Masahiro Terada

NOVEL FERROELECTRIC LIQUID CRYSTAL MODE FOR ACTIVE MATRIX LIQUID CRYSTAL DISPLAY USING CHOLESTERIC-CHIRAL SMECTIC C PHASE TRANSITION MATERIAL

We propose a novel ferroelectric liquid crystal (FLC) mode which is capable of gray-scale display with an active device such as a thin-film transistor (TFT). This technology is based on the monostable FLC mode, which is obtained from a material with cholesteric–chiral smectic C (Ch–SmC*) phase transition sequences and by applying a low DC voltage only near the phase transition temperature from Ch to SmC* for making the layer normal direction uniform. The electrooptical response of liquid crystal molecules under AC voltage is asymmetric between plus and minus voltages. It shows characteristics such as low spontaneous polarization (PS) value, short response time, small temperature dependence and wide tolerance to cell gap nonuniformity. Furthermore, we made TFT prototype panels using this mode. We could confirm this mode, realizing high-quality moving pictures without blurring based on the nonholding display and good color reproducibility based on the field sequential color method.

Static and dynamic properties of chevron uniform FLC

Abstract FLC materials which realize stable uniform state and small temperature dependence of response have been developed. The FLC materials have characteristics good enough to achieve large size and high contrast displays for practical use.

Digital full color ferroelectric liquid crystal display

Abstract A 15-inch diagonal size digital full color FLCD has been developed. It has 1024 × 768 pixels and each pixels is divided into 12 sub-pixels in order to realize 4,096 colors/pixel with the optical center of illumination maintained. Additionally using the so-called, dither techniques, it has demonstrated that the 16 million different hues are achievable even with the bistable FLC.