Chiral Nematic Liquid Crystal Optical Filter Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical filter technologies face challenges in producing large-area, cost-effective filters with precise wavelength control, particularly for laser protection and flexible substrates, due to the need for expensive vacuum deposition processes and limited substrate flexibility.
Innovation Solution
A method involving the deposition of chiral nematic liquid crystals onto substrates with uniform rolling pressure to align the helical axis perpendicular to the substrate, followed by UV curing, allowing for the creation of aligned polymerized liquid crystal layers that function as optical filters without solvents or vacuum processes, enabling customizable optical properties on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If interference-like filters are produced using vacuum deposition of dielectric layers, then precise control of optical characteristics is achieved, but production cost increases and manufacturing complexity increases
Solution Approach 1:
The patent changes the fundamental parameter of filter production from vacuum deposition of dielectric layers to solution processing of liquid crystal materials. This allows precise optical control through liquid crystal orientation control rather than layer thickness control, eliminating the need for complex vacuum deposition equipment and processes while maintaining spectral precision.
Solution Approach 2:
The patent replaces the mechanical vacuum deposition system with a chemical solution processing approach. Instead of physically depositing layers in vacuum, the liquid crystal material is applied from solution and oriented through chemical alignment layers, substituting a complex mechanical system with a simpler chemical process.
2Manufacturing precision
If interference-like filters are produced using vacuum deposition, then precise wavelength control is achieved, but production cost increases
Solution Approach 1:
The patent uses inexpensive liquid crystal materials and standard solution processing techniques instead of expensive vacuum deposition equipment. The liquid crystal films can be produced on flexible substrates using low-cost coating methods, dramatically reducing manufacturing cost while maintaining precise wavelength control through liquid crystal pitch control.
Solution Approach 2:
The patent changes the control parameter from layer thickness (requiring precise vacuum deposition) to liquid crystal pitch (controlled by temperature and composition), enabling precise wavelength control through simpler, cheaper solution processing parameters.
3Manufacturing precision
If traditional filter production methods are used, then optical characteristics can be controlled, but substrate flexibility is limited
Solution Approach 1:
The patent uses flexible substrates such as plastic films that can be bent or conform to surfaces, replacing rigid glass substrates. The liquid crystal film is applied directly to these flexible substrates and maintains its optical properties, enabling the filter to be bent, rolled, or conformal to complex shapes while preserving wavelength selectivity.
Solution Approach 2:
The patent changes the substrate material parameter from rigid glass to flexible plastic, and the film formation parameter from vacuum deposition to solution coating, allowing the same optical control to be achieved on flexible substrates that can be bent or conformal to complex shapes.
4Manufacturing precision
If vacuum deposition processes are used, then optical filters can be produced, but production scale is limited
Solution Approach 1:
The patent replaces the vacuum deposition mechanical system with solution processing, enabling large-area production through coating techniques that can cover entire substrates at once. This allows production of filters larger than what can be handled by vacuum deposition equipment, scaling up to industrial production levels.
Solution Approach 2:
The patent changes the production method from vacuum deposition to solution coating, allowing continuous processing of large substrates and enabling industrial-scale manufacturing while maintaining optical precision through controlled liquid crystal orientation.
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
This method simplifies the production of optical filters, enabling precise control over reflected wavelengths and transmission intensity, suitable for large-area applications, including laser protection, while reducing production costs and eliminating the need for vacuum deposition, thus achieving high optical customization with lower complexity and cost.
Implementation Method 1
cholesteric liquid crystals, can be used to make optical filter materials using the fundamental principle of selective reflection of light property of these materials
Implementation Method 2
followed by UV curing, allowing for the creation of aligned polymerized liquid crystal layers
Data Source
AI summary
A method of aligning a chiral nematic liquid crystal (103), the method comprising depositing a first chiral nematic liquid crystal (103) onto a first substrate (102), positioning a second substrate (104) on top of the liquid crystal (103) to form an initial layer structure and then applying rolling pressure to at least one of the substrates (102, 104) of the initial layer structure to create a final layer structure in which the first chiral nematic liquid crystal (103) is aligned with a helical axis substantially perpendicular to a local plane of the first substrate (102). Aspects of the invention provide optical filter materials for laser protection applications, LED emission filtering and lighting, augmented reality display coatings.