Light Diffusing Polymer Composition for LED Glare Reduction
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Solution Overview
Problem
Current LED diffusers lead to light transmission loss and fail to adequately control light color and temperature, resulting in harsh glare and inefficient lighting solutions.
Innovation Solution
A light diffusing polymer composition comprising a matrix polymer blended with diffuser polymer particles characterized by specific size distribution, crosslinking level, and refractive index, along with performance additives, to achieve high light transmission and controlled diffusivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED diffusers (inorganic particles or organic beads) are used to scatter light, then light diffusion is achieved, but light transmission loss increases significantly
Solution Approach 1:
The invention changes the refractive index parameter of the diffuser particles to match the matrix polymer (both set to 1.55), eliminating refractive index mismatch that causes light transmission loss. This allows adequate light diffusion while maintaining high light transmission efficiency.
Solution Approach 2:
The invention uses a composite system consisting of matrix polymer (polycarbonate or polymethylmethacrylate) blended with diffuser polymer particles. The composite achieves both light diffusion functionality and high light transmission by carefully selecting materials with matched optical properties.
2Illumination intensity
If conventional diffusers are used to provide even illumination, then glare is reduced, but control over light color and temperature is lost
Solution Approach 1:
The invention applies local quality by incorporating performance additives specifically within the diffuser particles rather than uniformly throughout the matrix. This localized approach allows customization of light properties (color, temperature) in specific regions while maintaining overall diffusion functionality.
Solution Approach 2:
The invention enables parameter changes by allowing adjustment of refractive index, particle size, and additive composition to control light color temperature and color rendering while maintaining diffusion performance.
3Illumination intensity
If light diffusing beads are added to LED packaging, then light scattering is improved, but light transmission efficiency decreases
Solution Approach 1:
The invention optimizes the refractive index parameter to match between diffuser particles and matrix polymer, minimizing light transmission loss while maintaining adequate scattering. The particle size parameter is also optimized to balance diffusion and transmission.
Solution Approach 2:
The invention achieves homogeneity in refractive index between the matrix polymer and diffuser particles, reducing optical interfaces that cause transmission loss. This homogeneous optical property allows efficient light transmission while maintaining diffusion functionality.
4Illumination intensity
If inorganic particles like TiO2 are used as scattering media, then light diffusion is achieved, but fire resistance and optical control are compromised
Solution Approach 1:
The invention uses organic polymer-based diffuser particles instead of inorganic particles, combining fire-resistant matrix materials with polymer diffusers that offer better optical control and color stability while maintaining adequate light diffusion.
Solution Approach 2:
The invention changes from inorganic to organic diffuser materials, enabling better control over optical parameters such as refractive index, color rendering, and fire resistance through polymer chemistry selection.
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 improved light distribution, reduced glare, and enhanced efficiency while allowing for customizable refractive index and color control, addressing the limitations of existing LED diffusers.
Implementation Method 1
light scattering particles or embossing are currently used to diffuse the LED light
Implementation Method 2
refractive index depending on the application and device
Data Source
AI summary
A composition comprising: a blended product of: a matrix polymer; and from 0.05 to 2.5 wt % diffuser polymer particles, wherein the diffuser polymer particles are characterized by an average diameter from 2 to 20 micrometers, a particle size distribution such that at least 90 wt % of the polymer particles fall within ±30% of the volume average particle size, a crosslinking level greater than 4%; and wherein the diffuser polymer particles comprise units derived from at least one alkyl(meth)acrylate monomer, from 5 wt % to 25 wt % units derived from a crosslinking monomer selected from the group consisting of aliphatic crosslinking monomers, aromatic crosslinking monomers and combinations thereof, optionally, units derived from one or more comonomers selected from the group consisting of aryl(meth)acrylate monomers and monovinyl arenes; and wherein from 0.1 to 20 wt % one or more performance additives dispersed within the diffuser polymer particles is provided.