Light Intensity Sensing Array Gating for Fingerprint Signal Accuracy
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Solution Overview
Problem
Inaccurate fingerprint collection due to the off-state current of switching transistors interfering with weak fingerprint signals in light intensity detecting units used in fingerprint identification systems.
Innovation Solution
A light intensity detecting unit comprising N scanning signal lines, J reading signal lines, and at least one enable signal line, with N×J photoelectric conversion circuits and gating circuits, where the gating circuits transmit electric signals to reading signal lines in response to enable signals, reducing the influence of off-state current by selectively turning on and off transistors connected to the same reading signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photoelectric conversion elements and switching elements are used in light intensity detecting units, then optical signals can be collected and converted, but off-state current from switching elements interferes with weak fingerprint signals causing inaccurate detection
Solution Approach 1:
The patent divides the array of photoelectric conversion elements into multiple groups, with each group independently connected to a switching element. This segmentation ensures that when one switching element is in off-state, only its associated group is affected, limiting the propagation of off-state current interference to other signal channels and improving overall detection accuracy
Solution Approach 2:
The patent introduces an intermediate buffer layer or insulating structure between the switching elements and the photoelectric conversion elements. This intermediary component isolates the off-state current from the weak fingerprint signals, preventing direct interference while maintaining the functional connection needed for signal transmission
2Area of stationary object
If more photoelectric conversion circuits are added to improve detection coverage, then signal collection capability increases, but the complexity of wiring and switching elements increases
Solution Approach 1:
The patent merges multiple photoelectric conversion circuits that share common control signals into groups, where each group is controlled by a single switching element. This merging approach maintains comprehensive detection coverage across the array while significantly reducing the total number of switching elements and wiring connections required
Solution Approach 2:
The patent designs the control signal lines to serve multiple functions by routing them to control groups of photoelectric conversion circuits. A single control signal line can simultaneously manage multiple switching elements or multiple groups, reducing the overall number of control lines needed and simplifying the wiring architecture
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 configuration significantly reduces the leakage current interference, enhancing the signal-to-noise ratio and improving the accuracy of light intensity detection for applications like fingerprint identification.
Implementation Method 1
N×J photoelectric conversion circuits configured to convert optical signals into electric signals
Data Source
AI summary
A light intensity detecting unit, a display panel, and a method of detecting light intensity are provided. The light intensity detecting unit includes N scanning signal lines, J reading signal lines, at least one enable signal line, N×J photoelectric conversion circuits configured to convert optical signals into electric signals, and at least one gating circuit. Each of the reading signal lines is connected to one or more of at least one gating circuit. Each of the gating circuits is connected to output terminals of a plurality of photoelectric conversion circuits. Each of the scanning signal lines is connected to one or more photoelectric conversion circuits. Each of the enable signal line is connected to one or more of the at least one gating circuit. The gating circuit is configured to transmit the electric signal to the reading signal line in response to an enable signal from the enable signal line.