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Fingerprint sensor having ESD protection

A technology for electrostatic protection and electrostatic protection electrodes is applied in the field of fingerprint sensors, which can solve the problems of damage to the electronic components of the sensing electrode 51, inability to ensure positive and negative static electricity, and leakage.

Active Publication Date: 2016-06-22
ELAN MICROELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the electrostatic protection electrode 60 is only connected to the ground terminal GND, it is impossible to ensure that both positive and negative static electricity can be drained away, so it is still possible to damage the sensing electrode 51 or other electronic components, so further improvement is necessary.

Method used

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  • Fingerprint sensor having ESD protection
  • Fingerprint sensor having ESD protection
  • Fingerprint sensor having ESD protection

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Embodiment Construction

[0042] The following further illustrates the detailed technical content of the electrostatic protection fingerprint sensor of the present invention with several embodiments.

[0043] See first figure 1 and figure 2 As shown, it is a schematic diagram of the first embodiment of the electrostatic protection fingerprint sensor of the present invention, which includes a body 10 and an electrostatic protection circuit 31 .

[0044] The body 10 includes a fingerprint sensing electrode array and an electrostatic protection electrode 20; wherein the fingerprint sensing electrode array includes m*n sensing electrodes 11 arranged in m columns (parallel to the H2 direction) and n rows (parallel to the H1 direction) matrix, and the electrostatic protection electrode 20 is used to provide electrostatic protection for the fingerprint sensing electrode array.

[0045] Such as figure 2 As shown, the electrostatic protection circuit 31 is connected to the electrostatic protection electro...

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Abstract

A fingerprint sensor having ESD protection has a body and an ESD protection circuit. The body has a fingerprint sensing electrode array and an ESD protection electrode providing an ESD protection to the fingerprint sensing electrode array. The ESD protection circuit is connected respectively to the ESD protection electrode, a high electric potential terminal and a low electric potential terminal. The ESD protection circuit provides a first static electricity discharge path to the high electric potential terminal, and a second static electricity discharge path to the low electric potential terminal. The fingerprint sensor provides two static electricity discharge paths, so that the fingerprint sensor has a better ESD protection.

Description

technical field [0001] The invention relates to a fingerprint sensor, in particular to a fingerprint sensor with electrostatic protection. Background technique [0002] An existing fingerprint sensor 50 such as Figure 12 As shown, in order to prevent static electricity from damaging the plurality of sensing electrodes 51 on the fingerprint sensor 50, an electrostatic protection electrode 60 is arranged around the plurality of sensing electrodes 51, and the electrostatic protection electrode 60 is connected to the ground terminal GND. The electrostatic charges are discharged to the ground terminal GND. [0003] Since the static electricity protection electrode 60 is only connected to the ground terminal GND, it is impossible to ensure that both positive and negative static electricity can be released, and thus the sensing electrode 51 or other electronic components may be damaged, so further improvement is necessary. Contents of the invention [0004] In view of the above...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/1329G06V40/1306G01D5/24H01L27/0248G01R27/2605H03K17/955G06V40/12
Inventor 王俊淇江宗殷杨昭锜
Owner ELAN MICROELECTRONICS CORPORATION