Well McD uses Samsung's OHF series screens and I have yet to see sunlight diminish them. I expect other restaurants to adopt them or similar. Pretty much eating 200+ watts an hour in typical use for a 55 inch screen

https://displaysolutions.samsung.com/digital-signage/detail/...

I don't want to come off as a pedant, but "watts an hour" doesn't make sense in this context.

Watts are a unit of power, energy per time. Joules are a unit of energy. One watt is precisely one joule per second.

"Watts [per] hour" would be a change in power per time which is equivalent to an acceleration of energy and not an amount of energy.

To get an amount of energy, you multiply the power (watts) by an amount of time. If you want the energy in units of joules, you multiple the watts by the number of seconds in which the power was consumed. That's why kilowatt-hour a is a unit of energy; it's equivalent to one watt applied for one hour. One hour is 3600 seconds, so one kilowatt-hour is equal to 3600 kilojoules.

I believe you meant that the screens consume 200+ watts.

I actually enjoyed the clarification. Thanks for posting.

What's the lifespan of an e-ink display?

E-ink only actively uses power while it's changing the content on the screen. Assuming you want a static image, e-ink can outlast that easily while using virtually no power. Mine lasts for five years now even though it's "on" the entire time (because even when it's locked, it displays a wallpaper).

Power isn’t the main issue I’d be concerned about re: “lifespan” for signage. I wonder more about how it handles long-term UV exposure, day-night temperature cycles, changing humidity, etc.