Polymerizable Compound for Uniform Polarized Light Conversion
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Solution Overview
Problem
Existing retardation films in flat panel displays face challenges in achieving uniform polarized light conversion over a wide wavelength band due to wavelength dispersion, high melting points of low-molecular-weight polymerizable compounds, and high production costs.
Innovation Solution
A polymerizable compound represented by formula (I) is used to produce a polymerizable composition that includes an initiator, resulting in a polymer with a low melting point, excellent solubility, and the ability to create an optical film with uniform polarized light conversion across a wide wavelength band at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a low-molecular-weight polymerizable compound is used to reduce film thickness, then the retardation film thickness can be reduced, but the melting point becomes too high for industrial processing
Solution Approach 1:
The patent modifies the molecular structure of the polymerizable compound by introducing specific chemical groups and adjusting molecular weight parameters. This allows achieving a lower melting point while maintaining the low molecular weight necessary for thin film formation, thus resolving the contradiction between reduced thickness and manageable melting point for industrial processing
Solution Approach 2:
The patent creates a composite polymerizable compound that combines multiple functional groups and structural elements. This composite structure enables simultaneous achievement of low melting point for ease of processing and appropriate molecular weight for thin film application, resolving the contradiction between film thickness reduction and processing temperature
2Length of stationary object
If existing low-molecular-weight polymerizable compounds are used, then thin films can be produced, but the production cost increases due to expensive reagents and multiple synthesis steps
Solution Approach 1:
The patent segments the synthesis process into fewer steps with simpler reactions, reducing the number of expensive reagents required. By simplifying the synthetic pathway while maintaining the ability to produce thin films, the production cost is reduced without compromising film thickness control
Solution Approach 2:
The patent employs cheaper, more readily available reagents and simplifies the synthesis procedure, replacing expensive multi-step processes with more economical alternatives. This approach reduces production cost while still enabling the formation of thin retardation films through the polymerizable compound
3Measurement precision
If conventional retardation films are used, then specific monochromatic light conversion is accurate, but uniform polarized light conversion over wide wavelength band cannot be achieved
Solution Approach 1:
The patent modifies the optical parameters of the polymerizable compound, specifically the wavelength dispersion characteristics, by adjusting the molecular structure. This enables the material to achieve reverse wavelength dispersion, allowing uniform polarized light conversion across a wide wavelength band while maintaining adequate performance for specific wavelengths
4Length of stationary object
If polymerizable compounds with narrow liquid crystallinity temperature range are used, then thin films can be formed, but the applicable temperature range for processing becomes very limited
Solution Approach 1:
The patent adjusts the temperature parameters of the polymerizable compound by modifying its molecular structure. This expands the liquid crystallinity temperature range, providing a broader processing window for thin film formation while maintaining the ability to produce thin retardation films
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 enables the production of optical films with low reflected luminance and uniform polarized light conversion over a wide wavelength band, suitable for use in thin retardation films, reducing production costs and improving performance.
Implementation Method 1
A polymerizable compound represented by formula (I) and a polymerizable composition including an initiator are used to produce a polymer
Implementation Method 2
an optical film that achieves uniform conversion of polarized light over a wide wavelength band
Implementation Method 3
uniform conversion of polarized light
Data Source
AI summary
A polymerizable compound has a practical low melting point, excellent solubility in a general-purpose solvent, and can produce an optical film at low cost, exhibits low reflected luminance, and achieves uniform conversion of polarized light over a wide wavelength band, an optically anisotropic article.