Digital Signage
There are a number of ways to make a TV screen usable as digital signage for your church (for usage in the narthex, social hall, etc.):
Have a Wifi TV? Use Chromecast, MiraCast, Chrome SignBuilder, or AppleTV (Tutorial on how to connect content through your AppleTV.)
Non-Wifi TV? Some smart or non-smart TVs can just load and loop content off a USB stick, but then you have to unload the stick to change content. Alternatively, check out the ViewSonic NMP-302w for a wireless connection to your PC with a centralized interface. Dynamic content including video streaming, web-based content, RSS feeds, etc and can be programmed on a schedule (i.e., show different things on Sundays than during the week).
Raspberry Pi is a device that pairs with display software or a kiosk app (Example from Binary Emotions). With Raspberry Pi, you can load Microsoft 10 Internet of Things (IoT) OS to provide a kiosk app. Or, you can use screenly.io for even more robust tools. YouTube Tutorial Video
A little known, tiny media player called the Micca Speck G2
For multiple screens and a customized professional solution, check out BrightSign (Products start at $450).