Plasma display device and driving method thereof
AssigneeSamsung SDI Co., Ltd.
InventorsByunggwon CHO, Jungsoo An
Life of this patent
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Abstract
A plasma display device and a driving method thereof prevent a dark image retention by controlling a number of pulses applied in a reset period of a current frame compared to the number of pulses applied in a reset period of a previous frame. The driving method includes applying a first number of reset pulses to a scan electrode of the plasma display device in the reset period of the current frame and a second number of the reset pulses to the scan electrode in the reset period of the previous frame such that the first number of reset pulses applied in the reset period of the current frame is larger the second number of reset pulses applied in the reset period of the previous frame if the dark image is determined to be retained.
Claims20
A plasma display device, comprising:
- a plasma display panel including a plurality of address electrodes, a plurality of sustain electrodes, and a plurality of scan electrodes;
- a scan electrode driver connected to the plasma display panel to apply a number of reset pulses to a scan electrode of the plurality of the scan electrodes in a reset period;
- and
- a controller connected to the scan electrode driver to control a first number of reset pulses applied to the scan electrode in a reset period of a current frame and a second number of reset pulses applied to the scan electrode in a reset period of a previous frame,
- wherein the first number of reset pulses and the second number of reset pulses are different if the previous frame having a first screen load factor includes a still image, the still image being continuously sustained for a duration time greater than a predetermined time, and the current frame having a second screen load factor includes an image different from the still image, and the second screen load factor is less than the first screen load factor.
A driving method of a plasma display device having a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes, the driving method comprising:
- dividing one frame into a plurality of subfields having a number of emissions;
- dividing each subfield into a reset period, an address period, and a sustain period;
- displaying in a previous frame having a first screen load factor a still image that is continuously sustained for a duration time greater than a predetermined time;
- displaying an image of a current frame having a second screen load factor, the image of the current frame being different from the still image;
- determining in a controller whether the second screen load factor is less than the first screen load factor;
- and
- controlling a first number of reset pulses applied to a scan electrode of the plurality of scan electrodes in the reset period of the current frame and a second number of reset pulses applied to the scan electrode of the plurality of scan electrodes in the reset period of the previous frame,
- wherein the first number and second number are different if the second screen load factor is less than the first screen load factor.
Dependencies are inferred from the claim text.