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One thing I don’t understand - why are the iPhone screens that can run in display mode run at 1hz a feature - what’s hard about driving a display typically driven at 120hz(?) at 1hz to save on power difficult? Or it’s not and the it’s a differentiating feature price.

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Is the refresh really a big power draw vs the backlight or even the pixels themselves? I think the thing about e-ink is that it's a chemical producing/retaining the pigment, rather than a light source. So even when it's off, it retains its current colors. When a LED is off, it's just... nothing.

But you still have a point. Even if a LED display has "only" a 2 or 3 day battery life, that's still pretty huge to mere hours.

How do smart watches (like the Garmins with 1-week batteries) do it?

The Garmin watches with 1+ week battery life have memory-in-pixel displays. Like E-Ink, this seems like another technology that could be amazing if they were available in larger sizes with lower prices.

> How do smart watches (like the Garmins with 1-week batteries) do it?

https://sharpdevices.com/memory-lcd/

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