Fluorovinyl Cyclohexane Liquid Crystal for Low Viscosity
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Solution Overview
Problem
Current liquid crystal compounds fail to simultaneously exhibit a wide temperature range of the nematic phase, low viscosity, and good compatibility with other liquid crystal compounds, which are essential for high-speed response characteristics in liquid crystal display devices.
Innovation Solution
A cyclohexane compound with fluorovinyl and alkenyl groups at both ends is developed, offering a wide temperature range, low viscosity, and excellent compatibility, suitable for TN, STN, TFT, VA, IPS, and PSA modes in liquid crystal display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid crystal compound has a highly conjugated molecular structure to achieve a large refractive index anisotropy value, then the refractive index anisotropy is improved, but the compatibility with other liquid crystal compounds deteriorates
Solution Approach 1:
The patent modifies the molecular structure parameters by introducing fluorovinyl groups and controlling the degree of conjugation. The compound formula shows a balanced conjugated system with fluorovinyl substituents that reduce excessive conjugation effects while maintaining adequate refractive index anisotropy. This parameter optimization enables both large Δn values and good compatibility with other liquid crystal compounds.
2Speed
If a liquid crystal compound is designed for high-speed response characteristics, then the response speed is improved, but the temperature range of the nematic phase becomes narrow
Solution Approach 1:
The patent creates a composite molecular structure combining cyclohexane rings with fluorovinyl-substituted phenylene groups. This composite structure integrates the rigidicyclic framework that provides wide nematic temperature ranges with the fluorovinyl groups that reduce viscosity and enhance response speed. The synergistic combination of these structural elements resolves the contradiction between response speed and temperature range.
3Speed
If a liquid crystal compound has low viscosity for high-speed response, then the response speed is improved, but the stability under use conditions deteriorates
Solution Approach 1:
The patent applies local quality modification by introducing fluorovinyl groups at specific positions on the molecular structure. These localized fluorinated regions reduce overall viscosity and enhance response speed without compromising the stability of the core molecular framework. The fluorovinyl groups are strategically positioned to optimize the balance between流动性 and stability.
Data Source
AI summary
To provide a liquid crystal compound having general physical properties required for the compound, namely, a high stability to heat, light and so forth, a small viscosity, a refractive index anisotropy value having a suitable magnitude, a dielectric constant anisotropy value having a suitable magnitude and steep electro-optical characteristics, a wide temperature range of a nematic phase, and an excellent compatibility with other liquid crystal compounds, in particular, a liquid crystal compound having a wide temperature range of the nematic phase; the compound is represented by formula (1):wherein R is alkenyl having 2 to 20 carbons; ring A1 and ring A2 are independently 1,4-cyclohexylene, or 1,4-phenylene in which at least one of hydrogen may be replaced by fluorine; Z1 and Z2 are independently a single bond, —CH2CH2—, —CH═CH—, —CH2O— or —OCH2—; and n is 0 or 1.