Polymer Neutral Density Filter for Blue Light Reduction
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Solution Overview
Problem
Existing electronic devices emit harmful light spectra, particularly blue light, which can cause health issues such as eye strain, retinal damage, and disruption of circadian rhythms, and current protective measures either alter the viewing experience or fail to provide adequate protection.
Innovation Solution
A polymer-based filter incorporating an absorbing compound that selectively reduces harmful light emissions while maintaining transparency and true color rendition, using organic dyes impregnated in polycarbonate, acrylic, or PVC substrates to achieve desired optical density and mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If blue light blocking filters are applied to electronic devices, then eye strain and retinal damage are reduced, but color accuracy and viewing experience deteriorate
Solution Approach 1:
The patent applies local quality by targeting specific wavelength ranges (400-500nm blue light) for absorption while maintaining transmission of other visible wavelengths. The filter is designed to selectively block only the harmful blue light portion of the spectrum while preserving the overall color rendering and brightness of the display, thus addressing eye strain without sacrificing color accuracy.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the optical density and absorption characteristics of the filter material. By controlling the concentration and type of absorbing compounds, the filter achieves optimal blue light blocking while maintaining sufficient visible light transmission to preserve color accuracy and viewing experience.
2Object-affected harmful factors
If high energy visible light filters are used, then circadian rhythm disruption is reduced, but light transmission and brightness deteriorate
Solution Approach 1:
The patent applies local quality by targeting the specific 400-500nm wavelength range where high energy visible light causing circadian disruption is emitted. The filter is designed to block only this specific portion of the spectrum while maintaining high transmission of other visible wavelengths, thus reducing circadian disruption while preserving overall light transmission and display brightness.
3Object-affected harmful factors
If UV light filters are applied, then retinal damage is reduced, but transparency and color rendition deteriorate
Solution Approach 1:
The patent applies local quality by designing the filter to target specific UV and blue light wavelength ranges (300-500nm) for absorption while maintaining transparency in the visible spectrum. The selective absorption characteristics allow the filter to block harmful UV radiation and blue light without compromising the transparency and color rendition in the 500-700nm visible range.
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 filter effectively reduces harmful light emissions by up to 22% in the 400-500 nm range while maintaining over 90% transmission of visible light, preserving color integrity and providing mechanical durability.
Implementation Method 1
A filter for an electronic, light-emitting display device is provided. The filter comprises a polymer substrate and an absorbing compound. The absorbing agent may be dispersed within the polymer substrate. The filter may reduce at least 22% of the energy emitted by the light-emitting display device over a wavelength range of from about 400 nm to about 500 nm
Data Source
AI summary
A light-absorbing, neutral density filter for an electronic device display. More specifically, a light-absorbing, neutral density filter applied as a shield, protective film, or protective coating layer to an electronic device display or incorporated into the screen layers of a device that blocks ultraviolet light, high energy visible light, and at least a portion of blue light. The neutral density filter comprises a polymer substrate and an absorbing agent.