Driving method of plasma display panel and plasma display device
View Patent ↗In a plasma display device comprising: plural first, second, and third electrodes disposed adjacently and extending in a first direction, the third electrodes being provided between the first and second electrodes for repeating discharges; a dielectric layer covering the electrodes; a first electrode driving circuit for driving the first electrodes; a second electrode driving circuit for driving the second electrodes; and a third electrode driving circuit for driving the third electrodes, grayscale display is performed by a sub-field method, and the third electrodes are set to have a potential approximately the same as that of the first or second electrode at the discharge in the repetitive discharges. In this plasma display device, the third electrode driving circuit makes the third electrode operate as an anode at least once at least in one sub-field from minimum luminance and makes it operate as a cathode in the rest thereof.
1. A driving method of a plasma display panel comprising: a plurality of first, second, and third electrodes which are disposed to be adjacent to each other and extending in a first direction,
said third electrodes being provided respectively between said first and second electrodes between which discharges are to be repeated; and
a dielectric layer which covers said plurality of first, second, and third electrodes,
wherein grayscale display is carried out by means of a sub-field method in which the numbers of repeated discharges are allotted to sub-fields in accordance with a luminance ratio, and
at least one sub-field from the sub-field of minimum luminance has luminance lower than luminance corresponding to said number of the repeated discharges.
2. A driving method of a plasma display panel comprising: a plurality of first, second, and third electrodes which are disposed to be adjacent to each other and extending in a first direction,
said third electrodes being provided respectively between said first and second electrodes between which discharges are to be repeated; and
a dielectric layer which covers said plurality of first, second, and third electrodes,
wherein grayscale display is carried out by means of a sub-field method, and said third electrodes are set to have a potential which is approximately the same as the potential of one of said first and second electrodes at least at the time of the discharges during a period when the discharges are repeated between said first and second electrodes, and
in at least one sub-field from the sub-field of minimum luminance, at least one repeated discharge is a discharge in which said third electrodes operate as anodes, and the rest of said repeated discharges are discharges in which said third electrodes operate as cathodes.
3. The driving method of a plasma display panel according to claim 2 ,
wherein said repeated discharges of the sub-field of high luminance are discharges in which said third electrodes operate as cathodes all the time.
4. The driving method of a plasma display panel according to claim 2 ,
wherein, in the at least one sub-field from the sub-field of minimum luminance, said third electrodes operate as cathodes at the time of the first discharge in said repeated discharge period.
5. The driving method of a plasma display panel according to claim 4 ,
wherein, when a state where said third electrodes operate as cathodes is to be switched to a state where said third electrodes operate as anodes in the period when said discharges are repeated, potential of said third electrodes is changed in synchronization with a potential change of said first or second electrodes which are to be subsequently operated as anodes.
6. A plasma display device comprising:
a plasma display panel including a plurality of first, second, and third electrodes which are disposed to be adjacent to each other and extending in a first direction, said third electrodes being provided respectively between said first and second electrodes between which discharges are to be repeated, and a dielectric layer which covers said plurality of first, second, and third electrodes;
a first electrode driving circuit for driving said plurality of first electrodes;
a second electrode driving circuit for driving said plurality of second electrodes; and
a third electrode driving circuit for driving said plurality of third electrodes,
wherein grayscale display is carried out by means of a sub-field method in which the numbers of repeated discharges are allotted to sub-fields in accordance with a luminance ratio, and
at least one sub-field from the sub-field of minimum luminance has luminance lower than luminance corresponding to said number of the repeated discharges.
7. A plasma display device comprising:
a plasma display panel including a plurality of first, second, and third electrodes which are disposed to be adjacent to each other and extending in a first direction, said third electrodes being provided respectively between said first and second electrodes between which discharges are to be repeated, and a dielectric layer which covers said plurality of first, second, and third electrodes;
a first electrode driving circuit for driving said plurality of first electrodes;
a second electrode driving circuit for driving said plurality of second electrodes; and
a third electrode driving circuit for driving said plurality of third electrodes,
wherein grayscale display is carried out by means of a sub-field method, and said third electrodes are set to have a potential which is approximately the same as the potential of one of said first and second electrodes at least at the time of the discharges during a period when the discharges are repeated between said first and second electrodes, and
in at least one sub-field from the sub-field of minimum luminance, said third electrode driving circuit makes said third electrodes operate as anodes in at least one repeated discharge, and said third electrode driving circuit makes said third electrodes operate as cathodes in the rest of said repeated discharges.
8. The plasma display device according to claim 7 ,
wherein said third electrode driving circuit makes said third electrodes operate only as cathodes in said repeated discharge period in the sub-field of high luminance.
9. The plasma display device according to claim 7 ,
wherein said third electrode driving circuit makes the third electrodes operate as cathodes at the time of the first discharge in said repeated discharge period.
10. The plasma display device according to claim 9 ,
wherein, when a state where said third electrodes operate as cathodes is to be switched to a state where said third electrodes operate as anodes in the period when said discharges are repeated, said third electrode driving circuit changes potential of said third electrodes in synchronization with a potential change of said first or second electrodes which are to be subsequently operated as anodes.
11. The plasma display device according to claim 7 ,
wherein said third electrode driving circuit controls the ratio of the number of discharges in which said third electrodes operate as anodes to the number of repeated discharges so that it is increased in the sub-field of lower luminance.
12. The plasma display device according to claim 7 ,
wherein said plurality of first and second electrodes form pairs, and said third electrode is provided between said first electrode and said second electrode of each pair, and
said third electrode driving circuit applies a common potential to said plurality of third electrodes.
13. The plasma display device according to claim 7 , wherein said plurality of third electrodes are provided between all of said plurality of first electrodes and said plurality of second electrodes, and
an odd-number field in which repetitive discharges for display are performed between said second electrodes and said first electrodes adjacent to one side of said second electrodes and an even-number field in which the repetitive discharges for display are performed between said second electrodes and said first electrodes adjacent to the other side of said second electrodes are provided.