Fingerprint identification system and electronic device

A fingerprint identification and finger technology, which is applied in the direction of acquiring/organizing fingerprints/palmprints, electrical digital data processing, character and pattern recognition, etc., can solve the problems of affecting and reducing the accuracy of fingerprint identification, and achieve the elimination of the effect of parasitic capacitance, Improved accuracy and performance

Active Publication Date: 2017-02-22
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

However, there will be a parasitic capacitance between the contact layer and the shielding layer, and the capacitance value of the parasitic capacitance is often greater than the capacitance value of the contact capacitance generated by

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  • Fingerprint identification system and electronic device
  • Fingerprint identification system and electronic device
  • Fingerprint identification system and electronic device

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] In the traditional fingerprint identification system, the output signal of the pixel circuit is affected by the internal parasitic capacitance of the pixel circuit and the sensing circuit, so that the signal component related to the change of the contact capacitance in the output signal of the pixel circuit is not significant, and the output signal of the pixel circuit The signal is also affected by temperature and noise, which reduces the accuracy of fingerprint recognition. Therefore, in addition to the normal pixel circuits, the present invention also includes a dummy pixel circuit. The d...

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Abstract

The invention provides a fingerprint identification system comprising a plurality of first pixel circuits, a first sensing circuit, at least one second pixel circuit, a second sensing circuit, and a differential amplification circuit. The first sensing circuit is used for sensing a contact capacitor and outputting a first output signal, wherein the first output signal comprises a large signal component and a small signal component, and the small signal component is related to a variation of the contact capacitor. The second sensing circuit is used for outputting a second output signal, and the second output signal is equal to the large signal component. The differential amplification circuit is used for amplifying the difference between the first output signal and the second output signal in order to generate an amplified output signal, and the amplified output signal is related to the small signal component.

Description

technical field [0001] The invention relates to a fingerprint identification system and an electronic device, in particular to a fingerprint identification system and an electronic device capable of reducing the influence of parasitic capacitance. Background technique [0002] With the rapid development of technology, more and more portable electronic devices such as mobile phones, digital cameras, tablet computers, and notebook computers have become necessary tools in people's lives. Since portable electronic devices are usually used by individuals and have a certain degree of privacy, the data stored in them, such as phonebooks, photos, personal information, etc., are privately owned. Once the electronic device is lost, the data may be used by others to cause unnecessary loss. Although there is currently a password protection method to prevent the electronic device from being used by others, the password is easy to leak or be cracked, and has low security. Moreover, the ...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06V30/144
CPCG06V40/1306G06F3/0418G06F2203/04107G06F3/0443G06F3/044G06V40/1329G06F3/041
Inventor 赵国豪杨孟达
Owner SHENZHEN GOODIX TECH CO LTD
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