Vehicle Signal Light Mixing Red and Amber for Protanopia Visibility
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Solution Overview
Problem
Individuals with protanopia have difficulty perceiving vehicle signal lights, such as stop lamps and tail lamps, due to lower luminosity factors for red light, making it challenging to determine if these lights are turned on.
Innovation Solution
A vehicle signal light configuration that includes a first light source emitting red light and a second light source emitting amber light, with the amber light source having a higher luminosity factor for individuals with protanopia, allowing both normal color vision individuals to perceive red color and those with protanopia to determine if the signal light is on, through the adjustment of the integrated intensity ratio of red to amber light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only red light sources are used, then the device structure is simple, but the signal is not perceptible to individuals with protanopia
Solution Approach 1:
The patent segments the light source into distinct red light-emitting elements and amber light-emitting elements. This segmentation allows independent control and optimization of each wavelength component, enabling the system to address the specific perceptual needs of different color vision groups while maintaining a manageable structural organization.
2Reliability
If mixed red and amber light is used, then both normal color vision and protanopia individuals can perceive the signal, but the chromaticity control becomes more complex
Solution Approach 1:
The patent employs dynamic control of the red and amber light source intensities, allowing the chromaticity of the emitted light to be adjusted based on operational requirements. The intensity ratio between red and amber components can be varied to optimize perceptibility under different conditions while maintaining compliance with regulatory chromaticity standards for vehicle signal lights.
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 improves brightness perception for individuals with protanopia by 10.8% and ensures that normal color vision individuals can perceive the red color, meeting chromaticity standards for stop and tail lamps in North America and Europe.
Implementation Method 1
a first light source configured to emit red light and a second light source configured to emit amber light
Implementation Method 2
a light emitting unit configured to emit light via transmission of light obtained through mixing of the red light and the amber light, and an optical component configured to control the red light and the amber light
Data Source
AI summary
Provided is a vehicle signal light in which a person with protanopia (p-type color vision deficiency) can perceive whether or not the vehicle signal light, e.g., a stop lamp, a tail lamp, or the like, is turned on. The vehicle signal light includes a first light source configured to emit red light and a second light source configured to emit amber light. The first light source and the second light source are simultaneously turned on and are configured to emit light with a higher luminous intensity in response to a braking operation, and the emission intensity of the first light source is higher than that of the second light source.