Nematic Liquid Crystal Composition for Low Viscosity and High Speed

The patent employs a composite liquid crystal composition comprising multiple components: a first liquid crystal compound (cyclic carbonate derivative), a second liquid crystal compound (fluorinated cyclic carbonate derivative), and a third liquid crystal compound (aromatic compound with specific molecular structure). This composite approach allows optimization of overall composition properties to achieve both low viscosity and positive dielectric anisotropy, resolving the contradiction between versatility and viscosity.

The patent systematically adjusts molecular structure parameters of the liquid crystal compounds, specifically incorporating fluorine atoms at predetermined positions in the cyclic carbonate rings and optimizing the aromatic substituent patterns. These parameter changes enable reduction of intermolecular forces and viscosity while maintaining the positive dielectric anisotropy required for horizontal-alignment display modes.

The patent optimizes the balance between dielectric anisotropy and rotational viscosity by carefully selecting the molecular structures of the three liquid crystal compounds. The fluorinated cyclic carbonate derivatives provide high dielectric anisotropy for low-voltage operation, while the specific aromatic compounds contribute to maintaining appropriate rotational viscosity for fast response, achieving both low drive voltage and high response speed simultaneously.

The patent introduces fluorine atoms at specific local positions (predetermined positions) in the molecular structures of the cyclic carbonate derivatives. This localized modification enhances dielectric anisotropy in specific molecular regions without significantly increasing overall molecular size or rotational viscosity, enabling low-voltage drive while preserving response speed.

The patent uses a composite composition of three different liquid crystal compounds with complementary properties. The cyclic carbonate derivatives provide low rotational viscosity for fast response, while the aromatic compounds with specific substituent patterns contribute to stabilizing the nematic phase across a wide temperature range. This composite approach balances response speed and thermal stability.

The patent merges the functional advantages of different liquid crystal compound classes: the fluorinated cyclic carbonate derivatives contribute low viscosity and high dielectric anisotropy, while the aromatic compounds provide thermal stability and wide operating temperature range. By combining these components in specific ratios, the composition achieves both high-speed response and broad temperature operation.