Fingerprint identification device and fingerprint identification method

Abstract

The invention discloses a fingerprint identification device and a fingerprint identification method. The fingerprint identification device comprises a fingerprint acquisition module, an analog-to-digital conversion module and a control module which are connected sequentially, the analog-to-digital conversion module comprises a quantified voltage generator for generating quantified voltage, the fingerprint acquisition module is used for acquiring fingerprint information, the analog-to-digital conversion module is used for carrying out analog-to-digital conversion for the fingerprint information and outputting quantified fingerprint information data, and the control module is used for controlling the quantified voltage generator to adjust the output range of quantified voltage according to the distribution range of the fingerprint information data in order to broaden the distribution range of the quantified fingerprint information data. Consequently, with the simple circuit and low cost, the fingerprint identification device realizes the dynamic regulation of fingerprint image contrast. By increasing the analog-to-digital conversion resolution of the fingerprint information, the invention increases the grey information contrast and signal-to-noise ratio of the fingerprint image, thus ultimately increasing the rate of subsequent fingerprint identification.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a fingerprint identification device and method. Background technique [0002] There are differences in the depth of the fingerprint path of a person's hand. The convex places are called "ridges" and the concave places are called "valleys". Capacitive fingerprint identification devices use the principle that the “peaks” and “valleys” contained in the fingerprint correspond to the different inductive capacitances, so the amplitude of the output signal is also different under the same AC signal excitation. The image information is transformed into corresponding electrical signals. [0003] For a capacitive fingerprint identification device that uses a fingerprint sensing unit as the basic unit, the fingerprint sensing unit extracts the capacitive coupling signal of each pixel, and then sends it to other parts of the fingerprint identification device to perform operations su...

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Problems solved by technology

However, the cost of strained thin film materials is high in process manufacturing, and it is difficult to realize

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