Autonomous Vehicle Display for Color-Blind Pedestrians
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Solution Overview
Problem
Autonomous and semi-autonomous vehicles struggle to effectively communicate their intentions to vulnerable road users, such as pedestrians and cyclists, especially those with chromaticity defects, regarding whether they have been perceived and whether it is safe to cross, as existing systems rely heavily on color-based visual cues.
Innovation Solution
A system comprising environment sensors, a computer, and a display device on the vehicle that uses contrast lines and pictograms to provide unambiguous visual indications about crossing permissions, which can be perceived by users with visual perception defects, including color blindness, through a matrix panel with high pixel density and dynamic movements to convey whether the vehicle will stop or continue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If color-based visual cues are used to communicate vehicle intentions, then the communication is intuitive and easily perceived by most users, but users with chromaticity defects (color blindness) cannot reliably perceive the intended message
Solution Approach 1:
The display device is segmented into multiple independent pixel columns that can be individually controlled. Each column can display different brightness patterns, allowing the system to convey multiple types of information simultaneously through spatial segmentation rather than relying solely on color differentiation.
Solution Approach 2:
The system uses dynamic brightness changes and temporal variations in pixel illumination to convey different messages. By varying the intensity and timing of pixel activation rather than relying on static color codes, the system becomes perceivable by users with various visual capabilities including those with chromaticity defects.
2Measurement precision
If a high-resolution matrix panel is used to provide detailed visual information, then the clarity and precision of communication is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The system uses temporal dynamics and sequential activation patterns of pixel columns to convey information over time. Rather than requiring all pixels to be simultaneously active at high resolution, the system uses time-multiplexed display sequences that reduce the instantaneous complexity while maintaining high information precision.
Solution Approach 2:
The system varies multiple parameters including brightness intensity, duration of pixel activation, and temporal sequencing patterns to encode different messages. This multi-parameter encoding approach allows high precision communication without requiring proportionally high spatial resolution, thereby reducing manufacturing complexity.
3Reliability
If multiple visual cues are provided to ensure clear communication with all users, then the reliability of information transmission is improved, but the risk of overwhelming or confusing users increases
Solution Approach 1:
The system incorporates detection of user responses and adjusts its communication strategy accordingly. By monitoring whether users have perceived and understood the intended message, the system can adapt its display patterns to reinforce successful communications or alter its approach if confusion is detected, thereby maintaining reliability without overwhelming users.
Solution Approach 2:
The system uses periodic display sequences with clear temporal structure and rhythm to convey information. These regular, predictable patterns make it easier for users to process and interpret multiple cues without becoming overwhelmed, as the periodic nature provides natural cognitive anchors for understanding the sequence of information.
Data Source
AI summary
A system for implementing an interaction between a semi-autonomous or autonomous motor vehicle and a vulnerable user of a carriageway used by the motor vehicle and potentially crossed by a vulnerable user at a crossing, pedestrians and cyclists being considered to be vulnerable users. The system includes an environment sensor, a computer which processes the data received from the environment sensor, and a display device which is directed to outside of the vehicle and controlled by the computer. The display device being in the form of a horizontal strip occupying a longitudinal end of the vehicle, including an at least four pixels per cm2 matrix panel configured to provide vulnerable users present in the vehicle's environment with a visual indication as to whether or not they may cross the carriageway road surface, and delivers either an indication prompting them to cross or, conversely, an indication forbidding them from crossing.