Gradient Reflective Layer for Laser Projection Heat Management
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Solution Overview
Problem
Current wavelength conversion devices in projection systems face issues with heat dissipation and conversion efficiency due to the use of colloidal reflective layers with low thermal conductivity, leading to thermal resistance and potential deterioration or burnout, especially when excited by high-energy blue laser diodes.
Innovation Solution
A wavelength conversion device with a reflective layer having varying thicknesses and concentrations of reflective particles in the radial direction, where regions with stronger excitation beam energy have thinner layers and higher particle concentrations to enhance reflectivity and thermal conductivity, reducing thermal resistance and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a colloid layer mixed with reflective particles is used as the reflective layer to reduce cost, then the cost is reduced, but the thermal conductivity is low and thermal resistance increases
Solution Approach 1:
The patent changes the physical parameters of the reflective layer by using a gradient thickness design where the thickness varies from the center to the edge of the phosphor wheel. This parameter change allows the reflective layer to maintain low thermal resistance while using cost-effective colloid mixed with reflective particles, resolving the contradiction between cost reduction and thermal management.
Solution Approach 2:
The reflective layer is designed with non-uniform thickness distribution, where the thickness is greater at the center and smaller at the edges. This local quality variation optimizes heat dissipation in regions with different thermal loads, allowing the use of lower-cost colloid-based materials while maintaining acceptable thermal performance.
2Illumination intensity
If the thickness of the colloid layer is increased to coat enough reflective particles for better reflectivity, then reflectivity is improved, but heat dissipation becomes slower and thermal resistance increases
Solution Approach 1:
The reflective layer thickness is optimized locally rather than uniformly throughout. The center region has greater thickness to provide sufficient reflectivity, while the edge regions have smaller thickness to facilitate heat dissipation. This local quality differentiation resolves the contradiction between achieving adequate reflectivity and maintaining effective heat dissipation.
Solution Approach 2:
The reflective layer is effectively segmented into different thickness zones (center and edge regions) with distinct functional requirements. The center zone prioritizes reflectivity with greater thickness, while the edge zones prioritize thermal management with smaller thickness, resolving the contradiction through spatial segmentation.
3Reliability
If the phosphor layer absorbs heat without effective dissipation, then the conversion efficiency decreases and deterioration or burnout may happen, but increasing thermal conductivity material may increase cost
Solution Approach 1:
The patent modifies the thickness parameter of the reflective layer to optimize thermal management. By adjusting the thickness distribution, the system achieves improved heat dissipation and conversion efficiency without necessarily increasing the cost of thermal conductivity materials, as the optimization is achieved through geometric configuration rather than material substitution.
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 improves the wavelength conversion efficiency and reliability by effectively managing heat dissipation, preventing efficiency decreases and deterioration, and ensuring the longevity of the wavelength conversion layer.
Implementation Method 1
A reflective layer may be disposed under the phosphor layer of the phosphor wheel to reflect the light excited by the blue light
Implementation Method 2
blue laser diodes are usually used to excite the phosphor on the phosphor wheel to generate yellow light and green light
Data Source
AI summary
The invention provides a wavelength conversion device and a projection device including the same. The wavelength conversion device includes a substrate, a reflective layer, and a wavelength conversion layer. The reflective layer has different thicknesses in a radial direction of the substrate. The invention further provides another wavelength conversion device and another projection device including the same. In the wavelength conversion device, the reflective layer includes a first colloid and reflective particles distributed in the first colloid. The reflective layer includes an inner reflective layer, a central reflective layer and an outer reflective layer. The concentration of the reflective particles in the central reflective layer is different from the concentration of the reflective particles in the inner reflective layer and the concentration of the reflective particles in the outer reflective layer. The invention can improve the heat dissipation of the wavelength conversion layer, and improve the conversion efficiency.