Dynamic Eyebox Correction for Automotive Head-Up Displays
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Solution Overview
Problem
Conventional head-up displays (HUDs) have a fixed eyebox, limiting the driver's ability to view the displayed information unless their eyes are within a small, specific spatial area, restricting movement and comfort while driving.
Innovation Solution
A system that uses a driver-facing camera and sensors to detect the driver's head and eye position, adjusting the optics and projected image to expand or relocate the eyebox, ensuring the display remains visible regardless of posture or seat position, and incorporates three-dimensional effects for enhanced perspective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the eyebox is kept small and fixed to maintain image collimation quality, then the optical precision is improved, but the driver's viewing freedom and comfort deteriorate
Solution Approach 1:
The patent implements dynamic eyebox adjustment by detecting the driver's eye position and actively repositioning the optical components (mirrors or lenses) to maintain the collimated image within the driver's field of view. This transforms the fixed eyebox into a dynamic system that adapts to driver movements, resolving the contradiction between optical precision and viewing freedom
Solution Approach 2:
The system uses eye position detection (via cameras or sensors) to provide feedback about the driver's location relative to the eyebox. This feedback loop enables real-time adjustments to the optical system, ensuring the collimated image remains properly positioned even as the driver moves, thus maintaining both precision and adaptability
2Ease of operation
If the eyebox dimensions are increased to allow more head movement, then the driver's comfort is improved, but the image quality and collimation precision deteriorate
Solution Approach 1:
Rather than statically enlarging the eyebox and sacrificing collimation quality, the system dynamically adjusts the optical components to track the driver's eye position. This maintains a compact optical design with high collimation precision while providing the comfort of increased viewing freedom through active tracking
Solution Approach 2:
The system creates a virtual copy of the collimated image at multiple positions by using adjustable mirrors or lenses to redirect light paths. This allows the image to appear consistently sharp and collimated across a larger effective viewing area without compromising the optical precision of the original collimation system
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
Enables the driver to view the HUD information from various positions and postures, improving comfort and safety by maintaining visibility of critical data without the need to keep eyes within a fixed area, enhancing situational awareness.
Implementation Method 1
At least one mirror is positioned to provide a first reflection of the illuminated images
Implementation Method 2
A windshield is positioned to receive the first reflection and provide a second reflection of the illuminated image such that the second reflection is visible to a driver
Data Source
AI summary
A head up display arrangement for a motor vehicle includes an image source providing illuminated images. At least one mirror is positioned to provide a first reflection of the illuminated images. A windshield is positioned to receive the first reflection and provide a second reflection of the illuminated image such that the second reflection is visible to a driver of the vehicle who has at least one eye within an eyebox defined by the second reflection. An image capturing device captures images of a head of a driver of the motor vehicle. An electronic processor adjusts, based on the captured images of the driver's head, the illuminated images and/or a position of the at least one mirror.