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Open AccessArticle

A Hidden Fingerprint Device on an Opaque Display Panel

Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan
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Appl. Sci. 2020, 10(6), 2188; https://doi.org/10.3390/app10062188
Received: 28 February 2020 / Revised: 15 March 2020 / Accepted: 16 March 2020 / Published: 23 March 2020
(This article belongs to the Special Issue Joint Special Issue With OPTIC 2019)
In recent years, fingerprint recognition has become more and more widely used in mobile phones. A fingerprint recognition device hidden under an opaque display panel designed based on a waveguide and frustrated total internal reflection (FTIR) is proposed and demonstrated herein. In order to meet the demand for a high screen ratio for mobile phone displays, we use a symmetrical zoom-in and zoom-out coupler design. With this comprehensive coupler and waveguide design, not only can fingerprint recognition be achieved using an opaque display panel, but it also meets the appearance requirements for a mobile phone with a high screen ratio. View Full-Text
Keywords: fingerprint recognition; optical waveguide; opaque display panel fingerprint recognition; optical waveguide; opaque display panel
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Lin, J.-S.; Sun, W.-S. A Hidden Fingerprint Device on an Opaque Display Panel. Appl. Sci. 2020, 10, 2188.

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