KR100340065B1 - Method for forming barrier rib of plasma display panel by using comb - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a partition of a plasma display panel which is simpler in manufacturing, has a low manufacturing cost, and does not cause environmental pollution. After the glass paste is completely coated, the partition is scraped by physical force in a dry state. There is a characteristic.

Description

Method for forming partition wall of plasma display panel using comb {METHOD FOR FORMING BARRIER RIB OF PLASMA DISPLAY PANEL BY USING COMB}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel, and more particularly, to a method for forming partition walls of a plasma display panel.

Plasma display panels (hereinafter referred to as PDPs) are devices that display characters or graphics using light emitted from plasma generated during gas discharge. PDP has the advantage of being most suitable for large-scaled display among various flat panel display devices such as liquid crystal display (LCD), field emission display (FED), and electroluminescence display (ELD) which are being actively studied.

That is, the plasma display panel can be enlarged to 40 'or larger, and CRT level colorization is possible because the ultraviolet light generated by the discharge uses a photoluminescence mechanism that emits visible light by stimulating the fluorescent film. As a self emissive display, it has many unique advantages not found in other flat panel devices such as a wide viewing angle of 160 ° or more. As a result, the next generation high-definition wall-mounted TV, a large display device for multimedia, in which the functions of the TV and the PC are combined, is considered to be prominent.

PDP uses two glass substrates with a thickness of 3 mm to apply an appropriate electrode and phosphor on each substrate, and forms plasma in the space therebetween while maintaining the distance between the two substrates at about 0.1 mm to 0.2 mm. Since the method is adopted, the size of the flat plate can be increased.

In addition, in the PDP, the gas discharge has a strong non-linearity in which discharge does not occur even when a voltage is applied between electrodes, and a super large panel having a memory function that is essential for driving a large display. Even in this case, a high quality image can be expressed without deteriorating the luminance.

Plasma display panels have a direct current (DC type) in which the electrode for generating plasma is directly exposed to the plasma so that conduction current flows directly through the electrode, and the electrode is covered with a dielectric and is not directly exposed. ) Is divided into the alternating current type (AC type).

A pair of parallel transparent electrodes, a bus electrode formed on the transparent electrode, a dielectric layer, and the like are formed on the front plate of the AC PDP. The back plate is formed with an address electrode perpendicular to the bus electrode, a dielectric layer, a partition formed on the dielectric layer, and a fluorescent layer formed between the partition walls. The front and back plates of such a structure are sealed and exhausted to form a PDP.

In the manufacture of PDPs there are common process technologies such as screen printing, photolithography and special processes for the formation of barrier ribs. Among them, a screen print method, a sand blast method, a method using a photosensitive paste, and a press method have the following characteristics.

Thick film forming technology by screen printing is one of the most used processes for PDP production because of its simple production facilities and high material utilization efficiency. The principle of screen printing is a method of printing a desired shape on a substrate by holding a patterned screen at a predetermined interval, placing it on a substrate, and pressing and transferring a paste necessary for forming a partition wall.

1 is a cross-sectional view for explaining a screen printing method, using a glass paste (not shown) using a squeeze (not shown) in an emulsion screen mask M1 having a hole corresponding to a partition wall. In the method of pushing 12), the state where the partition 13 was formed by laminating | stacking paste on the glass substrate 11 until it reaches a desired height is shown. The partition 13 is formed on the glass substrate 11 on which address electrodes (not shown) and dielectric layers (not shown) are formed.

Such a screen printing method has the advantages of a simple process, a cheap material, and a low waste, but a height of about 20 μm can be obtained before a predetermined time in a single printing. Therefore, in order to obtain a partition of 50 µm to 100 µm, a plurality of drying processes are carried out by performing overlapping printing 5 to 10 times. Therefore, the uniformity of the height is small and the width of the partition wall is narrowed upward so that it does not completely isolate between adjacent cells, causing mis-discharge and applying a large pressure to the dielectric of the front plate and the MgO film.

Sandblasting is a method of forming a partition by applying a partition material widely on a substrate and then partially removing the partition material. The method of sandblasting is widely used for forming a high-definition partition in a large panel manufacturing process. Proceed.

First, as shown in FIG. 2A, a glass paste 22, which is a partition material, is formed on a glass substrate 21 on which an address electrode (not shown), a dielectric layer (not shown), and the like are formed, and then the glass paste 22 is formed. After the photosensitive dry film 23 is coated on), it is exposed using photomask M2 in which a partition pattern is defined. Reference numeral 24 denotes a photosensitive film remaining on the partition area.

Subsequently, the development process is performed to leave the photosensitive dry film 24 only in the region where the partition wall is to be formed as shown in Fig. 2B. In Fig. 2B, reference numeral 22A denotes a glass paste portion forming a partition.

Then, the abrasive is sprayed to physically remove the unprotected portion of the photosensitive dry film 24 to form a partition wall. At this time, the abrasive used is Al ₂ O ₃ , SiC, glass fine particles, etc., and compressed air or nitrogen gas. Sprayed by. In the sand blasting method, it is possible to form a partition having a thickness of 70 µm or less on a large-area substrate, to obtain a desired partition shape, pitch, and the like, and is widely used.

However, physical impacts on the substrate glass may cause cracking of the substrate during firing, complicated processes, high capital investment, high production costs due to the consumption of many materials, and the possibility of pollution due to dust. Have

The method using the photosensitive paste proceeds according to the process sequence of FIGS. 3A and 3B.

First, as shown in FIG. 3A, a photosensitive glass paste 32, which is a partition material, is formed on a glass substrate 31 on which an address electrode (not shown), a dielectric layer (not shown), and the like are formed, and a partition pattern The photosensitive glass paste 32 is exposed using this defined photo mask M3.

Subsequently, the photosensitive glass paste 32 is developed to form a partition 33 as shown in FIG. 3B.

The photosensitive paste method has the same advantages in terms of quality as the sandblasting method and is simpler in terms of process. However, the photosensitive paste is expensive and wasteful of materials, and it is difficult to photosensitize 200 μm thick materials. .

4A and 4B, the principle of partition wall formation using a press recently proposed will be described.

4A shows a glass paste 42, which is a partition material, is formed on a glass substrate 41 on which an address electrode (not shown), a dielectric layer (not shown), and the like have been formed, and the partition wall is engraved with a press 43. FIG. It is holding down. Reference numeral 's' denotes the surface of the glass paste 42 layer before pressing by a press.

Subsequently, by removing the press 43, the glass paste 42 may remain only in the partition wall region as shown in FIG. 4B.

The method of forming a partition wall using the press as described above is a preferred method in all aspects, such as the quality of the partition, the manufacturing cost, the efficiency of the material, the processing time, and the stability to environmental pollution, but there are many unsolved technologies. .

Therefore, there is a need for a barrier rib formation technique capable of solving the disadvantages of screen printing, sand blasting, photosensitive paste, pressing, and the like.

Disclosure of Invention The present invention devised to solve the above problems is to provide a method of forming a pattern of a plasma display panel with a simpler process, a low manufacturing cost, and no environmental pollution problem.

1 is a cross-sectional view for explaining a screen printing method,

2A and 2B are cross-sectional views for explaining the sandblasting method;

3A and 3B are cross-sectional views for explaining the photosensitive paste method;

4A and 4B are cross-sectional views for explaining the pressing method;

5A is a perspective view illustrating a process of forming a partition wall of a plasma display panel using a comb according to the present invention;

5B and 5C are cross-sectional views each illustrating the comb teeth of the comb shown in FIG. 5A;

6A to 6E are cross-sectional views of a barrier rib forming process of a plasma display panel according to a first embodiment of the present invention;

7 is a cross-sectional view of a barrier rib forming process of a plasma display panel according to a second embodiment of the present invention;

8A to 8E are cross-sectional views of a barrier rib forming process of a plasma display panel according to a third embodiment of the present invention.

* Description of reference numerals for the main parts of the drawings *

52, 82, 83, 84: glass paste layer 53: partition wall

60: Comb A: First Comb

B: second comb C: third comb

In order to achieve the above object, the present invention provides a pattern forming method of a plasma display panel, comprising three rows of combs, each comb of each row having a different width, and comb teeth in the advancing direction of the comb perpendicular to the row. The first step of providing a comb to sequentially decrease the size of the width; Forming a glass paste layer on the substrate; Selectively scraping off the glass paste layer using the comb to leave the glass paste layer on a pattern forming region; And a fourth step of forming a pattern by baking the remaining glass paste layer.

In addition, the present invention for achieving the above object consists of three rows of comb teeth, the comb teeth of each row has a different width, the size of the comb width in the progress direction of the comb perpendicular to the row is sequentially reduced A first step of preparing a comb; A second step of forming a glass paste layer and a photosensitive dry film on the substrate; Selectively scraping the photosensitive dry film and the glass paste layer using the comb to leave the photosensitive dry film and the glass paste layer on a pattern forming region; And firing the remaining photosensitive dry film and the glass paste layer to form a pattern.

Preferably, the largest width of the comb teeth is equal to the spacing between neighboring patterns.

The present invention is characterized in that after the entire surface of the glass paste is applied, the partition wall is scraped off by physical force in a dry state. The paste is composed of fine particles of several micrometers in size in an organic solvent, and when dried, there is no great difficulty in forming a pattern having an aspect ratio of about 80 μm in width and about 200 to μm in height. In addition, the dry paste is easily broken, so that no physical force is transferred to the surroundings, which reduces the risk of breakage of the bulkhead during the process.

For example, it has been experimentally confirmed that a glass paste used as a dielectric layer (white back) of a back plate may be dried and then patterned with a razor blade at a thickness of 30 μm to form a pattern having a width of about 90 μm.

Hereinafter, a method of forming a partition wall of a plasma display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5A is a process perspective view illustrating a process of forming a partition wall of a plasma display panel using a comb according to the present invention, wherein an address electrode (not shown), a dielectric layer (not shown), and the like are formed on a glass substrate 50 The photosensitive glass paste 52 which is a partition material is formed in this, and the partition 53 is formed using the comb 60 which has three types of comb teeth.

5B and 5C are enlarged cross-sectional views a and b of the comb 60 shown in FIG. 5A, respectively, in which the first row of the first comb A and the second row and the third of the second comb B are shown. Composed of the third row of the comb teeth (C), and shows the structure of the comb 60 in which the size of the comb teeth sequentially increases from the first row to the third row. The spacing between the first comb A is narrower than the spacing between the second comb B, the spacing between the second comb B is narrower than the spacing between the third comb C and the spacing between the third comb C It is the same interval as the space between partitions.

A method of forming a partition wall of a plasma display panel using a comb of the aforementioned structure will be described in detail with reference to the accompanying drawings.

First, a method of forming a partition wall of a plasma display panel according to a first embodiment of the present invention will be described with reference to FIGS. 6A to 6E.

As shown in FIG. 6A, a glass paste, which is a partition material, is formed on a glass substrate 51 on which an address electrode (not shown), a dielectric layer (not shown), and the like are formed, dried, and a glass having a thickness of about 200 μm. The paste 52 layer is formed. Reference numeral 53 denotes a partition portion to be completed.

Next, when combing is started in a state in which the first comb A having the smallest comb size is facing the front in the advancing direction, as shown in FIGS. 6B, 6C, and 6D, the glass paste of the portion not remaining as a partition wall ( 52) The first comb (A), the second comb (B), and the third comb (C) are scraped off in sequence.

In this process, the first comb (A) digs a narrow groove where it is to be removed, and the second comb (B) digs most of the place where it is to be removed, and the width equal to the distance between neighboring bulkheads. When the third comb teeth C have passed, only the glass paste layer which forms the partition wall remains.

On the other hand, irregularities may be formed in the second comb B to prevent the force from being transmitted to the glass paste layer 53 remaining after the second comb B passes.

As described above, when the glass paste powder generated during combing using the comb is blown off and then removed, the firing process is performed to form a partition 53 pattern as illustrated in FIG. 6E.

FIG. 7 is a cross-sectional view of a barrier rib forming process of a plasma display panel according to a second exemplary embodiment of the present invention, wherein a barrier material is formed on a glass substrate 71 on which address electrodes (not shown), dielectric layers (not shown), etc. have been formed. The in-glass paste is formed, dried to form a glass paste layer 72 having a thickness of about 200 μm, and the photosensitive dry film 73 is formed on the glass paste layer 72 to remain as a partition.

After the process as shown in FIG. 7, combing is performed as shown in FIGS. 6B to 6E to form a partition wall pattern, and a firing process is performed.

Like the first and second embodiments of the present invention described above, the partition walls may be formed in multiple layers without forming them at once.

8A to 8E, a method of forming a partition wall of a plasma display panel according to a third embodiment of the present invention will be described.

First, as shown in FIG. 8A, the glass paste, which is a partition material, is printed on the glass substrate 81 on which the address electrode (not shown), the dielectric layer (not shown), etc. are completed, and the first glass is dried. The paste layer 82 is formed, and the combing and plasticity processes as shown in Figs. 6B to 6E are carried out to leave the first glass paste layer 82 in the partition region as shown in Fig. 8B, The second glass paste layer 83 is completely printed and dried.

Next, a combing and plasticity process as shown in Figs. 6B to 6E is performed to leave the second glass paste layer 83 on the first glass paste layer 82 as shown in Fig. 8C.

Next, as shown in FIG. 8D, the glass paste layer is entirely printed on the glass substrate 81, dried to form a third glass paste layer 84, and combed as shown in FIGS. 6B to 6E. As shown in Fig. 8E, the third glass paste layer 84 is left on the second glass paste layer 83 to form a barrier rib having a multi-layered structure.

In the process of repeating the front printing, drying, combing, plasticizing process and the like as in the third embodiment of the present invention described above, plasticity is performed at a temperature at which glass deformation does not occur while having sufficient strength. For reference, in the case of line glass (lime glass) heat deformation of about several μm occurs per 1 m during the firing process at 450 ℃ temperature.

On the other hand, by mixing the resin in the glass paste in the first to third embodiments of the present invention to make it elastic even after drying it can significantly reduce the risk of breakage of the partition wall when combing.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

According to the present invention as described above, a partition of good quality can be formed as in the case of forming using a sandblasting method and a photosensitive paste using an inexpensive material as high as a pattern printing method. The scraped material can be recycled by simply mixing the evaporated emulsion in the drying process, so the efficiency is high and there is no problem of dust generation like the sandblast process. The process is as simple as the press method, and the process time is short, making it easy to apply to mass production. In addition, the comb used in the present invention is easy to manufacture and can be used semi-permanently is economical.

Claims (7)

In the pattern formation method of a plasma display panel, A first step of providing a comb comprising three rows of comb teeth, the comb teeth of each row having different widths, the comb width being sequentially reduced in the direction of the comb perpendicular to the row; Forming a glass paste layer on the substrate; Selectively scraping off the glass paste layer using the comb to leave the glass paste layer on a pattern forming region; And A fourth step of forming a pattern by firing the remaining glass paste layer Pattern forming method of the plasma display panel comprising a. In the pattern formation method of a plasma display panel, A first step of providing a comb comprising three rows of comb teeth, the comb teeth of each row having different widths, the comb width being sequentially reduced in the direction of the comb perpendicular to the row; A second step of forming a glass paste layer and a photosensitive dry film on the substrate; Selectively scraping the photosensitive dry film and the glass paste layer using the comb to leave the photosensitive dry film and the glass paste layer on a pattern forming region; And A fourth step of forming a pattern by baking the remaining photosensitive dry film and the glass paste layer Pattern forming method of the plasma display panel comprising a. The method according to claim 1 or 2, And the pattern is a partition wall. delete The method according to claim 1 or 2, And performing the second to fourth steps at least once. delete The method of claim 1, The largest width of the comb teeth is the same as the spacing between neighboring patterns pattern forming method of the plasma display panel.