Polymerizable Liquid Crystal Compound for Thin Optically Anisotropic Films
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Solution Overview
Problem
Existing liquid crystal compounds with high birefringence face challenges in orientation when coated on films, limiting their industrial application due to issues with membrane orientation.
Innovation Solution
A polymerizable liquid crystal compound with a specific chemical structure, featuring a center benzene ring substituted with an alkyl group and at least one imine and naphthalene group, which exhibits high birefringence and excellent orientation during coating, allowing for the creation of thin, optically anisotropic bodies with superior optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid crystal compounds with high birefringence are used, then the necessary retardation value can be realized with small quantity of liquid crystal compounds and thinner film can be prepared, but orientation problem occurs when the compounds are coated on a film
Solution Approach 1:
The patent modifies the chemical structure parameters of liquid crystal compounds by introducing specific groups (imine group, naphthalene ring) and adjusting molecular characteristics to achieve both high birefringence and good coating orientation. This resolves the contradiction by changing the fundamental properties of the material rather than adjusting processing parameters.
Solution Approach 2:
The patent creates composite molecular structures combining different functional groups (imine group, naphthalene ring, alkyl group) within the liquid crystal compound. This composite approach allows the molecule to simultaneously exhibit high birefringence and good orientational behavior during coating, resolving the contradiction between optical performance and manufacturing quality.
2Length of stationary object
If liquid crystal compounds with high birefringence are used, then thinner film can be prepared, but orientation problem occurs when coated on film
Solution Approach 1:
The patent changes the molecular parameters of the liquid crystal compound by introducing specific functional groups and structural motifs that simultaneously enable thin film formation and maintain excellent orientation during the coating process, eliminating the trade-off between film thickness and orientation quality.
Solution Approach 2:
The liquid crystal compound is designed to self-align during the coating process through its molecular structure, eliminating the need for complex alignment procedures. The compound inherently exhibits good orientational behavior when coated, allowing thin film preparation without sacrificing orientation precision.
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 compound achieves high birefringence and excellent orientation, enabling the production of thin, high-performance optically anisotropic bodies with reduced light leakage and improved optical properties.
Implementation Method 1
A phase retarder is a type of optical element changing the polarization state of light passing through the same... the polarization direction (direction of electric field vector) becomes a sum of two elements (an ordinary ray and an extraordinary ray) parallel or perpendicular to the optic axis, and changes after passing the phase retarder because the vector sum of two elements varies according to the birefringence and the thickness of the phase retarder
Implementation Method 2
polymerizable liquid crystal compound... L1 and L2 are independently hydrogen or a polymerizable group
Data Source
AI summary
The present invention relates to a polymerizable liquid crystal compound, a liquid crystal composition including the same, and an optically anisotropic body. The polymerizable liquid crystal compound according to the present invention has not only high birefringence but also excellent coating orientation, and thus it is possible to prepare a optically anisotropic body which is thin but superior in optical properties.