Reflective Image Display Cooling Path Outside the Optical Path
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Solution Overview
Problem
Existing cooling methods for reflective image displays in projection display apparatuses, such as those using heat sinks or liquid cooling devices, are insufficient in achieving efficient cooling due to limited heat conduction and potential dust accumulation, particularly on the light incident side, which restricts the luminance of projected images.
Innovation Solution
A projection display apparatus with a cooling device that includes a first heat receiving unit with a rectangular opening, a pump for liquid refrigerant, and a heat dissipation part, where the refrigerant flows through a flow path connected to the image display element via heat conductive members, ensuring efficient heat transfer and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a refrigerant flow path is disposed between the image display and the prism to cool the image display, then cooling efficiency is improved, but dust adheres to the optical path effective area and heat conduction efficiency is limited when refrigerant is air
Solution Approach 1:
The patent extracts the refrigerant flow path from the optical path by positioning it on the side surface of the image display element rather than between the image display and the prism. This separation removes the harmful effect of dust adhesion to the optical path while maintaining effective cooling of the image display element through the side-mounted flow path that contacts the side surface and back surface.
2Temperature
If a pipe tube through which liquid refrigerant flows is disposed between the image display and the prism, then cooling efficiency is improved, but the structure becomes complex and occupies space in the optical path
Solution Approach 1:
The patent moves the refrigerant flow path from the optical path (between image display and prism) to a side dimension (on the side surface of the image display element). This dimensional relocation allows the flow path to be integrated into the side structure rather than occupying space in the optical path, reducing structural complexity while maintaining cooling efficiency.
3Length of stationary object
If the distance from the light incident side to the optical member is short, then the projection display apparatus has a compact structure, but cooling performance on the light incident side is insufficient
Solution Approach 1:
The patent segments the cooling approach into two parts: a flow path on the side surface that contacts the side surface and back surface, and a flow path on the back surface. This segmentation allows effective cooling of the light incident side without increasing the distance from the light incident side to the optical member, as the side-mounted flow path directly contacts the side surface where heat generation occurs.
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 apparatus achieves improved cooling efficiency by effectively dissipating heat from both sides of the image display element, maintaining reliability and enhancing the luminance of projected images.
Implementation Method 1
the flow path part of the first heat receiving unit is in contact with the first side face and the second front face of the image display element via a heat conductive member
Implementation Method 2
a pump that feeds a refrigerant that is liquid to the first heat receiving unit
Implementation Method 3
a heat dissipation part that dissipates heat received by the refrigerant
Data Source
AI summary
A cooling device of a projection display apparatus includes a first heat receiving unit including an opening that is rectangular. The first heat receiving unit includes a flow path part that forms the opening. An image display element of the projection display apparatus includes a first front face located in front of a reflective image display, a second front face parallel to the first front face and located behind and outside the first front face, and a first side face located between the first front face and the second front face. The first front face is inserted into the opening, and the flow path part is in contact with the first side face and the second front face via a heat conductive member. The flow path part includes a front face that is flush with or in front of the first front face of the image display element.