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Re:Open source “split-flap” mechanical display by gattilorenz on Monday April 19, 2021 @04:46AM (#26860377)
similarly to an e-ink display, it doesn't take energy to show the current/last status, it's required only for transitions. If there's a blackout, the display is still visible.
Re:Open source “split-flap” mechanical display by goodpoint on Monday April 19, 2021 @09:37AM (#26862594)
> If there's a blackout, the display is still visible

And dangerously out of date in airports and train stations.

When they break down they had to be covered to prevent misleading passengers.