JPH10116556A - Partition structure of plasma display and method of forming the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a partition structure of a plasma display which can be easily manufactured and has excellent heat dissipation of a substrate, and a method of forming the same. SOLUTION: A surface of a concave and convex portion having a predetermined shape formed on one main surface of an anodizable metal substrate is covered with an insulating film made of an anodized film. By using the metal substrate 1 having good heat conductivity, the heat dissipation is excellent, and one main surface of the metal substrate 1 that can be anodized in the forming method is formed into a predetermined shape by a chemical etching method or mechanical grinding. It can be easily manufactured by forming the uneven portions 2 and 3 and forming an anodic oxide film having a predetermined thickness on the surface of the metal substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a partition structure formed on a rear substrate of a plasma display and a method of forming the same.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for colorization of large flat displays in the OA and AV fields. There is a color plasma display panel (hereinafter, referred to as a color PDP) as a large color display that meets such a demand.

FIGS. 4 and 5 are cross-sectional views of DC and AC color PDPs, respectively. The color PDP has a front glass substrate 11, a rear glass substrate 12, and partition walls 13 arranged so as to form a large number of cells therebetween. Electrodes corresponding to each cell are arranged in a direction orthogonal to each other on opposing surfaces of the substrates 11 and 12. The partition 13 is provided irrespective of the type of AC or DC discharge. By regulating the distance between the two glass substrates 11 and 12 by the partition walls 13,
An appropriate discharge gap can be ensured, and crosstalk to an adjacent cell can be prevented.

Usually, a partition 13 of an AC type color PDP is used.
Are formed in a stripe shape as shown in FIG.
The partition 13 of the mold color PDP is formed in a matrix as shown in FIG. R inside the partition 13
Phosphor layers 14 of three colors (red), G (green), and B (blue) are formed, and an inert gas is sealed therein.

In such a color PDP, a color image is displayed by applying a voltage between the electrodes in accordance with an image signal to discharge in a desired cell and cause the phosphor layer 14 to emit light.

[0006] This type of color PDP is manufactured as follows. First, a front substrate 11 and a rear substrate 12 are manufactured by forming various projections serving as electrodes and partition walls on a glass substrate, and the substrates 11 and 12 are opposed to each other. Is filled with an inert gas. Finally, the control circuit and the chassis are assembled to complete the color PDP.

When manufacturing the rear substrate 12, in the case of the DC type, first, electrodes and buses connecting the electrodes are formed on a glass substrate by a screen printing method. Subsequently, a resistor for connecting the bus bar and the electrode is formed. Once the electrodes are formed,
A glass paste is applied thereon by a screen printing method to form an insulating layer. In the insulating layer, holes are formed in the portion where the cathode is formed so that the electrodes are exposed. The holes are filled with a metal paste by a screen printing method to form a cathode. When the cathode is formed, partition walls 13 are formed in a matrix around the cathode by printing and sandblasting a plurality of times. Finally, the phosphor layer 14 is inserted and formed in the order of R, G, and B in the space surrounded by the partition 13 by the screen printing method.

[0008]

As described above, in the conventional process of manufacturing a color PDP, the partition 13 is mainly formed by screen printing. However, the height of the partition 13 needs to be about 150 to 200 μm. , Printing and drying must be repeated more than 10 to 20 times,
There is a problem that it takes considerable time. In addition, although there is a great demand for a large size recently, there is also a problem that as the size increases, the power consumption is large and the glass substrate may be broken due to heat generation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a partition wall structure of a plasma display which can be easily manufactured and has excellent heat dissipation of a back substrate, and a method of forming the same, in view of the above-mentioned conventional problems.

[0010]

The partition structure of a plasma display according to the present invention is preferably configured such that the surface of a concavo-convex portion having a predetermined shape formed on one main surface of a metal substrate serving as a back substrate is covered with an insulating film. The metal substrate is a metal plate that can be anodized and the insulating film is composed of an anodic oxide film. The partition walls are formed by covering the surface of the irregularities with the insulating film. Not glass with poor thermal conductivity,
By using a metal substrate having good thermal conductivity, heat dissipation is excellent. In addition, an uneven portion having a predetermined shape is formed on one main surface of the anodizable metal substrate by a chemical etching method or mechanical grinding, and an anodic oxide film having a predetermined thickness is formed on the surface of the metal substrate. Thereby, a highly reliable insulating film can be easily manufactured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a partition structure of a plasma display and a method of forming the same according to the present invention are shown in FIGS.
This will be described with reference to FIG.

FIG. 1 shows a rear substrate on which a partition structure of an AC type plasma display is formed.

In FIG. 1, reference numeral 1 denotes an anodizable metal substrate serving as a base material of a rear substrate. 2 is a concave portion formed on the surface of the metal substrate 1, and 3 is a convex portion. Reference numeral 4 denotes an insulating film formed so as to cover the entire metal substrate on which the uneven portions are formed, and is formed of an anodic oxide film. 5 is an address electrode, and 6 is a phosphor layer.

Next, a method of manufacturing the color PDP will be described with reference to FIGS.

The metal substrate 1 for forming the back substrate is made of an aluminum plate having a size of 300 mm × 400 mm and a thickness of 2 mm. A pitch of 20 is formed on the surface of this aluminum plate.
0 μm, the width of the concave portion 2 is 150 μm, and the width of the convex portion 3 is 50 μm.
A stripe-shaped uneven portion having a thickness of 200 μm and a depth of 200 μm is formed (see FIG. 2A). This uneven portion was formed by grinding.

Subsequently, the metal substrate 1 was subjected to anodic oxidation using an aqueous solution of ammonium tartrate to form an insulating film 4 made of an anodic oxide film (see FIG. 2B). The anodic oxidation was performed under the conditions of an oxidation voltage of 300 V and an oxidation current of 5 mA / cm ² .

Next, a silver-palladium paste is printed on the bottom of the concave portion 2 of the partition wall formed as described above by screen printing, and baked at about 500 ° C. in air to evaporate the binder component. The address electrode 5 was formed (see FIG. 2C).

Subsequently, phosphors R, G, and B are sequentially applied to the bottom surface and the wall surface of the concave portion 2 by screen printing, and baked at a temperature of about 500 ° C. in the same air to evaporate a binder component. Was formed (see FIG. 2D). Thus, a rear substrate was formed.

The rear substrate manufactured in this way and the front substrate manufactured in a separate process are bonded together, and the air inside is replaced with an inert gas to complete the display portion. Finally, the electronic circuit and the chassis are assembled. The color PDP is completed.

In the above description, a mechanical grinding method has been exemplified as a method for forming irregularities on the metal substrate 1.
As shown in (1), it may be formed by a chemical etching method.

A specific example will be described. In FIG. 3, a resist pattern 7 having a thickness of 2 μm, a pitch of 200 μm, and a pattern width of 100 μm is formed on the surface of the metal substrate 1.
(See (a)), a concave portion 2 was formed by etching a portion not covered with the resist using a phosphoric acid-based solution as an etchant (see FIG. 3B). In this way, a striped uneven portion having a pitch of 200 μm, a width of the concave portion 2 of 150 μm, a width of the convex portion 3 of 50 μm, and a depth of 150 μm was formed. The method shown in FIG. 3 is also applicable to a method of manufacturing an AC type color PDP having stripe-shaped uneven portions.
DC type color PD having matrix-shaped irregularities
It is also suitable as a method for producing P.

The present invention is not limited to the anodic oxidation conditions and the etching conditions shown in the above embodiment. For example, the anodizing solution may be a neutral electrolyte solution,
The solvent is not limited to water, and may be a mixed solvent with a polyhydric alcohol solvent such as ethylene glycol. Also, oxidation voltage,
It goes without saying that the current is not limited to that.

[0023]

According to the partition structure of the plasma display and the method of forming the same according to the present invention, as is apparent from the above description, a metal substrate having good heat dissipation is used, and the unevenness is formed on one principal surface thereof. Since the surface is covered with an insulating film to form a partition wall, it can be formed more easily than the conventional method of repeating screen printing and drying many times, and the heat generated during driving can be quickly reduced. Since the heat can be dissipated, the influence of heat generation can be reduced.

Further, the metal substrate is formed of an anodically oxidizable metal plate, and the insulating film is formed of an anodic oxide film. One main surface of the anodically oxidizable metal substrate is formed by chemical etching or mechanical grinding. By forming an irregular portion having a predetermined shape and forming an anodic oxide film having a predetermined thickness on the surface of the metal substrate, a highly reliable insulating film can be formed more easily.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing one embodiment of a partition structure of a plasma display of the present invention.

FIG. 2 is an explanatory diagram of a process of forming a partition structure in the embodiment.

FIG. 3 is an explanatory diagram of a process of forming unevenness of a metal substrate by an etching method in the same embodiment.

FIG. 4 is an exploded perspective view showing a main part structure of a DC type color PDP of a conventional example.

FIG. 5 is an exploded perspective view showing a main structure of a conventional AC type color PDP.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal substrate 2 Concave part 3 Convex part 4 Insulating film consisting of an anodic oxide film

Claims (5)

[Claims] 1. A partition structure for a plasma display, wherein a surface of an uneven portion having a predetermined shape formed on one main surface of a metal substrate serving as a rear substrate is covered with an insulating film. 2. The partition structure of a plasma display according to claim 1, wherein the metal substrate is made of an anodizable metal plate, and the insulating film is made of an anodized film. 3. A method according to claim 1, further comprising the steps of: forming a concave and convex portion having a predetermined shape formed on one main surface of the anodizable metal substrate; and forming an anodic oxide film having a predetermined thickness on the surface of the metal substrate. A method for forming a partition structure of a plasma display. 4. The method according to claim 3, wherein the irregularities having a predetermined shape formed on one main surface of the anodizable metal substrate are formed by a chemical etching method. . 5. The method for forming a partition structure of a plasma display according to claim 3, wherein an irregular portion having a predetermined shape formed on one main surface of the anodizable metal substrate is formed by mechanical grinding.