UV Blocking Metal Nanoparticle Coating for Display Visibility
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Solution Overview
Problem
Image display apparatuses face challenges in accurately embodying intended colors due to UV light leakage from light-emitting devices, which is exacerbated by interference from different light sources and material filters, leading to color distortion and reduced visibility.
Innovation Solution
A UV light-blocking composition using metal nanoparticles that absorb and block UV light wavelengths through surface plasmon resonance, combined with a dielectric, is applied to image display apparatuses to prevent UV light leakage and improve visibility. This composition includes metals like gold, silver, and dielectrics like silicon dioxide or titanium dioxide, allowing for the adjustment of surface plasmon-absorbing wavelengths to desirable locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If UV light-emitting devices are used in image display apparatuses, then the visibility and brightness are improved, but UV light leakage occurs causing color distortion
Solution Approach 1:
A light-blocking composition is introduced as an intermediary layer between the UV light-emitting device and the display medium. This composition contains metal nanoparticles (silver, gold, or copper) that act as mediators to absorb UV light through surface plasmon resonance, preventing UV leakage while maintaining visibility. The dielectric material serves as another intermediary to tune the plasmon resonance wavelength to match the UV spectrum.
Solution Approach 2:
The patent changes the physical and chemical parameters of the light-blocking composition to optimize UV absorption. Specifically, it controls the particle size of metal nanoparticles (1-100 nm), adjusts the dielectric constant of surrounding materials, and modifies the shape and distribution of particles to shift the surface plasmon resonance peak into the UV range, thereby achieving effective UV blocking without compromising visible light transmission.
2Power
If multiple light-emitting devices are used, then the functionality and brightness are enhanced, but UV light interference and color accuracy deteriorate
Solution Approach 1:
The light-blocking composition serves as a universal intermediary layer that can be applied across multiple light-emitting devices simultaneously. It mediates the interaction between UV photons from various sources and the display medium, consistently filtering UV wavelengths regardless of the number or type of light-emitting devices used, thereby maintaining color accuracy while preserving brightness enhancement.
Solution Approach 2:
The patent employs composite materials combining metal nanoparticles with dielectric materials to create a multifunctional light-blocking layer. This composite structure leverages the plasmon resonance properties of metals and the optical tuning capabilities of dielectrics to achieve broad-spectrum UV blocking while maintaining compatibility with multiple light-emitting device types and configurations.
3Object-affected harmful factors
If conventional light-blocking materials are used, then UV light absorption is achieved, but visibility and color accuracy are reduced
Solution Approach 1:
The patent applies local quality by making the light-blocking properties location-specific through surface plasmon resonance. The metal nanoparticles are designed to resonate at specific UV wavelengths while remaining transparent to visible light wavelengths. This localized optical response allows the material to block UV light selectively at certain wavelengths without affecting visibility, creating spatially selective transparency.
Solution Approach 2:
By changing the particle size, material composition, and structural parameters of the metal nanoparticles, the patent tunes the surface plasmon resonance frequency to match UV wavelengths. This parameter optimization enables the material to achieve high UV absorption efficiency while maintaining high visible light transmission, thereby resolving the contradiction between UV blocking and visibility.
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 UV light-blocking composition effectively absorbs and blocks UV light wavelengths, preventing color distortion and enhancing visibility in image display apparatuses by shifting surface plasmon-absorbing wavelengths, thereby improving the accuracy of color representation and maintaining white light in electronic devices.
Implementation Method 1
a metal nanoparticle that absorbs and blocks a UV light wavelength using a surface plasmon-absorbing wavelength
Implementation Method 2
The location of a surface plasmon-absorbing peak can be predicted by a well-known Mie resonance condition... when gold is coated with silicon dioxide (SiO2), a wavelength is transited from about 510 nm to about 540 nm, and when gold is coated with titanium dioxide (TiO2), a wavelength is transited to about 640 nm
Data Source
AI summary
Disclosed herein is an ultraviolet (UV) light-blocking composition comprising a metal nanoparticle that absorbs and blocks a UV light wavelength using a surface plasmon-absorbing wavelength, and a dielectric. The UV light-blocking composition is capable of absorbing and blocking a UV light wavelength or, a specific wavelength, using the surface plasmon-absorbing wavelength of the metal nanoparticle or, the plasmon-absorbing wavelength transited by the dielectric, thereby demonstrating increased visibility when applied to an image display apparatus such as a mobile phone, and the like.