Vehicle HUD Image Projection Distance and Parallax Control
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Solution Overview
Problem
Conventional heads-up displays (HUDs) in vehicles project images at a distance of about 2 meters, requiring significant eye movement and focus adjustment, leading to increased eye fatigue and reduced ability to quickly recognize details, as well as inadequate depth perception due to convergence motion, making it difficult to effectively provide information to drivers.
Innovation Solution
An information provision system that projects images at a distance of 5 meters or more, using a laser scanning system to display information in a way that reduces eye convergence motion, allowing for improved depth perception and easier recognition of details by controlling the position of images based on the driver's viewpoint and relative distance of detected objects, thereby enhancing the perception of motion parallax.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If images are projected at a distance of about 2 meters in a conventional HUD, then the device complexity is reduced and ease of manufacture is improved, but eye fatigue increases and the ability to quickly recognize details deteriorates due to significant eye movement and focus adjustment required
Solution Approach 1:
The patent transitions from a 2D display plane to a 3D virtual image space by projecting images at distances of 5 meters or more. This creates a virtual image that appears to exist in the driver's forward view rather than on a fixed display surface, reducing eye convergence motion and improving depth perception while maintaining manufacturability through laser scanning technology
2Reliability
If images are projected at a distance of about 2 meters, then the projection system is simpler and easier to manufacture, but depth perception is inadequate due to convergence motion
Solution Approach 1:
The patent changes the key parameter of image projection distance from 2 meters to 5 meters or more. This parameter change fundamentally alters the optical geometry, reducing the convergence angle and minimizing eye movement required to maintain focus, thereby improving depth perception and reducing eye fatigue
3Adaptability or versatility
If the position of images is fixed in a conventional HUD, then the device complexity is reduced, but the ability to adapt to different driving conditions and object distances deteriorates
Solution Approach 1:
The patent implements a dynamic image positioning system that adjusts the virtual image position based on detected object distance and driver viewpoint. The laser scanning system dynamically modifies image coordinates to maintain appropriate perception distance, enabling the display to adapt to varying driving conditions, object distances, and driver head positions
Solution Approach 2:
The system incorporates feedback mechanisms by detecting the driver's viewpoint position and the relative distance of objects, then using this information to adjust the image display position. This closed-loop control ensures the virtual image remains optimally positioned to provide accurate depth perception and reduce eye fatigue across different driving 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
This solution reduces eye fatigue and improves the driver's ability to quickly recognize and understand information, providing clearer depth perception and reducing confusion between multiple instruction sequences by positioning images in a manner that aligns with the driver's natural field of view and sense of distance.
Implementation Method 1
projecting an image light to a light transmission member so as to display a for-driver information image
Implementation Method 2
changing a position at which an object image indicating the object to be detected is displayed according to a result of the detecting so as to change a perception distance of the driver influenced by a motion parallax of the object image according to the relative distance of the object to be detected
Data Source
AI summary
An information provision device and an information provision method. Each of the information provision device and information provision method includes projecting an image light to a light transmission member so as to display a for-driver information image, sensing a relative distance of an object to be detected existing around the mobile object in the direction of travel, detecting a location of a viewpoint of the driver, and changing a position at which an object image indicating the object to be detected is displayed according to a result of the detecting so as to change a perception distance of the driver influenced by a motion parallax of the object image according to the relative distance of the object to be detected in the direction of travel.