Birefringent RM Lens Polymerizable Mesogenic Composition
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Solution Overview
Problem
Existing birefringent RM lenses for liquid crystal displays and other optical devices face challenges such as changes in optical characteristics, reduced birefringence, and material costs due to the inclusion of non-mesogenic compounds, requiring new materials that maintain high birefringence and stability while being cost-effective for mass production.
Innovation Solution
A birefringent RM lens is developed using a polymerizable liquid crystalline medium composed exclusively of polymerizable mesogenic compounds, excluding non-mesogenic compounds to enhance birefringence and stability, with a production method involving a polymerizable liquid crystalline component A and a non-polymerizable component B, including stabilizers and photoinitiators, to achieve high birefringence and cost-efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-mesogenic compounds are included in the RM lens material, then material cost is reduced and ease of manufacture is improved, but birefringence decreases and optical characteristics become unstable
Solution Approach 1:
The patent changes the chemical composition parameters of the RM lens material by exclusively using polymerizable mesogenic compounds with specific molecular structures (formulas I-IV) and excluding non-mesogenic compounds. This parameter change maintains high birefringence (Δn≥0.10) while ensuring material stability and optical characteristic consistency throughout the lens.
Solution Approach 2:
The patent creates a composite material system consisting of multiple polymerizable mesogenic compounds with different molecular structures (cyclic and non-cyclic compounds of formulas I-IV) that work synergistically to achieve high birefringence, proper viscosity, and thermal stability without requiring non-mesogenic additives.
2Length of stationary object
If the birefringence is increased to reduce lens thickness, then the lens becomes thinner and more compact, but the manufacturing precision and alignment uniformity become more difficult to maintain
Solution Approach 1:
The patent optimizes the molecular structure parameters of the mesogenic compounds (including cyclic structures with specific ratios of formulas II-IV to formula I between 2:8 to 8:2) to achieve high birefringence (Δn≥0.10) that enables thin lens design while maintaining sufficient alignment uniformity through the inherent molecular characteristics of the mesogenic compounds.
Solution Approach 2:
The patent introduces cyclic mesogenic compounds with specific molecular geometries that create localized molecular ordering regions, enhancing alignment uniformity in specific areas of the lens material, which collectively ensures homogeneous planar alignment throughout the entire thin lens 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 solution achieves significant increases in birefringence, stability, and cost-effectiveness, ensuring high transmission and low yellowness index, while maintaining homogeneous planar alignment, suitable for various electro-optical devices like autostereoscopic 3D displays and optical drives.
Implementation Method 1
a birefringent RM lens obtainable from a polymerizable liquid crystalline medium
Implementation Method 2
polymerizable liquid crystalline medium consisting of a polymerizable liquid crystalline component A, consisting of one or more polymerizable mesogenic compounds
Data Source
AI summary
The invention relates to a birefringent RM lens obtainable from a polymerizable liquid crystalline medium consisting of - a polymerizable liquid crystalline component A, consisting of one or more polymerizable mesogenic compounds, and - a non-polymerizable component B, consisting of one or more non- polymerizable compounds and to the use of such birefringent RM lenses in electro optical devices, such as liquid crystal displays (LCDs) or other optical or electrooptical devices, for decorative or security applications.