Vehicle HUD Viewpoint Tracking for Multi-Distance Virtual Images
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Solution Overview
Problem
Conventional HUD apparatuses fail to adequately consider larger screen information display, such as big data 3D maps and AI predictions, and do not optimize virtual image display positions to reduce driver viewpoint movement and accommodate the increased size of the HUD apparatus.
Innovation Solution
An information display apparatus with a HUD system that detects the driver's viewpoint position and adjusts virtual image display based on this position, incorporating a virtual image optical system to project images at multiple positions, optimizing display according to the driver's movement and the vehicle's speed and stopping distance, using a concave mirror and aberration correction to ensure clear images at varying distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the HUD apparatus is downsized to be disposed between the steering wheel and the windshield, then the installation space is optimized, but the ability to display information at multiple virtual image positions is compromised
Solution Approach 1:
The patent implements a nested optical system where a second optical system is disposed within the optical path of the first optical system. This allows multiple virtual image positions to be achieved through a compact, nested configuration rather than requiring separate, bulky optical systems for each function.
Solution Approach 2:
The patent uses a variable focus lens that can change its focal length dynamically, adding a temporal dimension to the optical system. This allows the same physical apparatus to project virtual images at multiple different distances by changing the lens focal length, effectively achieving multi-position display capability without increasing physical volume.
2Device complexity
If the virtual image display position is fixed, then the optical system structure is simplified, but the driver's viewpoint movement causes recognition difficulty
Solution Approach 1:
The patent employs a variable focus lens that can dynamically adjust its focal length based on the driver's viewpoint position. This dynamic adjustment capability allows the virtual image distance to be optimized in real-time, maintaining clear recognition without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The system uses a viewpoint detection unit to detect the driver's eye position and provides feedback to the control unit, which then adjusts the variable focus lens accordingly. This closed-loop feedback mechanism ensures the virtual image is always positioned at an optimal distance for the driver's current viewpoint, improving recognition ease while keeping the optical structure relatively simple.
3Loss of information
If larger screen information display is implemented for big data and AI information, then the information display capability is enhanced, but the HUD apparatus volume increases
Solution Approach 1:
The patent utilizes the focal length dimension to achieve both large screen display and compact apparatus volume. By varying the focal length of the lens, the system can project large virtual images at different distances, effectively using the optical dimension to resolve the contradiction between display size and apparatus size.
Solution Approach 2:
The nested configuration of the first and second optical systems allows the HUD to maintain enhanced information display capability while keeping the overall apparatus volume compact. The nested structure enables multiple functions to be integrated in a space-efficient manner.
4Adaptability or versatility
If the virtual image is formed at multiple positions, then the driver's viewpoint movement is accommodated, but the optical system becomes more complex
Solution Approach 1:
The variable focus lens serves multiple functions: it enables the formation of virtual images at multiple positions, adjusts for driver's viewpoint movement, and maintains image quality across different focal lengths. This single component performs what would traditionally require multiple separate optical systems, reducing overall complexity.
Solution Approach 2:
The dynamic focal length adjustment capability of the variable focus lens allows the system to adapt to different viewing conditions without requiring complex mechanical adjustment mechanisms. The lens can change its optical properties on-demand, providing multi-position capability through a relatively simple and compact design.
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 solution reduces driver viewpoint movement, enhances safety by displaying alerts farther than the stopping distance, and addresses the issue of HUD apparatus size by optimizing the display position and reducing the physical volume of the system.
Implementation Method 1
a virtual image optical system configured to display a virtual image of the image information in front of the own vehicle by reflecting light emitted from the HUD apparatus to display the image information by the windshield
Implementation Method 2
a variable focus lens configured to vary a focal length in accordance with a viewpoint position of the driver
Implementation Method 3
reflecting light emitted from the HUD apparatus to display the image information by the windshield
Data Source
AI summary
An information display apparatus capable of reducing the viewpoint movement of a driver and achieving safer driving in consideration of the relationship between the traveling speed and the stopping distance of a vehicle is provided. The information display apparatus is configured to display image information in a transportation and comprises a HUD apparatus disposed between a windshield of the transportation and an instrument panel of the transportation. The HUD apparatus detects a viewpoint position of a driver; and displays a virtual image of the image information in front of the transportation by reflecting light emitted from the HUD apparatus to display the image information by the windshield. The HUD apparatus is configured to set a display position of the virtual image in accordance with movement of the viewpoint position of the driver who is driving the transportation.