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Ultrasonic fingerprint identification sensor, preparation method thereof and display device

A fingerprint identification and ultrasonic technology, which is applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, instruments, etc., can solve the problems of small vibration amplitude and affecting the detection sensitivity of ultrasonic fingerprint identification devices, etc.

Active Publication Date: 2019-09-13
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This fingerprint identification method requires the vibration of piezoelectric materials to emit sound waves and form electrical signals for fingerprint identification. However, the vibration amplitude of piezoelectric materials in existing ultrasonic fingerprint identification devices is small, which affects the detection sensitivity of ultrasonic fingerprint identification devices.

Method used

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  • Ultrasonic fingerprint identification sensor, preparation method thereof and display device
  • Ultrasonic fingerprint identification sensor, preparation method thereof and display device
  • Ultrasonic fingerprint identification sensor, preparation method thereof and display device

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Embodiment Construction

[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0040] figure 1 It is a schematic structural diagram of an ultrasonic fingerprint recognition sensor according to an embodiment of the present invention. Such as figure 1 As shown, in order to improve the detection sensitivity of the ultrasonic fingerprint recognition sensor. The present invention provides an ultrasonic fingerprint recognition sensor, comprising a receiving electrode 1, a driving electrode 2, a piezoelectric film layer 3 arranged between the receiving electrode 1 and the driving ele...

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Abstract

The embodiment of the invention provides an ultrasonic fingerprint identification sensor, a preparation method thereof and a display device. The ultrasonic fingerprint identification sensor comprisesa receiving electrode, a driving electrode and a piezoelectric film layer arranged between the receiving electrode and the driving electrode, the ultrasonic fingerprint identification sensor further comprises a resonant cavity, and the resonant cavity is located on the side, close to the piezoelectric film layer, of the receiving electrode and used for increasing the vibration amplitude of the piezoelectric film layer so as to improve the detection sensitivity of the ultrasonic fingerprint identification sensor.

Description

technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to an ultrasonic fingerprint identification sensor, a preparation method thereof, and a display device. Background technique [0002] Ultrasonic fingerprint recognition technology uses the ability of ultrasonic waves to penetrate materials, and produces echoes of different sizes with different materials (that is, when ultrasonic waves reach the surface of different materials, the reflected ultrasonic energy and the distance traveled are different) for fingerprint identification. Yes, compared with capacitive fingerprint recognition devices, ultrasonic fingerprint recognition has better performance, and has the advantages of waterproof and sweatproof, large sensor area, false fingerprint recognition, and thicker cover. Therefore, ultrasonic fingerprint recognition technology can distinguish the location of fingerprint ridges and valleys by using the difference in a...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/1306G06V40/1329H10N30/802H10N30/2047H10N30/302H10N30/874H10N30/704
Inventor 刘英明王海生丁小梁王雷王鹏鹏
Owner BOE TECH GRP CO LTD
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