It may have taken time and hit various hurdles, but 2019 did, finally, see Samsung launch the first Galaxy Fold folding phone. And in 2020 we're expecting the Galaxy Z Flip, the clamshell foldable, complete with a whole new screen coating type.
Back in December 2019 we covered the announcement - as LetsGoDigital pointed out in its acquisition of a Samsung-made trademark application - that Samsung was set to claim Ultra Thin Glass (UTG for short, or Samsung UTG) as its own.
At the time we pondered whether this new glass was designated for a foldable device, as glass doesn't fold. Nowhere in the trademark application did Samsung make any specific regards to such foldables either - other than 'display for smart phones', but that could be any form rather than just foldables.
Now, according to Max Weinbach of XDA Developers, the Z Flip will have a 'crease' to negate this folding issue. Sounds like a potentially sensible solution to us.
We can also see why UTG would be used, as it's a lot more scratch-resistant than the screen covering on the original Galaxy Fold device. It also does away with the reflective quality that you'll see in POLED displays - that's Plastic OLED - such as that found on the Moto Razr.