Coplanar Sensor Electrode Arrangement for Capacitance Detection
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Solution Overview
Problem
Current touch sensors face difficulties in detecting significant changes in capacitance due to a long distance between electrodes, leading to challenges in converting these changes into detailed image data, particularly for biological characteristics like fingerprints.
Innovation Solution
The coplanar sensor design features first and second sensing units with electrode blocks on the same imaginary plane, reducing the distance between electrodes and enhancing the detection of capacitance changes, allowing for improved image resolution and detail by locating the first and second electrode blocks coplanarly and using conduction blocks to facilitate precise electrical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrodes are arranged on opposite sides of the substrate, then the sensor structure is simplified, but the distance between electrodes becomes long resulting in insufficient capacitance change detection
Solution Approach 1:
The patent transitions from a three-dimensional arrangement (electrodes on opposite sides of the substrate) to a two-dimensional coplanar arrangement (electrodes on the same plane). This dimensional change allows the electrodes to be positioned closer together, reducing the distance parameter and thereby enhancing capacitance change detection sensitivity while maintaining structural simplicity.
2Measurement precision
If the distance between electrodes is reduced, then capacitance change detection is enhanced, but the electrode arrangement becomes more complex
Solution Approach 1:
The patent merges the electrode arrangement with the substrate surface by positioning both on the same plane. This integration simplifies the overall structure while achieving the desired reduced distance between electrodes, as the coplanar configuration allows electrodes to be placed adjacent to each other without requiring complex three-dimensional positioning.
3Reliability
If traditional connecting lines are used, then electrical connection is established, but the distance between electrodes remains long reducing detection sensitivity
Solution Approach 1:
The patent introduces conduction blocks as intermediary elements positioned between the electrodes and connecting lines. These conduction blocks serve as mediators that facilitate electrical connection while enabling the coplanar arrangement, allowing the connecting lines to be positioned closer to the electrodes without compromising electrical reliability or increasing the effective distance between sensing elements.
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 enables more precise detection of capacitance changes and voltage variations, resulting in enhanced image resolution and detail, particularly for fingerprint patterns, with improved manufacturing yield and reliability.
Implementation Method 1
The capacitance between each of the first electrodes 921 and the one of the second electrodes 931 adjacent thereto is inversely proportional to the distance (T1)
Data Source
AI summary
A coplanar sensor includes a plurality of first sensing units and a plurality of second sensing units. Each of the first sensing units includes a plurality of first electrode blocks that are spaced apart from each other in a first direction, and a first connecting line that is electrically coupled to the first electrode blocks. Each of the second sensing units includes a plurality of second electrode blocks that are spaced apart from each other in a second direction intersecting the first direction, and a second connecting line that is electrically coupled to the second electrode blocks. Each of the first electrode blocks has a first sensing surface. Each of the second electrode blocks has a second sensing surface. The first sensing surfaces of the first electrode blocks and the second sensing surfaces of the second electrode blocks are coplanar.