Biaxial Liquid Crystal Composition for Fast Response LCD

The patent changes the molecular structure parameters of liquid crystals from uniaxial to biaxial configuration. Specifically, it introduces a cross-shaped molecular structure with four arms extending from a central core, where each arm contains specific functional groups (cyanobiphenyl, cyclohexane, or phenyl rings). This structural parameter change enables the liquid crystal molecules to have two different optic axes, fundamentally altering the optical properties and response characteristics of the liquid crystal material, thereby achieving faster response speed while maintaining manageable device complexity

The patent employs composite liquid crystal compositions containing multiple types of biaxial liquid crystal compounds with different molecular structures. The composition includes compounds with cyclohexane cores, phenyl cores, and naphthyl cores, each with specific substituent groups. By combining these different biaxial compounds in specific ratios, the patent achieves synergistic effects that optimize both response speed and overall device performance, resolving the contradiction between speed improvement and structural complexity

The patent systematically varies molecular parameters including the core structure (cyclohexane, phenyl, naphthyl), the number and type of substituents (CN, CF3, Cl, Br groups), and the length of alkyl chains. These parameter changes are optimized to achieve response times ≤2ms while controlling molecular complexity. The specific parameter combinations are selected to balance molecular mobility, dielectric anisotropy, and viscosity, thereby achieving fast response without excessive structural complexity

The patent introduces local functional groups at specific positions on the molecular structure to achieve desired properties. For example, cyanogen groups (—CN) are placed at terminal positions to enhance dielectric anisotropy, while fluorine atoms (—F) are positioned on phenyl rings to adjust polarity and molecular packing. This localized modification approach allows optimization of specific molecular properties without requiring complete redesign of the entire molecular structure, thus achieving fast response with controlled complexity