Laminated Capacitive Electrode Layout for Compact Proximity Detection
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Solution Overview
Problem
General detection devices with separate contact and proximity detection electrodes face challenges in optimizing detection capability while minimizing device size, as the overlap of these electrodes can lead to deteriorated detection performance.
Innovation Solution
A detection device with a laminated structure featuring an upper and lower detection electrode, an insulation layer, and a switching unit that allows switching between insulation and short-circuit states to enhance detection capability and prevent size increase, using thin film conductors and insulation materials for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact detection electrode and proximity detection electrode are disposed in different positions on the same plane, then detection capability is optimized, but device size increases
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional laminated arrangement by stacking detection electrodes on different layers separated by insulation layers. This vertical stacking allows multiple detection functions (contact and proximity detection) to coexist without increasing the planar footprint, effectively resolving the contradiction between detection capability and device size.
Solution Approach 2:
The patent implements a nested structure where multiple detection electrodes are embedded within layered insulation materials. The first detection electrode is nested within a first insulation layer, which is then nested within a second insulation layer containing the second detection electrode. This nested arrangement enables compact integration of multiple detection functions while maintaining optimal detection performance.
2Area of stationary object
If contact detection electrode and proximity detection electrode overlap with each other, then device size is reduced, but detection capability deteriorates
Solution Approach 1:
The patent introduces insulation layers as intermediary structures between overlapping detection electrodes. The first insulation layer and second insulation layer act as mediators that electrically isolate the first detection electrode from the second detection electrode, preventing mutual interference while allowing the electrodes to overlap in the planar view. This enables compact device size without sacrificing detection capability.
Solution Approach 2:
The patent segments the detection system into distinct functional layers separated by insulation materials. Each detection electrode is segmented into its own insulated layer, allowing independent operation and detection functions. This segmentation enables the electrodes to overlap spatially while maintaining electrical independence and optimal detection performance.
3Measurement precision
If shield electrode is disposed on back surface of detection electrode, then detection performance is improved, but device complexity increases
Solution Approach 1:
The patent makes the insulation layers serve multiple functions: they provide electrical insulation between detection electrodes, act as structural separators in the laminated configuration, and function as shielding elements that prevent parasitic capacitance effects. This multi-functionality reduces the need for separate shield electrodes, thereby improving detection performance without significantly increasing device complexity.
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 effectively suppresses detection capability deterioration and maintains a compact size by utilizing the upper electrode's electrostatic capacitance to compensate for the lower electrode's reduced detection area, enabling accurate proximity state detection with reduced overlap effects.
Implementation Method 1
detection capability of a detection device is optimized based on a change in electrostatic capacitance of a detection electrode
Implementation Method 2
switching between a first state in which the upper detection electrode and the lower detection electrode are insulated from each other and a second state in which the upper detection electrode and the lower detection electrode are short-circuited to each other
Data Source
AI summary
A detection device includes an upper detection electrode, a lower detection electrode disposed under the upper detection electrode in an overlapping manner, a proximity state detection unit configured to detect a proximity state of a detection target relative to a detection surface based on a change in at least one of electrostatic capacitances of the upper detection electrode and the lower detection electrode, and a switching unit configured to perform switching between a first state in which the upper detection electrode and the lower detection electrode are insulated from each other and a second state in which the upper detection electrode and the lower detection electrode are short-circuited to each other.