The fingerprint sensor on a smartphone is now taken for granted. It has become such a common sight these days on smartphones that its presence goes mostly unnoticed. But its reliability of securely authenticating the owner is unparalleled by far, even with the advent of facial unlock and iris scanning. It remains to be the most intuitive and easiest way of unlocking and authenticating. But in the journey to give the display up front more real estate, the fingerprint sensor has been pushed around a lot. From being embedded in the home button, it got shifted to the back. Some even placed it along the edges, embedded in the power button while some removed it altogether.

While the first fingerprint sensor was introduced by Apple in the iPhone 5S, it’s a Chinese company that found the answer to keep the fingerprint sensor at its rightful place and not compromise with the screen real estate. Vivo raced to be the first phone to tout an in-display fingerprint sensor that doesn’t mess with the aesthetics up front. The Vivo X21 has the sensor embedded inside the OLED panel. Sounds cool, right?
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https://www.digit.in/features/mobile-phones/vivo-x21-first-impressions-quite-generic-if-not-for-the-in-display-fingerprint-sensor-41287.html