Liquid Crystal Compound with Fluorine Substitutions for Display Anisotropy
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Solution Overview
Problem
Current liquid crystal display elements face challenges in achieving high clearing point, large dielectric and optical anisotropy, low driving voltage, and good low-temperature stability while maintaining compatibility with other compounds.
Innovation Solution
A compound with the structure of general formula I, which includes specific alkyl or alkenyl groups and fluorine substitutions, is used to create a liquid crystal composition that enhances dielectric and optical anisotropy, stability, and response time, suitable for various liquid crystal display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid crystal compound is designed to have high clearing point and large dielectric/optical anisotropy, then the display performance and temperature range are improved, but the molecular structure complexity increases and compatibility with other compounds becomes difficult to maintain
Solution Approach 1:
The patent systematically varies molecular parameters including alkyl chain lengths (C1-C18), alkenyl chain lengths (C2-C18), fluorine substitution positions, and linkage types to optimize the balance between clearing point, dielectric anisotropy, optical anisotropy, and compatibility. This parameter optimization approach allows achieving high display performance while maintaining reasonable molecular structure
Solution Approach 2:
The patent designs compounds with composite molecular structures combining rigid aromatic rings (phenylene, pyridylene, pyrimidinylene groups) with flexible alkyl/alkenyl chains and fluorine substitutions. This composite structure approach enables simultaneous achievement of high clearing point (from rigid groups), large anisotropy (from fluorine substitutions), and good compatibility (from flexible chains)
2Use of energy by moving object
If the liquid crystal composition uses compounds with large dielectric anisotropy to reduce driving voltage, then the power consumption is reduced, but the chemical stability and physical stability may be compromised
Solution Approach 1:
The patent optimizes molecular parameters such as fluorine substitution positions on aromatic rings, alkyl chain lengths, and linkage types to achieve large dielectric anisotropy while maintaining chemical stability. Specific parameters like fluorine at positions 2,4,5 on phenylene rings and C1-C7 alkyl chains are selected to balance dielectric properties with stability
Solution Approach 2:
The patent employs fluorine atoms (small, electronegative) as substitution groups that provide large dielectric anisotropy with minimal impact on molecular stability. These fluorine substitutions act as efficient, stable modifiers that enhance dielectric properties without compromising the overall molecular structure stability
3Speed
If the liquid crystal compound has fast response time, then the display refresh rate is improved, but the viscosity may increase and compatibility with other compounds decreases
Solution Approach 1:
The patent optimizes molecular parameters including alkyl chain lengths (shorter chains reduce viscosity), linkage types (rigid linkages improve response time), and aromatic ring structures to achieve fast response time while controlling viscosity. Parameters such as C1-C7 alkyl chains and rigid aromatic linkages are selected to balance response speed with viscosity and compatibility
Solution Approach 2:
The patent introduces rigid aromatic groups (phenylene, pyridylene, pyrimidinylene) at specific positions in the molecular structure to enhance response time locally, while maintaining flexible alkyl chains in other regions to control overall viscosity and ensure compatibility with other liquid crystal compounds
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compound provides a liquid crystal composition with high clearing point, large dielectric and optical anisotropy, fast response, and good low-temperature stability, particularly suitable for IPS-type and TN-TFT-type liquid crystal display devices.
Implementation Method 1
These liquid crystal display elements take advantage of optical anisotropy, dielectric anisotropy, and the like of a liquid crystal compound
Implementation Method 2
These liquid crystal display elements take advantage of optical anisotropy, dielectric anisotropy, and the like of a liquid crystal compound
Data Source
AI summary
A compound having the structure of general formula I is useful as a liquid crystal composition and as a photoelectric display device including the liquid crystal composition. The compound having the structure of general formula I is chemically and physically stable, and has higher clearing point, and both large dielectric anisotropy and large optical anisotropy at the same time. The compound having the structure of general formula I is well compatible with other liquid crystal compounds when applied in a liquid crystal composition, the composition has good stability especially in a low-temperature environment, the characteristic of fast response and a wide range of applicabilities, especially applicable to the IPS-type and TN-TFT-type liquid crystal display devices.