Combinational Fingerprint Sensor Block Segmentation
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Solution Overview
Problem
Capacitive fingerprint identification sensors face challenges in accurately detecting fingerprints due to varying signal strengths caused by ridge and valley positions, leading to noise interference and reduced accuracy, especially when sensing elements correspond to partial features.
Innovation Solution
A combinational sensing type fingerprint identification device and method that dynamically configures the size of a sensing block and moves it over the entire sensing plane, using a matrix of sensing electrodes and switches controlled by a controller to form a sensing block, which increases signal strength and reduces noise interference by shielding non-sensing areas with a common signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the area of sensing elements is reduced to increase resolution, then measurement precision is improved, but the number of sensing elements increases and processing time increases
Solution Approach 1:
The sensing plane is divided into multiple sensing blocks, each comprising multiple sensing elements. The controller selectively activates specific sensing blocks based on fingerprint detection needs, rather than using all sensing elements simultaneously. This segmentation allows high-resolution detection in localized areas while maintaining faster processing overall.
Solution Approach 2:
The system dynamically configures and moves sensing blocks across the sensing plane during fingerprint detection. The controller can adjust which sensing blocks are active and their positions based on real-time detection requirements, optimizing both resolution and processing speed adaptively.
2Measurement precision
If sensing elements are increased to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The large array of sensing elements is organized into multiple sensing blocks that can be independently controlled. This segmentation reduces device complexity by allowing the system to manage sensing elements in smaller, more manageable groups rather than as a single large array.
Solution Approach 2:
The system uses only the necessary portion of sensing elements at any given time through selective activation of sensing blocks. This partial action approach maintains detection accuracy while reducing the effective complexity by not requiring all sensing elements to be active simultaneously.
3Adaptability or versatility
If a fixed sensing configuration is used, then device complexity is reduced, but adaptability to different fingerprint positions is decreased
Solution Approach 1:
The sensing blocks are dynamically reconfigurable and can be moved to different positions on the sensing plane. This dynamic capability provides adaptability to detect fingerprints at various positions while maintaining relatively simple control through systematic block activation patterns.
Solution Approach 2:
The same sensing blocks can be used to detect fingerprints at multiple different positions on the sensing plane by moving and reconfiguring them. This multi-functionality increases adaptability without requiring separate sensing elements for each position, thus controlling device complexity.
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 approach effectively and accurately detects fingerprints by optimizing signal strength and reducing noise, allowing for improved fingerprint identification accuracy and efficiency.
Implementation Method 1
capacitive sensing type fingerprint identification device... a plurality of sensing electrodes arranged on the substrate for sensing a fingerprint and generating corresponding sensed signals
Data Source
AI summary
A combinational sensing type fingerprint identification device includes plural sensing electrodes; plural sensing electrode switches; plural first sensed signal connection lines, and a controller. Each sensing electrode switch corresponds to one sensing electrode and has a first terminal, a second terminal connected to a common signal, a third terminal connected to a corresponding sensing electrode, and a control terminal Each first sensed signal connection line is connected to the first terminals of the sensing electrode switches in one column. The controller is connected to the control terminal of each sensing electrode switch for controlling whether the sensing electrode switches are electrically connected to the common signal or corresponding first sensed signal connection lines. The controller configures the control terminals of the sensing electrode switches for allowing a part of the sensing electrodes to be electrically connected to the corresponding first sensed signal connection lines.