Vehicle HUD Virtual Image Positioning Dynamics
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Solution Overview
Problem
Conventional head-up display (HUD) systems in vehicles require longer focus adjustment times for drivers, leading to eye fatigue and reduced visibility of information due to the distance of the virtual image from the driver, which affects the noticeability and effectiveness of information display.
Innovation Solution
An automotive HUD system with a display unit that projects images at a distance of 4 meters or more from the driver, utilizing red, green, and blue laser light sources, collimator lenses, dichroic mirrors, and an optical scanning device to create a virtual image that reduces eye movement and focus adjustment time, while allowing for high luminance and complete blocking of non-image light to maintain landscape visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display position of the information providing image is changed slowly, then the occupant will not notice the change, but the time required to achieve the purpose of changing the display position increases
Solution Approach 1:
The patent applies dynamics by making the changing rate of the display position variable rather than fixed. The control unit adjusts the changing rate dynamically based on the moving velocity of the moving body, allowing the system to adapt between different operational conditions to balance noticeability and response time
Solution Approach 2:
The patent changes the parameter of changing rate based on the moving velocity condition. When the moving body is stationary or moving slowly, a slower changing rate is used to maintain noticeability. When the moving body moves at high velocity, a faster changing rate is applied to achieve the display position change purpose more quickly
2Area of stationary object
If the virtual image is displayed at a distance from the driver, then landscape visibility is improved, but focus adjustment time increases and eye fatigue occurs
Solution Approach 1:
The optical scanning device dynamically adjusts the display distance of the virtual image based on the moving velocity of the moving body. At high velocities, the virtual image is displayed at a greater distance to match the driver's natural viewing behavior and reduce focus adjustment. At low velocities, the display distance is reduced to minimize eye fatigue while maintaining adequate landscape visibility
Solution Approach 2:
The patent changes the display distance parameter of the virtual image according to the moving velocity condition, optimizing the balance between landscape visibility and driver comfort for different operating scenarios
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 system shortens focus adjustment time, reduces eye fatigue, and enhances the driver's ability to quickly perceive information, improving the visibility and noticeability of virtual images by minimizing eye movement and maintaining clear landscape viewability.
Implementation Method 1
utilizing red, green, and blue laser light sources
Implementation Method 2
collimator lenses
Implementation Method 3
dichroic mirrors
Implementation Method 4
an optical scanning device to create a virtual image
Data Source
AI summary
An information providing apparatus installed in a moving body includes one or more processors, and a memory, the memory storing instructions, which when executed by the one or more processors, cause the one or more processors to display, by a display unit, an information providing image as a virtual image, and control the display unit to change a display position of the information providing image. The information providing image includes a first information providing image and a second information providing image, and the display unit is controlled such that a changing rate of a display position of the first information providing image differs from that of a display position of the second information providing image, and the changing rates of the display positions of the first and the second information providing images both increase as a moving velocity of the moving body increases.