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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
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(6), 2188;
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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