CF2O-Bonded Liquid Crystal Compound for Viscosity and Clearing Point Balance
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Solution Overview
Problem
Current liquid crystal compounds fail to achieve a balance of high stability, high clearing point, low viscosity, suitable optical anisotropy, large dielectric anisotropy, and excellent compatibility, which are necessary for improving the performance of liquid crystal display devices.
Innovation Solution
A liquid crystal compound represented by a specific formula, incorporating CF2O bonding groups and specific ring structures, is developed to enhance the physical properties such as viscosity, optical anisotropy, and dielectric anisotropy, allowing for a wide temperature range, short response time, and improved device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal compounds are used, then manufacturing and operation are simple, but they fail to achieve a balance of high stability, high clearing point, low viscosity, suitable optical anisotropy, large dielectric anisotropy, and excellent compatibility
Solution Approach 1:
The patent employs composite molecular结构设计, combining multiple ring structures (cyclohexane, benzene, pyrimidine, pyridine) with CF2O bonding groups to create a compound that achieves balanced physical properties including high stability, appropriate viscosity, and excellent compatibility, resolving the contradiction between reliability and structural complexity
Solution Approach 2:
The invention systematically adjusts molecular parameters including ring types (saturated vs. aromatic), bonding groups (CF2O, OCF2), and substituent positions to optimize the balance between clearing point, viscosity, optical anisotropy, and dielectric anisotropy, demonstrating parameter changes to achieve multiple performance targets simultaneously
2Ease of manufacture
If compound structure is simplified for ease of manufacture, then manufacturing precision and ease of manufacture improve, but physical properties such as viscosity, optical anisotropy, and dielectric anisotropy cannot be optimized
Solution Approach 1:
The patent achieves ease of manufacture by using standard synthetic chemistry approaches with readily available starting materials, while simultaneously controlling physical properties through systematic variation of molecular parameters such as ring substitution patterns and bonding group configurations
3Temperature
If compound has high clearing point for high temperature operation, then temperature range improves, but response time may increase due to higher viscosity
Solution Approach 1:
The invention optimizes the balance between clearing point and response time by adjusting molecular parameters including introducing CF2O bonding groups that enhance dielectric anisotropy and by selecting appropriate ring combinations that maintain suitable viscosity while achieving high clearing points through aromatic ring content optimization
Data Source
AI summary
A liquid crystal compound having a high stability to heat, light or the like, a high clearing point, a low minimum temperature of a liquid crystal phase, a small viscosity, a suitable optical anisotropy, a large dielectric anisotropy, a suitable elastic constant and an excellent compatibility with other liquid crystal compounds, and a liquid crystal composition including this compound, and a liquid crystal display device containing this composition. A compound represented by formula (1):for example, R1 is alkyl having 1 to 10 carbons; ring A1, ring A2 and ring A3 are 1,4-cyclohexylene, 1,4-phenylene or 1,4-phenylene in which at least one of hydrogen has been replaced by fluorine; Z1 is a single bond, and Z2 and Z3 are —CF2O— or —OCF2—; X1 is fluorine; and L1 and L2 are fluorine.