Patent ID: 8502749
Filing Date: 2013-08-06
Classification: G09G

Abstract:
1. A plasma display device comprising: a plasma display panel that is driven by a subfield method and has a plurality of discharge cells, each of the discharge cells having a display electrode pair that includes a scan electrode and a sustain electrode, wherein the subfield method includes: an electric power recovering circuit for raising or falling a sustain pulse by resonating an inductor and inter-electrode capacity of the display electrode pair; a clamping circuit for clamping voltage of the sustain pulse on a predetermined voltage; and a sustain pulse generating circuit for alternately applying sustain pulses as many as the number corresponding to the luminance weight in the sustain period to the display electrode pairs, wherein the sustain pulse generating circuit generates at least two kinds of consecutive sustain pulses that include a first kind of sustain pulse having a first rise time and a second kind of sustain pulse having a second rise time, the first rise time being shorter than the second rise time, wherein the sustain pulse generating circuit generates the sustain pulses such that a rising period of the first kind of sustain pulse is started after a falling period of the second kind of sustain pulse is finished, and wherein the sustain pulse generating circuit generates the first kind of sustain pulse where rising period is set at 80% or higher and lower than 85% of a half a resonance cycle of the inter-electrode capacity and the inductor, and generates the second kind of sustain pulse where rising period is set at 85% or higher and 100% or lower of a half the resonance cycle, and period difference of 50 nsec or longer is provided between the rising period of the first kind of sustain pulse and the rising period of the second kind of sustain pulse.