Method and device for driving plasma display panel
AssigneeFujitsu Limited
InventorsKenji Awamoto, Kunio Takayama
Life of this patent
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Abstract
A method for driving a plasma display panel is provided, in which an addressing unsusceptible to influence of a variation of operating environment without increasing withstand voltage of circuit components. The method comprises the steps of replacing a frame with a plurality of subframes having luminance weights, setting on or off of light emission of cells for each of the subframes so as to realize a gradation display and providing a drive halt period between at least one of the plural subframe periods allocated to each of the subframes and the next subframe period only when a display load exceeds a preset value.
Claims7
A method of driving a plasma display panel, comprising:
- replacing a frame with three or more subframes having luminance weights;
- setting light emission of cells on or off for each of the subframes so as to realize a gradation display;
- providing a drive halt period after a final subframe period in a frame in which a sum of subframe periods that are allocated to the subframes is shorter than a frame period, when a temperature of a panel surface is not more than a preset temperature, the drive halt period having a length corresponding to a difference between the frame period and the sum of the subframe periods;
- providing a plurality of drive halt periods having length weights corresponding to a luminance weight arrangement in a frame in which the sum of the subframe periods is shorter than the frame period, when the temperature of the panel surface exceeds the preset temperature;
- and
- allocating a free time that is the difference between the frame period and the sum of the subframe periods to the plurality of drive halt periods in accordance with the length weights thereof.
A device for driving a plasma display panel, the device realizing a gradation display by replacing a frame with three or more subframes having luminance weights and by controlling on or off intervals of light emission of cells for each of the subframes, wherein:
- a drive halt period is provided after a final subframe period in a frame in which a sum of subframe periods that are allocated to the subframes is shorter than a frame period, when a temperature of a panel surface is not more than a preset temperature, the drive halt period having a length corresponding to a difference between the frame period and the sum of the subframe periods;
- a plurality of drive halt periods is provided that have length weights corresponding to a luminance weight arrangement in a frame in which the sum of the subframe periods is shorter than the frame period, when the temperature of the panel surface exceeds the preset temperature;
- and
- a free time that is the difference between the frame period and the sum of the subframe periods is allocated to the plurality of drive halt periods in accordance with the length weights thereof.
A display device comprising an AC type plasma display panel and a driving device for driving the plasma display panel, the driving device realizing a gradation display by replacing a frame with three or more subframes having luminance weights and by controlling on or off intervals of light emission of cells for each of the subframes, wherein:
- a drive halt period is provided after a final subframe period in a frame in which a sum of subframe periods that are allocated to the subframes is shorter than a frame period, when a temperature of a panel surface is not more than a preset temperature, the drive halt period having a length corresponding to a difference between the frame period and the sum of subframe periods;
- a plurality of drive halt periods is provided that have length weights corresponding to a luminance weight arrangement in a frame in which the sum of the subframe periods is shorter than the frame period, when the temperature of the panel surface exceeds the preset temperature;
- and
- a free time that is the difference between the frame period and the sum of the subframe periods is allocated to the plurality of drive halt periods in accordance with the length weights thereof.
Dependencies are inferred from the claim text.