Linux/Raspberry Pi (maybe?) oriented "digital wall" display for news, events, etc.
Hello friends. A question came up today and I'm not too sure what out there exists for this. Reason like this make me wish there was a tech oriented Pinterest (or maybe there's a sub category on Pinterest for tech?). Ha, anyway, so the idea is this. I'm looking for the ability to be on a tablet (within wifi range) or laptop with a web frontend that can control the text input being displayed on a screen inside the building.
Think of this use case scenario...
I am standing outside. I have a device in my hand on the wifi with the web interface pulled up and logged in. Little Johnny's mom is here. I hit a button and it displays on the flatscreen TV mounted on the wall inside that Johnny Ramone is dismissed.
I've heard of projects being done where people put Raspberry Pi's on the back of TVs and feed them the signal via HDMI, and then over the network these Raspberry Pi's are controlled by a centralized mini server of some sort. I just have *no* idea what that software is and am having a hard time with my blind fire Google searches. Figured I'd ask here in case anybody was like "aw yeah totally I just did this with A+++ results."