Dynamic behavior investigation of the piezoelectric PVDF for flexible fingerprint

Wen Yang Chang, Ying Hui Cheng, Shu Yuan Liu, Ying Chiang Hu, Yu Cheng Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This study reports a flexible technology for identifying the fingerprints using the piezoelectric polyvinylidene fluoride (PVDF) materials. The flexible PVDF has successfully developed to identify the fingerprints by an electric charge of the piezoelectric character. The fingerprint sensors were fabricated using the polymer MEMS (micro electromechanical systems) technologies and integrated into the flexible polyimide substrate. The study focuses on the 3D array fabrication for reducing surface tension of each PVDF pixel and the dynamic control circuit for acquiring the piezoelectric signals. Experimental results show the 3D array patterns by pressing on PVDF film have a good structure, and each pixel is more freedom that means the pixel is unrestricted on top surface and can reduce the couple effect of each pixel. The depth of micro array is about 15 μm and the response speed of the flexible fingerprint sensors are as fast as 5 ms. Therefore, the aim of this study is to speed up the technology for promoting the flexible fingerprint. The feasibility studies also show the molding transfer is an appropriate low-cost technology for fabricating of the flexible piezoelectric fingerprint sensor. Furthermore, the PVDF has a good mechanical strength and electrochemical stabilities for fingerprint sensor applications.

Original languageEnglish
Title of host publicationSmart Dielectric Polymer Properties, Characterization and Their Devices
PublisherMaterials Research Society
Number of pages8
ISBN (Print)9781604234053
Publication statusPublished - 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Dec 1

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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