Wavelength Conversion Element Heat Dissipation via Intermediary Substrate
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Solution Overview
Problem
Conventional wavelength conversion elements in projectors suffer from thermal degradation due to low thermal conductivity of the phosphor layer, leading to reduced light conversion efficiency as heat energy accumulates on the upper surface.
Innovation Solution
Incorporating a heat conduction and diffusion substrate with higher thermal conductivity than the wavelength conversion layer, positioned between the substrate and the wavelength conversion layer, to effectively dissipate heat energy generated by the wavelength conversion layer, while also using microstructures on the substrate surface to enhance thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the excitation light beam is irradiated on the upper surface of the phosphor layer, then the wavelength conversion can be achieved, but heat energy is easily generated and accumulated on the upper surface of the phosphor layer
Solution Approach 1:
A heat conduction and diffusion substrate is introduced as an intermediary component between the phosphor layer and the heat dissipation substrate. This substrate has higher thermal conductivity than the phosphor layer and is configured to receive heat from the phosphor layer's upper surface and conduct it to the heat dissipation substrate, effectively mediating heat transfer and reducing temperature accumulation in the phosphor layer.
Solution Approach 2:
The heat dissipation path is segmented into multiple stages: the phosphor layer generates heat, the heat conduction and diffusion substrate receives and redistributes the heat, and the heat dissipation substrate dissipates it. This segmentation allows each component to optimize its function, with the heat conduction and diffusion substrate specifically addressing the heat accumulation problem at the phosphor layer's upper surface.
2Reliability
If the thermal conductivity of the phosphor layer is low, then the phosphor layer can maintain its optical properties, but laser heat is easily accumulated on the upper surface of the phosphor layer
Solution Approach 1:
The heat conduction and diffusion substrate serves as a mediator that receives heat from the phosphor layer without requiring the phosphor layer itself to have high thermal conductivity. This allows the phosphor layer to maintain its optical properties while the intermediary substrate handles the heat management function.
Solution Approach 2:
The heat conduction function is substituted from the phosphor layer to a dedicated heat conduction and diffusion substrate. This separation allows the phosphor layer to focus on its primary function of wavelength conversion while the substrate handles thermal management, replacing the need for the phosphor layer to simultaneously perform both functions.
3Reliability
If a heat conduction and diffusion substrate is added to improve heat dissipation, then thermal degradation is reduced, but the device structure becomes more complex
Solution Approach 1:
The heat conduction and diffusion substrate is designed to perform multiple functions: it conducts heat from the phosphor layer, diffuses heat to reduce hot spots, and interfaces with the heat dissipation substrate. This multi-functionality justifies the additional component by consolidating several thermal management functions into a single element.
Solution Approach 2:
The key parameter of the heat conduction and diffusion substrate is its thermal conductivity, which is specifically chosen to be higher than that of the phosphor layer. By changing this parameter, the substrate effectively addresses the heat accumulation problem without requiring fundamental redesigns of other components.
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 reduces the temperature of the wavelength conversion layer, mitigates thermal degradation, and improves light energy conversion efficiency, resulting in stable image quality and enhanced projection performance.
Implementation Method 1
heat energy generated by the wavelength conversion layer is conducted to the substrate through the heat conduction and diffusion substrate
Implementation Method 2
The wavelength conversion layer is configured to receive and convert the excitation light beam into a converted light beam
Implementation Method 3
The reflective layer is configured to reflect the converted light beam
Data Source
AI summary
A wavelength conversion element including a substrate, a wavelength conversion layer, a reflective layer, and a heat conduction and diffusion substrate is provided. The reflective layer is disposed between the substrate and the wavelength conversion layer, and the wavelength conversion layer is disposed between the heat conduction and diffusion substrate and the reflective layer. The wavelength conversion element is configured to receive an excitation light beam. The heat conduction and diffusion substrate is configured to allow the excitation light beam to pass through. The wavelength conversion layer is configured to receive and convert the excitation light beam into a converted light beam. The reflective layer is configured to reflect the converted light beam, and the heat conduction and diffusion substrate is configured to allow the converted light beam to pass through.