Head-Up Display Eye-Position Correction for Vertical Shift Suppression
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Solution Overview
Problem
Existing head-up display systems cause discomfort to users when detecting unintended vertical eye position movements, leading to incorrect image position corrections, especially due to errors in eye position detection algorithms during lateral head or neck movements.
Innovation Solution
A display control device that switches between first and second image correction processing modes, where the second mode corrects image position with a smaller vertical correction amount to minimize discomfort by reducing unnecessary vertical adjustments, and can set the correction amount to zero for vertical eye position changes during lateral movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the eye position detection unit detects vertical eye position changes during lateral head or neck movements, then the image position correction is applied in the vertical direction, but this causes discomfort to the observer who intended to move only in the horizontal direction
Solution Approach 1:
The patent applies different correction strategies to different directional components of eye position changes. Lateral eye position changes are corrected with full correction amounts, while vertical eye position changes are corrected with reduced correction amounts or zero correction amounts, depending on the detection mode. This local differentiation resolves the contradiction by treating horizontal and vertical corrections differently based on their respective impacts on observer comfort.
Solution Approach 2:
The patent dynamically switches between multiple correction modes (first correction mode with full vertical correction, second correction mode with reduced vertical correction, third correction mode with zero vertical correction) based on the detected eye position change characteristics. This dynamic adaptation allows the system to optimize between measurement precision and observer comfort by selecting the appropriate correction strategy for each situation.
2Reliability
If the system applies full correction amount for vertical eye position changes, then the virtual image position is accurately maintained, but unnecessary corrections occur during lateral movements causing discomfort
Solution Approach 1:
The system dynamically adjusts the correction amount applied to vertical eye position changes based on the detected movement pattern. When lateral head or neck movements are detected, the system switches to correction modes that apply reduced or zero vertical correction, preventing unnecessary adjustments that would cause discomfort. When genuine vertical eye movements are detected, the system switches to modes that apply full correction to maintain virtual image position accuracy.
Solution Approach 2:
The patent applies different correction intensities to different directional components of eye position changes. Horizontal eye position changes receive full correction to maintain lateral positioning accuracy, while vertical eye position changes receive reduced or zero correction during lateral movements to avoid discomfort. This local differentiation in correction quality resolves the contradiction between reliability and ease of operation.
3Measurement precision
If the eye position detection algorithm is made more sensitive to detect small movements, then detection precision is improved, but false detection of unintended vertical movements increases
Solution Approach 1:
The patent implements dynamic correction mode switching based on the characteristics of detected eye position changes. When the detection algorithm identifies patterns consistent with lateral head or neck movements (even if they include small vertical components), the system switches to correction modes that reduce or eliminate vertical correction. This dynamic response allows the system to maintain high detection precision while filtering out false vertical movement detections.
Solution Approach 2:
The patent introduces an intermediate processing layer between eye position detection and image correction that analyzes the detected movements and determines the appropriate correction strategy. This intermediary layer evaluates whether detected vertical eye position changes are genuine user intentions or artifacts of lateral movements, and selectively applies correction accordingly. This mediator resolves the contradiction by preventing false corrections while maintaining detection sensitivity.
Data Source
AI summary
Positional correction of an image occurring along with detection of a shift in vertical eye position unintended by the user is suppressed. First image correction corrects the position of an image displayed on a display device based on a vertical eye position and a lateral eye position. Second image correction corrects the position of the image displayed on the display device based on the vertical eye position and the lateral eye position. A second correction amount to the position of the image with respect to the amount of change in the vertical eye position is smaller than a first correction amount to the position of the image with respect to the amount of change in the vertical eye position during the first image correction. A processor switches between the first image correction and the second image correction in accordance with whether a prescribed condition is satisfied.