Liquid Crystal Medium for Fast Low-Temperature Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal displays face challenges with high specific resistance, temperature stability, and switching times, particularly in low-temperature environments, and require materials with high dielectric anisotropy and low threshold voltages to achieve fast switching and low rotational viscosities.
Innovation Solution
The use of liquid-crystalline media containing compounds of a specific formula, which provide high optical anisotropy, birefringence, and rotational viscosity ratios, along with a wide nematic phase range and low threshold voltage, enabling fast switching times and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional liquid crystal mixtures are used, then the display can operate at standard temperatures, but the switching times become unacceptably long at low temperatures
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the molecular structure parameters of the liquid crystal compounds (specifically compounds of formula I with particular R0, Z, A1, A2, and R substituent combinations) to achieve a balance between rotational viscosity and clearing point that enables fast switching at low temperatures while maintaining operational stability across a wide temperature range
Solution Approach 2:
The patent uses composite materials by formulating a liquid crystal mixture containing specific weight ratios of compounds of formula I (5-70%) combined with other liquid crystal compounds (formulas II-XXVII), where the composite formulation achieves synergistic effects that simultaneously improve low-temperature switching speed and overall display performance
2Reliability
If liquid crystal materials with high specific resistance are used, then the contrast and service life improve, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical structure parameters of the liquid crystal compounds (specifically the R0, Z, A1, A2, and R substituents in formula I) to inherently achieve very high specific resistance values, thereby improving contrast and service life without requiring additional manufacturing complexity or post-processing steps
3Speed
If liquid crystal materials with low rotational viscosity are used, then the switching times decrease, but the threshold voltage increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular structure parameters of compounds of formula I (including R0 groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, and their variations with Z, A1, A2, and R substituents) to achieve an optimal balance where low rotational viscosity enables fast switching while the dielectric anisotropy and molecular alignment maintain low threshold voltages
Solution Approach 2:
The patent uses composite materials by formulating mixtures where compounds of formula I (5-70% by weight) are combined with other liquid crystal compounds (formulas II-XXVII), creating a composite system where the synergistic interaction between components achieves both low rotational viscosity for fast switching and appropriate dielectric properties for low threshold voltage operation
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
These compounds enhance the performance of liquid crystal displays by achieving high specific resistance, temperature stability, and fast switching times, even at low temperatures, while maintaining low rotational viscosities and threshold voltages, thus addressing the limitations of existing materials.
Implementation Method 1
achieve high specific resistance, temperature stability, and fast switching times, even at low temperatures, while maintaining low rotational viscosities and threshold voltages
Implementation Method 2
providing high optical anisotropy, birefringence, and rotational viscosity ratios
Implementation Method 3
Materials for cells with a twisted nematic structure should have positive dielectric anisotropy and low electrical conductivity
Data Source
AI summary
The invention relates to compounds of formula I, where R0, A0, A1, A2, Z0, Z1, A2, L1, L2, X, I, m and m have the meanings specified in claim 1, and to use thereof in liquid crystal media, and to liquid crystal media containing one or more compounds of formula I in electro-optical liquid crystal displays.