Projection Display Cooling Section Shifted from Airflow Path
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Solution Overview
Problem
Short-focus projectors face inefficiencies in cooling, particularly due to high heating values in the light conversion section, which are not adequately addressed by existing cooling methods.
Innovation Solution
A projection display apparatus is designed with the light source and light conversion sections positioned on an airflow path within the casing, while the cooling section is strategically placed outside this path, reducing pressure loss and enhancing heat extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling section is disposed on the airflow path, then the cooling effect is enhanced, but the pressure loss increases
Solution Approach 1:
The cooling section is moved from the airflow path (1D linear path) to a position shifted from the airflow path, utilizing spatial dimensionality change. This allows the cooling section to extract heat from the light conversion section without being part of the main airflow path, thereby reducing pressure loss while maintaining cooling effectiveness through thermal conduction and convection.
2Volume of moving object
If the light source section and light conversion section are disposed close together, then the device size is reduced, but the heat accumulation increases
Solution Approach 1:
The airflow path acts as an intermediary medium between the light source section and light conversion section. By positioning both heat-generating components on the airflow path, the moving air serves as a heat transfer medium that carries heat away from both sections, enabling close positioning without excessive heat accumulation.
Solution Approach 2:
The patent utilizes pneumatic cooling by introducing air flow through the housing. The air flow path is designed to pass through or near the light source section and light conversion section, using the kinetic energy of moving air to remove heat from these components, thus managing heat accumulation in a compact configuration.
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 cooling efficiency by reducing pressure loss and effectively exhausting heat from the light conversion section, addressing the inefficiencies in existing cooling systems.
Implementation Method 1
a cooling section that cools the light conversion section
Implementation Method 2
an air inlet and an air outlet that form an airflow path in a linear shape
Implementation Method 3
extracts white light as fluorescence by irradiating a phosphor with light from the light source section such as a laser diode
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A projection display apparatus according to an embodiment of the present disclosure includes: a light source optical system including a light source section, a light conversion section that converts light emitted from the light source section to light having a wavelength band different from a wavelength band of the emitted light, and a cooling section that cools the light conversion section; and an external casing that houses the light source optical system and has an air inlet and an air outlet that form an airflow path in a linear shape. The light source section and the light conversion section are disposed on the airflow path, and the cooling section is disposed at a position shifted from the airflow path.