Optical Diffuser Composition for LED Glare and Hiding Balance
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Solution Overview
Problem
Existing LED lighting solutions struggle to balance light transmission and hiding power, often reducing light transmission when attempting to soften the harsh glare of point light sources, and current methods for measuring hiding power are qualitative and inadequate.
Innovation Solution
A transparent plastic matrix with specific particle sizes and loadings of crosslinked beads is used to create an optical diffuser for LED lighting, combining small and large particles to achieve high light transmission and hiding power, along with a quantitative method to measure hiding power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If scattering particles are added to soften LED light, then hiding power is improved, but light transmission is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling particle size (bimodal distribution with peaks at 5-10 microns and 20-50 microns), particle loading (1-10 wt%), and refractive index differences to optimize the balance between hiding power and light transmission. This quantitative approach replaces qualitative formulations with specific measurable parameters.
Solution Approach 2:
The patent uses composite materials by combining polymer particles with inorganic pigments (TiO2, ZnO, ZrO2) in specific ratios and sizes. This composite approach allows simultaneous achievement of scattering (for hiding power) and transmission properties that cannot be obtained with single materials.
2Object-generated harmful factors
If inorganic pigments like BaSO4 are added to increase hiding power, then hiding power is improved, but light transmission is dramatically decreased
Solution Approach 1:
The patent applies local quality by using different particle types in specific regions or combinations: polymer particles for primary scattering, inorganic pigments for hiding power, and refractive index-matched particles for transmission enhancement. Each component has a localized function within the overall system.
Solution Approach 2:
The patent introduces refractive index-matched particles as intermediaries that facilitate light transmission while polymer particles and inorganic pigments provide scattering and hiding power. This intermediary component mediates between the conflicting requirements of transmission and hiding.
3Measurement precision
If quantitative measurement method is developed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces subjective visual assessment with objective photometric measurement using transmittance and haze measurements. This substitution of mechanical/optical measurement systems for human judgment achieves quantitative precision while maintaining practical simplicity.
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 synergistic balance of high light transmission and hiding power in LED lighting, effectively softening the glare while maintaining efficient light distribution, and offers a reliable quantitative assessment of hiding power.
Implementation Method 1
The scattering of the light emitted by the light source is achieved by dispersing scattering particles of organic or mineral nature in the plastic
Implementation Method 2
The particles can be inorganic or organic and have mean diameters of from 0.5 to 100 microns
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to optical light diffusers for use with point light sources, such as LED lighting. The optical diffusers achieve an optimum balance of light transmission and hiding power. The optical light diffuser is a transparent plastic matrix, such as Plexiglas® resin from Arkema Inc., having organic particles dispersed within the matrix. The particles are crosslinked beads having specific particle sizes and loading. Different beads can be combined to provide added properties such as a textured surface, and to optimize hiding power and light transmission. The invention also relates to a luminous device containing at least one light-emitting diode and a cover made of the optical light diffuser. The invention further relates to a method for assessing hiding power.