Ferroelectric Liquid Crystal Materials with Wide Operating Range for τ-V Min Mode Devices

• Published in: Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1999-08, Vol.328 (1), p.447-456
• Main Authors: Sako, Teiyu, Furukawa, Tomoo, Kaneko, Takashi, Sakaigawa, Akira, Koden, Mitsuhiro
• Format: Article
• Language: English
• Subjects: chiral dopant method; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; ferroelectric liquid crystal display; Liquids and liquid crystals; Liquids, emulsions, and suspensions; liquid crystals; operating temperature range; operating voltage range; Physics; τ-Vmin mode
• ISSN: 1058-725X
• DOI: 10.1080/10587259908026088

We investigated τ-Vmin mode FLC materials with respect to the operating range in voltage and temperature. For wide operating voltage range, we developed smectic C host mixtures with low viscosity and high dielectric biaxiality, and added a small amount of chiral compound to them. On the other hand, for wide operating temperature range, we optimized the combination of host and chiral materials from the viewpoint of temperature dependences of dielectric anisotropy and spontaneous polarization. As a result, we developed the FLC material FDS71 showing fast response time, high contrast ratio and wide operating range in voltage and temperature. This FLC material is suitable for the multiplexed passive-matrix ferroelectric liquid crystal displays showing full color moving images due to the high bit temporal dither technique.