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Fingerprint detection circuit, fingerprint detection device and touch panel

A fingerprint detection and circuit technology, which can be used in the acquisition/organization of fingerprints/palmprints, electrical digital data processing, instruments, etc., and can solve the problems of poor fingerprint detection accuracy.

Inactive Publication Date: 2015-12-09
FOCALTECH ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, because the height difference between the ridges and valleys of the fingerprint is relatively small, the accuracy of fingerprint detection by traditional fingerprint detection devices is poor.

Method used

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  • Fingerprint detection circuit, fingerprint detection device and touch panel
  • Fingerprint detection circuit, fingerprint detection device and touch panel
  • Fingerprint detection circuit, fingerprint detection device and touch panel

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Embodiment Construction

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] The existing common fingerprint detection principle is to detect the capacitance change during touch through the fingerprint detection electrode. Due to the height difference between the ridges and valleys in the fingerprint, different electrical signals will be generated, and the fingerprint information can be obtained by processing the electrical signals through correlated double sampling, analog-to-digital conversion circuit ...

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Abstract

The invention discloses a fingerprint detection circuit, a fingerprint detection device and a touch panel. The fingerprint detection circuit comprises an operational amplifier, a feedback branch, a reference capacitor and a fingerprint detection electrode. The operational amplifier comprises a positive input end, a negative phase input end, an output end, a power supply end and a grounding end. The feedback branch is connected with the negative phase input end and the output end. An upper pole plate of the reference capacitor is connected with the negative phase input end. A lower pole plate inputs a first drive signal. The fingerprint detection electrode is connected with the negative phase input end. The positive input end inputs first reference voltage. The power supply end inputs a power supply signal. The grounding end inputs a second drive signal. The fingerprint detection circuit improves the difference of an output signal of the output end by adjusting the first drive signal, the second drive signal or the first reference voltage. According to the invention, the accuracy of fingerprint detection is improved.

Description

technical field [0001] The present invention relates to the technical field of fingerprint detection, and more particularly, to a fingerprint detection circuit, a fingerprint detection device and a touch panel. Background technique [0002] With the continuous development of science and technology, more and more portable electronic devices are used in people's work and daily life, which brings great convenience to people's daily life and work, and becomes indispensable to people's work and daily life. important tool. [0003] Nowadays, portable electronic devices have more and more functions, and more and more privacy information of design users is also required. In order to ensure the security of information, it is necessary to have an encryption function. Setting a fingerprint detection device for a portable electronic device and encrypting by identifying the fingerprint is a relatively high-security encryption method today. [0004] However, because the height differenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F3/044
CPCG06F3/044G06V40/1347G06V40/1306
Inventor 张靖恺程珍娟
Owner FOCALTECH ELECTRONICS
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