JP2000030618A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel securely keeping reliability for sealing a glass substrate and having enhanced efficiency in working. SOLUTION: In this plasma display panel, the surrounding part of confronting glass substrates 1, 3 on its display surface side and its back side is sealed by a sealing layer and a barrier rib 6 to partition a discharge space 7 in the discharge space 7 formed between the substrates 1, 3 is provided. Sealing layers 12, 13 are doubly formed, crystalline glass is used for the sealing layers 12, 13 for the inside and amorphous glass is used for the sealing layers for the outside.

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 (PDP) of a self-luminous type using gas discharge.

[0002]

2. Description of the Related Art In recent years, it has been expected that a surface discharge AC drive type PDP will be put to practical use as a large and thin color display device. FIG. 3 shows an example of the structure of an AC-driven PDP.

In FIG. 3, a glass substrate 1 on the display surface side has a transparent electrode made of a transparent conductive film and an end portion opposite to a discharge gap of the transparent conductive film in order to supplement the conductivity of the transparent conductive film. A plurality of pairs of row electrodes X and Y composed of a metal electrode formed of a metal film laminated on the substrate are formed so as to be parallel to each other, and are further formed to cover the row electrodes X and Y to form a dielectric. A body layer 2 is formed. On the dielectric layer 2, a protection layer (not shown) made of MgO is formed.

On the other hand, on the inner surface of the glass substrate 3 on the back side, a plurality of column electrodes 4 arranged at predetermined intervals so as to be orthogonal to the paired row electrodes X and Y, and electrodes covering the column electrodes 4. A protective layer 5 is formed. Further, strip-shaped ribs (partitions) 6 having a predetermined height are provided between the respective column electrodes 4 on the glass substrate 3 on the rear side, so that the discharge space 7 is formed in the display line direction for each unit light emitting area. The gap size of the discharge space 7 is defined. Furthermore, on the upper surface of the column electrode 4 of the glass substrate 3 on the back side and the side surface of the partition wall 6,
The phosphor layers 8 of three colors of R, G and B are provided. The glass substrates 1 and 3 are sealed around the periphery thereof with a sealing layer 11, and the interior space is filled with a rare gas (not shown).

[0005] The above-mentioned PDP is prepared by the following steps. First, after providing the above-described components for each glass substrate, a frit paste containing an amorphous or crystalline glass powder as a main component so as to surround the display region in the outer non-display region of one of the glass substrates is used. Applying, pre-baking and sealing layer 1
Form one.

Thereafter, in a state where the two glass substrates are superimposed and temporarily fixed, a heat treatment is performed at about 400 ° C. to seal the sealing layer 11 to the two glass substrates 1 and 3 by heat fusion.
By exhausting the internal space and enclosing the rare gas, PD
P is formed by sealing. In addition, this exhaust treatment includes exhausting pyrolysis gas generated in the internal space at the time of pre-firing or thermal fusion of the frit paste, as well as impurities such as moisture and carbon dioxide remaining or adsorbed on the sealing layer 11. These gases are exhausted, and the higher the heating temperature during the exhaust treatment, the easier these gases are exhausted.

[0007]

As described above, in the conventional PDP, the sealing layer 11 for sealing the periphery of the glass substrates 1 and 3 has a frit containing an amorphous or crystalline glass powder as a main component. Paste was used.

When the heating temperature in the evacuation step is increased, the fluidity of the amorphous glass increases, and the glass tends to leak. Therefore, the working temperature for sealing (the temperature at which the glass softens and the fluidity increases) and the evacuation step , That is, a temperature difference of several tens of degrees between the solidification temperature (the temperature at which the material does not soften and flow), and the efficiency of these operations decreases. In addition, if the heating temperature in the evacuation step is increased, the working temperature for the above-mentioned sealing is also increased, which causes a problem in performance such as the color temperature of the PDP.

On the other hand, crystalline glass has excellent heat resistance,
The difference between the working temperature for sealing and the heating temperature in the evacuation process may not be small, but the range of temperature conditions is narrow, and there is a problem of defective sealing due to variation in crystallinity.
The present invention has been made in order to solve the above-described problem, and has as its object to provide a plasma display panel in which the reliability of sealing a glass substrate is ensured and the working efficiency is improved.

[0010]

According to the first aspect of the present invention,
In a plasma display panel having a partition wall for partitioning a discharge space in a discharge space formed between the glass substrates, while sealing a peripheral portion of the glass substrate on the opposite display surface side and the back side with a sealing layer, Forming a double sealing layer,
It is characterized in that crystalline glass is used as the inner sealing layer and amorphous glass is used as the outer sealing layer.

[0011]

Since the present invention is constructed as described above, when the glass substrates on the display surface side and the back side are sealed, heat resistance is improved by the first sealing layer using crystalline glass. In addition, the difference between the sealing temperature and the exhaust temperature is reduced, and the influence of the sealing portion defect and the thermal distortion due to the variation in the crystallinity of the first sealing layer using the crystalline glass is reduced. It can be eased by the second sealing layer using. Therefore, PD
The color temperature characteristics of P can be kept good, and work efficiency and sealing reliability can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 illustrates a P according to one embodiment of the present invention.
It is sectional drawing for demonstrating DP. FIG. 2 is a plan view of the glass substrate on the back side in FIG. 1 and 2, the same reference numerals are given to the components corresponding to FIG.

In the figure, 1 is a glass substrate on the display surface side,
Reference numeral 3 denotes a rear glass substrate. On the inner surface of the glass substrate 1 on the display surface side, similarly to the conventional configuration, a pair of row electrodes X and Y for surface discharge in which a transparent electrode and a thick metal electrode for lowering resistance are stacked, and a row electrode A dielectric layer 2 made of low-melting glass for covering X and Y, and a protection layer (not shown) made of a magnesium oxide (MgO) film are formed in this order.

On the other hand, on the inner surface of the glass substrate 3 on the back side,
A column electrode 4 arranged in a direction orthogonal to the row electrodes X and Y;
It is composed of an electrode protection layer 5 covering the column electrode 4 and a low melting point glass provided in a region corresponding to each column electrode 4 on the electrode protection layer 5 so as to partition the discharge space 7 for each unit light emitting region. And a phosphor layer 8 that covers the surface of the electrode protection layer 5 on the column electrodes and the side surfaces of the partition 6.

In the outer non-display region (peripheral portion) of the glass substrate 3, a frame-shaped first sealing layer 12 and a frame-shaped The second sealing layer 13 is provided.

The sealing of the above-mentioned PDP is made by the following steps. First, after the above-described components are provided for each glass substrate, the first and second glass substrates (here, the glass substrate 3 on the rear side) are surrounded by the first and second outer peripheral non-display regions so as to surround the display region 10. The sealing layers 12 and 13 are formed.

The inner first sealing layer 12 is composed of a crystalline glass layer having a softening point lower than that of the low-melting glass layer forming the partition 6, and includes a crystalline glass powder, a binder (resin) and a solvent. Is formed by applying a frit paste mixed with, and performing preliminary firing.

On the other hand, the outer second sealing layer 13 is composed of an amorphous glass layer having a softening point lower than that of the glass layer forming the first sealing layer 12, and is composed of an amorphous glass powder, It is formed by applying a frit paste in which a binder (resin) and a solvent are mixed and performing preliminary firing.

Next, in a state where the two glass substrates 1 and 3 are overlaid and temporarily fixed, a heating and baking treatment is performed at 350 to 450 ° C. for several tens of minutes to several hours, and then the first and second sealings are performed. The layers 12 and 13 are softened and thermally fused to the glass substrates 1 and 3, thereby sealing around the glass substrates 1 and 3.

In this case, the first material using crystalline glass is used.
The sealing layer 12 is positioned on the inner side because it is difficult to soften and flow during heating and firing, and the second layer using amorphous glass is used.
Since the sealing layer 13 of the first sealing layer 12 is positioned outside because it is likely to soften and flow, the heat sealing temperature fluctuates within the set temperature range during the heating and sintering process.
Even if the crystallinity varies from place to place, the second sealing layer 13 provided outside the first sealing layer 12 softens and flows to cover the outer periphery of the first sealing layer 12 in an airtight manner. As a result, the sealing portion is not defective.

Further, during the heating and sintering process, the heat sealing temperature fluctuates to a higher value within the set temperature range and the second sealing layer 13
Is softened and flowed, the first sealing layer 12 formed inside the second sealing layer 13 is excellent in heat resistance, so that it does not soften and flow, and retains its shape, and the two glass substrates 1 and 3 can be sealed.

As described above, the glass substrates 1 and 3 are
First and second sealing layers 12, which are formed doubly through
The surroundings are adhered to each other by 13 and hermetically sealed. As a result, the reliability of sealing the glass substrate is ensured.

Next, while being heated to 350 to 450 ° C., the pre-baking or heat treatment is performed through a sealing hole 15 provided in a non-display area inside the first sealing layer 12 of the rear glass substrate 3. Exhaust treatment of impurity gas such as pyrolysis gas generated by fusion or moisture or carbon dioxide remaining or adsorbed in the first sealing layer 12 and the first sealing layer 13 and sealing rare gas. Do.

The heating temperature at the time of this evacuation process does not need to be greatly reduced as compared with the prior art, and is performed near the working temperature at the above-mentioned pre-baking and heating baking processes. Exhaust can be performed in a shorter time than before. Further, since the first sealing layer 12 is provided so as to surround the display area 10, even if the heating temperature is high during the evacuation process, the second sealing layer 13 that flows and softens flows into the display area 10. Never do. Therefore, the color temperature characteristics of the PDP do not deteriorate, and the reliability of sealing the glass substrate is ensured.

Further, the evacuation process is performed in parallel with the working temperature close to the above-described pre-baking and heating-baking treatments, so that the working efficiency is improved.

[0026]

According to the present invention, the sealing layer is composed of a first sealing layer 12 made of a crystalline glass layer and a second sealing layer made of an amorphous glass layer provided outside thereof. The first sealing layer 12 made of a crystalline glass layer improves heat resistance, reduces the difference between the sealing temperature and the exhaust temperature, Of the first sealing layer 12 made of a non-glass layer can be mitigated by the second sealing layer 13 made of an amorphous glass layer. . As a result, the reliability of the sealing of the glass substrate is ensured. As a result, the color temperature characteristics of the PDP can be kept good, and the working efficiency and the reliability of the sealing can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a surface discharge type PDP according to an embodiment of the present invention.

FIG. 2 is a plan view of the glass substrate on the back side of FIG.

FIG. 3 is a cross-sectional view showing a conventional PDP sealing structure.

[Explanation of symbols]

 1 ... Glass substrate (display surface side) 2 ... Dielectric layer 3 ... Glass substrate (back side) 4 ... Column electrode 5 ... ························································································································································· ... Second sealing layer 15 ... Enclosing holes X, Y ... Row electrodes

Claims (1)

[Claims] 1. A peripheral portion of a glass substrate on a display surface side and a rear surface side facing each other is sealed with a sealing layer, and a partition is provided in a discharge space formed between the glass substrates to partition a discharge space. In the plasma display panel, the sealing layer is formed in a double form, crystalline glass is used as an inner sealing layer, and amorphous glass is used as an outer sealing layer. .