Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-07-15
2001-08-14
Hjerpe, Richard (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S067000, C315S169400
Reexamination Certificate
active
06275203
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a plasma display panel, and more particularly to a plasma display panel of the AC (Alternating Current) type and the surface discharge type.
2. Description of the Related Art
Conventionally, various image display apparatus are utilized, and one of such image display apparatus is an apparatus called plasma display panel.
The plasma display panels an image by causing a phosphor to emit light by discharge and is anticipated as a display in the form of a flat plane which spontaneously emits light in a high luminance.
Plasma display panels of the type mentioned are divided into two types of a DC (Direct Current) type and an AC type. Since an AC plasma display panel has electrodes which are not exposed to a discharge space, it is superior in durability to a plasma display panel of the DC type whose electrodes are exposed to a discharge space.
Also AC plasma display panels are divided into two types including an opposing type and a surface discharge type. While electrodes of a plasma display panel of the opposing type which extend in perpendicular directions to each other are opposed to each other, a plasma display panel of the surface discharge type includes surface discharging electrodes which include scanning electrodes and sustain electrodes in combination and are arranged on a plane.
A plasma display panel of the surface discharge type of the AC type is anticipated as a large-size full-color flat display since it has a wide memory margin and a high light emission efficiency.
Such a plasma display panel of the surface discharge type of the AC type as described above is disclosed, for example, in Japanese Patent Laid-open No. 320667/96.
Japanese Patent Laid-open No. 320667/96 discloses that some wiring patterns are omitted by devising a driving method.
Here, the plasma display panel disclosed is described below as a conventional example with reference to
FIGS. 1
to
3
.
It is to be noted here that, in order to simplify the description, the horizontal direction of
FIG. 1
is referred to as the row direction while the vertical direction is referred to as the column direction. The row direction is a direction parallel to the rows, and a plurality of columns are arranged successively in the row direction. The column direction is the direction parallel to the columns, and a plurality of rows are arranged in the column direction.
Plasma display panel
1
of the surface discharge type of the AC type described as an example here includes, as shown in
FIG. 1
, display panel
2
and drive circuit
3
. Display panel
2
and drive circuit
3
are connected to each other.
On display panel
2
, n surface discharge electrodes
11
parallel to the row direction are successively arranged in the column direction. Each of the surface discharge electrodes
11
is composed of scanning electrode
12
arranged at a higher location and sustain electrode
13
located at a lower location.
Positioned on the rear side of surface discharge electrodes
11
is discharge space
16
in which gas of a phosphor is enclosed. On the rear side of surface discharge electrodes
11
, m data electrodes
14
parallel to the column direction are successively arranged in the row direction.
In particular, as shown in
FIG. 2
, scanning electrodes
12
and sustain electrodes
13
which compose surface discharge electrodes
11
are formed by printed wiring lines on the rear face of transparent substrate
17
. Data electrodes
14
are formed from printed wiring lines on the front face of transparent substrate
18
formed as a separate member.
Phosphor
20
is positioned on the front face of each of data electrodes
14
with dielectric
19
interposed therebetween, and discharge space
16
is formed at a position opposing phosphor
20
.
As described above, n surface discharge electrodes
11
and m data electrodes
14
extend perpendicularly to each other with discharge space
16
interposed therebetween. Each of n×m intersecting points between n surface discharge electrodes
11
and m data electrodes
14
with discharge space
16
interposed therebetween serves as pixel
15
which emits light individually.
As shown in
FIG. 1
, one scanning wiring line
21
is connected to the left ends of n scanning electrodes
12
. One scanning driver
22
is connected to this one scanning wiring line
21
.
One sustain wiring line
23
is connected commonly to the right ends of n sustain electrodes
13
. One sustain driver
24
is connected to this one sustain wiring line
23
.
m data drivers (not shown) are individually connected to m data electrodes
14
. Drive circuit
3
is formed by such various drivers
22
. . . as described above.
It is to be noted that planar grounding electrodes (not shown) are formed on the rear faces of electrodes
12
to
14
arranged in such a manner as described above. A ground potential is applied to the grounding electrodes.
Plasma display panel
1
of the surface discharge type of the AC type having such a structure as described above can display a desired image in a dot matrix system by individually controlling n×m pixels arranged in a matrix so that they should or should not emit light.
Here, a driving method for plasma display panel
1
having the construction described above is described with reference to FIG.
3
.
First, as a preparation operation, n scanning drivers
22
and one sustain driver
24
apply a predischarge pulse to n scanning electrodes
12
and sustain electrodes
13
. Consequently, by the predischarge, display panel
2
is put into a condition wherein discharge of an image display is executed stably.
Then, n scanning drivers
22
apply scanning pulses SC
1
to SCn, whose timings are successively shifted relative to each other, individually to n scanning electrodes
12
, and in synchronism with the timings, the m data drivers apply data pulses to particular data electrodes
14
which correspond to an image to be displayed.
Consequently, the positions of all pixels
15
are successively scanned, and wall charge is written into only those pixels
15
which correspond to the image. Thus, n scanning drivers
22
apply sustain pulses B to all of n scanning electrodes
12
, and single sustain driver
24
applies sustain pulses A to all of n sustain electrodes
13
.
In this instance, since the generation timings of sustain pulses A applied to scanning electrodes
12
and sustain pulses B applied to sustain electrodes
13
are different from each other, a first condition wherein current flows from scanning electrodes
12
to sustain electrodes
13
as seen in
FIG. 1 and a
second condition (not shown) wherein current flows from sustain electrodes
13
to scanning electrodes
12
occur alternately.
Since the direction of sustain pulses supplied to surface discharge electrodes
11
is reversed between the first condition and the second condition, discharge occurs only at the positions of those pixels
15
to which the wall charge has been written, and only the phosphors of those pixels
15
emit light to display an image.
However, when an image is displayed in such a manner as described above, the sustain pulses to be applied to electrodes
12
,
13
are required to have a peak value of approximately several hundreds volt and a frequency of several hundreds kilohertz since electrodes
12
,
13
cause the phosphors to emit light by discharge.
In plasma display panel
1
described above, the feeding direction between electrodes
12
,
13
is reversed between the first condition and the second condition. In particular, in the first condition, current is fed from the left to the right in all of surface discharge electrodes
11
, and this is reversed in the second condition.
If current is fed in the same direction in the large number of surface discharge electrodes
11
in this manner, then since electric fields and magnetic fields are generated in high intensities, they have a bad influence as magnetic noise and electric field noise upon the surroundings.
Further, current supplied from one end of each of ele
Eisen Alexander
Hjerpe Richard
NEC Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
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