Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Reexamination Certificate
2000-03-20
2003-04-08
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
C313S485000, C313S582000, C313S583000
Reexamination Certificate
active
06545405
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an AC plasma display panel used for image display in a television receiver, a computer monitor, or the like.
BACKGROUND OF THE INVENTION
A conventional AC plasma display panel (hereinafter referred to as a “panel”) is shown in FIG.
6
. On a first insulating substrate
1
, a plurality of sustain electrodes
4
and a plurality of scanning electrodes
5
, which are covered with a dielectric layer
2
and a protective film
3
, are provided alternately in parallel. A plurality of data electrodes
7
are provided on a second insulating substrate
6
. Between respective data electrodes
7
, a plurality of separation walls
8
are provided in parallel to the data electrodes
7
. Phosphors
9
are provided on the data electrodes
7
and side faces of the separation walls
8
. The first insulating substrate
1
and the second insulating substrate
6
are positioned opposing each other so that the sustain electrodes
4
and the scanning electrodes
5
are orthogonal to the data electrodes
7
. Each sustain electrode
4
includes a transparent electrode
41
and a bus-bar
42
formed on the transparent electrode
41
. Similarly, each scanning electrode
5
includes a transparent electrode
51
and a bus-bar
52
formed on the transparent electrode
51
.
Generally, since a transparent electrode formed of ITO (Indium Tin Oxide) or the like has a high resistance, a bus-bar formed of silver or the like is superposed on the transparent electrode, thus lowering the resistance in an electrode as a whole. Therefore, the resistances per unit length of the sustain electrode
4
and the scanning electrode
5
depend on the resistance of the bus-bars
42
and
52
. Thus, the line width of the bus-bar
42
of the sustain electrode
4
and that of the bus-bar
52
of the scanning electrode
5
are made to be approximately the same, thus setting the resistance per unit length of the sustain electrode
4
and that of the scanning electrode
5
to be approximately the same. Further, on both the adjacent sides of all the scanning electrodes
5
, the sustain electrodes
4
are disposed. Display is carried out by sustain discharges in two places between respective scanning electrodes
5
and sustain electrodes
4
on both the adjacent sides thereof.
As shown in
FIG. 7
, the electrodes in this conventional panel include M rows of scanning electrodes SCN
1
to SCN
M
and M+1 rows of sustain electrodes SUS
1
to SUS
M+1
, which are arranged in the row direction. In the column direction, N columns of data electrodes D
1
to D
N
are arranged. The intersections of the respective data electrodes and the respective sets of scanning electrodes and sustain electrodes on both adjacent sides thereof function as discharge cells C
11
to C
MN
. The discharge cells C
11
to C
MN
are arranged in a matrix form of M×N. The scanning electrodes SCN
1
to SCN
M
are connected to a driving circuit at their left ends and the sustain electrodes SUS
1
to SUS
M+1
are connected to the driving circuit at their right ends, which is not shown in the figure.
A method of driving this conventional panel is described using a diagram showing a timing chart of an operation driving waveform shown in FIG.
8
.
Initially, in a write period, all the sustain electrodes SUS
1
to SUS
M+1
are maintained at a voltage of 0. In scanning of the first row by a scanning electrode SCN
1
, a positive write pulse voltage of +Vw is applied to a designated data electrode D
j
(j indicates one or more integers of 1 to N) that is selected from the data electrodes D
1
to D
N
and corresponds to a discharge cell to be operated so as to emit light, and a negative scan pulse voltage of −Vs is applied to the scanning electrode SCN
1
. This causes a write discharge in a discharge cell C
1j
at the intersection of the designated data electrode D
j
and the scanning electrode SCN
1
. This write discharge induces discharges between the scanning electrode SCN
1
and respective half portions of the sustain electrodes SUS
1
and SUS
2
facing the scanning electrode SCN
1
. In the discharge cell C
1j
in which the write discharges have occurred, positive electric charges are stored at the surface of the protective film
3
on the scanning electrode SCN
1
, and negative electric charges at the surface of the protective film
3
on the respective half portions of the sustain electrodes SUS
1
and SUS
2
.
Next, in scanning of the second row by a scanning electrode SCN
2
, a positive write pulse voltage of +Vw is applied to a designated data electrode D
j
that is selected from the data electrodes D
1
to D
N
and corresponds to a discharge cell to be operated so as to emit light, and a negative scan pulse voltage of −Vs is applied to the scanning electrode SCN
2
. This causes a write discharge in a discharge cell C
2j
at the intersection of the designated data electrode D
j
and the scanning electrode SCN
2
. This write discharge induces discharges between the scanning electrode SCN
2
and respective half portions of the sustain electrodes SUS
2
and SUS
3
facing the scanning electrode SCN
2
. In the discharge cell C
2j
in which the write discharges have occurred, positive electric charges are stored at the surface of the protective film
3
on the scanning electrode SCN
2
, and negative electric charges at the surface of the protective film
3
on the respective half portions of the sustain electrodes SUS
2
and SUS
3
.
Successively, the same scanning operation is carried out for all remaining rows up to the scanning electrode SCN
M
in the M row. Thus, the same predetermined electric charges as described above are stored at the surface of the protective film
3
.
In the subsequent sustain period, initially a negative sustain pulse voltage of −Vm is applied to all the sustain electrodes SUS
1
to SUS
M+1
. Thus, in a discharge cell C
ij
(i indicates one or more integers selected from 1 to M) in which the write discharges have occurred, the voltage between the surface of the protective film
3
on a scanning electrode SCN
i
and the surface of the protective film
3
on sustain electrodes SUS
i
or SUS
i+1
is the sum of the negative sustain pulse voltage of −Vm, the positive electric charges at the surface of the protective film
3
on the scanning electrode SCN
i
, and the negative electric charges at the surface of the protective film
3
on the sustain electrodes SUS
i
or SUS
i+1
, which exceeds the discharge starting voltage. Therefore, sustain discharges start between the scanning electrode SCN
i
and the sustain electrodes SUS
i
and SUS
i+1
. As a result, the electric charges stored at the surface of the protective film
3
are reversed and thus negative electric charges are stored at the surface of the protective film
3
on the scanning electrode SCN
i
and positive electric charges at the surface of the protective film
3
on the sustain electrodes SUS
i
and SUS
i+1
. Successively, the negative sustain pulse voltage of −Vm is applied to all the scanning electrodes SCN
1
to SCN
M
and all the sustain electrodes SUS
1
to SUS
M
alternately. Thus, in the discharge cell C
ij
in which the write discharges have occurred, sustain discharges occur successively between the scanning electrode SCN
i
and the sustain electrodes SUS
i
and SUS
i+1
. Light emissions caused by those sustain discharges are used for display.
In the subsequent erase period, a negative narrow-width erase pulse voltage of −Ve is applied to all the sustain electrodes SUS
1
to SUS
M+1
. This causes erase discharges to terminate the sustain discharges. With the above-mentioned operations, one picture is displayed in the panel.
In such display of one picture, only light emissions with a certain constant luminance can be used for the display. Therefore, when a gray-scale image is to be displayed as in image display for a television, the display period of one picture is set to be one subfield, and during {fraction (1/60)} second,
Fujiwara Shinya
Hirao Kazunori
Kiriyama Kenji
Shino Taichi
Matsushita Electric - Industrial Co., Ltd.
Merchant & Gould P.C.
Patel Vip
Quarterman Kevin
LandOfFree
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