JPH0547303A - Manufacture of plasma display panel - Google Patents

Abstract

PURPOSE:To enable easily coating a phosphor onto the substrate surface and partition side surface constituting a picture element in a color plasma display having a partition. CONSTITUTION:Using a screen 1 having an opening 2, a phosphor paste 4 is forcibly pressed in through this opening 2. A phosphor film 17 is thereby formed on the side surface of a partition 16 as well as the face of a substrate, both constituting the inner wall surfaces of a picture element. Since the opening 2 of the screen 1 may be smaller in size than the picture element, even if displacement in position of the screen 1, or expansion and contraction thereof, somewhat occurs, it is possible to easily form the phosphor film on the bottom surface and both the side surfaces in the object picture element. Separate coating of three-colored phosphor also is easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel used in personal computers, office workstations, or wall-mounted televisions, which are expected to grow in recent years, and more particularly to coating phosphors. Regarding the method.

[0002]

2. Description of the Related Art There are many types of conventional plasma display panels. Here, FIGS. 4 (A) and 4 (B) are used.
The structure shown in will be described. This plasma display panel includes a first insulating substrate 1 made of glass.
1. Second insulating substrate 12, also made of glass, row electrode 1
3, a column electrode 14, a discharge gas space 15 filled with a discharge gas such as He, Xe, a partition wall 16 that secures the discharge gas space 15 and divides pixels, and converts ultraviolet light generated by discharge of the discharge gas into visible light. The phosphor film 17, the insulator 18 covering the row electrodes, and the protective film 19 made of MgO or the like for protecting the insulator 18 against discharge. Note that FIG.
In (A), reference numeral 20 indicates a pixel.

[0003]

In order to manufacture the phosphor film 17 of the plasma display panel having the structure shown in FIG. 4, the well-known photolithography method used for manufacturing the phosphor screen of the color CRT is often used. (For example, "Development of phosphor coating technology for 20-inch discharge display panel", Technical Report of Television Society, Vol. 11, N.
o. 27, pp49 to 54 (Nov. 1987), etc.). However, since a display having higher brightness and being easy to see has been demanded, a panel having a structure in which the phosphor film 17 is applied even on the partition 16 as shown in FIG. 2 has been devised. However, the second insulating substrate 1
It has been difficult to form a phosphor film on the side walls of the barrier ribs 16 standing on the column 2 and the column electrodes 14 and almost vertically, by the conventional photolithography method. An object of the present invention is to provide a method for easily manufacturing a phosphor film in a plasma display panel having the structure shown in FIG.

[0004]

According to the present invention, in a plasma display panel having at least two substrates for enclosing a discharge gas, discharge electrodes arranged on the substrates, and barrier ribs for partitioning pixels, On the inner wall that constitutes a part of the pixel composed of one substrate and the partition wall, the phosphor paste is pressed and applied through a screen or a metal mask having an opening at a position corresponding to the pixel to which the phosphor is applied,
A method for manufacturing a plasma display panel, which comprises forming a phosphor film, is obtained.

Further, according to the present invention, a phosphor film is formed by using a screen or a metal mask in which a portion in contact with a partition wall is made of a material in close contact with each side. A method is obtained.

Further, according to the present invention, there is provided a method of manufacturing a plasma display panel, which is characterized in that a phosphor film is formed by using a partition wall made of a porous material.

[0007]

The present invention has solved the conventional problems by adopting the above-mentioned configuration. That is, first, the phosphor paste,
It is pressed into the pixel inner surface formed by the second insulating substrate 12 and the partition 16 through the opening of the screen or the metal mask. After that, the phosphor film can be easily formed on the inner wall of the pixel by firing to burn off the volatile component and the binder component in the paste.

At this time, when the phosphor paste is pushed in using a screen or a metal mask made of a material in which the portion in contact with the barrier rib is in close contact with the barrier rib, the paste pushed into one cell is transferred to the adjacent cell. I was able to prevent it from flowing. This is because when manufacturing a full-color panel, it is necessary to use three types of phosphor materials to be applied to each pixel and to change the emission color by changing the type of phosphor of each pixel. It was very effective in preventing the deterioration of the color purity of the color.

However, when the phosphor paste is pushed into the inner surface of the pixel by using a thick film printing screen or a metal mask whose portion contacting the partition is made of a material that is in close contact with the partition, the air in the pixel is Since there is no outlet for the paste, the paste may not come out properly. In order to prevent this, a porous material is used as the partition wall, and only air is extruded to the outside of the pixel through the partition wall, whereby good paste removal can be obtained. Hereinafter, it will be described in more detail with reference to Examples.

[0010]

EXAMPLE A plasma display panel having the cross-sectional structure shown in FIG. 2 was prepared. First insulating substrate 11
A soda glass plate is used for the second insulating substrate 12, a transparent nesa film (a transparent conductive material containing SnO ₂ as a main component) is used for the row electrodes 13, a thin aluminum electrode is used for the column electrodes 14, and a discharge gas space is used. As a gas to be filled in 15, He containing 2% of Xe was used at a pressure of 250 Torr. The partition wall 16 has a width of 100 μm and a height of 200 μm and is formed on the second insulating substrate 12 on which the column electrodes 14 are formed. The phosphors forming the phosphor film 17 are the following three types of phosphors often used in plasma display panels, namely, green: Zn ₂ SiO ₄ : Mn, red: (Y, Gd) B.
O ₃ : Eu and blue: BaMgAl ₁₄ O ₂₃ : E were used for each pixel. Furthermore, the insulator 1 on the first insulating substrate 11
8 was overlaid and protective 019 made of MgO was formed by vacuum evaporation.

To form the phosphor film 17, first, as shown in FIG. 1A, a squeegee 3 is used by using a screen 1 having an opening 2 for pushing the phosphor paste 4 into a pixel to be printed. By moving in the direction of the arrow in the figure, the phosphor paste 4 was pushed into the pixel inner wall defined by the second insulating substrate 12 and the partition wall 16. Note that FIG. 1 shows a cross section of a portion where the column electrode 14 is not provided for the sake of clarity. The opening 2 of the screen 1 did not necessarily have to fit the size of the inner wall of the pixel, and the phosphor could be sufficiently pushed in with an area smaller than the pixel. Therefore, even when a large-area display is produced, it is convenient because an error such as screen elongation can be absorbed. Further, it goes without saying that a metal mask which has been widely used in the past or an equivalent thereof may be used instead of the screen. As shown in FIG. 1 (B), the phosphor paste 4 pushed in is left for several tens of minutes for leveling, and then fired at 500 degrees.
The phosphor film 17 as shown in (C) could be obtained.

When the phosphor is pushed in, if the pushing amount is too large, the phosphor paste 4 may overflow from the inside of the pixel, and an unnecessary phosphor film may be formed in the adjacent pixel. .. In this case, it is sufficient to adjust the pushing condition to adjust the pushing amount to an appropriate value, but it is difficult to adjust the pushing amount uniformly over a large area, so even if the pushing condition varies to some extent, it is uniform. It is desirable to be able to push. Therefore, as shown in FIG. 3 (A), by using the screen 1 having the elastic portion 5 in the portion in contact with the partition wall 16, the phosphor paste substantially fills the pixel portion into which the phosphor is to be pushed, and outside the pixel. When the overflow was prevented, a good phosphor film was obtained with no coating when the coating amount was uniform. The phosphor film thickness can be adjusted by the amount of volatile components in the paste. Moreover, even if the elastic portion 5 is not provided, as shown in FIG. 3B, it is possible to obtain a sufficient effect by using the screen 6 having an elastic surface by thickening the resin itself of the screen in contact with the partition wall 16. Was given. That is, as shown in FIG. 3C, by using a screen 6 having a sufficiently thick resin 7 and an elastic surface having a smooth surface on the side in contact with the partition wall 16, Sufficient effect was obtained to prevent overflow.

However, if the airtightness of the portion where the partition wall 16 and the screen 1 are in contact with each other is increased too much, the airtightness in the pixel becomes too good when the phosphor paste is pushed in, and the paste pushed in when the paste is pushed There was a case that air bubbles were left behind. Therefore, when the partition wall 16 is made of a porous material so that the phosphor material does not pass through but the air does pass through, it becomes possible to suppress the generation of such bubbles. As the porous partition wall material, a material having a low melting point glass mixed with a large amount of fine powder of Al ₂ O ₃ or TiO ₂ and fired exhibited good air permeation characteristics.

In the above embodiments, the case of the plasma display panel shown in FIG. 2 was described, but it goes without saying that the present invention is not limited to this and can be applied to any type of plasma display panel. Nor.

[0015]

As is apparent from what has been described above,
By using the method for manufacturing a phosphor film of the present invention, it becomes possible to easily form the phosphor film over a wide area of the pixel inner wall. Further, since the forming method is simple and the tolerance for dimensional error at the time of manufacturing is wide, it is industrially very useful.

[Brief description of drawings]

FIG. 1 is a step (A) of a manufacturing method according to a first embodiment of the present invention.
It is a figure which shows- (C).

FIG. 2 is a plan view (A) and a sectional view (B) of a plasma display panel to which the manufacturing method of the present invention is applied.

FIG. 3 is a diagram illustrating a second embodiment of the present invention.

FIG. 4 is a plan view (A) and a sectional view (B) showing a conventional plasma display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 screen 2 opening part 3 squeegee 4 phosphor paste 5 elastic part 6 screen 7 having elastic surface 7 resin 8 gauze 11 first insulating substrate 12 second insulating substrate 13 row electrode 14 column electrode 15 discharge gas space 16 partition wall 17 phosphor film 18 Insulator 19 Protective film 20 Pixel

Claims (3)

[Claims] 1. A method of manufacturing a plasma display panel, comprising: at least two substrates enclosing a discharge gas; a discharge electrode disposed on the substrates; and barrier ribs for partitioning pixels. The phosphor paste is pressed onto the inner wall forming a part of the pixel through a screen or a metal mask having openings at positions corresponding to the pixels to be coated with the phosphor to form a phosphor film. Method for manufacturing plasma display panel. 2. The method of manufacturing a plasma display panel according to claim 1, wherein the phosphor film is formed by using a screen or a metal mask made of a material in which a portion in contact with the partition wall is in close contact with the partition wall. And a method for manufacturing a plasma display panel. 3. The method of manufacturing a plasma display panel according to claim 2, wherein the phosphor film is formed by using partition walls made of a porous material.