Overlapping Electrode Sensing Device for Compact Multi-Dimensional Pressure Detection
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Solution Overview
Problem
Current capacitive pressure sensing devices, particularly array-type multi-dimension sensing devices, face challenges with oversized area requirements and inability to be applied to medium and small-sized devices due to their layout limitations.
Innovation Solution
A sensing device design featuring a first and second substrate with overlapping electrodes and signal lines, including first and second axis electrodes, and a reset structure, allowing for array-type layout and enabling detection of pressure in multiple dimensions without the need for floated electrodes, which facilitates compact and efficient pressure sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-dimension capacitive sensing technique is used, then sensing capability is improved, but device area becomes oversized
Solution Approach 1:
The patent transitions from planar electrode arrangements to a three-dimensional stacked configuration with first and second substrates positioned at different heights. The first electrodes are located on the lower substrate while second electrodes are on the upper substrate, creating vertical overlap that enables multi-dimensional sensing within a compact footprint. This spatial dimensionality change allows the device to detect pressure, shear force, and touch events simultaneously without requiring excessive lateral area.
Solution Approach 2:
The patent implements a nested structure where the first electrodes and second electrodes are partially overlapping in a vertical arrangement. The first axis electrodes and second axis electrodes are positioned to overlap with each other and with the corresponding second electrodes, creating a nested configuration that maximizes sensing functionality within minimal space. This nesting approach allows multiple sensing functions to coexist in the same spatial region.
2Measurement precision
If array type layout is implemented, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the sensing device into distinct functional segments: first substrates, second substrates, first electrodes (including first axis and second axis electrodes), and second electrodes. Each segment performs a specific function and can be independently configured. The array of first electrodes and second electrodes are segmented into different axes, allowing precise detection while maintaining modular simplicity in the overall structure.
Solution Approach 2:
The patent creates a multi-functional sensing device where the same electrode array structure serves multiple detection purposes. The overlapping first and second electrodes can detect normal pressure, shear force in different directions, and touch events simultaneously. This universal design eliminates the need for separate sensing mechanisms for each function, thereby reducing overall device complexity while maintaining high detection precision.
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 precise detection of pressure and relative shifts in a compact format, suitable for medium and small-sized devices by utilizing overlapping electrodes and signal lines, enhancing the array-type layout and reducing material costs.
Implementation Method 1
the technique of capacitive pressure sensing is proposed to implement the pressure sensing device with low cost
Data Source
AI summary
A sensing device has a first substrate, a second substrate, a plurality of sets of first electrodes, a plurality of second electrodes, a plurality of first axis signal lines, a plurality of second axis signal lines, and a plurality of second signal lines. The second substrate is above the first substrate and has a reset structure. The second electrodes are on the first surface of the second substrate in array. Each set of first electrodes is on the first substrate in array, corresponding to one of the plurality of second electrodes, and having at least one first axis electrode and at least one second axis electrode. The first axis electrode and the second axis electrode both partially overlap with the corresponding second electrode.