Fingerprint Recognition Panel with Merged Scanning Lines
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Solution Overview
Problem
Current fingerprint recognition technologies face issues with non-uniform brightness and definition in collected fingerprint images due to varying exposure time periods of photo-electric conversion modules in different rows, affecting the accuracy of fingerprint recognition.
Innovation Solution
A fingerprint recognition panel is designed with a matrix arrangement of fingerprint recognition circuits, where each row is connected to two different scanning lines, ensuring consistent exposure time periods and image quality through a cascading structure that allows for simultaneous resetting and reading using a single gate driving circuit, reducing the need for additional gate driving circuits and facilitating a narrow frame design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each row of fingerprint recognition circuits is connected to separate scanning lines for independent control, then the exposure time period can be independently adjusted for each row, but the device complexity increases due to the need for multiple gate driving circuits
Solution Approach 1:
Multiple scanning lines are merged into a single scanning line that serves all rows of fingerprint recognition circuits. The gate driving circuit is simplified to a single unit that controls the scanning line, which is repeatedly used to sequentially activate different rows. This merging approach maintains uniform image quality across all rows while significantly reducing device complexity and the number of required gate driving circuits.
Solution Approach 2:
The scanning line is periodically activated in a sequential manner to differentially control different rows over time. By using periodic scanning signals that cycle through different row selections, the system achieves independent control of exposure time periods for each row while using a single gate driving circuit, thus resolving the contradiction between image quality consistency and device complexity.
2Adaptability or versatility
If photo-electric conversion modules in different rows have varying exposure time periods, then flexibility in control is improved, but non-uniform brightness and definition occur in fingerprint images
Solution Approach 1:
All rows of photo-electric conversion modules are given equal treatment in terms of exposure time period through the unified scanning line control mechanism. The single scanning line is sequentially activated to ensure that each row receives the same exposure duration, creating equipotentiality in terms of image quality parameters across all rows, thereby eliminating brightness non-uniformity while maintaining control flexibility through the sequential scanning mechanism.
3Measurement precision
If a cascading structure with multiple scanning lines is used for resetting and reading, then control precision is improved, but the panel structure becomes more complex
Solution Approach 1:
The single scanning line is designed with multi-functionality, serving both for resetting and reading operations by being sequentially activated at different time periods. This universal scanning line replaces what would traditionally require multiple dedicated scanning lines, achieving control precision through sequential activation while simplifying the overall panel structure and reducing the number of components needed.
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 ensures consistent brightness and definition of fingerprint images across all rows, enhancing the accuracy and speed of fingerprint recognition, while simplifying the panel structure and reducing production costs.
Implementation Method 1
the photo-electric conversion module is connected with the gate of the driving transistor and configured to convert a photo signal to an electric signal
Data Source
AI summary
The fingerprint recognition panel includes fingerprint recognition circuits arranged in a matrix, reading signal lines, a gate driving circuit and scanning lines connected with the gate driving circuit. The gate driving circuit is for outputting scanning signals to the scanning lines successively; each fingerprint recognition circuit is in connection with two scanning lines, a reading control end is connected with a first scanning line, and a reset control end is connected with a second scanning line; the first scanning line in connection with the fingerprint recognition circuits of the nth row and the second scanning line in connection with the fingerprint recognition circuits of the (n−m)th row are the same; or the second scanning line in connection with the fingerprint recognition circuits of the nth row and the first scanning line in connection with the fingerprint recognition circuits of the (n−m)th row are the same.