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I seem to remember some developing technology that promised this a couple of years ago. I haven't seen this in the real world though. But I haven't gone looking for it either.
You would still need power to change the photo being displayed. So a dead battery might have the device continuing to display its last photo, but you couldn't change the photo until you put a new battery in it. Which kind of negates the benefit of a "battery free" display.
If you have some photo you want to leave unchanged for a long time and not require a battery for displaying it, it's cheaper and easier to just print it.
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