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Color eink will never match LCD or OLED because at best either about 4000 dark shades/hues/colours needing front light or 4000 washed out shades.
OLED/LCD is 32,000 for rubbish panels and 16,000,000 approx or more for decent ones.
The eink cell is only black, white and 14 shades of grey. Colour also reduces the 300 dpi to either 150 x 150 or 100 x 300.
Some completely different technology not based on current eink would be needed.
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