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Self-detection and self-repair method of broken line in capacitive fingerprint collection system

A fingerprint collection and capacitive technology, which is applied in the field of self-detection and self-repair of bad lines, can solve the problems of "tablet consistency of semiconductor devices, broken lines of capacitive fingerprint modules, and failure to collect images normally, etc., and achieve good repair effect , high applicability, and small amount of algorithms

Active Publication Date: 2021-06-29
JIANGSU BRMICO ELECTRONICS
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  • Claims
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AI Technical Summary

Problems solved by technology

However, under the current manufacturing conditions, it is impossible to guarantee the consistency of these thousands of semiconductor device "flat panels". There are bad lines in the fingerprint module, these bad line areas cannot collect images normally, and always show a certain gray value

Method used

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  • Self-detection and self-repair method of broken line in capacitive fingerprint collection system
  • Self-detection and self-repair method of broken line in capacitive fingerprint collection system

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Embodiment Construction

[0024] In conjunction with the accompanying drawings, the present invention is described in detail, but the scope of protection of the present invention is not limited to the following examples, that is, all simple equivalent changes and modifications made with the patent scope of the present invention and the content of the specification are still patents of the present invention. covered.

[0025] refer to figure 1 , is the broken line self-detection method of a kind of capacitive fingerprint collection system of the present invention, comprises the following steps:

[0026] Step 1, calculating the overall average grayscale of the entire fingerprint image collected and the row average grayscale of each row;

[0027] Step 2, if the overall average gray level of the entire fingerprint image is greater than threshold A, or less than threshold B, then the overall image effect of the judgment module does not meet the mass production standard, and it is judged as a defective prod...

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Abstract

The invention discloses a broken line self-detection and self-repair method of a capacitive fingerprint collection system. During detection, the overall average grayscale of the entire fingerprint image and the row average grayscale of each row are firstly calculated; if the entire fingerprint image is If the average gray level is greater than the threshold A, or less than the threshold B, then the overall image effect of the judgment module does not meet the mass production standard, and it is judged as a defective product, and subsequent steps of bad line detection and repair are not required; if the average gray level of the image is If it is greater than the threshold C, or less than the threshold D, the average gray level of the row is not included in the average gray level of the row block, otherwise the average gray level of the row is included in the average gray level of the row block; all columns are detected in turn. The invention can automatically detect and automatically repair bad lines caused by poor process, process constraints, module preparation, production, use, etc., without manual calibration of the bad line position, good repair effect, can effectively improve fingerprint feature data, and the amount of algorithm Small size, fast running speed and high applicability.

Description

technical field [0001] The invention relates to a capacitive fingerprint collection system, in particular to a method for self-detection and self-repair of broken lines of the capacitive fingerprint collection system. Background technique [0002] Compared with optical fingerprint sensors, capacitive fingerprint sensors have the advantages of better image acquisition effect, better recognition of dry and wet fingers, and anti-fingerprint residue. They are widely used in mobile phones, fingerprint locks, fingerprint access control and other fields. [0003] The acquisition panel of the capacitive fingerprint sensor is a "flat panel" integrated with tens of thousands of semiconductor devices. The finger is attached to it and forms the other side of the capacitor. Due to the unevenness of the finger plane, the convex and concave points touch the flat panel. The actual distance is different, and the resulting capacitance value is also different. According to this principle, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06K9/00G01R31/58
CPCG06T7/0004G01R31/00G06T2207/30168G01R31/50G06V40/1306
Inventor 周斌陶长青戴一峰张飞飞
Owner JIANGSU BRMICO ELECTRONICS
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