Liquid Crystal Composition for Fast Response and Low Viscosity
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Solution Overview
Problem
Current liquid crystal display compositions face challenges in achieving high dielectric anisotropy, low viscosity, and stability across a wide temperature range, while also requiring excellent solubility at low temperatures and high voltage holding ratios, which are essential for maintaining high display quality and yield, especially in large-sized displays and those prone to defects like burn-in and dropping marks.
Innovation Solution
A liquid crystal composition is developed, comprising a dielectrically positive component with specific compounds represented by formulas (1) and (2), and a dielectrically neutral component with compounds represented by formula (40), optimized in terms of content ratios to achieve positive dielectric anisotropy, low viscosity, and high specific resistance, thereby enhancing solubility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal compounds with positive Δε and neutral Δε are combined to achieve high dielectric anisotropy, then the response speed improves, but the viscosity increases
Solution Approach 1:
The patent modifies the molecular structure parameters of liquid crystal compounds by introducing specific terminal groups (fluoro, cyano, alkoxy) and core structures (biphenyl, cyclohexane, terphenyl) to achieve optimal balance between dielectric anisotropy and viscosity. Formula (1) compounds with positive Δε ≥ 3 and formula (2) compounds with neutral Δε are combined in specific ratios to maintain high response speed while controlling viscosity
Solution Approach 2:
The patent creates a composite liquid crystal composition by combining multiple compounds with different dielectric characteristics. The mixture of positive Δε compounds (formula 1) and neutral Δε compounds (formula 2) produces a synergistic effect where the overall composition achieves high dielectric anisotropy for fast response while the neutral components help maintain acceptable viscosity levels
2Speed
If the liquid crystal composition is optimized for high dielectric anisotropy and low viscosity, then the response speed improves, but the solubility at low temperature deteriorates
Solution Approach 1:
The patent introduces specific molecular structure parameters including terminal groups (fluoro, cyano, alkoxy) and core structures that provide both fast response characteristics and low-temperature solubility. The compounds in formula (1) and (2) are designed with these dual-functional structural features to simultaneously achieve high dielectric anisotropy and maintain solubility at low temperatures
Solution Approach 2:
The patent applies different structural characteristics to different parts of the liquid crystal molecules. The core structures provide dielectric anisotropy for fast response, while the terminal groups and side chains are designed to ensure solubility at low temperatures. This local differentiation of molecular properties allows simultaneous optimization of both response speed and low-temperature stability
3Reliability
If the liquid crystal composition uses compounds with high dielectric anisotropy, then the voltage holding ratio improves, but the occurrence of display defects such as burn-in and dropping marks increases
Solution Approach 1:
The patent optimizes the dielectric anisotropy parameter to a specific range (Δε ≥ 3) that provides high voltage holding ratio while avoiding excessive values that cause display defects. The balanced composition of positive and neutral Δε compounds achieves this optimal parameter range, ensuring reliable voltage holding without generating burn-in or dropping marks
Solution Approach 2:
The patent uses compounds with neutral dielectric anisotropy (formula 2) that can compensate for the potential harmful effects of high positive Δε compounds. The neutral Δε components act as stabilizers that prevent display defects while allowing the positive Δε compounds to provide the necessary voltage holding ratio, effectively converting a potential harm into a beneficial balancing mechanism
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-speed response performance, suppresses display defects, and ensures high yield in manufacturing, with improved solubility and stability at low temperatures, maintaining excellent voltage holding ratios and reducing the occurrence of burn-in and dropping marks.
Implementation Method 1
a liquid crystal composition having positive dielectric anisotropy (Δε)... Δε to have a positive and high absolute value
Data Source
Figure 1~2
AI summary
The liquid crystal composition of the present invention can be used in a liquid crystal display element of an IPS type or a TN type in which display defects such as burn-in and dropping marks in high speed response are unlikely to be generated. Since the liquid crystal composition contains a component which is a dielectrically positive component including a dielectrically positive compound and a dielectrically neutral component of which dielectric anisotropy is greater than -2 and less than +2, the liquid crystal composition has excellent characteristics that the liquid crystal composition has a liquid crystal phase in a wide temperature range, low viscosity, excellent solubility at a low temperature, high specific resistance and a high voltage holding ratio, and is stable with respect to heat and light.