To prevent flicker even at the time of display of a low gradation level by dividely driving on-driving pulses in such a manner that the off time of the on-driving pulse and the next on-driving pulse is made approximately the same.
Gradation data is inputted to a gradation data conversion section 4 where the data is converted to a pulse signal. This pulse signal is inputted to a driving section 2 in synchronization with the pulse generated in a lighting pulse generating section 3. The formation of the lighting display screen in a display section 3 is executed by repeating the one field time T plural times. When the on-driving pulses are subjected to divided driving in the one field time T to convert the gradation data in the gradation data conversion section 4, the conversion of the gradation data in the gradation data conversion section 4 is executed by dividing the on-driving pulses in the one field time T in such a manner that the off-time t(off) of the on driving pulse and the next on-driving pulse is made approximately the same in the field time T" to be repeated plural times with the on-driving pulse time in the one field time T set at t(on).
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SHIBATA TAKASHI
MARUTA HIDEAKI
