KR100523515B1 - Method of forming dielectric on the upper substrate of the plasma display panel - Google Patents

Abstract

The present invention relates to a method of forming a dielectric on an upper substrate of a plasma display panel, wherein a plurality of sustain electrodes are formed on a glass substrate, and bus electrode lines are respectively formed on the plurality of sustain electrodes. Forming; Surrounding the plurality of sustain electrodes and bus electrode lines, and forming a bubble generation prevention layer formed of a green sheet by primary casting on the glass substrate; It is configured to include a step of forming a sheet strength maintenance layer made of a green sheet by the secondary casting on the bubble generation prevention layer.

 Therefore, according to the present invention, by laminating with a multi-casting apparatus to form a dielectric green sheet of the composite layer and then firing, it is possible to prevent the generation of bubbles in the region where the electrode and the dielectric contact, and to simplify the process Occurs.

Description

Method of forming dielectric on the upper substrate of the plasma display panel

The present invention relates to a method of forming a dielectric on an upper substrate of a plasma display panel. More particularly, the present invention relates to a method of forming a dielectric green sheet of a composite layer by laminating with a multi-casting apparatus, and then firing it to a region in which an electrode and a dielectric are in contact with each other. The present invention relates to a method of forming a dielectric on an upper substrate of a plasma display panel capable of preventing the generation of bubbles.

In general, a plasma display panel is a surface discharge device capable of realizing a full color matrix using phosphors, and a sustain electrode and an address electrode are formed in a matrix form between an upper substrate and a lower substrate. Ultraviolet rays generated by He-Ne and Ne-Xe gas plasma light emission in discharge cells isolated by barrier ribs, which stimulate the phosphors, and are caused by the energy difference when the phosphors return from the excited state to the ground state. It is possible to implement an image by emitting light.

The plasma display panel manufactures an upper substrate and a lower substrate, respectively, and the packaging is completed.

The conventional method of manufacturing a dielectric on an upper substrate is manufactured through a printing process by five or more screen printing methods of FIG. 1 and then a drying process and two or more firing processes, and thus has a long cycle time because of a large number of work steps.

In addition, the final quality also remains in the mesh mask of the screen mask generated during the screen printing process, even after firing, thereby lowering the surface roughness.

In addition, since the printing and drying processes are repeated several times, the thickness of the dielectric film has a disadvantage that the uniformity is not good.

In order to solve this problem, a dielectric green sheet called green sheet or green tape has recently been manufactured using a tape casting device.

1 is a cross-sectional view of a dielectric formed on an upper substrate of a plasma display panel according to the prior art, comprising: a glass substrate 10; Sustain electrodes (11, 12, 13, 14) formed of a plurality of ITO films formed on the glass substrate (10); Bus electrode lines 21, 22, 23, 24, 25, 26, 27, and 28 formed on the plurality of sustain electrodes 11, 12, 13, and 14, respectively; A dielectric green formed on the glass substrate 10, surrounding the plurality of sustain electrodes 11, 12, 13, and 14 and the bus electrode lines 21, 22, 23, 24, 25, 26, 27, and 28. It consists of the sheet | seat 30.

Therefore, the dielectric green sheet 30 is laminated on the sustain electrode and the bus electrode line of the glass substrate 10 and then fired to have excellent characteristics of surface roughness of 500 kV or less, withstand voltage characteristic of 5 KV or more and thickness uniformity of ± 1 μm. An upper substrate dielectric having is fabricated.

In addition, the green sheet has the advantage of reducing the manufacturing cost by reducing the cycle time in addition to the above-described improvement of the work process is very simple.

However, in manufacturing the upper substrate dielectric of the plasma display panel using the green sheet, green sheet strength of a predetermined value or more must be maintained to facilitate handling in the process of lining the green sheet on the upper substrate.

In this way, the lamination failure due to the stretching of the green sheet or the thickness failure of the dielectric after firing can be prevented.

However, there is an edge curl in which the electrode curls up during the exposure, etching and firing processes.

Therefore, even if the laminating conditions are changed, as shown in FIG. 2, there is a problem in that bubbles are generated in a portion where the upper substrate glass, the electrode and the dielectric meet.

Accordingly, the present invention has been made to solve the problems described above, by laminating with a multi-casting apparatus to form a dielectric green sheet of the composite layer and then fired, thereby preventing the generation of bubbles in the area where the electrode and the dielectric contact. It is an object of the present invention to provide a method for forming a dielectric on an upper substrate of a plasma display panel.

A preferred aspect for achieving the above object of the present invention is a method of forming a dielectric on an upper substrate of a plasma display panel,

Forming a plurality of sustain electrodes on a glass substrate, and forming bus electrode lines on the plurality of sustain electrodes, respectively;

Surrounding the plurality of sustain electrodes and bus electrode lines, and forming a bubble generation prevention layer formed of a green sheet by primary casting on the glass substrate;

A method of forming a dielectric on an upper substrate of a plasma display panel is provided, including forming a sheet strength maintenance layer formed of a green sheet by secondary casting on the bubble generation prevention layer.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a cross-sectional view of a dielectric formed on an upper substrate of a plasma display panel according to the present invention, including a glass substrate 100; Sustain electrodes (111, 112, 113, 114) formed of a plurality of ITO films formed on the glass substrate (100); Bus electrode lines 121, 122, 123, 124, 125, 126, 127, 128 formed on the plurality of sustain electrodes 111, 112, 113, and 114, respectively; An air bubble generation layer (130) surrounding the plurality of sustain electrodes (111, 112, 113, 114) and bus electrode lines (121, 122, 123, 124, 125, 126, 127, 128) and formed on the glass substrate (100); It is composed of a sheet strength maintenance layer 140 formed on the bubble generation prevention layer 130.

The bubble generation prevention layer 130 is formed by primary casting the green sheet, and the sheet strength maintaining layer 140 is formed by secondary casting the green sheet on the bubble generation prevention layer 130.

Here, the bubble generation layer 130, if the content of the binder (Binder) is '1', the content of the plasticizer is preferably to form a green sheet at a ratio of '1 ~ 0.5'.

When the sheet strength maintaining layer 140 has a binder content of '1', the plasticizer content is preferably in a ratio of '0.5 to 0.1' to form a green sheet, and softly manufactured, thereby laminating the green sheet. Make sure the green sheet is well filled in the edge curl of the electrode.

At this time, it is preferable that the green sheet of the sheet strength maintaining layer 140 includes an additive such as a tackifier in order to improve adhesion to the glass substrate.

FIG. 4 is a view illustrating a process of forming a dielectric film on an upper substrate of a plasma display panel in a multi-tape casting apparatus, wherein first and second rollers 210 and 211 are formed on one side and the other side of the support part 200. have.

First and second casting dies 310 and 311 containing slurry are positioned on the support 200 to cast a green sheet.

When the glass substrate 100 on which the sustain electrodes and the bus electrodes are formed is placed on the support part 200 configured as described above, the glass substrate 100 is sequentially formed in the first and second casting dies 310 and 311. At the top, the green sheet will be cast.

The first casting die 310 first casts the slurry onto the glass substrate 100 to form the bubble generation prevention layer 130.

In addition, the second casting die 311 second-casts the slurry to the upper portion of the bubble generation prevention layer 130 to form a sheet strength maintenance layer 130 on the bubble generation prevention layer 130.

When the green sheet laminated in this manner is fired, formation of the dielectric film on the upper substrate of the plasma display panel is completed.

FIG. 5 is a cross-sectional photograph illustrating a state in which a dielectric is formed on an upper substrate of a plasma display panel according to the present invention, and bubbles are not generated between the dielectric, the electrode, and the glass layer.

As described above, the formation of the dielectric on the upper substrate of the plasma display panel of the present invention can be simplified by not using the screen printing method, and there is an advantage that bubbles are not generated at the interface between the green sheet and the electrode.

As described in detail above, the present invention can laminate the multi-casting apparatus to form a dielectric green sheet of a composite layer and then fire it, thereby preventing the generation of bubbles in the region where the electrode and the dielectric are in contact, and simplifying the process. That effect occurs.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

1 is a cross-sectional view of a dielectric formed on an upper substrate of a plasma display panel according to the related art.

2 is a cross-sectional photograph taken at 20 magnification of a state in which a dielectric is formed on an upper substrate of a plasma display panel according to the related art.

3 is a cross-sectional view of a dielectric formed on an upper substrate of a plasma display panel according to the present invention.

4 is a diagram illustrating a process of forming a dielectric film on an upper substrate of a plasma display panel in a multi-tape casting apparatus according to the present invention.

FIG. 5 is a cross-sectional photograph photographing a state in which a dielectric is formed on an upper substrate of a plasma display panel at a magnification of 20 according to the present invention.

<Description of the symbols for the main parts of the drawings>

10,100: Glass substrate

11,12,13,14,111,112,113,114: Sustain electrode

21,22,23,24,25,26,27,28,121,122,123,124,125,126,127,128 Bus electrode line

130: bubble generation prevention layer 140: sheet strength maintenance layer

210,211: Roller 310,311: Casting die

Claims (4)

In the method of forming a dielectric on the upper substrate of the plasma display panel, Forming a plurality of sustain electrodes on a glass substrate, surrounding bus electrode lines on the plurality of sustain electrodes, respectively; Wrapping the plurality of sustain electrodes and bus electrode lines, and including a binder and a plasticizer, if the binder content is '1', the slurry having a composition satisfying the content ratio of the plasticizer content is '1 ~ 0.5' Casting on the glass substrate to form a bubble generation prevention layer; Including a binder and a plasticizer, if the content of the binder is '1', a slurry having a composition satisfying the content ratio of the plasticizer is '0.5 ~ 0.1' is cast on top of the bubble generation layer to form a sheet strength maintenance layer And forming a dielectric on the upper substrate of the plasma display panel. delete delete The method of claim 1, The sheet strength maintaining layer comprises a glass substrate and a tackifier (Tackifier) that is an additive for improving the adhesion to form a dielectric on the upper substrate of the plasma display panel.