Vehicle Virtual Image Display Attitude Compensation
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Solution Overview
Problem
Conventional head-up display devices interrupt the display of virtual images when a vehicle experiences high-frequency attitude changes, such as those encountered on rough roads, leading to misalignment and inability to correctly superimpose images on the foreground view.
Innovation Solution
A virtual image display device that acquires attitude change information at both low-frequency and high-frequency bands, using a low-frequency information acquisition portion and a high-frequency information acquisition portion to correct image data and displace the original image on a display surface, ensuring continuous and correctly superimposed virtual image display during high-frequency attitude changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display is interrupted during high-frequency attitude changes, then misalignment is avoided, but continuous display capability deteriorates
Solution Approach 1:
The patent segments the attitude change compensation into two independent parts: low-frequency compensation through image rendering correction and high-frequency compensation through image displacement. This segmentation allows each part to handle its specific frequency range effectively, enabling continuous display while maintaining accuracy during high-frequency attitude changes.
Solution Approach 2:
The patent implements dynamic compensation by separately processing low-frequency and high-frequency attitude changes through different mechanisms. The low-frequency image rendering adapts to gradual attitude changes, while the high-frequency image displacement responds to rapid attitude changes, together providing continuous accurate display during vehicle motion.
2Device complexity
If only low-frequency attitude change compensation is implemented, then device complexity is reduced, but misalignment during high-frequency changes worsens
Solution Approach 1:
The patent divides the frequency spectrum into low-frequency and high-frequency bands, applying different compensation strategies to each. This segmentation enables the system to handle both frequency ranges with appropriate methods, improving alignment precision without requiring a single overly complex mechanism.
Solution Approach 2:
The patent changes the compensation parameter based on frequency: using image rendering correction for low-frequency changes and image displacement for high-frequency changes. This parameter change allows the system to adapt to different attitude change rates, maintaining precision across various driving conditions.
3Measurement precision
If image displacement is used for high-frequency compensation, then alignment precision is improved, but processing speed requirements increase
Solution Approach 1:
The patent segments the compensation task by frequency, assigning image displacement specifically to high-frequency compensation where it provides superior precision. The low-frequency compensation uses computationally lighter image rendering correction, balancing precision requirements with processing speed capabilities.
Solution Approach 2:
The patent applies image displacement selectively only for high-frequency compensation rather than for all frequency ranges. This partial application optimizes processing speed by using the computationally intensive method only where necessary, while relying on the simpler image rendering for low-frequency changes.
Data Source
AI summary
A virtual image display device that displays a virtual image by projecting a display light image to a projection area of a vehicle, includes: a low-frequency information acquisition portion that acquires attitude change information of the vehicle at a low-frequency band; a high-frequency information acquisition portion that acquires attitude change information of the vehicle at a high-frequency band; an image renderer that renders image data of the display light image corrected to reduce misalignment attributed to the attitude change at the low-frequency band; a projection optical unit that includes a display surface to display an original image based on the image data, and projects light of the original image as the display light image; and a display controller that displaces the original image to reduce the misalignment of the virtual image attributed to the attitude change at the high-frequency band.