I was in a local supermarket and noticed that a shelf label was glitching. What I thought were actual paper labels were in fact ESLs, aka Electronic Shelf Labels. These mini screens make use of e-ink with 1-4 colours and a long battery life to, in theory, save time and costs changing labels with promos, discounts, new stock, and so on. Instead of having to wander around the store changing printed labels it’s all done from a central computer.
A couple of the labels were on the fritz, alerting me to what they were. They were flickering random pixels like a faulty phone screen. When I got home I did some light research. These particular ESLs were manufactured by a company called Pricer. They are controlled via IR from hubs mounted in the ceiling with line-of-sight like a TV remote. Central software named Pricer Plaza allows you to monitor and update the ESLs from the store PC.
I looked into the security in play. Encrypted comms, auth keys etc. The usual fare. There had been some reported hacks. Changing prices, arrow keys with this way messages, naughty stuff. There was even a few cases of ramsomware, but mostly defacement of some kind. Kids having fun. Like the days when smart watches first appeared that could control TVs and TV stores were constantly having to deal with the display models having their channels changed. More an annoyance than anything clever.
I’m not sold on ESLs being better for the environment. It’s probably just more tech that will eventually end up in a landfill. Still, it may be fun to play with.