Light Diffuser with Transparent Particles for Color Accuracy
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Solution Overview
Problem
Conventional light diffusers degrade color reproducibility and have poor light transmission properties when used in optical paths of light sources, such as LED and fluorescent lamps, leading to unwanted color changes and reduced brightness.
Innovation Solution
A light diffuser composed of a thermoplastic resin with transparent particles, achieving a total light transmittance of 75% or more and a degree of dispersion of 2° or more, with a minimal difference in rectilinear light transmittance between 460 nm and 580 nm, and a controlled particle size distribution to minimize color changes and enhance light diffusion and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light diffuser is disposed on an optical path of a light source, then light diffusion property is improved, but color reproducibility and light transmission property are degraded
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of transparent particles (number average particle size 1-20 μm with specific distribution characteristics) and optimizing their content (0.1-5% by weight) in the thermoplastic resin. This controlled parameter adjustment enables the light diffuser to achieve both adequate light diffusion (D50 ≥ 2°) and high light transmission (≥75%), while maintaining color reproducibility through minimal differential transmittance (≤0.96% between 460nm and 580nm wavelengths).
Solution Approach 2:
The patent employs composite materials by combining transparent particles with specific refractive indices (1.30-1.60) with thermoplastic resins. This composite structure creates optimal light scattering centers that diffuse light effectively while maintaining high transmission and color accuracy. The composite material approach allows simultaneous achievement of light diffusion property and color reproducibility that cannot be obtained with single materials.
2Loss of energy
If a light diffuser with high light transmission is used, then light transmission property is improved, but light diffusion property is degraded
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the particle size distribution (number average 1-20 μm) and content (0.1-5% by weight) of transparent particles. This precise parameter control creates a balance where sufficient particles are present to diffuse light (achieving D50 ≥ 2°) while maintaining low enough particle concentration and appropriate size distribution to preserve high light transmission (≥75%).
Solution Approach 2:
The patent applies local quality by creating localized light scattering centers through transparent particles distributed within the thermoplastic resin matrix. The particles have specific local properties (refractive index 1.30-1.60, controlled size distribution) that enable light diffusion at specific locations, while the overall material maintains high transmission. This local scattering approach allows light diffusion without sacrificing overall transmission efficiency.
3Illumination intensity
If transparent particles with large size difference are used, then light diffusion property is improved, but color reproducibility is degraded
Solution Approach 1:
The patent applies parameter changes by strictly controlling the particle size distribution parameters: number average particle size (1-20 μm), content distribution (with specific constraints on particles of 0.9-1.1 times and 0.8-1.2 times the number average size), and refractive index (1.30-1.60). This controlled parameter range ensures uniform light scattering across different wavelengths, achieving both light diffusion (D50 ≥ 2°) and color reproducibility (differential transmittance ≤0.96% between 460nm and 580nm).
Solution Approach 2:
The patent employs homogeneity by ensuring uniform distribution of transparent particles with controlled size and refractive index characteristics throughout the thermoplastic resin. This homogeneous distribution and uniform particle properties create consistent light scattering behavior across the material, preventing wavelength-dependent color shifts while maintaining effective light diffusion. The homogeneity of particle characteristics is key to achieving both diffusion and color accuracy.
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 light diffuser that maintains color accuracy, reduces glare, and ensures adequate brightness while diffusing light effectively, suitable for lighting covers, image projection screens, and semi-transparent building materials.
Implementation Method 1
the refractive index of the transparent particles is in a range of 1.30 to 1.60, and the refractive index of the thermoplastic resin is in a range of 1.40 to 1.60
Implementation Method 2
a degree of dispersion of the light diffuser is 2° or more, wherein the degree of dispersion is defined as a transmission angle at which a light transmittance is 50% of a rectilinear light transmittance
Data Source
Figure 1
AI summary
A light diffuser and its use are provided. This light diffuser not only reduces a color change in a source light when the light diffuser is disposed on an optical path of a light source, but also has a good light transmission property and a good light diffusion property. The light diffuser contains a thermoplastic resin and transparent particles added thereto. The total light transmittance of the light diffuser is 75% or more. The degree of dispersion of the light diffuser is 2° or more, the degree of dispersion being defined as a transmission angle at which a light transmittance is 50% of a rectilinear light transmittance when light is emitted to a surface of the light diffuser in a direction normal to the surface. The difference between the rectilinear light transmittance at 460 nm and the rectilinear light transmittance at 580 nm of the light diffuser is 0.96% or less.