Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1997-03-06
2001-06-05
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S586000, C313S584000, C313S585000, C313S587000
Reexamination Certificate
active
06242860
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display panel (PDP) and a method of manufacturing such a plasma display panel, and more particularly to a plasma display panel structure for preventing random discharges of a three-electrode-surface-discharge AC plasma display panel and a method of manufacturing such a plasma display panel structure.
2. Description of the Prior Art
Surface-discharge AC plasma display panels have been drawing attention in the art for use as large-screen full-color display devices. A three-electrode-surface-discharge AC plasma display panel has a plurality of parallel display electrodes (hereinafter referred to as X and Y electrodes) disposed on a glass substrate, for generating surface discharges, and address electrodes and phosphor layers which are disposed on an opposite glass substrate, the address electrodes extending perpendicularly to the X and Y electrodes. The three-electrode-surface-discharge AC plasma display panel is basically operated by resetting itself with a large voltage applied between the X and Y electrodes, causing a discharge between the Y electrodes, which serve as scan electrodes, and the address electrodes, and applying a sustain voltage between the X and Y electrodes, producing a sustain discharge depending on the luminance of an image to be displayed based on stored wall charges.
As described later on, space charges are produced as a result of a plasma discharge that occurs between the Y electrodes and the address electrodes, and mostly stored on a dielectric layer disposed on the X and Y electrodes. Part of the generated space charges is used as an ignition voltage for a writing discharge to occur between a next scan electrode and a Y electrode.
Part of the generated space charges moves with the scanning process until it is stored in the vicinity of first and last scan electrodes. As a result, a random discharge is produced under a large voltage due to the stored charges, degrading the quality of an image displayed on the plasma display panel. Though this phenomenon has not clearly been analyzed and understood in the art, it has been confirmed, at least, that it is caused by charges which are not utilized for a sustain discharge and are stored over the address electrodes.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a plasma display panel structure preventing random discharges from occurring and a method of manufacturing such a plasma display panel structure.
Another object of the present invention is to provide a plasma display panel structure eliminating a stored charge which would otherwise be responsible for random discharges on a dielectric layer on address electrodes and a method of manufacturing such a plasma display panel structure.
Still another object of the present invention is to provide a plasma display panel structure leaking a stored charge which would otherwise be responsible for random discharges on a dielectric layer on address electrodes and a method of manufacturing such a plasma display panel structure.
Further, another object of the present invention is to provide a plasma display panel preventing a latch-up phenomenon causing address electrodes malfunction according to a discharge of the accumulated charge and a method of manufacturing such a plasma display panel.
To achieve the above objects, there is provided in accordance with the present invention a plasma display panel comprising a first substrate having a plurality of address electrodes disposed thereon and a first dielectric layer disposed thereon and covering the address electrodes; and a second substrate having a plurality of scan electrodes disposed thereon in a direction transverse to the address electrodes and a second dielectric layer disposed thereon and covering the scan electrodes. The first substrate and the second substrate are disposed in confronting relation to each other with discharge spaces defined therebetween, the first dielectric layer containing electrically conductive particles mixed therewith.
The electrically conductive particles make the first dielectric layer electrically conductive to allow charges generated by a plasma discharge and stored on the first dielectric layer to leak to the address electrodes for thereby preventing a storage of excessive charges which would otherwise lead to random discharges.
The electrically conductive particles are preferably made of either chromium or nickel, as metal particles, which are difficult to be oxidized. Further, the conductive particles may be a conductive oxide material. In such material, it is preferable to be a semiconductor material which is a metal oxide, like indium oxide, tin oxide, titanium oxide and etc., which is doped with impurities.
According to the present invention, the above objects can also be accomplished by a method of manufacturing a plasma display panel, comprising the steps of mixing electrically conductive particles having a predetermined diameter with glass of low melting point, coating and baking a layer of the glass of low melting point mixed with the electrically conductive particles on a first substrate which has a plurality of address electrodes disposed thereon, thereby to form a first dielectric layer on the first substrate, combining the first substrate in confronting relation with a second substrate which has a plurality of scan electrodes disposed thereon in a direction transverse to the address electrodes and a second dielectric layer covering the scan electrodes, filling a discharge gas between the first substrate and the second substrate, and sealing the first substrate and the second substrate with respect to each other.
The above and other objects, features, and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate a preferred embodiment of the present invention by way of example.
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Awaji Noriyuki
Betsui Keiichi
Nakahara Hiroyuki
Nanto Toshiyuki
Otsuka Akira
Fujitsu Limited
Patel Ashok
Staas & Halsey , LLP
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