Faulty wire self-detecting and self-repairing method for capacitor type fingerprint collection system

Abstract

The invention discloses a faulty wire self-detecting and self-repairing method for a capacitor type fingerprint collection system. During detection, an overall average gray scale of a whole fingerprint image and a line average gray scale of each line of the image are calculated and collected; if the overall average gray scale of the whole fingerprint image is greater than a threshold value A or smaller than a threshold value B, that overall image effects of a module cannot reach batch production standards is determined, a product is determined as defective product, a subsequent step of faultyline detection and repair is not needed; if the line average gray scale of the image is greater than a threshold value C or less than a threshold value D, the line average gray scale is not included in a line block average gray scale, otherwise the line average gray scale is included in the line block average gray scale, and all rows are orderly detected. Via the faulty wire self-detecting and self-repairing method, faulty lines caused by poor technologies, constrained technology conditions, preparation, production and usage of a module group and the like can be automatically detected and repaired; positions of the faulty lines do not need to be calibrated manually, good repair effects can be exerted, and fingerprint characteristic data can be effectively improved; the method is small in algorithm amount, high in operation speed and high in 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 ...

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

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