Road Projection Display With Invisible Light for Reliable Perception
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Solution Overview
Problem
Vehicle display devices that project notification displays on a road surface using flashing light patterns can be inaccurately perceived by perception devices due to the pattern being off when the visible light source is flashing on and off, leading to potential inaccuracies in perception by the perception device.
Innovation Solution
Incorporating both visible and invisible light sources, where the invisible light source remains on when the visible light source is off, ensuring the drawing pattern is always perceivable by the perception device, while also reducing heat generation and power consumption by controlling the light sources' activation based on vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the visible light source is used to project a flashing drawing pattern on the road surface, then the notification display can be made visible to humans, but the perception device cannot accurately perceive the drawing pattern when it is off during flashing
Solution Approach 1:
The patent combines a visible light source and an invisible light source into a single projection system. The visible light source projects the drawing pattern for human visibility, while the invisible light source simultaneously projects the same pattern for perception device detection, merging two lighting functions into one integrated system that resolves the contradiction between human visibility and machine perception accuracy.
Solution Approach 2:
The invisible light source acts as an intermediary that bridges the gap between the flashing visible light pattern and the perception device's need for continuous signal detection. By providing a continuous invisible light presence, it mediates the intermittent visible light to ensure the perception device can continuously track and accurately perceive the drawing pattern's position and movement.
2Measurement precision
If the invisible light source is kept on continuously to ensure continuous perception, then the drawing pattern can be accurately perceived by the perception device, but excessive heat generation occurs
Solution Approach 1:
The invisible light source operates periodically rather than continuously, turning on during periods when the visible light source is off. This periodic operation maintains continuous perception capability for the perception device while reducing the cumulative heat generation that would occur with constant operation, directly addressing the contradiction between perception accuracy and heat management.
3Measurement precision
If the invisible light source is turned on continuously, then the drawing pattern remains perceivable at all times, but power consumption increases
Solution Approach 1:
The system employs periodic activation of the invisible light source, synchronizing its operation with the visible light source's flashing cycle. The invisible light source turns on when the visible light source is off, ensuring continuous perception capability while significantly reducing power consumption compared to continuous operation, thus resolving the contradiction between perception accuracy and energy efficiency.
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
This configuration allows for accurate perception of the drawing pattern by perception devices even when it appears to be flashing, reduces excessive heat generation, and conserves power by turning off the invisible light source when the vehicle is traveling at higher speeds.
Implementation Method 1
a visible light source configured to repeatedly turn on and off to emit visible light
Implementation Method 2
an invisible light source configured to emit invisible light
Data Source
AI summary
A vehicle display device includes a visible light source that repeatedly turns on and off and emits visible light, an invisible light source that emits invisible light, and a projection unit that projects visible light emitted from the visible light source and invisible light emitted from the invisible light source onto a road surface as a drawing pattern.