JP2004179170A - Manufacturing method of ac type plasma display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alternating current type plasma display in which a protective layer has superior membrane characteristics such as membrane strength, adhesiveness, transparency, and protective action, and furthermore in which reduction of a discharge start voltage and a drive power voltage (power consumption) are achieved in the case of using the membrane. <P>SOLUTION: In a manufacturing method of this alternating current type plasma display, opposite arrangement of a rear face substrate and a front face substrate is carried out by having a gas discharge space in between, a mutually paired electrodes covered by a dielectric layer are formed at one substrate or both substrates, and the protective layer is formed on the dielectric layer. In the protective layer, a sol solution in which aggregates of magnesium hydroxide particulates are dispersed in an organic solvent containing at least one kind of hydroxyl group containing organic compound is coated on the dielectric layer, dried and calcined. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a method for manufacturing an AC plasma display, and more particularly to a technique for forming a protective layer formed on a surface of a dielectric layer.

  In recent years, research and development of flat panel displays replacing CRTs have been actively conducted. Among them, the so-called plasma display, which utilizes the light emission phenomenon accompanying the discharge for the display, is a direct current type in which the metal electrode is exposed in the discharge space due to the structure of the electrode (mainly ITO), and the metal electrode is a dielectric layer. The AC type plasma display is roughly divided into the AC type that is covered, and the latter type of AC type plasma display has started to be partially commercialized by using both a thin film process using a vacuum system and a thick film process using a screen printing method. .

  When this plasma display is used for a large-screen color television, it is necessary to have a memory function in order to achieve high luminance. In that respect, an AC type plasma display is used as a protective layer on a dielectric layer. It is considered to be a method that can cope with an increase in size because it has a memory function inherently due to the accumulated charges. As a material for the protective layer, magnesium oxide having high secondary electron emission efficiency and excellent sputter resistance is used. At present, a life of 15,000 hours has been achieved in a full-color AC plasma display, 21-inch panels have become commercially available.

As a method for forming the protective layer, there are EB evaporation method, sputtering method, CVD method and the like as a thin film method (Patent Document 1 and Patent Document 2), and as a thick film method, a basic magnesium carbonate as a magnesium oxide raw material is spray-coated. A method of forming a thick film on a substrate by a method and firing it to obtain a metal oxide (Patent Document 3), or dispersing a magnesium oxide fine powder in a liquid binder that becomes an oxide after firing, and forming a magnesium oxide-containing film. (Patent Document 4) was also considered.
Japanese Patent Publication No. 60-42579 JP-B-63-59221 Japanese Patent Publication No. 57-13983 Japanese Patent Publication No. 6-283020

  Among the above methods, methods using a vacuum process such as the EB vapor deposition method, the sputtering method, and the CVD method are difficult to accommodate a large panel substrate such as a plasma display in a vacuum chamber. Assuming that there was a problem in terms of equipment costs and productivity.

  Further, the thick film method has been intensively studied because it is a simple method, but has not yet achieved satisfactory performance. The reason is that commercially available magnesium oxide fine particles have high cohesiveness, are difficult to disperse in an organic solvent, and cannot provide a protective layer with high uniformity. The magnesium oxide film is insufficient in film strength, adhesion, transparency, and the like, and the film cracks when the film is fired. Therefore, when such a protective layer is used, the function as the protective film of the original dielectric layer cannot be sufficiently exhibited.

In addition, since the particle diameter of the magnesium oxide fine particles dispersed in the paste itself is large and the viscosity of the paste itself is large, it is difficult to make the protective layer thinner, and accordingly, the discharge starting voltage and the driving voltage are reduced. Has not been achieved sufficiently.
The present invention has been made in view of the above circumstances, and solves the above-mentioned disadvantages of the prior art, and requires a large-area panel without requiring expensive equipment as seen in a vacuum process. The film has excellent film properties such as film strength, adhesion, transparency, and protective action. Further, when the film is used, a discharge starting voltage or a driving voltage ( It is an object of the present invention to provide a method of manufacturing an AC plasma display in which power consumption is reduced.

  The above object is achieved by the present invention described below. That is, in the present invention, the rear substrate and the front substrate are arranged to face each other with the gas discharge space interposed therebetween, and one or both substrates are provided with electrodes that are paired with each other and are covered with a dielectric layer. In the method for producing an AC type plasma display in which a protective layer is formed on a body layer, the protective layer is formed by dispersing an aggregate of magnesium hydroxide fine particles in an organic solvent containing at least one hydroxyl group-containing organic compound. A method for manufacturing an AC type plasma display, comprising applying a solution on the dielectric layer, drying and baking the solution.

  According to the present invention, by forming the protective layer in the AC type plasma display from magnesium oxide fine particles having a specific particle size, a large-area panel can be formed without requiring expensive equipment as seen in a vacuum system process. The film has excellent film properties such as film strength, adhesion, transparency, and protective action. Further, when the film is used, the discharge starting voltage and the driving voltage (consumption) The present invention provides an AC type plasma display in which power consumption is reduced.

Next, the present invention will be described in more detail with reference to embodiments shown in the drawings.
FIG. 1 is a diagram showing a schematic structure of a surface discharge type AC plasma display according to a preferred embodiment to which the present invention is applied.
In FIG. 1, reference numerals 1 and 2 respectively denote a front substrate and a rear substrate which are arranged to face each other in parallel with the gas discharge space 3 interposed therebetween. The front substrate 1 and the rear substrate 2 are made of glass having a predetermined thickness.

On the surface of the front substrate 1 facing the rear substrate 2, an electrode pair including an X electrode 4a and a Y electrode 4b is formed. These electrode pairs are covered with a dielectric layer 5 made of glass. Further, the dielectric layer 5 is coated with a sol solution in which an aggregate of magnesium hydroxide fine particles described later is dispersed in an organic solvent, It is covered with a protective layer 6 made of a magnesium oxide film formed by drying and baking.
On the surface of the rear substrate 2 facing the front substrate 1, an address electrode 7, a barrier 8 and a phosphor layer 9 are formed. Further, a titanium dioxide film (high-refractive-index layer) 10 and a silicon dioxide film (low-refractive-index layer) 11, for example, are formed on the front substrate 1 as antireflection layers as required.

FIG. 2 is a diagram showing a schematic structure of a facing discharge type AC plasma display to which the present invention is applied. In FIG. 2, an X electrode 4a is formed on the surface of the front substrate 1 facing the back substrate 2, and the X electrode 4a is covered with a dielectric layer 5 made of glass. And a protective layer 6 made of magnesium oxide formed from a sol solution described later.
On the surface of the rear substrate 2 facing the front substrate 1, a Y electrode 4b, a dielectric layer 5, a protective layer 6 formed in the same manner as described above, and a barrier 8 and a phosphor layer 9 are formed. .
Further, a titanium dioxide film (high-refractive-index layer) 10 and a silicon dioxide film (low-refractive-index layer) 11, for example, are formed on the front substrate 1 as anti-reflection film layers, if necessary.

Next, the present invention is mainly characterized, and a sol solution for forming a protective layer of the plasma display of the present invention will be described.
The sol solution used in the present invention is a sol solution in which an aggregate of fine particles of magnesium hydroxide is dispersed in an organic solvent containing at least one kind of a hydroxyl-containing organic compound. The aggregates of the magnesium hydroxide fine particles are produced by hydrolyzing a magnesium compound which becomes magnesium hydroxide in the presence of water into magnesium hydroxide with an appropriate catalyst, and are obtained by removing the magnesium compound from the production medium.

One example of a preparation example of an aggregate of magnesium hydroxide fine particles is shown below.
Table 1: Preparation Example of Aggregate of Magnesium Hydroxide Fine Particles Pure Water 200 parts by mass Magnesium acetate (tetrahydrate) 21 parts by mass Ammonia water (28% by volume) 6 parts by mass Contains the composition as shown in Table 1 above By stirring the mixed solution at room temperature for 1 hour, a precipitate in which the magnesium hydroxide fine particles are aggregated is formed. This is separated from water, which is the production medium, by an appropriate method to obtain an aggregate of magnesium hydroxide fine particles.

  The above example is one example. Generally, the magnesium compound to be used may be any magnesium compound as long as it generates magnesium hydroxide in the presence of water, and the catalyst may be any of these magnesium compounds. May be any as long as it promotes hydrolysis. When the magnesium compound is a magnesium salt, a basic compound is used, and the catalyst is used in an amount equal to or more than one equivalent, preferably about 1 to 5 equivalents, per equivalent of the magnesium compound. When the catalyst is an aqueous solution such as aqueous ammonia as in the above example, the water in the aqueous ammonia can be used as the water in the above table.

  As for the magnesium compound, instead of magnesium acetate in the table, for example, magnesium chloride, magnesium nitrate, a strong acid magnesium salt represented by magnesium sulfate, or magnesium phosphate, magnesium hydrogen phosphate, magnesium dihydrogen phosphate, magnesium carbonate, citric acid A weak acid magnesium salt such as magnesium, magnesium hydrogen citrate, and magnesium formate, or a magnesium salt of an aliphatic carboxylic acid such as magnesium stearate and magnesium myristate may be used.

  Ammonia in the ammonia water serves as a catalyst for accelerating the production of magnesium hydroxide. Instead of this ammonia, ammonium acetate, ammonium amidosulfate, ammonium carbonate, ammonium hydrogen carbonate, ammonium borate, ammonium citrate Various ammonium salts such as ammonium, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, triammonium phosphate, ammonium formate and ammonium tartrate, or amines such as hydroxylamine, ethanolamine and methanolamine may be used.

  From the mixed solution containing the precipitate formed by aggregation of the magnesium hydroxide fine particles generated as described above, the method of separating the aggregate of the magnesium hydroxide fine particles is not particularly limited, for example, filtration, decantation, centrifugation, etc. Any method may be used. In addition, a cooling centrifugal separator (Model 7930, manufactured by Kubota Seisakusho) was used to separate the aggregates of the magnesium hydroxide fine particles generated in Table 1 above.

  The aggregate of magnesium hydroxide fine particles obtained as described above is dispersed in an organic solvent containing at least one kind of hydroxyl group-containing organic compound to obtain a sol solution used in the present invention. The amount of the organic solvent for dispersing the aggregates of the magnesium hydroxide fine particles can be arbitrarily set, but care must be taken since the coating film thickness is controlled by the parameter setting value. For example, in consideration of the suitability for coating the obtained sol solution, it is preferable to use the organic solvent as the dispersion medium at a ratio of 500 to 1500 parts by mass per 100 parts by mass of the magnesium hydroxide fine particles. If the solid content is too low, it is difficult to form a dense and continuous protective layer, and if the solid content ratio is too high, fine particles tend to aggregate and precipitate, or the uniformity of the formed protective layer tends to decrease. Is not preferred. One example of the sol solution is shown in Table 2 below.

Table 2: Preparation example of sol solution Aggregates of magnesium hydroxide fine particles 1 part by mass Ethanol 10 parts by mass The method of dispersing the aggregates may be a simple dispersing method such as simple stirring, forced stirring, a ball mill, a sand mill, and ultrasonic dispersion. A uniform sol solution can be easily obtained by these dispersing means. The dispersion of the composition in Table 2 was performed using an ultrasonic apparatus (MODEL US-300T manufactured by Nippon Seiki Co., Ltd.).

  The above-mentioned ethanol as a dispersion medium of the sol solution is an example, and may be an organic compound having at least one hydroxyl group or an organic solvent containing at least one kind thereof. For example, in place of the above ethanol, monohydric alcohols represented by methanol, n-propyl alcohol, i-propyl alcohol, 1-butanol and 2-butanol, or ethylene glycol, diethylene glycol, 2-methoxyethanol, 2-ethoxy Ethanol, dihydric alcohols represented by triethylene glycol and derivatives thereof, or trihydric or higher polyhydric alcohols represented by glycerin, aromatic compounds such as phenol and cresol, and further, a mixed solvent thereof, or An organic solvent containing at least one of these hydroxyl group-containing organic solvents may be used.

In the present invention, the reason why the aggregate of the magnesium hydroxide fine particles is easily dispersed in the organic solvent as described above by a simple dispersing means is considered as follows.
That is, when the aggregates of the magnesium hydroxide fine particles are dispersed in the hydroxyl group-containing organic solvent, the hydroxyl group-containing organic solvent is separated into individual magnesium hydroxide fine particle aggregates (2 The fine particles of the individual magnesium hydroxide are bonded to, coordinated with, or adsorbed to the (secondary aggregate), and become fine particles in which a kind of protective film composed of the above-mentioned hydroxyl group-containing organic solvent is formed on the surface of the fine particles. Accordingly, it is considered that the affinity of the sol solution with the organic solvent as the dispersion medium is improved, the aggregation of the fine particles in the organic solvent is suppressed, and the fine particles are easily and stably dispersed in the organic solvent. Considering only this effect, any organic compound having a hydroxyl group is applicable.However, in order to remove the organic solvent in the drying and baking steps after applying the sol solution, it is necessary to use a sol to form a pure magnesium oxide film. As the organic solvent of the solution, it is preferable to use a hydroxyl group-containing organic solvent having a relatively low boiling point.

  As the solvent for the sol solution, use of water or a solvent having no hydroxyl group, such as toluene or hexane, in place of the alcoholic organic solvent described above, the magnesium hydroxide fine particles are contained in the solvent. Since it is difficult to stably disperse and agglomeration and precipitation are likely to occur, it is preferable to use the organic solvent having a hydroxyl group as described above or an organic solvent containing at least one of the above as a solvent for the sol solution.

As experimental results supporting the above considerations, Table 3 shows characteristic results of each sol solution used in the present invention and Comparative Example 1 described later.
Table 3: Characteristic results of various sol solutions
Sample Average particle size Solid content ratio Stability over time Example 1 873 nm 0.9 mass% good
Comparative Example 1 Unmeasurable 2.0 mass% defective
The sol solution of Comparative Example 1 was a sol solution prepared by dispersing aggregates of magnesium hydroxide fine particles of Table 1 in pure water instead of ethanol.

  As a characteristic evaluation method, the average particle size of the fine particles in the sol solution was measured and evaluated using a laser particle analyzer (PAR-III manufactured by Otsuka Electronics Co., Ltd.) under the condition of pinhole φ0.2. Further, the solid content ratio was evaluated by putting a constant mass of each sol solution into a sample tube and drying it at 120 ° C. for 3 hours, and measuring the mass concentration of the residue. Further, with respect to the stability with time, after each sol solution was prepared, it was allowed to stand for one day and evaluated whether or not a precipitate was formed.

The method of manufacturing an AC plasma display according to the present invention is characterized in that the sol solution as described above is applied on the dielectric layer, dried and fired to form the protective layer.
The method of applying the sol solution on the dielectric layer may be any method, for example, spin coating, dip coating, spray coating, roll coating, meniscus coating, bar coating, curtain flow coating. Various coating methods, such as a bead coating method and a casting method, can be applied.

  By drying and baking the wet coating film formed by the application, a transparent magnesium oxide film as a protective layer is formed, and the film has strong adhesion to the dielectric layer 5. The drying may be performed at a temperature and for a time at which the organic solvent component in the wet film substantially evaporates. For example, it is sufficient to perform the drying at a temperature of about 200 to 300 ° C. for about 1 to 3 hours. The firing is preferably performed at a temperature of about 350 to 550 ° C. for about 1 to 5 hours. If the firing conditions are too severe, there is a problem such as peeling or cracking of the protective layer due to softening of the dielectric layer. On the other hand, if the firing is insufficient, a protective layer having desired characteristics cannot be formed. Further, drying and firing are preferably performed continuously, but may be performed separately. In the examples described below, drying and firing were performed continuously at 300 ° C. for 1 hour, and further at 400 ° C. for 1 hour.

  In the present invention, a scanning electron microscope photograph (magnification: 50,000 times, equipment used: J-Electronic Co., Ltd., S-800) showing the fine particle structure on the surface of the protective layer composed of the magnesium oxide film formed as described above is shown. 3 is shown. For comparison, FIG. 4 shows a photograph of the surface of the protective layer in the case of Comparative Example 3 described below, which was produced by a vacuum evaporation method. The measurement conditions were an acceleration voltage of 5 kV, a distance between samples of 5 mm, a beam monitor aperture No. 2, and an objective movable aperture No. 3. According to FIG. 3, the protective layer made of a magnesium oxide film according to the present invention is a dense continuous film having a fine particle shape with fine particles on its surface and an average particle diameter of 30 nm. The surface morphology of the film is distinctly different from that of the case of magnesium oxide formed by a vacuum evaporation method having a flake shape and an average particle diameter of 200 nm (see FIG. 4).

  From the viewpoint of increasing the secondary electron emission ratio in the AC plasma display in the present invention, it is necessary to increase the surface area of the magnesium oxide fine particles forming the protective layer, and the particle diameter of the magnesium oxide fine particles is 3 to It is desirably in the range of 100 nm, preferably in the range of 5 to 30 nm. The surface area is increased by reducing the particle diameter to 100 nm or less to eliminate gaps between the fine particles, and a magnesium oxide film can be formed efficiently even by a normal heat treatment process. The thickness of the formed magnesium oxide film is not particularly limited, but is preferably 10 μm or less, particularly preferably 1 μm or less from the viewpoint of transparency.

  As a protective layer in the AC plasma display of the present invention obtained as described above, a thin film having a film thickness of 1 μm or less can be realized, and such a film thickness cannot be realized by a paste using a conventional binder. .

Example 1
The opposed discharge AC type plasma display shown in FIG. 2 was manufactured as follows. An X electrode 4a having a thickness of 0.2 μm is formed as a chromium electrode on a front substrate 1 made of glass by a vacuum evaporation method, and then a dielectric layer 5 having a thickness of 0.8 μm is formed by a vacuum evaporation method. Using the sol solution shown in Table 2 above, a protective layer 6 having a thickness of 0.2 μm and made of a magnesium oxide film was formed on the layer 5. Next, a barrier 8 having a thickness of 150 μm was formed on the protective layer 6 by screen printing, and a fluorescent substance was applied to the barrier 8 to form a phosphor layer 9 having a thickness of 10 μm.

On the other hand, the Y electrode 4b was formed by patterning a chromium electrode formed on the rear substrate 2 made of glass by a vacuum evaporation method, and then the dielectric layer 5 was formed on the Y electrode 4b by the same vacuum evaporation method. Thereafter, a protective layer 6 having a thickness of 0.2 μm made of a magnesium oxide film was formed by the method of forming a magnesium oxide film. The thickness of the chromium electrode (Y electrode 4b) on the back substrate 2 was 0.2 μm, and the thickness of the dielectric layer 5 was 0.8 μm.
The two substrates obtained in each of the above steps are bonded together with the protective layer inside, and a space surrounded by the barrier 8 is filled with a He—Xe (1.1%) penning gas at 500 Torr. A discharge AC type plasma display was manufactured.

Comparative Example 1
In the above-described example, the same operation as in the example was performed, except that the sol solution prepared by dispersing the aggregates of the magnesium hydroxide fine particles in pure water instead of ethanol in preparing the sol solution was used. An attempt was made to fabricate a counter discharge AC plasma display.

Comparative Example 2
In the above-described embodiment, a facing discharge AC type plasma display was manufactured in the same manner as in the above-described embodiment, except that a paste of magnesium oxide was applied to the protective layer 6 made of a magnesium oxide film by a screen printing method. The used magnesium oxide paste was prepared by mixing magnesium oxide powder (UBE2000A manufactured by Ube Industries, Ltd.) having an average primary particle diameter of 0.18 to 0.25 μm in a Si-based binder (SiO ₂ 10 parts by mass) in an amount of 26% by mass. A dispersion prepared at a ratio of 7,000 cps / 25 ° C. was used.
The printing conditions were a plate gap of 2.3 mm, a squeegee pushing amount of 1 mm, a scraper pushing amount of 1 μm, a screen plate mesh of 400, and an emulsion thickness of 10 μm. The firing was performed at a firing temperature of 580 ° C. under atmospheric pressure for 1 hour.

Comparative Example 3
A facing discharge AC type plasma display was manufactured in the same manner as in the above example except that the protective layer 6 made of a magnesium oxide film was formed by a vacuum deposition method. The vacuum deposition machine used an electron beam deposition machine (EX-900-C16, manufactured by Japan Vacuum Engineering Co., Ltd.) to form a film at a substrate temperature of 300 ° C. and a film formation rate of 0.5 nm / s. 0.5 μm.
Table 4 shows the results of evaluating the film characteristics of the protective layer made of magnesium oxide on the facing discharge AC type plasma displays (hereinafter, referred to as panels) of the examples and the comparative examples manufactured as described above before paneling. . The adhesion and film strength shown in the table were evaluated by a scratch tester and a pencil hardness test method. The transparency and the presence or absence of cracks depended on visual judgment. The film thickness was evaluated using a stylus type film thickness meter (α step 300 manufactured by Tencor Corporation).

Table 4: Film properties of various magnesium oxide films

In Comparative Example 1, although the wettability of the sol solution was poor and the conditions were changed such as changing the application speed, a wet coating film could not be formed uniformly on the dielectric layer 5 after all. Therefore, evaluation results as shown in Table 4 were obtained. In Comparative Example 2, the film thickness was 3 μm, which was thicker than the other examples, and it was white and poor in transparency. For Comparative Example 3, there was no particular problem.
Next, with respect to the counter discharge AC type plasma display excluding Comparative Example 1 in which the protective layer could not be formed, the discharge start voltage Vf and the minimum maintenance were maintained by an AC pulse having a drive waveform of 15 kHz and a duty ratio of 23%. The voltage Vsm was measured.

After the discharge start voltage was set, continuous lighting was performed for 60 minutes. Thereafter, the minimum sustaining voltage was measured, and a change with time in the voltage was examined by comparison with the initial minimum sustaining voltage to evaluate the life characteristics of the panel. Table 5 shows the results.
Table 5: PDP characteristics of various magnesium oxide films

  As shown in Table 5, with respect to the panel manufactured in this example, the discharge starting voltage was 155 V and the minimum sustain voltage was 110 V, and there was no problem in the life characteristics without fluctuation of the minimum sustain voltage. In the case of the panel manufactured in the comparative example, in the case of the comparative example 2, the discharge starting voltage was 240 V and the minimum sustaining voltage was 175 V, which was a higher measured value than that of the present example, and a result that a high panel driving voltage was required. Was. In the life characteristics at this time, an increase in the minimum sustaining voltage was confirmed 30 minutes after the discharge start voltage was set. In the case of Comparative Example 3, the discharge start voltage was 160 V and the minimum sustain voltage was 105 V, and there was no problem in the life characteristics without a change in the minimum sustain voltage.

The results of the present example show that a good panel exhibiting the original function of the magnesium oxide film is obtained even when compared with the other comparative examples, especially the comparative example 3 in the case of using a vacuum deposition method which has been proven as a conventional method. It shows that it was obtained.
From the above results, it is understood that the protective layer made of the magnesium oxide film in the opposed discharge AC plasma display obtained in the present example exhibits sufficient characteristics in the opposed discharge AC plasma display.

According to the AC type plasma display of the present invention, since the continuous film of the magnesium oxide film composed of the fine particles having a particle diameter of 100 nm or less is used as the protective layer, the transparency is high and the thickness of the protective layer is reduced. In addition, since the film strength is high, there is no possibility that the dielectric layer is exposed due to cracks. Therefore, since the drive voltage can be reduced, the cost of the drive circuit can be reduced, and as a result, the cost of the plasma display body can be reduced.
Further, since the protective layer can be formed by applying a sol solution by a coating method, it can be formed at a low cost for a large area as compared with a film forming method by a thin film method, For example, a plasma display having a large area (for example, a diagonal of about 40 inches) can be manufactured at low cost.

According to the production method of the present invention, since the sol solution uses an organic compound having at least one hydroxyl group as a solvent or an organic solvent containing at least one of the compounds, the magnesium hydroxide fine particles aggregate. It becomes a sol solution dispersed stably for a long period of time, so that the constituent fine particles of the magnesium oxide film produced by applying and baking using the sol solution are finely divided, and the protective layer formed is Transparency can be improved.
According to the production method of the present invention, since an organic solvent is used as a solvent for the sol solution, no organic matter remains as a residue in the magnesium oxide film in the firing step, and the protective layer is made of pure magnesium oxide. Can be manufactured.

  In general, when the protective layer of an AC plasma display is thick, for example, about 10 μm, the effect of wall charge, which is a source of a memory function, which is one of the important characteristics of the AC plasma display, is weakened, and the driving voltage is reduced. Must be increased, and as a result, the voltage of the transistor used in the drive circuit must be set to a high withstand voltage specification. Therefore, forming a protective layer with a thickness of 2 μm or less is the most necessary and sufficient condition in practical use. However, according to the present invention, a protective layer with a thickness of 2 μm or less can be sufficiently formed. .

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the outline of the surface discharge type alternating current type plasma display of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the outline of the alternating current type plasma display of the opposed discharge system of this invention. 5 is a scanning electron micrograph (magnification: 50,000 times) showing the fine particle structure on the surface of the protective layer made of the magnesium oxide film of the example. 9 is a scanning electron micrograph (magnification: 50,000 times) showing the fine particle structure on the surface of a protective layer formed of a magnesium oxide film by a vacuum evaporation method in Comparative Example 3.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Gas discharge space 4a X electrode 4b Y electrode 5 Dielectric layer 6 Protective layer 7 Address electrode 8 Barrier 9 Phosphor layer 10 Titanium dioxide film (high refractive index layer)
11 silicon dioxide film (low refractive index layer)

Claims (4)

  The rear substrate and the front substrate are arranged to face each other with the gas discharge space interposed therebetween, and a pair of electrodes covered with a dielectric layer is formed on one or both substrates, and protection is performed on the dielectric layer. In the method for manufacturing an AC type plasma display for forming a layer, the protective layer is formed by dispersing an aggregate of magnesium hydroxide fine particles in an organic solvent containing at least one kind of a hydroxyl group-containing organic compound. A method for producing an AC type plasma display, wherein the method is applied on a layer, dried and fired.   The method for producing an AC type plasma display according to claim 1, wherein the sol solution is obtained by dispersing an aggregate of magnesium hydroxide fine particles generated in water in an organic solvent containing at least one kind of a hydroxyl group-containing organic compound. .   3. The method for producing an AC plasma display according to claim 1, wherein the fine particles of magnesium hydroxide are formed by forming a magnesium salt using ammonia as a catalyst.   The method for producing an AC type plasma display according to any one of claims 1 to 3, wherein the aggregate of the magnesium hydroxide fine particles in the organic solvent is dispersed by an ultrasonic dispersion method.