Fingerprint Sensor Region Segmentation Power Reduction
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Solution Overview
Problem
Fingerprint sensing devices in mobile devices consume significant power, leading to increased energy consumption and potential operation errors due to inefficient authentication processes.
Innovation Solution
A fingerprint sensing device with a control circuit that calculates sensing data distributions from sampling regions of a sensor array, compares them with reference distributions, and determines effective contact regions to generate fingerprint information only when a threshold is met, reducing power consumption and preventing false authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint sensing device continuously processes sensing data from the entire sensor array, then authentication accuracy is maintained, but power consumption increases significantly
Solution Approach 1:
The sensor array is divided into multiple sampling regions, and the control circuit selectively processes only those sampling regions that show effective fingerprint contact based on sensing data distribution analysis. This segmentation approach maintains authentication accuracy by focusing processing on relevant regions while reducing overall power consumption by excluding inactive regions from processing.
2Loss of information
If the fingerprint sensing device processes all sensing data regions, then comprehensive fingerprint information is obtained, but operation errors increase due to inefficient processing
Solution Approach 1:
The control circuit performs preliminary analysis of sensing data distribution across sampling regions before generating complete fingerprint information. By identifying and selecting only effective contact regions in advance, the system prepares optimized processing targets that ensure comprehensive fingerprint information is obtained from valid contact areas while avoiding errors from processing invalid or empty regions.
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 reduces power consumption and minimizes operation errors by ensuring that fingerprint information is generated only when a sufficient number of effective contact regions are detected, thereby enhancing the accuracy and efficiency of user authentication.
Implementation Method 1
The sensing circuit includes an integration circuit detecting may change in capacitances from the nodes to generate analog signals
Data Source
AI summary
A fingerprint sensing device includes a sensing circuit configured to extract sensing data from nodes included in each of sampling regions of a sensor array. The fingerprint sensing device also includes a control circuit configured to calculate a number of the nodes based on the extracted sensing data to produce sensing data distributions for each of the sampling regions and compare the sensing data distributions with reference distributions, configured to determine that the sampling regions from which the sensing data distributions corresponding to the reference distributions are extracted are effective contact regions, and configured to generate fingerprint information from the sensor array when the number of effective contact regions is greater than or equal to a threshold.