Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
2002-06-25
2004-08-31
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S581000
Reexamination Certificate
active
06784615
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display panel used as a flat display for a television receiver, a computer, and a like, and a method of manufacturing the plasma display panel (PDP), and more particularly, relates to an AC (Alternating Current) driving surface discharge type of plasma display panel and a method of manufacturing the AC driving surface discharge type of plasma display panel.
The present application claims priority of Japanese Patent Application No. 2001-191765 filed on Jun. 25, 2001, which is hereby incorporated by reference.
2. Description of Related Art
FIG. 7
is a perspective exploded view showing a schematic structure of a conventional AC driving surface discharge type of Plasma Display Panel (hereinafter referred to as PDP)
1
in that a part of the front insulation substrate
2
is cut out.
FIG. 8
is a top view showing a state in that a front insulation substrate
2
of the PDP
1
is removed.
FIG. 9
is an enlarged sectional view showing a section along a line A-A′ in FIG.
8
. The PDP
1
is disclosed in Japanese Patent No. 3036496, Japanese Patent Application Laid-open No. Hei 11-202831, and a like.
In the PDP
1
, as shown in
FIG. 7
to
FIG. 9
, under the front insulation substrate
2
, a plurality of pairs of sustaining electrodes
3
a
and sustaining electrodes
3
b
of each extending in a row direction (in a horizontal direction in
FIG. 8
) are arranged in a column direction (in a vertical direction in
FIG. 8
) at predetermined intervals so that a discharge gap
4
is put between each pair. The front insulation substrate
2
is made of soda lime glass or a like so as to have a thickness of 2 mm to 5 mm similarly to a back insulation substrate
8
which will be described later. Both of the sustaining electrode
3
a
and the sustaining electrode
3
b
are made up of transparent conductive thin films such as tin oxide, indium oxide, and ITO (Indium Tin Oxide) and form a surface discharge electrode pair
3
.
A plurality of pairs of bus electrodes
5
a
and bus electrodes
5
b
are respectively formed on low surfaces of the plurality of pairs of sustaining electrodes
3
a
and sustaining electrodes
3
b
at one side of each end. The bus electrodes
5
a
and the bus electrodes
5
b
are made up of metal films such as thick films of silver, or thin films of aluminum or copper and are formed in order to make resistance values of the sustaining electrode
3
a
and the sustaining electrode
3
b
of which each electrical conductivity is low. Respective lower faces on which no sustaining electrode
3
a
and no sustaining electrode
3
b
and no bus electrode
5
a
and no bus electrode
5
b
are formed in the front insulation substrate
2
are covered by a dielectric layer
6
which is transparent. The dielectric layer
6
is made of low melting point glass of which a thickness is 10 &mgr;m to 40 &mgr;m. A protection layer
7
is formed on the lower face of the dielectric layer
6
in order to protect the dielectric layer
6
from ion impacts during discharge. The protection layer
7
is made of magnesium oxide or a like of which a secondary emission coefficient is large and of which a sputtering-resistance is good, and formed by vacuum deposition or a like so as to have a thickness of 0.5 &mgr;m to 2.0 &mgr;m.
On the other hand, a plurality of data electrodes
9
in stripe shapes extending in a column direction, namely, in a direction perpendicular to formation direction of the sustaining electrodes
3
a
and the sustaining electrodes
3
b
are formed at predetermined intervals. The data electrode
9
is made up of a silver film or a like. Respective upper faces of the data electrodes
9
and the back insulation substrate
8
on which no data electrodes
9
are formed are covered by a white dielectric layer
10
. On the dielectric layer
9
except the data electrode
9
, a plurality of division walls
13
for separating display cells
12
are formed in the column direction. The display cell
12
is a minimum unit for forming a display screen. In
FIG. 8
, an area surrounded by a dashed line indicates one of the display cells
12
.
Three fluorescent layers
14
R,
14
G, and
14
B for converting an ultraviolet ray which is generated by discharge of a discharge gas into three primary colors of red (R), green (G), and blue (B) of a visible light are formed on the upper face of the dielectric layer
8
on the data electrode
9
and on the side face of the division wall
13
. The fluorescent layers
14
R,
14
G, and
14
B are formed in order of the fluorescent layer
14
R, the fluorescent layer
14
G, and the fluorescent layer
14
B sequentially repeatedly in the row direction. The fluorescent layers (not shown) for each converting the ultraviolet ray into a visible light of a same color are formed continuously in the column direction.
Each discharge gas space
15
is kept in each space formed by the lower face of the protection layer
7
, each upper face of the fluorescent layers
14
R,
14
G, and
14
B, and two division walls
13
adjacent to each other. The discharge gas space
15
is filled with a discharge gas such as xenon, helium, or neon, or mixed gas thereof under pressure of 20 kPa to 80 kPa. An area including the sustaining electrode
3
a
and the sustaining electrode
3
b
, the bus electrode
5
a
and the bus electrode
5
b
, the data electrode
9
, the fluorescent layers
14
R,
14
G, and
14
B and the discharge gas space
15
makes the display cell
12
. When the size of the display cell
12
is 1.05 mm in the vertical direction (column direction) and 0.355 mm in the horizontal direction (row direction), the sustaining electrode
3
a
and the sustaining electrode
3
b
of which widths are 300 &mgr;m to 500 &mgr;m and of which thicknesses are 0.1 &mgr;m to 2.0 &mgr;m are made so as to have the discharge gap
4
of 50 &mgr;m to 300 &mgr;m therebetween.
Next, a method of forming the sustaining electrode
3
a
and the sustaining electrode
3
b
, and the bus electrode
5
a
and the bus electrode
5
b
included in the PDP
1
will be explained with reference to
FIG. 10A
to FIG.
10
E. The sustaining electrode
3
a
and the sustaining electrode
3
b
are formed by a lift-off method shown in
FIG. 10A
to FIG.
10
E.
FIG. 10A
to
FIG. 10E
are enlarged sectional views showing a side of the front insulation substrate
2
which is enlarged and is turned over up and down in a section along a line A-A′ in FIG.
8
. First, as shown in
FIG. 10A
, a photosensitive dry film
21
is laminated on the front insulation substrate
2
. The photosensitive dry film
21
includes a support film (not shown) and photosensitive resin (not shown) formed on the support film. Then, as shown in
FIG. 10B
, the photosensitive dry film
21
is exposed and developed to pattern the dry film
21
. Then, as shown in
FIG. 10C
, a transparent conductive thin film
22
is formed on the photosensitive dry film
21
which is patterned. Then, as shown in
FIG. 10D
, the sustaining electrode
3
a
and the sustaining electrode
3
b
of predetermined shapes are obtained by removing the photosensitive dry film
21
. Then, as shown in
FIG. 10E
, after pattern printing of silver paste (not shown) is applied onto the sustaining electrode
3
a
and the sustaining electrode
3
b
, the bus electrode
5
a
and the bus electrode
5
b
of predetermined shapes are obtained by annealing (for example, keeping 560° C. for thirty minutes).
Now, an outline principle in which one display cell
12
emits in the PDP
1
will be explained. First, when a voltage signal for keeping discharge is applied to the sustaining electrode
3
a
and the sustaining electrode
3
b
, a discharge generates in the discharge gas space
15
. Electrons which generate by this discharge are in collision with xenon atoms, helium atoms, neon atoms, or a like (hereunder, called only xenon atoms or a like), the xenon atoms or a like are excited or ionized. For example, excited xenon atoms generate ultraviolet rays of a vacuum ultraviolet area of 147 nm to
Okigawa Akifumi
Yoshioka Toshihiro
Lee Wilson
NEC Corporation
Tran Chuc
Young & Thompson
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