Capacitive Sensor Structure for Accurate Surface Deformation Detection
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Solution Overview
Problem
Current sensor devices struggle to detect deformation due to external forces with high accuracy, particularly in capacitive-based systems, limiting the variety and precision of input operations.
Innovation Solution
A sensor device with a deformable surface and a support structure featuring a matrix of capacitive elements, a conductor layer, and multiple support layers, allowing for precise detection of deformation through changes in electrostatic capacitance, even with insulators or large distances between the stylus and sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional capacitive sensor structure is used, then the device is simple in structure, but the detection accuracy of deformation due to external forces is insufficient
Solution Approach 1:
The support structure is divided into multiple support layers (first support layer, second support layer, third support layer) with each layer containing columns at different positions. This segmentation allows each layer to independently transmit deformation forces to the electrode board, improving detection accuracy while maintaining manageable structural complexity through modular design
Solution Approach 2:
The patent introduces a vertical stacking dimension by arranging multiple support layers at different heights above the electrode board. This three-dimensional arrangement allows deformation detection from multiple vertical levels simultaneously, enhancing measurement precision without significantly increasing horizontal structural complexity
2Reliability
If the stylus is positioned far from the sensor surface or an insulator is provided between them, then user comfort and electromagnetic shielding are improved, but the detection sensitivity decreases
Solution Approach 1:
By stacking multiple support layers vertically, the patent creates multiple capacitive coupling paths at different vertical distances from the electrode board. This allows the system to maintain detection sensitivity even when the stylus is farther from the surface or separated by insulators, as the cumulative effect of multiple layers compensates for the increased distance
Solution Approach 2:
The patent uses a composite structure combining multiple support layers with different configurations (columns at different positions and heights) to create a system that maintains electrical coupling effectiveness despite physical separation or insulating barriers, thereby preserving detection sensitivity while allowing user comfort optimizations
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 the accuracy and sensitivity of detecting touch, press, curvature, and distortion, enabling a wider range of input operations while maintaining electromagnetic shielding and user-friendliness.
Implementation Method 1
the electrode board is capable of detecting deformation of the first surface due to external forces by detecting the amount of change of electrostatic capacitance by using the plurality of capacitive elements
Data Source
AI summary
Provided is a sensor device, including: a deformable first surface; a second surface facing the first surface; an electrode board between the first surface and the second surface, the electrode board including a plurality of capacitive elements arranged in a matrix; a support including a first support layer and a second support layer, the first support layer including a plurality of first columns, the second support layer being layered on the first support layer, the support being deformable following deformation of the first surface, the support connecting at least one of the first surface and the second surface to the electrode board; and a conductor layer supported by the support.