Fingerprint Sensor Matrix Potential Difference Calculation
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Solution Overview
Problem
Optical biometric sensors face challenges in improving detection accuracy without causing data overflow, particularly in fingerprint sensors where amplification of analog signals leads to data overflow in digital processing, affecting the detection of subtle differences in signals from photoelectric conversion elements.
Innovation Solution
A detection device with a matrix configuration of photoelectric conversion elements, where potential differences between adjacent detection elements are calculated using specific equations to reduce data values and prevent overflow, allowing for more accurate fingerprint detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplification of analog signals is increased to detect slight differences in signals from photoelectric conversion elements, then detection accuracy is improved, but data overflow occurs in subsequent digital processing
Solution Approach 1:
Instead of amplifying the analog signal and then converting to digital, the patent inverts the approach by directly calculating potential differences between adjacent photoelectric conversion elements in the digital domain. This avoids the data overflow issue that occurs when high amplification is applied to analog signals before ADC conversion, while still achieving accurate detection of subtle signal differences.
Solution Approach 2:
The patent extracts only the necessary information (potential differences between adjacent elements) from the full set of detection signals. By calculating only the differential values between neighboring photoelectric conversion elements rather than processing all amplified signals, the system achieves accurate fingerprint detection while preventing data overflow in digital processing.
2Measurement precision
If amplification of analog stage is increased to detect slight differences in signals, then detection sensitivity is improved, but data overflow prevents good detection
Solution Approach 1:
The patent performs preliminary calculation of potential differences between adjacent detection elements before digital processing. By pre-calculating the differential values in the detection circuit rather than relying on high analog amplification, the system maintains detection sensitivity while avoiding the data overflow that would occur in subsequent digital processing stages.
3Device complexity
If voltage values from detection elements are used directly, then calculation is simple, but detection accuracy is insufficient for subtle fingerprint features
Solution Approach 1:
The patent changes the parameter being processed from absolute voltage values to potential difference values between adjacent elements. This transformation maintains relative calculation simplicity while significantly improving detection accuracy, as the differential values highlight subtle variations in fingerprint features that are imperceptible in absolute voltage measurements.
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 solution enhances detection accuracy by reducing data values, thereby preventing data overflow and improving the precision of fingerprint detection without compromising the sensitivity of signal processing.
Implementation Method 1
a plurality of photoelectric conversion elements such as photodiodes are arranged on a semiconductor substrate
Data Source
AI summary
A detection device includes a sensor area in which a plurality of detection elements including photoelectric conversion elements are arranged in a matrix having a row-column configuration within a detection region, and a detector configured to calculate a detection value corresponding to the detection elements based on a voltage generated in the detection elements.