Vehicle Head-Up Display with Adjustable Transmittance Plate
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Solution Overview
Problem
Automotive head-up displays are prone to damage due to high temperatures caused by strong sunlight, which deteriorates their reliability.
Innovation Solution
A head-up display system featuring a casing, control circuit board, display panel, and a plate with adjustable transmittance, where the plate covers the display panel and can reduce transmittance when not in use to prevent sunlight exposure, using a liquid crystal panel that changes its transmittance based on power supply or ambient brightness and temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head-up display is configured around the windshield to project data images, then the visibility and accessibility of displayed information is improved, but the display panel is exposed to strong sunlight which causes high temperature and damages the display panel
Solution Approach 1:
A plate with adjustable transmittance is introduced as an intermediary component between the display panel and the external environment. This plate can dynamically adjust its transmittance level - maintaining high transmittance when visibility is needed and reducing transmittance when sunlight protection is required, thus mediating between the conflicting requirements of visibility and thermal protection
Solution Approach 2:
The system transitions from a static display configuration to a dynamic one where the plate's transmittance can be adjusted in real-time based on environmental conditions and usage state. The control circuit board dynamically controls the plate's transmittance to adapt to changing conditions, such as reducing transmittance when the vehicle is stationary or not in driving mode to prevent overheating
2Reliability
If the transmittance of the plate is reduced to prevent sunlight from illuminating the display panel, then the reliability of the head-up display is improved, but the visibility of the displayed image is reduced
Solution Approach 1:
The plate's transmittance is made dynamically adjustable rather than fixed, allowing the system to optimize the balance between protection and visibility based on real-time conditions. The control circuit board adjusts transmittance according to whether the vehicle is in driving mode, ambient light conditions, and temperature, ensuring high visibility when needed and reliable protection when stationary
Solution Approach 2:
The system changes the transmittance parameter of the plate dynamically based on operational conditions. When the vehicle is not in driving mode or when overheating is detected, the transmittance parameter is reduced to protect the display panel. When driving mode is active and visibility is needed, the transmittance parameter is increased to allow clear viewing of the displayed information
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
Enhances the reliability of the head-up display by preventing overheating and ensuring optimal visibility of displayed data under various lighting conditions.
Implementation Method 1
using a liquid crystal panel that changes its transmittance based on power supply or ambient brightness and temperature sensing
Data Source
AI summary
A head-up display including a casing, a control circuit board, a display panel, and a plate is provided. The control circuit board is disposed in the casing. The display panel is disposed in the casing and electrically connected to the control circuit board. The plate is fixed to the casing and covers the display panel. The transmittance of the plate is capable of being changed, so that an image displayed on the display panel is projected out through the plate, or external light is stopped from illuminating the display panel through the plate. A vehicle having the head-up display and a controlling method of the head-up display are provided as well.