Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
1998-05-15
2001-08-21
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S582000, C313S586000
Reexamination Certificate
active
06278238
ABSTRACT:
BACKGROUND OF THE INVENTION
A. Field of the Invention
The present invention relates to a plasma display panel (PDP), more particularly to a three-electrode PDP.
B. Description of the Prior Art
The unit cell of a conventional three-electrode surface discharging PDP is constructed, as shown in
FIG. 1
, in such a manner that a scan electrode
2
to which a scan pulse is applied during address period and a sustain electrode
3
to which a sustain pulse for maintaining discharge are formed on an upper substrate
10
, a data electrode
1
to which a data pulse for generating sustain discharge between scan electrode
2
and sustain electrode
3
is formed on a lower substrate
20
, a dielectric layer
6
is coated under upper substrate
10
for protecting scan electrode
2
and sustain electrode
3
, and an R, G, B phosphor
5
is formed on data electrode
1
and placed between barriers
4
supporting upper and lower substrates
10
and
20
. A cell (not shown) is formed at a portion where a vertical electrode (that is, scan electrode
2
and sustain electrode
3
) intersects a horizontal electrode (that is, data electrode
1
) and these cells construct a PDP.
A general operation of the three-electrode surface discharging PDP is explained below. First of all, a reset pulse is supplied to scan electrode
2
, and then a write enable pulse is applied thereto. Here, when a write pulse is applied to data electrode
1
of a cell to be displayed, discharging occurs in a selected scan line, and wall charge is formed. Thereafter, when the sustain pulse is applied to sustain electrode
3
, the discharging is maintained and the scan electrode make a couple with the sustain electrode, sustaining the discharge.
In the aforementioned conventional PDP, and as shown in
FIG. 2
, barriers
4
and data electrode
1
are formed in parallel with each other, allowing plasma to be freely diffused between cells which are vertically adjacent to each other. However, this may bring about crosstalk, undesirable discharge, between the cells. Furthermore, the barrier of the conventional PDP is formed on the lower substrate. Thus, if there is a gap between the barrier and upper substrate, plasma is diffused to other cells through the gap, and it can easily generate undesirable discharge even at low voltage, deteriorating the picture quality.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a plasma display panel that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a PDP which does not allow plasma to be diffused to other cells.
Another object of the present invention is to prevent discharge at lower voltage.
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. The objects and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention comprises: a first substrate; a second substrate opposite the first substrate; a barrier separating the first and second substrates; a scan electrode adjacent the first substrate and providing a scan pulse; a data electrode adjacent the second substrate and providing a data pulse, wherein the barrier overlying the data electrode has a non-zero angle therebetween.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
REFERENCES:
patent: 3873870 (1975-03-01), Fukushima et al.
patent: 4185229 (1980-01-01), Yoshikawa et al.
patent: 5107182 (1992-04-01), Sano et al.
patent: 5825128 (1998-10-01), Betsui et al.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Gerike Matthew John
LG Electronics Inc.
Patel Ashok
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