| 摘要 |
PURPOSE:To perform writing under a bright and dark conditions with a faster scanning speed which can be executed by one-frame scanning, by using alternating signals having a time width which is greater than the longer inverting time for a liquid crystal panel using a smectic liquid crystal compound, as write signals. CONSTITUTION:Since the liquid crystal molecule of a selected picture element receives the action of an electric field of a time of duration T1 which is longer than an inverting time tau1 of a pulse at the time of a voltage -V1 and shorter than another inverting time tau2 when the 1st mode signal is impressed, the picture element sufficiently inverts to a dark condition. When the 2nd mode signal is impressed, the liquid crystal molecule of the selected picture element receives an electric filed of a duration of time T2 which is longer than the inverting time tau1 of another pulse P3 at the time of a voltage -V. Therefore, the picture element once changes to a dark condition. However, since continuously impressed pulses P4 have a time width T2 which is longer then the inverting time tau2 from a dark condition to a bright condition under a voltage V1, the liquid crystal molecule is inverted from the dark condition written by the pulse P3 and writes a bright condition. Therefore, writing of the dark and bright conditions can be executed at a very high speed of hundreds microseconds mus.
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