Although fingerprint scanners hiding underneath glass displays is quite the hot topic in smartphones these days, the dream isn't actually new. It has been around a few years back and some even had nearly working solutions. One of those is Qualcomm and it is now reminding everyone of that. At MWC Shanghai, the mobile chip maker will be showing off its latest ultrasonic fingerprint scanner running underneath the display of an actual commercial smartphone. And, in a way, it will be showing Samsung what it might be missing out on.