JPH10326572A - Manufacture of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a plasma display panel in which the pressure of internal discharge gas is constant. SOLUTION: A plasma display is manufactured in such a way that a plasma display panel assembly T comprising a front glass substrate 1 and a back glass substrate 3 is placed in a sealed space, the space is evacuated in vacuum, discharge gas is supplied to the space, then the plasma display assembly T is sealed. In this manufacturing process, a ventilation hole 2 is formed in one of the glass substrates, the plasma display panel assembly T is sealed, then the ventilation hole is sealed with a sealing glass plate 8.

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 (hereinafter, referred to as PDP).

[0002]

2. Description of the Related Art Various methods have been proposed for manufacturing a PDP. One of the methods is as shown in FIGS. 6 and 7, where a front glass substrate 1 and a rear glass substrate 2 are opposed to each other. , An electrode (not shown) and a partition wall 2a, and a sealing material 4a such as a low-melting glass or the like, which is made of, for example, low melting point glass, is provided on the outer peripheral portion of the opposite surface of the rear glass substrate 2 by using a dispenser or the like. After coating, a sealing material for spacers 4b is provided thereon at a predetermined interval and then dried, and the rear glass substrate 2 and the front glass substrate 1 are fixed with clamps 5 to form a PDP assembly T. And this P
By loading the DP assembly T into a closed furnace and heating it to 300 to 400 ° C. and evacuating the furnace, the two glass substrates 1 and 2 are simultaneously degassed. In this case, the heating rate of the furnace is 3 to 15 ° C./min, and the exhaust is about 10 ⁻⁶ to 10 ⁻⁷ Torr. When the inside of the furnace is exhausted to a predetermined degree of vacuum and the degassing from the glass substrates 1 and 2 is completed as described above, a discharge gas such as a neon gas is supplied into the furnace (for example, the desired sealed gas The amount needed to obtain pressure)
A discharge gas is introduced between the glass substrates. Thereafter, the furnace temperature is further increased to 400 to 5 which is the softening temperature of the sealing materials 4a and 4b.
By raising the temperature to 00 ° C. to soften the sealing material, sealing and sealing the discharge gas in both glass substrates 1 and 2,
PDP.

[0003]

When a PDP is manufactured by the above method, the gas pressure of the discharge gas in the PDP is ± 1.
It was found that there was variation of 0% or more, which caused various problems. Then, the present inventors examined the cause and found that it was due to the following reason. That is, since the inside and outside of the glass substrates 1 and 2 are in communication with each other by the spacer sealing material 4b provided at the outer edge thereof, the sealing materials 4a and 4b soften as the temperature in the furnace increases, and the sealing is performed. The pressures inside and outside the PDP at the moment when the members 4a and 4b seal the opposing outer edges of the glass substrates 1 and 2 are the same. The gap D between the two glass substrates 1 and 2 at this time is
It is determined by the application state of b. Thereafter, when the temperature in the furnace is further increased, the softening of the sealing materials 4a and 4b further progresses, and the two glass substrates 1 and 2 are sealed by the pressing force of the clamp 5 so that the gap between the two glass substrates 1 and 2 is reduced. The distance becomes an expected gap d (the thickness of the sealing material 4 at the time of completing the sealing). That is, as described above, after the outer edges of both glass substrates 1 and 2 are sealed, the gap decreases to a predetermined value (D
→ d) Therefore, the filling gas pressure P ₁ ′ in the PDP is P ₁ × D × S = S, where S is the area within the outer edges of both glass substrates 1 and 2 and P ₁ is the furnace pressure when discharge gas supply is completed. P ₁ ′ × d × S
∴P ₁ ′ = P ₁ (D / d). Where D = 2
If 00 μ, d = 150 μ, and P ₁ = 500 Torr, P ₁ ′ = 667 Torr, and the pressure of the gas sealed in the PDP changes greatly.

The sealing materials 4a and 4b are formed by a dispenser or the like as described above, but it is impossible to make the amounts and shapes completely identical. The gap D at the moment of stopping cannot be accurately controlled. For this reason, the pressing amount from the start of sealing the glass substrates 1 and 2 with the sealing materials 4a and 4b is not constant, so that a gas pressure appropriate for the pressing amount is introduced in advance to the PDP.
It has been found that this is due to the fact that the sealed gas pressure cannot be kept constant. Accordingly, it is a first object of the present invention to provide a method of manufacturing a PDP capable of always keeping the gas pressure of the discharge gas in the PDP constant irrespective of the state of formation of the sealing material. It is a second object of the present invention to provide a method of manufacturing a gettered PDP for activating a getter material when implementing the above method.

[0005]

According to the present invention, in order to achieve the above object, a plasma display panel assembly comprising a front glass substrate and a rear glass substrate is located in a closed space, and the space is evacuated. Thereafter, a discharge gas is supplied to the space, and then the plasma display panel assembly is sealed. In the method for manufacturing a plasma display panel, a plasma display panel assembly is provided using one of the glass substrates provided with a vent hole. After sealing the three-dimensional object, the air hole is sealed. Also,
After the getter material is positioned and sealed in the plasma display panel assembly through the air hole, the air hole is sealed.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. In the first embodiment of the present invention, the front glass substrate 1 or the rear glass substrate 2
Using a glass substrate provided with a vent hole 3 on one of the glass substrates, sealing the PDP assembly T composed of the two glass substrates 1 and 2, and then sealing the vent hole 3 It is.

That is, as shown in FIG.
An air hole 3 is provided slightly inside the sealing material application portion of the rear glass substrate 2, and a final sealing material 6 made of low melting glass is positioned so as to surround the air hole 3. This final sealing material 6 is made of a material having a higher softening point than the sealing and space sealing materials 4a and 4b.
As shown in (A) and (B), it has a C shape or a ring shape in which a groove is formed in a side wall, and the former opening and the latter groove are gas flow holes 7. The front glass substrate 1 and the rear glass substrate 2 are coated with sealing and space sealing materials 4a and 4b on the outer edge of the rear glass substrate 2 and dried and calcined. To the PDP assembly T. This PDP assembly T
Inside and outside are in communication. The sealing materials 4a and 4b for sealing and space are, for example, LS-0118 (softening point: 390 ° C., manufactured by NEC Corporation), and the final sealing material 6 is, for example, LS-0206 (softening point, manufactured by Nippon Glass). 410 ° C or the like can be used.

Next, a sealing glass plate 8 is placed on the final sealing material 6 and an assembling jig 9 made of stainless steel or the like is placed on the back glass substrate 2. The seal glass plate 8 is brought into pressure contact with the final sealing material 6 by a spring 11 interposed therebetween. Then, the two glass substrates 1 and 2 are simultaneously degassed by being charged into a closed furnace and heated to 340 to 370 ° C. and evacuated according to the heat curve of FIG. In this case, the heating rate of the furnace is about 3 ° C./min, and the exhaust rate is 10
^{About -6} to 10 ^-7 Torr. And said 340
The glass substrates 1 and 2 are surely degassed by heating at 370 ° C. for a certain time. As described above, when the inside of the furnace is set to a predetermined vacuum degree and the inside of the furnace and the degassing from both glass substrates 1 and 2 are completed, the inside of the furnace is heated to 410 to 470 ° C again.

On the other hand, a discharge gas such as a neon gas is supplied into the furnace space in the latter half of the soaking (at the completion of degassing).
Introduce. Since this discharge gas is heated and has a high temperature, it is necessary to maintain a predetermined pressure at normal temperature of the PDP.
For example, at 450 ° C., the pressure needs to be about 2.4 times the predetermined pressure (normal gas pressure of the discharge gas) at normal temperature.

By the way, the sealing materials 4a and 4b start to soften at a point A in FIG. 3 and the outer edges of both glass substrates 1 and 2 are sealed. At this moment, the pressure P in both glass substrates 1 and 2
₁ and the furnace pressure P ₂ are the same (P ₁ = P ₂ ). After that, the sealing materials 4a and 4b are further softened by the rise in the furnace temperature, and are pressed by the clamp 5 so that the gap between the glass substrates 1 and 2 is reduced at the point B (from D to d).
At this time, the final sealing material 6 has a softening point of the sealing materials 4a, 4b.
Since it is in a non-softened state because it is higher, even if the gap between the two glass substrates 1 and 2 decreases from D to d and the internal pressure between the two glass substrates 1 and 2 becomes large, the final sealing material 6 The pressure between the glass substrates 1 and 2 escapes from the gas flow hole 7 and the ventilation hole 10 of the assembling jig 9 into the furnace and is maintained at the same pressure (P _1).
= P _2).

Then, at point C, the final sealing material 6
Is softened, and the sealing glass plate 8 seals the ventilation hole 3 with the pressing force of the spring 11. In this case as well, since the final sealing material 6 is softened and closed after closing the gas flow holes 7, it is further softened and pressed, so that the pressure in the glass substrates 1 and 2 is slightly increased. The change is very small and can be ignored in the whole. That is,
The discharge gas is sealed between the two glass substrates 1 and ₂ in substantially the same state as the furnace pressure P2. When the discharge gas is sealed between the glass substrates 1 and 2 as described above, a predetermined PDP is obtained by cooling at a cooling rate of about 3.5 ° C./min.

The above gas introduction example is an example in which the luminescent gas is introduced after degassing and soaking at 340 to 370 ° C., but the following method may be adopted. After vacuum degassing at 340-370 ° C,
The furnace is heated while vacuum evacuation is continued, and discharge gas is introduced into the closed furnace within a temperature range of the softening start temperature A of the substrate sealing materials 4a and 4b and the sealing temperature C of the final sealing material 6. In this method, the discharge gas introduced into the furnace enters the PDP through the ventilation holes 10 of the assembling jig 9 and the gas flow holes 7 of the final sealing material 6.

It is desirable that the gas (discharge gas) filled in the PDP has as few impurities (N ₂ , O ₂ , H ₂ , CO, CO _2, etc.) as possible. For this reason, as shown in FIG.
There is a method of removing the impurities by providing a getter material in the PDP. In this case, the ventilation hole 3 can be used as a part of the getter room, and the sealing temperature of the sealing materials 4 a and 4 b can be used as the activation processing temperature of the getter material 12. That is, in the process of forming the PDP assembly T, a getter material (for example, Pt707 manufactured by SAES Getters Japan KK) having an activation temperature of 400 to 500
C) 12 is located in the air hole 3 provided in the rear glass substrate 2 to form the PDP assembly T, and if the sealing process is performed by the above-described heat curve, the final sealing temperature (41)
0-470 ° C.), the getter 12 is activated,
Impurity gas in the discharge gas in the PDP will be adsorbed. As shown in FIG. 5, the final sealing material 6 includes a sealing sealing material 6a and a space sealing material 6b.

The two glass substrates 1 in the PDP assembly T
The formation of the gap 2 is not limited to the above-described embodiment, and another method may be adopted as long as the gap is substantially formed.

[0015]

As is apparent from the above description, claim 1
According to the invention, a plasma display panel assembly including a front glass substrate and a rear glass substrate is positioned in a closed space, and after evacuating the space, supplying a discharge gas to the space, and thereafter, the plasma display In a method of manufacturing a plasma display panel for sealing a panel assembly, the plasma display panel assembly is sealed using one of the glass substrates provided with a vent, and then the vent is sealed. Because
That is, since the air holes are sealed after both glass substrates are completely sealed, the discharge gas pressure in the PDP can be controlled by the discharge gas pressure supplied into the furnace, and the discharge gas pressure is substantially uniform. It can be a PDP. According to the second aspect of the present invention, the getter material is positioned in the plasma display panel assembly via the air hole and sealed, and then the air hole is sealed. In addition to this, there is an effect that the sealing temperature of the ventilation hole can be used as the activation temperature of the getter.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an assembly applied to manufacture of a plasma display panel according to the present invention.

FIGS. 2A and 2B are perspective views of a final sealing material.

FIG. 3 is a heat curve.

FIG. 4 is a sectional view of another assembly.

FIG. 5 is a VV plan view of FIG. 4;

FIGS. 6A and 6B are diagrams showing a method of applying a sealing material onto a glass substrate.

FIG. 7 is a partial cross-sectional view of an assembly applied to manufacture a conventional plasma display panel, in which the left half shows after sealing and the right half shows before sealing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front glass substrate, 2 ... Back glass substrate, 3 ... Vent hole, 4a, 4b ... Sealing material, 5 ... Clip metal fitting, 6 ... Final sealing material, 8 ... Seal glass plate, T ... Plasma display panel assembly .

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J 17/22 H01J 17/22

Claims (2)

[Claims] 1. A plasma display panel assembly comprising a front glass substrate and a rear glass substrate is located in a closed space, and after evacuating the space, supplying a discharge gas to the space. A method for manufacturing a plasma display panel for sealing an assembly, comprising: sealing a plasma display panel assembly using a glass substrate provided with a vent on one side thereof; and sealing the vent. A method for manufacturing a plasma display panel. 2. The plasma display panel according to claim 1, wherein the getter material is positioned in the plasma display panel assembly via the air hole and sealed, and then the air hole is sealed. Manufacturing method.