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Connecting a screen to a raspberry pi could be an idea

Power usage. It is fine for stationary stuff but no chance you gonna have that had any sensible battery life. And even if you get to like a day, having to remember to put yet another device on charger every day is PITA.

I actually was building kind of monitoring screen; idea was to just leave it connected to ethernet and boot off network so it doesn't have any problems with SD durability or need any installation in case I wanted to have more than one.

I currently have an old windows tablet on the wall, with fullscreen browser running and connected to a charger 24/7 - the power drain amounts to less than 10EUR a year. I'm looking into turning off the screen based on motion sensors, but... the payout just isn't as much as it seems at first.

I’ve got a raspberry pi in a touchscreen case that I bought for my 3D printer but frequently gets repurposed for home automation. When we have someone house sitting while we’re away I set it up with a dedicated Home Assistant screen so they can turn on the garage lights from the house.

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