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Capacitive fingerprint sensing device and producing method thereof

A manufacturing method and capacitive technology, which can be applied to instruments, character and pattern recognition, computer components, etc., can solve problems such as interference with image quality, and achieve the effect of preventing residual contamination

Inactive Publication Date: 2007-04-11
EGIS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The static electricity of the finger 1 can be discharged through the tungsten metal mesh 113. This completely exposed tungsten metal mesh 113 will ground the residual dirt 114 from the finger and indirectly form a residual dirt capacitor 115 to interfere with the image quality, as shown in FIG. 3

Method used

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  • Capacitive fingerprint sensing device and producing method thereof
  • Capacitive fingerprint sensing device and producing method thereof
  • Capacitive fingerprint sensing device and producing method thereof

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Embodiment Construction

[0043] FIG. 4 shows a schematic diagram of using the capacitive fingerprint sensor of the present invention to read finger prints. As shown in FIG. 4 , the fingerprint sensor 2 includes a plurality of capacitive sensing elements 20 arranged in a two-dimensional (2D) array. When the finger 1 touches the sensor 2, the irregularly shaped ridge (Ridge) on the surface of the finger 1 will contact with part of the capacitive sensing element 20, leaving a corresponding ridge 11 on the sensor 2. The capacitance value curve 11a. By reading the shape of the capacitance curve 11a, the shape of the original peak 11 can be identified.

[0044]FIG. 5 shows a schematic partial top view of a capacitive fingerprint sensor according to a first embodiment of the present invention. FIG. 6 shows a schematic cross-sectional view of the capacitive fingerprint sensor along line 66 of FIG. 5 . As shown in Figures 5 and 6, the capacitive fingerprint sensor 2 of the present invention basically includ...

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Abstract

The capacitive fingerprint sensor can resist electrostatic destruction and pollutant interference, and consists of one base plate, several electrode plates, one metal net, several electrostatic discharge units, several soldering pads and one protecting layer. The electrode plates, the soldering pads and the metal net are in the same height and made of the same material. The electrostatic discharge units are connected to the metal net and ground end and exposed via first openings to make static electricity of fingers flow to the ground end. The metal net is covered with the protecting layer without exposure, and the number of the electrostatic discharge units is greatly smaller than the number of electrode plates, so as to reduce the interference of residual pollutant on fingerprint image.

Description

technical field [0001] The present invention relates to a capacitive fingerprint sensor and a manufacturing method thereof, in particular to a capacitive fingerprint sensor capable of resisting electrostatic damage and residual contamination and a manufacturing method thereof. Background technique [0002] In the existing fingerprint reading method, a finger stained with ink can be used to press the paper, and then an optical scanner is used to scan the paper to input the fingerprint into the computer, and then compare it with the fingerprint pattern in the database. However, the biggest disadvantage of the above method is that it cannot achieve the purpose of real-time processing, so it cannot meet the needs of more and more real-time authentication, such as: network authentication, e-commerce, portable electronic product security, IC card personal identity authentication, security system and many more. [0003] Instant fingerprint reading methods have become a key technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 周正三郑元伟范成至
Owner EGIS TECH