Independently Controllable LED Package with Segmented Thermal Management
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Solution Overview
Problem
Existing solid state light emitter packages face challenges in enhancing light output quality, efficiency, thermal properties, and controllability, particularly in achieving high color rendering index and efficient thermal management for multiple LEDs on a common submount.
Innovation Solution
The use of multiple independently controllable solid state emitters with different dominant wavelengths, combined with lumiphors, arranged on a common submount and leadframe, allowing for enhanced color mixing and thermal management through a thermally conductive heatsink and anisotropic heat spreader, along with scattering materials for improved light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple solid state emitters with different wavelengths are mounted on a common submount, then light output quality and color rendering index are improved, but thermal management becomes more difficult
Solution Approach 1:
The patent divides the thermal management system into multiple independent thermal pathways, with each solid state emitter having its own thermally conductive heatsink attached to its respective submount. This segmentation allows heat from each emitter to be managed independently, preventing heat accumulation that would occur if multiple emitters shared a common thermal pathway.
Solution Approach 2:
The patent introduces anisotropic heat spreader materials as intermediary components between the emitters and the external environment. These materials have directionally dependent thermal conductivity, allowing efficient heat transfer in specific directions while maintaining thermal isolation in other directions, thus managing heat from multiple emitters without mutual interference.
2Illumination intensity
If independently controllable emitters are used to enhance color mixing, then color rendering index is improved, but device complexity increases
Solution Approach 1:
The patent segments the lighting device into multiple independently controllable emitter modules, each with its own submount and heatsink. This modular segmentation allows each emitter to be controlled independently for optimized color mixing, while the standardized module design keeps individual component complexity low.
Solution Approach 2:
The patent combines multiple emitter modules with different spectral characteristics (UV, blue, green, red) into a single integrated device mounted on a common substrate. This merging of diverse emitter types enables enhanced color rendering and mixing capabilities while maintaining relatively simple individual module designs.
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
This configuration achieves high color rendering index, efficient thermal management, and enhanced light output quality, enabling the production of white light with adjustable color temperatures and improved flux, while minimizing perception of discrete color sources.
Implementation Method 1
a first lumiphor arranged to receive emissions from the fourth solid state emitter and responsively emit a first lumiphor emission spectrum
Implementation Method 2
efficient thermal management through a thermally conductive heatsink and anisotropic heat spreader
Implementation Method 3
scattering materials for improved light distribution
Data Source
AI summary
A light emission package includes multiple colored solid state emitters each having a different non-white dominant wavelength in the visible range, and at least one lumiphor arranged to receive emissions from at least one other solid state emitter, with each emitter arranged on or adjacent to a common submount. The at least one other emitter and lumiphor may be arranged in combination to emit white light. Each emitter is independently controllable, permitting color and/or color temperature of a lighting device to be varied during operation of the device. At least one white emitter may be combined with red, green, and blue LEDs.