Head-Up Display Guide Light Unit Vertical Position Adjustment
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Solution Overview
Problem
Existing head-up display devices struggle to accurately adjust the vertical position of display information and provide a sense of distance, particularly for drivers with varying eye levels, as the virtual image may fall outside the projection area, making it difficult to determine its position and achieve correct alignment.
Innovation Solution
Incorporating a guide light unit with luminous bodies aligned along the optical path of the display light, which are reflected by the reflector and projected onto the window shield, allowing the virtual images of the guide light to travel vertically with the display information, enabling precise adjustment and improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reflector is adjusted to accommodate drivers with varying eye levels, then the virtual image can be viewed by different drivers, but the virtual image may fall outside the projection area making it difficult to determine its position
Solution Approach 1:
A guide light unit is introduced as an intermediary element between the display source and the driver's eyes. The guide light includes a light source and a light guide member that directs light to form a visible guide line on the window shield. This guide line serves as a reference marker that helps drivers determine the position of the virtual image, especially when the virtual image falls outside the normal projection area due to adjustments for different eye levels.
2Difficulty of detecting and measuring
If the virtual image is displayed at a distance ahead of the driver's eye position, then the driver achieves a sense of distance, but it becomes difficult to accurately adjust the vertical position of the display information
Solution Approach 1:
The guide light unit acts as a mediator that provides a visible reference (guide line) on the window shield. This reference line enables drivers to accurately perceive the vertical position of the virtual image even when it is displayed at a distance ahead of the eye position. The guide line creates a visual benchmark that facilitates precise vertical position adjustment while maintaining the distance effect.
3Illumination intensity
If the guide light is positioned closer to the reflector than the display source, then the virtual images of the guide light are displayed closer to the driver, but the amount of travel of these virtual images is smaller
Solution Approach 1:
The guide light unit is strategically positioned at a specific location within the case, closer to the reflector than the display source. This creates a local quality difference where the guide light has different optical characteristics compared to the main display light. The guide light forms virtual images that are closer to the driver with smaller travel distance, which is sufficient for its purpose of providing a position reference without interfering with the main display function.
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 guide light unit allows for precise vertical adjustment of the display information, ensuring it remains within the projection area, facilitating accurate positioning and enhancing the driver's sense of distance by providing a clear visual reference.
Implementation Method 1
a guide light unit having at least one of a plurality of luminous bodies aligned along an optical path of the display light
Implementation Method 2
a reflector that reflects the display light of display information displayed on the display source toward a window shield side projection area
Data Source
AI summary
The head-up display device sequentially displays a virtual image (51V) of a guide light from one end of a reflector (30) side, in the back inside of a virtual image (83V) of an opening bezel formed into a square frame displayed along an outer edge of a projection area (71) of a window shield, and further displays a virtual image (20V) of display information in the back thereof. The amount of travel of the virtual images (51V) of the guide light when the reflector provided in the head-up display device rotates is smaller than the amount of travel of the virtual image (20V) of the display information. Therefore, even if the virtual image (20V) of the display information falls outside the projection area, the virtual images (51V) of the guide light remain in the projection area, and are displayed.