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I just wish it was possible to build a version of the Frame TV that didn't still use 30% power while in "picture mode" but instead used a color e-ink display like this to cover the screen with art/photos when not in TV mode.

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It is a cool idea, but creating that would require you to put a color e-ink display over the normal display panel, which may cause it to look washed out/lose crispness.

I think it is technically possible, I'm just not sure many would accept the cost/functionality trade-offs. But I may be wrong.

I think the idea parent comment had is to use the rollable technology from the article so that it only overlays when not in use.

Yes! This is the perfect use case for Photo frames, or even for advertising billboards where there's no need to have humans change the advert.

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