JP2001307639A - Gas discharge panel and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To attempt to erase generated space charge, the space charge is erased as intended, or accidental discharge occurs due to the movement of the wall charge during scanning, resulting in deterioration of image quality. cause. SOLUTION: By providing an isolated electrode or adopting a configuration in which a part of an address electrode is exposed on a dielectric, the accumulated charge is made uniform or the accumulated charge is leaked through an exposed portion. This greatly reduces the probability of erroneous discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas discharge panel and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, among display devices used in computers, televisions and the like, a plasma display panel (PDP) has been attracting attention as a device that can be large, thin, and lightweight. Therefore, demands for high-definition PDPs are increasing.

FIG. 6 shows a conventional general AC type (AC type).
It is a schematic sectional drawing which shows an example of PDP. In this figure,
Display electrodes 22 and 23 are formed on a front glass substrate 21, and the display electrodes are covered with a dielectric glass layer 24 and a dielectric protection layer 25 made of magnesium oxide (MgO) (for example, Japanese Patent Application Laid-Open No. 5-3421991). Gazette). An address electrode 28 and a partition 30 are provided on the rear glass substrate 27, and each color (red,
(Green, blue) phosphor layers 31 to 33 are provided.

The front glass substrate 21 is a rear glass substrate 27
The discharge gas is sealed between the two substrates to form a discharge space. In this PDP,
In the discharge space, vacuum ultraviolet rays (mainly wavelength 14
7 nm), and each color phosphor layer is excited and emits light, whereby color display is performed.

In driving the PDP, a Y electrode which is a scan electrode of a display electrode pair (hereinafter referred to as an X electrode and a Y electrode) which generates a surface discharge on a glass substrate of a front plate and an address formed on a rear plate. Plasma discharge is generated between the electrodes and space charges are generated, which are accumulated on the dielectric on the X and Y electrodes. Next, a sustain voltage is applied between the X and Y electrodes, and a sustain discharge is performed in a selected cell using the accumulated wall charges.

[0006] The PDP can be manufactured as follows.

A display electrode is formed by applying and firing a silver paste on a front glass substrate, a dielectric glass paste is applied and fired to form a dielectric glass layer, and a protective layer is formed thereon.

[0008] A silver paste is applied on the rear glass substrate.
Baking is performed to form an address electrode, a glass paste is applied at a predetermined pitch, and baked to form a partition. Then, a phosphor layer is formed by applying a phosphor paste of each color between the partition walls and baking it at about 500 ° C. to remove resin components and the like in the paste.

After firing the phosphor, a glass frit for sealing is applied around the rear glass substrate, and calcined at about 350 ° C. to remove resin components and the like in the formed sealing glass layer. Thereafter, the front glass substrate and the rear glass substrate are stacked so that the display electrode and the address electrode face each other at right angles. Then, this is heated to a temperature (about 450 ° C.) higher than the softening temperature of the glass to be sealed to seal. Thereafter, while the sealed panel is heated to about 350 ° C., air is exhausted from an internal space formed between the two substrates (a space formed between the front plate and the rear plate and facing the phosphor), and the exhaust is completed. Thereafter, the discharge gas is brought to a predetermined pressure (usually 40
kPa to 66.5 kPa (300 to 500 Torr))
Introduce so that.

[0010]

However, in the above-described conventional method, the space charges generated are not erased as intended even if the space charges are intended to be erased, or the wall charges move accidentally due to scanning. Occurs, causing deterioration of image quality.

In order to solve the above problems, the gas discharge panel according to the present invention has a structure in which the accidental discharge is prevented by eliminating or evenly distributing the accumulated charges which cause the accidental discharge.

[0012]

According to the present invention, there is provided an electrode which is isolated between a discharge space and an address electrode by sandwiching a dielectric covering the address electrode, whereby an address electrode and a dielectric surface are separated from each other. In addition to reducing the capacitance formed between them, the capacitance between the dielectric surface and the isolated electrode becomes very large. At this time, the potential distribution of the isolated electrode greatly affects the distribution of electric charges on the dielectric surface, but by making the isolated electrode uniform, the potential distribution on the dielectric surface becomes uniform. As a result, it is possible to expect an effect on the uniformization of the accumulated charges causing the erroneous discharge, and the probability of erroneous discharge is greatly reduced.

Further, by adopting a configuration in which a part of the address electrode is exposed on the dielectric, an effect that unnecessary charges are leaked through the exposed portion can be expected, thereby reducing the probability of erroneous discharge. Greatly reduced.

[0014]

Embodiments of the present invention will be described.

FIG. 1 is a sectional view of a back plate of a gas discharge panel showing a first embodiment of the present invention. A reflective layer dielectric 6 is formed on a back glass substrate 7 and an address electrode 5
Is arranged. A dielectric layer 4 is formed so as to cover this, and a partition 1 is provided on the dielectric, and a space defined by the partition is filled with the phosphor 2. Here, an isolated electrode 3 which is DC-isolated from any other electrode is provided in the dielectric layer.

By adopting such a configuration, the capacitance between the address electrode 5 and the dielectric surface can be reduced, and the capacitance between the dielectric surface and the isolated electrode can be extremely low. And the potential distribution of the isolated electrode has a very large effect on the distribution of charges on the dielectric surface. At this time, by making the isolated electrode a uniform potential distribution, the potential distribution on the dielectric surface becomes nearly uniform, which can be expected to be effective in equalizing the accumulated charge that causes erroneous discharge. The probability can be greatly reduced.

By changing such a structure to the structure shown in FIG. 2 and exposing a part of the structure to the surface of the dielectric, the effect can be expected to be further enhanced. As for the distribution of the isolated electrodes 3, as shown in FIG.
It is desirable that the arrangement is limited to a portion overlapping with the address electrode 5 to enhance the effect, and that at least the isolated electrodes 3 in a region partitioned by the same partition wall 1 have the same potential. Further, it is desirable to provide a mechanism that can ground the isolated electrode 3 by providing an electrode that pulls out the isolated electrode 3 to the end face of the panel and takes out the electrode at the end face, and the like. It is desirable to ground the subframe at the same time as the subframe is initialized.

Further, in such an isolated electrode, the intensity of the displayed light is increased by making the reflection coefficient of visible light and / or ultraviolet light on the display surface side at least larger than that of the dielectric surface. A secondary effect can be expected.

FIG. 4 is a sectional view of a back plate of a gas discharge panel according to a second embodiment of the present invention. An address electrode 5 is disposed on a reflective glass dielectric formed on a back glass substrate 7. The dielectric layer 4 is formed so as to cover this, and at this time, the thickness of the part of the address electrode 5 is made larger than the thickness of the dielectric layer 4 so that the conductor protrusion 8 is formed.
Is formed, a part of the address electrode 5 can be exposed on the dielectric. As a result, it is possible to expect an effect that the electric charge accumulated more than necessary leaks through the exposed portion, thereby greatly reducing the probability of erroneous discharge.

In addition, as shown in FIG. 5, it is desirable that the exposed position is adjusted to a location where the sustain discharge is generated on the front panel, and is exposed only in a limited area including at least the location.

In both embodiments, the phosphor surface, on which the electric charge is considered to be accumulated most on the back plate, has a relatively large resistance and a certain degree of conductivity, so that the surface is more than necessary. Can be expected to have the effect of appropriately leaking the charge stored in the memory.

More specifically, it can be realized by mixing a certain amount of conductive powder or the like into the phosphor at a predetermined ratio, or forming a thin metal on at least a part of the surface of the phosphor powder. The phosphor layer may be formed after forming the coating.

Further, in the case where the surface chargeability and the charge storage characteristics are different for each of the three color phosphor materials, the amount of the conductor is increased for the phosphors of the type that tend to increase the charge storage to increase the surface resistance. The effect of preventing the margins for each color from differing by reducing the amount of conductors and increasing the surface resistance of phosphors of a type that tends to have smaller charge accumulation Can also be expected.

When the gas discharge panel having the structure of each embodiment is manufactured, the back plate of the gas discharge panel is formed up to the formation of the base using a conventional method and the like. After the electrodes are first formed by the above-described method, after forming with a different mask capable of forming only a portion thicker than the normal electrode thickness, the back plate can be manufactured again by a conventional method or the like. Note that a conventional method may be used for sealing or the like, but is not limited thereto.

[0025]

As described above, according to the present invention, a reduction in erroneous discharge can be expected by eliminating excessive concentration of wall charges on the dielectric of the back plate, and as a result, an effect of improving display quality can be expected. Can be expected.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a back plate showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a back plate when a part of an isolated electrode is thick in the first embodiment of the present invention.

FIG. 3 is a schematic front view of the first embodiment of the present invention when isolated electrodes are distributed in a plane direction.

FIG. 4 is a cross-sectional view of a back plate showing a second embodiment of the present invention.

FIG. 5 is a schematic front view of the second embodiment of the present invention in which exposed portions of address electrodes are distributed in a plane direction.

FIG. 6 is a schematic cross-sectional view showing an example of a conventional AC (AC) PDP.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Partition wall 2 Phosphor 3 Isolated electrode 4 Dielectric layer 5 Address electrode 6 Reflection layer 7 Back glass substrate 8 Conductor protrusion 9 X-electrode 10 Y-electrode

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshiki Sasaki, Inventor 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Terms (reference) 5C027 AA02 5C040 FA01 FA04 GB03 GB14 GC02 GC03 GC10 GC11 GC19 GG01 GG03 JA12 KB15 KB17 MA17 MA20

Claims (18)

[Claims] 2. A gas discharge panel according to claim 1, wherein said gas discharge panel has an electrode which is DC-isolated from said address electrode between said address electrode and said discharge space. 2. The gas discharge panel according to claim 1, wherein a part or all of the isolated electrode is embedded in a dielectric or a mixture of dielectrics covering the address electrode. 3. The gas discharge panel according to claim 1, wherein the isolated electrode is disposed only at a position overlapping the address electrode when viewed from the display surface side. 4. The gas discharge panel according to claim 1, further comprising an electrode for drawing out the isolated electrode to an end face of the panel and extracting the isolated electrode to the outside at the end face. 5. The gas discharge panel according to claim 4, wherein the isolated electrode is grounded in response to the initialization time of each frame and subframe in the gas discharge panel. 6. The gas discharge panel according to claim 5, wherein a resistance component is interposed between the isolated electrode and the ground terminal when the isolated electrode is grounded. 7. A gas discharge panel having an isolated electrode that is DC-electrically isolated from the address electrode between the address electrode and the discharge space, wherein visible light or ultraviolet light is present on the surface of the isolated electrode on the discharge space side. A gas discharge panel having a higher light reflection coefficient than a dielectric surface. 8. A gas discharge panel having an isolated electrode which is DC-electrically isolated from the address electrode between the address electrode and the discharge space, wherein visible light or ultraviolet light is present on the surface of the isolated electrode on the discharge space side. The gas discharge panel according to any one of claims 2 to 6, wherein a reflection coefficient of light is higher than a dielectric surface. 9. The gas discharge panel according to claim 1, wherein the thickness of at least a part of the address electrode is larger than the thickness of a dielectric covering the address electrode. 10. The gas discharge panel according to claim 9, wherein the thickness of the address electrode is greater than the thickness of the dielectric covering the address electrode only at the position where the address electrode crosses the electrode. 11. The gas discharge panel according to claim 9, wherein the thickness of the address electrode is larger than the thickness of the dielectric covering the address electrode only at the position where the front electrode crosses the scanning electrode. 12. The gas discharge panel according to claim 9, wherein a phosphor is not applied to the position of the electrode which is thicker than the dielectric. 13. A gas discharge panel, wherein the phosphor has conductivity. 14. The gas discharge panel according to claim 1, wherein the phosphor has conductivity. 15. The gas discharge panel according to claim 14, wherein a conductive component is mixed into the phosphor to impart conductivity. 16. A gas discharge panel wherein the conductivity imparted to a phosphor is changed depending on the surface chargeability of each phosphor. 17. The gas discharge panel according to claim 1, wherein the conductivity imparted to the phosphor is changed depending on the surface charging property of each phosphor. 18. In the step of forming an address electrode on a back plate of a gas discharge panel, when patterning the electrode,
A method for manufacturing a gas discharge panel, wherein patterning is performed at least twice using exposure masks having different shapes.