Polymerizable Liquid Crystal Compound for Optical Film Coating
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Solution Overview
Problem
Current liquid crystal compounds used in optical films for display devices face challenges with solubility in organic solvents, miscibility, and maintaining a wide nematic phase region, which affects their coating properties and stability, limiting their performance in enhancing viewing angles and optical compensation.
Innovation Solution
A polymerizable liquid crystal compound with specific chemical structures, such as those represented by Chemical Formulas 1 and 2, is developed, offering improved solubility, miscibility, and stability, along with polymerizable functional groups for enhanced film workability and optical anisotropy, allowing for both forward and reverse wavelength dispersion retardation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal compounds are used in optical films, then the films can provide optical compensation, but the compounds exhibit poor solubility in organic solvents and poor miscibility, which deteriorates coating properties
Solution Approach 1:
The patent modifies the molecular structure of liquid crystal compounds by introducing specific functional groups (carboxyl, hydroxyl, amino groups) and adjusting the ratio of rigid to flexible groups. This changes the chemical parameters of the compounds to improve solubility in organic solvents while maintaining liquid crystallinity and optical compensation performance
Solution Approach 2:
The patent creates composite liquid crystal compositions by combining multiple liquid crystal compounds with different molecular structures and properties. This allows the mixture to achieve both good solubility/coating properties and stable liquid crystalline phase for optical compensation
2Adaptability or versatility
If liquid crystal compounds with wide nematic phase region are used, then viewing angle enhancement is improved, but the compounds require excellent structural stability and low melting point, which creates formulation challenges
Solution Approach 1:
The patent introduces different types of groups (rigid groups for structural stability, flexible groups for low melting point and wide nematic phase) at specific positions within the molecular structure. This local differentiation of functional groups allows the compound to simultaneously achieve wide nematic phase region for viewing angle enhancement and appropriate structural stability
Solution Approach 2:
The patent adjusts the ratio and types of rigid and flexible groups in the molecular structure to fine-tune the balance between structural stability and nematic phase width, enabling compounds to meet both viewing angle enhancement requirements and formulation stability
3Ease of manufacture
If polymerizable functional groups are added to liquid crystal compounds, then film workability is improved through enhanced optical anisotropy, but the molecular structure complexity increases
Solution Approach 1:
The patent combines polymerizable functional groups with liquid crystal molecular structures in a unified design. This merging allows the compound to exhibit both liquid crystalline properties for optical anisotropy and polymerization capability for improved film workability, rather than treating them as separate components
Solution Approach 2:
The patent designs liquid crystal compounds that simultaneously provide multiple functions: liquid crystallinity for optical compensation, polymerizability for film formation and adhesion, and appropriate solubility for coating processing. This multi-functionality reduces the need for separate components and simplifies the overall film structure
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 polymerizable liquid crystal compound improves the coating properties and optical performance of films, providing stable liquid crystallinity and optical anisotropy, enabling effective optical compensation and enhanced viewing angles in display devices.
Implementation Method 1
having miscibility, stability of a liquid crystal phase, a wide nematic phase region, and a low melting point
Implementation Method 2
stability of a liquid crystal phase, a wide nematic phase region
Data Source
AI summary
A polymerizable liquid crystal compound represented by Chemical Formula 1:wherein in Chemical Formula 1, groups and variables are the same as defined in the detailed description.