Curved Electrode Mutual-Capacitance Fingerprint Recognition
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Solution Overview
Problem
Current mutual-capacitance fingerprint recognition devices face challenges in accurately distinguishing fingerprint ridges and valleys due to low sensitivity, resulting in difficulty in recognizing unique fingerprint patterns.
Innovation Solution
The implementation of a mutual-capacitance touch sensing pattern recognition device with curved sensing and driving electrode lines, along with resin layers featuring wave-shaped convexes and concaves, enhances capacitance measurement sensitivity by increasing the difference in capacitance values between ridges and valleys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linear sensing and driving electrode lines are used, then the device structure is simple, but the sensitivity for distinguishing fingerprint ridges and valleys is low
Solution Approach 1:
The patent applies curvature by transforming the linear electrode lines into wavy patterns. The sensing electrode lines and driving electrode lines both adopt sinusoidal or wave-shaped configurations, which increase the interaction area with the fingerprint surface and enhance the capacitance difference between ridges and valleys, thereby improving measurement sensitivity while maintaining structural simplicity
Solution Approach 2:
The patent introduces wave-shaped convexes and concaves in the resin layers, adding vertical dimensionality to the electrode structure. This multi-dimensional approach creates deeper capacitance modulation by forming multiple peaks and valleys that correspond to fingerprint features, significantly enhancing the ability to distinguish ridges from valleys
2Measurement precision
If wave-shaped convexes and concaves are added to resin layers, then capacitance difference between ridges and valleys increases, but manufacturing process complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-forming the wave-shaped convexes and concaves in the resin layers during the manufacturing process. These pre-formed structures are designed to correspond with the wavy electrode lines, creating a coordinated system that enhances capacitance modulation while being integrated into the standard fabrication workflow, thus avoiding additional complex post-processing steps
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 design significantly improves fingerprint recognition accuracy by increasing the capacitance difference ΔC, allowing for better distinction and reconstruction of fingerprint patterns.
Implementation Method 1
Mutual-capacitance fingerprint recognition devices use the Tx lines and Rx lines to measure the capacitance differences among various locations of a fingerprint
Data Source
AI summary
In accordance with various embodiments, the disclosed subject matter provides a mutual-capacitance touch sensing pattern recognition device, a related fabricating method, a related display panel, and a related display apparatus. The mutual-capacitance touch sensing pattern recognition device can comprise a plurality of sensing electrode lines and a plurality of driving electrode lines, wherein at least one set of the plurality of sensing electrode lines and the plurality of driving electrode lines have curved portions.