Naphthalene-Based Liquid Crystal Composition for Fast Response
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Solution Overview
Problem
Existing polymerizable compound-containing liquid crystal compositions for PSA type liquid crystal display devices face challenges in achieving a balance between high-speed responsiveness, high contrast, and minimizing display unevenness and image persistence, particularly due to limitations in adjusting polymerization reaction rates and residual polymerizable compound amounts.
Innovation Solution
A polymerizable compound-containing liquid crystal composition is developed, incorporating specific polymerizable compounds with naphthalene units, which enables fast polymerization, low viscosity, and minimal residual polymerizable compound, thereby enhancing response speed, suppressing display defects, and reducing energy costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a liquid crystal compound having a terphenyl ring is used to reduce polymerization reaction rate, then the polymerization reaction rate is reduced, but display unevenness and image persistence occur due to decreased VHR
Solution Approach 1:
The patent changes the chemical structure parameters of the liquid crystal compound by introducing specific substituents (fluorine atoms at positions 2 and 6 of the naphthalene ring, and氰基 groups at positions 3 and 7 of the phenyl ring) to achieve the desired balance between polymerization rate and display quality without using terphenyl ring structures
Solution Approach 2:
The patent creates a composite liquid crystal composition containing multiple components: the specifically structured naphthalene-based liquid crystal compound (Formula 1), polymerizable compounds (Formula 2), and other liquid crystal compounds (Formula 3), where each component contributes different properties to achieve overall performance optimization
2Productivity
If the polymerization reaction rate is adjusted for UV irradiation lamp specifications, then the polymerization reaction rate is optimized, but it is difficult to simultaneously achieve high-speed responsiveness, high contrast, and suppressed display defects
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the molecular structure of the liquid crystal compound (Formula 1), the polymerizable compound structure (Formula 2), their concentration ratios, and the UV irradiation conditions to achieve fast response speed, high contrast, and complete polymerization without residual monomers
Solution Approach 2:
The patent replaces the mechanical approach of simply adjusting irradiation intensity with a chemical approach using specifically designed molecular structures that have optimized UV absorption characteristics and polymerization kinetics, allowing for more precise control of the polymerization process
3Speed
If viscosity and rotational viscosity are reduced for fast response speed, then response speed is improved, but the polymerization reaction rate and residual polymerizable compound amount become difficult to control
Solution Approach 1:
The patent changes the molecular structure parameters of both the liquid crystal compound and polymerizable compound to achieve low viscosity while maintaining optimal polymerization characteristics, including UV absorption efficiency and reaction kinetics
Solution Approach 2:
The patent uses a composite system where the low-viscosity liquid crystal compound (Formula 1) and polymerizable compound (Formula 2) work together in specific ratios, allowing the mixture to have both fast response characteristics and controllable polymerization behavior that cannot be achieved with single components
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 fast response speeds, suppresses display unevenness and image persistence, and improves production efficiency with uniform and stable orientation control, making it suitable for high-performance liquid crystal display devices.
Implementation Method 1
it is manufactured by polymerizing the polymerizable compound in a state where liquid crystal molecules are aligned by applying a voltage so as to fix the alignment of the liquid crystal molecules
Data Source
AI summary
There is provided a liquid crystal display device of a PSA type or the like that uses the polymerizable compound-containing liquid crystal composition, having a sufficiently fast response speed, capable of 3D displaying. Uniform and stable orientation control can be obtained at a lower energy cost. Provided are the polymerizable compound-containing liquid crystal composition containing one or two or more polymerizable compounds represented by general formula (M) as the first component, and containing one or two or more compounds represented by general formula (Na), general formula (Nb), or general formula (Nc) having a naphthalene unit as the second component. The liquid crystal display device uses the same.