Integrated Raindrop Sensor Layout for Real-Time Rain Detection
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Solution Overview
Problem
Current raindrop sensors on windshields fail to detect sudden increases in rain intensity in real time, potentially obstructing a driver's line of sight and increasing the risk of accidents.
Innovation Solution
A raindrop sensor device with both sensing and display functions, incorporating a substrate, raindrop sensor elements, light emitting diodes, and active elements, which applies pulse signals to detect rain intensity and display information, while optimizing circuit layout to prevent signal shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If separate raindrop sensor and display devices are used, then each device can be optimized independently, but circuit layout space is increased and integration is reduced
Solution Approach 1:
The patent combines the raindrop sensor device and display device into a single integrated structure. The sensor element and display element share the same substrate and electrode structure, allowing both functions to be performed by one device rather than requiring separate circuits and components.
Solution Approach 2:
The electrode structure serves multiple functions: it acts as both the sensing element for detecting raindrops (through capacitance changes) and as the display element (through electro-optic effects). This multi-functionality eliminates the need for separate dedicated sensor and display circuits.
2Device complexity
If the active element is positioned closer to the substrate, then circuit layout is simplified, but signal shielding may occur
Solution Approach 1:
The patent resolves the shielding issue by transitioning from a planar layout to a three-dimensional stacked architecture. The sensor element is positioned at a first level closer to the substrate, while the display element is positioned at a second level above it. This vertical separation in the Z-dimension allows both elements to function without mutual interference, eliminating signal shielding problems while maintaining simplified circuit layout.
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
Enables real-time detection of rain intensity changes and effective display of information, enhancing driving safety by preventing obstructed sight due to rain, even during sudden increases in rain intensity.
Implementation Method 1
a first light emitting diode, located on the substrate and electrically connected to the first electrode of the raindrop sensor element
Data Source
AI summary
A raindrop sensor device, including a substrate, a raindrop sensor element, a first light emitting diode, and an active element, is provided. The raindrop sensor element is located on the substrate and includes a first electrode and a second electrode separated from each other. The first light emitting diode is located on the substrate and is electrically connected to the first electrode. The first electrode and the second electrode are closer to the substrate than the active element. The active element is located on the substrate and is electrically connected to the first light emitting diode.