Near-Infrared Absorbing Composition for Optical Structures
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Solution Overview
Problem
Conventional thin-film optical filters used in electronic devices to absorb near-infrared light often cause flare phenomena and optical distortions, especially when capturing high luminance subjects, due to their inability to effectively block near-infrared and infrared light across a broad spectrum.
Innovation Solution
A near-infrared absorbing composition comprising a copper complex with heterogeneous ligands, which provides improved near-infrared absorbance, moisture resistance, and low visible absorbance, is used to form an optical structure with multiple layers, including a first near-infrared absorption layer and an optional second absorption layer with organic dyes, to minimize optical distortions in various environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a thin-film optical filter is used to down-size and integrate with electronic devices, then the device size is reduced and integration is improved, but optical distortion phenomena such as flare occur when observing high luminance subjects
Solution Approach 1:
The patent employs a composite material system consisting of a copper complex compound combined with specific organic dyes (cyanine, carbocyanine, or carboxycyanine dyes) to create a near-infrared absorbing composition. This composite approach leverages the complementary absorption characteristics of the copper complex and organic dyes to achieve broad-spectrum near-infrared absorption while maintaining thin-film form factor, thereby preventing optical distortion without increasing device size.
Solution Approach 2:
The patent modifies the chemical composition parameters by selecting specific copper complexes with particular ligand structures (Formula 1) and combining them with organic dyes having specific absorption characteristics. By adjusting the molecular structure parameters of the absorbing compounds and their concentration ratios, the composition achieves enhanced near-infrared absorption efficiency in a thin-film configuration, effectively blocking near-infrared light while maintaining compact dimensions.
2Object-affected harmful factors
If an optical filter absorbs near-infrared light effectively, then optical distortion is reduced, but visible light absorption increases causing image quality degradation
Solution Approach 1:
The patent applies local quality by designing the copper complex compound and organic dye combination to exhibit selective absorption characteristics - strong absorption in the near-infrared region (700-1100 nm) while maintaining high transmission in the visible region (380-700 nm). The specific molecular structures and electronic transitions of the copper complex and organic dyes are tailored to create this localized spectral selectivity, allowing the filter to block only the harmful near-infrared wavelengths while preserving visible light for image capture.
3Ease of manufacture
If a conventional optical filter material is used, then manufacturing is simple, but moisture absorption resistance is poor leading to performance degradation in high humidity environments
Solution Approach 1:
The patent employs organic dye molecules and copper complex compounds that can be synthesized through relatively simple chemical processes and applied as solution-processable coatings. These molecular-level components can be manufactured using conventional coating techniques and maintain their optical properties without requiring complex fabrication equipment, achieving ease of manufacture while the specific molecular structures provide inherent moisture resistance.
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 optical structure effectively absorbs near-infrared light while maintaining low visible light absorption, reducing optical distortions and ensuring clear image capture even in high temperature/high humidity conditions, with improved solubility for organic solvents for reliable coating and performance.
Implementation Method 1
a near-infrared absorbing composition having near-infrared absorbance, solubility for an organic solvent, and moisture absorption resistivity and low visible absorbance
Data Source
AI summary
Disclosed are a near-infrared absorbing composition, an optical structure, and a camera module and an electronic device including the same. The near-infrared absorbing composition includes a copper complex represented by Chemical Formula 1.Definitions of Chemical Formula 1 are the same as described in the detailed description.