Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1998-06-25
2001-01-09
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S587000
Reexamination Certificate
active
06172461
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a color plasma display panel(called “PDP”), and more particularly, to a top electrode in a color plasma display panel which has a large discharge region between a sustain electrode and a scan electrode.
2. Discussion of the Related Art
Being one of luminous devices for displaying an image using a gaseous discharge in a cell, the PDP, in general, is spot lighted as an image display device directed to a large sized, direct view type image display device, particularly to an HDTV (High Definition TeleVision) era because it has a very simple fabrication process, easy to fabricate a large sized device and has a fast response.
FIG. 1
illustrates a cross section of a unit cell of a background art PDP, wherein, for convenience of understanding, sustain electrodes
11
and
11
′ on the top glass substrate
10
are turned at 90° from a direction of an address electrode
15
on a bottom glass substrate
14
.
Referring to
FIG. 1
, the background art PDP is provided with the top glass substrate
10
for displaying an image, the bottom glass substrate
14
spaced from, and disposed in parallel with the top glass substrate
10
, a plurality of partition walls
16
disposed between the bottom glass substrate
14
and the top glass substrate
10
at fixed intervals, and a plurality of discharge spaces formed by jointing of the top glass substrate
10
and the bottom glass substrate
14
. The PDP is provided with an address electrode
15
on the bottom glass substrate
14
between each of the plurality of partition walls
16
, a fluorescent film
17
formed on both sides of the partition walls
16
and on the bottom glass substrate
14
to cover the address electrode
15
in an internal surface of each of the discharge spaces for emitting a visible light on discharge, and transparent electrodes
8
and
8
′ and bus electrodes
9
and
9
′ formed alternatingly at fixed intervals on the top glass substrate
10
at a surface facing the bottom glass substrate
14
. The transparent electrodes
8
and
8
′ and the bus electrodes
9
and
9
′ are formed on a central part of the bottom glass substrate
14
perpendicular to the address electrode
15
, dividing a screen of the PDP into a plurality of cells. And, there are a dielectric film
12
on the transparent electrodes
8
and
8
′ and the bus electrodes
9
and
9
′ for restricting a discharge current and a protective film
13
on the dielectric film
12
for protecting the transparent electrodes
8
and
8
′, the bus electrodes
9
and
9
′ and the dielectric film
12
, and a mixture of inert gases, i.e., helium He as a major gas added with xenon Xe and neon Ne filled in each of the discharge spaces at 400~500 torr. The mixture gas induces penning effects when discharge in the cells.
A process of image display on the unit cell of the aforementioned background art PDP will be explained.
Upon application of a discharge voltage to the sustain electrodes
11
and
11
′ to cause a surface discharge, space charges generated in the cell accelerate micron electrons in the discharge gas to collide on neutral particles, which causes another collision, accelerating ionization of the neutral particles, converting the discharge gas into a plasma and emitting a vacuum ultraviolet ray. This vacuum ultraviolet ray excites the fluorescent film
17
, to generates a visible light, which is shot outwardly through a display surface of the top glass surface
10
. Thereafter, by keeping the application of the sustain voltage to the transparent electrodes
8
and
8
′ for a certain time period, a sustained discharge between the sustain electrodes
11
and
11
′ is caused, and by keeping each cell luminous for a certain time period, an image can be displayed.
FIG. 2
illustrates a plan view of a top electrode in a background art PDP.
Referring to
FIG. 2
, the PDP is provided with a plurality of partition walls
16
and one pair of transparent electrodes
8
and
8
′ and bus electrodes
9
and
9
′ formed at fixed intervals on a top glass substrate perpendicular to the partition walls
16
. One pair of sustain electrodes
11
and
11
′ having the transparent electrodes
8
and
8
′ and the bus electrodes
9
and
9
′ include one pair of tooth formed projections
20
-
1
and
20
-
2
perpendicular to an address electrode(not shown) on a bottom glass substrate(not shown) and causes an entire screen divided into a plurality of cells. The pair of sustain electrodes
11
and
11
′ are formed of deposition of indium oxide InO
2
or tin oxide SnO
2
, which are transparent. The tooth formed projections
20
-
1
and
20
-
2
are formed opposite to each other with a gap of 50 &mgr;m~80 &mgr;m.
The operation of the aforementioned background art PDP will be explained additionally referring to the elements that is omitted from FIG.
1
.
Upon application of a sustain voltage to the sustain electrodes
11
and
11
′, wall charges are generated at ends of the pair of tooth formed projections
20
-
1
and
20
-
2
, which cause a surface discharge within the discharge cell. The surface discharge causes another surface discharge in a discharge region
18
at surfaces of the dielectric film
12
and the protection film
13
, that, in turn, generates a vacuum ultraviolet ray
19
which excites the fluorescent material in the fluorescent film
17
, exhibiting a color.
However, since a structure of the top glass electrode in the background art PDP does not allow to secure a large discharge region between the sustain electrodes, implementation of a color PDP of a high luminance has been difficult.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a top electrode in a color plasma display panel 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 top electrode in a color plasma display panel which has a high luminance and efficiency.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the top electrode in a plasma display panel having a top glass substrate includes sustain electrodes and scan electrodes formed on the top glass substrate arranged in parallel at fixed intervals, one pair of discharge electrodes formed in prescribed regions of the sustain electrodes and the scan electrodes projected in one direction respectively, for easy cell discharge, and a dielectric film and a protection film for protection of the sustain electrodes, the scan electrodes and the one pair of discharge electrodes.
In other aspect of the present invention, there is provided a plasma display panel including a top panel including, sustain electrodes and scan electrodes formed on the top glass substrate arranged in parallel at fixed intervals, one pair of discharge electrodes formed in prescribed regions of the sustain electrodes and the scan electrodes projected in one direction respectively for easy cell discharge, and a dielectric film and a protection film for protection of the sustain electrodes, the scan electrodes and the one pair of discharge electrodes, and a bottom panel including address electrodes formed on a bottom glass substrate spaced a distance from, and parallel to the top panel, a plurality of partition walls arranged on a surface opposite to the top glass substrate at fixed intervals, and fluorescent films on the address electrodes and on the partition walls.
It is to be understood that
Fleshner & Kim LLP
LG Electronics Inc.
Patel Ashok
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