Electric lamp and discharge devices – Cathode ray tube – Image pickup tube
Reexamination Certificate
2002-03-19
2004-03-09
Glick, Edward J. (Department: 2882)
Electric lamp and discharge devices
Cathode ray tube
Image pickup tube
C313S583000, C313S585000
Reexamination Certificate
active
06703772
ABSTRACT:
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 surface discharge plasma display panel having an asymmetrical plane electrode structure.
2. Description of the Related Art
The plasma display panel has been known as a thin flat screen display device having a large screen size and a large capacity. Electrons are accelerated by an electric field so that the accelerated electrons have collisions to a discharge gas to cause excitation and subsequent relaxation. This relaxation process causes radiation of an ultraviolet ray. The ultraviolet ray is irradiated onto a fluorescent material, whereby the ultraviolet ray is converted into a visible light. The alternating current plasma display panel is generally superior in luminance, luminous efficiency and operational life-time than the direct current plasma display panel.
FIG. 1
is a perspective view illustrative of a panel structure of a conventional alternating current surface discharge memory type plasma display panel.
FIG. 2
is a cross sectional elevation view illustrative of a display cell structure of the conventional alternating current surface discharge memory type plasma display panel of FIG.
1
.
FIG. 3
is a fragmentary plane view illustrative of the display cell structure of FIG.
2
.
The conventional plasma display panel has a front side insulative substrate
1
and a back side insulative substrate
2
. A plurality of scanning electrodes
3
and a plurality of sustaining electrodes
4
are provided on an inside face of the front side insulative substrate
1
. The scanning electrodes
3
and the sustaining electrodes
4
are alternately aligned at a predetermined pitch in a first horizontal direction. The scanning electrodes
3
and the sustaining electrodes
4
have stripe shapes. The scanning electrodes
3
and the sustaining electrodes
4
extend in parallel to each other and in a second horizontal direction which is perpendicular to the first horizontal direction.
A plurality of first bus electrodes
5
are laminated on the scanning electrodes
3
for reducing an electrode resistance. The first bus electrodes
5
also have a stripe shape and extends along the scanning electrodes
3
. The first bus electrodes
5
have a smaller width than the scanning electrodes
3
. Each of the first bus electrodes
5
is aligned to one long side of each of the scanning electrodes
3
. A plurality of second bus electrodes
6
are laminated on the sustaining electrodes
4
for reducing an electrode resistance. The second bus electrodes
6
also have a stripe shape and extends along the sustaining electrodes
4
. The second bus electrodes
6
have a smaller width than the sustaining electrodes
4
. Each of the second bus electrodes
6
is aligned to one long side of each of the sustaining electrodes
4
.
A plurality of data electrodes
7
are provided on an inside face of the back side insulative substrate
2
. The data electrodes
7
are aligned at a predetermined constant pitch in the second horizontal direction. The data electrodes
7
have a stripe shape. The data electrodes
7
extend in parallel to each other and in the first horizontal direction which is perpendicular to the second horizontal direction along which the scanning electrodes
3
and the sustaining electrodes
4
extend.
A discharge gas is filled within an inter-space
8
defined between the front side insulative substrate
1
and the back side insulative substrate
2
. The discharge gas may be a helium gas, a neon gas, a xenon gas or a mixture gas thereof.
A first dielectric layer
10
is provided on the inside face of the front side insulative substrate
1
, so that the scanning electrodes
3
, the sustaining electrodes
4
, the first bus electrodes
5
and the second bus electrodes
6
are buried in the first dielectric layer
10
. A protection layer
11
is provided on an inside face of the first dielectric layer
10
for protecting the dielectric layer
10
from the discharge. The protection layer
11
may optically comprise magnesium oxide.
A second dielectric layer
12
is provided on the inside face of the back side insulative substrate
2
, so that the data electrodes
7
are buried in the first dielectric layer
10
. A plurality of separation walls
13
are provided on an inside face of the second dielectric layer
12
. The separation walls
13
extend in straight in parallel to each other and in the first horizontal direction, so that the separation walls
13
extend in parallel to the data electrodes
7
. In the plane view vertical to the surface of the back side insulative substrate
2
, each of the separation walls
13
is positioned between adjacent two of the data electrodes
7
, so that each of the data electrodes
7
is positioned under each gap defied between adjacent two of the separation walls
13
. The separation walls
13
define plural display cell regions, wherein each of the separation walls
13
separates adjacent two of the plural display cell regions.
A fluorescent material
9
is applied on exposed regions of the inner face of the second dielectric layer
12
and side walls of the separation walls
13
, wherein the exposed regions of the inner face of the second dielectric layer
12
are exposed to the plural display cell regions defined by the separation walls
13
. The fluorescent material
9
includes two dimensional arrays of three primary colors. The discharge gas generates the ultraviolet ray which is then irradiated onto the fluorescent material
9
, whereby the fluorescent material
9
shows the luminescence in accordance with the three primary colors, and a visible light
14
is emitted from an outside surface of the front side insulative substrate
1
.
With reference to
FIG. 2
, the discharge operation of the conventional plasma display panel will be described. A pulse voltage higher than a discharge threshold voltage level is applied across the scanning electrodes
3
and the data electrodes
7
to cause a discharge between the scanning electrodes
3
and the data electrodes
7
. In accordance with the polarity of the applied pulse voltage, positive charges and negative charges are forced to move in opposite directions to each other and then accumulated onto respective ones of the first and second dielectric layers
10
and
12
.
Equivalent internal voltage or wall voltage causing the respective accumulations of the positive charges and the negative charges has an opposite polarity to the applied pulse voltage, for which reason as the discharge time increases, the effective voltage level in the cell gradually decreases even the applied pulse voltage level remains kept at the constant level. The gradual decease of the effective voltage level results in no longer possible of sustaining the discharge, whereby the discharge will be discontinued in the course of time.
The primary discharge between the scanning electrodes
3
and the data electrodes
7
is caused under another voltage application between the scanning electrodes
3
and the sustaining electrodes
4
, so that the primary discharge between the scanning electrodes
3
and the data electrodes
7
serves as a trigger to cause a secondary discharge between the scanning electrodes
3
and the sustaining electrodes
4
. This secondary discharge between the scanning electrodes
3
and the sustaining electrodes
4
causes additional respective accumulations of the positive charges and the negative charges on the first dielectric layer
10
such as to cancel the applied voltage.
Subsequently, a sustaining pulse voltage having the same polarity as the wall voltage is further applied between the scanning electrodes
3
and the sustaining electrodes
4
, whereby the sustaining pulse voltage is superimposed with the wall voltage. If an amplitude of the sustaining pulse voltage is smaller than the threshold level, the discharge is caused between the scanning electrodes
3
and the sustaining electrodes
4
, provided that the effective voltage level as the superimposition o
Aibara Nobumitsu
Araki Kota
Hasegawa Hiroshi
Hirano Naoto
Homma Hajime
Gemmell Elizabeth
Glick Edward J.
NEC Corporation
Sughrue & Mion, PLLC
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