Projection Display Device Sealed Housing Cooling
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Solution Overview
Problem
Existing projection image display devices face challenges in effectively cooling heat-generating components while preventing dust and moisture ingress, which can degrade image quality and cause salt damage, especially in environments where water or salt is present.
Innovation Solution
A sealed projection image display device design featuring a first housing for the light source and image display element, a second housing with intake and exhaust ports, and separate heat exchangers for each component to transfer heat to outside air, using blowers to manage airflow and maintain a sealed environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If outside air is taken into the projection image display device for cooling heat-generating components, then cooling effectiveness is improved, but dust and waste flow into the device together with the outside air
Solution Approach 1:
The device is divided into a sealed first space containing the light source and image display element, and a second space between the first housing and second housing that serves as a cooling chamber. This segmentation allows the optical components to be protected in a sealed environment while still enabling heat dissipation through the separate cooling space with heat exchangers.
Solution Approach 2:
Heat exchangers are introduced as intermediary components that transfer heat from the sealed first space to the outside air through the second space. The heat exchangers act as mediators that enable thermal energy transfer without requiring direct contact between the sealed optical components and the outside air, thus preventing dust ingress while maintaining cooling effectiveness.
2Object-affected harmful factors
If a dustproof filter is provided at the inlet of outside air to suppress dust and refuse inflow, then dust protection is improved, but maintenance such as periodic replacement or cleaning of the dustproof filter is required
Solution Approach 1:
The dustproof filter is extracted from the air intake path and replaced by a sealed housing structure. The first housing completely seals the light source and image display element, eliminating the need for filters in the air intake path. This extraction of the filtering function and replacement with a sealed structure removes the maintenance burden associated with filter replacement while maintaining dust protection.
3Object-affected harmful factors
If a sealed structure is used to prevent dust and moisture ingress, then protection against harmful factors is improved, but the light source cannot be included in the sealed structure in existing designs
Solution Approach 1:
The housing is segmented into a first sealed space containing the light source and image display element, and a second cooling space between the housings. This segmentation allows the light source to be included in the sealed structure while maintaining protection against dust and moisture, as the seal is formed by the first housing that completely encloses the optical components.
Solution Approach 2:
Heat exchangers serve as intermediaries that enable thermal coupling between the sealed first space and the external environment without compromising the seal. The heat exchangers transfer heat from the light source and image display element through the sealed housing walls, allowing the light source to be fully enclosed while still achieving effective cooling and environmental protection.
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 device efficiently cools heat-generating components while preventing dust and moisture ingress, ensuring reliable operation in various environments, including outdoor conditions.
Implementation Method 1
a first heat exchanger that is disposed in the second space and transfers heat of the image display element to outside air in the second space
Implementation Method 2
transfers heat of the image display element to outside air in the second space
Implementation Method 3
a second heat exchanger that is disposed in the second space and transfers heat of the light source to outside air in the second space
Implementation Method 4
transfers heat of the light source to outside air in the second space
Implementation Method 5
a first blower that is disposed in the second space, takes outside air into the second space through the intake port, and discharges the outside air in the second space through the exhaust port
Data Source
AI summary
A projection image display device according to the present disclosure includes a light source and an image display element on which light from the light source is incident, a first housing that houses the light source and the image display element and forms a sealed first space, a second housing that houses the first housing, forms a second space therebetween, and includes an intake port and an exhaust port for outside air, a first heat exchanger disposed in the second space that transfers heat of the image display element to outside air in the second space, a second heat exchanger disposed in the second space that transfers heat of the light source to outside air in the second space, and a first blower disposed in the second space, that takes outside air into the second space through the intake port, and discharges it through the exhaust port.