| 摘要 |
PROBLEM TO BE SOLVED: To provide fast response, high contrast distorted helix ferroelectric liquid crystal devices, and to provide ferroelectric liquid crystal compositions useful therein. SOLUTION: In a distorted helix ferroelectric liquid crystal cell in which a ferromagnetic liquid crystal layer having a known thickness is disposed between electrodes at least whose one is transparent or semi-transparent, the optical anisotropy of the device is changed by applying an electric voltage to the electrodes through the later. The ferroelectric liquid crystal having the layer exhibits a ferroelectric phase, and further exhibits a chiral nematic phase at higher temperatures than temperatures exhibiting the ferroelectric phase. Since the natural helix pitch of the ferroelectric liquid crystal is sufficiently shorter than the thickness of the ferroelectric liquid crystal layer of the device in the ferroelectric phase, the ferroelectric liquid crystal has a helix-arranged vector structure and does not have a stable surface. Since the natural helix pitch of the ferroelectric liquid crystal is sufficiently longer than the thickness of the ferroelectric liquid crystal layer of the device in the nematic phase, the ferroelectric liquid crystal layer of the device is easily arranged. COPYRIGHT: (C)2006,JPO&NCIPI
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