Copper Complex Near-Infrared Absorbing Layer for Optical Distortion Control
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Solution Overview
Problem
Existing near-infrared absorbing films in electronic devices, such as camera modules, face challenges in minimizing optical distortion caused by near-infrared light, especially in high temperature/high humidity environments, due to limitations in hygroscopic resistance and optical properties.
Innovation Solution
An optical structure comprising a transparent substrate, a first moisture-proof layer with a copper complex near-infrared absorbing layer, and optionally a second near-infrared absorbing layer, designed to maintain excellent near-infrared absorbance and low visible absorbance, even in harsh environments, by using specific organic materials with low water vapor transmission rates and saturated absorption rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional near-infrared absorbing film is used, then near-infrared light absorption is achieved, but hygroscopic resistance deteriorates in high temperature/high humidity environments
Solution Approach 1:
The patent uses a composite material structure consisting of a copper complex near-infrared absorbing layer combined with a moisture-proof organic layer. This composite structure provides both near-infrared absorption capability and hygroscopic resistance, resolving the contradiction between optical function and environmental stability.
Solution Approach 2:
The patent changes the chemical composition parameters of the absorbing layer by using specific copper complexes with particular ligands (phosphate, phosphonate, sulfate, or sulfonate groups) and adjusts the moisture-proof layer properties by selecting organic materials with specific water vapor transmission rates and saturated absorption rates, thereby achieving both optical performance and environmental resistance.
2Productivity
If the near-infrared absorbing film is made thinner, then device integration is improved, but optical distortion resistance deteriorates
Solution Approach 1:
The patent changes the material composition rather than increasing thickness, using copper complexes with specific ligands that provide high near-infrared absorption efficiency per unit thickness, allowing thin film design while maintaining optical distortion resistance.
Solution Approach 2:
The patent replaces the conventional approach of using thick films for absorption with a chemically optimized thin film system where the copper complex composition provides enhanced absorption efficiency, substituting physical thickness with chemical effectiveness.
3Object-affected harmful factors
If a near-infrared absorbing film with high absorption rate is used, then optical distortion is minimized, but visible light absorbance increases
Solution Approach 1:
The patent applies local quality by designing the copper complex to have selective absorption characteristics - the ligand structure is specifically chosen to create absorption bands in the near-infrared region while maintaining transparency in the visible region, achieving wavelength-selective optical properties.
Solution Approach 2:
The patent adjusts the chemical parameters of the copper complex, specifically selecting ligands with particular chemical groups (phosphate, phosphonate, sulfate, sulfonate) that tune the absorption spectrum to absorb near-infrared light while transmitting visible light, thereby resolving the contradiction between absorption efficiency and visible light transmission.
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 minimizes optical distortion and maintains clear images in various environments, including high temperature/high humidity conditions, by ensuring excellent near-infrared absorbance and low visible absorbance, thus enhancing the performance of camera modules and electronic devices.
Implementation Method 1
a first near-infrared absorbing layer disposed between the transparent substrate and the first moisture-proof layer and including a copper complex
Implementation Method 2
the first organic material having moisture-proof properties has a water vapor transmission rate (WVTR) of less than or equal to about 100 g/m2/day
Data Source
AI summary
Disclosed are an optical structure, and a camera module and an electronic device including the same. The optical structure includes a transparent substrate; a first moisture-proof layer disposed on the transparent substrate and including a first organic material having moisture-proof properties; and a first near-infrared absorbing layer disposed between the transparent substrate and the first moisture-proof layer and including a copper complex, wherein the first organic material having moisture-proof properties has a water vapor transmission rate (WVTR) of less than or equal to about 100 g/m2/day measured at a thickness of 100 μm.