High-Speed Response Time of LC Mixtures Contained Fluoro-isothiocyanato Liquid Crystal Compounds for LCD Monitor and TV Applications

摘要

A most important parameter for TV application of LCD is a fast switching time for displaying of moving image. To achieve the requirement of faster switching times, the novel LC single materials with large dielectric anisotropies (16 ～ 20), high clearing temperatures (195.5 ～ 237.4 °C), broad nematic ranges (up to 160.9 °C) and high birefringence (0.220 ～ 0.254) were developed. KUR-series LC mixtures blended these single materials have significantly higher clearing temperatures and dielectric anisotropy values compared with conventional LC mixture. Especially, clearing temperatures of them are 10 ～ 30 °C higher than their host mixture. These LC mixtures showing about 10ms of high-speed response time in TV/Monitor of TFT LCD, which are shorter enough to be addressed in one frame time of 60Hz (16.7ms). The threshold voltage V_(th) was low enough to operate at a driving voltage of 5V. The VHR values were found to high enough for TFT-LCD in wide temperature range. Our novel LC mixtures are suitable materials for inclusion in LC mixtures for TV application of TN-LCD.