Abstract
Thresholdless antiferroelectric liquid crystal (TLAF) characterized by V-shaped switching in a smectic liquid crystal is very attractive for active matrix driving, but the switching mechanism is not fully understood. We have studied electro-optical properties of the TLAF material MLC-0071, and developed a 15-inch TFT-LCD with XGA resolution using the material. Temperature-dependence of relative permittivity suggested the presence of a Goldstone mode. This result implies the V-shaped switching of MLC-0071 is based on a smectic C*-like phase. From the measurements of optical anisotropy etc., it was found that the TLAF had a chevron structure and the molecules oriented parallel to the substrate plane when gray-level voltage was applied. The 15-inch TLAF-TFT-LCD provided wide viewing angle, high contrast ratio and small color shift.
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