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My Panic PlayDate, which lacks the paper-like contrast of e-ink but can refresh at 50 fps, looks fantastic in direct sunlight. I believe it’s using a Sharp Memory LCD.

So there is other tech for this.



But it's just black and white, right? Still, that sounds promising.


Yes, and the pixels can only be either black or white, not shades of grey. (Although dithering is surprisingly effective.)

My Pebble Time Smartwatch had a color memory LCD which was also easy to read in direct sunlight, but the PlayDate's screen looks a lot better.




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