I think there is confusion about what "curved screen" is referring to.
Some people are using the term "curved screen" to mean a fully curved screen, like the curved TVs/monitors - like mockup A below, and that old patent.
Others use the term to mean curved at the edges, as already present on some other phones. And like mockup B below.
I think most people agree A looks silly.
And B is okay, but seems pointless. The display being curved at the edges just renders that strip of display distorted and vulnerable to reflections.
And it is also important to distinguish whether you mean the display is curved at the edges, or just the glass.
The glass is already edge-curved on the 6 & 7 series iPhones. That "2.5" thing that is sometimes mentioned.
But the display stops short of the curve.
If the plan for the new iphone is to have the display part also curved at the edges, as well as the glass, then that would look like B above.
I wonder if someone could come up with some better terminology for these different things that all seem to be labelled "curved screen" in reports and posts.? Perhaps "full" or "edged", and "glass", "display" or "both". Rather than just "curved screen" which could mean different things.