Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Reexamination Certificate
1999-12-30
2002-04-16
Ramsey, Kenneth J. (Department: 2879)
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
C313S582000
Reexamination Certificate
active
06371822
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a display panel, and more particularly to a barrier rib composition capable of improving a strength of a barrier rib in the plasma display panel.
2. Description of the Related Art
Generally, a plasma display panel(PDP) radiates a fluorescent body by an ultraviolet with a wavelength of 147 nm generated during a discharge of He+Xe or Ne+Xe gas to thereby display a picture including characters and graphics. Such a PDP is easy to be made into a thin film and large-dimension type. Moreover, the PDP provides a very improved picture quality owing to a recent technical development. The PDP is largely classified into a direct current (DC) driving system and an alternating current (AC) driving system.
The PDP of AC driving system is expected to be highlighted into a future display device because it has advantages in the low voltage drive and a prolonged life in comparison to the PDP of DC driving system. Also, the PDP of alternating current driving system allows an alternating voltage signal to be applied between electrodes having dielectric layer therebetween to generate a discharge every half-period of the signal, thereby displaying a picture. Since such an AC driving system PDP uses a dielectric material, the surface of the dielectric material is charged with wall charge. The AC-type PDP allows a memory effect to be produced by a wall charge accumulated to the dielectric material due to the discharge.
FIG.
1
and
FIG. 2
are a perspective view and a sectional view of a conventional AC-type PDP having a discharge cell arranged in a matrix pattern, respectively. In
FIG. 2
, the AC-type PDP is illustrated in a state of rotating a lower plate at 90° for the sake of an easy understanding. The AC-type PDP includes a front substrate
10
provided with a sustaining electrode pair
12
A and
12
B, and a rear substrate
18
provided with an address electrode
20
. The front substrate
10
and the rear substrate
18
are spaced in parallel with having a barrier rib
24
therebetween. A mixture gas such as Ne−Xe or He−Xe, etc. is injected into a discharge space defined by the front substrate
10
and the rear substrate
18
and the barrier rib
24
. Any one of the sustaining electrode pair is used as a scanning/sustaining electrode
12
A that responds to a scanning pulse applied in an address interval to cause an opposite discharge along with the address electrode
20
while responding to a sustaining pulse applied in a sustaining interval to cause a surface discharge with the adjacent sustaining electrode
12
B. The sustaining electrode
12
B adjacent to the scanning/sustaining electrode
12
A is used as a common sustaining electrode to which a sustaining pulse is applied commonly. A distance a between the sustaining electrodes
12
A and
12
B making a pair is set to be approximately 100 &mgr;m. On the front substrate
1
provided with the sustaining electrodes
12
A and
12
B, a dielectric layer
14
and a protective film
16
are disposed. The dielectric layer
14
is responsible for limiting a plasma discharge current as well as accumulating a wall charge during the discharge. The protective film
16
prevents a damage of the dielectric layer
14
caused by a sputtering generated during the plasma discharge and improves an emission efficiency of secondary electrons. This protective film
16
is usually made from MgO. Barrier ribs
24
for dividing the discharge space is extended perpendicularly at the rear substrate
18
, and the address electrode
20
is formed between the barrier ribs
24
. On the rear substrate
18
provided with the barrier ribs
24
and the address electrode
20
, a fluorescent layer
26
excited by a vacuum ultraviolet Ray to generate a visible light is provided.
As shown in
FIG. 3
, such a discharge cell is arranged in a matrix pattern. At each of the discharge cells (
11
), scanning/sustaining electrode lines Y
1
to Ym, common sustaining electrode lines Z
1
to Zm and address electrode lines X
1
to Xn are crossed with respect to each other. The scanning/sustaining electrode lines Y
1
to Ym and the common sustaining electrode lines Z
1
to Zm consist of the sustaining electrodes
12
A and
12
B making a pair. The address electrode lines X
1
to Xn consist of the address electrode
20
.
In the PDP having the above-mentioned configuration, the barrier ribs
24
support the front substrate
10
and the rear substrate
18
. Also, the barrier ribs
24
prevent an ultraviolet ray generated by the discharge from being leaked into the adjacent discharge cell and reflect a rear light emitted from the fluorescent layer
26
, thereby increasing the brightness of the PDP. The top portion of the barrier rib
24
has a black color so as to improve the contrast of a screen.
A process of fabricating the barrier ribs
24
will be described below. First, ceramic powder is usually mixed with an organic binder and an organic solvent, etc to be made into a paste state. Subsequently, the mixed paste is used to form a pattern on the rear substrate
18
by the screen printing technique and then is dried and tempered, thereby forming the barrier ribs. Otherwise, the barrier ribs
24
may be formed by entirely printing the paste on the rear substrate
18
and drying it and thereafter patterning the paste using the sand blast technique and tempering it.
However, the ceramic tempered material has a problem in that, since it is an inorganic material, a compressed strength is strong while a tensile strength is weak in accordance with an intrinsic characteristic of cermic. Accordingly, the conventional barrier ribs
24
made from the ceramic tempered material generate a crack by a tensile force induced by vertical compressive force exerting on the barrier ribs
24
during a process of attaching the front substrate
10
to the rear substrate
18
. Also, the conventional barrier ribs
24
made from the ceramic tempered material may experience its partial damage due to an exterior impact during a fabrication process and a transportation of the product.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a composition of barrier rib material that is capable of improving a strength of a barrier rib in a plasma display panel.
In order to achieve these and other objects of the invention, a composition of barrier rib material for a plasma display panel according to one aspect of the present invention includes a barrier rib material paste; and a fiber material with a certain tensile strength.
REFERENCES:
patent: 5030397 (1991-07-01), Bandyopadhyay et al.
patent: 5087399 (1992-02-01), Neil et al.
patent: 5818168 (1998-10-01), Ushifusa et al.
patent: 53122360 (1978-10-01), None
LG Electronics Inc.
Ramsey Kenneth J.
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