Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
1999-12-16
2001-05-22
Vu, David (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169400, C345S055000
Reexamination Certificate
active
06236166
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a plasma display panel, and more particularly to a structure and method for arranging poles in a plasma display panel.
BACKGROUND OF THE INVENTION
A conventional plasma display panel
10
is shown in
FIG. 1
wherein one glass substrate
11
has a different arrangement from the other glass substrate
12
thereon. Glass substrate
11
,
12
are sealed together in their respective peripheral edges. Then a neon, xenon, any of other inert gases, or any combination thereof is filled in the enclosed discharge space. The substrate
11
facing viewer is front substrate
11
. From the inner surface of front substrate
11
toward rear substrate
12
, a plurality of parallel transparent poles
111
, bus poles
112
, a dielectric layer
113
, and a protective layer
114
are sequentially formed thereon. Correspondingly, a plurality of parallel spacer walls
122
are formed wherein between any of two adjacent spacer walls
122
, a data pole
121
is formed on rear substrate
12
, a dielectric layer
124
is covered on data pole
121
, and a uniform fluorescent element
123
is formed to cover dielectric layer
124
and the opposing surfaces of spacer walls
122
.
In the following description two adjacent parallel transparent poles
111
(including bus poles
112
) are called X pole and Y pole respectively. These X and Y poles and the corresponding data pole
121
on rear substrate
12
form a three-pole, unit such that corresponding dielectric layers
113
,
124
may discharge on a discharge cell
13
formed in the space defined by X pole, Y pole, and two adjacent spacer walls
122
when a predetermined voltage is applied on the poles. As a result, a corresponding light is emitted by fluorescent element
123
. These equally spaced parallel poles
111
(i.e., X and Y poles) on front substrate
11
are formed by thick or thin film technique in the prior art plasma display panel
10
manufacturing process. The number of poles depends on the resolution of plasma display panel.
Referring to
FIG. 2
, a pole arrangement of the prior art plasma display panel
10
shown in
FIG. 1
is schematically illustrated. A shortbar
21
is provided on one end of front substrate
11
for connecting together the front ends of X poles. Shortbar
21
is connected to two short flexible printed circuits
22
which in turn are connected to bulk sustainer
23
such that bulk sustainer
23
may supply voltage needed for X poles discharge. At the other end of front substrate
11
, Y poles (labeled as Y
1
, Y
2
, Y
3
, . . . , Y
6
) are divided into two groups wherein one group (Y
1
, Y
2
, and Y
3
) is connected to electrical signal contacts
251
of scan driver
25
through a flexible printed circuit
24
, and the other group (Y
4
, Y
5
, and Y
6
) is also connected to electrical signal contacts
251
of scan driver
25
through a flexible printed circuit
24
such that scan driver
25
may supply scanning signal needed for Y pole displaying.
Referring to
FIG. 3
, another pole arrangement of the prior art plasma display panel
10
shown in
FIG. 1
is schematically illustrated. This pole arrangement is different from the one shown in
FIG. 2
as detailed below. That is, shortbar
21
is omitted such that X poles are connected to short flexible printed circuit
26
directly in one end of front substrate
1
. Short flexible printed circuits
26
are connected to shortbar
27
which in turn connects to bulk sustainer
23
such that bulk sustainer
23
may supply voltage needed for X poles discharge.
In the manufacturing process of above front substrate
11
, an open circuit
115
(i.e., break) may occur in an arbitrary position in either X pole or Y pole during its respective pole etching process as illustrated in FIG.
4
. As such, the pole (i.e., either X pole or Y pole) associated with the open circuit
115
is not. connected to bulk sustainer
23
or scan driver
25
, thus disrupting power supply. As a result, a normal discharge is made impossible. This causes a line defect on the pole in plasma display panel
10
. This line defect adversely affects the quality of plasma display panel, thus lowering yield and resulting in an increase in the manufacturing cost.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a structure and method for arranging poles in a plasma display panel comprising a plurality of spaced apart parallel X poles and a plurality of spaced apart parallel Y poles on an inner surface of plasma display panel wherein each X pole is adjacent to a Y pole. Two power contacts are formed on either end of X pole. Also two power contacts are formed on either end of Y pole. As such, once an open circuit occurred in one of poles in the manufacturing process, power contact at one end associated with the malfunctioned pole may be connected to the power contact of the pole at the other end. As such, the malfunctioned pole may be powered continuously so as to discharge. With this, the quality of plasma display panel is not significantly adversely affected by the defect, thus increasing yield and resulting in a decrease in the manufacturing cost.
It is another object of the present invention to provide a structure and method for arranging poles in a plasma display panel wherein power lines or connecting poles to bulk sustainer and scan driver respectively are provided in a superimposition relation on two different surfaces of a double-layer flexible printed circuit. Also the superimposed positions of the lines are as close to one end of the poles on the double-layer flexible printed circuit as possible so as to decrease the length of the parallel portions of adjacent lines, thereby significantly decreasing the coplanar stray capacitance generated on the flexible printed circuit.
It is still another object of the present invention to provide a structure and method for arranging poles in a plasma display panel wherein a shortbar in the power lines for connecting X poles to one of bulk sustainers is provided on a periphery of a single layer flexible printed circuit. A plurality of spaced apart parallel lines are extended from either of two opposing ends of shortbar toward the center. Each of the spaced apart parallel lines is connected to a corresponding X pole. A plurality of spaced apart parallel lines are provided on the center of flexible printed circuit each connected to a corresponding Y pole. These lines are only spaced apart parallel each other in a minimum length in the region near either end of the flexible printed circuit adjacent to the shortbar. As a result, a coplanar stray capacitance and a superimposed stray capacitance are eliminated in the single-layer flexible printed circuit. This further significantly decreases the manufacturing cost.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
REFERENCES:
patent: 5852347 (1998-12-01), Marcotte
Chen Kuang-Lang
Chou Pin-Hung
Lai Yao-Hung
Bacon & Thomas PLLC
Chunghwa Picture Tubes Ltd.
Vu David
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