Fingerprint detection device and method

A fingerprint detection and fingerprint information technology, which is applied in the acquisition/organization of fingerprints/palmprints, character and pattern recognition, instruments, etc., can solve the problems of reducing the anti-interference ability of the fingerprint detection device, affecting the signal-to-noise ratio of the fingerprint detection signal, etc. Improve the anti-interference ability, improve the anti-interference ability, and filter out the effect of noise

Active Publication Date: 2015-01-21
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

[0003] In terms of measurement signals, the direct impact of changes in the application environment is noise, which will affect the signal-to-noise ratio of the fingerprint detection signal and reduce the anti-interference ability of the fingerprint detection device

Method used

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  • Fingerprint detection device and method
  • Fingerprint detection device and method
  • Fingerprint detection device and method

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no. 2 example

[0074] see Figure 9 , propose the second embodiment of the fingerprint detection method of the present invention, the fingerprint detection method comprises the following steps:

[0075] Step S201: collecting fingerprint information and generating a fingerprint detection signal.

[0076] Specifically, the fingerprint information is collected by the collection module and a fingerprint detection signal is generated, assuming that the fingerprint detection signal is

[0077] Step S202: Perform quadrature mixing and low-pass filtering on the fingerprint detection signal.

[0078] In this embodiment, an analog mixer performs frequency mixing processing on the fingerprint detection signal (which is an analog signal) after analog-to-digital conversion. Specifically, the analog mixer divides the fingerprint detection signal into two paths, and inputs orthogonal reference signals to the two fingerprint detection signals respectively through the reference signal source, such as inp...

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Abstract

The invention discloses a fingerprint detection device and method. The fingerprint detection device comprises a collection module and a processing module. The collection module is used for collecting fingerprint information and generating fingerprint detection signals. The processing module is used for processing the fingerprint detection signals and generating fingerprint image data. The processing module comprises a frequency mixer. The frequency mixer is used for conducting orthogonal frequency mixing and low-pass smoothing processing on the fingerprint detection signals, and converting the alternating current signals of the fingerprint detection signals to direct current signals. In this way, the bandwidth of the fingerprint detection signals can be reduced, the noise in the fingerprint detection signals is filtered out, the signal noise ratio is increased, the sensitivity of fingerprint detection is enhanced, the disturbance resisting capacity is improved, and thus the adaptive capacity of the fingerprint detection device to the application environment is improved.

Description

technical field [0001] The invention relates to the technical field of fingerprint detection, in particular to a fingerprint detection device and method. Background technique [0002] The fingerprint detection device collects fingerprint information through the acquisition module and generates fingerprint detection signals, and then processes the fingerprint detection signals through the processing module to generate fingerprint image data and output them, and then compares and identifies the output signals. Capacitive fingerprint detection devices have gradually begun to be used in handheld devices (such as mobile phones, tablet computers, etc.). Due to the portability of handheld devices, their application environments are also complex and changeable, making fingerprint detection devices also need to cope with various application environments. [0003] In terms of measurement signals, the direct impact of changes in the application environment is noise, which will affect t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/12G06V40/13G06F2218/02G06F2218/08H03D7/00G06V40/1306G06V40/1347H03K17/9622
Inventor 冉锐杨孟达
Owner SHENZHEN GOODIX TECH CO LTD
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