Head-Up Display Eyebox Tracking to Prevent Wobble and Flicker
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Solution Overview
Problem
Existing head-up display systems experience undesired wobbling and flickering due to rapid head and eye movements during vehicle operation, particularly when tracking eye positions using camera-based methods without adequate filtering or postprocessing.
Innovation Solution
Implement a method that includes predetermined ignoring criteria and exceptional circumstances to filter out irrelevant eye and head movements, using a low-pass filter when necessary, to ensure robust and continuous adaptation of the eyebox to user positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If camera-based eye position tracking is implemented without filtering, then the eyebox can be continuously adapted to eye movements, but the display exhibits wobbling and flickering due to rapid head movements
Solution Approach 1:
The patent applies preliminary action by implementing a low-pass filter before the eyebox position is updated. The filter pre-processes the raw eye position data to remove high-frequency components caused by rapid head movements, ensuring that only stable and relevant eye position changes are used for eyebox adaptation. This prevents the display from reacting to transient movements that would cause wobbling and flickering.
Solution Approach 2:
The patent introduces an intermediary element - a low-pass filter - between the camera-based eye position detection and the eyebox adaptation mechanism. This intermediary processes the raw eye position signals, filtering out noise and rapid movements, and provides smoothed position data to the eyebox control system. This mediator resolves the contradiction by allowing continuous adaptation while maintaining display stability.
2Stability of the object's composition
If manual settings are used for eyebox position, then display stability is maintained, but user comfort decreases due to inability to adapt to varying eye positions
Solution Approach 1:
The patent implements self-service by enabling the eyebox to automatically track and adapt to the user's eye position through camera-based detection and low-pass filtering. The system serves itself by continuously monitoring eye movements and adjusting the eyebox position without requiring manual intervention. This maintains display stability while significantly improving user comfort and ease of operation.
3Adaptability or versatility
If rapid eye position tracking is implemented, then adaptability to eye movements is improved, but display quality deteriorates due to wobbling and flickering
Solution Approach 1:
The patent applies preliminary action by filtering eye position data before it is used to update the eyebox position. The low-pass filter pre-processes the tracking data to eliminate high-frequency noise and rapid movements, ensuring that only stable and meaningful eye position changes trigger eyebox adjustments. This maintains tracking responsiveness while preventing display quality deterioration from wobbling and flickering.
Solution Approach 2:
The patent introduces a low-pass filter as an intermediary between the eye position tracking system and the eyebox control system. This intermediary smooths the tracking signals, allowing the system to respond to genuine eye movements while ignoring transient head movements. The result is maintained adaptability without the harmful effects on display quality.
Data Source
AI summary
A method for robust adaptation of a device that is automatically trackable to a varying eye position of a user of the device for use in a vehicle, the method including ascertaining a current change in the eye position of the user, returning to ascertaining a change in the eye position if at least one of predetermined ignoring criteria that classifies the currently ascertained change as irrelevant is satisfied and none of predetermined exceptional circumstances that classify tracking as necessary is satisfied, and tracking the device according to the currently ascertained change in the eye position if none of the predetermined ignoring criteria is satisfied or if at least one of the predetermined exceptional circumstances is satisfied.