Composite LED Diffuser with Coated Fibers for Thermal Management
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Solution Overview
Problem
High power LED-based lighting units face challenges in thermal management due to the limited thermal conductivity of traditional diffuser materials used in their enclosures, which can lead to inadequate heat dissipation, especially in compact and lightweight designs required for area lighting applications.
Innovation Solution
A composite material is used for the diffuser portion of the LED-based lighting unit, comprising a polymeric matrix material and a fiber material with an opaque diffusive white coating, enhancing thermal conductivity and optical scattering effects while maintaining translucence, allowing for efficient heat transfer and omnidirectional lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional diffuser materials are used in LED enclosures, then the lighting unit maintains simplicity in design, but the thermal conductivity is insufficient leading to inadequate heat dissipation
Solution Approach 1:
The patent applies composite materials by combining a polymeric matrix material with fiber material having high thermal conductivity. The fiber material (such as aluminum nitride or boron nitride fibers) is dispersed within the polymeric matrix to create a composite diffuser that simultaneously provides optical scattering and enhanced thermal conductivity, resolving the contradiction between heat dissipation performance and material simplicity
2Loss of energy
If fiber material with high thermal conductivity is added to the polymeric matrix, then heat transfer efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent utilizes parameter changes by controlling the size, shape, and concentration of fiber materials within the polymeric matrix. By optimizing these parameters, the composite material achieves enhanced thermal conductivity while maintaining ease of manufacturing through standard extrusion or injection molding processes, thus improving heat transfer efficiency without proportionally increasing manufacturing complexity
3Illumination intensity
If the diffuser portion uses composite material with fiber coating, then optical scattering and thermal conductivity are enhanced, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the fiber material with an opaque diffusive white coating that simultaneously provides optical scattering for omnidirectional lighting and serves as a thermal management component. The coated fiber structure performs multiple functions - light diffusion and heat conduction - within a single material element, thereby enhancing lighting performance without proportionally increasing device complexity
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 composite material effectively promotes heat transfer and retains the desired optical properties, enabling efficient heat dissipation and omnidirectional lighting capabilities in LED-based lighting units, addressing the limitations of traditional materials.
Implementation Method 1
the fiber material contributes an optical scattering effect to the visible light passing through the composite material
Implementation Method 2
the fiber material causes the composite material to have a thermal conductivity greater than that of the polymeric matrix material
Data Source
AI summary
Thermal management approaches and methods for structures requiring certain optical and thermal properties, for example, components of LED-based lighting units. Such a structure is in thermal communication with a source of visible light and thermal energy, and visible light emitted by the source passes through the structure. The structure includes a portion formed of a composite material containing a polymeric matrix material and a fiber material that contributes an optical scattering effect to the visible light passing through the composite material. The fiber material is made up of individual fibers that each comprise a core material and an opaque diffusive white coating on an external surface thereof. The fiber material and its coating contribute to the thermal conductivity and an optical scattering effect of the composite material.