Liquid Crystal Composition Difluoroether Monomers Environmental Trade-off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving a balance between high specific resistance, low-temperature storage stability, suitable optical anisotropy, high dielectric anisotropy, short response time, low driving voltage, and small viscosity, while also being environmentally friendly, as prior art uses environmentally unfriendly chlorine compounds and fails to optimize these properties simultaneously.
Innovation Solution
A liquid crystal composition comprising specific compounds of general formulas I, II, III, and IV, with difluoroether monomers replacing chlorine monomers, which enhances voltage holding ratio, optical anisotropy, and response time, and is environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorine compounds are used in liquid crystal composition, then voltage holding ratio and response time can be improved, but environmental friendliness deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing chlorine compounds with fluorinated cyclic compounds and specific monomer combinations. This substitution maintains the voltage holding ratio and response time performance while eliminating the environmental harm associated with chlorine compounds, thus resolving the contradiction between reliability and environmental friendliness.
Solution Approach 2:
The patent employs a composite liquid crystal composition comprising multiple components including fluorinated cyclic compounds, difluoroether monomers, and specific liquid crystal molecules in defined ratios. This composite approach achieves synergistic effects that maintain high voltage holding ratio and fast response time while using environmentally benign materials, thereby resolving the contradiction between performance and environmental friendliness.
2Reliability
If specific resistance is increased to improve voltage holding ratio, then contrast ratio improves, but manufacturing complexity increases due to property interdependence
Solution Approach 1:
The patent optimizes multiple parameters simultaneously through the selection of specific compound ratios and molecular structures. By carefully adjusting the composition parameters (types and amounts of liquid crystal molecules, monomers, and additives), the patent achieves high specific resistance and voltage holding ratio while maintaining manufacturability, thus resolving the contradiction between reliability and manufacturing complexity.
3Speed
If viscosity is reduced to shorten response time, then response time improves, but optical anisotropy may deteriorate
Solution Approach 1:
The patent achieves the optimal balance between response time and optical anisotropy by selecting specific liquid crystal molecules with appropriate molecular structures and lengths, combined with fluorinated cyclic compounds and difluoroether monomers. This parameter optimization enables fast response time through reduced viscosity while maintaining sufficient optical anisotropy for display performance, resolving the contradiction between speed and illumination intensity.
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 composition achieves high specific resistance, high voltage holding ratio, suitable optical anisotropy, small viscosity, and low threshold voltage, resulting in improved contrast ratio, power-saving performance, and extended low-temperature storage stability, making it suitable for liquid crystal display devices.
Implementation Method 1
negative dielectric anisotropy liquid crystal
Implementation Method 2
electrically controlled birefringence (ECB)
Data Source
AI summary
Provided is a liquid crystal composition, comprising: one or more compounds of general formula I accounting for 1-30% of the total weight of the liquid crystal composition; one or more compounds of general formula II accounting for 1-30% of the total weight of the liquid crystal composition; one or more compounds of general formula III accounting for 1-20% of the total weight of the liquid crystal composition; and one or more compounds of general formula IV accounting for 30-80% of the total weight of the liquid crystal composition. The liquid crystal composition has at least one of the following properties: a large specific resistance, a high voltage holding ratio, a suitable optical anisotropy, a large dielectric anisotropy, a small viscosity, a low threshold voltage, etc., and is also green and environmentally friendly. The liquid crystal composition is suitable for use in a liquid crystal display device, enabling the liquid crystal display device to have the following properties: a high voltage holding ratio, a short response time, a high contrast ratio, a low energy consumption, and being green and environmentally friendly, etc.