Design and Fabrication of an ultra-thin under-display fingerprint sensor

Wei Jei Peng; Jhe Syuan Lin; Yuan Chieh Cheng; Ming Fu Chen; Wen Shing Sun

doi:10.1117/12.2573621

Design and Fabrication of an ultra-thin under-display fingerprint sensor

Wei Jei Peng, Jhe Syuan Lin, Yuan Chieh Cheng, Ming Fu Chen, Wen Shing Sun

Department of Optics and Photonics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Recently, the phones with high screen-to-body ratio are popular in the market, and it leads to the demand of in-display fingerprint recognition. The optical fingerprint sensor is based on frustrated total internal reflection (FTIR), and the camera type independent on the panel process is cost-effective and with high yield rate. To meet the volume constraint of the smart phone, a miniaturized compact lens is designed. For maximizing the sensing area in the limited space, the field of view can reach 128°. To increase the accuracy and speed of the recognition, the design has extremely small distortion and low f-number. Mostly importantly, the resolution should be sufficient for the fingerprint extraction algorithm. To achieve the specifications, the lens is designed with three aspheric plastic lenses using injection molding. In this paper, the procedure of optical design, mechanical design, lens fabrication and assembly of the prototype is presented. Finally, the prototype is employed for fingerprint identification.

Original language	English
Title of host publication	Optical Design and Testing X
Editors	Yongtian Wang, Tina E. Kidger, Osamu Matoba, Rengmao Wu
Publisher	SPIE
ISBN (Electronic)	9781510639119
DOIs	https://doi.org/10.1117/12.2573621
State	Published - 2020
Event	Optical Design and Testing X 2020 - Virtual, Online, China Duration: 11 Oct 2020 → 16 Oct 2020

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11548
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Optical Design and Testing X 2020
Country/Territory	China
City	Virtual, Online
Period	11/10/20 → 16/10/20

Keywords

Fingerprint identification
Frustrated total internal reflection
In-display fingerprint recognition
Injection molding
Screen-to-body ratio
Ultra-thin fingerprint sensor

Access to Document

10.1117/12.2573621

Cite this

Peng, W. J., Lin, J. S., Cheng, Y. C., Chen, M. F., & Sun, W. S. (2020). Design and Fabrication of an ultra-thin under-display fingerprint sensor. In Y. Wang, T. E. Kidger, O. Matoba, & R. Wu (Eds.), Optical Design and Testing X Article 115481G (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11548). SPIE. https://doi.org/10.1117/12.2573621

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abstract = "Recently, the phones with high screen-to-body ratio are popular in the market, and it leads to the demand of in-display fingerprint recognition. The optical fingerprint sensor is based on frustrated total internal reflection (FTIR), and the camera type independent on the panel process is cost-effective and with high yield rate. To meet the volume constraint of the smart phone, a miniaturized compact lens is designed. For maximizing the sensing area in the limited space, the field of view can reach 128°. To increase the accuracy and speed of the recognition, the design has extremely small distortion and low f-number. Mostly importantly, the resolution should be sufficient for the fingerprint extraction algorithm. To achieve the specifications, the lens is designed with three aspheric plastic lenses using injection molding. In this paper, the procedure of optical design, mechanical design, lens fabrication and assembly of the prototype is presented. Finally, the prototype is employed for fingerprint identification.",

keywords = "Fingerprint identification, Frustrated total internal reflection, In-display fingerprint recognition, Injection molding, Screen-to-body ratio, Ultra-thin fingerprint sensor",

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Peng, WJ, Lin, JS, Cheng, YC, Chen, MF & Sun, WS 2020, Design and Fabrication of an ultra-thin under-display fingerprint sensor. in Y Wang, TE Kidger, O Matoba & R Wu (eds), Optical Design and Testing X., 115481G, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11548, SPIE, Optical Design and Testing X 2020, Virtual, Online, China, 11/10/20. https://doi.org/10.1117/12.2573621

Design and Fabrication of an ultra-thin under-display fingerprint sensor. / Peng, Wei Jei; Lin, Jhe Syuan; Cheng, Yuan Chieh et al.
Optical Design and Testing X. ed. / Yongtian Wang; Tina E. Kidger; Osamu Matoba; Rengmao Wu. SPIE, 2020. 115481G (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11548).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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