Absorbing Phosphor Polymer Substrates for Blue Light Reduction
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Solution Overview
Problem
Handheld electronic devices often emit high levels of blue and UV light, which can be harmful to eye health and disrupt natural circadian rhythms, while existing displays prioritize resolution and color over eye safety and battery life.
Innovation Solution
Incorporating absorbing compounds, such as phosphors and dyes, into polymer substrates to reduce transmissivity of harmful light wavelengths, including blue and UV light, while maintaining color integrity and improving light quality by adjusting absorption and emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If absorbing compounds are added to reduce blue and UV light transmission, then eye safety is improved, but total light transmission is reduced
Solution Approach 1:
The patent applies local quality by using wavelength-selective absorbing compounds that specifically target harmful blue (415-555 nm) and UV (380-400 nm) light wavelengths while allowing other visible wavelengths to pass through. This selective absorption approach protects eyes from harmful radiation without significantly reducing overall light transmission and display brightness.
Solution Approach 2:
The patent employs composite materials by combining polymer substrates with dispersed absorbing compounds (dyes, phosphors, or other light-absorbing materials) to create a protective layer that integrates both structural support and selective light absorption functions. This composite structure achieves eye protection while maintaining optical performance.
2Object-affected harmful factors
If absorbing compounds are added to filter harmful light, then harmful light reduction is improved, but color spectrum integrity is worsened
Solution Approach 1:
The patent uses absorbing compounds with specific absorption spectra that are localized to harmful wavelength regions (blue and UV) while leaving the rest of the visible spectrum relatively unaffected. This localized absorption approach filters harmful light while preserving color spectrum integrity and display color accuracy.
Solution Approach 2:
The patent optimizes the absorption characteristics of the compounds by selecting materials with peak absorption wavelengths aligned with harmful blue and UV regions. By carefully controlling absorption parameters and compound concentrations, the patent achieves effective harmful light reduction while maintaining natural color perception across the visible spectrum.
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 solution effectively reduces exposure to harmful light, enhancing eye safety and battery life while maintaining color accuracy and image quality, ensuring that the light emitted is safer and more energy-efficient.
Implementation Method 1
The shield may comprise an absorbing agent dispersed within the polymer substrate. The shield may reduce a transmissivity of an ultraviolet range of light by at least 90%, wherein the ultraviolet range of light comprises a range between 380 and 400 nanometers
Implementation Method 2
YAG may be made of fine particle of Yttrium Aluminum Garnet. When incorporated into devices, such as LEDs, materials such as YAG doped with other elements, such and Cerium or others that may have beneficial photoluminescent properties (YAG:Ce), then the resulting combination may convert blue light to white or yellow
Data Source
AI summary
A display system for use with electronic display devices comprising an electronic display device, and a backlight unit. The backlight unit comprises a light-emitting array, a reflector adjacent to the light-emitting array, and a diffuser opposite the reflector. The diffuser comprises a polymer substrate, an absorbing phosphor combined with the polymer substrate, wherein the absorbing phosphor absorbs blue light, from the light-emitting array, in a blue notch band. The absorbing phosphor has a maximum absorbance peak between about 400 nm and about 530 nm, and wherein the absorbing phosphor re-emits the absorbed blue light between 495 nm and 675 nm.