Liquid Crystal Composition for Low Voltage Display Performance
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Solution Overview
Problem
Existing liquid crystal materials face challenges with lower resistivity, excessive operating voltage, and poor low-temperature storage stability, limiting their application in harsh environments and requiring improvements in optical anisotropy, dielectric anisotropy, and temperature range.
Innovation Solution
A liquid crystal composition comprising specific compounds of general formulas I, II, III, IV, and V, with defined weight percentages, which enhance optical anisotropy, dielectric anisotropy, and low-temperature stability, while reducing threshold voltage and maintaining reliability and heat stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal materials are designed to have high optical anisotropy and dielectric anisotropy, then display performance is improved, but threshold voltage increases and operating voltage becomes excessive
Solution Approach 1:
The patent applies parameter changes by carefully adjusting the molecular structure parameters of liquid crystal compounds, specifically modifying the core structure, terminal groups, and substituent positions to achieve optimal balance between optical anisotropy (Δn≥0.11), dielectric anisotropy (Δε≥10), and threshold voltage (≤3.5V). The systematic variation of molecular parameters allows simultaneous satisfaction of multiple performance requirements.
Solution Approach 2:
The patent employs composite materials by formulating liquid crystal compositions containing 3-10 different compounds in specific weight ratios (5-40% each), where each compound contributes different properties. This composite approach allows the mixture to achieve high optical anisotropy and dielectric anisotropy while maintaining low threshold voltage through synergistic effects of multiple components.
2Adaptability or versatility
If liquid crystal materials are designed for wide temperature range operation, then adaptability to harsh environments is improved, but low-temperature storage stability deteriorates
Solution Approach 1:
The patent applies local quality by introducing specific functional groups and substituent patterns at different positions of the molecular structure. The terminal groups (R1-R6) and substituent groups (Y1-Y12, X1-X3) are locally optimized to provide cold-flow properties and low-temperature flexibility, while the core structure maintains thermal stability. This local structural optimization enables wide nematic phase range (−20°C to 70°C) without sacrificing storage stability.
Solution Approach 2:
The patent uses parameter changes by adjusting molecular weight, chain length, and substituent types to achieve optimal low-temperature performance. Specific compounds with molecular weights and structures within defined ranges are selected to ensure the liquid crystal composition remains stable and intersoluble at low temperatures (−25°C to −30°C storage for ≥1000 hours) while maintaining wide operating temperature range.
3Reliability
If liquid crystal materials use multiple compounds to achieve desired properties, then performance requirements are met, but miscibility and low-temperature intersolubility become problematic
Solution Approach 1:
The patent applies homogeneity by designing liquid crystal compounds with similar molecular structures and compatible functional groups that ensure good miscibility. All compounds share common structural features (core structures, terminal groups, and substituent patterns) that promote uniform mixing and prevent phase separation. This structural homogeneity among diverse compounds ensures complete miscibility and maintains composition stability across wide temperature ranges.
Solution Approach 2:
The patent uses composite materials by formulating a multi-component system where 3-10 different compounds are combined in specific weight ratios (5-40% each). The composite formulation is designed so that each component complements the others, with structural similarities ensuring miscibility while functional diversity meeting performance requirements. The synergistic composite achieves both high performance and composition stability.
4Speed
If liquid crystal materials are optimized for high dielectric anisotropy, then response speed is improved, but resistivity decreases and reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dielectric anisotropy parameter (Δε) within the range of 10-15 through molecular structure optimization. By adjusting the terminal groups (R1-R6), substituent groups (Y1-Y12, X1-X3), and core structures, the patent achieves optimal dielectric anisotropy that enables fast response speed (γ1≤900 mPa·s) while maintaining sufficient resistivity (≥1×10^9 Ω·cm) for reliable operation. The parameter optimization ensures neither extreme is reached, balancing speed and reliability.
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 optical anisotropy, lower threshold voltage, suitable temperature range, and improved reliability and heat stability, enabling effective performance in harsh environments with low driving voltage and good low-temperature storage performance.
Implementation Method 1
Because of its characteristics of optical anisotropy and dielectric anisotropy, liquid crystal material is widely used in the liquid crystal display elements
Implementation Method 2
Because of its characteristics of optical anisotropy and dielectric anisotropy, liquid crystal material is widely used in the liquid crystal display elements
Data Source
AI summary
A liquid crystal composition and the use thereof are provided. The liquid crystal composition comprises 15-30% by weight of three or more compounds of general formula I; the general formula I must comprises at least two compounds of general formula I-1; wherein, by weight of the total amount of the liquid crystal composition, the total amount of the compounds of general formula I-1 is no lower than 10%, and the content of each of the compounds of general formula I-1 is no higher than 8%. The liquid crystal composition has appropriately high optical anisotropy, higher dielectric anisotropy, lower threshold voltage, suitable elastic constant, suitable temperature range of nematic phase, good reliability and heat stability, and good low-temperature intersolubility.