Method and apparatus for driving display apparatus

An apparatus for driving a display device including a display element constituted by interposing a dielectric layer between a plurality of scanning electrodes and a plurality of data electrodes, the drive apparatus comprising:

• a scanning electrodes drive circuit for applying writing voltages of alternately varying polarity to consecutive ones of the plurality of scanning electrodes in each predetermined scanning period;
• and
• a data electrodes drive circuit for generating only one pulse of modulation voltage during two successive scanning periods, said pulse having a pulse width encompassing a portion of said two successive scanning periods, said pulse of modulation voltage including an adjustable pulse duration rise time and an adjustable pulse duration fall time, each separately adjustable to separately vary an amount of said pulse width in each of said two successive scanning periods, respectively.

A method for driving a display apparatus including a dielectric layer interposed between a plurality of scanning electrodes and a plurality of data electrodes, the method comprising the steps of:

• (a) applying a writing voltage of alternating positive and negative polarity to each of the plurality of scanning electrodes in sequence, in each of a plurality of sequential driving periods;
• (b) generating only one pulse of modulation voltage during a plurality of consecutive scanning periods, said pulse having a pulse width encompassing said plurality of consecutive scanning periods, said pulse of modulation voltage including an adjustable rise time and an adjustable fall time, said rise time and fall time being separately adjustable to separately vary an amount of said pulse width within each scanning period of said plurality of consecutive scanning periods corresponding to gradation data to be displayed.

A method of driving a display device including a plurality of scanning electrodes and a plurality of data electrodes arranged in mutually intersecting directions, said method comprising the steps of:

• applying a writing voltage consecutively of alternately varying polarity to adjecent ones of said plurality of scanning electrodes in each of a plurality of predetermined scanning periods, respectively,
• applying a modulation voltage to one of said plurality of data electrodes for said plurality of predetermined scanning periods, said modulation voltage having two states;
• changing the state of said modulation voltage only once during each scanning period for said plurality of predetermined scanning periods, the time in which the state of said modulation voltage is changed in each scanning period being adjustable in accordance with the desired level of gradation to be displayed.