A leaked image from a private business event held by Samsung in China recently has shown off some of the display technologies that the South Korean company is working on. The four technologies mentioned in this instance are Fingerprint on Display (FoD), Haptics on Display (HoD), Sound on Display (SoD), and Under Panel Sensors (UPS).
https://www.notebookcheck.net/Leaked-Samsung-event-image-hints-at-a-Galaxy-S10-device-without-bezels-or-a-notch.343561.0.html