High speed response time of LC mixtures contained fluoro-isothiocyanato liquid crystal compounds for LCD monitor and TV applications

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 (16similar to20), high clearing temperatures (195.5 similar to 237.4degreesC), broad nematic ranges (up to 169.9degreesC) and high birefringence (0.220 similar to 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 10-30degreesC higher than their host mixture. These LC mixtures showing about 10ms of highspeed 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.