KR19990004793A - Electrode Formation Method of Plasma Display Device - Google Patents

Abstract

The present invention discloses a novel method capable of forming an electrode having a U-shaped cross section by a thick film method.

In the present invention, the electrode paste containing a large amount of the photosensitive material or the organic binder is printed on the whole surface of the partition wall to give a difference in degradability by exposure or local heating, and the residual layer is heated to remove the photosensitive material, thereby forming a U-type by the thick film method. The electrode of the cross section was formed.

Description

Electrode Formation Method of Plasma Display Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of plasma display panels (PDPs), and more particularly to a method of forming the electrodes.

As shown in FIG. 1, the PDP using the gas discharge phenomenon for image display has the electrodes E1 and E2 intersectingly arranged on two substrates P1 and P2 filled with discharge gas therebetween, Basically, the pixels are divided into partitions B.

Plasma discharge generated in the discharge space between the partition walls (B) excites the fluorescent layer (F) to generate visible light, as shown in the structure formed on the front substrate (P1) side of the fluorescent layer (F) The structure formed on the transmissive and back substrate P2 side is a reflective PDP.

Most reflective PDPs and some transmissive PDPs have a reflective layer R for concentrating the generated visible light onto the front substrate P1. The reflective layer R is generally composed of a white layer including a white pigment. As a result, the reflection efficiency is not very high.

Accordingly, the rear electrode E2 composed of metal electrodes is formed by a thin film method in a U-shape across both partitions B so that the front electrode can emit light and also act as a reflective layer. Attempts have been made as in FIG.

However, in this case, the deposited metal layer (E ') is formed on the top of the partition wall (B), so that the insulation between the electrodes of adjacent pixels is not possible, and the process cost of the thin film process such as deposition is ten times higher than the thick film process such as printing. There is a very uneconomical problem because of the high price.

Accordingly, an object of the present invention is to provide a method capable of forming an electrode having a U-shaped cross section by a thick film process.

1 is a cross-sectional view showing the configuration of a transmissive PDP;

2 is a cross-sectional view showing a problem of the conventional electrode forming method,

3 (A)-(E) are sequential cross-sectional views illustrating the method of the present invention,

4A to 4E are sequential cross-sectional views illustrating another method of the present invention.

Explanation of symbols for main parts of the drawings

P1, P2: (front and back) substrate

E1, E2: (front and back) electrodes

B: bulkhead

T: electrode paste

T ': residual layer

The first method of the present invention to achieve the above object is to print the electrode paste (positive) including the positive photosensitive material on the front surface (full surface) on the partition wall, the back substrate with the electrode paste partially dried The electrode paste is exposed to light, and developed, and the remaining layer is heated and calcined.

On the other hand, the second method of the present invention is printed between the partition walls with an electrode paste containing a thermally decomposable organic binder, the electrode paste is dried by local heating from the back side of the back substrate, washed and remaining The layer is heated to pyrolyze the binder.

The two methods of the present invention have a common thermal decomposition polymer base such as a photosensitive material or an organic binder, respectively, bar volume of the electrode layer is greatly reduced by the thermal decomposition of such a base of the U-shaped cross section To form an electrode.

EXAMPLE

Specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the attached drawings.

3 is a method of using an electrode paste (T) containing a positive photosensitive material, the photosensitive material is actually a polymer such as PVA (Poly Vinyl Alcohol) by a photosensitive component such as ADC (Ammonium Di Chloride) Since it uses the property of changing the binding property of the material, it can be said that it contains a high molecular organic material in the name, PVA and the like included a small amount as a binder for the formation of a coating film when applying the functional layer It is an organic binder.

In the case of a general electrode paste, a solid component contains about 10% of a solvent, about 10%, and according to the present invention, about 30% or more of the photosensitive material is included, so that the solid component is included in the total weight by weight. It is preferable that it is 40% or more of the paste T.

As such, when a large amount of solid components is included, it becomes difficult to print, but in the case of the present invention, since the front printing is performed, there will be no problem.

First, as shown in FIG. 3 (A), the electrode paste T including the photosensitive material on the partition B is coated on the front surface by printing, and dried.

Here, if the coating film is completely dried, there is no difference in degradability due to exposure, so that after partial drying is performed to some extent, front exposure is performed on the rear surface of the back substrate P2 as shown in FIG. Then, the part except the dotted line part on the partition B covered by the partition B is exposed, and a difference arises in degradability.

Next, when this is developed by spraying the washing water, a portion of the upper part of the partition wall B is removed to form a residual layer T ′ only between the partition walls B as shown in FIG. 3C.

Then, the substrate P2 is introduced into a heat treatment furnace to heat the residual layer T 'as shown in FIG. 3D. Since the photosensitive material in the residual layer T' is an organic substance such as PVA, It is pyrolyzed and released as gas.

Since the content of the photosensitive material is much higher than that of other solid components, the volume of the residual layer T is greatly reduced by sintering, and thus, the electrode E2 having a U-shaped cross section over both partitions B as shown in FIG. ) Is completed.

Meanwhile, the method of FIG. 4 is a method of using a thermally decomposable organic binder, but this method also uses a polymer material such as PVA. However, the method of FIG. 3 differs from the method of FIG. 3 in that a photosensitive component such as an ADC is not included.

In Fig. 4A, preferably, the electrode paste T contains 30% or more of a polymer organic binder such as PVA in a weight ratio and is printed between the partition walls B. Here, the printing method is also front printing.

Next, in Fig. 4 (B), when localized heating is performed by contacting a heater (H) on the back surface of the back substrate P2, the heat is conducted along the substrate P2 and the partition wall B. The electrode paste T is cured.

Here, the polymer binder such as PVA is cured by the polymer arms being bonded to each other by heating. Since the heating is performed from the back surface of the substrate P2, the active material is more active at the dotted line adjacent to the partition B and the back substrate P2. The combination is made.

That is, since the degree of bonding is different, the remaining layer T 'remains only at a portion adjacent to the partition B and the substrate P2 as shown in FIG.

Then, as shown in FIG. 4 (D), the organic binder in the residual layer T ′ is removed to obtain the electrode E2 having a U-shaped cross section as shown in FIG. 4E.

As described above, in the present invention, the degree of bonding of the organic polymer material becomes different due to exposure or heating, and when heated to a high temperature, an electrode having a U-shaped cross section is formed using only a thick film method using a property of thermal decomposition.

Accordingly, the present invention is very effective in implementing a high-brightness PDP at a low manufacturing cost.

Claims (5)

In the method for forming an electrode between the partition wall of the back substrate of the plasma display device, After the electrode paste containing a positive photosensitive material is printed on the partition wall, Developing by exposing to the entire surface from the back surface of the back substrate, Pyrolysing and removing the photosensitive material by heating the remaining layer An electrode forming method of a plasma display device. The method of claim 1, 30% or more of the photosensitive material is included in the electrode paste by weight. An electrode forming method of a plasma display device. The method of claim 1, The front exposure is achieved in the partially dried state of the printed electrode paste. An electrode forming method of a plasma display device. In the method for forming an electrode between the partition wall of the back substrate of the plasma display device, An electrode paste including a thermally decomposable organic binder is printed on the partition wall in full, Locally heated from the back of the back substrate, dried and washed, Pyrolysis and removal of the organic binder by heating the remaining layer An electrode forming method of a plasma display device. The method of claim 4, wherein The organic binder is contained in the electrode paste 30% or more by weight An electrode forming method of a plasma display device.