JP2002117770A - Gas discharge panel substrate and gas discharge panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve heat radiation property coping with expansion of the screen of a PDP, to reduce the weight of a panel and to improve luminance by the improvement of the heat radiation property at the same time. SOLUTION: The heat radiation property of the panel is improved by farming recessed and projecting parts on the outside surface of a dielectric sheet when only the dielectric sheet is used as a front plate, that is, on an electrode formed on a surface not in contact with a discharge gas, or by providing an insulating coating material having high thermal conductivity on an uneven electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a gas discharge panel,
That is, a plasma display panel (hereinafter, PDP)
), And particularly to a PDP substrate.

[0002] In recent years, PDPs have been positioned as the most prominent for large flat panel displays, and are also suitable for displaying moving images.
It is the centerpiece of displays in the digital technology society. In the future, it is expected that higher image quality and higher efficiency will be promoted.

[0003]

2. Description of the Related Art As a recent PDP structure, a three-electrode surface discharge type PDP is generally known.

A conventional PDP, that is, a three-electrode surface discharge type PD
As for P, as shown in FIG. 3, the front plate 101 and the back plate 106 are opposed to each other, and the inner surface of the front plate has a plurality of adjacent two pairs of parallel display electrodes 103. A pair, a 40 μm-thick dielectric layer 104 made of low-dielectric glass that covers the display electrode 103, and a 8000 ° M Mg layer as a protective film 105 on the surface of the dielectric layer 104.
An O film is formed. As a method for forming the MgO film, an evaporation method, a sputtering method, or the like is generally used. On the other hand, on the inner surface of the back plate 106, partition walls 110 and data electrodes 108 that partition the discharge space are arranged in parallel, and a phosphor 111 is applied to the cells partitioned by the individual partition walls 110. . Then, after the front plate 101 and the rear plate 106 are opposed to each other and overlapped with each other, the periphery thereof is sealed, the inside of the discharge space is exhausted, and a neon mixed gas containing several volume% of xenon is sealed. I have.

Further, recently, erroneous discharge between individual discharge cells isolated between partition walls, noise reduction due to vibration between the partition walls and the front plate, increase in internal gas pressure and expansion of the panel under low pressure. It has been proposed to apply a low-melting glass to the upper end of the partition wall and to join the partition wall and the front plate with the low-melting glass for the purpose of preventing the occurrence of cracks (JP-A-5-334).
No. 956, JP-A-9-259754).

The three-electrode surface-discharge type PDP 114 configured as described above applies a voltage to the data electrode 108 and the display electrode 103 at an appropriate timing to form a space defined by partition walls 110 corresponding to display pixels. Discharge occurs at 112 and ultraviolet light is generated by xenon gas. An image can be displayed by emitting visible light from the phosphor excited by the ultraviolet light.

The PDP has a simple surface discharge type cell structure in which two substrates are overlapped as described above, so that even if the screen is enlarged, the depth dimension and weight increase like a CRT. It is also excellent in that there is no problem that the viewing angle is limited unlike LCD.

[0008]

However, while it is very advantageous to enlarge the screen, the amount of heat radiation from the display screen accompanying the enlargement of the screen becomes considerable. If the panel temperature rises partially, a temperature difference occurs on the substrate, causing a fatal problem such as cracking of the panel.

The principle of light emission of a PDP is basically the same as that of a fluorescent lamp. By generating glow discharge, ultraviolet rays are generated from Xe to excite the phosphor to emit light. But,
Since the conversion efficiency of the discharge energy to ultraviolet light and the conversion efficiency of the phosphor to visible light are low, it is difficult to obtain high brightness like a phosphor. About 0.2% (Optical Technology Contact Vol. 34, No. 1, P
25, 1996). In recent years, various efforts have been made to improve the luminous efficiency, but a dramatic luminous efficiency cannot be expected immediately. In the current luminous efficiency, when an image is displayed, most of the electric power is converted into heat, so that it is necessary to take measures to radiate heat from the panel. In general, after two sheets of glass are bonded together, a heat dissipation sheet with good adhesion to the glass is sandwiched between the chassis and the chassis to dissipate heat from the back to the chassis. Ingenuity has been given to the structure. Recently, when two panels are bonded together to form a panel, the back substrate is made of a metal plate with good heat dissipation, and the panel itself with a dielectric sheet attached has the performance as a heat sink. Began to be produced. However, as the screen size increases, it is necessary to consider the heat radiation on the front panel side as a countermeasure against partial heat generation due to image display, but a fundamental solution is to solve it. There is no present.

Further, when the screen is enlarged, the weight of the two glass substrates cannot be neglected as described in the conventional PDP, and the problem of reducing the weight of this panel also remains in order to utilize the features of the PDP. However, with respect to this as well, only countermeasures such as thinning a 2.8 mm-thick glass substrate, which is currently mainstream, are being considered, and there is no fundamental countermeasure at present.

[0011] In view of these problems, the present invention provides a PDP.
The purpose of the present invention is to make it possible to greatly improve the heat radiation and to reduce the weight of the panel corresponding to a large screen, and to simultaneously improve the luminance by the improvement of the heat radiation.

[0012]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention is to improve the heat radiation of a gas discharge panel substrate which is a front plate of the gas discharge panel. The gas discharge panel substrate of the present invention has a protective film formed on one surface of a dielectric sheet, that is, a discharge side surface, by removing a conventional front plate,
This is a configuration in which an electrode is formed on the other surface. JP-A-10-177845 and JP-A-11-260
As in 267, it has been proposed to form a panel using a dielectric sheet as a glass sheet, but we have proposed that the front panel be made of only a dielectric sheet and be in contact with the outside of the dielectric sheet, that is, in contact with the discharge gas. It has been found that the local heat dissipation can be significantly changed by forming irregularities on the electrode formed on the surface that is not formed.

Accordingly, a first aspect of the present invention is directed to a transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, and a protection electrode formed on the other surface of the transparent substrate. The electrode is characterized in that at least a part of the surface of the electrode is uneven. Here, the unevenness of the electrode surface has a surface average roughness (Ra) of 0.5 μm to 5 μm.
m is preferable. It has been found that the unevenness of the electrode surface significantly improves the heat transfer between the pixels. Thereby, the difference in the glass surface temperature can be partially reduced. Here, the transparent substrate is preferably a glass sheet. Since the film thickness determines the discharge voltage, it is preferably 20 μm to 50 μm. Further, as the protective film, alkali metal oxides, alkaline earth oxides, or may be a mixture thereof is MgO and Al ₂
O _{3 and the} like are preferred.

According to a second aspect of the present invention, there is provided a transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, and an insulating coating covering the electrodes and the transparent substrate. And a protective film formed on the other surface of the transparent substrate. It is preferable that this insulating coating material has better thermal conductivity than the transparent substrate. By forming the insulating coating material, the surface area is larger than that of the glass substrate, so that the heat radiation characteristics of the surface can be improved. Here, the transparent substrate is preferably a glass sheet. Since the film thickness determines the discharge voltage, it is preferably 20 μm to 50 μm. Further, as the protective film, alkali metal oxides, alkaline earth oxides, or may be a mixture thereof is MgO and Al ₂
O _{3 and the} like are preferred.

According to a third aspect of the present invention, there is provided a transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, and an insulating covering material covering the electrodes and the transparent substrate. And a protective film formed on the other surface of the transparent substrate, wherein at least a part of the surface of the electrode is uneven. Here, the transparent substrate is preferably a glass sheet. Since the film thickness determines the discharge voltage, it is preferably 20 μm to 50 μm. Further, the protective film may be an alkali metal oxide, an alkaline earth oxide, or a mixture thereof, but is preferably MgO or Al ₂ O ₃ .

In the first to third aspects of the present invention, the same effect can be obtained even if the electrode is composed of a transparent electrode and a metal electrode.

A fourth invention of the present invention is a gas discharge panel using the gas discharge panel substrate of the first to third inventions,
As a result, it is possible to provide a panel with better heat dissipation of the front panel than the conventional panel.

A fifth invention of the present invention is characterized in that the gas discharge panel substrate and the insulating substrate are joined via a partition. The thermal conductivity of the panel is further improved because the substrate is bonded to each of the pixels via the partition walls.

According to a fifth aspect of the present invention, there is provided a gas discharge panel according to the first to fourth aspects of the present invention, a display electrode driving circuit connected to a plurality of electrodes for driving the gas discharge panel, An address electrode driving circuit connected to an address electrode for selecting each pixel of the gas discharge panel, and a control unit for controlling each of the display electrode driving circuit and the address electrode driving circuit. And As a result, a lightweight panel with improved heat dissipation of the panel can be provided, and a high-quality display device with less luminance reduction can be provided.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a PDP using a gas discharge panel substrate of the present invention and a method of manufacturing the same will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows Embodiment 1 of the present invention.
FIG. 2 is an enlarged view of an electrode of the gas discharge panel substrate according to the first embodiment, and FIG. 4 is a cross-sectional view showing a main part of a conventional PDP.

As shown in FIG. 1, the PDP of the present invention has a vertical
54 mm wide 980 mm thick 30 μm glass sheet 12
1 on a silver paste (for example, NP-402 manufactured by Noritake)
8) is printed in a line having a thickness of 7 μm and a width of 80 μm.
At this time, two types of screen printing plates are prepared, and the line widths are the same, but the openings of one printing plate are partially changed in order to provide unevenness in the line direction. By firing the printed electrode, the display electrode 103 whose surface roughness (Ra) is Ra = 2 μm is obtained.
To form Next, the display electrode 103 and the glass sheet 12
Apply an organosilicon-based overcoat agent to cover 1
After drying, heat treatment is performed at 250 ° C. to form an insulating coating material 122 having a thickness of 2 μm. Further, the glass sheet 12
On the other surface of the substrate 1, M was used as a protective film 105 by CVD.
A 0.5 μm gO film is formed. Thus, the gas discharge panel substrate 120 as the front plate is completed.

On the other hand, the height is 570 mm and the width is 964 mm.
A silver paste (for example, NP-4028 manufactured by Noritake Co., Ltd.) is coated on an 8 mm back glass 107 with a thickness of 5 μm and a width of 100 μm
Is printed and baked to obtain the data electrode 108.
Next, a glass paste (for example, NP-79 manufactured by Noritake)
73) is printed and baked to form a back plate dielectric 1 having a thickness of 20 μm.
09. Further, on the back plate dielectric 109, multi-layer printing is performed by a screen plate so as to be parallel to the data electrodes 108, and baked, thereby forming the partition walls 11 having a height of 130 μm.
Get 0. The fluorescent substance 111 is printed in the discharge space formed by the partition walls 110, and is fired, so that the back plate 106 is formed.
Is completed.

The gas discharge panel substrate 120 and the back plate 1
06 are opposed to each other, the inside is evacuated to a vacuum, and a mixed gas of 95% by volume of neon and 5% by volume of xenon is added to 6
Enclose until 6.5 kPa, and complete PDP114. Here, a glass frit is applied not only to the periphery of the gas discharge panel 120 and the back plate 106 but also to the top of the partition wall, so that the partition 110 and the glass sheet 121 are joined together. The cell size of this PDP is 0.36 × 1.08 m
m, and the distance between the display electrodes is 80 μm.

(Comparative Example 1) As shown in FIG. 4, a conventional PDP having the same dimensions as the first embodiment of the present invention was manufactured. However, 2.8 mm thick glass was used for the front plate. The dielectric thickness is 30 μm.

Comparative Example 2 A PDP similar to that of the first embodiment of the present invention was manufactured. However, an insulating coating material covering the display electrode 103 and the glass sheet is not formed.

PDP manufactured in this embodiment and Comparative Example 1
Table 1 shows the results obtained by measuring the weight of the panel and the surface temperature of the entire panel.

[0028]

[Table 1]

As shown in Table 1, it can be seen that the PDP of the present invention has a large electrode film thickness of 7 μm, and furthermore has a good heat radiating property due to electric discharge since the electrode surface is uneven. This is considered to include the result that the thermal conductivity was further improved by the organic overcoat layer coated on the electrodes.

The input waveform to the display electrode is 10 kHz.
z, a rectangular wave with a duty ratio of 10%.

From these results, it can be seen that the PDP of the present invention is
It turns out that it shows the performance which is lightweight and excellent in heat dissipation as compared with DP.

As described above, the PDP using the gas discharge panel substrate of the present invention for the front panel can provide a PDP which is excellent in heat dissipation of the panel, lightweight and excellent, that is, a gas discharge panel.

As shown in FIG. 2, the gas discharge panel using the gas discharge panel substrate of the present invention is provided with a control circuit such as a display electrode drive circuit and an address electrode drive circuit, so that the gas discharge panel is light and heat-resistant. And a display device having excellent performance of heat dissipation without any panel cracks.

In this embodiment, the surface roughness of the electrode is Ra = 2 μm. However, the surface roughness of the electrode has an effect on the film thickness, but the surface roughness is less than 0.5 μm. The effect is not clear, and when the thickness exceeds 5 μm, a continuous electrode is not formed with a normal electrode thickness, so that the thickness is preferably 0.5 μm to 5 μm.

In this embodiment, the protective film is made of MgO.
However, the present invention is not limited to this, and the same result is obtained with an oxide having a high secondary electron emission coefficient, such as an alkali metal oxide or an alkaline earth metal oxide, or a nitride, Al ₂ O ₃ , or diamond. Needless to say, this is obtained.

In this embodiment, a silver electrode is used as an electrode. However, it is needless to say that the same result can be obtained if the surface area is not limited to a thick-film electrode or a thin-film electrode, but is increased.

[0037]

As described above, according to the present invention, a transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, and an insulating coating covering the electrodes and the transparent substrate are provided. And a protective film formed on the other surface of the transparent substrate, wherein at least a part of the electrode surface is uneven. By doing so, it is possible to greatly improve the heat radiation property corresponding to the large screen of the PDP and reduce the weight of the panel, and it is also possible to satisfy the improvement of the luminance at the same time by improving the heat radiation property.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a PDP according to a first embodiment.

FIG. 2 is a schematic diagram of a display device in which a driving circuit and a control unit are combined with the PDP of the present invention.

FIG. 3 is a schematic diagram showing a conventional PDP.

FIG. 4 is a sectional view showing a main part of a conventional PDP.

[Explanation of symbols]

 Reference Signs List 101 front plate 102 front glass 103 display electrode 104 dielectric layer 105 protective film 106 back plate 107 back glass 108 data electrode 109 back plate dielectric 110 partition 111 fluorescent substance 114 PDP 120 gas discharge panel substrate 121 glass sheet 122 insulating coating material 201 Control unit 202 Display electrode drive circuit 203 Address electrode drive circuit

Claims (12)

[Claims] A transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, and a protective film formed on the other surface of the transparent substrate; A gas discharge panel substrate, wherein at least a part of the surface is uneven. 2. A transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, an insulating covering material covering the electrodes and the transparent substrate, and another of the transparent substrate And a protective film formed on one side of the substrate. 3. The gas discharge panel substrate according to claim 2, wherein the insulating covering material has higher thermal conductivity than the dielectric glass sheet. 4. A transparent substrate, a pair of electrodes formed in one direction on one surface of the transparent substrate, an insulating covering material covering the electrodes and the transparent substrate, and the other of the transparent substrate A gas discharge panel substrate comprising a protective film formed on one surface of the substrate, and at least a part of the electrode surface is uneven. 5. The method according to claim 1, wherein the unevenness on the surface of the electrode is a surface roughness (R).
5. The gas discharge panel substrate according to claim 1, wherein a) is 0.5 μm to 5 μm. 6. The gas discharge panel substrate according to claim 1, wherein the transparent substrate is a glass sheet (50 μm or less). 7. The protective film is made of an alkali metal oxide, an alkaline earth oxide, or a mixture thereof.
7. The gas discharge panel substrate according to any one of 6. 8. The gas discharge panel substrate according to claim 1, wherein the protective film is made of MgO or Al ₂ O ₃ . 9. The gas discharge panel substrate according to claim 1, wherein the electrodes are composed of a transparent electrode and a metal electrode. 10. A gas discharge panel substrate according to claim 1, wherein a third electrode, a dielectric covering the electrode, and a partition formed for distinguishing each pixel are formed. A gas discharge panel comprising: an insulating substrate, wherein the electrodes of the gas discharge panel substrate and the insulating substrate are opposed to each other so as to be orthogonal to each other. 11. The gas discharge panel substrate and the insulating substrate are joined via a partition.
0 gas discharge panel. 12. A gas discharge panel according to claim 10 or 11, a display electrode drive circuit connected to a plurality of electrodes for driving said gas discharge panel, and each pixel of said gas discharge panel. A gas discharge panel display device, comprising: an address electrode drive circuit connected to the address electrodes of (1), and a control unit for controlling each of the display electrode drive circuit and the address electrode drive circuit.