Some years ago there was this „paperlike kindle“ that was advertised with: „you can read it in bright daylight!“ and then we never heard about this invention again.
Edit: thanks for your input. I think I understand now.
In simplest words, those technologies have very poor display capabilities — low refresh rates, poor colors, and images can appear pixelated. We are all used to seeing crisp colors with higher refresh rates and smooth animations, so not much people buy those phones.
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