Liquid Crystal Composition for High Temperature and Low Viscosity
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Solution Overview
Problem
Current liquid crystal compositions for active matrix devices face challenges in achieving a high maximum temperature, low minimum temperature, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, high stability to ultraviolet light, and high stability to heat, while maintaining a balance between these characteristics.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by formulas (1) to (6), which include alkyl, alkoxy, and alkenyl groups, and ring structures like 1,4-cyclohexylene and 1,4-phenylene, optimized in weight percentages to enhance the desired properties, including the addition of optically active compounds and additives for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal compositions are used, then general characteristics can be maintained, but it is difficult to achieve a suitable balance among multiple characteristics simultaneously
Solution Approach 1:
The patent employs a composite liquid crystal composition comprising six specific compounds (Formulae 1-6) with defined weight ratio ranges. This composite approach allows simultaneous optimization of multiple characteristics: maximum temperature (achieved through compounds with high thermal stability), minimum temperature (achieved through compounds with low freezing points), viscosity (optimized through molecular structure selection), optical anisotropy (tuned through compound composition), dielectric anisotropy (controlled through molecular polarity), and stability to ultraviolet light and heat (enhanced through chemically stable compound selection). The synergistic effect of the six-component system resolves the contradiction by achieving a balanced profile across all characteristics that cannot be obtained with conventional single-phase compositions.
Solution Approach 2:
The patent systematically adjusts compositional parameters by specifying weight ratio ranges for each of the six compounds. By varying the proportions within these ranges, the composition can be tuned to achieve different balances of characteristics depending on application requirements. For example, increasing the proportion of certain compounds within the specified ranges can prioritize maximum temperature while maintaining acceptable minimum temperature, or optimize for viscosity while preserving optical anisotropy. This parameter optimization approach enables flexible adaptation to different performance priorities while maintaining overall characteristic balance.
2Temperature
If the composition is optimized for high maximum temperature, then thermal stability improves, but other characteristics such as viscosity and dielectric anisotropy may deteriorate
Solution Approach 1:
The six-component composite system resolves this contradiction by distributing functional roles across different compounds. Compounds with high thermal stability contribute to elevated maximum temperature, while other compounds in the system compensate for potential viscosity increases and maintain dielectric anisotropy. The synergistic interaction among all six compounds ensures that optimizing for maximum temperature does not sacrifice other critical characteristics, as each compound contributes differently to the overall property profile.
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 a high maximum temperature, low minimum temperature, small viscosity, and large negative dielectric anisotropy, ensuring high stability to ultraviolet light and heat, resulting in a liquid crystal display device with a short response time, large voltage holding ratio, and long service life.
Implementation Method 1
the invention relates to a liquid crystal composition having a negative dielectric anisotropy
Implementation Method 2
An optical anisotropy of the composition relates to a contrast ratio in the device
Data Source
AI summary
The liquid crystal composition having a negative dielectric anisotropy contains two ring compound having a large optical anisotropy and a negatively large dielectric anisotropy as the first component, three ring compound having a large maximum temperature and a large dielectric anisotropy as the second component, three ring compound having a large optical anisotropy and a large dielectric anisotropy as the third component, and two ring compound having a small viscosity as the fourth component. The liquid crystal display device contains the compositions.