Fingerprint induction device and finger contact detection method

Abstract

The invention provides a fingerprint induction device and a finger contact detection method. The fingerprint induction device comprises a fingerprint detector and a control device; the fingerprint detector is characterized in that: a plurality of driving lines, a first trace line and a second trace line which are electrically connected to the controller are formed on the substrate, and that the first trace line is arranged between the plurality of driving lines and the second trace line; the controller drives a plurality of driving lines under a working mode and receives the capacitance induction signals corresponding to between the driving lines of the first trace line and the second trace line; under a standby mode, the controller produces a capacitance induction signal between the first trace line and the second trace line and determines whether the finger contacts according to the change of the capacitance induction signal; as a result, the invention can perform detection with relatively big capacitance without driving the plurality of driving lines, can save the electricity, does not need to add the extra trace line to cooperate the energy efficient standby mode, and can perform finger contact detection. The size of the fingerprint detector is not increased.

Description

Technical field [0001] The invention relates to a fingerprint sensing device, in particular to a fingerprint sensing device capable of detecting whether there is a finger touch in a standby mode. Background technique [0002] At present, capacitive fingerprint detectors are widely used in electronic devices, such as mobile phones, notebook computers, etc., to confirm the identity of users. Generally, capacitive fingerprint detectors are divided into array type and linear type. When the array type or linear fingerprint detector is formed on the chip together with a sensing circuit, it is susceptible to damage by static electricity, and the production cost is relatively high; Therefore, when the array or linear fingerprint detector is independently formed on a flexible circuit board or similar substrate, and then electrically connected to an external sensing circuit, the electrostatic protection effect is better. The linear fingerprint detector has a larger size than the array fing...

AI Technical Summary

Problems solved by technology

[0005] However, the sensing circuit of the above-mentioned fingerprint detector has a standby mode in order to save power consumption, and the structure of the fingerprint detector must be changed to increase two driving lines, which increases the size of the linear fingerprint detector. , is by no means the best choice for electronic devices of required size

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