Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1999-11-16
2003-05-20
Hjerpe, Richard (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C315S169100, C315S169400, C345S067000, C345S068000
Reexamination Certificate
active
06567059
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a driving apparatus for a plasma display panel (hereinafter called “PDP”) of a matrix display type.
2. Description of the Related Background Art
Various studies have been made on PDPs which are thin flat display devices, and one of those PDPs is a matrix display type of PDP.
FIG. 1
is a diagram showing the constitution of a driving apparatus for the matrix display type of PDP.
In
FIG. 1
, row electrodes Y
1
to Y
n
and row electrodes X
1
to X
n
, each pair of which corresponds to a single one of rows of one screen (the first row to the n-th row), are formed on a PDP
1
. Column electrodes D
1
to D
m
which correspond to the respective columns of one screen (the first column to the n-th column) are formed perpendicular to those row electrodes each with an unillustrated dielectric layer and discharge space provided in between. Each discharge cell corresponding to a single pixel is formed at the intersection of one pair of row electrodes and a single column electrode.
An address driver
2
converts pixel data of individual pixels based on a video signal to pixel data pulses DP
1
to DP
n
whose voltage values correspond to the logic levels of the individual pieces of the pixel data, and applies the pixel data pulses to the column electrodes D
1
-D
m
row by row. A row-X electrode driver
3
generates a reset pulse for initializing the amount of the residual wall charges of each discharge cell and a discharge sustain pulse for maintaining the discharge state of each light-emitting discharge cell to be discussed later, and applies those pulses to the row electrodes X
1
-X
n
.
A row-Y electrode driver
4
, like the row-X electrode driver
3
, generates reset pulses each for initializing the amount of the residual wall charges of the associated discharge cell and discharge sustain pulses each for maintaining the discharge state of each light-emitting discharge cell, and applies those pulses to the row electrodes Y
1
-Y
n
. The row-Y electrode driver
4
also generates priming pulses for reforming the charge particles that are generated in individual discharge cells and scan pulses each for producing charges whose amount corresponds to the pixel data pulse in the associated discharge cell to thereby set a light-emitting discharge cell or a non-emitting discharge cell, and applies those pulses to the row electrodes Y
1
-Y
n
.
FIG. 2
shows the specific constitutions of the row-X electrode driver
3
and the row-Y electrode driver
4
with respect to an electrode X
j
and an electrode Y
j
. The electrode X
j
is the j-th one of the electrodes X
1
-X
n
and the electrode Y
j
the j-th one of the electrodes Y
1
-Y
n
. The part between the electrodes X
j
and Y
j
serves as a capacitor C
0
.
The row-X electrode driver
3
is equipped with two power supplies B
1
and B
2
. The power supply B
1
provides a voltage V
s1
(for example, 170 V), and the power supply B
2
provides a voltage V
r1
(for example, 190 V). The positive terminal of the power supply B
1
is connected via a switching element S
3
to a connection line
11
for the electrode X
j
, with the negative terminal grounded. A switching element S
4
is connected between the connection line
11
and the ground, and a series circuit of a switching element S
1
, a diode D
1
and a coil L
1
and a series circuit of a coil L
2
, a diode D
2
and a switching element S
2
are both connected via a capacitor C
1
to the ground. The end of the diode D
1
on that side of the capacitor C
1
serves as an anode, and the end of the diode D
2
on that side of the capacitor C
1
serves as a cathode. The positive terminal of the power supply B
2
is connected via a switching element S
8
and a resistor R
1
to the connection line
11
, with the negative terminal grounded.
The row-Y electrode driver
4
is equipped with four power supplies B
3
to B
6
. The power supply B
3
provides a voltage V
s1
(for example, 170 V), the power supply B
4
provides a voltage V
r1
(for example, 190 V), the power supply B
5
provides a voltage V
off
(for example, 140 V) and the power supply B
6
provides a voltage V
h
(for example, 160 V; V
h
>V
off
). The positive terminal of the power supply B
3
is connected via a switching element S
13
to a connection line
12
for a switching element S
15
, with the negative terminal grounded. A switching element S
14
is connected between the connection line
12
and the ground, and a series circuit of a switching element S
11
, a diode D
3
and a coil L
3
and a series circuit of a coil L
4
, a diode D
4
and a switching element S
12
are both connected via a capacitor C
2
to the ground. The end of the diode D
3
on that side of the capacitor C
2
serves as an anode, and the end of the diode D
4
on that side of the capacitor C
2
serves as a cathode.
The connection line
12
is connected via a switching element S
15
to a connection line
13
for the positive terminal of the power supply B
6
. The power supply B
4
has a positive terminal grounded and a negative terminal connected via a switching element S
16
and a resistor R
2
to the connection line
13
. The power supply B
5
has a positive terminal connected via a switching element S
17
to the connection line
13
and a negative terminal grounded.
The connection line
13
is connected via a switching element S
21
to a connection line
14
for the electrode Y
j
. The negative terminal of the power supply B
6
is connected via a switching element S
22
to the connection line
14
. A diode D
5
is connected between the connection lines
13
and
14
. A series circuit of a switching element S
23
and a diode D
6
is also connected between the connection lines
13
and
14
. The end of the diode D
5
on that side of the connection line
14
serves as an anode, and the end of the diode D
6
on that side of the connection line
14
serves as a cathode.
The on/off actions of the switching elements S
1
-S
4
, S
8
, S
11
-S
17
and S
21
-S
23
are controlled by a control circuit (not shown). The arrows at the individual switching elements in
FIG. 2
indicate terminals for control signals from the control circuit.
In the row-Y electrode driver
4
, the power supply B
3
, the switching elements S
11
-S
15
, the coils L
3
and L
4
, the diodes D
3
and D
4
and the capacitor C
2
constitute a sustain driver portion, the power supply B
4
, the resistor R
2
and the switching element S
16
constitute a reset driver portion, and the remaining power supplies B
5
and B
6
, switching elements S
13
, S
17
, S
21
and S
22
and diodes D
5
and D
6
constitute a scan driver portion.
The operation of the PDP driving apparatus with the above constitution will now be explained with reference to a timing chart in FIG.
3
. The operation of the PDP driving apparatus consists of a reset period, an address period and a sustain period.
First, in the reset period, the switching element S
23
in the row-Y electrode driver
4
is set on. The switching element S
23
becomes an on state both in the reset period and sustain period. At the same time, the switching element S
8
in the row-X electrode driver
3
is turned on and the switching element S
16
in the row-Y electrode driver
4
is turned on. The other switching elements are off. The on state of the switching element S
8
causes a current to flow from the positive terminal of the power supply B
2
to the electrode X
j
through the switching element S
8
and the resistor R
1
, and the on state of the switching element S
16
causes a current to flow from the electrode Y
j
to the negative terminal of the power supply B
4
through the diode D
5
, the resistor R
2
and the switching element S
16
. The potential of the electrode X
j
gradually increases at the rate specified by the time constant of the capacitor C
0
and the resistor R
1
and becomes a reset pulse RP
x
, and the potential of the electrode Y
j
gradually decreases at the rate specified by the time constant of the capacitor C
0
and the resistor R
2
and becomes a reset pulse RP
y
.
Ide Shigeo
Suzuki Masahiro
Hjerpe Richard
Morgan & Lewis & Bockius, LLP
Nguyen Francis
Pioneer Corporation
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