Liquid Crystal Composition for Active Matrix Displays
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Solution Overview
Problem
Current liquid crystal compositions for active matrix devices lack a balance of high maximum and low minimum temperature ranges, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, high stability to ultraviolet light and heat, and long service life.
Innovation Solution
A liquid crystal composition comprising specific compounds represented by formulas (1), (2), and (3), optimized for use in active matrix devices with operating modes like VA, IPS, or PSA, to achieve the desired balance of characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a liquid crystal composition is designed to have a high maximum temperature of the nematic phase, then the usable temperature range is extended, but the viscosity tends to increase and response time deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully selecting and combining multiple liquid crystal compounds with different molecular structures and physical properties. The composition includes compounds with specific ratios that allow the mixture to achieve a high maximum temperature while maintaining acceptable viscosity through the synergistic effects of the different components
Solution Approach 2:
The patent uses a composite liquid crystal composition consisting of multiple different liquid crystal compounds mixed in specific proportions. This composite approach allows the composition to achieve properties that individual compounds cannot provide alone, specifically extending the temperature range while controlling viscosity through the combined characteristics of the mixture
2Speed
If the viscosity of the liquid crystal composition is reduced to achieve short response time, then the response time is improved, but the voltage holding ratio may deteriorate
Solution Approach 1:
The patent optimizes the physical parameters of the liquid crystal composition by selecting compounds with specific viscosity and dielectric properties. The composition achieves a balance where the viscosity is low enough for fast response but the specific resistance and dielectric anisotropy are sufficient to maintain a high voltage holding ratio
Solution Approach 2:
The patent applies local quality by having different compounds in the mixture serve different functions: some compounds primarily contribute to low viscosity for fast response, while others contribute to high specific resistance for voltage holding, creating a composition with optimized local properties for each requirement
3Use of energy by moving object
If the dielectric anisotropy is increased to reduce threshold voltage and power consumption, then the optical control efficiency is improved, but the stability to ultraviolet light and heat may deteriorate
Solution Approach 1:
The patent optimizes the dielectric anisotropy parameter by selecting liquid crystal compounds with specific molecular structures that provide high dielectric anisotropy. The composition achieves low threshold voltage and power consumption while incorporating compounds with high stability to ultraviolet light and heat, balancing electrical performance with environmental stability
Solution Approach 2:
The patent uses a composite composition where different compounds contribute different properties: some compounds provide high dielectric anisotropy for low power consumption, while others provide high stability to ultraviolet light and heat. The synergistic combination allows the composition to achieve both low power consumption and high stability simultaneously
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 provides a liquid crystal display device with improved temperature stability, reduced viscosity, enhanced optical and dielectric anisotropy, and extended service life, enabling faster response times and higher voltage holding ratios.
Implementation Method 1
a liquid crystal composition having a negative dielectric anisotropy
Implementation Method 2
A liquid crystal composition having a suitable optical anisotropy
Data Source
AI summary
The invention is to provide a liquid crystal composition satisfying at least one of characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and a high stability to heat, or having a suitable balance regarding at least two of the characteristics; and is to provide an AM device having a short response time, a large voltage holding ratio, a large contrast ratio, a long service life and so forth; wherein the liquid crystal composition includes a specific compound having a large negative dielectric anisotropy and a low minimum temperature as a first component, a specific compound having a small viscosity or a large maximum temperature as a second component and a specific compound having a polymerizable group as a third component, and a liquid crystal display device contains the composition.