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Electronic device, ultrasonic fingerprint identification device and manufacturing method thereof

A manufacturing method and fingerprint recognition technology, which are applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, and print image acquisition, etc., can solve the problems of low loop efficiency and restricting the recognition sensitivity of ultrasonic fingerprint recognition devices.

Active Publication Date: 2020-01-24
SILEAD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current scheme of an ultrasonic fingerprint recognition device using a single piezoelectric material tends to cause low loop efficiency (loop efficiency=transmitting efficiency×receiving efficiency), thereby restricting the recognition sensitivity of the ultrasonic fingerprint recognition device

Method used

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  • Electronic device, ultrasonic fingerprint identification device and manufacturing method thereof
  • Electronic device, ultrasonic fingerprint identification device and manufacturing method thereof
  • Electronic device, ultrasonic fingerprint identification device and manufacturing method thereof

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Embodiment Construction

[0047] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0048] Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. For example, in the following description, forming the second component above the first component may include an embodiment in w...

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Abstract

An embodiment of the present application provides an electronic device, an ultrasonic fingerprint identification device and a manufacturing method thereof, the method comprising: forming a first piezoelectric layer and a second piezoelectric layer that are horizontally distributed and isolated from each other on the top of the base layer; The electrical layer has a specific piezoelectric strain constant, and the second piezoelectric layer has a specific piezoelectric voltage constant; a first planar electrode is formed on the top of the first piezoelectric layer and the second piezoelectric layer; a resonant cavity is formed on the base layer, And form a second planar electrode and a third planar electrode insulated from each other in the resonant cavity to form the first device; the first planar electrode, the first piezoelectric layer and the second planar electrode are used to realize ultrasonic emission, the first The planar electrode, the second piezoelectric layer and the third planar electrode are used to realize ultrasonic reception; the first device is integrated with a matching semiconductor device to form an ultrasonic fingerprint identification device. The embodiments of the present application can improve the loop efficiency and identification sensitivity of the ultrasonic fingerprint identification device.

Description

technical field [0001] The present application relates to the technical field of ultrasonic fingerprint identification, in particular to an electronic device, an ultrasonic fingerprint identification device and a manufacturing method thereof. Background technique [0002] In the ultrasonic fingerprint identification technology, the main function of the ultrasonic fingerprint identification device is to convert the excitation signal into an ultrasonic wave and emit it in a direction perpendicular to the fingerprint, and at the same time receive the ultrasonic wave reflected by the fingerprint and convert it into a corresponding electrical signal. Therefore, the design of the ultrasonic fingerprint identification device is very critical. [0003] In the design of ultrasonic fingerprint identification device, the preparation of piezoelectric material is also a key point. The piezoelectric materials currently used are generally AlN, lead zirconate titanate piezoelectric ceramic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 不公告发明人
Owner SILEAD
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