Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1999-10-13
2002-05-07
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S582000
Reexamination Certificate
active
06384531
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display device, and more particularly, to a plasma display device having an improved structure by forming an electrode formed on a transparent front substrate using a conductive metal.
2. Description of the Related Art
A plasma display device forms a picture image by discharging a gas sealed between opposing substrates having a plurality of electrodes and exciting a phosphor by ultraviolet rays generated during the discharge.
The plasma display device is classified into a direct current (DC) plasma display device and an alternating current (AC) plasma display device depending on its discharge types. Also, the plasma display device is largely classified into an opposing discharge type and a surface discharge type depending on its electrode structure.
In the DC plasma display device, all electrodes are exposed to a discharge space, and charges move directly between the electrodes. In the AC plasma display device, at least one electrode is surrounded by a dielectric layer and a discharge occurs due to an electrical field of wall charges.
FIGS. 1 and 2
show an example of a conventional surface discharge type plasma display device.
Referring to the drawing, first electrodes
11
as an address electrode are formed in strips on a rear substrate
10
. A dielectric layer
12
formed on the rear substrate
10
is coated on the first electrode
11
. Partitions
13
for defining a discharge space and preventing electrical and optical crosstalk between neighboring discharge cells are formed on the dielectric layer
12
so as to be parallel to the first electrode
11
.
A front substrate
16
is coupled above the partition
13
. On the lower surface of the front substrate
16
, second electrodes
14
as scanning electrodes and third electrodes
15
as common electrodes are alternately formed to be perpendicular to the first electrodes
11
The second and third electrodes
14
and
15
are formed of transparent materials, and bus electrodes
14
a
and
15
a
for reducing line resistance of the second and third electrodes
14
and
15
are respectively provided thereon.
Also, on the lower surface of the front substrate
16
, a dielectric layer
17
and a protective layer
18
are sequentially formed so that the second and third electrodes
14
and
15
are buried therein. A fluorescent layer
19
is coated at at least one side of the discharge space defined by the partitions
13
.
In the plasma display device thus constructed, since the second and third electrodes
14
and
15
are formed of transparent ITO, an ITO film forming and patterning processes are necessary. ITO, however the conductivity is rather poor so that the operating voltage level must be high. One conventional way to solve the problem of poor conductivity is to form bus electrodes
14
a
and
15
a
on top of the second and third electrodes made of transparent ITO. Forming a bus electrode makes the PDP manufacturing process more complicated, thus increasing the cost. As an alternative, U.S. Pat. No. 5,640,078 (Amemiya) discloses ITO-electrodes having protrusions at every emitting pixel in order to decrease the amount of current flowing in the electrodes. However, prior art PDPs using ITO-based electrodes have not been able to fully overcome their inherent poor conductivity problem, and as a result, there is a problem in that power consumption is high, which is a major drawback in PDPs, in addition to the problem of high costs for the ITO material.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a plasma display device with an improved structure, capable of obviating the need for transparent electrodes.
Accordingly, to achieve the above object, there is provided a plasma display device including front and rear substrate disposed parallel to and facing each other, first electrodes formed in strips on the rear substrate, second and third electrodes formed of a conductive metal in strips on the lower surface of the front substrate so as to be perpendicular to the first electrodes, and at least one auxiliary electrode formed adjacent to the second and third electrodes.
Here, the auxiliary electrode is formed of a conductive metal.
According to another aspect of the present invention, there is provided a plasma display device including front and rear substrate disposed parallel to and facing each other, first electrodes formed in strips on the rear substrate, second and third electrodes formed of a conductive metal in strips on the lower surface of the front substrate so as to be perpendicular to the first electrodes, and auxiliary electrode portions extending from at least one of the second and third electrodes and formed therebetween.
REFERENCES:
patent: 5243252 (1993-09-01), Kaneko et al.
patent: 5640068 (1997-06-01), Amemiya
patent: 6008580 (1999-12-01), Nakamura et al.
patent: 6051923 (2000-04-01), Pong
patent: 6157354 (2000-12-01), Amemiya
Mun Seung-pil
Nam Joong-woo
Park Deuk-il
Berck Kenneth A
Lowe Hauptman & Gilman & Berner LLP
Samsung Display Devices Co. Ltd.
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