Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2002-05-28
2003-09-16
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C445S024000
Reexamination Certificate
active
06621231
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to a plasma display panel, and more particularly, to the structure of barrier ribs in the plasma display panel which can improve the whole luminescence and a white balance, simplify processes of manufacturing it, and enhance working steadiness and the reliability of the post process by complementing the different emission characteristics among three Kinds(R, G, and B) of phosphors to be used in the plasma display panel.
BACKGROUND ART
FIG. 1
illustrates a schematic partial sectional view of a conventional plasma display panel. As shown in
FIG. 1
, the plasma display panel comprises a first substrate
11
and a second substrate
21
faced parallel to each other, and barrier ribs
25
formed to maintain the constant distance between the first substrate
11
and the second substrate
21
and to define a discharge space
30
. Discharge gas such as Xe, Ne, He, etc., is filled in the discharge space
30
. A plurality of first substrate electrodes are arranged in a spaced and parallel relationship to each other on the surface of the first substrate
11
which opposes to the second substrate
21
, said first substrate electrodes being formed of complex electrodes
12
,
14
,
13
and
15
which consist of transparent electrodes
12
,
13
and metal electrodes
14
and
15
. A dielectric layer
17
and a MgO protective layer
18
are formed thereon in order. Said discharge space
30
defines a plurality of discharge cells and black stripes
16
can also be formed between the adjoining discharge cells.
A plurality of address electrodes
22
are arranged in a spaced and parallel relationship to each other on the surface of the second substrate
21
so as to define a plurality of discharge cells
10
at cross-points of the first substrate electrodes or the complex electrodes
12
,
14
and
13
,
15
. A dielectric layer
27
is formed so as to cover the address electrodes
22
, and a phosphor layer
24
is formed so as to cover the side walls of the barrier ribs
25
exposed to the discharging space
30
and the bottom surface of the discharging space
30
.
Also, an underlayer
23
may be formed between the address electrodes
22
and the second substrate
21
in order to prevent from being diffused and migrated into adjoining functional layers such as the electrodes, etc., and to enhance the printing characteristics of the functional layers.
By applying predetermined voltages between the complex electrodes
12
,
14
,
13
and
15
from an alternating current source and forming an electric field in such an alternating current plasma display panel, discharge is performed within each of the discharge cells
10
as a display element, which is separated to each other by the first substrate
11
, the second substrate
21
and the barrier ribs
25
. And, by ultraviolet rays which are generated during such discharge, the phosphor layer
24
emits visible light which penetrates the first substrate
11
and makes images. Also, the underlayer
23
and the dielectric layer
27
are formed on the second substrate
21
as shown in the illustrative example, but may not be formed if not necessary.
The transparent electrodes
12
and
13
of the first substrate
11
are formed by coating with ITO or SnO
2
and then patterning with the photo-etching technology, then the metal electrodes
14
and
15
are formed with Cr/Cu/Cr, Cr/Al/Cr, etc. The other structures such as the dielectric layer
17
, the black stripes
16
, the barrier ribs
25
, etc., are formed with the print technology such as a screen print technology, an offset print technology, etc., the sand blasting, the squeezing technology, the photo-etching technology, etc.
SUMMARY OF THE INVENTION
However, there is one problem in a dynamic margin since, among the phosphors generally used for the phosphor layer
24
in the plasma display panel, (Y,Gd)BO
3
:Eu of R phosphor and BaMgAl
10
O
17
:Eu of B phosphor have plus(+) charge characteristics, but Zn
2
SiO
4
:Mn of G phosphor has minus(−) charge characteristics, thereby making the discharge voltage higher.
There is also, another problem in that it is very difficult to control a white balance since the characteristics of the phosphors used in the phosphor layer
24
are different from each other as described above.
Meanwhile, in a structure of barrier ribs as illustrated in
FIGS. 2
a
and
2
b
, the barrier ribs are arranged in a stripe shape and the manufacturing process is simple, but it is a problem that visible light generated by the discharges is leaked out in the stripe direction of the barrier ribs.
Furthermore, in a matrix-structure of barrier rib as illustrated in
FIGS. 3
a
and
3
b
, it is possible to define each color cell, thereby improving the luminance, to block the leakage of light and to prevent crosstalk in all directions, but its manufacturing is very difficult due to the troublesome process.
Accordingly, in order to the above discussed problems, the present invention provides structures of barrier ribs in the plasma display panel which can improve the whole luminescence and a white balance, simplify processes of manufacturing it, and enhance working stability and the reliability of the post process by complementing the different emission characteristics among three kinds of phosphors(R, G, and B) to be used in the plasma display panel.
To achieve the above-mentioned object, in accordance with one embodiment of the present invention, there is provided a structure of barrier rib in a plasma display panel wherein images are displayed by emitting visible light from three kinds of phosphor(R, G, and B) layers between a plurality of barrier ribs using the discharge phenomenon caused by applying each pulse for scanning and displaying to a plurality of electrodes in order, said structure of barrier ribs being characterized by comprising at least one barrier rib of a half-matrix shape in which protrusions are formed between the barrier ribs.
Said structure of barrier rib further may comprise at least one connection portion to connect the barrier ribs, thereby comprising a matrix-shaped barrier rib in a portion. And, the protrusions in the opposite sides of the half-matrix-shaped barrier rib may be different in width, and/or the half-matrix-shaped barrier rib may be constituted in an arrangement such that widths of the protrusions in the same direction of the half-matrix-shaped barrier rib increase or decrease according to an arrangement of the three Kinds of phosphor(R, G, and B) layers.
Moreover, the half-matrix-shaped barrier rib and widths of the protrusions may be constituted different from each other based on a kind of the phosphor in the phosphor layers, and/or in a relationship with a position on a screen in the plasma display panel.
REFERENCES:
patent: 5906527 (1999-05-01), Shaikh et al.
patent: 5985460 (1999-11-01), Wang et al.
patent: 6411035 (2002-06-01), Marcotte
patent: 2002/0195936 (2002-12-01), Kato et al.
Notaro & Michalos P.C.
Orion Electric Co. Ltd.
Tran Chuc D
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