JP2002117761A - Plasma display panel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a plasma display panel having a stable discharge characteristic and capable of realizing excellent display quality. SOLUTION: A period for exposing a protective layer to the atmosphere after the formation of the protective layer until a front plate is stuck to a back plate is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel used for a display device and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 1 is a perspective view of an essential part schematically showing an alternating current (AC) type plasma display panel.

In the plasma display panel shown in FIG. 1, a display electrode 12 is formed on a front glass substrate 11, and the entire surface thereof is covered with a dielectric layer 13 and a protective layer 14.

On the other hand, an address electrode 22 is formed on a rear glass substrate 21, the entire surface thereof is covered with a dielectric layer 23, and a partition 24 is formed thereon. Then, the phosphor layers (25, 26, 27) are formed by disposing each color phosphor paste including a red phosphor, a green phosphor, and a blue phosphor in each space sandwiched by the partition walls 24.

A discharge space 30 between the two glass substrates is filled with a gas mixture of Ne—Xe, and the phosphor layers (25, 26, 27) are irradiated with vacuum ultraviolet light (147 nm) having a short wavelength generated by the discharge. Are excited, and visible light of R, G, B is emitted from the front glass substrate side to perform color display.

[0006]

The discharge characteristics of the above-mentioned plasma display panel, such as the discharge voltage, vary within the panel surface, and the discharge voltage becomes high and there are places where light emission is unstable. Was. It is considered that this largely depends on the formation conditions, film quality, and the like of the protective layer 14 in contact with the discharge space 30, but the details are unknown.

However, the substrate on which the dielectric layer and the protective layer are formed is taken out into the air after the formation of the protective layer and is exposed to the air until the front and rear plates are assembled. Since adsorption and reaction of (especially H ₂ O) occur, an impurity gas is released from the protective layer to the discharge space when the panel is formed, and such an impurity gas is considered to affect the discharge characteristics of the panel. .

Means for solving this problem include, for example, gas adsorption generated when the protective layer is exposed to the atmosphere by performing surface modification of the protective layer by, for example, irradiating ultraviolet rays in an atmosphere containing oxygen. Method for preventing the occurrence of the
000-078989). Although the surface modification of the protective layer is an effective means, it requires a facility for surface modification at the same time, and thus has a problem associated with an increase in the number of steps, such as a disadvantage in terms of cost.

[0009]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a method of manufacturing a plasma display panel which realizes excellent display quality with stable discharge characteristics.

In order to achieve the above object, a method of manufacturing a plasma display panel according to the present invention is directed to a front panel and a rear panel each having at least one of a dielectric layer and a protective layer and at least one of a phosphor layer formed thereon. A plasma display panel manufacturing method, comprising: forming the protective layer, and bonding the front plate and the rear plate to each other. Features.

According to the present invention, after the protective layer 14 is formed, the time during which the protective layer 14 is exposed to the atmosphere before the front plate 10 and the rear plate 20 are bonded to each other is shortened to 3 hours or less. In addition, adsorption and reaction of impurity gas (particularly, H ₂ O) to the protective layer 14 can be suppressed. Therefore,
It is possible to reduce the emission of impurity gas from the protective layer to the discharge space when the panel is formed, and it is possible to prevent the discharge characteristics of the panel from deteriorating. Therefore, it is possible to manufacture a plasma display panel that realizes excellent display quality with stable discharge characteristics. In addition, since special processing not required in the conventional process is not required, the effect can be obtained without increasing the number of processes.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a plasma display panel according to the present invention will be described based on specific embodiments. However, such embodiments do not limit the technical scope of the present invention.

FIGS. 1 and 2 are a perspective view and a sectional view, respectively, showing a main part of an AC surface discharge type plasma display panel according to the present embodiment. In these figures, only three cells are shown for convenience. However, in actuality, a number of cells that emit red (R), green (G), and blue (B) light are arranged, and a plasma display panel is formed. It is configured. FIG. 3 shows a flowchart of a manufacturing process of front plate 10 and back plate 20 according to the present embodiment.

First, a method of manufacturing the front plate 10 will be described. After an ITO film is formed on the entire surface of the front glass substrate 11 by a sputtering method, patterning is performed by a photolithography method to form a transparent electrode of ITO. Next, after a photosensitive silver paste is formed on the entire surface, an Ag bus electrode pattern is formed on the ITO by the same photolithography method, and the display electrode 12 is formed by drying and baking Ag. However, an Ag electrode is provided as a bus electrode on a transparent electrode of ITO.) A dielectric glass paste is applied thereon by a screen printing method and then fired to form a dielectric glass layer 13. Then, an MgO film is formed by a sputtering method, a vacuum evaporation method, or the like, and a protective layer 14 is formed on the entire surface of the dielectric glass layer 13 to form the front plate 10.

Next, a method of manufacturing the back plate 20 will be described. First, the address electrode 22 is formed on the rear glass substrate 21 by the same method as the method of forming the Ag electrode on the front plate. A dielectric glass layer 23 is formed thereon by a screen printing method as in the case of the front plate and the panel. Then, the partition walls 24 are formed by a screen printing method or a sand blast method. One of a red (R) phosphor, a green (G) phosphor, and a blue (B) phosphor is disposed in each space between the partition walls 24 by a screen printing method, and dried and fired. Thus, the phosphor layers 25, 26, 27 are formed. Each color R,
For example, the following phosphors are used as the G and B phosphors.

Red phosphor: Y ₂ O ₃ : Eu ³⁺ Green phosphor: Zn ₂ SiO ₄ : Mn Blue phosphor: BaMgAl ₁₀ O ₁₇ : Eu ²⁺ Then, a sealing material layer made of low softening point glass Is formed by a screen printing method or the like (not shown in the figure), and the back plate 20 is formed.

After the protective layer 14 is formed, the time for exposing the protective layer 14 to the atmosphere is set within 3 hours, and the front plate 10 and the rear plate 20 manufactured as described above are bonded together and assembled and sealed. . Then, after evacuating the inside of the discharge space 30 partitioned by the partition wall 24, a discharge gas composed of Ne and Xe is filled in, and aging is performed to produce a plasma display panel.

At the time of driving the plasma display panel, as shown in FIG. 4, each driver and panel driving circuit 40 are connected to the plasma display panel to apply a voltage between the scanning electrode 41 and the address electrode 43 of the cell to be turned on. After the address discharge is performed, the display electrodes 41,
A sustain voltage is applied by applying a pulse voltage between 42. Then, the cell emits ultraviolet light in accordance with the discharge, and is converted into visible light by the phosphor layer. An image is displayed by lighting the cell in this manner.

A characteristic feature of the present embodiment is that after the protective layer 14 is formed, the time during which the protective layer 14 is exposed to the air before the front plate 10 and the rear plate 20 are bonded to each other is within 3 hours. It is to be. By thus shortening the time during which the protective layer is exposed to the atmosphere, the adsorption and reaction of the impurity gas (particularly, H ₂ O) to the protective layer can be suppressed. When exposed to the atmosphere for 3 hours or less, the adsorption and reaction of the impurity gas to the protective layer are slight, and the discharge characteristics of the panel are not significantly deteriorated. Therefore, it is possible to reduce the emission of the impurity gas from the protective layer to the discharge space when the panel is formed, and it is possible to prevent the discharge characteristics of the panel from deteriorating.

The shorter the time of exposure to the atmosphere after the formation of the protective layer, the more the adsorption and reaction of impurity gas (particularly H ₂ O) to the protective layer can be reduced. After that, it is desirable that the time during which the protective layer is exposed to the atmosphere before bonding the front plate and the back plate is as short as possible.

[0021]

As described above, according to the present invention, the time for exposing the protective layer to the atmosphere after forming the protective layer and before bonding the front plate and the back plate is shortened to 3 hours or less. By doing so, adsorption and reaction of impurity gas (particularly H ₂ O) to the protective layer can be suppressed. Therefore, it is possible to reduce the emission of the impurity gas from the protective layer to the discharge space when the panel is formed, and to prevent the deterioration of the discharge characteristics of the panel. A plasma display panel that can be realized can be manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a conventional AC surface discharge type plasma display panel.

FIG. 2 is a schematic sectional view of a conventional AC surface discharge type plasma display panel.

FIG. 3 is a flowchart of a manufacturing process of a front plate and a back plate according to the present invention.

FIG. 4 is a diagram showing a plasma display panel display device in which a driving circuit is connected to the PDP of the present embodiment.

[Explanation of symbols]

 Reference Signs List 10 front plate 11 front glass substrate 12 display electrode 13 dielectric layer 14 protective layer 20 back plate 21 back glass substrate 22 address electrode 23 dielectric layer 24 partition 25 red phosphor layer 26 green phosphor layer 27 blue phosphor layer 30 discharge Space 40 drive circuit 41 scan electrode 42 sustain electrode 43 address electrode

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masafumi Okawa 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C012 AA09 BC03 5C027 AA10 5C040 FA01 GE07 GE10 HA01 JA28 KA03 MA23 MA26

Claims (4)

[Claims] 1. A method for manufacturing a plasma display panel comprising a front plate and a back plate having at least one of a dielectric layer and a protective layer formed thereon and at least one of them having a phosphor layer, wherein the protective layer is A method of manufacturing a plasma display panel, wherein a time for exposing the protective layer to the atmosphere is within 3 hours after the formation and before the bonding of the front plate and the back plate. 2. The method according to claim 1, wherein the protective layer is a film made of magnesium oxide (MgO). 3. Between a pair of parallelly arranged plates,
A plasma display panel in which electrodes and phosphor layers of a plurality of colors are provided and a gas medium is sealed, wherein the plasma display panel is manufactured by the manufacturing method according to claim 1 or 2. 4. A plasma display panel display device comprising a plasma display panel and a driving circuit for driving the plasma display panel, wherein the plasma display panel is the plasma display panel according to claim 3. Plasma display panel display.