Is the screens are running a browser in KIOSK MODE. If you don't know this mode, then you need to step back from the choosing and implementation to get more seasoned folk on your team. By making this a web service you have many CMS to choose from and for some that would be Word Press (again, google what this is.)

With Word Press and similar you create your content and it will show, play on your kiosk machines as well as Android.