Traffic Light Modulation for Color Vision Deficiency
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Solution Overview
Problem
Individuals with color vision deficiency face challenges in identifying traffic lights, leading to safety concerns due to existing traffic rules and the limitations of current communication technologies.
Innovation Solution
A traffic light system that uses modulated visible light signals, including LED lights, to convey color information through specific frequencies and intensity levels, allowing for identification by color vision deficient individuals using a signal collecting and demodulating unit that converts light signals into electrical signals for color determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visible light communication is used to encode traffic light color information, then color identification capability is improved for color vision deficient individuals, but device complexity increases due to modulation and demodulation requirements
Solution Approach 1:
The traffic light system performs multiple functions simultaneously: it displays traffic control signals through colored lights and encodes color identification information through visible light modulation. The same LED signal lights serve both as visual traffic indicators and as communication transmitters, eliminating the need for separate identification devices and reducing overall system complexity despite adding modulation capabilities
Solution Approach 2:
The patent introduces a signal demodulating unit in the receiver that extracts color identification information from the modulated visible light signals. This intermediary component enables color vision deficient individuals to accurately identify traffic light colors by converting the modulated optical signals into actionable information, resolving the measurement precision issue while managing complexity through specialized processing
2Loss of information
If modulation frequency is used to encode color information, then information transmission accuracy is improved, but difficulty of detecting and measuring increases due to frequency analysis requirements
Solution Approach 1:
The patent employs periodic modulation of visible light signals at distinct frequencies to encode different traffic light colors. Each color (red, yellow, green) is represented by a specific modulation frequency, creating a periodic pattern that can be reliably detected and distinguished. This periodic encoding ensures accurate information transmission while the regular patterns simplify the detection process through frequency analysis
Solution Approach 2:
The system dynamically adjusts the modulation frequency of the visible light signals to convey different color information. The signal demodulating unit on the vehicle dynamically analyzes these frequency variations in real-time, converting the dynamic optical signals into stable color identification results. This dynamic approach maintains high information accuracy while enabling adaptive detection
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
Enhances safety for individuals with color vision deficiency by providing a reliable method to accurately identify traffic light colors, reducing confusion and improving navigation through urban environments.
Implementation Method 1
a light-signal collecting unit, configured to collect a light signal and converting the light signal to an electrical signal
Data Source
AI summary
Traffic light and traffic light color identification system, and methods thereof are provided. A traffic light includes a control unit, configured to generate a control command; a signal modulating unit, configured to modulate an electrical signal based on the control command and output a modulation signal having a modulation frequency corresponding to a color of a signal light of the traffic light; and a signal generating unit configured to control the signal light of the traffic light and to transfer a signal to a vehicle, based on the modulation signal.