Liquid Crystal Composition Polymerizable Compound Solubility
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Solution Overview
Problem
Current liquid crystal compositions face challenges with poor solubility of polymerizable compounds, leading to crystallization issues and a need for improved characteristics such as high maximum temperature, low minimum temperature, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy, and stability to ultraviolet light and heat.
Innovation Solution
A liquid crystal composition containing specific compounds represented by formula (1), which includes polymerizable groups, is used to enhance solubility and achieve desired characteristics, with a balance of components to optimize performance in liquid crystal display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymerizable compounds are added to liquid crystal composition, then alignment immobilization and stability are improved, but solubility deteriorates leading to crystallization
Solution Approach 1:
The patent modifies the molecular structure of polymerizable compounds by introducing specific groups (cyano, fluoro, alkoxy) and adjusting carbon chain lengths to change solubility parameters. This allows the polymerizable compound to dissolve properly in the liquid crystal composition while maintaining its ability to form polymers for alignment immobilization.
Solution Approach 2:
The patent creates a composite liquid crystal composition containing multiple components: liquid crystal compounds, polymerizable compounds with specific structures, and additives. This composite approach allows each component to contribute its strengths - the liquid crystal provides optical properties, while the specially designed polymerizable compound provides alignment stabilization without crystallizing.
2Reliability
If polymerizable compound amount is increased to improve characteristics, then alignment control is enhanced, but solubility and stability worsen
Solution Approach 1:
The patent optimizes the concentration of polymerizable compounds within specific ranges (0.1-10 wt%) and modifies molecular parameters such as carbon chain length (C12-C22) and substituent groups to achieve maximum alignment control while maintaining solubility. The balanced composition prevents both insufficient alignment control and excessive polymerization that would cause crystallization.
3Speed
If viscosity is reduced for short response time, then response speed is improved, but temperature stability deteriorates
Solution Approach 1:
The patent uses a composite mixture of different liquid crystal compounds with complementary properties. Some components provide low viscosity for fast response, while others provide high temperature stability. The synergistic interaction between components achieves both short response time and wide temperature range operation.
Solution Approach 2:
The patent introduces compounds with specific local molecular structures (rigid core regions for stability, flexible tail regions for low viscosity) to achieve different properties in different parts of the molecule. This allows the liquid crystal composition to simultaneously exhibit fast response and temperature stability.
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 exhibits high solubility and improved performance, including a short response time, large voltage holding ratio, and long service life, suitable for active matrix devices with enhanced stability and optical properties.
Implementation Method 1
a liquid crystal composition containing a polymerizable compound that is polymerized, for example, by light or heat
Implementation Method 2
A liquid crystal composition having a negative dielectric anisotropy
Implementation Method 3
Suitable optical anisotropy
Data Source
AI summary
To provide a liquid crystal composition satisfying at least one characteristic such as a high maximum temperature of a nematic phase, a low minimum temperature thereof, a small viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and heat, or a liquid crystal composition having a suitable balance regarding at least two characteristics, and an AM device having a short response time, a large voltage holding ratio, a large contrast ratio and a long service life; a liquid crystal composition contains a specific compound having a polymerizable group as a first component, and may contain a specific compound having a large negative dielectric anisotropy and a low minimum temperature as a second component or a specific compound having a small viscosity or a large maximum temperature as a third component, and a liquid crystal display device contains the composition.