Light Absorption Anisotropic Layer for Infrared Sensors
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Solution Overview
Problem
Current polarizing plates for the infrared wavelength region, such as those using iodine in polyvinyl alcohol or wire grid types, face challenges with polarization efficiency, flexibility, and handling due to insufficient nano-level processing and high costs, making them unsuitable for applications requiring touch-sensitive, curved surfaces, or large-area manufacturing.
Innovation Solution
A light absorption anisotropic layer with a dichroic coloring agent having maximal absorption between 700 to 1500 nm, averaging 0.24 to 0.50 absorbance at 850 nm, and a thickness of 5 μm or less, combined with a liquid crystalline compound, offering improved polarization efficiency and handleability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wire grid type polarizing plate is used, then polarization performance in infrared wavelength region is improved, but manufacturing complexity and cost increase due to nano-level processing requirements
Solution Approach 1:
The patent replaces expensive wire grid structures with a cost-effective dichroic coloring agent layer that can be applied through conventional coating methods. The coloring agent layer provides sufficient polarization performance for infrared wavelengths without requiring complex nano-level wire grid fabrication, thereby reducing manufacturing complexity and cost while maintaining functional effectiveness.
Solution Approach 2:
The patent changes the fundamental approach from structural polarization (wire grids) to optical absorption polarization (dichroic coloring agents). By selecting coloring agents with specific absorption characteristics in the infrared region and controlling layer thickness to 5 μm or less, the patent achieves polarization functionality through material property optimization rather than complex structural fabrication.
2Measurement precision
If PVA-stretched type polarizer with thickness of several tens of μm is used, then polarization function is achieved, but flexibility and handleability deteriorate
Solution Approach 1:
The patent reduces the layer thickness to 5 μm or less, which is a significant parameter change from conventional tens of micrometers. This thinning maintains the polarization function through optimized dichroic coloring agent concentration and distribution while dramatically improving flexibility and handleability, enabling the material to be bent and conform to curved surfaces.
Solution Approach 2:
The patent uses a composite structure combining dichroic coloring agents with a transparent polymer matrix. This composite approach allows the thin layer to maintain mechanical flexibility while preserving optical polarization functionality, as the polymer provides structural support and the coloring agent provides the polarization effect.
3Measurement precision
If conventional polarizing plates are used, then polarization is achieved, but weight and handling difficulty increase
Solution Approach 1:
The patent dramatically reduces weight by thinning the polarizing layer to 5 μm or less and using lightweight polymer-based materials instead of heavier conventional polarizer structures. This parameter change in thickness and material composition maintains polarization performance while reducing weight to negligible levels, improving handling and enabling flexible applications.
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 provides a high signal-to-noise ratio for generating polarized light in the infrared wavelength region, is lightweight, and suitable for various applications, including sensors and displays, while being cost-effective and easy to handle.
Implementation Method 1
a dichroic coloring agent having a maximal absorption at a wavelength of 700 to 1500 nm, in which an average absorbance at a wavelength of 850 nm is 0.24 to 0.50
Implementation Method 2
further comprising: a liquid crystalline compound
Data Source
AI summary
A light absorption anisotropic layer which has a high S/N ratio for generating polarized light with respect to rays in an infrared wavelength region, is lightweight, and has excellent handleability, a laminate, and a sensor system including the light absorption anisotropic layer or the laminate. The light absorption anisotropic layer contains a dichroic coloring agent having a maximal absorption at a wavelength of 700 to 1500 nm, in which an average absorbance at a wavelength of 850 nm is 0.24 to 0.50 and a thickness is 5 μm or less.