JPH07272629A - Formation of phosphor screen for plasma display panel - Google Patents

Abstract

PURPOSE:To easily form an accurate phosphor screen on the wall surface of the cell barrier of a plasma display panel having a large area and a highly fine pattern. CONSTITUTION:A pattern is formed on a cell barrier 3 laid on a substrate 1 using dry film resist 4, and the prescribed cell is charged with phosphor paste 6 through the pattern. Then, the paste 6 is dried, thereby forming a phosphor layer 8 in the cell. Thereafter, the dry film resist 4 is separated and subjected to a sand blast 9, thereby eliminating the unnecessary portion of the layer 8 on the wall surface of the barrier 3. Then, the layer 8 remaining on the wall surface of the barrier 3 is baked, thereby forming a phosphor screen 10. In this case, the sand blasting process takes place after the cell is properly charged with the paste 6 and, therefore, an accurate phosphor screen can be easily formed.

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, as a method of forming a phosphor screen on a wall surface of a cell barrier in a reflection type PDP, three kinds of phosphor pastes of red (R), green (G) and blue (B) are prepared by a screen printing method. There is known a method of forming a predetermined phosphor screen through a sand blasting process and a firing process after selectively filling and drying each of them in a predetermined barrier space (see, for example, JP-A-6-5205). .

[0003]

In the method described in the prior art, since the phosphor paste is filled in the barrier space by the screen printing method, it is advantageous in terms of production efficiency, but the panel becomes large and the resolution is high. As a result, it becomes difficult to align the screen printing plate and the panel, and the filled phosphor paste causes color mixing, which makes it impossible to form an accurate phosphor screen.

The present invention has been made in view of the above problems, and an object thereof is to easily form an accurate fluorescent screen on the wall surface of a cell barrier of a PDP having a large area and a high definition pattern. Another object of the present invention is to provide a method for forming a fluorescent screen that can be used.

[0005]

In order to achieve the above object, the present invention provides a front plate and a rear plate having cell barriers constituting a plurality of matrix-shaped or line-shaped display element cells, which are parallel to each other. A method of forming a phosphor screen on the wall surface of the cell barrier of the plasma display panel arranged so as to face the step of forming a pattern of a dry film resist on the cell barrier on the back plate. A step of forming a phosphor layer in the barrier space by filling and drying a phosphor paste in a predetermined barrier space through the pattern; a step of removing the dry film resist; and a cell barrier by sandblasting. A step of removing unnecessary portions by leaving the phosphor layer on the wall surface of
And a step of baking the phosphor layer attached to the wall surface of the cell barrier.

In the case of forming a color PDP, pattern formation by a dry film resist, formation of a phosphor layer by filling and drying a phosphor paste, for phosphors having red, green and blue emission colors, respectively, Each step of removing the dry film resist is repeated.

[0007]

In the method of forming a phosphor screen having the above-mentioned structure, the pattern formed by the dry film resist accurately corresponds to the position of a predetermined cell, and the phosphor paste can be accurately filled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process chart showing an embodiment of a method for forming a phosphor screen of a PDP according to the present invention, and this embodiment will be described below by following each step of the drawing.

First, as shown in (a), a pattern of electrodes 2 and cell barriers 3 is formed on a substrate 1 made of glass and then baked. In this embodiment, the electrodes 2 have a pitch of 0.5 m.
m, a line width of 0.3 mm, and a film thickness of 20 μm, and the cell barrier 3 has a pitch of 0.5 mm and a line width of 100 μm.
m and a film thickness of 200 μm.

Next, a dry film resist 4 (manufactured by Mitsubishi Rayon Co., Ltd.) was laminated on the cell barrier 3 by a heat roll, and exposed by irradiating ultraviolet rays through a mask 5 having a predetermined pattern as shown in FIG. After that, patterning was performed by developing with an aqueous solution of sodium carbonate.

Next, as shown in (c), a G phosphor paste 6 is filled in a barrier space as a discharge space surrounded by the cell barrier 3 by using a squeegee 7 for screen printing and left for a predetermined time. To dry. In this example, a solvent-based paste was used so that the phosphor paste 6 would not dissolve into the stripping solution when the dry film resist 4 was stripped in the next step. Specifically, ethyl cellulose as a resin, BCA (diethylene glycol mono-n-butyl ether acetate) as an organic solvent, and Zn as a phosphor.
₂ SiO ₄ : Mn was used, and a phosphor paste having a composition obtained by mixing 5 parts by weight, 40 parts by weight, and 55 parts by weight, respectively, was used. Although the rubber squeegee 7 for screen printing is used as the filling means of the phosphor paste 6, this does not limit the present invention, and the filling may be made by other means such as a spray method.

After the phosphor paste 6 is filled and dried, the dry film resist 4 is peeled off with an aqueous sodium hydroxide solution and post-baked and dried at 120 ° C. During this drying step, the organic layer in the phosphor paste 6 evaporates, so that the phosphor layer 8 is dented at the center of the cell. Thus, for the remaining B and R phosphor pastes, by repeating the same steps (dry film laminating to post-baking and drying steps), as shown in (d), the phosphor layer 8 of each color is placed at a predetermined position. Was formed.
The B and R phosphor pastes include BaMgAl ₁₄ O ₂₃ : Eu ²⁺ , (Y, Gd) B as phosphors, respectively.
O ₃ : Eu ³⁺ was used, and a resin having a composition in which the same resin and organic solvent as described above were mixed in the same proportions was used.

Next, as shown in (e), unnecessary portions of the phosphor layer 8 are removed by sandblasting 9. In this step, the polishing agent is sprayed onto the substrate 1 at a high speed, and unnecessary portions are removed while leaving the phosphor layer 8 made of a phosphor and a binder on the wall surface of the cell barrier 3 to remove the surface of the electrode 2. A discharge space was formed by exposing.
Here, the electrode material and the barrier material have been previously fired,
Since the sandblasting speed is slower than that of the phosphor layer 8, the sandblasting treatment can be performed with almost no damage to the surface of the electrode 2 or the upper portion of the barrier 3. The film thickness of the phosphor layer 8 attached to the wall surface of the barrier 3 can be controlled by the conditions and time of the sandblast treatment.

Finally, in the step (f), the phosphor layer 8 was fired to bond the phosphor 10 to the wall surface of the cell barrier 3. As a result, each phosphor 10 having R, G, B emission colors
It was possible to obtain the substrate 1 patterned on the wall surface of the predetermined barrier 3 respectively.

[0015]

As described above, the PD according to the present invention
In the method for forming the phosphor screen of P, the cell barrier on the back plate is patterned with the dry film resist, and the phosphor paste is filled into the predetermined barrier space through the pattern, so that the phosphor paste is filled accurately. Since the unnecessary portion of the phosphor paste is removed by sandblasting after being performed, it is possible to easily form an accurate phosphor screen even on the wall surface of the cell barrier of the PDP having a large area and a high definition pattern. You can

[Brief description of drawings]

FIG. 1 is a process chart for explaining an embodiment of a method for forming a phosphor screen of a plasma display panel according to the present invention.

[Explanation of symbols]

 1 Glass Substrate 2 Electrode 3 Cell Barrier 4 Dry Film Resist 5 Mask 6 Phosphor Paste 7 Rubber Squeegee 8 Phosphor Layer 9 Sandblast 10 Phosphor

Claims (3)

[Claims] 1. A plasma display panel comprising a front plate and a rear plate having cell barriers constituting a plurality of matrix-shaped or line-shaped cells for display elements arranged in parallel to each other. A method of forming a phosphor screen on a wall surface of a cell barrier, comprising a step of forming a pattern by a dry film resist on the cell barrier on the back plate, and filling a phosphor paste into a predetermined barrier space through the pattern. A step of forming a phosphor layer in the barrier space by drying by drying, a step of removing the dry film resist, and a step of removing unnecessary portions by leaving the phosphor layer on the wall surface of the cell barrier by sandblasting. ,
And a step of baking the phosphor layer adhered to the wall surface of the cell barrier. 2. The steps of forming a pattern with a dry film resist, forming a phosphor layer by filling and drying a phosphor paste, and removing the dry film resist for phosphors having red, green, and blue emission colors, respectively. The method for forming a fluorescent screen of a plasma display panel according to claim 1, wherein the method is repeated. 3. The method for forming a phosphor screen of a plasma display panel according to claim 1, wherein the phosphor paste is filled using a screen printing rubber squeegee.