Windshield Projection Image Stabilization via Driver Eye Tracking
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Solution Overview
Problem
Existing vehicle projection devices struggle to accurately display images on a windshield due to variations in the driver's eye position, leading to positional deviations and potential misunderstandings.
Innovation Solution
A vehicle device with an ECU that includes an image generation unit, viewpoint position identification unit, superimposed position identification unit, image conversion unit, and notification unit, which generates and converts images in real-time to match the driver's viewpoint position, ensuring accurate superimposition on the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection device displays images on a fixed projection surface, then the display position is stable, but the image deviates from the real scenery when the driver's eye position changes
Solution Approach 1:
The patent implements a dynamic display system that continuously adjusts the image display position based on real-time detection of the driver's eye position. The ECU receives eye position information from the viewpoint detection unit and dynamically recalculates the projection coordinates to maintain accurate superimposition, transforming the system from static to adaptive operation
Solution Approach 2:
The system establishes a feedback loop where the viewpoint detection unit continuously monitors the driver's eye position, feeds this information to the ECU, which then adjusts the projection device's display position accordingly. This closed-loop control ensures the image remains accurately superimposed on the real scenery despite changes in driver position
2Measurement precision
If the image is adjusted to follow the driver's eye position, then the superimposition accuracy improves, but the system complexity increases
Solution Approach 1:
The ECU performs multiple functions: it processes navigation data, controls the projection device, receives eye position information from the viewpoint detection unit, calculates adjusted projection coordinates, and outputs control signals. By consolidating these diverse functions into a single control unit, the system achieves the required adaptability without proportionally increasing overall system complexity
Solution Approach 2:
The patent introduces an intermediary coordinate conversion process that translates between the fixed projection surface coordinate system and the dynamic driver-eye-centered coordinate system. This mathematical transformation layer acts as a mediator, enabling accurate superimposition without requiring physical repositioning of projection components
3Area of stationary object
If the projection surface size is limited, then the device structure is compact, but the display area is insufficient when the driver's viewpoint shifts
Solution Approach 1:
The patent addresses the limited projection surface area by utilizing the temporal dimension - continuously adjusting the display position along the trajectory of the driver's eye movement. Instead of expanding the spatial area of the projection surface, the system maintains compact dimensions while achieving extended functional coverage through dynamic repositioning within the existing surface boundaries
Data Source
AI summary
An ECU as a vehicle device includes an image generation unit that generates an image in a predetermined reference coordinate system, a viewpoint position identification unit that identifies a viewpoint position of a driver; a superimposed position identification unit that identifies a display position at which the image is displayed within an eyesight of the driver; an image conversion unit that generates a converted image obtained by converting the image into a coordinate system having the viewpoint position of the driver as a reference point; and a notification unit that displays a display image falling within the converted image so as to be superimposed on the eyesight of the driver with the projection device.