KR20040066275A - Method of forming dielectric on the upper substrate of the plasma display panel - Google Patents

Abstract

PURPOSE: A method is provided to achieve improved transmissivity and prevent crack of MgO layer by laminating a dielectric green sheet through the use of a multi-casting device and baking the sheet. CONSTITUTION: A method comprises a first step of forming a plurality of sustain electrodes on a glass substrate, and forming bus electrode lines on the sustain electrodes; a second step of forming an electrode discoloration preventing layer formed of green sheets on the glass substrate through a primary casting process in such a manner that the electrode discoloration preventing layer covers the sustain electrodes and the bus electrode lines; and a third step of forming a transmissivity improvement layer formed of green sheets on an air bubble preventing layer through a secondary casting process.

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, thereby improving dissipation characteristics without electrode discoloration. The present invention relates to a method of forming a dielectric on an upper substrate of a plasma display panel that can prevent cracks in an MgO layer.

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 a cycle time is very long because there are many working processes.

In addition, the final quality of the mesh mask of the screen mask generated during the screen printing process remains as it is after firing, so that the surface roughness is lowered.

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, this single layer green sheet has a problem of discoloring the sustain electrode and the bus electrode line, lowering the transmittance, and causing cracks in the MgO layer formed on the green sheet.

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, there is no electrode discoloration, improve the transmittance characteristics, and the MgO layer of An object of the present invention is to provide a method of forming a dielectric on an upper substrate of a plasma display panel that can prevent cracks from occurring.

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;

A second step of surrounding the plurality of sustain electrodes and the bus electrode lines and forming an electrode discoloration prevention layer made of a green sheet on the glass substrate by primary casting;

A method of forming a dielectric on an upper substrate of a plasma display panel is provided, comprising a third step of forming a transmittance improving layer made of a green sheet by secondary casting on the bubble generation prevention layer.

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 view of a dielectric formed on an upper substrate of a plasma display panel according to the present invention.

3 illustrates 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.

<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: electrode discoloration prevention layer 140: transmittance enhancement layer

150: MgO crack prevention layer 210211: roller

310,311,312: casting dies

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

2 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 electrode discoloration prevention layer 130 surrounding the plurality of sustain electrodes 111, 112, 113, and 114 and the bus electrode lines 121, 122, 123, 124, 125, 126, 127, and 128 and formed on the glass substrate 100; A transmittance improvement layer 140 formed on the electrode discoloration preventing layer 130; The MgO crack prevention layer 150 is formed on the transmittance improving layer 140.

Here, the electrode discoloration prevention layer 130 is formed by primary casting the green sheet, the transmittance enhancement layer 140 is formed by secondary casting the green sheet on the electrode discoloration prevention layer 130, the present invention Is a basic feature.

Further, the method may further include forming the MgO crack prevention layer 150 by tertiary casting the green sheet on the transmittance improving layer 140.

The electrode discoloration prevention layer 130 is a slurry that combines the electrode discoloration prevention powder with an organic binder, that is, YAI-YF-065F manufactured by Asai, and the transmittance enhancement layer 140 is a slurry in which a powder for improving the transmittance is combined with an organic binder. In other words, Asai YFT-340 is used.

When the MgO film is formed on the transmittance improving layer 140, the MgO crack preventing layer 150 made of the green sheet of the same material as the electrode discoloration preventing layer 130 may be prevented to prevent cracking of the MgO film. Is formed on the transmittance improving layer 140.

3 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 according to the present invention, wherein first and second rollers 210 and 211 are formed on one side and the other side of the support part 200. have.

First to third casting dies 310, 311 and 312 in which a slurry is contained, for casting the green sheet, are positioned on the support 200.

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 to third casting dies 310, 311 and 312. At the top, the green sheet will be cast.

The first casting die 310 first casts a slurry onto the glass substrate 100 to form an electrode discoloration preventing layer 130, and the second casting die 311 forms a slurry to the electrode discoloration preventing layer 130. The secondary casting to the upper portion of the) to form a transmittance improvement layer 140 on the electrode discoloration prevention layer 130.

Here, the third casting die 312 is third-cast the slurry to the upper portion of the transmittance improvement layer 140 to form an MgO crack prevention layer 150 on the upper portion of the transmittance improvement layer 140.

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.

Table 1 shows the experimental results of the dielectric formed on the upper substrate of the plasma display panel according to the present invention. The green sheets using the single layer had low transmittance, discoloration occurred, and cracks occurred in the MgO layer. As compared with the prior art, the dielectric layer in which the electrode discoloration prevention layer and the transmittance improving layer were formed has improved transmittance, no discoloration, and no crack in the MgO layer.

number Dielectric layer Transmittance discoloration MgO Crack One 1st floor (AFT YFT-065F) 74% radish radish 2 1st floor (AFT YFT-094) - versus U 3 1st floor (AFT YFT-340) - medium radish 4 2-layer (Asai YFT-065F / YFT-340) 78% radish radish 5 3-layer (Asai YFT-065F / YFT-094 / YFT-065F) 79% radish radish

In addition, the present invention has the advantage that the manufacturing process can be reduced by reducing the manufacturing cycle time in addition to the above characteristics improvement work process is very simple.

As described in detail above, the present invention is laminated by a multi-casting apparatus to form a dielectric green sheet of a composite layer and then fired, thereby eliminating electrode discoloration, improving transmittance characteristics, and preventing occurrence of cracks in the MgO layer. That effect occurs.

Although the present 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 present invention, and such modifications and modifications belong to the appended claims.

Claims (2)

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 and forming bus electrode lines on the plurality of sustain electrodes, respectively; A second step of surrounding the plurality of sustain electrodes and the bus electrode lines and forming an electrode discoloration prevention layer made of a green sheet on the glass substrate by primary casting; And a third step of forming a transmittance improving layer made of a green sheet formed by secondary casting on the bubble generation prevention layer. The method of claim 1, And after the third step, forming a MgO crack prevention layer made of a green sheet by secondary casting on top of the transmittance improving layer.