AR-HUD Display Position Correction for Flicker and Pitch Changes
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Solution Overview
Problem
Conventional AR-HUD systems face challenges in suppressing display flicker and quickly correcting the display position due to rapid changes in vehicle pitch and roll angles, leading to misalignment of virtual images on the scenery.
Innovation Solution
A display control device with an information generation unit, traveling state acquisition unit, posture value acquisition unit, characteristic acquisition unit, filter processing unit, and display position correction unit, which sets filters based on the vehicle's traveling state to process vehicle posture values and eye information, allowing for appropriate filtering and correction of the display position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a low-pass filter is applied to a sensor value to suppress display flicker, then display stability is improved, but the followability of display position correction is lowered
Solution Approach 1:
The patent applies a low-pass filter dynamically adjusted according to vehicle traveling state. When the vehicle is stationary or moving at constant speed, a larger time constant is used for stronger filtering and better flicker suppression. When the vehicle is accelerating or decelerating, a smaller time constant is used to maintain faster correction responsiveness. This dynamic adjustment resolves the contradiction between display stability and correction speed.
2Speed
If the display position is corrected quickly to follow vehicle posture changes, then correction speed is improved, but display flicker increases
Solution Approach 1:
The system dynamically adjusts the low-pass filter time constant based on vehicle acceleration and deceleration states. During rapid posture changes (acceleration/deceleration), the filter allows faster signal passage to maintain correction speed. During stable states, the filter provides stronger smoothing to suppress flicker. This dynamic filtering strategy resolves the contradiction between correction speed and display stability.
3Device complexity
If a fixed filter time constant is used to process vehicle posture values, then device complexity is reduced, but the ability to suppress flicker during different traveling states is worsened
Solution Approach 1:
The patent implements a dynamic filter configuration that adjusts the time constant based on detected vehicle traveling state (stationary, constant speed, accelerating, decelerating). This adds complexity to the control logic but significantly improves display accuracy and flicker suppression across different operating conditions, resolving the contradiction between device complexity and display reliability.
Data Source
AI summary
A display control device sets a display position of an image to be recognized by a driver of a vehicle as a virtual image such that the image is superimposed on a scenery in front of the vehicle. The display control device calculates a correction amount for correcting the display position at which the image is superimposed on the scenery.