AC plasma display apparatus

Details AC plasma display apparatus AC plasma display apparatus

2000-04-07

2001-11-20

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C345S068000, C345S067000, C345S060000, C345S055000

Reexamination Certificate

active

06320326

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to AC plasma display apparatus for use as a display device of television and computer systems.
BACKGROUND OF THE INVENTION
FIG. 6
shows a conventional AC plasma display panel and its driving circuit. The AC plasma display panel
1
, herein after referred to as “panel” for clarity, has 2M rows of scan electrodes SCN(
1
)-SCN(
2
M) and sustain electrodes SUS(
1
)-SUS(
2
M), and N columns of data electrodes D(
1
)-D(N) each extending perpendicular to scan and sustain electrodes, forming a 2M by N matrix. Each of scan electrodes SCN(i) pairs with a corresponding sustain electrode SUS(i) so that the paired scan and sustain electrodes cooperate with one of the crossing data electrodes D(j) (integer j:1−N) to form a cell where an electric discharge will occur.
In this panel
1
, lead wires of the paired scan and sustain electrodes, SCN(i) and SUS(i), are extended out in opposite directions. Also, the lead wires of the neighboring scan electrodes, for example, SCN(
1
) and SCN(
2
), are extended out in opposite directions. Likewise, the lead wires of the neighboring sustain electrodes, for example, SUS(
1
) and SUS(
2
), are extended out in opposite directions. That is, in this arrangement, the odd number of scan electrodes SCN(
1
), SCN(
3
), . . . . , SCN(
2
M-
1
) are led out to the left side of the panel and then electrically connected with a scan electrode drive circuit
2
a
for driving scan electrodes with odd number. On the other hand, the even number of scan electrodes SCN(
2
), SCN(
4
), . . . , SCN(
2
M) are led out to the right side of the panel and then electrically connected with a scan electrode drive circuit
2
b
for driving scan electrodes with even number. Further, the even number of sustain electrodes SUS(
2
), SUS(
4
), . . . , SUS(
2
M) are led out to the left side of the panel and then electrically connected with a sustain electrode drive circuit
3
b
for driving sustain electrodes with even number. On the other hand, the odd number of sustain electrodes SUS(
1
), SUS(
3
), . . . , SUS(
2
M-
1
) are led out to the right side of the panel and then electrically connected with a sustain electrode drive circuit
3
a
for driving sustain electrodes with odd number. In addition, lead wires of the data electrodes D(
1
)-D(N) are extended out upwardly and then electrically connected with a data electrode drive circuit
4
for driving the data electrodes.
Referring again
FIG. 6
as well as
FIG. 7
showing a time chart, operations of the conventional panel will be described briefly. Firstly, in a period for writing, sustain drive circuit
3
a
or
3
b
applies no signal or voltage to sustain electrodes SUS(
1
)-SUS(
2
M). For scanning in the first row scan electrode SCN(
1
), among data electrodes D(
1
)-D(N), selected one or more data electrodes D(j) corresponding to discharge cells for displaying are applied with a certain positive write pulse of +Vw volts from the data electrode drive circuit
4
, and the first scan electrode SCN(
1
) is applied with a certain negative scan pulse of −Vs volts from scan electrode drive circuit
2
a
. This causes an electric discharge (writing discharge) at each of the intersections of the selected data electrodes D(j) and scan electrode SCN(
1
).
Then, for scanning in the second row scan electrode SCN(
2
), selected one or more data electrodes D(j) corresponding to discharge cells for displaying are applied with the write pulse of +Vw volts from the data electrode drive circuit
4
, and the second scan electrode SCN(
2
) is applied with scan pulse of −Vs volts from another scan electrode drive circuit
2
b
. This causes the electric discharge (writing discharge) at each of the intersections of the selected data electrodes D(j) and scan electrode SCN(
2
). Similar operations are performed successively for scan electrodes SCN(
3
) to SCN(
2
M), causing electric discharges at discharge cells at intersections of data electrodes D(j) and scan electrodes SCN(
3
) to SCN(
2
M).
Secondly, in a subsequent period for sustaining, sustain electrode drive circuits
3
a
and
3
b
apply a negative sustain pulse of −Vm volts to every sustain electrodes SUS(
1
)-SUS(
2
M). This causes an initial sustain discharge between scan and sustain electrodes, SCN(i) and (i), in each of the discharge cells where the writing discharge has occurred in the write period. At this moment, a sustain discharge current flows from scan electrode drive circuit
2
a
through odd scan electrodes SCN(
2
K-
1
) (integer K: 1 to M) and then odd sustain electrodes SUS(
2
K-
1
) toward sustain electrode drive circuit
3
a
. Also, a sustain-discharge current flows from scan electrode drive circuit
2
b
through even scan electrodes SCN(
2
K) and then even sustain electrodes SUS(
2
K) toward sustain electrode drive circuit
3
b.
Afterwards, sustain electrode drive circuits
3
a
and
3
b
apply no voltage to every sustain electrodes SUS(
1
)-SUS(
2
M), but scan electrode drive circuits
2
a
and
2
b
apply negative sustain pulse of −Vm volts. This causes a sustain discharge between scan and sustain electrodes, SCN(i) and SCN(i), in each of the discharge cells where the writing discharge has occurred. At this moment, sustain discharge current flows from sustain electrode drive circuit
3
a
through the odd sustain electrodes SUS(
2
K-
1
) and then odd scan electrodes SCN(
2
K-
1
) toward scan electrode drive circuit
2
a
. Also, sustain discharge current flows from sustain electrode drive circuit
3
b
through even sustain electrodes SUS(
2
K) and then scan electrodes SCN(
2
K) toward scan electrode drive circuit
2
b.
Subsequently, scan electrodes SCN(
1
)-SCN(
2
M) and sustain electrodes SUS(
1
)-SUS(
2
M) are applied with the negative sustain pulse of −Vm volts alternatively from scan electrode drive circuits
2
a
and
2
b
and sustain electrode drive circuits
3
a
and
3
b
. This retains sustain discharge between scan and sustain electrodes, SCN(i) and (i), at each of the discharge cells where the writing discharge have occurred. This in turn allows sustain discharge current to flow from sustain electrode drive circuit
3
a
to scan electrode drive circuit
2
a
and from sustain electrode drive circuit
3
b
to scan electrode drive circuit
2
b
. In addition, sustain discharge current flows from scan electrode drive circuit
2
a
to sustain electrode drive circuit
3
a
and from scan electrode drive circuit
2
b
to sustain electrode drive circuit
3
b.
In the subsequent period for erasing, all sustain electrodes SUS(
1
)-SUS(
2
M) are applied with a short negative erase pulse of −Ve volts from sustain electrode drive circuits
3
a
and
3
b
, causing an erase discharge at each of the discharge cells to erase sustain discharge.
With the operations described above, one frame of image is displayed on the panel by the use of light emitted during sustain discharge.
Referring to
FIG. 8
, there is illustrated a schematic enlarged plan view of a part of the panel shown in
FIG. 6
, in particular electrodes positioned in rows from (
2
K-
1
) to (
2
K). In this drawing, sustain discharge current flowing at the first sustain discharge in sustain period is shown. In particular in this drawing, bold arrows indicate the directions along which sustain discharge current flows in respective electrodes, and normal arrows indicate the directions along which sustain discharge current flows from one electrode to another. As can be seen from the drawing, the direction that sustain electrode current flows in the odd scan and sustain electrodes, SCN(
2
K-
1
) and (
2
K-
1
), is opposite to that sustain discharge current in the even scan and sustain electrodes, SCN(
2
K) and SUS(
2
K). With this opposite flows of sustain discharge current in the odd and even electrodes, a vector of electromagnetic wave caused from the odd scan and sustain electrodes, SCN(
2
K-
1
) and SUS(
2
K-
1
) opposes to and counteracts another vector of that caused from the even scan and sustain electrodes, SCN(
2
K

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