Liquid Crystal Composition Reducing Rotational Viscosity
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Solution Overview
Problem
The response time of liquid crystal displays is limited by the high rotational viscosity of liquid crystal materials, which affects the performance of large-area, high-information-content, and color displays.
Innovation Solution
A liquid crystal composition comprising specific compounds with low rotational viscosity and high elastic constants, formulated using a combination of compounds with strong dielectric anisotropy, high optical anisotropy, and high clearing point characteristics, such as 2-methyl-3,4,5-trifluorobenzene structures and acetylenic compounds, to reduce viscosity and enhance response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal materials are used, then the display device achieves basic display function, but the response time is slow due to high rotational viscosity
Solution Approach 1:
The patent changes the chemical structure parameters of liquid crystal compounds by introducing fluorinated aromatic rings, acetylenic bonds, and specific alkyl/alkoxy chain lengths. These structural parameter changes directly reduce rotational viscosity and improve response speed while maintaining liquid crystal properties
Solution Approach 2:
The patent creates a composite liquid crystal composition by blending multiple compounds with different molecular structures (cyclic compounds, linear compounds, branched compounds) in specific ratios. This composite approach achieves synergistic effects that reduce overall rotational viscosity and improve response characteristics
2Loss of time
If liquid crystal composition is optimized for fast response, then response time decreases, but other display performance parameters may be affected
Solution Approach 1:
The patent optimizes specific local molecular structures within the liquid crystal composition - such as introducing fluorine atoms at specific positions, placing acetylenic bonds at particular locations, and designing specific alkyl chain lengths - to reduce rotational viscosity locally while maintaining overall display performance stability
Solution Approach 2:
The patent creates a dynamic balance in the liquid crystal composition by selecting compounds with appropriate clearing points, elastic constants, and viscosity characteristics that work together to achieve fast response while maintaining stable display performance across different operating conditions
Data Source
AI summary
A liquid crystal composition and use thereof in the liquid crystal display field. The liquid crystal composition includes, in percentages by weight, 5-40% of one or more compounds represented by general formula I, 2-30% of one or more compounds represented by general formula II, and 20-70% of one or more compounds represented by general formula III, and may further include 4-30% of one or more compounds represented by general formula IV and/or 5-25% of one or more compounds represented by general formulas V to IX. The combined use of the above-mentioned compounds can effectively reduce the rotational viscosity of the liquid crystal composition, improve related properties of the mixed liquid crystal, and thus reduce the response time thereof. The liquid crystal composition can be used for a fast-response liquid display in a variety of display modes.