Fingerprint Identification Electrode Density Optimization
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Solution Overview
Problem
Current touch control apparatuses with fingerprint identification functions have limited electrode arrangement density in the biometric feature recognition module, resulting in lower resolution and accuracy in fingerprint identification.
Innovation Solution
The apparatus includes a substrate with a visible region containing a fingerprint identification region where the first and second primary electrodes are crossly arranged with narrower line widths, allowing for a higher density of secondary electrodes, increasing the resolution and accuracy of fingerprint identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of electrode lines in the biometric feature recognition module is limited, then the device complexity is reduced, but the resolution and accuracy of biometric feature recognition deteriorate
Solution Approach 1:
The patent divides the electrode system into two distinct sets: primary electrodes for general touch control and secondary electrodes specifically for fingerprint identification. This segmentation allows each electrode set to be optimized for its specific function, enabling high-resolution fingerprint recognition without requiring a uniformly dense electrode grid across the entire display area, thus managing device complexity while improving measurement precision in the fingerprint region.
Solution Approach 2:
The patent implements different electrode arrangements in different regions: the primary electrode grid provides general touch sensitivity, while the secondary electrodes are densely arranged specifically in the fingerprint identification region. This local quality approach ensures high resolution where needed (fingerprint area) without increasing complexity across the entire device, resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the arrangement density of electrode lines in the biometric feature recognition module is reduced, then the ease of manufacture is improved, but the resolution and accuracy of biometric feature recognition deteriorate
Solution Approach 1:
By segmenting the electrode system into primary and secondary electrodes with different functions and arrangements, the patent enables the fingerprint region to achieve high manufacturing precision through dedicated secondary electrodes, while the rest of the device maintains easier manufacturing processes using the simpler primary electrode grid, thus resolving the contradiction between measurement precision and ease of manufacture.
Solution Approach 2:
The patent applies different manufacturing standards to different regions: high-precision secondary electrodes are manufactured only in the fingerprint identification region where measurement precision is critical, while the broader device area uses the more easily manufactured primary electrode structure. This local quality differentiation resolves the contradiction by concentrating manufacturing complexity only where it is necessary for high-resolution fingerprint recognition.
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 increased electrode density in the fingerprint identification region enhances the resolution and accuracy of fingerprint recognition, providing a more secure and user-friendly authentication method.
Implementation Method 1
projective capacitive touch panels
Data Source
AI summary
A touch control apparatus with fingerprint identification function includes a substrate body with a visible region, a plurality of first primary electrodes, a plurality of second primary electrodes, and a fingerprint identification region located in the visible region. The first primary electrodes and the second primary electrodes are mounted in the visible region for sensing a touch coordinate when an object touches on the visible region. The first secondary electrodes are crossly arranged and insulated from the second secondary electrodes in the fingerprint, identification region. Further, a part of the first primary electrodes and the second primary electrodes are extended to the fingerprint identification region. When a user performs a fingerprint identification function, all electrodes in the fingerprint identification region are used to detect and identify the user's fingerprint.