Live X20 Plus UD was launched yesterday by the Chinese company Vivo, this being the first smartphone that has a fingerprint reader integrated into the screen. Vivo X20 Plus UD uses a technology of Synaptics to integrate the fingerprint reader in the screen, this being the first manufacturer that had the courage to offer such functionality for a smart mobile phone.
Vivo X20 Plus UD has a very interesting and "future" function for smartphones, but here it is already affected by a problem that those from Apple and Samsung probably also discovered. More precisely, the fingerprint reader under the Vivo X20 Plus UD screen will not work with any kind of film applied over the phone screen, but only with special ones.
Vivo X20 Plus UD will not read users' fingerprints through the screen if the protective film used exceeds a certain thickness, the Vivo company applies one from the factory over the phones to protect their screens. Users have no problems from the beginning using the fingerprint reader in the Vivo X20 Plus UD, but if they change the screen, either buy a film from the manufacturer or look for one of the right thickness.
It was expected that a too thick film would cause problems for using the fingerprint reader in the Vivo X20 Plus UD, and this could be a reason why Apple and Samsung did not implement the technology in their own phones. This limitation forces people to use foils that may not offer the protection or clarity they want for their own phones, but probably for ordinary Chinese this will matter less.
