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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11430941 B1

PDFFull Text
Date of Patent:
Aug. 30, 2022

Filed:

Apr. 25, 2019

Piezoelectric polyvinylidene fluoride material, method for manufacturing same, and fingerprint recognition module

Applicant:

Wuhan China Star Optoelectronics Technology Co., Ltd., Hubei, CN;

Inventor:

Yongxiang Zhou, Hubei, CN;

Assignee:

Wuhan China Star Optoelectronics Technology Co., Ltd., Hubei, CN;

Attorney:

Benesch, Friedlander, Coplan & Aronoff, LLP

Primary Examiner:

Khanh T Nguyen

Int. Cl.
CPC ...
H01L 41/193 (2006.01); C08K 3/04 (2006.01); B06B 1/06 (2006.01); C09D 7/61 (2018.01); C09D 7/20 (2018.01); C09D 7/40 (2018.01); C09D 7/45 (2018.01); C09D 7/63 (2018.01); C08F 14/22 (2006.01); C08K 3/08 (2006.01); C09D 5/24 (2006.01); C09D 127/16 (2006.01); H01L 41/257 (2013.01); H01L 41/45 (2013.01); G06V 40/13 (2022.01);
U.S. Cl.
CPC ...
H01L 41/193 (2013.01); B06B 1/0688 (2013.01); C08F 14/22 (2013.01); C08K 3/041 (2017.05); C08K 3/08 (2013.01); C09D 5/24 (2013.01); C09D 7/20 (2018.01); C09D 7/45 (2018.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01); C09D 7/70 (2018.01); C09D 127/16 (2013.01); G06V 40/1306 (2022.01); G06V 40/1329 (2022.01); H01L 41/257 (2013.01); H01L 41/45 (2013.01); B06B 2201/70 (2013.01); C08K 2003/0831 (2013.01); C08K 2201/001 (2013.01); C08K 2201/011 (2013.01);
Abstract

A piezoelectric polyvinylidene fluoride (PVDF) material, a method for manufacturing the same, and a fingerprint recognition module are provided. The polyvinylidene PVDF material includes PVDF, a first solvent, a second solvent, a fluorosurfactant, and an inducing material. Material of the inducing material is one of carbon nanotubes, carbon black, and gold nanorods. Because of the high anisotropy of the inducing material, molecular orientation of the PVDF material is induced, thereby improving piezoelectric performance of the piezoelectric PVDF material. Problems of conventional piezoelectric PVDF materials, which are used in ultrasonic fingerprint recognition modules, such as poor piezoelectric performance and high-energy loss are improved.

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