Plasma display apparatus
AssigneeFujitsu Hitachi Plasma Display Limited
InventorsMasanori Takeuchi, Yasuji Noguchi, Yutaka Chiaki, Shunji Oota
Life of this patent
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Abstract
A plasma display apparatus, in which the display quality of a dark image is improved and which uses a subfield method, has been disclosed. The plasma display apparatus comprises a plasma display panel, a sustain pulse cycle changing means for detecting the display load ratio of each subfield and changing the sustain pulse cycle of each subfield according to the display load ratio, and an adaptive subfield number changing means for calculating a vacant time in a display frame generated by changing the sustain pulse cycle, judging whether a subfield can be added according to the vacant time, and determining the number of subfields in the display frame.
Claims22
A plasma display apparatus, which performs a gradated display using a subfield method, comprising:
- a plasma display panel having a plurality of scan electrodes and a plurality of sustain electrodes extending in the same direction and being arranged adjacent to each other, and a plurality of address electrodes extending in a direction intersecting at that of the plurality of scan electrodes and the plurality of sustain electrodes;
- sustain pulse cycle changing circuitry detecting a display load ratio of each subfield of a plurality of subfields, and shortening a sustain pulse cycle of each respective subfield of the plurality of subfields in which the detected display load ratio of the respective subfield is less than a predetermined value;
- and
- adaptive subfield number changing circuitry calculating a vacant time in a display frame generated by said shortening, judging whether a subfield is to be added according to the calculated vacant time, and determining the number of subfields in the display frame according to said judging.
A plasma display apparatus, which performs the gradated display using a subfield method, comprising:
- a plasma display panel having a plurality of scan electrodes and a plurality of sustain electrodes extending in the same direction and being arranged adjacent to each other, and a plurality of address electrodes extending in a direction perpendicular to that of the plurality of scan electrodes and the plurality of sustain electrodes;
- sustain pulse cycle changing circuitry detecting a display load ratio of each subfield of a plurality of subfields when a display is performed by a predetermined subfield configuration, and shortening the sustain pulse cycle of each respective subfield of the plurality of subfields in which the detected display load ratio of the respective subfield is less than a predetermined value;
- and
- adaptive subfield configuration setting circuitry calculating a vacant time in a display frame generated by said shortening, judging whether a display is to be performed by another subfield configuration according to the calculated vacant time, and determining a subfield configuration in the display frame according to said judging.
A driving method of a plasma display apparatus by performing a gradated display using a subfield method, comprising:
- detecting a display load ratio for each subfield of a plurality of subfields;
- shortening a sustain pulse cycle of each respective subfield of the plurality of subfields in which the detected display load ratio of the respective subfield is less than a predetermined value;
- calculating a vacant time in a display frame generated by said shortening sustain pulse cycle;
- judging whether a subfield is to be added according to the calculated vacant time;
- and
- determining the number of subfields in the display frame according to said judging.
A driving method of a plasma display apparatus by performing a gradated display using a subfield method, comprising:
- detecting the display load ratio of each subfield of a plurality of subfields;
- shortening, when a display is performed by a predetermined subfield configuration. a sustain pulse cycle of each respective subfield of the plurality of subfields in which the detected display load ratio of the respective subfield is less than a predetermined value;
- calculating a vacant time in a display frame generated by said shortening;
- judging whether a display is to be performed by another subfield configuration according to the calculated vacant time;
- and
- determining a subfield configuration in the display frame according to said judging.
A method comprising:
- detecting a display load ratio of each subfield of a plurality of subfields of a display frame of a plasma display panel, each subfield of the plurality of subfields having a sustain pulse applied to the respective subfield;
- shortening a sustain pulse cycle of the sustain pulse applied to each subfield of the plurality of subfields in which the detected display load ratio is less than a predetermined value calculating a vacant time in the display frame generated by said shortening;
- judging whether a subfield is to be added to the display frame according to the calculated vacant time;
- and
- determining a subfield configuration of the display frame according to said judging.
An apparatus comprising:
- means for detecting a display load ratio of each subfield of a plurality of subfields of a display frame of a plasma display panel, each subfield of the plurality of subfields having a sustain pulse applied to the respective subfield;
- means for shortening a sustain pulse cycle of the sustain pulse applied to each subfield of the plurality of subfields in which the detected display load ratio is less than a predetermined value;
- means for calculating a vacant time in the display frame generated by the shortening of the sustain pulse cycle of the sustain pulse applied to each subfield of the plurality of subfields in which the detected display load ratio is less than a predetermined value;
- means for judging whether a subfield is to be added to the display frame according to the calculated vacant time;
- and
- means for determining a subfield configuration of the display frame according to the judging whether a subfield is to be added to the display frame according to the calculated vacant time.
Dependencies are inferred from the claim text.