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Reflective LCD is really old. Maybe 20 years. It's an advantage in direct sunlight. In ordinary light it's poorer than OLED or regular LCD.
The only advantage over eInk is colour, but some forms of it are monochrome in direct sunlight.
It's inferior to eink for monochrome and takes much more power even if image is static. The eInk panel takes no power when static.
RLCD's only advantage is over LCD or OLED is in direct sunlight. Totally inferior to eInk for reading monochrome.
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