Liquid Crystal Composition for Fast Response and Low Viscosity
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Solution Overview
Problem
Current liquid crystal displays face challenges in achieving optimal dielectric anisotropy, rotation viscosity, and response speed due to limitations in the properties of existing liquid crystal compounds used in their compositions.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by Chemical Formulas 1 and 2, which provide a dielectric anisotropy of -4 to -5 and a rotation viscosity of 150 or less, along with a phase transition temperature of 95° C. to 105° C., is developed, including a detailed molecular structure and substituents that enhance the compound's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing liquid crystal compounds are used, then the display can operate, but the rotation viscosity is high and response speed is slow
Solution Approach 1:
The patent modifies molecular parameters of liquid crystal compounds by introducing specific chemical groups (cyclohexane, cyclohexene, benzene rings with fluorine and alkyl substitutions) to achieve target dielectric anisotropy (Δε: -4 to -5) and rotation viscosity (γ1: ≤150), directly resolving the contradiction between response speed and rotation viscosity
Solution Approach 2:
The patent creates a composite liquid crystal composition containing multiple compounds with specific molecular structures (Chemical Formulas 1-19), where each compound contributes different properties to achieve balanced dielectric anisotropy and rotation viscosity, enabling both fast response and low viscosity
2Speed
If liquid crystal compounds with high dielectric anisotropy are used, then response speed improves, but achieving optimal rotation viscosity becomes difficult
Solution Approach 1:
The patent precisely controls molecular parameters including phase transition temperature (Tni: 95-105°C), dielectric anisotropy (Δε: -4 to -5), and rotation viscosity (γ1: ≤150) through systematic molecular design, achieving multiple property targets simultaneously with high precision
Solution Approach 2:
The patent formulates a multi-component liquid crystal composition where compounds with Chemical Formulas 1-19 work synergistically to achieve balanced physical properties, making it easier to control dielectric anisotropy and rotation viscosity within target ranges
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 improved rotation viscosity and response speed, maintaining desired physical properties for liquid crystal displays, such as low rotation viscosity and high dielectric anisotropy, thereby enhancing the display's performance and efficiency.
Implementation Method 1
a voltage may be applied to the field generating electrodes so as to form an electric field in the liquid crystal layer, the alignment of liquid crystal molecules of the liquid crystal layer may be determined by the electric field
Implementation Method 2
the alignment of liquid crystal molecules of the liquid crystal layer may be determined by the electric field, and the polarization of incident light may be controlled
Data Source
AI summary
A liquid crystal composition and a liquid crystal display, the composition including a liquid crystal compound represented by Chemical Formula 1 below: