AnandTech recently revealed some interesting information about the Galaxy S20 series 120Hz display. Specifically, both phones have a 120Hz refresh rate display function. But as we all know, when the Galaxy S20 series turns on the 120Hz refresh rate, the resolution is limited to FHD+. Although there was a little hope that Samsung may solve this limitation through a firmware update, from the new report of AnandTech, this may never be achieved.
The source said that although both the Galaxy S20 series and competitor OnePlus 8 Pro support a 120Hz refresh rate, the underlying technology is different in a key aspect. According to sources, the DDIC (Display Driver Integrated Circuit) of the Galaxy S20 series has only one MIPI channel. It limits the bandwidth. This bottleneck seems to be the main reason why the Galaxy S20 series cannot provide 120Hz refresh rate at QHD resolution. To achieve the bandwidth required to provide both 120Hz and QHD, the Galaxy S20 requires dual MIPI interfaces instead of single channels.
In this regard, the OnePlus 8 Pro has two MIPI interfaces. So the machine can turn on 120Hz refresh rate + QHD resolution at the same time.
In other words, the Galaxy S20 series is limited by hardware and can only support 120Hz FHD+ or 60Hz QHD. Firmware updates may not bring any changes.
As for the rest of the key features, the Galaxy S20 Ultra sports a 6.9-inch dynamic AMOLED display, a 12GB of memory and 128GB / 512GB storage space. It also has a “space zoom” function. In other words, the phone supports 100x hybrid zoom using a 48MP periscope telephoto system, which can provide a 10x optical zoom.
Terry Ts 
Rudhra Nandu