Head-Up Display Projection Control for Line-of-Sight Recognition
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Solution Overview
Problem
Current vehicle head-up display (HUD) systems struggle to maintain accurate recognition of the driving situation when a driver's line of sight deviates and then returns within the projection range, leading to potential delays in focusing on the actual road situation.
Innovation Solution
A projection type display device and method that includes a sight line detection unit to stop and restart projection light based on the driver's line of sight, using a projection controller to enhance visibility over time when the line of sight re-enters the projection range, incorporating a light source, light modulation element, and projection unit, and allowing manual adjustment of visibility enhancement parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If projection light is continuously displayed to ensure driver can always see the image, then visibility of the image is improved, but the driver may focus on the image instead of the road situation when line of sight returns to projection range, causing recognition delay
Solution Approach 1:
The projection light is controlled to be displayed periodically based on detected line of sight direction, rather than continuously. When line of sight is within projection range, light is displayed; when outside, light is stopped. This periodic display prevents continuous focusing while maintaining visibility when needed.
Solution Approach 2:
The system uses a line of sight detection unit to continuously monitor driver's gaze direction and provides feedback to the projection control unit. Based on this feedback, the projection light is dynamically adjusted - displayed when line of sight is within range, stopped when outside - creating a closed-loop control system that resolves the contradiction between visibility and recognition delay.
2Use of energy by moving object
If projection light is stopped when line of sight is out of projection range to save energy, then power consumption is reduced, but the driver cannot quickly recognize the image when line of sight returns to projection range
Solution Approach 1:
The projection light operates periodically based on line of sight detection rather than continuously or never. When line of sight returns to projection range after being outside, the system resumes display, balancing energy savings with quick re-acquisition capability.
Solution Approach 2:
The system maintains readiness to display projection light by monitoring line of sight direction continuously. When line of sight enters projection range, the projection light can be quickly restored without significant delay, as the system is already prepared to activate based on the detected gaze direction.
3Adaptability or versatility
If projection range is set to cover wide area to accommodate different driver positions, then adaptability to different drivers is improved, but the precision of line of sight detection and projection timing is reduced
Solution Approach 1:
The projection range and its position are made dynamically adjustable based on detected line of sight direction. The system adapts to different driver positions by shifting the projection range accordingly, maintaining both wide adaptability and precise detection through dynamic repositioning rather than fixed wide coverage.
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
Ensures accurate recognition of the driving direction even with complex line of sight changes by optimizing the projection timing and visibility enhancement, reducing power consumption, and enhancing the HUD's durability.
Implementation Method 1
a light source, a light modulation element that spatially modulates light emitted from the light source
Implementation Method 2
a light modulation element that spatially modulates light emitted from the light source
Implementation Method 3
a projection unit that projects light spatially modulated by the light modulation element onto a projection surface mounted in a vehicle as projection light
Data Source
AI summary
The projection type display device includes a projection display unit that includes light sources, a light modulation element that spatially modulates light emitted from the light sources, and a projection unit that projects light spatially modulated by the light modulation element onto a projection surface; a sight line detection unit that detects a line of sight; and a system controller that stops projection of the projection light onto the projection surface by the projection display unit in a state where the line of sight detected by the sight line detection unit is out of the projection surface and restarts the projection of the projection light onto the projection surface by the projection display unit after a first time elapses after a timing of moment when the line of sight is determined to move from an outside of the projection surface to an inside of the projection surface.