JP2002117759A - Plasma display panel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel having a good discharge characteristic and capable of realizing excellent display quality and to provide a manufacturing method capable of stably manufacturing the plasma display panel. SOLUTION: A substrate having a dielectric layer and a protective layer formed is stored in vacuum, in a dry gas or in an inert gas after forming the protective layer.

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, when the panel is formed, an impurity gas is released from the protective layer to the discharge space, and such an impurity gas is considered to affect the discharge characteristics of the panel.

[0008]

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 method of manufacturing a plasma display panel, comprising: forming a protective layer, and then performing a process of assembling the front plate and the back plate until the substrate on which the dielectric and the protective layer are formed is dried in a dry gas atmosphere. It is characterized by being stored inside or in an inert gas atmosphere.

According to the present invention, adsorption and reaction of impurity gas (particularly H ₂ O) to the protective layer can be suppressed by storing in a vacuum, a dry gas atmosphere, or an inert gas atmosphere. it can. 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. Therefore, it is possible to manufacture a plasma display panel that realizes excellent display quality with stable discharge characteristics.

[0011]

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 show a perspective view and a sectional view of 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.
Thereafter, as shown in FIG. 3, the front plate 10 is stored in a vacuum, a dry gas atmosphere, or an inert gas atmosphere until the front plate 10 and the back plate 20 are assembled.

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.

The front plate 10 and the back plate 20 manufactured as described above are bonded together for sealing. And the partition 2
After evacuating the inside of the discharge space 30 partitioned by 4, Ne
And a discharge gas made of Xe, 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.

The characteristic feature of this embodiment is that after forming the protective layer, the substrate on which the dielectric layer and the protective layer are formed is assembled into a front plate and a back plate until the process, in a vacuum, in a dry gas atmosphere, Alternatively, it is stored in an inert gas atmosphere. By storing in a vacuum, a dry gas atmosphere, or an inert gas atmosphere, adsorption and reaction of an 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 it is possible to prevent the discharge characteristics of the panel from deteriorating.

It should be noted that an impurity gas (particularly H
_When storing in a vacuum or an inert gas atmosphere in order to suppress the adsorption and reaction of ₂ O), it is preferable that the storage atmosphere has a partial pressure of water vapor of 1 Torr (133 kPa) or less, and a dry gas atmosphere. When storing at a pressure of 1 Torr (133 kPa)
It is desirable that:

After the formation of the protective layer, the substrate on which the dielectric layer and the protective layer are formed is desirably moved to a vacuum, a dry gas atmosphere, or an inert gas atmosphere without being taken out to the atmosphere. However, when the protective layer is taken out into the atmosphere and transferred to a vacuum, a dry gas atmosphere, or an inert gas atmosphere after formation of the protective layer, the adsorption and reaction of the impurity gas to the protective layer can be performed by short-time exposure to the atmosphere. Since only a small amount is observed and no significant deterioration in the discharge characteristics of the panel is observed, it is not limited to storage in a vacuum, a dry gas atmosphere, or an inert gas atmosphere without taking out to the atmosphere. Absent.

[0021]

As described above, according to the present invention, after forming the protective layer, the substrate on which the dielectric layer and the protective layer are formed is stored in a vacuum, a dry gas atmosphere, or an inert gas atmosphere. Thus, the impurity gas (especially H
It is possible to suppress the adsorption and reaction of the ₂ O). 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 on the front page (72) Inventor Masafumi Okawa 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5C027 AA05 AA10 5C040 FA01 FA04 GB03 GB14 GD09 GD10 GE09 GE10 JA28

Claims (9)

[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 After the formation, the substrate on which the dielectric and the protective layer are formed is stored in a vacuum until the front plate and the back plate are assembled. 2. 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 on at least one of them and a phosphor layer formed on at least one of the two layers. After the formation, the substrate on which the dielectric and the protective layer are formed is stored in an inert gas atmosphere until the front plate and the rear plate are assembled. 3. The method according to claim 2, wherein the inert gas is a rare gas. 4. The storage atmosphere has a partial pressure of water vapor of 1 Torr.
4. The method for manufacturing a plasma display panel according to claim 1, wherein the pressure is not more than r (133 kPa). 5. 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 After the formation, the substrate on which the dielectric and the protective layer are formed is stored in a dry gas atmosphere until the front plate and the back plate are assembled. 6. The method according to claim 5, wherein the drying gas comprises dry air. 7. The partial pressure of water vapor of the drying gas is 1 Torr (1
7. The method for manufacturing a plasma display panel according to claim 5, wherein the pressure is 33 kPa) or less. 8. Between a pair of parallelly arranged plates,
A plasma display panel in which an electrode and phosphor layers of a plurality of colors are arranged and a gas medium is sealed, wherein the plasma display panel is manufactured by the manufacturing method according to any one of claims 1 to 7. panel. 9. 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 8. Plasma display panel display.