Graphite Composite Substrate Structure for LED Heat Dissipation
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Solution Overview
Problem
Current light emitting devices face challenges in heat dissipation, which limits the luminance and efficiency of light emitting elements.
Innovation Solution
A substrate design featuring a first member with a through hole and a second member inside, where the second member has distinct regions with varying volume fractions of graphite and thermally conductive materials, enhancing heat dissipation and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a uniform graphite-containing material is used throughout the heat dissipation structure, then heat dissipation is improved, but structural strength and precision are compromised
Solution Approach 1:
The patent applies local quality by creating distinct regions within the heat dissipation structure: a first region with high graphite content (70-100 vol%) for superior heat dissipation, a second region with intermediate graphite content (30-70 vol%) for balanced performance, and a third region with low or no graphite (0-30 vol%) for structural strength and precision. This spatial variation in material composition allows each region to optimize for its specific functional requirements.
Solution Approach 2:
The patent employs composite materials by combining graphite particles with metal or ceramic matrices in different proportions across the structure. The first region uses graphite-metal or graphite-ceramic composites with high graphite content, while the third region uses composites with lower graphite content or pure metal/ceramic, creating a multi-material system that balances thermal conductivity with mechanical properties.
2Temperature
If graphite content is increased to improve heat dissipation, then thermal conductivity improves, but structural strength decreases
Solution Approach 1:
The patent resolves this contradiction by applying local quality: the first region (overlapping light sources) contains 70-100 vol% graphite for maximum thermal conductivity, the second region contains 30-70 vol% graphite for intermediate properties, and the third region contains 0-30 vol% graphite or pure metal/ceramic for high structural strength. This spatial differentiation allows the structure to simultaneously achieve excellent heat dissipation where needed and maintain structural integrity where required.
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 substrate effectively improves heat dissipation and structural integrity, leading to enhanced performance and reliability of light emitting devices.
Implementation Method 1
The second member includes a first region containing graphite, a second region containing graphite and a thermally conductive material, and a third region containing a thermally conductive material
Data Source
AI summary
A substrate includes a first member having a through hole extending from an upper surface to a lower surface thereof, and a second member disposed inside the through hole. The second member includes a first region containing graphite, a second region located outward of the first region in a top view, containing graphite and a thermally conductive material that contains at least one of a metal or a ceramic, and having a volume fraction of the graphite lower than a volume fraction of the graphite in the first region, and a third region located outward of the second region in the top view, containing a thermally conductive material that contains at least one of a metal or a ceramic, and having a volume fraction of the thermally conductive material higher than a volume fraction of the thermally conductive material in the second region.