Negative Liquid Crystal Composition for Fast Response Displays
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Solution Overview
Problem
Liquid crystal materials used in displays face challenges in achieving low driving voltage, fast response, high reliability, and wide temperature stability, especially with the increasing demand for high refresh frequency and varied environmental conditions.
Innovation Solution
A negative dielectric nematic liquid crystal composition comprising specific compounds represented by Formulas I, II, III, and others, which provide low rotational viscosity, high clearing point, good solubility, and stability to heat and light, maintaining appropriate optical anisotropy for fast response and wide temperature range displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal materials have low rotational viscosity for fast response, then response time is improved, but clearing point tends to decrease
Solution Approach 1:
The patent employs composite liquid crystal compositions containing multiple compounds (cyclic carbonate compounds, cyclic carboxylate compounds, and their derivatives) to achieve both low rotational viscosity and high clearing point simultaneously, resolving the contradiction between fast response and thermal stability
Solution Approach 2:
The patent systematically varies molecular structure parameters (ring size, substituent groups, chain lengths) of the liquid crystal compounds to optimize the balance between rotational viscosity and clearing point, achieving desired performance through parameter optimization
2Speed
If liquid crystal materials have high optical anisotropy for fast response, then response speed is improved, but driving voltage increases
Solution Approach 1:
The patent adjusts dielectric anisotropy and optical anisotropy parameters through molecular structure design to achieve the optimal balance between response speed and driving voltage, ensuring fast response while maintaining energy efficiency
3Adaptability or versatility
If liquid crystal materials have wide nematic temperature range for various applications, then adaptability is improved, but response time may increase
Solution Approach 1:
The patent uses composite compositions of multiple liquid crystal compounds to simultaneously achieve wide nematic temperature range and fast response time, with each component contributing different properties that complement each other
Solution Approach 2:
The patent optimizes the properties of individual compounds within the composition to have specific characteristics (some with wide temperature range, others with fast response) that collectively achieve both goals in the final mixture
4Reliability
If liquid crystal materials have high charge retention rate for reliability, then stability is improved, but response speed may decrease
Solution Approach 1:
The patent optimizes the balance between charge retention rate and response speed by adjusting molecular structure parameters and composition ratios, achieving both high reliability and fast response through parameter optimization
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 fast response, high-frequency operation, and wide temperature stability, enhancing the performance and reliability of liquid crystal displays for various applications, including high-frequency and industrial uses.
Implementation Method 1
maintaining an appropriate optical anisotropy (Δn), and can realize a fast response of liquid crystal display
Implementation Method 2
the liquid crystal materials have appropriate negative dielectric anisotropy and elastic coefficient K
Data Source
AI summary
The present invention belongs to the technical field of liquid crystal materials, and in particular relates to a negative liquid crystal composition and a liquid crystal display element or liquid crystal display containing the liquid crystal composition. The present invention discloses a negative dielectric nematic liquid crystal composition, comprising a compound represented by Formula I, one or more compounds represented by Formula II, and one or more compounds represented by Formula III. The liquid crystal composition has a relatively low rotational viscosity (γ1), a high clearing point (Cp), a good solubility and a high stability to heat and light (VHR) on the basis of maintaining an appropriate optical anisotropy (Δn), and can be used for developing a liquid crystal display element or liquid crystal display with a low cell thickness, a wide temperature for display, and a fast response.