| 摘要 |
PROBLEM TO BE SOLVED: To control a liquid crystal to be in a OCB mode during an image display period and to improve the response speed by applying a transition voltage higher than the display voltage between first and second electrodes before the display voltage is applied so as to preliminarily cause bend transition in the liquid crystal. SOLUTION: The liquid crystal filled between first and second alignment films has both of splay alignment state and bend alignment state, and when a specified threshold voltage Vc is applied between the first and second electrodes, the energy levels of the splay alignment state and the bend alignment state are exchanged. Then a transition voltage Vt which is higher than the threshold voltage Vc is applied between the first and second electrodes to cause bend transition in the liquid crystal. Once the liquid crystal is changed into the bend state, it does not change again into the spray alignment as far as the voltage applied is decreased enough lower than the threshold voltage Vc. Thereby, in an LCD using an OCB mode, the transition voltage Vt is applied for a transition period T when the power supply is turned on, and then the display voltage in a waveform according to video signals is applied in the image display period.
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