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Nxtpaper models are variously LCD or OLED. QLED is possible. Older phones & tablets I had got hot from CPU. Current ones don't.
Kaleido 3 on Carta 1300 needs the front light on to be as white as Carta HD or Carta 1200 with light off and decent ambient indoor light. It's darker than Pearl eink. it's inherently poorer contrast due to reflections from the coloured dots. Certain fonts and images can have coloured stripe artefacts at 300 dpi. It depends on your perception.
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