Liquid Crystal Composition for Fast Response and High Voltage Holding

The patent employs a composite liquid crystal composition containing multiple specific compounds (cyclohexane carboxylic acid derivatives, phenyl cyclohexane derivatives, etc.) in defined weight ratios. This composite approach allows the composition to achieve both a wide nematic phase temperature range (-10°C to 70°C) and stable physical properties including controlled viscosity, thereby resolving the contradiction between temperature range and temperature stability.

The patent precisely controls the molecular structure parameters of the liquid crystal compounds, including the ratio of cyclic to non-cyclic structures (0.3-0.7), and the specific substitution patterns on phenyl and cyclohexane rings. By adjusting these molecular parameters, the composition achieves optimal balance between wide temperature range and stable viscosity characteristics.

The patent uses a composite composition of multiple liquid crystal compounds with different molecular characteristics. The specific combination of cyclohexane carboxylic acid derivatives, phenyl cyclohexane derivatives, and other compounds in defined ratios (each 5-50 wt%) creates a synergistic effect that achieves low viscosity for fast response while maintaining high voltage holding ratio through complementary molecular interactions.

The patent introduces compounds with specific local molecular structures, such as fluorine substitutions at specific positions (R1-R6 groups) and specific ring structures (cyclohexane vs. phenyl), to locally optimize properties. The fluorine substitutions and specific ring structures contribute to low viscosity and fast response, while the overall molecular architecture maintains high dielectric anisotropy for good voltage holding.

The patent employs a composite composition where compounds with high optical anisotropy (due to rigid cyclic structures and aromatic rings) are combined with compounds that maintain high dielectric anisotropy (through fluorine substitutions and specific molecular geometries). The synergistic combination in defined weight ratios achieves both large optical anisotropy for high contrast ratio and sufficient dielectric anisotropy for low threshold voltage.

The patent controls the molecular structure parameters including the ratio of cyclic to non-cyclic structures (0.3-0.7), the specific substitution patterns (fluorine at R1-R6 positions), and the overall molecular geometry. These parameter adjustments optimize the balance between optical anisotropy (for contrast ratio) and dielectric anisotropy (for threshold voltage).

The patent selects polymerizable compounds that serve multiple functions: they provide polymer sustained alignment to prevent image burn-in, contribute to the overall liquid crystal properties (viscosity, anisotropy), and maintain compatibility with the other composition components. This multi-functionality reduces the need for separate additives, thereby limiting the increase in composition complexity while achieving alignment stability.

The patent precisely controls the concentration of the polymerizable compound within a specific range (0.01-5 wt%) to achieve optimal polymer sustained alignment effect without excessive complexity. The molecular structure of the polymerizable compound is also optimized (specific vinyl group structures) to ensure it integrates well with the liquid crystal composition while providing the desired alignment properties.