Method of driving AC plasma display panel

Details Method of driving AC plasma display panel Method of driving AC plasma display panel

2000-04-11

2003-08-05

Saras, Steven (Department: 2675)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S067000, C345S068000, C345S037000

Reexamination Certificate

active

06603447

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method of driving an AC plasma display panel used as an image display in a television receiver, a computer monitor, or the like.
BACKGROUND OF THE INVENTION
In a conventional AC plasma display panel (hereinafter referred to as a “panel”), as shown in
FIG. 3
, plural pairs of a scanning electrode
2
and a sustain electrode
3
are provided on a first glass substrate
1
in parallel with one another, and a dielectric layer
4
and a protective film
5
are provided so as to cover the pairs of the scanning electrode
2
and the sustain electrode
3
. On a second glass substrate
6
, a plurality of data electrodes
8
covered with a dielectric layer
7
are provided. On the dielectric layer
7
, separation walls
9
are provided between every two of the data electrodes
8
in parallel to the data electrodes
8
. Phosphors
10
are provided on the surface of the dielectric layer
7
and on side faces of the separation walls
9
. The first glass substrate
1
and the second glass substrate
6
are positioned opposing each other with a discharge space
11
being sandwiched therebetween so that the scanning electrode
2
and the sustain electrode
3
are orthogonal to the data electrodes
8
. A discharge cell
12
is formed between two adjacent separation walls
9
at the intersection of a data electrode
8
and a pair of the scanning electrode
2
and the sustain electrode
3
. In the discharge spaces
11
, xenon and at least one selected from helium, neon, and argon are filled as discharge gases.
The electrode array in this panel has a matrix form of M×N as shown in FIG.
4
. In the column direction, M columns of data electrodes D
1
to D
M
are arranged, and N rows of scanning electrodes SCN
1
to SCN
N
and sustain electrodes SUS
1
to SUS
N
are arranged in the row direction. The discharge cell
12
shown in
FIG. 3
corresponds to the region shown in FIG.
4
.
FIG. 5
shows a timing chart of an operation driving waveform in a conventional driving method for driving this panel. In
FIG. 5
, one subfield is shown. One field for displaying one picture includes a plurality of subfields. The conventional driving method of driving this panel is described with reference to
FIGS. 3
to
5
as follows.
As shown in
FIG. 5
, all the data electrodes D
1
to D
M
and all the sustain electrodes SUS
1
to SUS
N
are maintained at an electric potential of 0 (V) in an initialization operation in the first part of an initialization period. To all the scanning electrodes SCN
1
to SCN
N
, a positive-polarity initialization waveform is applied, which increases rapidly from the potential of 0 (V) to an electric potential Vc (V) and then increases more gradually up to a potential Vd (V). At the potential Vc, the voltages of the scanning electrodes SCN
1
to SCN
N
with respect to all the sustain electrodes SUS
1
to SUS
N
are below the firing voltage, and at the potential Vd, those voltages are beyond the firing voltage. During the gradual increase in the initialization waveform, first weak initialization discharges occur in respective discharge cells
12
from all the scanning electrodes SCN
1
to SCN
N
to all the data electrodes D
1
to D
M
and all the sustain electrodes SUS
1
to SUS
N
, respectively. Thus, a negative wall voltage is stored at the surface of the protective film
5
on the scanning electrodes SCN
1
to SCN
N
. At the same time, positive wall voltages are stored at the surfaces of the phosphors
10
on the data electrodes D
1
to D
M
and at the surface of the protective film
5
on the sustain electrodes SUS
1
to SUS
N
.
In an initialization operation in the second part of the initialization period, a potential Vq (V) is applied to all the sustain electrodes SUS
1
to SUS
N
. At the same time, to all the scanning electrodes SCN
1
to SCN
N
, a waveform is applied, which decreases rapidly from the potential Vd to a potential Ve (V) and then decreases more gradually to a potential Vi (V), thus completing the application of the initialization waveform. At the potential Ve, the voltages of the scanning electrodes SCN
1
to SCN
N
with respect to all the sustain electrodes SUS
1
to SUS
N
are below the firing voltage, and at the potential Vi, those voltages are beyond the firing voltage. During the gradual decrease in the initialization waveform, second weak initialization discharges occur in the respective discharge cells
12
from all the data electrodes D
1
to D
M
and all the sustain electrodes SUS
1
to SUS
N
to all the scanning electrodes SCN
1
to SCN
N
. Thus, the negative wall voltage at the surface of the protective film
5
on the scanning electrodes SCN
1
to SCN
N
and the positive wall voltages at the surface of the protective film
5
on the sustain electrodes SUS
1
to SUS
N
and at the surfaces of the phosphors
10
on the data electrodes D
1
to D
M
are weakened to wall voltages suitable for a write operation. Thus, the initialization operation in the initialization period is completed.
In a write operation in the subsequent write period, the potential Vq is applied to all the sustain electrodes SUS
1
to SUS
N
continuously. Initially, a potential Vg (V) is applied to all the scanning electrodes SCN
1
to SCN
N
. Then, to the scanning electrode SCN
1
in the first row, a scanning waveform of a potential Vi is applied, which has a polarity opposite to that of the initialization waveform and is the same potential as the potential Vi at the end of the initialization waveform. At the same time, a data waveform of a potential Vb (V) with the same polarity as that of the initialization waveform is applied to a designated data electrode D
j
(j indicates one or more designated integers of 1 to M) that is selected from the data electrodes D
1
to D
M
and corresponds to a discharge cell
12
to be operated so as to emit light in the first row. In this state, the potential difference between the surface of the protective film
5
on the scanning electrode SCN
1
and the surface of the phosphor
10
at the intersection (a first intersection) of the designated data electrode D
j
and the scanning electrode SCN
1
is calculated by subtracting the negative wall voltage at the surface of the protective film
5
on the. scanning electrode SCN
1
from the sum of the potential Vb of the data waveform and the positive wall voltage at the surface of the phosphor
10
on the data electrode D
j
(i.e. by adding the absolute values of them). Therefore, at the first intersection, a write discharge occurs between the designated data electrode D
j
and the scanning electrode SCN
1
. At the same time, this write discharge induces a write discharge between the sustain electrode SUS
1
and the scanning electrode SCN
1
at the first intersection. Thus, at the first intersection, a positive wall voltage is stored at the surface of the protective film
5
on the scanning electrode SCN
1
, and a negative wall voltage is stored at the surface of the protective film
5
on the sustain electrode SUS
1
.
Then, to the scanning electrode SCN
2
in the second row, a scanning waveform of a potential Vi is applied. At the same time, a data waveform of a potential Vb is applied to a designated data electrode D
j
that is selected from the data electrodes D
1
to D
M
and corresponds to a discharge cell
12
to be operated so as to emit light in the second row. In this state, the potential difference between the surface of the protective film
5
on the scanning electrode SCN
2
and the surface of the phosphor
10
at the intersection (a second intersection) of the designated data electrode D
j
and the scanning electrode SCN
2
is calculated by subtracting the negative wall voltage at the surface of the protective film
5
on the scanning electrode SCN
2
from the sum of the potential Vb of the data waveform and the positive wall voltage at the surface of the phosphor
10
on the data electrode D
j
. Therefore, at the second intersection, a write discharge occurs between the designated data electrode D
j
and the scanning electrode SCN
2

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