Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2000-08-09
2003-03-11
Chow, Dennis-Doon (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S066000, C345S067000
Reexamination Certificate
active
06531994
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of driving an AC-type plasma display panel (hereinafter, also referred to as “AC-type PDP”) in which adjacent two scanning lines share one sustain discharge electrode and a discharge separator for separating surface discharges in discharge cells of the adjacent scanning lines is provided, and a plasma display device which drives the AC-type PDP by using the driving method.
2. Description of the Background Art
An AC-type PDP having a structure in which adjacent two scanning lines share one sustain discharge electrode is well known. The AC-type PDP having such a structure is disclosed in Japanese Patent Application Laid Open Nos. 2-220330 (1990), 6-289809 (1994) and the like. In such an AC-type PDP, when there are 2N scanning lines, only (2N+1) sustain discharge electrodes are needed.
In general, each sustain discharge electrode includes a transparent electrode and a bus electrode. The transparent electrode has a strip-like shape and the bus electrode is provided on the transparent electrode along a central axis in a width direction of the transparent electrode.
A front substrate and a rear substrate of the AC-type PDP are provided face to face with each other with a plurality of stripe-shaped barrier ribs (also simply referred to as “ribs”) extending in a direction of intersecting the sustain discharge electrodes interposed therebetween. In this case, the discharge cells are defined by the barrier ribs in a longitudinal direction of the sustain discharge electrode, i.e., a direction of intersecting the scanning lines.
As discussed above, in the AC-type PDP of the background art, adjacent two scanning lines share one sustain discharge electrode. Therefore, if there is no structure to separate a surface discharge between two sustain discharge electrodes defining one scanning line from a surface discharge in the adjacent scanning line, the surface discharge generated in the discharge cell belonging to one of the scanning lines has an effect on the other scanning line. For example, a discharge cell which should not be illuminated is illuminated.
SUMMARY OF THE INVENTION
The present invention is directed to a method of driving an AC-type plasma display panel. According to a first aspect of the present invention, in the method of driving an AC-type plasma display panel, the AC-type plasma display panel comprises: a first substrate including a plurality of sustain discharge electrodes extending in parallel with one another, between adjacent two of which each of a plurality of scanning lines is defined, each of the sustain discharge electrodes is shared by adjacent two of the scanning lines, and a dielectric layer covering the sustain discharge electrodes, the dielectric layer having a main surface on which surface discharges are generated, the surface discharges illuminating discharge cells belonging to each of the scanning lines; a second substrate provided on a side of the main surface of the dielectric layer face to face with the first substrate, the second substrate including a plurality of address electrodes provided in a direction to intersect the sustain discharge electrodes, the address electrodes extending in parallel with one another; a plurality of barrier ribs provided between the first and second substrates, in parallel with the address electrodes; and a discharge separator provided on a boundary of the adjacent two scanning lines, for separating the surface discharges in the discharge cells belonging to the adjacent two scanning lines, and in the method of the first aspect, one screen is divided into a plurality of sub-fields, each of the plurality of sub-fields including a reset period for erasing electric charges accumulated in the discharge cells; a writing period for performing sequentially a selection of the scanning lines by applying scanning-line selection voltages of different values to adjacent two of the sustain discharge electrodes to scan the scanning lines and performing a writing operation in synchronization with the selection of the scanning lines, in which voltages according to ON/OFF states of image data of a selected scanning line are applied to the address electrodes, to generate a writing discharge in the discharge cell belonging to the address electrode to which the voltage corresponding to the ON state is applied; and a sustain period for performing a discharge sustain operation in which a sustain voltage is applied to the sustain discharge electrodes, to generate the surface discharge in the discharge cell in which the writing discharge is generated, and the electric charges are erased enough in all of the discharge cells belonging to the adjacent two scanning lines in the reset period, the scanning lines are divided into a plurality of groups and the writing operation is performed on a group-by-group basis in the writing period, and the discharge sustain operation is performed on all of the discharge cells belonging to the adjacent two scanning lines in the sustain period.
According to a second aspect of the present invention, in the method of driving an AC-type plasma display panel according to the first aspect, assuming that one of the sustain discharge electrodes shared by the adjacent two scanning lines is a first sustain discharge electrode, one of the sustain discharge electrodes defining one of the adjacent two scanning lines with the first sustain discharge electrode is a second sustain discharge electrode and one of the sustain discharge electrodes defining the other of the adjacent two scanning lines with the first sustain discharge electrode is a third sustain discharge electrode, a potential difference of the second sustain discharge electrode to the first sustain discharge electrode at selection of the one of the adjacent two scanning lines and a potential difference of the third sustain discharge electrode to the first sustain discharge electrode at selection of the other of the adjacent two scanning lines are made reverse in polarity to each other.
According to a third aspect of the present invention, in the method of driving an AC-type plasma display panel according to the first or second aspect, a discharge inhibition voltage for inhibiting generation of the writing discharge is applied to at least one of the two sustain discharge electrodes defining the scanning line when the corresponding scanning line is not selected in the writing period.
According to a fourth aspect of the present invention, in the method of driving an AC-type plasma display panel according to the third aspect, the scanning-line selection voltage is applied to the other of the two sustain discharge electrodes during a period from the start of the scanning on the group to which the corresponding scanning line belongs to at least the end of the selection of the corresponding scanning lines.
According to a fifth aspect of the present invention, in the method of driving an AC-type plasma display panel according to the third or fourth aspect, the scanning lines are divided into the groups so that the scanning lines belonging to the same group are not adjacent to one another, and the discharge inhibition voltage is applied to the sustain discharge electrode defining the scanning line, belonging to the groups not to be scanned, which is adjacent to the other of the two sustain discharge electrodes, during the scanning on the group to be scanned.
According to a sixth aspect of the present invention, in the method of driving an AC-type plasma display panel according to the fifth aspect, the scanning-line selection voltage is continuously applied to the other of the two sustain discharge electrodes during the scanning.
According to a seventh aspect of the present invention, in the method of driving an AC-type plasma display panel according to any one of the first to sixth aspects, the polarity of electric charges is reversed, the electric charges being produced by the writing discharge and accumulated above each of the sustain discharge electrodes of the discharge cell
Birch & Stewart Kolasch & Birch, LLP
Chow Dennis-Doon
LandOfFree
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