In my opinion it‘s not in all cases true that the eink-Carta screens have more contrast than the older eink-Pearl screens. I had different ereaders with Pearl screens (Sony PRS-T2, Sony PRS-505, Kobo Glo, an older Icarus Reader) and they had huge differences. By far the best contrast had the Sony PRS-T2 which I still have. Comparing side-by-side its screen has about the same contrast as the Kobo Aura H2O first ed., which has an infrared sensor too. Both the PRS-T2 and the Kobo Aura H2O have a remarkably brighter background than the Kobo Aura One (eink-Carta, capacitive sensor).
Personally I don‘t like the frontlights because too long reading with it in my case is one of the things that make migraine more likely.
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