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Originally Posted by Cootey
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However, my Clara 2E is such a favorite ereader of mine, I am tempted to upgrade it with a higher res screen.
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There hasn't been a higher resolution screen on eink since about 2014, the E Ink Carta HD. The prior Carta was 212 ppi, in january 2013.
Kindle 2014, Voyage, just before Paperwhite 3 (300 ppi)
Kobo 2015, Kobo Glo HD.
Carta was the first to use "regal" waveforms which reduce ghosting and thus less full freshes needed (slow and a black flash).
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The original E Ink Carta display was renamed to Carta 1000, and refinements in Carta 1100 and Carta 1200 improved response times and display contrast.[52] A later refinement in Carta 1250 improved response times and contrast again.
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One of the methods to help contrast is combining the the capacitive touch on the panel to reduce layers by at least one. Not sure if that's 1200, 1250 or 1300.
As the Voyage with Carta 1000 (originally called Carta HD) is one of the best, yet first 300 dpi, it proves the versions since have marginal value to standalone percieved performance (not side by side comparison).
The original Vizaplex was poor (Kindle 2007), and Pearl in 2010 (Kindle Keyboard /Kindle 3 and DXG) has pretty good contrast, but is slower than Carta and doesn't have "regal". Apart from the resolution it's not a bad reading experience.
The Kobo Mini and Sony PRS350 are 5″ rather than 6″, but the same number of pixels, so are higher resolution than Kindle Touch at 200 pp rather than 167dpi. I think also Pearl. My 5″ PRS350 is still pretty good.
The 2012 Kobo Glo 6″ is allegedly Pearl 1024x768 213 ppi. The Kindle Basic continued to be 167 ppi even on the 2019 model release with added front light. The current Kindle "basic" is a little like the Paperwhite 3, having finally 300 ppi.
So really E Ink Corp ink basic technology is matured since 2014, ten years ago. The changes since are tinkering and minor refinements. Triton was simply using the filter used on a mono LCD for colour. Kaleido is a more expensive to tweak using a filter optimised for mono eink.
It's taken them a long while to upgrade approximately 10″ to 300 dpi.
The ACeP, now at Gallery 3 is a different technology for signage, unsuitable for ereaders.
No doubt the Voyage used a too expensive set of top layers to achieve the clarity and contrast.
Hence new models more about USB-C, or more storage, or note taking or audiobooks (pointless on eink) than a better reading experience.