Road Sign Projection Using Amber Light for Low-Light Visibility
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Solution Overview
Problem
Existing vehicle drawing devices face challenges in ensuring high visibility and alerting functionality of signs drawn on road surfaces, particularly in low-light conditions such as those immediately before sunset, where background luminance is approximately 800 lux, making it difficult for passengers of other vehicles or pedestrians to recognize the vehicle's presence or direction.
Innovation Solution
A vehicle drawing device that uses amber-colored light to create a luminance contrast of 0.2 or more with the surrounding environment by irradiating light at a specific intensity and angle, synchronized with the turn signal lamp, and adjusts its luminous intensity to be three times or more than the turn signal lamp's maximum, ensuring high visibility and alerting functionality while maintaining a luminance contrast below 1.0 to reduce light amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminous intensity of the vehicle drawing device is increased to improve visibility of the sign on the road surface, then the luminance contrast with the background environment is improved, but the power consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the luminous intensity to a specific range (3 times or more of the turn signal lamp but maintaining luminance contrast below 1.0). This resolves the contradiction by finding the optimal parameter value that achieves sufficient visibility while avoiding excessive power consumption.
2Illumination intensity
If the luminance contrast is increased to improve alerting function for pedestrians and other vehicles, then the visibility of the sign is improved, but the amount of light irradiated increases
Solution Approach 1:
The patent sets the luminance contrast within a specific range (0.2 or more but less than 1.0) to achieve the alerting function while controlling light irradiation. This parameter optimization resolves the contradiction between visibility and energy loss.
3Reliability
If the vehicle drawing device operates at high luminous intensity to ensure detection in low-light conditions, then the alerting function is improved, but the device complexity increases
Solution Approach 1:
The patent combines the vehicle drawing device with the existing turn signal lamp control system, synchronizing their operation. This merging approach improves reliability in low-light conditions while avoiding the need for a separate complex control system.
4Illumination intensity
If the luminous intensity is set to three times or more of the turn signal lamp to improve visibility, then the luminance contrast is improved, but the device complexity increases
Solution Approach 1:
The patent specifies the luminous intensity as a quantitative parameter (3 times or more of the turn signal lamp) rather than requiring complex control mechanisms. This parameter-based approach improves luminance contrast while keeping the device simple.
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 significantly improves the visibility of signs on the road surface, enhancing the alerting function for passengers and pedestrians by maintaining a high detection rate across varying luminance conditions and reducing power consumption.
Implementation Method 1
a vehicle drawing device that draws a sign on a road surface with amber-colored light
Data Source
AI summary
A vehicle drawing device draws a sign on a road surface with amber-colored light. When a luminance of the sign is assumed as a road surface drawing luminance, and a luminance in a surrounding environment of a driving vehicle is assumed as a background luminance, the amber-colored light is irradiated such that a luminance contrast calculated by the road surface drawing luminance and the background luminance is 0.2 or more.