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RLCD has been around for ages. It's only useable in reflective mode in very bright light, such as direct sunlight, otherwise it needs the backlight.
The eink is front lit, but uses LEDs if the ambient light isn't enough. Colour eink needs the LEDs.
There are LED & OLED as good or better than eink in situations where the eink needs the front light (almost always for colour models).
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