New liquid-crystal materials for active matrix displays with negative dielectric anisotropy and low rotational viscosity

Liquid-crystal single materials with large negative dielectric anisotropies , high clearing temperatures and extremely low rotational viscosities were identified. Using these materials, the rotational viscosities for a broad r ange of mixture specifications were significantly reduced. Thus, these mixt ures are found suitable for the improvement of the switching time of liquid -crystal displays using vertical alignment (VA) modes.