Optical Engine Heat-Dissipating Module for Projection Apparatus
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Solution Overview
Problem
Digital light processing projection apparatuses face challenges in dissipating heat generated by the color wheel and phosphor powder, leading to reduced optical efficiency and potential dust accumulation due to enclosed spaces.
Innovation Solution
An optical engine module with a first casing containing a phosphor wheel and a cooling fan, where the heat-dissipating module includes a first heat-dissipating part inside the casing and a second heat-dissipating part outside, connected via a heat-guiding part, with the phosphor wheel positioned between the airflow outlet and the first heat-dissipating part to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the color wheel is disposed in an enclosed space to prevent dust deposition, then dustproof performance is improved, but heat dissipation deteriorates
Solution Approach 1:
The enclosed space is segmented into a dustproof enclosed region and a heat dissipation channel. The color wheel assembly is isolated in the enclosed space while the heat dissipation module extends outside, separating the dust protection function from the heat dissipation function through spatial segmentation.
Solution Approach 2:
The heat dissipation module acts as an intermediary between the enclosed space and the external environment. It provides a thermal conduction path that allows heat to escape from the enclosed space without compromising the dustproof seal, mediating between the conflicting requirements of enclosure and heat dissipation.
2Productivity
If high energy light beam is used to improve projection efficiency, then optical converting efficiency is improved, but heat generation increases causing overheating of phosphor powder
Solution Approach 1:
The heat dissipation module extracts heat from the phosphor powder and color wheel assembly. By providing a dedicated heat conduction path that extends outside the enclosed space, the harmful thermal energy is removed from the system, allowing high-energy light beams to be used without causing phosphor powder overheating.
3Duration of action of moving object
If motor of color wheel operates continuously to maintain projection function, then projection function is maintained, but heat accumulation increases affecting optical efficiency
Solution Approach 1:
The heat dissipation module provides continuous heat removal that matches the continuous operation of the color wheel motor. The thermal conduction path ensures that heat is constantly extracted during operation, preventing heat accumulation and maintaining optimal optical efficiency throughout continuous use.
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 reduces the air temperature in the enclosed space by 20°C, lowers the phosphor powder temperature by 30°C, and improves frame luminance by 5%, while reducing the temperature of the light sensor and motor by 15°C, thereby enhancing heat-dissipating efficiency.
Implementation Method 1
a cooling fan is disposed in the first enclosed space and has an airflow outlet
Implementation Method 2
the heat-guiding part is connected between the first heat-dissipating part and the second heat-dissipating part
Data Source
AI summary
An optical engine module includes a first casing with a first enclosed space, a light source at the first casing, a phosphor wheel in the first casing, a cooling fan and a heat-dissipating module. The light source emits a light beam passing through the phosphor wheel. The cooling fan is in the first enclosed space and has an airflow outlet. The heat-dissipating module includes two heat-dissipating parts and a heat-guiding part, wherein the first and second heat-dissipating parts are respectively in and outside the first enclosed space, the heat-guiding part is connected between the first and second heat-dissipating parts and the phosphor wheel is between the airflow outlet and the first heat-dissipating part. The airflow outlet and the phosphor wheel, and the phosphor wheel and the first heat-dissipating part, are at least partially overlapped with each other along the airflow exiting direction of the cooling fan.