Sound on Display is a technology by which the audio associated with a display emanates from the screen itself, thus eliminating the need for inbuilt speakers. LG has demonstrated this innovation in TVs; now, Samsung appears poised to integrate it into smartphones. The OEM's take on this breakthrough may be showcased at CES 2019.
https://www.notebookcheck.net/Samsung-rumored-to-bring-Sound-on-Display-to-CES.387891.0.html