Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Utility Patent
1998-03-18
2001-01-02
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S584000, C313S585000, C313S586000, C313S587000
Utility Patent
active
06169363
ABSTRACT:
BACKGROUND
1. Field of the Invention
The present invention relates to an AC drive type display apparatus utilizing a so-called plasma discharge such as an AC type plasma display panel (hereinafter referred to as an AC type PDP).
2. Background of the Invention
There has been an AC type PDP for accumulating charges in a charge accumulation layer provided between a discharge sustain electrode group and an address electrode group to carry out display by utilizing discharge characteristics resulting from a high-frequency discharge phenomenon. The AC type PDP includes that for presenting a color of emitted light of discharge gas and that in which a phosphor emits visible light by utilizing ultraviolet rays generated from discharge.
Various kinds of methods of arranging the AC type PDP have been known. In order to reduce a thickness of the PDP, many PDPs employ an arrangement in which peripheries of a front surface glass panel and a rear surface glass panel opposed to each other are sealed and discharge gas is filled into a tightly sealed vessel.
A discharge display cell is usually formed at a position where a stripe first electrode group and a stripe second electrode group. A barrier rib is formed around the discharge display cell in order to prevent erroneous discharge from being carried out between adjacent cells and prevent color from blurring on adjacent cells and to keep the difference between pressures inside and outside the panel and keep the distance between electrodes.
A color AC type PDP will hereinafter be described. A display discharge electrode is arranged as that of a so-called plane discharge type in order to locate it away from a phosphor formed portion. It is known that a conventional color AC type PDP includes those driven by a two-phase electrode and a three-phase electrode.
FIG. 1
shows an arrangement of a two-phase electrode color AC type PDP.
FIG. 2
is a cross-sectional view of the two-phase color AC type PDP shown in
FIG. 1
cut along a line A—A′.
FIG. 1
is a diagram showing an arrangement of a part, corresponding to one pixel, of the three-phase color AC type PDP. A PDP
1
has, in its matrix-display unit light emitting region, a two-electrode structure in which a display electrode
2
and an address electrode
6
opposed to each other and a phosphor
8
is formed on the side of the address electrode
6
.
The display electrode
2
for the plane discharge is provided on a front-surface glass substrate on the display surface side, and covered with a dielectric layer
4
for AC drive so as not to be exposed to the discharge space. A black matrix
5
for setting a unit light emitting region is provided at a position, corresponding to a barrier rib
9
described later on, on a surface of the dielectric layer
4
.
The address electrodes
6
used for selectively making the unit light emitting regions emitting light are arranged on a rear-surface side glass substrate
7
at every predetermined pitch so as to be perpendicular to the display electrode
2
.
Stripe barrier ribs
9
having a predetermined width for keeping a length of the discharge space are provided through a white dielectric layer
8
between the adjacent address electrodes
6
, and thereby divides the discharge space into the unit light emitting regions in the line direction (i.e., the direction in which the display electrode
2
is extended). Phosphors
10
of three primary colors, i.e., red, green and blue are provided on the rear surface glass substrate
7
so as to cover a rear-surface-side inner surface including an upper surface of the address electrode
2
and a side surface of the barrier rib
9
. Penning gas obtained by mixing neon or argon with xenon is filled as discharge gas used for emitting ultraviolet rays for the phosphor
10
by excitation in the discharge space.
FIG. 3
is a diagram showing an arrangement of a three-phase AC type PDP.
FIG. 4
is a cross-sectional view of the three-phase AC type PDP shown in
FIG. 3
cut along a line B—B′which is in parallel to the direction where an address electrode is extended.
FIG. 5
is a cross-sectional view of the three-phase AC type PDP shown in
FIG. 3
cut along a line C—C′ which is in parallel to the direction where an address electrode is extended.
FIG. 3
is a perspective view showing a part, corresponding to one pixel, of the three-phase color AC type PDP. A PDP
11
has, in its matrix display unit light emitting region, a three-electrode structure in which a pair of display electrodes
13
,
13
and an address electrode
18
are opposed to each other and a phosphor
21
is formed on the side of the address electrode
18
. This three-phase color AC type PDP is called a plane discharge type PDP.
The display electrodes
13
,
13
used for the plane discharge are provided on a display-surface-side front surface glass substrate
12
, and covered with a dielectric layer
15
for AC drive so as not to be exposed to the discharge space. On a surface of the dielectric film
15
, an MgO film having a thickness of about several thousand Å is provided as a protective layer
16
for the dielectric layer
15
. Bus electrodes
14
,
14
having low resistance are formed on the display electrodes
13
,
13
.
The address electrodes
18
used for selectively making the unit light emitting regions emitting light are arranged on a rear-surface-side glass substrate
17
at a pitch of about 200 &mgr;m so as to be perpendicular to the display electrodes
13
,
13
.
Stripe barrier ribs
20
having a width of about 100 &mgr;m for keeping a length of the discharge space are provided between the adjacent address electrodes
18
,
18
, and thus divides the discharge space into the unit light emitting regions in the line direction (i.e., in the direction in which the display electrodes
13
,
13
are extended). On a rear-surface glass substrate
17
, a phosphor layer
21
(i.e., phosphors
21
R,
21
B,
21
G for three primary colors, i.e., red, green and blue) is provided so as to cover a rear-surface-side inner surface including an upper surface of the address electrode
18
and a side surface of the barrier rib
20
. Penning gas obtained by mixing neon with xenon is filled as discharge gas used for emitting ultraviolet rays for the phosphors
21
R,
21
B,
21
G by excitation in the discharge space.
Three red (R), green (G) and blue (B) unit light emitting regions having the same area and arranged in the line direction correspond to one pixel forming the display screen. A plane discharge cell (a main discharge cell used for display) is determined by a pair of display electrodes
13
,
13
and an address discharge cell used for selecting whether it is used for display or not is determined by one of the display electrode
13
,
13
and the address electrode
18
. Thus, it is possible to selectively permit the portion corresponding to each of the unit light emitting regions of the phosphors
21
R,
21
G and
21
B continuously arranged in the lateral direction in
FIG. 40
to emit light, thereby a full color display being capable to be carried out by utilizing combination of red (R), green (G) and blue (B).
However, in order to obtain high=definition display pixels in such color AC type PDP
11
, a distance between the display electrodes
13
,
13
must be set shorter. In connection therewith, a distance between the address electrode
18
and the display electrodes
13
,
13
must be set equal to the distance between the display electrodes
13
,
13
. At this time, if the distance between the display electrodes
13
,
13
does not exceed 20 &mgr;m and the phosphor layers
21
having a thickness of 20 to 40 &mgr;m is formed, then there is no space for the plasma discharge space
22
and puncture may disadvantageously occur between the electrodes. Even if the space for the plasma discharge space
22
is secured, the phosphor layer
21
is formed only on a limited portion. Moreover, if an amount of the phosphor layer
21
is reduced, then the luminance becomes lower and further the phosphor layer
21
is deteriorated by ion which impi
Mori Hiroshi
Nakamura Suehiro
Haynes Mack
Kananen Ronald P.
Patel Nimeshkumar D.
Rader Fishman & Grauer
Sony Corporation
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