Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2002-01-03
2004-09-14
Hjerpe, Richard (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S062000, C345S068000
Reexamination Certificate
active
06791514
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims priority of Japanese Patent Application No. 2001-194823, filed on Jun. 27, 2001, the contents being incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display and a method of driving the same.
2. Description of the Related Art
FIG. 11
is a diagram showing the basic configuration of a plasma display panel device. A control circuit portion
1101
controls an addressing driver
1102
, a common electrode (X electrode) sustaining circuit
1103
, a scanning electrode (Y electrode) sustaining circuit
1104
, and a scanning driver
1105
.
The addressing driver
1102
supplies predetermined voltages to addressing electrodes A
1
, A
2
, A
3
, . . . , Hereinafter, the addressing electrodes A
1
, A
2
, A
3
, . . . are respectively or generally called addressing electrodes Aj, and “j” means a subscript.
The scanning driver
1105
supplies predetermined voltages to scanning electrodes Y
1
, Y
2
, Y
3
, . . . according to the control of the control circuit portion
1101
and the scanning electrode sustaining circuit
1104
. Hereinafter, the scanning electrodes Y
1
, Y
2
, Y
3
, . . . are respectively or generally called scanning electrodes Yi, and “i” means a subscript.
The common electrode sustaining circuit
1103
supplies the same voltage to common electrodes X
1
, X
2
, X
3
, . . . respectively. Hereinafter, the common electrodes X
1
, X
2
, X
3
, . . . are respectively or generally called common electrodes Xi, and “i” means a subscript. The respective common electrodes Xi are connected to one another and have the same voltage level.
In a display region
1107
, the scanning electrodes Yi and the common electrodes Xi form rows extending in parallel in a horizontal direction, and the addressing electrodes Aj form columns extending in a vertical direction. The scanning electrodes Yi and the common electrodes Xi are arranged alternately in the vertical direction. A stripe rib structure in which ribs
1106
are arranged between the addressing electrodes Aj is provided.
The scanning electrodes Yi and the addressing electrodes Aj form a two-dimensional matrix composed of i rows and j columns. Display cells Cij are formed by intersections of the scanning electrodes Yi and the addressing electrodes Aj and the common electrodes Xi adjacent to the intersections correspondingly. The display cells Cij correspond to pixels, and thereby the display region
1107
can display a two-dimensional image.
FIG. 12A
is a diagram showing the sectional structure of the display cell Cij in FIG.
11
. The common electrode Xi and the scanning electrode Yi are formed on a front glass substrate
1211
. Attached thereon is a dielectric layer
1212
to insulate them against a discharge space
1217
, and further attached thereon is an MgO (magnesium oxide) protective film
1213
.
Meanwhile, the addressing electrode Aj is formed on a back glass substrate
1214
disposed facing the front glass substrate
1211
, and attached thereon is a dielectric layer
1215
, and further attached thereon is a phosphor. Ne+Xe Penning gas or the like is sealed in the discharge space
1217
between the MgO protective film
1213
and the dielectric layer
1215
.
FIG. 12B
is a diagram for explaining a capacity Cp of an alternating current drive type plasma display. A capacity Ca is the capacity of the discharge space
1217
between the common electrode Xi and the scanning electrode Yi. A capacity Cb is the capacity of the dielectric layer
1212
between the common electrode Xi and the scanning electrode Yi. A capacity Cc is the capacity of the front glass substrate
1211
between the common electrode Xi and the scanning electrode Yi. The capacity between the electrodes Xi and Yi is determined by the total of these capacities Ca, Cb, and Cc.
FIG. 12C
is a diagram for explaining glowing of the alternating current drive type plasma display. On the inner face of the rib
1216
, red, blue, and green phosphors
1218
are respectively arranged and applied in a stripe pattern, and light
1221
is generated by exciting the phosphors
1218
by discharge between the common electrode Xi and the scanning electrode Yi.
FIG. 13
is a schematic diagram of one frame FR of an image. The image is composed of, for example, 60 frames per second. The one frame FR is composed of a first subframe SF
1
, a second subframe SF
2
, . . . , and a n-th subframe SFn. This “n” is, for example, 10 and corresponds to the number of tone bits. The subframes SF
1
, SF
2
, and so on are respectively or generally called subsrames SF hereinafter.
Each subframe SF is composed of a reset period Tr, an addressing period Ta, and a sustaining period (sustaining discharge period) Ts. During the reset period Tr, the display cells are initialized. During the addressing period Ta, whether to light or not to light the respective display cells can be selected according to address designation. The selected cell glows during the sustaining period Ts. The number of times of glowing (glowing time) differs from one SF to another. Thereby, the tone value can be determined.
FIG. 14
shows a driving method during the sustaining period Ts of a progressive mode plasma display according to a prior art. At a point in time t1, an anode potential Vsa is applied to common electrodes Xn−1, Xn, and Xn+1, and a cathode potential Vsb is applied to scanning electrodes Yn−1, Yn, and Yn+1. Thereby, high voltage is applied respectively between the common electrode Xn−1 and the scanning electrode Yn−1, between the common electrode Xn and the scanning electrode Yn, and between the common electrode Xn+1 and the scanning electrode Yn+1 to generate sustaining discharges
1410
.
Subsequently, at a point in time t2, the cathode potential Vsb is applied to the common electrodes Xn−1, Xn, and Xn+1, and the anode potential Vsa is applied to the scanning electrodes Yn−1, Yn, and Yn+1. Thereby, high voltage is applied respectively between the common electrode Xn−1 and the scanning electrode Yn−1, between the common electrode Xn and the scanning electrode Yn, and between the common electrode Xn+1 and the scanning electrode Yn+1 to generate the sustaining discharges
1410
.
Thereafter, at a point in time t3, the sustaining discharges
1410
are generated by applying the same potentials as at the point in time t1, and at a point in time t4, the sustaining discharges
1410
are generated by applying the same potentials as at the point in time t3.
FIG. 15
shows a driving method during the sustaining period Ts of an ALIS (Alternate Lighting of Surfaces) mode plasma display according to the prior art. At the point in time t1, the anode potential Vsa is applied to the common electrodes Xn−1 and Xn+1 in odd-numbered lines, and the cathode potential Vsb is applied to the scanning electrodes Yn−1 and Yn+1 in odd-numbered lines. Then, the cathode potential Vsb is applied to the common electrode Xn in an even-numbered line, and the anode potential Vsa is applied to the scanning electrode Yn in an even-numbered line. Thereby, high voltage is applied respectively between the common electrode Xn−1 and the scanning electrode Yn−1, between the common electrode Xn and the scanning electrode Yn, and between the common electrode Xn+1 and the scanning electrode Yn+1 to generate sustaining discharges
1510
.
Subsequently, at the point in time t2, the cathode potential Vsb is applied to the common electrodes Xn−1 and Xn+1 in the odd-numbered lines, and the anode potential Vsa is applied to the scanning electrodes Yn−1 and Yn+1 in the odd-numbered lines. Then, the anode potential Vsa is applied to the common electrode Xn in the even-numbered line, and the cathode potential Vsb is applied to the scanning electrode Yn in the even-numbered line. Thereby, high voltage is applied respectively between the common electrode Xn−1 and
Kishi Tomokatsu
Setoguchi Noriaki
Alphonse Fritz
Fujitsu Hitachi Plasma Display Limited
Hjerpe Richard
Staas & Halsey , LLP
LandOfFree
Plasma display and method of driving the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plasma display and method of driving the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plasma display and method of driving the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3194534