JP2002324491A - Plasma display panel and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel which can raise inert gas purity in the discharge space while maintaining high production efficiency and high shape precision, and to provide a manufacturing method therefor. SOLUTION: A porous layer 6 is formed on the surface of ribs 2 which are formed to segment the discharge space on a substrate 1 into discharge cells. Since the porous layers 6 have a structure more porous than the ribs 2, they absorb more moisture or carbon dioxide than the ribs 2, and do not release impurity gas which the porous layers 6 have once absorbed. As a result, the purity of the inert gas in the plasma display panel is improved as compared with the purity of the inert gas in conventional plasma display panel which does not have porous layers 6.

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 and a method for manufacturing the same, and more particularly to a technique for improving a discharge gas atmosphere in the panel.

[0002]

2. Description of the Related Art A plasma display panel has, for example, a rib-like shape for dividing an airtight space (discharge space) formed between a pair of parallel flat substrates into a plurality of discharge spaces called discharge cells. It is provided with a partition wall and a plurality of discharge electrodes for selectively generating a discharge in a discharge cell, and emits light in a selected predetermined discharge cell using plasma generated by the discharge. so,
Images of desired characters, symbols, figures, etc. are displayed.

In a plasma display panel for color display, R (red), G (green), B
(Blue) and other phosphors corresponding to emission colors,
Light emission of the phosphor excited by ultraviolet light generated by the plasma is used for display. Such a plasma display panel is relatively easy to have a thin large display surface, and has a relatively wide viewing angle and a fast response speed comparable to a cathode ray tube. I have.

As described above, a substrate forming a conventional plasma display panel has a rib-shaped partition partitioning the surface on a surface facing an airtight space. The partition is formed by laminating a thick-film insulating paste, which is a material for forming the partition, on a substrate in a predetermined pattern shape by, for example, a screen printing method, and then firing the substrate.

As the thick film insulating paste, for example,
Suitable fillers (ie, fillers such as alumina, zirconia, lead titanate, barium titanate, etc., or glasses having a high softening point with respect to the firing temperature) are added to an inorganic binder such as a low melting glass. Is used. This filler controls the rheology of the thick film insulating paste to absorb variations in film formation conditions, drying conditions, firing conditions, etc., and to suppress thick film pattern shrinkage due to softening of the inorganic binder during firing. It is added for the purpose of reducing the variation in the deposition change of the partition wall forming material due to firing. As a result, in forming the partition walls, dimensional accuracy for uniform display and cross-sectional shape accuracy for uniform viewing angle can be ensured, and as a result, good display characteristics of the plasma display panel can be obtained.

Further, by increasing the ratio of the filler added to the thick film insulating paste, the firing residual ratio (volume after firing / volume before firing) of the partition walls is increased, and the material efficiency is improved. Further, for example, in the screen printing method, the number of times of printing and lamination can be reduced, so that manufacturing efficiency is improved. This effect is particularly remarkable in the screen printing method, but the manufacturing efficiency is improved in other manufacturing methods.

However, on the other hand, a large number of fine openings are formed in the fired partition wall in proportion to the addition ratio of the filler, that is, the partition wall becomes porous and its surface area increases.

[0008]

In a plasma display panel, an airtight space (discharge space) in the panel is filled with an inert gas for discharge, and if there is an impure gas in the discharge space, the inert gas is discharged. , The emission luminance thereof is reduced. In addition, the electrodes and the phosphor are deteriorated by the impure gas, and the light emission / display quality is deteriorated.

Therefore, it is necessary to minimize the amount of impurity gas in the hermetic space. However, when the partition walls are formed as described above, the binder components (that is, unburned components) in the thick-film insulating paste that have not been decomposed during the firing process are included in the fine openings of the partition walls. And impurities such as moisture and carbon dioxide are easily adsorbed. Then, after the inert gas is filled or the vacuum treatment is performed, when they are separated from the partition walls by a discharge reaction at the time of panel light emission and are released into the discharge space, they become impurity gases.

For this reason, it is necessary to remove these impurity gases by, for example, heating in the process of forming the hermetic space. However, it is difficult to heat the gas to a temperature at which degassing can be sufficiently performed due to restrictions on materials and processes. is there. In addition, it is conceivable that exhaust gas is exhausted by lengthening the exhaust time, but it is obvious that the production efficiency of the product is significantly reduced.

On the other hand, if the partition walls are formed densely, impurities such as moisture and carbon dioxide hardly adsorb to the partition walls.
In addition, the gas contained in the unburned components contained is hardly released into the hermetic space, and the release of the impure gas into the discharge space can be suppressed. It is necessary to use a thick insulating paste having an extremely low thickness. However, this causes a problem that the manufacturing efficiency is reduced and the deformation at the time of firing becomes large, so that high shape accuracy cannot be obtained.

Further, with the recent increase in resolution and definition of plasma display panels, miniaturization of discharge cells has progressed, and the surface area of a substrate forming the panel tends to increase. When the surface area of the substrate is increased, the chances of adsorbing impurities such as carbon dioxide gas and moisture increase, so that the problem becomes more remarkable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a plasma display panel and a plasma display panel capable of increasing the purity of an inert gas in a discharge space while maintaining high production efficiency and shape accuracy. It is intended to provide a manufacturing method.

[0014]

The plasma display panel according to claim 1 has a partition for partitioning a discharge space, and a surface more porous than the partition on the surface of the partition. I do.

According to a second aspect of the present invention, there is provided the plasma display panel according to the first aspect, wherein the layer is formed of fine powder of an inorganic oxide material.

According to a third aspect of the present invention, there is provided a plasma display panel having a partition for partitioning a discharge space, and a surface formed of a fine powder of an inorganic oxide material on a surface of the partition. .

A plasma display panel according to a fourth aspect is the plasma display panel according to the second or third aspect, wherein the inorganic oxide material is A
It is characterized by containing at least one of l ₂ O ₃ , SiO ₂ , TiO ₂ and zeolite (zeolites) as a component.

A method of manufacturing a plasma display panel according to claim 5, wherein a step of preparing a fine powdery inorganic oxide material and a substrate having a partition wall for partitioning a discharge space; A paste, applying the paste of the inorganic oxide material to the partition wall, and drying, and baking the substrate coated with the inorganic oxide material on the partition wall, the partition wall of the On the surface,
Forming a layer more porous than the partition walls.

[0019]

FIG. 1 is a schematic sectional view of a back panel of a plasma display panel according to an embodiment of the present invention. As described above, on the substrate 1, the partition walls 2 for dividing the discharge space into discharge cells and the electrodes 3 for selectively generating discharge in the discharge cells are provided. 4 is, for example, R (red), G (green), B (blue)
And the like corresponding to a predetermined emission color. Reference numeral 5 denotes a white dielectric layer that reflects all visible light wavelengths. The white dielectric layer 5 reflects the light emitted from the phosphor 4 to prevent the light from being absorbed by the substrate 1, thereby improving the display brightness of the plasma display panel. Reference numeral 6 denotes a porous layer formed on the surface of the partition 2 and having a more porous structure than the partition 2.

The porous layer 6 can be realized by baking a paste obtained by mixing a fine powder made of, for example, an inorganic oxide material with a resin such as ethyl cellulose or an organic solvent such as terpineol. As the inorganic oxide material, it is confirmed that fine powder of a material containing Al ₂ O ₃ , SiO ₂ , TiO ₂ , zeolite (zeolites), etc. is relatively easily available and has excellent workability. Have been.

As described above, when the partition walls 2 are formed porous, unburned components are included in the fine openings, and impurities such as moisture and carbon dioxide are easily adsorbed.
Then, after the inert gas is filled or vacuum-treated, they are separated from the partition walls and discharged into the discharge space by, for example, a discharge reaction at the time of panel light emission, resulting in an impure gas.

Here, since the porous layer 6 has a more porous structure than the partition walls 2, impurities such as moisture and carbon dioxide are more likely to be adsorbed than the partition walls 2, and the once adsorbed impurities are desorbed. It has the property of being difficult.

That is, although the impure gas generated in the discharge space is adsorbed to the porous layer 6, the porous layer 6 does not release the once adsorbed impure gas even by, for example, a discharge reaction at the time of panel light emission. Therefore, as a result, the amount of the impurity gas in the discharge space is suppressed, and the purity of the inert gas is improved as compared with the conventional plasma display panel having no porous layer 6. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

By the way, in the configuration of the conventional plasma display panel having no porous layer 6, by making the partition itself more porous than the conventional one, impurities such as moisture and carbon dioxide are adsorbed on the partition itself. It is also conceivable to have a property that it is easy to remove the impurities once adsorbed. However, if the barrier ribs are made more porous than necessary, the mechanical strength of the barrier ribs is reduced, and a problem that pixel defects are likely to occur due to breakage of the barrier ribs occurs. Obviously, the plasma display according to the present invention does not have such a problem.

The effect of improving the purity of the inert gas by the porous layer 6 does not obviously depend on the structure of the partition 2. Therefore, the structure of the partition 2 may be porous as in the prior art. In other words, the dimensional accuracy of the partition wall 2 for increasing the addition ratio of the filler in the thick film insulating paste, which is the material for forming the partition wall 2, for uniform display, and the sectional shape accuracy of the partition wall 2 for uniforming the viewing angle. In the case where the material efficiency is improved by increasing the sintering rate and the firing residual rate, it is possible to suppress a decrease in the purity of the inert gas due to an increase in the surface area of the partition wall 2 accompanying this.

Further, in the present invention, it is not necessary to exhaust and remove the impurity gas in the panel more than the conventional one in order to improve the purity of the inert gas. Therefore, the purity of the inert gas can be improved without prolonging the evacuation time in the panel in the plasma display panel manufacturing process, so that the production efficiency of the product does not decrease.

That is, according to the plasma display panel of the present embodiment, while maintaining high production efficiency and shape accuracy, the discharge of the impurity gas into the discharge space is suppressed and the purity of the inert gas in the discharge space is reduced. Can be improved. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

As a result, the surface of the partition wall 2 is
Therefore, an effect of suppressing breakage of the partition wall 2 such that the top of the partition wall 2 is chipped by contact with the front panel, for example, can be obtained, and can contribute to reduction of pixel defects.

Here, if the volume of the discharge cells becomes too small due to the formation of the porous layer 6 on the surface of the partition walls 2, the brightness of the panel may be reduced.
Therefore, it is desirable that the thickness of the layer formed on the porous layer 6, particularly on the side surface of the partition wall 2, be thin.

The plasma display shown in FIG.
The manufacturing process of the rear panel of the panel will be described. First, many
Fine powder, such as Al, which is a material of the porous layer 6_TwoO_Three, S
iO _Two, TiO_TwoAcid containing zeolite, zeolite, etc.
And a partition wall 2 formed by a predetermined method.
Prepare a substrate that can be used.

Next, a resin and an organic solvent are mixed with the inorganic oxide material to form a paste. Specific examples of the inorganic oxide paste include, for example, Al ₂ O ₃ , SiO ₂ , Ti
An inorganic oxide material containing O ₂ , zeolite (zeolites) or the like, which is pasted as paste viscosity: 30 to 100 Pa · s, solid content ratio of main material: 3 to 60%, resin: ethyl cellulose, solvent: terpineol. Is mentioned. Then, the inorganic oxide paste is applied to the partition walls and dried.

As a method of coating at this time, specifically, for example, a method of screen printing through a screen plate from which an emulsion at a pattern portion is removed can be mentioned. SUS # 4 is an example of a screen version used for screen printing
00, emulsion thickness of 6 to 10 μm.

In this screen printing, the inorganic oxide paste is selectively applied to the partition walls 2 by using a screen plate having a predetermined stripe pattern corresponding to the portion where the inorganic oxide paste is applied. There is a way to do it. However, even in the case of application using a solid printing pattern, selective application is possible by utilizing the shape of the substrate to be applied, the viscosity of the inorganic oxide paste, or the squeegee technique. For example, the inorganic oxide paste discharged between the partition walls by the solid printing pattern flows down along the side surface of the partition wall 2 due to its own weight and its viscosity. It will be selectively applied.

Thereafter, a phosphor paste prepared by mixing a resin material, a solvent, and the like with a phosphor material corresponding to the emission color of R, G, B, or the like is applied to a predetermined location by a method such as a screen printing method. Apply to.

Then, the substrate is heated to, for example, 400 to 450 ° C.
By heating and baking, a porous layer 6 that is more porous than the partition walls 2, for example, about 1.6 to 2 μm is formed on the surface of the partition walls 2.

Through the above steps, the back panel of the plasma display panel shown in FIG. 1 is formed. In this case, the substrate was baked once after applying the inorganic oxide paste and the phosphor paste. For example, the substrate was baked after applying the inorganic oxide paste and after applying the phosphor paste. Changes may be made, such as performing the latter two separate steps.

[0037]

As described above, according to the plasma display panel of the first aspect, the layer on the surface of the partition wall that partitions the discharge space is more porous than the partition wall.
It has the property that impurity gas generated in the discharge space is more easily adsorbed than the partition walls, and it is difficult to remove the impurity gas once adsorbed. Therefore, as a result, the purity of the inert gas in the discharge space is improved as compared with the conventional plasma display panel having no layer. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

Further, since the effect of improving the purity of the inert gas by this layer does not depend on the structure of the partition walls, even if the addition ratio of the filler in the thick film insulating paste which is the material for forming the partition walls is increased, it is not accompanied by the increase. It is possible to suppress a decrease in the purity of the inert gas due to an increase in the surface area of the partition. In other words, while maintaining high manufacturing efficiency and shape accuracy, the panel
Display quality can be improved.

Further, since the purity of the inert gas can be improved without prolonging the evacuation time in the panel,
There is no reduction in product production efficiency.

Further, as a result, since the surface of the partition is protected by the layer, an effect of suppressing breakage of the partition is obtained, which can contribute to a reduction in pixel defects.

According to the plasma display panel of the second aspect, in the plasma display panel of the first aspect, a layer more porous than the partition walls on the partition wall surface is formed.
Since the layer is formed by the fine powder of the inorganic oxide material, the layer has a property that the impurity gas generated in the discharge space is more easily adsorbed than the partition wall, and it is hard to desorb the impurity gas once adsorbed. Therefore, as a result, the purity of the inert gas in the discharge space is improved as compared with the conventional plasma display panel having no layer. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

According to the plasma display panel of the third aspect, the layer on the surface of the partition partitioning the discharge space is:
Since it is formed of a fine powder of an inorganic oxide material, it has a property that the impurity gas generated in the discharge space is more easily adsorbed than the partition walls, and it is difficult to release the once adsorbed impurity gas. Therefore, as a result, the purity of the inert gas in the discharge space is improved as compared with the conventional plasma display panel having no layer. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

According to the plasma display panel of the fourth aspect, in the plasma display panel of the second aspect, the inorganic oxide material is Al ₂ O ₃ , Si
Since at least one of O ₂ , TiO ₂ , and zeolite (zeolites) is contained as a component, the layer has a property that the impurity gas generated in the discharge space is more easily adsorbed than the partition walls, and is further adsorbed once. It is difficult to remove the impure gas. Therefore, as a result, the purity of the inert gas in the discharge space is improved as compared with the conventional plasma display panel having no layer. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

According to the method of manufacturing a plasma display panel of the fifth aspect, a step of preparing a fine powdery inorganic oxide material and a substrate having a partition partitioning a discharge space, Into a paste, applying the paste of inorganic oxide material to the partition walls, and drying, and baking the substrate coated with the inorganic oxide material on the partition walls, the surface of the partition walls, than the partition walls The step of forming a porous layer, the layer formed on the surface of the partition has a property that the impurity gas generated in the discharge space is more easily adsorbed than the partition, and the impurity gas once adsorbed Is difficult to remove. Therefore, as a result, the purity of the inert gas in the discharge space is improved as compared with the conventional plasma display panel having no layer. As a result, the light emission luminance of the panel is improved, and the deterioration of the electrodes and the phosphor due to the impurity gas can be suppressed, so that the light emission and display quality of the panel are improved.

Further, since the effect of this layer on the improvement of the purity of the inert gas does not depend on the structure of the partition walls, even if the addition ratio of the filler in the material for forming the partition walls of the prepared base is high, the surface area of the partition walls is high. , The decrease in the purity of the inert gas due to the expansion of the inert gas can be suppressed. That is, it is possible to improve the light emission and display quality of the panel while maintaining high manufacturing efficiency and shape accuracy.

Further, the purity of the inert gas can be improved without prolonging the evacuation time in the panel.
There is no reduction in product production efficiency.

Further, as a result, the surface of the partition is protected by the layer, so that the effect of suppressing the breakage of the partition can be obtained, which can contribute to the reduction of pixel defects.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a rear panel in a plasma display panel according to an embodiment of the present invention.

[Explanation of symbols]

1 substrate, 2 partition walls, 3 electrodes, 4 phosphors, 5 white dielectric layers, 6 porous layers.

Claims (5)

[Claims] 1. A plasma display panel comprising: a partition partitioning a discharge space; and a surface more porous than the partition on a surface of the partition. 2. The plasma display panel according to claim 1, wherein the layer is formed of fine powder of an inorganic oxide material. 3. A plasma display panel comprising a partition for partitioning a discharge space, and a layer formed of fine powder of an inorganic oxide material on a surface of the partition. 4. The plasma display panel according to claim 2, wherein the inorganic oxide material is at least one of Al ₂ O ₃ , SiO ₂ , TiO ₂ , and zeolite (zeolites). A plasma display panel comprising one as a component. 5. A step of preparing a fine powdery inorganic oxide material and a substrate having a partition for partitioning a discharge space; and forming the inorganic oxide material into a paste; Applying a material material to the partition walls, and drying; baking the substrate with the inorganic oxide material applied to the partition walls to form a layer more porous than the partition walls on the surface of the partition walls. Forming a plasma display panel.