JP2000340104A - Plasma display panel barrier rib forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a plasma display panel barrier rib forming method, reducing manhours and capable of obtaining barrier ribs having no cracks or the like causing useless lighting. SOLUTION: A barrier-rib material layer 3 is formed on a back glass substrate 1 equipped with address electrodes 2 at fixed intervals, then a die 5 corresponding to the shape of barrier ribs is held on the barrier-rib material layer 3, and baking is performed to form barrier ribs 4. This allows manhours to be reduced without the need to perform sandblast and to sticking and patterning a dry film serving as a mask in sandblasting, as was the case in the past.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method for forming a partition in a plasma display panel for displaying by utilizing gas discharge. A partition in a plasma display panel (hereinafter, referred to as a PDP) is a component for partitioning a discharge space into a grid shape or a band shape, and it is demanded that the size and shape accuracy be increased without requiring many man-hours.

[0002]

2. Description of the Related Art First, a basic structure of a PDP will be described by taking an AC-driven surface discharge type PDP as an example. FIG. 5 is an exploded perspective view of an AC-driven surface discharge type PDP. As shown in FIG. 5, the PDP 30 has a three-electrode structure in which a pair of display electrodes 34 composed of X and Y correspond to address electrodes 44 in a unit light emitting area EU of a matrix display.

A display electrode 34 composed of a pair of X and Y for surface discharge forming this display line is provided on the display surface H side with respect to the discharge space 45, that is, on the front glass substrate 31. A transparent electrode 3 made of a Nesa film, an ITO (Indium Tin Oxide) film, or the like to minimize light blocking.
2 and metal auxiliary electrode 3 for lowering resistance to compensate for its conductivity
3 are laminated.

On the display electrode 34, a dielectric layer 3 for AC driving for maintaining a gas discharge by utilizing wall charges is provided.
The insulating layer 5 covers the discharge space, and a protective film 36 made of MgO having a thickness of about several thousand is further provided on the surface of the dielectric layer 35. On the other hand, the address electrodes 44 for selectively emitting light in the unit light emitting region EU are arranged on the rear glass substrate 41 at a constant pitch so as to be orthogonal to the display electrodes 34 composed of the pair of X and Y. 100-150μ between electrodes 44
A stripe-shaped partition wall 42 having a height of about m is provided, whereby the discharge space 45 is partitioned into unit light emitting regions EU in the line direction (extending direction of the display electrode 34), and the interval between the discharge spaces 45 is reduced. Stipulated.

Further, the rear glass substrate 41 is coated with R (red), G (green), and B (red) so as to cover the inner surfaces on the rear surface including the upper surface of the address electrodes 44 and the side surfaces of the partition walls 42.
A phosphor 43 of three primary colors (blue) is provided. In the PDP 30 having such a configuration, the phosphors 43 of each color are excited by ultraviolet rays radiated from the gas discharge in the discharge space 45 at the time of surface discharge to emit light, and full color display by a combination of R, G, and B is possible. In the display, the partition 42 prevents crosstalk between the unit light emitting regions EU.

As described above, the PDP 30 is provided with predetermined components individually for the front glass substrate 31 and the rear glass substrate 41, and then, the front glass substrate 31 and the rear glass substrate 41 are arranged to face each other. It is manufactured by a series of steps in which the periphery of the gap is hermetically sealed, the inside is once evacuated, and a discharge gas is sealed. The present invention relates to the above PD
Among the structures of P, the present invention particularly relates to a method of forming a partition on the rear glass substrate side, and a conventional method of forming a partition will be described below.

FIG. 6 is a process sectional view for explaining a conventional method for forming a partition wall of a PDP, and the same parts as those in FIG. 5 are denoted by the same reference numerals. First, as shown in FIG.
A partition material layer 42A is formed in a predetermined area on the rear glass substrate 41 provided with the address electrodes 44 at predetermined intervals by using a printing technique such as screen printing.

Thereafter, as shown in FIG. 6B, a mask 47 having openings of a predetermined shape (partition pattern) is formed on the partition material layer 42A. The mask 47 is formed by patterning a photosensitive sheet called a dry film, for example. More specifically, after a dry film is attached to the entire surface of the partition wall material layer 42A, a portion having an opening is irradiated with light having a predetermined wavelength to be exposed to light and developed to obtain the mask 47.

Then, as shown by an arrow in FIG.
The surface of the partition wall material layer 42A is subjected to a process called sandblasting in which fine abrasive particles collide at high speed, and unnecessary portions of the partition wall material layer 42A exposed at the openings of the mask 47 are ground. The mask 47 has elasticity and is not ground by repelling fine abrasive grains by sandblasting. After the above-described sand blasting process is continued for a predetermined time, the mask 47 is removed by etching or the like, so that the partition wall 42 defining the discharge space is formed on the rear glass substrate 41 as shown in FIG. .

The structure of the partition wall material layer 42A is in a lower density state than the address electrodes 44 and the rear glass substrate 41, and is easily ground. That is, the address electrodes 44 and the back glass substrate 41 are not ground by the sandblasting process for forming the partition walls 42. Partition wall 42
Is finally made into a strong state by performing a baking treatment.

[0011]

According to the conventional method of forming a partition as described above, after the partition material layer 42A is printed,
A lot of man-hours were required for attaching and patterning the dry film, and further for sandblasting, and the control was troublesome. In addition, if there is a portion where the film thickness is large, cracks may occur due to stress during drying, and these cracks may cause deterioration of display characteristics such as unnecessary lighting due to discharge sparks.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a method of forming a partition wall of a plasma display panel which can reduce the number of steps and obtain a partition wall free from cracks or the like which cause unnecessary lighting. With the goal.

[0013]

A plasma display panel partition wall forming method according to the present invention is directed to a plasma display panel partition wall forming method in which a discharge space formed between a pair of substrates is partitioned by partition walls. A first step of applying the partition wall material, a second step of pressing the partition wall material with a mold corresponding to the partition wall shape after the partition wall material has a predetermined viscosity, and holding the mold on the partition wall material In this state, a third step of baking and a fourth step of separating the mold from the partition wall material are sequentially performed.

As described above, in the present invention, after the partition wall material is applied, baking is performed in a state in which the mold corresponding to the partition wall shape is held in the partition wall material, thereby forming the partition walls.
It is not necessary to apply and pattern a dry film serving as a mask at the time of sandblasting or sandblasting as in the related art, and the number of steps can be reduced. In addition, since the baking is performed while the mold is held by the partition wall material, the partition wall material is fired in a stable state, so that cracks are not generated due to stress and display characteristics can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment of the Present Invention) A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a process sectional view for explaining a partition forming method according to a first embodiment of the present invention, and FIG. 2 is a mold perspective view according to the first embodiment.

In the method of forming a partition of a plasma display panel (hereinafter referred to as PDP) of the present embodiment, first, as shown in FIG. 1A, a partition is formed on a rear glass substrate 1 provided with address electrodes 2 at predetermined intervals. The material layer 3 is formed by screen printing. In the screen printing, a glass mask which is a material of a partition wall is applied in a state where a metal mask having a large opening at the center is set on the rear glass substrate 1, and this is applied to the entire surface of the rear glass substrate 1 with a metal spatula called a squeegee. The metal material is buried in the opening of the metal mask while being spread to form the partition wall material layer 3.

Prior to performing this screen printing,
The rear glass substrate 1 is heated to about 100 ° C. in order to make the thickness of the partition wall material layer 3 uniform. That is,
By keeping the rear glass substrate 1 in a high temperature state of about 100 ° C., it becomes difficult to cause an uneven state due to a change in film thickness due to a change in temperature, humidity, etc. around the printing press.

A general glass paste containing a solvent is:
It becomes a soft state of about 100 PS (poise) at 00 ° C. In this state, a leveling and uniform partition wall material layer can be obtained without being affected by changes in the surrounding environment. Furthermore, when the glass paste dries, since the drying proceeds from inside the paste in contact with the surface of the warm rear glass substrate 1, cracks on the paste surface can be suppressed.

The back glass substrate 1 can be heated in a drying step after washing. For example, the back glass substrate 1 is heated in a drying furnace from above and below or placed on a hot plate. The heating temperature is preferably higher in view of the leveling property, but is preferably about 100 ° C. at which the glass substrate is not distorted. Next, FIG.
As shown in (b), a mold having a shape corresponding to the shape of the partition is placed on the partition material layer 3, and is gradually lowered in the direction of the arrow.

As is apparent from the perspective view of FIG. 2, the mold 5 is composed of convex portions 5a extending in one direction and concave portions 5b alternately arranged with the convex portions 5a. FIG. 2 shows only a part of the mold 5, and actually corresponds to the entire rear glass substrate 1. The mold 5 presses the partition material layer 3 with a predetermined pressure, and as shown in FIG.
As shown in (c), the partition wall material layer 3 is buried in the recess 5b. At this time, the partition wall material layer 3 has an appropriate viscosity, for example, a viscosity of about 800 PS, and is in a state of following the shape of the press of the mold 5.

The concave portion 5b of the mold 5 has a tapered shape extending downward, and has a volume capable of accommodating the partition wall material extruded by the convex portion 5a. However, due to the press of the mold 5, extra material for the partition walls is on both sides of the mold 5.
That is, an appropriate amount of the partition wall material is extruded into the non-display area of the rear glass substrate and accommodated in the concave portion 5b. FIG.
As shown in (c), the baking process of the partition material layer 3 is performed in a state where the mold 5 is held by the partition material layer 3. The mold 5 naturally has higher heat resistance than the partition wall material layer 3 and does not cause deformation or the like due to the baking treatment.

After the sintering process, the mold 5 is lifted and separated to complete the partition 4 as shown in FIG. 1 (d). As described above, the concave portion 5b of the mold 5 has a tapered shape, so that the mold 5 can be easily separated. Although not shown, the mold 5 presses the partition wall material layer by a suction arm or a holding arm, and separates it after firing. The mold after detachment can be repeatedly used for the above-described processing for forming the partition wall.

The excess partition wall material may be removed after firing, but since it is in the non-display area, even if it is left as it is, there is no adverse effect on the display characteristics. According to the first embodiment of the present invention described above, the partition wall material layer 3 is printed in a uniform state, and the partition walls are formed using a mold. Can be obtained. Therefore, the display characteristics of the PDP are also good.

(Second Embodiment of the Present Invention) Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a process cross-sectional view illustrating a partition forming method according to the second embodiment of the present invention, and FIG. 4 is a diagram illustrating a printing process according to the second embodiment. PDP of this embodiment
2A, first, as shown in FIG. 2A, a partition material layer 13 having a preliminary concave portion 13a is formed by screen printing on a back glass substrate 11 provided with address electrodes 12 at predetermined intervals. .

FIGS. 4A and 4B are a perspective view and a sectional view, respectively, showing the state of the screen printing. First, the screen mask 1 having a rectangular opening on the back glass substrate 11 is shown.
6 and place the glass paste 1 in the end region of the opening.
8 is applied using a nozzle or the like. Thereafter, the squeegee 17 having the uneven sliding portion is slid in the direction of the arrow to spread the glass paste 18 over the entire opening.

When the squeegee 17 is slid and the glass paste 18 is spread out, the viscosity of the glass paste 18 is set to about 2000 PS by giving an appropriate drying time. This viscosity maintains the shape to some extent due to the sliding of the squeegee 17, and is a viscosity capable of forming the preliminary concave portion 13a shown in FIG.

That is, FIG. 4 (b) shows a cross-sectional view. The squeegee 17 makes the glass paste 18 conform to its shape at the time of sliding, and after sliding, it returns slightly to its original state due to viscosity.
A gentle preliminary concave portion 13a shown in FIG. 3A is formed. By performing the screen printing using such a squeegee 17, an extra glass paste 18 can be removed, and the subsequent die pressing process can be facilitated.

The squeegee 17 is used for the screen mask 1.
In order to surely spread the glass paste 18 into the opening 6, the glass paste 18 is preferably made of metal. In this case, the protruding portion of the squeegee 17 is set at a height that does not contact the rear glass substrate 11 or the address electrode 12,
It is necessary to prevent damage. Next, as shown in FIG. 3B, a mold 15 having a shape corresponding to the shape of the partition is arranged on the partition material layer 13, and is gradually lowered in the direction of the arrow.

The mold 15 is similar to the perspective view of FIG. 2, and includes a convex portion 5a extending in one direction and a concave portion 5b alternately arranged with the convex portion 5a. Mold 15
Presses the partition wall material layer 13 with a predetermined pressure. However, since the partition wall material layer 13 has the preliminary concave portion 13a, it is necessary to perform the pressing with a light pressure as compared with the first embodiment. Can be. Further, since there is no excess glass paste, the amount of the glass paste extruded into the non-display area on the rear glass substrate 11 is reduced.

FIG. 3C shows a state after the pressing of the mold 15, and the partition wall material layer 13 is embedded in the concave portion 5 b. At this time, the partition wall material layer 13 has an appropriate viscosity, for example, about 800 PS, as in the first embodiment, and is in a state of following the shape of the press of the mold 15. As shown in FIG. 3C, in a state where the mold 15 is held by the partition material layer 13, the partition material layer 1
3 is performed. The mold 15 naturally has higher heat resistance than the partition material layer 13 and does not cause deformation or the like due to the baking treatment.

After the sintering process, the mold 15 is raised and separated to complete the partition 14 as shown in FIG. According to the present embodiment, before performing pressing by the mold 15, screen printing is performed using a special squeegee 17 as shown in FIG.
, The press pressure can be reduced, and excess glass paste can be removed in advance.

[0032]

As described above, in the present invention, after the partition wall material is applied, the partition walls are formed by baking while holding the mold corresponding to the partition wall shape in the partition wall material. As described above, there is no need to perform sandblasting or sticking and patterning of a dry film serving as a mask at the time of sandblasting.

Further, since the baking is carried out while the mold is held in the partition wall material, the partition wall material is fired in a stable state, and the display characteristics can be improved without cracks due to stress.

[Brief description of the drawings]

FIG. 1 is a process sectional view for describing a first embodiment of the present invention.

FIG. 2 is a perspective view of a mold according to the first embodiment of the present invention.

FIG. 3 is a process cross-sectional view for explaining a second embodiment of the present invention.

FIG. 4 is a diagram for explaining a printing process according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view for explaining the structure of the surface discharge type PDP.

FIG. 6 is a process sectional view showing a conventional method of forming a partition wall of a PDP.

DESCRIPTION OF SYMBOLS 1, 11, 41 Back glass substrate 2, 12, 44 Address electrode 3, 13, 42A Partition material layer 4, 14, 42 Partition 5, 15 Mold 16 Screen mask 17 Squeegee 18 Glass paste 30 PDP 34 Display electrode 35 Dielectric layer 43 Phosphor 45 Discharge space

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsuya Torari 5950 Fukuda, Iriki-cho, Satsuma-gun, Kagoshima F-term in Kyushu Fujitsu Electronics Co., Ltd. 5C027 AA09 5C040 FA01 GB03 GB14 GF02 GF19 JA02 JA20 MA24 MA26

Claims (4)

[Claims] 1. A method for forming a partition wall of a plasma display panel in which a discharge space formed between a pair of substrates is partitioned by a partition wall, wherein a first step of applying a partition wall material to a predetermined region of the substrate; A second step of pressing the partition wall material with a mold corresponding to the partition wall shape, a third step of firing while holding the mold on the partition wall material, And a fourth step of separating from the partition wall material. 2. The plasma display panel partition wall forming method according to claim 1, wherein the substrate is subjected to a heat treatment prior to the first step. 3. The plasma display panel partition wall forming method according to claim 1, wherein in the first step, after a partition wall material is applied to a part of the substrate, the partition wall material is applied to the substrate by using an uneven squeegee. A method of forming a partition wall of a plasma display panel, comprising forming a partition wall material layer having a preliminary concave portion by spreading over the entire surface. 4. The method according to claim 3, wherein the uneven squeegee spreads the partition material without contacting the substrate.