Integrated Touchpad Fingerprint Sensor Design
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Solution Overview
Problem
Existing fingerprint acquisition technologies in electronic devices are costly and inefficient, with separate modules for touchpads and fingerprint sensors leading to high costs and reduced detection regions, and integrated designs compromising navigation and accuracy.
Innovation Solution
A touchpad design that integrates fingerprint acquisition capabilities using a single sensor module with densely arranged electrodes, allowing for flexible switching between touch coordinate and fingerprint acquisition modes, reducing costs and enhancing user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate modules for touchpad and fingerprint sensor are used, then fingerprint acquisition accuracy is improved, but device cost increases and detection region decreases
Solution Approach 1:
The patent combines the touchpad and fingerprint sensor into a single integrated module, where the touchpad's sensor array serves dual purposes for both touch coordinate detection and fingerprint pattern recognition. This merging eliminates the need for separate fingerprint sensor hardware, thereby reducing device cost while maintaining fingerprint acquisition capability through the integrated sensor system.
Solution Approach 2:
The sensor array in the integrated module is designed to perform multiple functions: it can operate in touch coordinate detection mode for general navigation and in fingerprint acquisition mode for biometric authentication. By making the sensor system universal, the patent eliminates redundant hardware components and reduces overall device complexity and cost.
2Measurement precision
If separate modules for touchpad and fingerprint sensor are used, then fingerprint acquisition accuracy is improved, but detection region decreases
Solution Approach 1:
By merging the fingerprint sensor functionality into the touchpad module, the entire touchpad surface becomes the detection region. This integration allows the full area of the touchpad to be utilized for fingerprint acquisition, rather than being limited to a small dedicated fingerprint sensor area, thereby significantly expanding the effective detection region.
Solution Approach 2:
The integrated sensor system provides universal detection capability across the entire touchpad area, allowing the same physical space to serve both touch navigation and fingerprint recognition functions. This multi-functionality expands the detection region compared to separate modules where the fingerprint sensor would occupy only a limited area.
3Device complexity
If integrated design is used, then device cost is reduced, but navigation and accuracy are compromised
Solution Approach 1:
The patent employs parameter changes by adjusting the density and arrangement of sensor elements in specific regions of the integrated module. By optimizing sensor parameters such as electrode spacing and signal processing characteristics in the fingerprint detection zones, the system maintains high fingerprint acquisition accuracy while using a cost-effective integrated design rather than separate premium components.
4Measurement precision
If densely arranged electrodes are used, then fingerprint recognition accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the sensor array into distinct functional regions: high-density electrode zones for fingerprint recognition and lower-density zones for general touch navigation. This segmentation allows the manufacturing process to target high-precision electrode placement only where needed for fingerprint accuracy, rather than requiring high-density construction across the entire touchpad area, thereby reducing overall manufacturing complexity.
Solution Approach 2:
The integrated module implements local quality by varying electrode density according to functional requirements. High-density electrodes are concentrated in regions where fingerprint recognition is performed, while other areas use lower-density arrangements sufficient for touch coordination. This localized optimization achieves high fingerprint recognition accuracy without the prohibitive manufacturing complexity of uniform high-density construction throughout.
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 integrated touchpad design improves fingerprint recognition accuracy, reduces production costs, and maintains user-friendly navigation while expanding fingerprint acquisition areas, ensuring secure and efficient fingerprint scanning.
Implementation Method 1
a first electrode group and a second electrode group, wherein the first electrode group includes multiple first sensor electrodes arranged in parallel
Data Source
AI summary
A method for fingerprint acquisition includes: monitoring a fingerprint acquisition triggering event continuously; and starting fingerprint scanning in a partial or whole of a region of a touchpad in response to the fingerprint acquisition triggering event.