Fingerprint detection device and mobile terminal

Abstract

The invention discloses a fingerprint detection device and a mobile terminal. The fingerprint detection device includes a capacitive fingerprint sensor and a capacitive touch-control chip electrically connected with the capacitive fingerprint sensor. The capacitive fingerprint sensor is used for acquiring fingerprint information and converting the fingerprint information into an analog signal; the capacitive touch-control chip is used for converting the analog signal into a digital signal and generating fingerprint image information according to the digital signal. Compared with special-purpose control chip of a fingerprint detection device in the prior art, design and production technologies of the capacitive touch-control chip are more mature and production and application costs are lower. Especially when the fingerprint detection device is applied to a capacitive touch-control terminal, a capacitive touch-control chip of the capacitive touch-control terminal can be reused to realize fingerprint detection and identification so that technology integration degree is improved significantly and application cost is reduced.

Description

technical field [0001] The invention relates to the technical field of fingerprint detection, in particular to a capacitive fingerprint detection device and a mobile terminal with the fingerprint detection device. Background technique [0002] The capacitive fingerprint detection device can be applied to various terminal devices, and has been gradually applied to capacitive touch screen mobile terminals. An existing capacitive fingerprint detection device includes a capacitive fingerprint sensor and a control chip. Electrode pattern of capacitive fingerprint sensor such as figure 1 As shown, it includes a ring-shaped emitting electrode b and a plurality of sensing electrodes a. The distribution pattern of the sensing electrode a is as follows figure 2 As shown, they are arranged in Cm rows and Rn columns, a total of mxn. The control chip needs to have multiple signal channels, and the multiple signal channels are respectively connected to the sensing electrode a and the...

AI Technical Summary

Problems solved by technology

The design and production technology of the capacitive touch chip is relatively mature, and the manufacturing and application costs are relatively low; the control chip of the capacitive fingerprint detection device is a special control chip, and the design and production technology is not yet mature, so the manufacturing and application costs are relatively high.

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