Liquid Crystal Composition Reducing Rotational Viscosity
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Solution Overview
Problem
Liquid crystal displays face challenges in achieving high response speed due to high rotational viscosity, which is influenced by the properties of the liquid crystal composition, such as rotational viscosity, refractive index, and elastic coefficient.
Innovation Solution
A liquid crystal composition is developed that includes specific liquid crystal compounds represented by Formulas 1-20, with varying weight percentages, which reduce rotational viscosity to less than 100 mPa·s, thereby enhancing response speed, while maintaining dielectric anisotropy and phase transition temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal compositions are used, then the liquid crystal display can maintain stable operation, but the rotational viscosity remains high resulting in slow response speed
Solution Approach 1:
The patent changes the chemical structure parameters of liquid crystal compounds by introducing specific cyclic structures (cyclohexane rings at positions 2 and 6) and fluorine substitutions. This structural parameter modification directly reduces the rotational viscosity from conventional high values to below 100 mPa·s, thereby improving response speed while maintaining other critical parameters like dielectric anisotropy and phase transition temperature within acceptable ranges.
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds with specific structural features: cyclic structures (cyclohexane rings), fluorine substitutions, and specific molecular arrangements (Formulas 1-20). This composite approach allows the mixture to achieve lower rotational viscosity than individual components while maintaining stable liquid crystal properties and broad operating temperature ranges.
2Speed
If the rotational viscosity is reduced to increase response speed, then the response speed improves, but it may affect other properties such as refractive index and phase transition temperature
Solution Approach 1:
The patent carefully adjusts chemical structure parameters including cyclic structure positions, fluorine substitution patterns, and molecular chain lengths. These parameter modifications are optimized to reduce rotational viscosity while keeping phase transition temperatures within the liquid crystal operating range (above -40°C and below 100°C) and maintaining refractive index anisotropy (Δn) between 0.05 and 0.25, thus achieving multiple property optimization simultaneously.
3Speed
If specific liquid crystal compounds with reduced rotational viscosity are used, then the response speed increases, but the device complexity increases due to multiple compound formulations
Solution Approach 1:
The patent defines a systematic parameter framework for liquid crystal compound design, including specific cyclic structures (cyclohexane at positions 2 and 6), fluorine substitution patterns, and molecular formulas (1-20). This parameter-based approach provides clear guidance for selecting and formulating compounds, simplifying the development process despite the complexity of achieving multiple property targets simultaneously.
Data Source
AI summary
A liquid crystal composition including a liquid crystal compound represented by Formula 1: