Stationary Wavelength Conversion Module Liquid Cooling
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Solution Overview
Problem
Current projection devices using phosphor wheels with silicone-based wavelength conversion layers face issues with heat resistance and reliability due to high temperatures generated by laser light sources, leading to decreased luminous efficiency and increased noise and cost from large motor requirements.
Innovation Solution
A wavelength conversion module with a case that includes a liquid inlet, outlet, and cavity for cooling liquid circulation, allowing the cooling liquid to effectively carry away heat generated by the wavelength conversion layer, maintaining a stable operating temperature and eliminating the need for a large-diameter actuator, thus reducing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a laser light source is used to excite phosphor in a phosphor wheel, then luminous efficiency is improved, but heat resistance and reliability deteriorate due to high temperatures causing silicone deterioration
Solution Approach 1:
The patent extracts the wavelength conversion layer from the rotating phosphor wheel structure and places it on a stationary case. This separates the heat generation source (laser excitation) from the problematic silicone-based phosphor material, allowing independent optimization of cooling for the laser and stable operation for the wavelength conversion layer.
Solution Approach 2:
The patent introduces a stationary case as an intermediary structure between the laser light source and the wavelength conversion layer. This case provides a stable mounting platform and integrated cooling system, mediating the thermal management between the high-power laser and the heat-sensitive phosphor material.
2Temperature
If the phosphor wheel rotates to increase light receiving area for heat dissipation, then temperature control is improved, but device complexity and cost increase due to larger motor requirements
Solution Approach 1:
Instead of rotating the phosphor wheel to achieve heat dissipation through increased light receiving area, the patent inverts the approach by making the wavelength conversion layer stationary and using a liquid cooling system to remove heat directly from the case where the layer is mounted.
Solution Approach 2:
The patent employs a liquid cooling system with cooling liquid circulating through the case to remove heat from the wavelength conversion layer. This hydraulic cooling approach replaces the mechanical rotation method, providing more efficient and direct heat removal without requiring large motors.
3Temperature
If the phosphor wheel rotates at high speed for cooling, then heat dissipation is improved, but noise and vibration increase
Solution Approach 1:
The patent replaces the mechanical rotation system with a liquid cooling system. Instead of using mechanical motion (rotation) to achieve heat dissipation, the system uses fluid flow to transfer heat away from the wavelength conversion layer, eliminating the noise and vibration associated with high-speed mechanical rotation.
4Adaptability or versatility
If a rotating phosphor wheel structure is used, then wavelength conversion is achieved, but manufacturing precision deteriorates due to alignment issues between rotating components and excitation light
Solution Approach 1:
The patent inverts the conventional approach by making the wavelength conversion layer stationary rather than rotating. This eliminates the dynamic alignment issues between rotating components and the excitation light path, as the relative positions remain constant throughout operation.
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
The solution enhances the reliability and luminous efficiency of the projection device by maintaining a stable temperature and reducing system noise and cost through effective heat management and fixed module positioning.
Implementation Method 1
The case has a liquid inlet, a liquid outlet, and a cavity connecting the liquid inlet and the liquid outlet for circulation of a cooling liquid
Implementation Method 2
for circulation of a cooling liquid
Implementation Method 3
a wavelength conversion layer
Data Source
AI summary
A wavelength conversion module and a projection device are provided. The projection device includes an illumination system providing an illumination light, a light valve forming the illumination light into an image light, and a projection lens forming the image light into a projection light. The illumination system includes an excitation light source providing an excitation light, and a wavelength conversion module receiving the excitation light. The wavelength conversion module includes a case and a wavelength conversion layer. The case has a liquid inlet, a liquid outlet, and a cavity connecting the liquid inlet and the liquid outlet for circulation of a cooling liquid. The wavelength conversion layer is located on the case, wherein the relative positions of the wavelength conversion layer and the excitation light remain unchanged. The projection device and the wavelength conversion module have good reliability.