Near-Infrared Absorbing Composition for Camera Modules
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Solution Overview
Problem
Existing optical filters in electronic devices, such as camera modules, suffer from flare phenomena due to near-infrared light absorption, leading to optical distortion, especially in high luminance conditions, and exhibit reliability issues in high temperature/high humidity environments.
Innovation Solution
A near-infrared absorbing composition comprising a copper complex, metal oxide particles, an amine-based compound, and a polymerizable compound with 2 to 4 functional groups, which forms a near-infrared absorption layer with improved absorbance and reliability, minimizing optical distortion and curl occurrence even at increased thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a thin-film optical filter is used to reduce device size, then down-sizing and high integration are achieved, but flare phenomenon occurs in high luminance conditions
Solution Approach 1:
The patent uses a composite material system consisting of copper complex compound and organic compound with specific molecular structures. This composite absorption layer combines the near-infrared absorption capability of copper complexes with the optical stability of specially designed organic compounds, achieving effective near-infrared blocking without the flare phenomenon while maintaining thin-film form factor for device down-sizing.
Solution Approach 2:
The patent modifies the molecular structure parameters of the organic compound (specifically the amine-based compound with defined chemical formula and substituents) to optimize both near-infrared absorption and optical stability. By adjusting the chemical structure parameters including the amine group configuration and aromatic ring substituents, the material achieves high near-infrared absorbance while preventing flare in high luminance conditions.
2Object-generated harmful factors
If conventional optical filter materials are used to absorb near-infrared light, then near-infrared absorption is achieved, but reliability deteriorates in high temperature/high humidity environments
Solution Approach 1:
The patent creates a composite system where the copper complex compound is combined with a specifically designed organic compound containing amine groups and aromatic rings. This composite structure provides both strong near-infrared absorption and enhanced environmental stability, preventing degradation in high temperature and high humidity conditions while maintaining optical performance.
Solution Approach 2:
The patent introduces specific functional groups (amine groups with defined R1-R6 substituents) at local positions within the organic compound structure to enhance environmental stability. The local chemical environment around the copper complex is optimized through coordination with the amine-based organic compound, providing resistance to humidity and temperature variations while maintaining near-infrared absorption capability.
3Object-generated harmful factors
If the optical filter thickness is increased to improve near-infrared absorption, then absorbance is improved, but curl occurrence increases
Solution Approach 1:
The patent optimizes the chemical structure parameters of the organic compound (molecular weight, functional group configuration, aromatic ring structure) to achieve the desired near-infrared absorbance with minimal thickness. By changing the molecular parameters of the amine-based compound, the absorption efficiency is maximized per unit thickness, allowing thin-film formation that prevents curl while achieving sufficient near-infrared blocking.
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 composition effectively absorbs near-infrared light, reducing optical distortion and maintaining low visible light absorbance, while ensuring reliability and preventing curl formation in high temperature/high humidity conditions, thus enhancing the performance of camera modules and electronic devices.
Implementation Method 1
a near-infrared absorbing composition includes a copper complex; a metal oxide particle
Implementation Method 2
a polymerizable compound having 2 to 4 functional polymerizable groups
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, a metal oxide particle, an amine-based compound represented by Chemical Formula 1, and a polymerizable compound having 2 to 4 functional polymerizable groups.N(R1)(R2)(R3) [Chemical Formula 1]Definitions of Chemical Formula 1 are the same as described in the detailed description.