JP2002343237A - Manufacturing method and device for plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve the problem of foreign matters getting mixed in an applied liquid film and its existence in the form of the foreign or a bubble in a dielectric layer after baking, when forming various protruding parts, such as an electrode or black stripes by a screen printing method or a die coating method and then forming the dielectric layer thereon. SOLUTION: Static is removed from a substrate 1, gas 15 is blown against the substrate 1 to clean it, and a thick film is applied on the glass substrate 1, using a paste containing organic high polymer material and a low melting point glass substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a plasma display, and more particularly to a method for manufacturing a plasma display in which a foreign substance and bubbles in a paste are eliminated in forming a thick dielectric film using the paste to improve the pressure resistance. The present invention relates to a method and an apparatus.

[0002]

2. Description of the Related Art In recent years, in the OA field and the AV field, there has been an increasing demand for colorization of large flat displays. As a large-sized color flat display that meets such a demand, there is a color plasma display panel (hereinafter, referred to as a color PDP).

A color PDP has a front glass substrate (front panel), a rear glass substrate (back panel), and partitions arranged so as to form a large number of cells therebetween. Electrodes corresponding to each cell are arranged in a direction orthogonal to each other on opposing surfaces of each substrate. The partition walls are provided irrespective of the type of AC or DC discharge. By regulating the distance between the two glass substrates by the partition walls, an appropriate discharge gap can be secured and crosstalk to adjacent cells can be prevented. Usually, the partition walls of the AC type color PDP are formed in a stripe shape. R (red), G
The phosphor layers of three colors (green) and B (blue) are formed, and an inert gas is sealed therein. In such a color PDP, a color image is displayed by applying a voltage between the electrodes in accordance with an image signal to cause a gas discharge in a desired cell and cause the phosphor layer to emit light. .

[0004] This type of color PDP is manufactured as follows. First, various projections, such as electrodes and partitions, are formed on a glass substrate, and a front panel panel and a rear panel panel are manufactured. Enclose active gas. Finally, the control circuit and the chassis are assembled to complete the color PDP.

In manufacturing a front panel, first, a transparent electrode is formed on a glass substrate. Subsequently, bus line electrodes are formed by a screen printing method, and black stripes are formed between the bus line electrodes by a screen printing method. A dielectric layer is formed on the projection by a screen printing method or a die coating method, and a protective film is deposited.

FIG. 3 is a view showing a manufacturing process of the plasma display panel. In this manufacturing process of the surface plate, first,
A front glass substrate 1 is prepared. As shown in FIG. 3A, first, the front glass substrate 1 has a viscosity of 10 to 45 Pa · s.
Black silver paste 2 is uniformly applied on the entire surface by a screen printing method, and dried at about 90 ° C. for about 10 minutes.
Subsequently, as shown in FIG.
a · s silver paste 3 is uniformly applied to the entire surface by a screen printing method, and dried at about 90 ° C. for about 10 minutes. The film thickness at this time is 12 μm ± 1.5 μm.
Subsequently, as shown in FIG. 3 (C), a mask 5 having holes formed according to the shape and position of the bus line electrode to be formed is positioned and arranged above the front glass substrate 1,
Expose the bus line electrodes. Then, as shown in FIG. 3D, a developing process is performed, and the resultant is baked at about 600 ° C. for about 3 hours to form a first layer of a bus line electrode having a thickness of 4 μm ± 1 μm.

Subsequently, a second layer of the bus line electrode is formed. As shown in FIG. 4A, a silver paste is applied, dried, exposed, developed, and baked under the same conditions to form a film having a thickness of 5.5 μm.
A bus line electrode 4 having a line width of ± 1.5 μm and a line width of 90 μm ± 10 μm is formed. In FIG. 4, the bus line electrode 4
Are not shown for each layer, but are shown integrally.

Then, as shown in FIG. 4B, a black stripe 6 is formed. The black stripe 6 is formed by first applying a paste having a viscosity of 10 to 45 Pa · s to the entire surface by a screen printing method,
A drying process is performed at a temperature of about 10 minutes. Exposure, development, baking for about 3 hours at about 600 ℃, film thickness 2.5μm ±
A 1.5 μm black stripe 6 is formed. FIG.
(C) shows the bus line electrode 4 and the black stripe 6
Is a plan view of the front glass substrate 1 formed in a stripe shape. In FIG. 4, the bus line electrode 4 and the black stripe 6 are separated from each other, but may be in contact with each other.

Subsequently, a dielectric layer is formed on the bus line electrodes 4 and the black stripes 6. The dielectric layer is 2
A layer is formed, and about 20 μm of one layer is formed by a screen printing method or a die coating method, and a film of about 40 μm is formed twice.

[0010]

As described above, in the process of manufacturing a surface plate of a color PDP, various projections such as electrodes and black stripes are formed by a screen printing method or a die coating method, and then a dielectric layer is formed thereon. Is formed. However, in forming this dielectric layer, FIG.
If the foreign matter 8 adheres to the surface as in (A), the foreign matter mixes in the coating liquid film and remains in the fired dielectric layer in the form of the foreign matter 8 or bubbles. In addition, as shown in FIG. 5B, if the paste has a high viscosity, the paste in the die head contains many fine bubbles 16 of 40 to 100 μm. The microbubbles 16 may remain in the paste-coated film and grow into giant bubbles after being dried and fired. When a panel is assembled with these foreign substances and bubbles contained therein, and a high voltage is applied, a spark is generated at that portion and the circuit may be destroyed.

An object of the present invention is to provide a method of manufacturing a high quality plasma display panel free of foreign matter and bubbles in a dielectric layer formed on a substrate of a plasma display, and to provide a plasma display panel manufactured in this step. And

[0012]

According to the present invention, there is provided a paste containing a polymer containing an organic polymer material and a low-melting glass composition. Is used to apply a thick film on a glass substrate.

[0013] Thereby, foreign matter in the coating liquid film is prevented from being mixed, and a higher quality film can be formed.

In the present invention, a paste containing an organic polymer material and a low-melting glass composition is vibrated at 20 to 100 kHz, and the vibrated paste is applied on a substrate by a die coating method.

[0015] Thus, the paste is broken and rapidly defoamed by ultrasonic vibration or generated compression waves.
Bubbles and voids in the paste are eliminated, and a higher quality film can be formed.

[0016]

FIG. 1 is a view showing a method of manufacturing a plasma display panel according to a first embodiment of the present invention, in which a bus line electrode 4 and a black stripe 6 formed on a front glass substrate 1 are formed. Next, a dielectric 7 layer is formed by the die head 11. The dielectric 7 layer is formed by screen printing or die coating of about 20 μm per layer, and forms a film of about 40 μm twice. This dielectric paste is a paste containing a low melting point lead glass, a resin component, a solvent, and the like, which is diluted with an organic solvent to a viscosity of 50 ± 5 Pa · s by a die coating method and a viscosity of 25 ± 10 Pa · s by a printing method. I do.
At this time, just before the paste is applied, the front glass substrate 1 is neutralized by the ions 13 or the plasma blow by the ionizer 12 as shown in FIG. As shown in the drawing, while the air is blown by the air 15, the paste of the dielectric 7 is applied while the substrate is cleaned to perform the exhaust process 14 in opposition to the blow. As a result, the immediately preceding foreign matter 8 can be effectively removed. Thereafter, the liquid film is dried at about 110 ° C. for 1 hour or more, and baked at about 600 ° C. for 3 hours to form a dielectric coating film. By this method, it was confirmed that no nonconformity occurred at all from the conventional nonconformity occurrence rate of 2% due to foreign matter. After forming this dielectric film, an MgO protective film is formed to complete the front panel.

When the front panel is manufactured as described above, the panel having the display portion completed by being bonded to the rear panel manufactured in another process and replacing the internal air with an inert gas has the following characteristics. I have confirmed that there is no problem at all.

Thereafter, an electronic circuit and a chassis are assembled to complete a color PDP.

FIG. 2 is a view showing a method of manufacturing a plasma display panel according to the first embodiment of the present invention, in which a dielectric is provided on bus line electrodes 4 and black stripes 6 formed on front glass substrate 1. Seven layers are formed. The dielectric 7 layers are formed by a screen printing method or a die coating method with a thickness of about 20 μm per layer, and a film of about 40 μm is formed twice.
This dielectric paste is a paste containing a low-melting lead glass, a resin component, a solvent, and the like.
First, the first layer is applied to about 90 μm at ± 5 Pa · s. At this time, since the paste has a high viscosity, the paste in the die head contains many fine bubbles of 40 to 100 μm. These microbubbles may remain in the film to which the paste is applied, and may grow into giant bubbles after being dried and fired. In order to remove these bubbles, before applying the dielectric paste, the tip of the die head is turned upward as shown in FIG.
By vibrating at kHz, the paste in the die head is vibrated, and bubbles 16 in the paste are removed by breaking or rapid defoaming.

At this time, if the vibration is applied for a long time by a higher frequency, the paste may generate heat and foam from a solvent component in the paste. Then, about 130 ° C, 30
After drying for about a minute, it is baked at about 40 μm, about 600 ° C. for 3 hours, and is reduced to about 20 μm. This step is performed again, and FIG.
(B) As shown in FIG.
7 μm dielectric layers are completed. For example, a transducer having an ultrasonic vibration frequency of 25 kHz was directly attached to a die coat nozzle to perform a transducer test for about 5 minutes. As a result, when the number of bubbles in the coating film was confirmed per unit area by this method, a remarkable effect of three bubbles was confirmed as compared with the conventional 10 bubbles. In this way, 5
The remarkable effect was confirmed that the dielectric breakdown voltage nonconformity rate of about 00 sheets manufactured was 2% to 0% in the past. After forming this dielectric film, an MgO protective film is formed to complete the front panel.

It has been confirmed that the above method is similarly effective in a method of forming a thick film using another high-viscosity paste material.

[0022]

As described above, according to the present invention, it is possible to prevent foreign substances from being mixed in the coating liquid film, eliminate bubbles and voids in the paste, and form a film of higher quality.

By forming a dielectric layer free of foreign matter and air bubbles, an advantageous effect is obtained in that quality problems due to dielectric breakdown, coating film quality inconsistency, and the like are less likely to occur.

[Brief description of the drawings]

FIG. 1 is a diagram showing a method for manufacturing a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a method of manufacturing a plasma display panel according to a second embodiment of the present invention.

FIG. 3 is a schematic view illustrating a procedure for forming a bus line electrode.

FIG. 4 is a schematic diagram illustrating a procedure for forming a bus line electrode and a black stripe.

FIG. 5 is a schematic view for explaining foreign matter and air bubbles mixed into a dielectric by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front glass substrate 7 Dielectric 8 Foreign material 11 Die head 12 Ionizer 15 Air 16 Bubbles

Claims (4)

[Claims] 1. A step of removing electricity from a substrate, a step of blowing a gas on the substrate to clean the substrate, and applying a thick film on a glass substrate using a paste containing an organic polymer material and a low-melting glass composition. And a method for manufacturing a plasma display. 2. A method comprising: vibrating a paste containing an organic polymer material and a low-melting glass composition at 20 to 100 kHz; and applying the vibrated paste onto a substrate by a die coating method. Manufacturing method of a plasma display. 3. A charge removing device for removing electricity from a substrate, a cleaning device for spraying a gas to a portion where the charge is removed, and a device for applying a paste containing an organic polymer material and a low-melting glass composition to the substrate. Characteristic plasma display manufacturing equipment. 4. A plasma display comprising: means for vibrating a paste containing an organic polymer material and a low-melting glass composition at 20 to 100 kHz; and means for applying the vibrated paste to a substrate. manufacturing device.