A few days ago I saw a bus sign in Sydney that I'm pretty sure used e-paper. Monochrome, it refreshed about once a minute and flashed a negative image when it did. First time I've seen e-paper used except on a ebook tablet.
Looked it up and yes, they are e-paper:
https://www.sixteen-nine.net/2018/07...ey-au-rollout/
Quote:
The displays use eInk technology developed by the Slovenian firm Visionect and a design by Australia-based Mercury Innovation. You can think of these units as nicely packaged and ruggedized Kindles, in terms of the core concept.
The bus stop signs are run entirely off solar panels, and are IoT-connected using mobile networking or WiFi. The panels are updated in real-time, in part, by GPS tracking information for buses.
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