LED Light Source Module Layout for Light Concentration and Heat Dissipation
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Solution Overview
Problem
Existing light source modules for vehicular lighting face challenges in concentrating light emitted from LED chips while effectively dissipating heat and maintaining structural and optical reliability, particularly due to high ambient temperatures and degradation of wavelength conversion materials.
Innovation Solution
A light source module design featuring a light emitting diode package with a substrate, upper and lower electrodes, a wavelength conversion portion, and a heat dissipation pad, where the wavelength conversion portion's dimensions are optimized relative to the heat dissipation pad and electrodes to enhance light concentration and heat dissipation, and an air path is formed along the side surfaces of the heat dissipation pad and electrodes to improve airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the wavelength conversion portion is enlarged to improve light concentration, then light straightness is improved, but heat dissipation performance deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the light emitting diode package: the wavelength conversion portion is optimized for light concentration with specific dimensional ratios (0.7-0.9 times the heat dissipation pad length in the first direction, and 0.6-0.8 times the sum of heat dissipation pad and lower electrodes length in the second direction), while the heat dissipation pad is optimized for thermal management. This spatial differentiation allows each region to perform its specialized function effectively without compromising the other.
2Temperature
If the heat dissipation pad is enlarged to improve heat dissipation, then heat dissipation performance is improved, but light concentration capability deteriorates
Solution Approach 1:
The patent employs asymmetry in the dimensional relationships between components. The wavelength conversion portion is deliberately designed with asymmetric proportions relative to the heat dissipation pad and lower electrodes, with specific ratio ranges (0.7-0.9 times in the first direction, 0.6-0.8 times in the second direction). This asymmetric design allows the wavelength conversion portion to maintain optimal light concentration geometry while the heat dissipation pad provides sufficient thermal management area, resolving the trade-off between these two functions.
3Productivity
If high-intensity light is emitted in a confined space, then lighting efficiency is improved, but ambient temperature increases
Solution Approach 1:
The patent segments the light emitting diode package into functionally distinct regions: a wavelength conversion portion for light generation and concentration, and a heat dissipation pad for thermal management. This segmentation allows the light-emitting region to operate at high intensity for efficient lighting while the separately optimized heat dissipation region effectively manages the generated heat, preventing excessive ambient temperature rise in the confined space.
4Use of energy by moving object
If the wavelength conversion portion is positioned close to the light emitting structure, then optical efficiency is improved, but heat-induced degradation of wavelength conversion material increases
Solution Approach 1:
The patent optimizes the spatial parameters and dimensional ratios between the wavelength conversion portion and the heat dissipation pad (specifically 0.7-0.9 times the heat dissipation pad length in the first direction and 0.6-0.8 times the sum of heat dissipation pad and lower electrodes length in the second direction). These parameter optimizations allow the wavelength conversion portion to be positioned close enough to the light emitting structure for high optical efficiency while the heat dissipation pad's thermal management capability maintains the temperature at levels that prevent degradation of the wavelength conversion material.
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 design improves light straightness, heat dissipation, structural reliability, and optical reliability by preventing degradation of wavelength conversion materials and enhancing adhesion between components, making it suitable for vehicular lighting applications.
Implementation Method 1
a wavelength conversion portion disposed corresponding to a light emitting region on an upper surface of the light emitting structure
Implementation Method 2
a heat dissipation pad disposed on the lower surface of the substrate to be spaced apart from the first and second lower electrodes
Implementation Method 3
an air path (AP) may be formed along side surfaces of the heat dissipation pad and the first and second lower electrodes to allow air to flow along the side surfaces thereof
Data Source
AI summary
A light source module according to the present invention includes a light emitting diode package, which includes a substrate, a first upper electrode and a second upper electrode disposed on an upper surface of the substrate, a light emitting structure disposed on an upper surface of the first upper electrode and electrically connected to the first and second upper electrodes, and a wavelength conversion portion disposed corresponding to a light emitting region on an upper surface of the light emitting structure, a first lower electrode and a second lower electrode disposed on a lower surface of the substrate and electrically connected to the first and second upper electrodes, respectively, and a heat dissipation pad disposed on a lower surface of the substrate to be spaced apart from the first and second lower electrodes.