Method and device for driving plasma display panel
AssigneeFujitsu Limited
InventorsKenji Awamoto, Seiichi Iwasa
Life of this patent
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Abstract
A plasma display device having display electrode pairs and providing improved luminance and light emission efficiency of display discharges with reduced variations of the luminance and light emission efficiency thereof resulting from variations of a display load. A discharge is generated by applying an offset drive voltage that is higher than a sustain voltage applied to the display electrode pair, and applying the sustain voltage for a constant period after dropping the applied voltage from an offset drive voltage to the sustain voltage after generating the display discharge. The drive output state is set to a low impedance state at least during a time period from the start of applying the offset drive voltage until the applied voltage drops to the sustain voltage.
Claims9
A method for driving an AC type plasma display panel in which a voltage pulse train is applied to a display electrode pair so that display discharge is generated plural times in accordance with luminance of image to be displayed, wherein
- a driving step of one pulse for generating display discharge one time includes the steps of generating display discharge by applying an offset drive voltage that is a sustain voltage plus an auxiliary voltage having the same polarity to the display electrode pair, and applying the sustain voltage for a constant period after dropping the applied voltage from the offset drive voltage to the sustain voltage after generating the display discharge, and
- a conductive connection state between a power source for supplying an application voltage and the display electrode is a low impedance state that enables current supply from the power source to the display electrode pair at least from the application start of the offset drive voltage until the applied voltage drops to the sustain voltage.
A device for driving an AC type plasma display panel in which a voltage pulse train is applied to a display electrode pair so that display discharge is generated plural times in accordance with luminance of image to be displayed, the device comprising;
- a normal pulse generating circuit for applying a sustain voltage intermittently to the display electrode pair;
- an auxiliary pulse generating circuit for applying an auxiliary voltage intermittently to the display electrode pair;
- an impedance conversion circuit for reducing an output impedance of the auxiliary pulse generating circuit to the display electrode pair;
- and
- a controller for applying the auxiliary voltage during the application of the sustain voltage and for controlling the normal pulse generating circuit and the auxiliary pulse generating circuit so that the application of the sustain voltage continues after stopping the application of the auxiliary voltage for a constant period.
A device for driving an AC type plasma display panel in which a voltage pulse train is applied to a display electrode pair so that display discharge is generated plural times in accordance with luminance of image to be displayed, the device comprising;
- a normal pulse generating circuit for applying a sustain voltage intermittently to the display electrode pair,
- an offset drive pulse generating circuit for applying an offset drive voltage that is the sustain voltage plus an auxiliary voltage to the display electrode pair intermittently;
- an impedance conversion circuit for reducing output impedance of the offset drive pulse generating circuit to the normal pulse generating circuit;
- a diode for forming a forward direction electric path between the impedance conversion circuit and the normal pulse generating circuit;
- and
- a controller for applying the auxiliary voltage during the application of the sustain voltage and for controlling the normal pulse generating circuit and the offset drive pulse generating circuit so that the application of the sustain voltage continues after stopping the application of the auxiliary voltage for a constant period.
Dependencies are inferred from the claim text.