Phosphor Wheel Thermal Management in Laser Projection
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Solution Overview
Problem
High-intensity mercury lamps in projection display apparatuses have short lifespans and maintenance issues, and existing solid-state light sources face challenges in effectively cooling phosphor wheels during fluorescence illumination, leading to temperature rise and reduced efficiency.
Innovation Solution
A light source system incorporating a semiconductor laser light source, a phosphor wheel with a heat-receiving section and a heat-dissipation section thermally connected within a compartment, where the heat-receiving section is positioned opposite the fluorescence light output side of the phosphor wheel and the heat-dissipation section is outside the compartment, utilizing heat-absorbing and heat-dissipation paints to manage thermal energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phosphor wheel is hermetically stored in a compartment for solid-state light emission, then the light source reliability is improved, but heat accumulates in the compartment causing phosphor temperature rise and reduced fluorescence efficiency
Solution Approach 1:
The harmful heat is extracted from the compartment by introducing a heat reception plate that absorbs heat from the phosphor wheel and transfers it to the compartment wall, where it is dissipated to the external environment. This separates the heat generation source from the phosphor wheel, maintaining its temperature while preserving the hermetic sealing.
Solution Approach 2:
A heat reception plate is introduced as an intermediary component between the phosphor wheel and the compartment wall. This plate serves as a thermal conduit, absorbing heat from the phosphor wheel and transferring it to the compartment wall for dissipation, thereby protecting the phosphor from direct heat accumulation.
2Temperature
If cooling structures are added to cool the phosphor wheel, then the temperature control is improved, but the device complexity increases
Solution Approach 1:
The cooling function is merged with the existing compartment structure by making the compartment wall itself a heat dissipation component. The heat reception plate is thermally connected to the compartment wall, which naturally dissipates heat to the external environment, eliminating the need for separate active cooling systems.
Solution Approach 2:
The compartment wall serves dual functions: maintaining the hermetic seal and dissipating heat to the external environment. The system uses its own structural components for heat dissipation rather than requiring external cooling devices, achieving self-service cooling.
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 effectively cools the phosphor wheel, preventing temperature rise and maintaining fluorescence conversion efficiency, thus enhancing the reliability and performance of the light source system.
Implementation Method 1
a phosphor wheel that emits fluorescence when excited by the excitation light
Implementation Method 2
a heat-receiving section and a heat-dissipation section that are thermally connected to each other
Implementation Method 3
The heat-dissipation section is outside the compartment
Data Source
AI summary
A light source system includes an excitation light source, a fluorescent plate that emits fluorescence when exposed to the excitation light from the excitation light source, and a compartment storing the fluorescent plate. The compartment has a heat-receiving section and a heat-dissipation section thermally connected to each other. The heat-receiving section is located opposite a fluorescence light output side of the fluorescent plate, in the compartment. The heat-dissipation section is outside the compartment.