JP2003317621A - Method of manufacturing plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel with decreased degradation of luminous intensity and luminous chromaticity, deterioration of discharge characteristics, and generation of cross talk and panel noise at discharging emission. <P>SOLUTION: This panel is provided with a first step of raising the temperature up to a sealing temperature of higher than the softening point of a sealing member 18 and keeping it at that temperature, a second step of lowering the temperature from the sealing temperature to a given temperature, a third step of holding the given temperature for given period of time and substituting the discharge space with drying gas, and a fourth step of lowering the temperature further down from the given temperature. With this, a plasma display panel without degradation of luminous intensity or degradation of luminous chromaticity, without deterioration of discharge characteristics and without cross talk and panel noise at discharge emission is realized. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a large screen, thin type,
The present invention relates to a plasma display panel known as a lightweight display device.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter referred to as P
In the description of DP), ultraviolet rays are generated by gas discharge,
Color display is performed by exciting the phosphor with this ultraviolet light to cause it to emit light.

The PDP is roughly classified into an AC type and a DC type in terms of driving, and a surface discharge type and a counter discharge type in discharge type. However, high definition, large screen and simple structure are provided. Due to the ease of manufacturing associated with the above, at present, a surface discharge type PDP having a three-electrode structure is the mainstream.

The general structure of this PDP is shown in FIG.
FIG. 3 is a sectional perspective view showing a schematic configuration of the PDP. The front plate 1 is a transparent and insulating substrate 2 such as glass.
This is a structure in which a plurality of display electrodes 5 covered with a dielectric layer 3 and a protective film 4 made of a MgO vapor deposition film are additionally provided. The display electrode 5 is a pair of the scan electrode 6a and the sustain electrode 6b.

The rear plate 7 is provided with a plurality of data electrodes 10 covered with an insulating layer 9 on an insulating substrate 8 such as glass, and between the data electrodes 10 on the insulating layer 9. Are stripe-shaped partition walls 11 parallel to the data electrodes 10.
Is provided, and the phosphor layer 12 is provided on the surface of the insulator layer 9 and the side surface of the partition wall 11.

The front plate 1 and the rear plate 7 have a discharge space 13 so that the display electrodes 5 and the data electrodes 10 are orthogonal to each other.
The seal members (not shown) are arranged to face each other with the seal sandwiched therebetween, and are adhered in an airtight state by a seal member (not shown) formed on the peripheral portion of at least one of the front plate 1 and the rear plate 7.
In the discharge space 13, helium as a discharge gas,
At least one gas selected from neon, argon, and xenon is enclosed, sandwiched between two partition walls 11, and the discharge space 1 at the intersection of the data electrode 10 and the display electrode 5.
3 operates as the discharge cell 14.

Here, the phosphor layer 12 is provided with three color phosphor layers of red, green and blue in order between the partitions 11 for color display. The phosphor layer 12 is excited to emit light by vacuum ultraviolet rays (wavelength 147 nm) having a short wavelength generated by discharge. The following materials are generally used as the phosphor forming the phosphor layer 12. “Blue phosphor”: BaMgAl ₁₀ O ₁₇ : Eu “Green phosphor”: Zn ₂ SiO ₄ : Mn or BaAl ₁₂
O ₁₉ : Mn “red phosphor”: Y ₂ O ₃ : Eu or (Y _x Gd _1-x ) B
O ₃ : Eu And, in the PDP having the above-mentioned structure, the front plate 1 and the rear plate 7 are bonded in an airtight state by sealing at least one of the substrate 2 of the front plate 1 and the substrate 8 of the rear plate 7. After forming the members, they are superposed, and in this state, the sealing member is heated to a sealing temperature equal to or higher than the softening point temperature to bring the sealing member into a molten state, and then the temperature is lowered to solidify the sealing member. It is realized by the process.

In addition, when charging the discharge gas into the PDP,
H that adversely affects the discharge characteristics ₂O and CO₂Such as
Pure gas or CH-based impurities from the discharge space 13 in the PDP
Do not heat the PDP from the viewpoint that it will be performed after discharging.
Exhaust baking inside the PDP, so-called exhaust baking
And then discharge gas is filled inside the PDP.
It is carried out by the procedure.

[0009]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the PDP manufacturing method, after the PDP is completed, blue fluorescence is generated.
There is a problem in the body that the emission intensity decreases and the emission chromaticity deteriorates.
Seen inside the PDP during the sealing process during PDP manufacturing.
Moisture generated in the blue fluorescent material adversely affects the blue phosphor material.
It is thought that the cause is that the optical material is altered
Be done. In addition, the discharge characteristics after completion of the PDP
There is also a problem of deterioration over time, which is
In the air baking process, the discharge space 13 in the PDP
Residual H ₂O and CO₂Emission of impurity gas such as the same
Combustion of CH-based impurities remaining in the discharge space of the PDP
However, it is thought that it is due to insufficient
Be done.

Therefore, in order to solve these problems,
By sealing the discharge space 13 in the PDP while substituting it with a dry gas, the discharge space 13 after sealing has a state of
There is a sealing step of realizing a state in which the impurity gas and CH-based impurities are removed.

However, if the dry gas is replaced in the PDP at the time of sealing, the pressure between the introduction part for introducing the dry gas and the discharge part for discharging the introduced dry gas is changed in the PDP. In addition, since the sealing member is in a softened state during sealing, the state of the PDP after sealing is such that the distance between the front plate 1 and the rear plate 7 becomes uneven depending on the location. There are cases. The unevenness of the distance between the front plate 1 and the rear plate 7 is caused by the partition wall 11
It is considered that this is caused by non-uniformity of the contact state such as a gap between the substrate 2 and the substrate 2, and crosstalk during discharge light emission and collision between the partition wall 11 of the front plate 1 and the rear plate 7 during driving. It may cause noise (hereinafter referred to as panel noise).

The present invention has been made in view of such a situation, and there is no reduction in emission intensity, deterioration in emission chromaticity, deterioration in discharge characteristics, and crosstalk and panel noise during discharge emission. It is intended to realize a plasma display panel that does not have a plasma display panel.

[0013]

In order to achieve the above object, a method of manufacturing a plasma display panel according to the present invention includes a front plate and a rear plate that are opposed to each other so that a discharge space is formed therebetween. A method of manufacturing a plasma display panel having a sealing step of sealing with a sealing member formed in a portion, wherein the sealing step is performed after raising a sealing temperature equal to or higher than a softening point temperature of the sealing member, A first step of holding the temperature, a second step of lowering the sealing temperature to a predetermined temperature thereafter, and a third step of holding the predetermined temperature for a predetermined period and replacing the discharge space with a dry gas. And the fourth step of further lowering the temperature from the predetermined temperature.

Further, in order to achieve the above object, in the method of manufacturing a plasma display panel of the present invention, a front plate and a rear plate which are opposed to each other so as to form a discharge space are formed in the peripheral portion thereof. A method of manufacturing a plasma display panel, comprising a sealing step of sealing with a sealing member, wherein the sealing step raises the sealing temperature to a softening point temperature of the sealing member or higher and then holds the temperature. It comprises a first step, then a second step of lowering the temperature from the sealing temperature to a predetermined temperature, and then a third step of continuing the temperature reduction and replacing the discharge space with a dry gas.

According to the above, it is possible to realize a plasma display panel in which the emission intensity is not reduced, the emission chromaticity is deteriorated, the discharge characteristics are not deteriorated, and there is no crosstalk or panel noise during discharge light emission.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A method of manufacturing a plasma display panel and a recording medium according to an embodiment of the present invention will be described below, but the embodiment of the present invention is not limited thereto. The structure of the PDP manufactured according to the present embodiment is the same as that shown in FIG. 3, and the same parts are given the same numbers in the following description.

FIG. 1 is a cross-sectional view showing a schematic structure of a sealing apparatus for carrying out the sealing step included in the method for manufacturing a PDP according to this embodiment, showing a state in which the PDP is installed. However, the PDP portion in FIG. 1 shows only the portion relating to the sealing step, and the partition walls 11 and electrodes inside the PDP are omitted. Further, FIG. 2 is a diagram showing a temperature pattern in the sealing step in the method for manufacturing a PDP according to the present embodiment.

The sealing device has a heating furnace 15, an exhaust device 16 and a dry gas introducing device 17. Then, the substrate 2 of the front plate 1 and the substrate 8 of the back plate 7 are temporarily fixed to the sealing device, for example, with a clip (not shown) or the like in a state where they face each other with the seal member 18 provided in the peripheral portion interposed therebetween. Have been installed. The substrate 8 also has holes 19a and 19a.
b is formed, tubes 20a and 20b made of, for example, a glass material are arranged in a state where they can be electrically connected to the discharge space in the PDP through the holes 19a and 19b, and a sealing member 18 is formed so as to cover the arrangement position. In this state, the tubes 20a and 20b are temporarily fixed by, for example, a clip (not shown). The pipes 20a and 20b are connected to the exhaust device 16 and the dry gas introducing device 17, respectively. Here, as the seal member 18, for example, a low melting point glass having a softening point temperature of 420 ° C. is used.

Next, the substrate 2 and the substrate 8 are again connected to each other.
A sealing step for sealing the tubes 20a and 20b with each other will be described.

First, as the first step, the sealing temperature of the sealing member 18 is raised to 420 ° C., for example, 480 ° C. in the heating furnace 15, and the temperature is maintained for 10 minutes. By this first step, the sealing member 18
Is in a sufficiently molten state.

Then, as a second step, the sealing temperature is lowered from 480 ° C. to a predetermined temperature. Here, the predetermined temperature is, eg, 450 ° C.

Then, as a third step, the discharge space 13 is replaced with a dry gas while being kept at a predetermined temperature of 450 ° C. for a predetermined period of time, for example, 30 minutes. Specifically, for example, by the dry gas introduction device 17, the pipe 20b
And, the dry gas is introduced into the discharge space 13 in the PDP through the holes 19b, and is exhausted by the exhaust device 16 through the tube 20a and the hole 19a, and the introduction and the exhaust are performed at least once. By this third step, the impurity gas released from the front plate 1 and the rear plate 7 at the time of sealing is replaced with the dry gas, and
Since incomplete combustion is eliminated, CH-based impurities are also removed. As a result, it is possible to reduce the problem that the blue phosphor is deteriorated during sealing and the problem that the discharge characteristics are deteriorated with time after completion of the PDP. further,
In this step, the predetermined temperature at which the introduction of the dry gas is started is 450 ° C., which is lower than the sealing temperature 480 ° C., and the sealing member 18 is in a softened state having a higher viscosity than the softened state at the sealing temperature. Therefore, even if a pressure distribution occurs in the PDP due to the introduction and exhaust of the dry gas, nonuniformity does not occur in the distance between the front plate 1 and the rear plate 7. Therefore, crosstalk does not occur during discharge light emission, and panel noise does not occur during driving.

Finally, as a fourth step, the temperature is further lowered from a predetermined temperature to complete the sealing process.

As described above, according to the above-mentioned sealing step, the introduction and discharge of the dry gas into the discharge space 13 in the panel are repeated after the temperature becomes lower than the sealing temperature. Even if the pressure in the PDP is distributed, sealing is performed stably, and in the completed PDP, the distance between the front plate and the back plate is uniform over the entire panel.

As a result, it is possible to realize a plasma display panel in which the emission intensity is not reduced, the emission chromaticity is not deteriorated, and the discharge characteristics are not deteriorated, and there is no crosstalk or panel noise during discharge light emission.

Here, Ba is often used in PDPs.
MgAl ₁₀ O ₁₇ : Eu, Zn ₂ SiO ₄ : Mn and (Y, G
d) BO ₃ : Eu oxide-based phosphors such as Eu, and MgO used as a protective film form oxygen defects when heated in an oxygen-free atmosphere, resulting in reduced luminous efficiency and discharge instability. May cause. Also, C in the panel
In order to sufficiently burn and remove the H-based impurities, the dry gas used in the above-mentioned sealing step preferably contains at least oxygen, and for example, dry air or dry oxygen gas is preferably used.

Further, as the water vapor partial pressure of the dry gas, the lower the water vapor partial pressure, the more the deterioration of the blue phosphor is suppressed.

If the softening point temperature is set as the predetermined temperature at which the introduction and discharge of the dry gas is started, the viscosity of the seal member 18 in the molten state is further increased, and the effect of further suppressing the sealing failure is further increased, which is preferable.

Further, as a specific method for replacing the discharge space 13 with the dry gas, other than the mode of introducing and discharging the dry gas at least once as described above, the discharge space 13 can be replaced with the dry space. To discharge while introducing the dry gas, specifically, one of the pipes 20a and 20b, for example, the pipe 20a is opened without connecting anything, and the dry gas introducing device 17 is provided through the other pipe 20b.
The dry gas is introduced into the discharge space 13 in the panel by the above, and is naturally discharged from the tube 20a without being forcibly discharged by the exhaust device 16, or the hole is formed in the substrate 8 of the rear plate 7. It is also possible to obtain the same effect in a structure in which one and two tubes are provided and the introduction and discharge of the dry gas to and from the discharge space 13 is repeated through the tube and the hole.

Also in the fourth step, the PDP
It is preferable to replace the discharge space 13 in the discharge space 13 with a dry gas because the effect of removing impure gas and impurities in the discharge space 13 is further increased. Here, the specific mode of the substitution is as described above.

Further, the sealing temperature is preferably about 60 ° C. to 70 ° C. higher than the softening point temperature of the seal member in order to obtain a good melting state of the seal member 18, but it is 5 ° C.
If the temperature is higher than 00 ° C, problems such as heat damage to the components of the PDP may occur.
It is preferable that the temperature is not higher than 0 ° C.
It is preferable to select and use the seal member 18 having a softening point temperature that provides a sealing temperature of 0 ° C. or less.

In the above example, the sealing temperature is 480 ° C.
And the predetermined temperature is 450 ° C., and at that temperature for a predetermined period,
Although the case of holding is shown as an example, the present invention is not limited to this, and as a result of our study, in order to ensure the sealing stability, the predetermined temperature is at least 1 temperature higher than the sealing temperature.
It has been confirmed that the temperature should be 0 ° C. or more lower. If the temperature difference is less than that, the viscosity of the seal member will be close to the viscosity at the sealing temperature. Therefore, when the dry gas is introduced or the dry gas is repeatedly introduced and discharged, the pressure in the PDP is reduced. May occur and the sealing uniformity may not be maintained.

In addition, as a result of our study, we repeated the introduction and discharge of the dry gas into the discharge space 13 at 400 ° C.
It has been confirmed that the above-described state is preferable in order to sufficiently obtain the effect of removing the CH-based impurities in the discharge space 13. At a temperature lower than that, for example, even if a dry gas is flown, the CH-based impurities may not be burned and may remain in the panel, and a sufficient effect cannot be obtained. Also, 4
If the temperature is 00 ° C. or higher, the higher the temperature, the higher the effect.

Therefore, from the above, it is preferable that the predetermined temperature is 490 ° C. or lower and 400 ° C. or higher.

Further, in the present embodiment, an example is shown in which the predetermined temperature is maintained for a predetermined period and the introduction and discharge of the dry gas to and from the discharge space 13 is repeated, but the predetermined temperature is maintained for a predetermined time. The same effect can be obtained by replacing the discharge space 13 with a dry gas after the temperature has been decreased to a predetermined temperature without performing the operation. In this case, the sealing step can be shortened and the productivity is improved, but since the introduction and discharge of the dry gas are repeated at a low temperature, the obtained effect is slightly reduced. It may end up.

Further, in the sealing step in the present embodiment, it is necessary to combine a temperature pattern such as temperature rising, temperature lowering, temperature holding, etc. and introduction and discharge of the dry gas, and the timing thereof is important. Therefore, as a sealing device for performing such a sealing process, it is preferable that each step of the sealing process can be sequentially and automatically executed. This is because, for example, the sealing device has a control unit that controls the operations of the heating furnace 15, the exhaust device 16, and the dry gas introduction device 17, and this control unit executes each step of the sealing process as described above. This can be realized by a device configuration in which the operations of the heating furnace 15, the exhaust device 16, and the dry gas introduction device 17 are controlled so as to do so.

[0037]

As described above, according to the present invention, there is no reduction in emission intensity, deterioration in emission chromaticity, and deterioration in discharge characteristics, and there is no crosstalk or panel noise during discharge emission. A display panel can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a sealing device for performing a sealing step in a method of manufacturing a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a diagram showing a temperature pattern in a sealing step in a method of manufacturing a plasma display panel according to an embodiment of the present invention.

FIG. 3 is a cross-sectional perspective view showing a schematic configuration of a general plasma display panel.

[Explanation of symbols]

1 Front plate 2 substrates 7 Back plate 8 substrates 13 discharge space 18 Seal member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuyoshi Nishinaka             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masafumi Okawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Kazuya Hasegawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5C012 AA09 BC03                 5C040 FA01 GB03 GB14 HA01 MA10

Claims (8)

[Claims] 1. A method of manufacturing a plasma display panel, comprising a sealing step of sealing a front plate and a rear plate facing each other so that a discharge space is formed between them by a seal member formed in the peripheral portion thereof. In the sealing step, the first step is to raise the sealing temperature to the softening point temperature of the seal member or higher, and then to maintain the temperature, and then to lower the sealing temperature to a predetermined temperature. A plasma display panel comprising the step 2), then the third step of maintaining the predetermined temperature for a predetermined period and replacing the discharge space with a dry gas, and then the fourth step of further lowering the temperature from the predetermined temperature. Manufacturing method. 2. A method of manufacturing a plasma display panel, comprising a sealing step of sealing a front plate and a rear plate facing each other so as to form a discharge space therebetween by a seal member formed in the peripheral portion. In the sealing step, the first step is to raise the sealing temperature to the softening point temperature of the seal member or higher, and then to maintain the temperature, and then to lower the sealing temperature to a predetermined temperature. A method of manufacturing a plasma display panel, comprising the step 2 and a third step of continuing the temperature reduction and replacing the discharge space with a dry gas. 3. The plasma display panel according to claim 1, wherein the replacement of the discharge space with the dry gas in the third step is an operation of introducing and discharging the dry gas into and from the discharge space at least once. Manufacturing method. 4. The method for manufacturing a plasma display panel according to claim 1, wherein the replacement of the discharge space with the dry gas in the third step is an operation of discharging the dry gas while introducing the dry gas into the discharge space. 5. The method of manufacturing a plasma display panel according to claim 1, wherein in the fourth step, the discharge space is replaced with a dry gas. 6. The method for manufacturing a plasma display panel according to claim 1, wherein the sealing temperature is 410 ° C. or higher and 500 ° C. or lower, and the predetermined temperature is 490 ° C. or lower and 400 ° C. or higher. . 7. The dry gas comprises oxygen.
A method for manufacturing a plasma display panel according to any one of 1. 8. The method of manufacturing a plasma display panel according to claim 7, wherein the dry gas is dry air.