Vehicle Projection Display Eye Tracking Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-up display (HUD) systems for vehicles face challenges in maintaining stable visibility of virtual images during changes in driver eye positions, particularly at high speeds or during reversing operations, leading to potential distractions and discomfort due to frequent adjustments in projection settings.
Innovation Solution
A projection display device and method that includes an eye position detection unit to track the driver's eye positions and control the projection angle of image light on a combiner, determining whether to perform tracking control based on the number of eyes outside the visible range and the vehicle's running state, ensuring that both eyes remain within the visible range without imposing burden on the driver, especially during high-speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection position of image light is changed to track driver eye positions, then the visibility of virtual image is improved, but the driver may perceive flicker during high-speed running
Solution Approach 1:
The system dynamically adjusts the projection position to track eye movements, but applies conditional logic to freeze adjustments during high-speed running to eliminate flicker perception while maintaining visibility during stable conditions
Solution Approach 2:
The system changes the projection angle parameter based on eye position detection, but restricts this parameter change when vehicle speed exceeds a threshold, thereby preventing flicker while maintaining image visibility
2Reliability
If the projection state is frequently changed to accommodate reversing operations, then the visibility for both eyes is improved, but the driver experiences annoyance due to frequent changes
Solution Approach 1:
The system detects reversing operations in advance and preemptively disables tracking control to prevent the harmful effect of frequent annoying adjustments, while maintaining visibility through alternative projection positioning
3Reliability
If tracking control is always performed to keep both eyes within visible range, then the visual recognition is improved, but the system complexity increases
Solution Approach 1:
The control logic is segmented into distinct operational modes (tracking enabled/disabled) based on vehicle state, simplifying the overall control architecture while maintaining effective visual recognition in appropriate conditions
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 solution effectively presents necessary information to the driver without causing distractions, maintaining focus during high-speed driving and reducing eye fatigue by minimizing abrupt changes in the virtual image, especially during low-risk maneuvers, and preventing annoying frequent changes during reversing operations.
Implementation Method 1
captured image data obtained by capturing an image of a driver of the vehicle by an imaging unit
Implementation Method 2
performs, in accordance with input image data, spatial modulation on light emitted by a light source
Data Source
AI summary
A projection display device includes: a projection display unit that performs, in accordance with input image data, spatial modulation on light emitted by a light source, and projects image light obtained through the spatial modulation onto a projection surface of a vehicle to display an image that is based on the image data; an eye position detection unit that detects, in accordance with captured image data obtained by capturing an image of a driver of the vehicle by an imaging unit, positions of two eyes of the driver in the captured image data; and a control unit as defined herein.