Head-Up Display Cooling via Vehicle Air Conditioning Duct
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Solution Overview
Problem
Existing head-up display devices face issues with increased size and cost due to the need for a cooling fan, and the direct application of cooling air can lead to dust adherence on the display unit, causing image distortion.
Innovation Solution
A head-up display device design that places the display unit outside the housing case, utilizing a communication passage to channel air from the vehicle's air conditioning system for cooling the control circuit, thereby avoiding the use of a cooling fan and reducing dust adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is provided to cool the control circuit, then the control circuit can be cooled effectively, but the device size and cost increase
Solution Approach 1:
The patent combines the cooling function with the existing housing case structure. The housing case is designed to include a cooling passage that allows air flow from the air conditioning device to cool the control circuit, eliminating the need for a separate cooling fan and motor assembly.
Solution Approach 2:
The housing case serves multiple functions: it provides structural support, houses the control circuit, and acts as a cooling channel for the control circuit by incorporating a cooling passage that directs air flow from the air conditioning device.
2Temperature
If cooling air is directly applied to the display unit, then the display unit can be cooled, but dust adheres to the display unit causing image distortion
Solution Approach 1:
The patent segments the cooling function from the display unit by directing cooling air only to the control circuit through a dedicated cooling passage in the housing case, while the display unit remains outside this cooling air flow path, preventing dust adherence.
Solution Approach 2:
The display unit is extracted from the housing case structure and positioned outside it, separating it from the cooling air flow path that is confined within the housing case to cool the control circuit only.
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 design effectively cools the control circuit without increasing the device size or cost, while minimizing the risk of dust-induced image distortion, ensuring efficient and clear display image projection.
Implementation Method 1
a housing case that receives the control board and has a hollow space, which is in contact with the control board... The housing case includes a communication passage that communicates between: a duct that conducts air, which is blown from an air conditioning device of the vehicle toward a vehicle cabin; and the hollow space
Data Source
AI summary
A head-up display device includes a display unit that projects a display image to a windshield of a vehicle; a control board that has a control circuit, which controls the display unit; and a housing case that receives the control board and has a hollow space, which is in contact with the control board. The display unit is placed at an outside of the housing case. The housing case includes a communication passage that communicates between a duct and the hollow space while the duct conducts air, which is blown from an air conditioning device of the vehicle toward a vehicle cabin.