Cu-porphyrin optical filter for selective blue light blocking
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Solution Overview
Problem
Current technologies fail to effectively filter out blue light in the 400-500 nm range, which poses a risk to ocular health due to its high energy and potential for photochemical damage, while existing blue-light blocking solutions often compromise on color perception and transmission of other visible light wavelengths.
Innovation Solution
A Cu-porphyrin compound-based optical filter with a specific structure is used to selectively filter blue light, incorporating the compound into coatings or substrates, ensuring high transmission of visible light across the 460-700 nm range while reducing blue light exposure by at least 5% at peak hazardous wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional blue light filtering technologies are used, then blue light blocking is achieved, but color perception and transmission of other visible light wavelengths are compromised
Solution Approach 1:
The patent applies local quality by using a spectral filter with non-uniform transmission characteristics that selectively blocks blue light wavelengths (400-500 nm) while maintaining high transmission in other visible wavelength ranges. The filter's transmission profile is optimized to have different properties at different wavelengths, achieving localized filtering action only where harmful blue light exists while preserving overall visibility and color perception.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the spectral transmission parameters of the filter. The filter is designed with specific transmission characteristics including a transmission minimum in the blue light range (400-500 nm) and transmission maxima in other visible ranges, with the sum of transmission values across all wavelengths maintained above 50%. This parametric optimization allows selective blue light blocking while preserving adequate overall light transmission for vision.
2Object-affected harmful factors
If blue light filtering is implemented, then ocular protection is improved, but brightness and visibility are reduced
Solution Approach 1:
The patent optimizes transmission parameters by designing the spectral filter to maintain a sum of transmission values across all visible wavelengths above 50%, while creating a localized transmission minimum specifically in the blue light range (400-500 nm). This parametric control ensures that blue light blocking provides ocular protection while the overall brightness and visibility are preserved through adequate transmission in green and red wavelength ranges.
Solution Approach 2:
The patent applies partial action by implementing selective filtering only in the blue light wavelength range (400-500 nm) rather than blocking all visible light. The filter allows excessive transmission in non-blue ranges to compensate for the partial blocking in blue ranges, ensuring that overall illumination intensity remains sufficient for normal vision while providing targeted protection against photochemical damage from blue light.
3Object-affected harmful factors
If existing filter technologies are used, then some blue light blocking is achieved, but filtering effectiveness in the 400-500 nm range is insufficient
Solution Approach 1:
The patent employs composite materials by using a spectral filter that combines multiple wavelength-selective properties within a single filtering element. The filter integrates transmission characteristics across the entire visible spectrum with optimized blocking in the blue light range (400-500 nm), effectively combining the functions of multiple specialized filters into one composite structure that achieves superior blue light filtering without increasing device complexity.
Solution Approach 2:
The patent applies universality by designing a single spectral filter that performs multiple functions simultaneously: it blocks blue light (400-500 nm) to protect against photochemical damage, maintains adequate overall light transmission (>50% sum of transmission values), and preserves color perception by allowing transmission in green and red ranges. This multi-functional filter eliminates the need for separate filtering components for each function.
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 Cu-porphyrin compound filter effectively reduces blue light transmission in the 400-460 nm range, minimizing photochemical damage while maintaining over 80% transmission of visible light and preserving color perception, thus providing enhanced ocular protection without compromising photopic vision or color vision.
Implementation Method 1
an optical filter comprising a Cu-porphyrin compound... selectively filters blue light... reduces blue light exposure by at least 5% at peak hazardous wavelengths
Data Source
Figure 1A
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Figure 1C
AI summary
A system is provided comprising an optical filter. The optical filter comprises a Cuporphyrin dye compound. The transmission spectrum of the system has an average transmission across the wavelength range of 460nm-700 nm of at least 80%. The transmission spectrum of the system has an average transmission across the wavelength range 400nm-460nm that is less than 75%.