Abstract
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.
Highlights
There are several biometric recognition systems that have been developed for applications in mobile phones, such as iris, facial and fingerprint recognition [1,2]
Optical fingerprint recognition (OFR) is the most widely used in access control systems because of its high image resolution and anti-spoofing capabilities [4,5,6,7]
OFR cannot be used on mobile phones with opaque type displays due to the following three main reasons
Summary
There are several biometric recognition systems that have been developed for applications in mobile phones, such as iris, facial and fingerprint recognition [1,2]. There are some optical methods to overcome opaque display panels, they cannot meet the requirements of high screen ratios. The integration of a waveguide into the cover glass of the mobile phone can solve the problem of it not directly being able to penetrate the opaque display, and the concept of FTIR is applied to the cover glass to enhance the contrast of the fingerprint image. Using the concept of optical projection magnification, the light beam diameter can reach the minimum diameter when entering and exiting the cover glass. This optical design concept can be applied used to meet the need for a high screen ratio
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