is a component for imparting hiding power to the material, and its content is 10 to 40%, preferably 20 to 40%. If the amount of the black pigment powder is less than 10%, the hiding power is reduced and the black pigment does not function, and if it exceeds 40%, the sinterability deteriorates and a uniform film cannot be obtained. As the black pigment, for example, a Cr-based pigment such as a Cr-Cu-Mn-based pigment or an Fe-based pigment such as an Fe-Mn-based pigment can be used.

The ceramic powder used in the present invention is a component added for improving the pattern accuracy.
Its content is 0 to 15%, preferably 0 to 10%. If the amount of the ceramic powder is more than 15%, the sinterability is deteriorated. In addition, as the ceramic powder, alumina, silica,
Zircon, zirconia, titania, cordierite and the like can be used.

Next, a method of forming a black stripe using the above-described material will be described.

First, the above-mentioned material is used as a solid content, kneaded with a solvent or a binder to form a paste. Here, the ratio of the solid content in the paste is 20 to 50% by weight (preferably 3%).
(0 to 50% by weight). 2 solids
If it is 0% or less, the viscosity becomes too low to make screen printing difficult, or it becomes difficult to obtain a desired film thickness after firing, and if it exceeds 50%, the film thickness becomes thicker than 5 μm.

Next, a paste is applied between the bus electrodes on the front glass plate by a screen printing method.

Thereafter, by firing at a temperature of 600 ° C. or less, a black stripe can be formed.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

Table 1 shows examples (samples A to E) of the glass used in the present invention.

[0030]

[Table 1]

Each glass sample was prepared as follows.
First, glass raw materials were prepared so as to have the composition shown in the table, uniformly mixed, and then placed in a platinum crucible and melted at 1250 ° C. for 2 hours. Thereafter, the molten glass was pulverized with alumina balls and classified to obtain a glass powder sample. About the obtained glass, the softening point, the thermal expansion coefficient, and the moisture resistance were evaluated. The results are shown in the table.

As a result, the glass sample used in the present invention had a softening point of 490-570 ° C., a coefficient of thermal expansion at 30-300 ° C. of 69-82 × 10 ^-7 / ° C., and good moisture resistance. .

The softening point of the glass was measured using a macro differential thermal analyzer, and the value of the fourth inflection point was taken as the softening point. The coefficient of thermal expansion is determined by powder press molding and firing each sample, polishing it to a cylindrical shape having a diameter of 4 mm and a length of 40 mm, and measuring 30 to 30 to
The value in the temperature range of 300 ° C. was determined. Moisture resistance is 2
The surface of the glass left in pure water at 5 ° C. for 100 hours was observed, and the glass having no deterioration was evaluated as “good”.

Next, a black stripe paste was prepared using the above glass powder sample. Tables 2 and 3 show examples (sample Nos. 1 to 8) and comparative examples (sample No. 9) of the present invention.
Is shown.

[0035]

[Table 2]

[0036]

[Table 3]

Each sample was prepared as follows. First, the glass powder, the black pigment powder, and the ceramic powder were wet-pulverized to a desired particle size using an attritor, then dried and crushed. The powder was then mixed with a 5% terpineol solution of ethylcellulose to make a paste.

Subsequently, the paste was screen-printed on a soda-lime glass plate and dried. Then, it was placed in an electric furnace and fired at 560 ° C. for 10 minutes. The glass film thus obtained was evaluated for the presence or absence of foaming, transmittance and reflectance, fired film thickness, surface roughness Ra, and pattern retention.

As a result, in Example No. of the present invention, 1
In the glass films formed using the pastes Nos. To 8, no foaming was observed and the sinterability was good. 7% transmittance
Hereinafter, the reflectance was 6% or less, and the concealing property was high. Moreover, the calcined film thickness is 5 μm or less, and the surface roughness Ra is 0.6 μm.
It was also found that the pattern retention was good and that fine and accurate pattern formation was possible.

On the other hand, the comparative example No. In the glass film using the paste No. 9, no foaming was observed, and the sinterability was good. However, the transmittance is 10% and the reflectance is 10
% And the concealability was somewhat inferior. Moreover, the fired film thickness is 10μ.
m, the surface roughness Ra was 1.0 μm, and the pattern retention was poor.

The black pigment powder is composed of Cr-based Cr-based powder.
The Cu-Mn pigment was used as the Fe-Mn pigment as the Fe-based pigment. The presence or absence of foaming was determined by observing the glass film with an electron microscope, and the case where bubbles of 1 μm or more were not observed was evaluated as “absent”. The transmittance and the reflectance were obtained by measuring the transmittance and the reflectance at 550 nm of a glass film formed by applying a paste by screen printing and firing at 500 ° C. using a spectrophotometer. The fired film thickness and the surface roughness Ra were measured with a surface roughness meter. The pattern retention is about 100 width paste by screen printing.
The pattern shape when applied in the form of a μm stripe and baked at 560 ° C. was observed with a metallographic microscope. "Poor".

[0042]

As described above, by using the material of the present invention, a black stripe having a fine and accurate pattern can be formed by screen printing. Therefore, it is suitable as a black stripe forming material for a plasma display panel.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G059 AA08 AB05 AC08 CA01 CA08 CB09 EA01 EA18 EB09 4G062 AA08 AA09 AA15 BB04 DA04 DB01 DB02 DB03 DC03 DC04 DD01 DE01 DE02 DE03 DF06 DF07 EA01 EA10 EB01 EC01 FA01 EF01 EF01 FB02 FB03 FC01 FC02 FC03 FD01 FE01 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ05 JJ07 NN07 NN10 KK03 NN10 KK03 PP13 PP14 5C040 GH07 JA12 KA04 KA09 KA10 KA11 KB03 KB09 KB14 KB19 MA02 MA04 MA24

Claims (4)

[Claims] 1. A glass powder of 50 to 80% by weight, a black pigment powder of 10 to 40% by weight, and a ceramic powder of 0 to 15%.
A black stripe material for a plasma display panel, wherein the powder has a maximum particle diameter of 10 μm or less and a 50% particle diameter of 2 μm or less. 2. The glass powder is composed of PbO 5
_{0~75%, B 2 O 3 1~15} %, SiO 2 10~20
_{%, Al 2 O 3 0~5%} , 0~10% ZnO, TiO
₂ + black stripe material for plasma display panel of claim 1, characterized in that it has a composition of ZrO ₂ 0.01 to 6%. 3. The method according to claim 1, wherein the solid content is 20%.
A black stripe paste for a plasma display panel, which is contained in an amount of about 50% by weight. 4. Black of a plasma display panel
Black stripe used for stripe formation material
A forming glass composition, comprising PbO 5
0-75%, B_TwoO_Three 1 to 15%, SiO_Two 10-2
0%, Al_TwoO _Three 0-5%, ZnO 0-10%, Ti
O_Two+ ZrO_Two It has a composition of 0.01 to 6%.
A glass composition for forming a black stripe.