Vehicle Head-Up Display Eye Tracking Correction
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Solution Overview
Problem
Current techniques for making virtual images visible to subjects, such as drivers, face challenges in providing clear and distortion-free views, especially in vehicles where the image projection system needs to account for the position and orientation of both eyes to reduce visual distortion and improve convenience.
Innovation Solution
An image projection apparatus and three-dimensional projection system that includes a display, optical members, and a controller to dynamically correct images based on the position of both eyes, using correction information and a parallax barrier to project images onto a first optical member, ensuring minimal distortion and enhanced visibility of virtual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a virtual image projection system is used in vehicles, then visibility of information is improved, but visual distortion occurs due to eye position variations
Solution Approach 1:
The system dynamically adjusts the projection parameters based on detected eye positions. The controller modifies the projection image in real-time according to the subject's eye position, transforming a static projection system into a dynamic one that adapts to varying observation conditions, thereby eliminating distortion while maintaining visibility.
Solution Approach 2:
The system incorporates eye position detection as feedback to control the projection parameters. By detecting the subject's eye position and using this information to adjust the projection image, the system creates a closed-loop control mechanism that compensates for distortion and optimizes image quality for each observer.
2Measurement precision
If the projection system is adjusted for different eye positions, then image accuracy is improved, but system complexity increases
Solution Approach 1:
The system introduces an eye position detection apparatus as an intermediary component between the subject and the projection system. This mediator detects eye positions and provides data to the controller, enabling accurate image adjustment without requiring complex direct manipulation of projection parameters for each eye position variation.
3Manufacturing precision
If dynamic correction based on eye position is implemented, then visual distortion is reduced, but processing time increases
Solution Approach 1:
The system performs preliminary detection of eye positions and pre-calculates the necessary projection adjustments before the actual projection occurs. By preparing the corrected projection data in advance based on detected eye positions, the system minimizes real-time processing delays while maintaining high correction accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces visual distortion of virtual images by dynamically adjusting the image projection based on eye positions, improving the convenience and clarity of virtual image visibility for subjects, particularly in vehicle-based applications.
Implementation Method 1
The optical member is configured to project the image light, the light beam direction of which is defined by the optical element, so that a virtual image of the display surface is formed
Data Source
AI summary
A three-dimensional projection apparatus includes a display including a display surface having a plurality of subpixels arranged in a grid along a first direction and a second direction substantially orthogonal to the first direction, an optical element configured to define a light beam direction of an image light emitted from the subpixels for each strip-shaped region of a plurality of strip-shaped regions extending in the second direction on the display surface, an optical member configured to project the image light, the light beam direction of which is defined by the optical element, so that a virtual image of the display surface is formed, and a controller configured to acquire information related to a position of an eye of a subject and to correct, in accordance with the position of the eye, the optical element and an image to be displayed by the display surface.