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Nxtpaper is an especially good matt surface for OLED or LCD. I read that the early versions were not quite bright enough for direct sunlight. My OLED Nxtpaper 40 (4G version, not 5G version) phone and LCD Nxtpaper 11 tablet are both bright enough for direct sunlight at Auto or 100%. Typically 10% to 20% indoors and 50% in the shade on a sunny day.
I'd only need to use a phone in direct sunlight, for a text, call or photo. I sit in the shade to read outdoors, though I'd rarely read outdoors.
IMO ability to use the screen in direct sunlight only applies to me for a camera or phone. The Nxtpaper 40 is OLED, so not as as bright as some LCDs but better in sunlight than most of my LCD phones/cameras. The Nxtpaper 11 is LCD.
They both are Nxtpaper 2.0. The Nxtpaper 10 might not be so bright. The Nxtpaper 14 & 14 pro seem to be nxtpaper 3.0
Such technology (ultra matt) is over 40 years old but was rare on CRTs. The matt flat CRTs could easily have the coating scratched. The Nxtpaper must be some kind of micro-etched dark glass as it's more durable. Such dark tinted matt layers for CRT, Plasma, OLED or LCD attenuate ambient light reflected off the internal display twice as much as the display emission and are usually polarised. The Nxtpaper screen can go totally black via a quality camera polariser.
Such technology can't be used with eink as it works best with unfiltered polarised ambient light, though the eink screen top layer is usually microtextured to reduce shine/glare/reflectance, the NxtPaper 2.0 surface is dramatically better at reducing glare and diffusing image of reflected sun or lamp.
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