therefore adjusting the voltage means adjusting the voltage level to be applied finally there are three methods of adjusting the voltage a method of adjusting the voltage on the y electrode side a method of adjusting the voltage on the x electrode side and a method of adjusting both in fig4 the final voltage at which the slope shaped waveform to be applied to the x electrode arrives varies between u2212 vwx 1 and u2212 vwx 2 and that at which the slope shaped waveform to be applied to the y electrode arrives varies between vw 1 and vw 2 the voltage u2212 vwx 2 is u2212 120v which is the same as the conventional one u2212 vwx 1 is u2212 50 v and the voltage in each subfield is set to a fixed value within this range the voltage vw 2 is 200v which is the same as the conventional one vw 1 is 100 v and a fixed value is set within this range according to the condition of the subfield and the display state fig5 is a diagram that shows the structure of the drive circuit that produces the reset waveforms as mentioned above and the structure corresponds.