Liquid-Crystal Compound for Fast Response and Low Threshold Voltage
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Solution Overview
Problem
Current liquid-crystal display technologies face challenges in achieving high dielectric anisotropy, low rotational viscosity, and a broad operating temperature range, which are essential for improving display performance and image quality.
Innovation Solution
A liquid-crystal compound with a specific chemical structure, as defined by Formula (I) and Formula (II), is developed, which exhibits high dielectric anisotropy, low rotational viscosity, and high thermal and UV stability, thereby enhancing the characteristics of liquid-crystal compositions and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid-crystal compounds are used, then the device structure is simple, but the dielectric anisotropy is insufficient and response time is slow
Solution Approach 1:
The patent modifies the molecular structure parameters by introducing specific functional groups (cyano, fluoro, alkoxy) and adjusting the core-rigid-rod structure to optimize dielectric anisotropy and rotational viscosity, achieving faster response times while maintaining structural feasibility
Solution Approach 2:
The patent creates composite liquid-crystal compositions by combining multiple compounds with different molecular structures (Formula I and Formula II compounds mixed in specific ratios), where each component contributes different properties to achieve overall high dielectric anisotropy and low rotational viscosity
2Use of energy by moving object
If liquid-crystal composition is optimized for high dielectric anisotropy, then threshold voltage is reduced, but rotational viscosity may increase
Solution Approach 1:
The patent carefully adjusts molecular parameters including chain length, branching, and functional group positioning to achieve the optimal balance where high dielectric anisotropy (for low threshold voltage) and low rotational viscosity (for fast response) are simultaneously realized
Solution Approach 2:
The patent introduces specific local structural features (such as cyano groups at terminal positions, fluoro substitutions at aromatic rings) that locally enhance dielectric properties without significantly increasing overall molecular size and rotational viscosity
3Temperature
If liquid-crystal compound structure is simplified, then manufacturing is easier, but operating temperature range is limited
Solution Approach 1:
The patent combines multiple liquid-crystal compounds with complementary melting and clearing points to create a composition with broad operating temperature range, where the mixture exhibits liquid-crystal phase over a wider temperature span than individual components
Solution Approach 2:
The patent divides the liquid-crystal composition into multiple components with different thermal characteristics, where each component contributes to different portions of the operating temperature range, achieving overall thermal stability through composition rather than complex single-molecule structure
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 liquid-crystal compound improves display performance by reducing threshold voltage, achieving fast response times, and providing a wide operating temperature range, leading to high-quality and efficient liquid-crystal display devices.
Implementation Method 1
high dielectric anisotropy (Δε)... a liquid-crystal composition with high dielectric anisotropy facilitates the reduction of the threshold voltage (Vth)
Implementation Method 2
low rotational viscosity (γ1)... a liquid-crystal composition with a low rotational viscosity has a fast response time
Implementation Method 3
suitable birefringence
Data Source
AI summary
Liquid-crystal compounds, liquid-crystal compositions, and liquid-crystal devices employing the same are provided. The liquid-crystal compound has a structure of Formula (I):wherein R1 is hydrogen, C1-10 alkyl, or C2-10 alkenyl; R2 is, C2-10 alkenyl, or C2-10 fluoroalkenyl, in which one or two nonadjacent —CH2— is replaced by —O—, or C2-10 ether; A1, A2, A3, and A4 are independentlyR3 is independently hydrogen, or halogen; Z1, Z2, and Z3 are independently single bond, —CH2—, —(CH2)2—, —(CH2)4—, —CH2O—, —OCH2—, —CF═CF—, —(CH2)2CF2O—, —(CH2)2OCF2—, —OCF2(CH2)2—, —CF2O(CH2)2—, —COO—, —OCO—, —CF2O—, —OCF2—, —C≡C—, —CH═CH—, —CH═CH—(CH2)2—, or —(CH2)2—CH═CH—; and n and m are independently 1 or 0.