Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2001-04-25
2002-06-25
Vu, David (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169400, C313S485000, C313S495000
Reexamination Certificate
active
06411043
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Application No. 2000-22800, filed Apr. 28, 2000, in the Korean Industrial Property Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display panel, and more particularly, to an alternating-current (AC) type plasma display panel having improved partitions formed on a rear substrate of the panel.
2. Description of the Related Art
In general, a plasma display panel is a picture display device that provides desired figures, characters or graphics by injecting gases between two substrates having electrodes thereon, and exciting phosphors using ultraviolet (UV) rays generated by the discharged gases.
A plasma display panel is classified into a direct-current (DC) type and an alternating-current (AC) type according to the type of driving voltages applied to discharge cells (i.e., a discharge type) and is also classified into an opposite discharge type and a surface discharge type according to the arrangement type of electrodes.
A DC type plasma display panel is constructed such that all electrodes are exposed to a discharge space such that a migration of charges directly occurs between the corresponding electrodes. On the other hand, an AC type plasma display panel is constructed such that at least one electrode is covered by a dielectric layer, and there is no direct migration of charges between the corresponding electrodes. Instead, ions and electrons produced by the discharge adhere to the surface of the dielectric layer to form wall charges. In addition, sustained discharges (i.e., sustaining discharges) are allowed by a sustaining voltage.
In an opposite discharge plasma display panel, an address electrode and a scan electrode are opposed to each other at each unit pixel, and an addressing discharge and a sustaining discharge occur between the two electrodes. On the other hand, in a surface discharge plasma display panel, an address electrode, and common and scan electrodes, which correspond with the address electrode, are provided for each unit pixel to cause the addressing discharge and the sustaining discharge.
FIG. 1
illustrates a first conventional AC type plasma display panel
10
. The plasma display panel
10
has a front substrate
11
and a rear substrate
12
opposed to and facing each other. Strip-shaped common electrodes
13
and strip-shaped scan electrodes
14
are alternately formed on a bottom surface of the front substrate
11
. A bus electrode
15
, which reduces the line resistance, is formed on a bottom surface of each of the common and scan electrodes
13
and
14
. A first dielectric layer
16
is formed on a bottom surface of the front substrate
11
to cover the common electrodes
13
, the scan electrodes
14
, and the bus electrodes
15
. A protective layer
17
, such as a magnesium oxide (MgO), is formed on a bottom surface of the first dielectric layer
16
.
Strip-shaped address electrodes
18
are formed on a top surface of the rear substrate
12
to be perpendicular with the common and scan electrodes
13
and
14
. The address electrodes
18
are covered by a second dielectric layer
19
. Strip-shaped partitions
100
are formed on the second dielectric layer
19
parallel with the address electrodes
18
. Red (R), green (G) and blue (B) phosphor layers
110
are formed on the inner walls of the partitions
100
.
In the conventional plasma display panel
10
having the aforementioned configuration, if a voltage is applied between the scan electrode
14
and the address electrode
18
, a preliminary discharge occurs to fill wall charges therebetween. In such a state, if a voltage is applied to the common electrode
13
and the scan electrode
14
, a glow discharge occurs to produce plasma, and (UV) rays generated by the plasma excite the phosphor layers
110
, thereby implementing a picture image.
The partitions
100
may be formed on the rear substrate
12
by a screen printing method, a sandblast method, or a dry film method. However, since the partitions
100
have the phosphor layers
110
of different colors formed on the inner walls and bottoms thereof, the amount of phosphors coated per unit area is small.
To overcome the problem caused by the small amount of phosphors, alternative partitions have been proposed.
FIG. 2
is a partially exploded diagram of a rear substrate
22
of a second conventional plasma display panel, and only the characteristic parts will be described herein.
Referring to
FIG. 2
, a plurality of address electrodes
28
are formed on the rear substrate
22
. The address electrodes
22
are covered by a dielectric layer (not shown). A matrix-type partition
200
is formed on the dielectric layer. The partition
200
includes first partitions
201
formed parallel to the address electrodes
28
, and second partitions
202
formed to be perpendicular with the address electrodes
28
. Accordingly, the space for partitioning discharge cells is defined by the first and second partitions
201
and
202
. R, G and B phosphor layers (not shown) are formed on the inner walls of the first and second partitions
201
and
202
.
The partition
200
has an increased phosphor layer coating area compared to the partition
100
shown in
FIG. 1
, which advantageously improves the luminance. However, in performing a vacuum exhausting step for removing impurities containing residual moisture being inside the panel, it is very difficult to attain exhaustion due to a closed structure of the partition
200
. Thus, the exhausting step is prolonged.
FIG. 3
is a partially exploded diagram of a rear substrate
32
of a plasma display panel, and only the characteristic parts will be described herein, like in FIG.
2
. As shown, a plurality of address electrodes
38
are formed on the rear substrate
32
. The address electrodes
38
may be covered by a dielectric layer (not shown). A plurality of meandering partitions
300
are formed on the dielectric layer to be parallel with the address electrodes
38
. Since the area where phosphor layers (not shown) are coated is increased in the partitions
300
, the luminance is somewhat improved during radiation of the light. However, since the partitions
300
are not of a strip shape, it is quite difficult to fabricate these partitions
300
.
Also, since the spaces defining the R, G and B discharge cells are not positioned along a line, it is quite difficult to drive the plasma display panel using the partitions
300
. Further, due to the meandering partitions
300
, it is difficult to form a black matrix, which is formed in the boundary of adjacent discharge cells for the purpose of enhancing color purity on the front substrate, at a desired position.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an AC type plasma display panel which can improve the luminance of phosphors while maintaining color purity by improving the structure of partitions formed on a rear substrate of the panel to increase the area where phosphor layers are coated.
It is another object of the present invention to provide an AC type plasma display panel which can facilitate exhaustion and driving by improving the structure of partitions comprising strip-shaped main partitions and auxiliary partitions.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Accordingly, to achieve these and other objects, there is provided an AC type plasma display panel including a front substrate, a plurality of strip-shaped common and scan electrodes formed on a bottom surface of the front substrate, bus electrodes formed along one side of respective edges of the common and scan electrodes, a first dielectric layer formed on the bottom surface of the front substrate to cover the common and scan electrodes, a protective layer formed on the bottom surface o
Jeong Jae-seok
Kang Tae-kyoung
Song Young-hwa
Samsung SDI & Co., Ltd.
Staas & Halsey , LLP
Vu David
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