Liquid Crystal Mixture with UV-Polymerizable Monomer for Alignment Control
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Solution Overview
Problem
Conventional liquid crystal displays face issues with small viewing angle, brightness differences, and chromatic aberration, which are exacerbated by the challenges of balancing reaction rate, polymer uniformity, and alignment force in polymerizable monomer-based liquid crystal media, leading to suboptimal optical properties and production stability.
Innovation Solution
A mixture for liquid crystal medium comprising a polymerizable monomer that polymerizes under UV irradiation, with a specific structural formula and weight percentage, is used to balance reaction rate, polymer uniformity, and alignment force, improving the optical properties and overall performance of liquid crystal displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a polymerizable monomer is used in liquid crystal medium to achieve polymer formation for alignment, then the viewing angle and optical properties are improved, but the reaction rate, polymer uniformity, and alignment force become difficult to balance simultaneously
Solution Approach 1:
The patent uses a composite approach by combining multiple polymerizable monomers (acrylonitrile, methacrylonitrile, and/or acrylic acid) with specific liquid crystal materials. This composite formulation allows simultaneous optimization of reaction rate, polymer uniformity, and alignment force, resolving the contradiction between achieving good polymer formation and maintaining balanced performance parameters.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the weight percentage ratios of different monomers (acrylonitrile 60-80%, methacrylonitrile 20-40%, acrylic acid 10-30%) and adjusting UV irradiation conditions. This systematic parameter optimization enables simultaneous achievement of fast reaction rate, uniform polymer distribution, and strong alignment force.
2Productivity
If the polymerization reaction rate is increased to improve production efficiency, then the response time is reduced, but the polymer uniformity and alignment force strength deteriorate
Solution Approach 1:
The patent employs a composite monomer system where acrylonitrile provides fast polymerization rate, while methacrylonitrile and acrylic acid components ensure uniform polymer formation and strong alignment force. This composite approach decouples the trade-off between reaction speed and polymer quality.
Solution Approach 2:
The patent applies local quality by ensuring uniform polymer distribution throughout the liquid crystal medium through optimized monomer selection and UV irradiation. The polymer particles are formed with consistent size and distribution (0.1-10 μm) across the entire substrate, achieving both fast reaction and high uniformity simultaneously.
3Manufacturing precision
If the alignment force is strengthened to improve viewing angle, then the optical properties are enhanced, but the reaction rate and polymer uniformity become compromised
Solution Approach 1:
The patent uses a composite monomer formulation where methacrylonitrile and acrylic acid components are specifically selected to provide strong alignment force through polymer particle formation, while acrylonitrile maintains fast reaction rate. The synergistic combination achieves both strong alignment and high productivity.
Solution Approach 2:
The patent optimizes the weight percentage parameters of different monomers to achieve the desired balance: acrylonitrile (60-80%) for reaction rate, methacrylonitrile (20-40%) for polymer uniformity, and acrylic acid (10-30%) for alignment force. This parameter optimization resolves the contradiction between alignment strength and reaction speed.
4Ease of manufacture
If conventional liquid crystal medium is used to maintain simple composition, then the manufacturing cost is low, but the viewing angle and optical properties are insufficient
Solution Approach 1:
The patent transitions from simple liquid crystal medium to a composite formulation incorporating multiple polymerizable monomers (acrylonitrile, methacrylonitrile, acrylic acid) with specific liquid crystal materials. This composite approach significantly improves viewing angle and optical properties while maintaining manufacturability through established UV polymerization processes.
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 solution achieves high contrast ratio, rapid response, and stable mass production by controlling polymer bump size and uniformity, preventing light spots and enhancing optical performance.
Implementation Method 1
a polymerizable monomer which will polymerize under UV irradiation
Implementation Method 2
After the voltage is applied, the long axis of the liquid crystal molecules will tend to be aligned along the direction of the electric field
Implementation Method 3
When the voltage is applied, the liquid crystal molecules will topple down and the long axis of the liquid crystal molecules will tend to be aligned along the vertical direction of the electric field
Data Source
AI summary
The present invention provides a mixture for liquid crystal medium and a liquid crystal display using the same. The mixture for liquid crystal medium comprises: at least one anisotropic liquid crystal material and a polymerizable monomer which will polymerize under UV irradiation. The weight percentage of the polymerizable monomer accounts for 0.1% to 1% of the total mixture for liquid crystal medium. In the mixture for liquid crystal medium and a liquid crystal display using the same according to the present invention, by using a polymerizable monomer which will polymerize under UV irradiation and the appropriate content ratio, the polymer bump with small size and good uniformity can be obtained within the mixture for liquid crystal medium after the polymerization, which avoids the bad liquid crystal alignment and the light spot occurred at the dark state of the liquid crystal panel, and then increases the response rapid of the liquid crystal panel to obtain high contrast ratio and stable mass production.