Birefringent RM Lens Composition for LCD Stability
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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, increased thickness, and high material costs due to the use of non-mesogenic compounds, which affect birefringence and stability, requiring alternative materials that maintain high birefringence and meet various stability and cost-efficiency requirements.
Innovation Solution
A birefringent RM lens is developed using a polymerizable liquid crystalline medium comprising 10-40% polymerizable mesogenic compounds and at most 5% non-mesogenic compounds, including stabilizers and photoinitiators, which improves birefringence and stability while reducing material thickness and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-mesogenic compounds are used in the lens material, then the material cost and thickness are reduced, but the birefringence and optical stability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by using polymerizable mesogenic compounds (10-40 wt%) instead of conventional non-mesogenic compounds. This parameter change maintains high birefringence (Δn ≥ 0.15) while achieving reduced thickness and improved stability, resolving the contradiction between material quantity and optical reliability
Solution Approach 2:
The patent creates a composite material system combining polymerizable mesogenic compounds with specific non-mesogenic compounds (at most 5 wt%) and photoinitiators. This composite approach enables the material to simultaneously achieve reduced thickness, high birefringence, and enhanced stability against thermal and UV stress
2Quantity of substance
If non-mesogenic compounds are used in the lens material, then the material cost is reduced, but the birefringence and stability deteriorate
Solution Approach 1:
The patent modifies the material composition parameters by incorporating polymerizable mesogenic compounds that provide inherent stability against thermal and UV stress. This parameter change achieves cost reduction through simplified composition while maintaining high stability requirements
Solution Approach 2:
The patent applies local quality by concentrating the stabilizing function in the mesogenic compound component (10-40 wt%) while using minimal non-mesogenic compounds (at most 5 wt%). This localized functional assignment reduces overall material cost while preserving stability
3Reliability
If conventional RM materials are used, then the lens provides adequate birefringence, but the lens thickness increases and transmission decreases
Solution Approach 1:
The patent changes the refractive index parameter by using polymerizable mesogenic compounds with optimized molecular structures. This enables achieving the required birefringence (Δn ≥ 0.15) with reduced thickness, improving light transmission while maintaining optical performance
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 new RM lens achieves high birefringence values, reduced lens thickness, and enhanced stability against thermal and UV stress, with improved transmission and cost-efficiency, suitable for mass production and diverse electro-optical applications.
Implementation Method 1
a polymerizable liquid crystalline medium comprising one or more polymerizable mesogenic compounds
Implementation Method 2
the birefringent nature of the RM is used to alternate the polarization of light emitted from the front of the LCD
Data Source
AI summary
The invention relates to a RM lens obtainable from a polymerizable liquid crystalline medium comprising, - a polymerizable liquid crystalline component A comprising one or more polymerizable mesogenic compounds, and - at most 12 % by weight of the total medium of a non-mesogenic component B. Moreover, the invention relates 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.