Integrated Light and Thermal Guide for LED Cooling
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Solution Overview
Problem
Existing LED lighting solutions face challenges in achieving both optical and electrical efficiency while maintaining device lifetime and manufacturing costs, due to the inherent point source nature of LEDs and the need for low-temperature operation, which is often addressed by complex and costly solutions like fans and thermal sinks that compromise efficiency and form factor.
Innovation Solution
The integration of a light source with a flared or closed light guide and an external thermal guide, which optically couples light for distribution and provides thermal conduction for cooling, allowing for efficient light transport and heat dissipation without adding complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional thermal management solutions (fans, thermal sinks, heat pipes) are used to cool LEDs, then the LEDs can operate at low temperatures, but the device complexity and cost increase
Solution Approach 1:
The patent combines the light guide and thermal guide into a single integrated structure. The light guide serves dual functions: guiding light from the LED while simultaneously acting as a thermal management system through its flared geometry that conducts heat away from the LED. This merging eliminates the need for separate thermal management components, resolving the contradiction between temperature control and device complexity.
Solution Approach 2:
The light guide is designed to perform multiple functions: optical guidance of light from the LED and thermal conduction to dissipate heat. By making the light guide universal for both optical and thermal management, the patent reduces the number of components needed while maintaining effective cooling, thus addressing the contradiction between temperature control and system complexity.
2Temperature
If traditional thermal management solutions are used, then LEDs can be cooled effectively, but manufacturing cost and failure modes increase
Solution Approach 1:
The integration of thermal management functionality into the existing light guide structure eliminates the need for additional thermal management components. This reduces the number of parts that need to be manufactured, assembled, and tested, thereby lowering manufacturing costs and reducing potential failure modes associated with multiple components.
Solution Approach 2:
The light guide serves dual purposes as both an optical component and a thermal management device. This multi-functionality reduces the total component count and simplifies the manufacturing process, as the same component that is already required for light guidance is also used for heat dissipation, reducing overall manufacturing complexity and cost.
3Temperature
If traditional thermal management solutions are used, then LEDs can operate at low temperatures, but the form factor and light distribution are compromised
Solution Approach 1:
The patent merges the thermal management function into the light guide structure, utilizing the light guide's existing flared geometry to conduct heat. This approach maintains a compact form factor because no additional thermal management components are added, and the light distribution is preserved since the light guide's optical properties are maintained while it simultaneously performs thermal conduction.
4Temperature
If traditional thermal management solutions are used, then LEDs can be cooled, but optical efficiency is reduced
Solution Approach 1:
The light guide is designed to perform both optical guidance and thermal conduction without compromising either function. The flared geometry and material properties are optimized to maintain high optical efficiency while effectively conducting heat away from the LED, thus resolving the contradiction between temperature control and optical efficiency by making the light guide multi-functional.
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 solution enhances optical and electrical efficiency while extending device lifetime by effectively managing heat and light distribution, offering a cost-effective and simplified design for LED lighting applications.
Implementation Method 1
The light guide is in communication to the light source for receiving and distributing light from the light source, and the light is transported within the light guide until the light exits from the first or second surface
Implementation Method 2
The thermal guide is coupled to the light section external to the light guide for providing thermal conduction from the light source for cooling the light
Data Source
AI summary
A solid state area light and spotlight having a solid state light source such as LEDs, tapered light guides, and external thermal guides. The area light includes a flared light guide, and the spotlight includes a light guide with a closed end. The light guides are coupled to the light source for receiving and distributing light from the light source with the distribution being based in part upon the shape and taper of the light guides. The thermal guide provides for thermal conduction from the light source and dissipating heat through convection and radiation for cooling the light.