A lot of these systems are just displaying a web page which makes it very easy to move to Linux. I know a lot of the transport ones are simple static web pages

A lot of these systems are just displaying a web page which makes it very easy to move to Linux. I know a lot of the transport ones are simple static web pages on auto refresh. I built some smarter screens which use AJAX and JavaScript which is less jarring when it updates. I've changed a set of digital signs from running full screen IE on windows (with very long VGA cables) to chromium on Raspberry Pis. The new system behaves a lot better but there were lots of little things to tweak to get it running well. I wrote a short blog post with all the relevant configuration: https://shutdownscanner.com/Blog/Posts/Raspberry-Pi-Digital-Sign https://shutdownscanner.com/Blog/Posts/Raspberry-Pi-Digital-... A lot of the new TVs are smart and come with a built in android browser so you don't need anything else. We have one of these and run Pis on all the existing dumb TVs.