Fingerprint recognition sensor and fingerprint detection method

Abstract

The invention relates to the technical field of fingerprint recognition, and discloses a fingerprint recognition sensor and a fingerprint detection method. Sensing units of the fingerprint recognition sensor are dual-mode sensing units; an emission circuit for generating an excitation signal and a receiving circuit for acquiring fingerprint data are arranged in each dual-mode sensing unit; each emission circuit and each receiving circuit are subjected to time sharing multiplexing by the corresponding dual-mode sensing unit. By adopting the dual-mode sensing units which can be implemented and configured to be emission or receiving units, a metal electrode is not required to be arranged on the outer side of a sensing array of the fingerprint recognition sensor to serve as a special emission electrode, and the sensing units are directly adopted as emission sources of the excitation signals, so that piercing pain brought to a human body by high voltage of the emission electrode is avoided, the problems such as technological compatibility brought by the high voltage of the emission electrode are also avoided, the problems of appearance and reliability caused by the emission electrode are also solved, and the manufacturing and assembly flow of a fingerprint recognition sensor module is simplified.

Description

technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to a fingerprint identification sensor and a fingerprint detection method. Background technique [0002] With the continuous development of mobile communication technology, smart phones have integrated functions in various fields. For example, you can send and receive emails, play video and audio files, record meeting minutes, and even hold video conferences through your smartphone. In addition, a large amount of data is usually stored in a mobile phone used by an individual. If the mobile phone is lost or stolen, it is likely to cause even greater losses. Existing mobile phones are usually protected by digital passwords or graphic passwords, which are cumbersome to store and easily cracked. Therefore, it is popular to use the fingerprint password as the password protection of the mobile phone nowadays, which ensures the security and privacy of the mobile phone...

AI Technical Summary

Problems solved by technology

On the one hand, if the finger is directly driven by voltage, there will be current passing through the human body, and the human body will produce a tingling sensation; on the other hand, a ring-shaped metal electrode is set outside the sensing array as the emitting electrode, which increases the manufacturing and assembly of the fingerprint module. difficulty and cost

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