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Improved capacitive fingerprint sensing unit, method for acquiring fingerprints and fingerprint sensor

A sensing unit, capacitive technology, applied in the field of fingerprint sensor, acquisition of fingerprints, and improved capacitive fingerprint sensing unit, can solve the problems of low sensitivity and poor image quality, etc.

Active Publication Date: 2019-06-28
SUNASIC TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in practice, the sensitivity of fingerprint sensing devices made of such capacitive fingerprint sensors is not high.
When there is a protective layer on top of the distance sensor, or the distance sensor is encapsulated in a mold housing, the quality of the extracted image will be poor

Method used

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  • Improved capacitive fingerprint sensing unit, method for acquiring fingerprints and fingerprint sensor
  • Improved capacitive fingerprint sensing unit, method for acquiring fingerprints and fingerprint sensor
  • Improved capacitive fingerprint sensing unit, method for acquiring fingerprints and fingerprint sensor

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0030] see Figure 3 to Figure 9 , image 3 It is a cross-sectional view of an improved capacitive fingerprint sensing unit 100 of the present invention, Figure 4 In order to improve the equivalent circuit of the capacitive fingerprint sensing unit 100, Figure 5 Two adjacent modified capacitive fingerprint sensing units 100 are shown, illustrating the fingerprint sensing architecture 110 and the corresponding equivalent capacitors located therein, Image 6 is the top view of the improved capacitive fingerprint sensor, Figure 7 The equivalent circuit for the charge assignment counterpart of the output voltage, Figure 8 is the equivalent circuit of the second voltage counterpart of the output voltage, Figure 9 Flowchart for the operation of the equivalent circuit.

[0031] The...

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Abstract

The invention provides an improved capacitive fingerprint sensing unit, a fingerprint acquiring method and a fingerprint sensor. The improved capacitive fingerprint sensing unit comprises a substrate framework and a fingerprint sensing framework, wherein the fingerprint sensing framework has a first intermetallic dielectric layer, a second metal layer, a second intermetallic dielectric layer, a third metal layer and a passivation layer. An electrostatic discharging prevention effect can be realized through connecting the third metal layer with an instant voltage inhibition device, and sensitivity of the capacitive fingerprint sensing unit can be improved through enhancing thickness of the first intermetallic dielectric layer and the second intermetallic dielectric layer.

Description

technical field [0001] The invention relates to the technical field of fingerprint sensing, in particular to an improved capacitive fingerprint sensing unit, a method for acquiring fingerprints and a fingerprint sensor. Background technique [0002] For security purposes, there are many biological characteristics of a person that can be used for personal identification, such as fingerprints, retinas, irises, DNA and even facial features. Fingerprint sensors have the lowest cost and complexity for devices that can distinguish between certain physical characteristics of people, and the authentication results are generally good. Furthermore, the amount of data required to store the details of a fingerprint is not large (from 120 bytes to 2K bytes). This makes the fingerprint identification device widely accepted and used in many fields. [0003] There are many types of sensing technologies available for obtaining fingerprints, and optical and capacitive sensing technologies a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 林继周和正平
Owner SUNASIC TECH LTD