Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1998-02-02
2001-04-10
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S586000, C313S587000
Reexamination Certificate
active
06215246
ABSTRACT:
BACKGROUND OF THE INVENTION
A. Field of the Invention
The present invention relates to a PDP (Plasma Display Panel) and, more particularly, to a PDP substrate structure and its fabricating method.
B. Description of the Prior Art
A general color PDP, as shown in
FIG. 1
, has upper and lower structures. The upper structure comprises an upper substrate
1
, a sustain electrode
3
formed on the upper substrate, a dielectric layer
4
for maintaining the surface charge generated during a discharge of the sustain electrode
3
, and a protection layer
5
. The lower structure comprises a lower substrate
2
, and an address electrode
6
formed on the lower substrate
2
. Barriers
7
coated with phosphor
8
are formed between the upper and lower substrates
1
and
2
. A frit glass
9
is formed at the glass end portion, combining the upper and lower substrates
1
and
2
.
Reference numeral
10
indicates a discharging gas sealed in a space between the upper and lower structures.
It is considered that the PDPs are the most suitable flat display device because they can display images at high speed and allow the manufacture of large-sized panels. In the past, AC and DC type PDPs having two electrodes have been used, and out of the two types of PDP, a surface discharge type AC PDP is considered to be the more suitable device for a color display.
To manufacture a conventional PDP, a pattern is first formed on the upper substrate
1
that has transparent electrodes. The side end portions of the transparent electrodes are coated with a metal that exhibits lower resistance than the transparent electrodes, so that the line resistance between the end portions of the electrodes can be reduced and thereby the quality deterioration of the sustain electrode
3
due to a driving voltage drop can be prevented. In another method of manufacturing the PDP, opaque metal electrodes are used instead of the transparent electrodes, and the dielectric layer
4
is formed on the whole surface of the electrodes to restrict the discharging current. The protection layer
5
is deposited on the whole surface, generally by an E-beam deposition using magnesium oxide, in order to protect the dielectric layer
4
against a sputtering that occurs during a discharge of the dielectric layer
4
.
An electrode is formed vertically with respect to the two electrodes on the lower substrate
2
, and barriers
7
are deposited between the electrodes so as to prevent a mis-discharge in the adjacent discharge regions. Between the upper and lower substrates
1
and
2
, combined with the frit glass
9
, is filled with the discharging gas
10
and sealed completely.
When a voltage is applied to the sustain electrode
3
and the address electrode
6
of the finished PDP, a discharge takes place in the discharge region
10
on the surface of the dielectric and protection layers
4
and
5
, generating ultraviolet rays.
While the electrons that exist in a discharge cell are accelerated toward the negative (−) electrode by the driving voltage applied, and collide with the mixture of inert gases filled in the discharge cell, the inert gases are excited to emit the ultraviolet rays.
The ultraviolet rays then collide with the phosphor
8
formed as thick as a predetermined thickness around the address electrode
6
and the barriers
7
, generating visible rays to display a color image.
However, the conventional plasma display panel presents some disadvantages in that the panel whose life is at most about 5,000 hours needs a structural improvement to secure long life more than 30,000 hours. Moreover, the protection layer is generally formed by E-beam deposition and such formation by E-beam deposition results in low productivity because of the need for complicated process such as vacuum and heat treatments and the expensive equipment required therefor, thus raising the unit cost of products.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a substrate structure of a plasma display panel and its fabricating method that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a plasma display panel, with long life and high luminance, by forming a protection layer that is inexpensive to make and excellent in voltage-resistance characteristic due to an improvement in its structure and manufacturing process thereof.
To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention comprises a first substrate; a second substrate opposite the first substrate and spaced a distance therefrom; a first electrode over the first substrate; a first dielectric layer over the first electrode; a protection layer over the first dielectric layer; a second electrode over the second substrate and facing the first electrode; a second dielectric layer over the second electrode; and a phosphor over the second dielectric layer and being isolated from the second electrode.
According to a further aspect, the invention comprises a first substrate; a second substrate opposite the first substrate and spaced a distance therefrom; a first electrode over the first substrate; a dielectric layer over the first electrode; a protection layer over the dielectric layer; an interfacial reaction preventive layer between the dielectric layer and the protection layer preventing interaction therebetween; and a second electrode over the second substrate and facing the protection layer.
According to another aspect, the invention comprises a first substrate; a second substrate opposite the first substrate and spaced a distance therefrom; a first electrode over the first substrate; a first dielectric layer over the first electrode; a second electrode over the second substrate and facing the first dielectric layer; a phosphor over the second electrode; and a second dielectric layer between the phosphor and second electrode isolating the phosphor and the second electrode from each other.
According to a still further aspect, the invention comprises a first substrate; a second substrate opposite the first substrate and spaced a distance therefrom; a first electrode over the first substrate; a first dielectric layer having a first dielectric constant over the first electrode; a second dielectric layer over the first dielectric layer, the second dielectric layer having a second dielectric constant different from the first dielectric constant; and a second electrode over the second substrate and facing the second dielectric layer.
According to a further aspect, the invention comprises a first substrate; a second substrate opposite the first substrate and spaced a distance therefrom; a first electrode over the first substrate; a preventive layer between the first substrate and the first electrode preventing a short-circuit between the first electrode and an adjacent electrode; a dielectric layer over the first electrode; and a second electrode over the second substrate and facing the dielectric layer.
According to yet another aspect, the invention comprises a first substrate; a second substrate opposite the first substrate and spaced a distance therefrom; a first electrode over the first substrate; a dielectric layer over the first electrode; a second electrode over the second substrate and facing the dielectric layer; and a preventive layer between the second electrode and the second substrate preventing a short-circuit between the second electrode and an adjacent electrode.
According to another aspect, the invention comprises a method of fabricating a plasma display device having a first substrate and a second substrate opposite the first substrate and spaced a distance therefrom, comprising: forming a first electrode over the first substrate; forming a dielectric layer over the first electrode; and spin coating a protection layer over the dielectric layer and facing the second substrate.
According to a further aspect, the invention comprises a method of fabricating a plasma display panel ha
Kim Gun-Woo
Kim Jin-Young
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
LG Electronics Inc.
Patel Ashok
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