| 摘要 |
PURPOSE:To prevent ferroelectric liquid crystal from deteriorating by applying a DC component which is equal to but opposite in polarity in a short-time pulse voltage to the ferroelectric liquid crystal continuously together with the short-time pulse voltage. CONSTITUTION:Pulses which have a voltage lower than a threshold voltage EC are assigned in front of and behind a pulse voltage which drives the ferroelectric liquid crystal actually to obtain opposite-polarity charges which are equal to the DC component of a pulse voltage to be applied as a driving voltage signal which cancel a one-way DC component, and the signal which is much short in time than said voltage signal is used as units. There are two opposite-polarity ON and OFF units. Consequently, the driving voltage signal which reduces the mean value of the amount of charges applied to the ferroelectric liquid crystal within a specific period to zero is obtained and the liquid crystal element never deteriorates owing to the electrochemical reaction of the DC component.
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