| 摘要 |
Subfields of a single frame are divided into two groups (G1,G2), and two idle periods are provided. One idle period is positioned at the end of a frame and the other is positioned between the two groups. A load ratio is calculated in correspondence with an input video signal, whereby in an Automatic Power Control method a number of sustain pulses in each subfield varies according to the load ratio, and the length of the idle time also varies wherein a reset discharge may become difficult if the idle period becomes too long. Therefore, in a reset period of a subfield of a subfield group, a gradually increasing voltage is applied to a scan electrode during a first period, the voltage increasing from a first voltage to a second voltage in correspondence with the load ratio. A third voltage is applied during a second period after the application of the gradually increasing voltage. The first period and the second period are varied depending on the load ratio. <IMAGE> <IMAGE> |
