JPH09161677A - Method for forming fluorescent surface of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an appropriate priming effect by laminating a material, of which wetting property and of which penetrating property in relation to the phosphor paste solvent are low, on the top of a barrier, and filling the paste, and thereafter, eliminating the residual quantity of the paste on the top part with sand blasting. SOLUTION: After laminating a material 6 on the top of a cell barrier 5, burning is performed. A barrier space, which is surrounded by the barrier 5 and the material 6, is filled with the phosphor paste, and the paste is dried so that the solvent of the paste is vaporized, and a phosphor layer 8 is formed into the shape that a central part of the cell is recessed. This process is repeated three times per each paste in red, green and blue so as to form each colored phosphor layer 8. The phosphor layer 8, which is heaped on an electrode pad 4, is eliminated by sand blasting so as to form a fluorescent surface. At this stage, the material 6, of which wetting property and of which penetrating property in relation to the solvent are low, is used so that the phosphor layer 8 on the material 6 can be easily eliminated after the sand blasting for exposing the pad 4 and that smoothness of the top of the barrier 5 is secured so as to form the excellent shape of a priming slit and that the appropriate priming effect can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing process of a plasma display panel (hereinafter referred to as PDP), and more particularly to a method of forming a fluorescent screen on a cell barrier of a PDP.

[0002]

2. Description of the Related Art Conventionally, it has been proposed to provide a fluorescent screen on a wall surface of a cell barrier that defines a discharge space for the purpose of improving the brightness of a PDP. As a method of forming a fluorescent screen on the wall surface of the cell barrier, screen printing is used to selectively fill three kinds of red (R), green (G), and blue (B) phosphor pastes into predetermined barrier spaces. A method is known in which the phosphor layer deposited on the bottom surface is removed using a sandblast method, etc., and the electrodes required for discharge are exposed to form a predetermined phosphor screen after drying. See, for example, Japanese Patent Laid-Open No. 6-5205). In addition, the phosphor paste is completely filled in the barrier space so as to be smooth with the top of the cell barrier, and then a sandblast-resistant mask is formed in a pattern in which the phosphor remains only on the wall surface, and then only the wall surface is sandblasted. There is also known a method of forming a fluorescent screen on the.

[0003]

The method described in the prior art has the advantage that the production process is simple because it does not use a photosensitive paste, but it selectively operates only in the barrier space. Since it is difficult to fill the phosphor paste, there is a large amount of phosphor remaining at the top of the barrier after filling and drying the phosphor paste, and it is difficult to remove the remaining phosphor even after sandblasting. there were.
If the top of the cell barrier is not smooth as described above, the shape of the priming slit is deteriorated, which causes a problem that an appropriate priming effect cannot be secured.

The present invention has been made in view of the above problems, and an object thereof is to reduce the residual phosphor on the cell barrier so that an appropriate priming effect can be exhibited. It is to provide a method for forming a phosphor screen of a PDP.

[0005]

In order to achieve the above object, a phosphor screen forming method according to the present invention fills a phosphor paste in a barrier space as a discharge space surrounded by a cell barrier and having an electrode on the bottom surface. And drying to evaporate the solvent contained in the phosphor paste to form a phosphor layer having a recessed shape in the central portion of the barrier space, and exposing the electrode portion necessary for discharge if necessary. In the method for forming a phosphor screen of a PDP, which includes a step of removing the phosphor layer deposited on the electrode by sandblasting in order to
Before the phosphor paste is filled, a material having low solvent wettability and / or permeability of the phosphor paste is laminated on the top of the cell barrier.

As the above-mentioned material, 0.001 g of the solvent used for the phosphor paste was dropped on the surface of the sample formed by coating on the substrate and firing, and the sample was left for 5 minutes in a horizontal state. The diameter of the spread part on the sample surface is 10 mm
The following materials are used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First, the material evaluation method performed in this embodiment is as shown in FIG. The solvent c (butyl carbitol acetate) used in the phosphor paste is applied to the surface of the sample b (film thickness after baking: 10 μm) formed by applying and baking on the substrate a, the micro syringe d (needle inner diameter). : 0.3 mm).
The dropping amount is 0.001 g. Leave it horizontal for 5 minutes at room temperature and atmospheric pressure. The diameter A of the spread portion of the solvent c on the sample surface is measured.
The measurement of the spread portion includes both the sample surface portion and the penetration portion.

Table 1 shows the materials used in this embodiment and the measurement results by the above evaluation method.

[0010]

[Table 1]

A sectional view of the panel used is shown in FIG.
(B). The panel shown in FIG. 2A is a glass substrate 1.
The patterns of the electrode 2, the overcoat 3, the electrode pad 4, and the cell barrier 5 are formed on the top surface by a screen printing method, a filling method, a sandblast method, etc., and baked. The panel shown in FIG. 2B is obtained by stacking the material 6 of Table 1 on the top of the cell barrier 5 and then firing it. In this embodiment, the cell barriers 5 have a pitch of 500 μm and a line width of 1
A panel having a matrix pattern of 00 μm and a film thickness of 150 μm, in which a square electrode pad 4 having a side of 150 μm is exposed near the center of the bottom surface of the barrier space was used.

Then, as shown in FIGS. 3 (a) and 3 (b), a phosphor paste 7 is screen-printed into the cell barrier 5 or a barrier space surrounded by the cell barrier 5 and the material 6 as a discharge space. After filling, it was dried at 150 ° C. for 20 minutes. By thus filling the barrier space with the phosphor paste 7 and drying, the solvent contained in the paste is vaporized, and as shown in FIGS. 4 (a) and 4 (b),
The phosphor layer 8 made of a phosphor and a paste has a concave shape at the center of the cell. Then, this step was performed three times in total for the red (R), green (G), and blue (B) phosphor pastes to form the phosphor layers 8 of the respective colors in the predetermined barrier spaces. During this filling and drying, the phosphor layer 8 remains on the barrier 5 and the material 6 as shown in FIGS. 4 (a) and 4 (b).

As the phosphor powder, red phosphor and Y ₂ O are used.
₃ : Eu, BaAl ₁₂ O ₁₉ : Mn was used for the green phosphor, and BaMgAl ₁₄ O ₂₃ : Eu ²⁺ was used for the blue phosphor. The phosphor paste used was a paste in the weight ratio of phosphor / binder resin (ethyl cellulose) / solvent (butyl carbitol acetate) = 50/5/45. Although the screen printing method is used as the filling means of the phosphor paste, the present invention is not limited to this and may be filled by other means such as a spray method. Further, the phosphor, the binder resin, and the solvent are not limited to these, and may be appropriately selected depending on the combination with the barrier material. What is important is how the phosphor paste spreads when it is applied to the barrier material or how easily it is impregnated.

Subsequently, the phosphor layer 8 deposited on the electrode pad 4 to expose the electrode portion required for discharge was removed by sandblasting to form a phosphor screen. As a result, for a panel in which the material 6 is not laminated on the barrier 5, FIG.
Barrier 5 even after sandblasting as shown in (a)
There was a large amount of phosphor remaining at the top of the. In addition, in the laminated material 6, the material "NP7" having a double-digit measured value shown in Table 1 is used.
In the case of using "948" (manufactured by Noritake Company Limited), the amount of phosphor remaining on the laminated material is large, whereas in the case of using the single-digit material "PLS3232" (manufactured by Nippon Electric Glass Co., Ltd.) As shown in FIG. 5B, the phosphor layer on the laminated material 6 could be removed.

[0015]

As described above, the PD according to the present invention
The method for forming the phosphor screen of P is as follows. The phosphor space is filled with a phosphor paste and dried to form a phosphor layer having a recessed shape in the central part of the barrier space. In the phosphor screen forming method for exposing the necessary electrode portion, before filling the phosphor paste,
By depositing a material having low solvent wettability and / or permeability of the phosphor paste on the top of the cell barrier, the residual amount of the phosphor on the barrier after sandblasting is controlled, and as a result, The smoothness of the top of the barrier can be secured, and an appropriate priming effect can be exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a material evaluation method.

FIG. 2 is a cross-sectional view of a panel used in the embodiment.

FIG. 3 is a cross-sectional view showing a state immediately after filling the barrier space with a phosphor paste.

FIG. 4 is a cross-sectional view showing a state after the filled phosphor paste is dried.

FIG. 5 is a cross-sectional view showing a residual state of a phosphor layer after sandblasting.

[Explanation of symbols]

 1 Glass Substrate 2 Electrode 3 Overcoat 4 Electrode Pad 5 Cell Barrier 6 Material 7 Phosphor Paste 8 Phosphor Layer

Claims (2)

[Claims] 1. A phosphor paste is filled in a barrier space as a discharge space which is surrounded by a cell barrier and has an electrode on the bottom surface, and is dried to vaporize a solvent contained in the phosphor paste to thereby vaporize the solvent in the barrier space. Plasma display panel including a step of forming a phosphor layer having a recessed shape in a central portion, and a step of removing a phosphor layer deposited on the electrode by sandblasting to expose an electrode portion required for discharge, if necessary In the method for forming a phosphor screen, the phosphor screen of the plasma display panel is characterized in that a material having low solvent wettability and / or permeability of the phosphor paste is laminated on the top of the cell barrier before the phosphor paste is filled. Forming method. 2. The sample surface when 0.001 g of the solvent used for the phosphor paste is dropped on the surface of the sample formed by coating and baking the material on the substrate, and the sample surface is left for 5 minutes in a horizontal state. The method for forming a phosphor screen of a plasma display panel according to claim 1, wherein the material is such that the diameter of the widened portion is 10 mm or less.