LED Diffuser Blend Materials for Light Transmission and Hiding Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LED lighting applications face challenges in achieving balanced light transmission and hiding power, as existing diffusers either reduce light transmission or fail to effectively soften the harsh glare of high-luminance LEDs, often requiring high particle loading which compromises on color properties.
Innovation Solution
A translucent thermoplastic article comprising a blend of organic and inorganic diffusing particles within a refractive index-mismatched polymer matrix, optimized for high light transmission (>40%) and high hiding power (>85%), using specific particle sizes and loadings to achieve synergistic light diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scattering particles are added to the plastic cover to soften LED light, then light diffusion is improved, but light transmission is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling particle size (0.5 to 100 microns), particle concentration (3-30% by weight), and refractive index differences between particles and matrix. These parameter optimizations enable the diffuser to achieve effective light scattering while minimizing light transmission loss, resolving the contradiction between light diffusion and light transmission.
Solution Approach 2:
The patent uses composite materials by combining organic scattering particles with inorganic pigments (such as TiO2, ZnO, BaSO4, SiO2, CaCO3, AL2O3) within a transparent plastic matrix. This composite approach provides both light scattering functionality and enhanced hiding power, while maintaining acceptable light transmission levels.
2Object-generated harmful factors
If inorganic pigments are added to increase hiding power, then hiding properties are improved, but light transmission is dramatically decreased
Solution Approach 1:
The patent applies parameter changes by carefully selecting inorganic pigment types, controlling their particle size distribution, and optimizing their concentration levels. This parameter optimization enables the formulation to achieve sufficient hiding power to mask the light source shape while maintaining adequate light transmission, resolving the contradiction between hiding properties and light transmission.
3Object-generated harmful factors
If high particle loading is used to achieve high hiding power, then hiding properties are improved, but color properties are compromised
Solution Approach 1:
The patent applies parameter changes by optimizing particle loading concentrations and selecting particles with specific refractive indices that match or complement the matrix polymer. This parameter optimization enables the formulation to achieve high hiding power while preserving good color properties and optical clarity, resolving the contradiction between hiding power and color properties.
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 provides a diffuser with high luminous transmission, optical haze, and diffuse light scattering, effectively softening LED light while maintaining good color properties and reducing glare, suitable for various lighting applications.
Implementation Method 1
The scattering of the light emitted by the light source can be achieved by dispersing scattering particles of organic or mineral nature in the plastic
Implementation Method 2
a) from 0.01 to 20 weight percent of organic polymer diffusing particles that are refractive index (R.I.) mis-matched to the matrix polymer, wherein the absolute difference between the matrix polymer and diffusing organic polymer particles is from greater than 0.02 to 0.2
Data Source
AI summary
The invention relates to blend materials useful in LED lighting applications. The diffusing particle blend is a synergistic mixture of selected organic particles and selected inorganic particles of specific composition, loading, and a refractive index difference with the matrix polymer, that provide excellent light diffusion, high hiding properties and good light transmission. Articles made of this blend are useful in commercial and residential lighting, motor vehicle illumination (lights, panels), street lighting, displays and signs.