Windshield Display Obstruction Detection for Recessed HUD Visibility
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Solution Overview
Problem
Reflective display systems in vehicles, such as PHUD, suffer from foreign objects obscuring display images due to their placement on the instrument panel, making safety-relevant information invisible and difficult to detect.
Innovation Solution
A reflective display system with a detection sensor system that includes image capture sensors and brightness sensors to detect foreign objects on the display surface by analyzing display properties and comparing them with expected characteristics, signaling a fault if obstruction is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the display unit is placed in a recess on the instrument panel to prevent direct glare, then driver eye safety is improved, but foreign objects can obscure the display image without being readily visible
Solution Approach 1:
The system uses detection sensors to continuously monitor the display surface for foreign objects and provides feedback to the control unit, which then alerts the driver through visual or acoustic signals. This closed-loop feedback mechanism enables the system to detect and respond to obstructions that would otherwise go unnoticed in the recessed display configuration.
Solution Approach 2:
The patent introduces detection sensors as an intermediary element between the display unit and the environment. These sensors act as mediators that detect foreign objects on the display surface and transmit this information to the control unit, enabling indirect monitoring of the display surface without requiring direct visual inspection by the driver.
2Strength
If a cover glass is used to protect the display surface, then display protection is improved, but new reflections of ambient light are created that impair image perceptibility
Solution Approach 1:
The patent extracts the protective function from a physical cover glass and implements it through a software-based detection and alert system. By removing the cover glass element, the system eliminates the source of problematic reflections while maintaining protection through active monitoring and driver notification of foreign objects.
3Object-affected harmful factors
If the display is positioned to be invisible from the normal visual position to prevent direct viewing, then glare is reduced, but foreign objects lying in the optical path are not detected
Solution Approach 1:
The system transitions from two-dimensional visual detection by the driver to three-dimensional sensing using detection sensors positioned in different spatial locations. This dimensional change allows the sensors to detect foreign objects on the display surface from angles and positions not visible to the driver, enabling detection without compromising the invisible display design.
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
Automated detection of foreign objects on the display surface, ensuring visibility of safety-relevant information by alerting occupants to display obstructions.
Implementation Method 1
The display is reflected on the inside of the windshield, allowing the reflected image to be perceived by a vehicle occupant
Data Source
Figure 1a~1b
Figure 2~3
AI summary
The invention relates to a reflection display system for displaying a display image for a vehicle occupant of a motor vehicle by reflecting the display image on a windshield, comprising: - a display unit which is designed to display the display image on a display surface; - a detection sensor system for detecting the displayed display image on the display surface; and - a control unit which is designed to actuate the display unit for displaying purposes, ascertain detection information on the basis of the detected displayed display image, ascertain the presence of a foreign object on the display surface of the display unit on the basis of the displayed display image and on the basis of the detection information, and signal a disruption of the display if the presence of a foreign object on the display surface of the display unit has been ascertained.