There was (still is?) a standard of pluggable computer interface into commercial displays. Like you'd get a TV with one or more bays where you'd populate with essentially a small computing blade with whatever capabilities you needed. Different inputs, chaining displays together, running signage apps, etc.

Cathode Ray Dude has a few episodes about them.

https://youtu.be/wRPDn5zPF7U

https://youtu.be/q9a3dCd1SQI?t=2006

They're called Open Pluggable Specification Modules.

https://www.touchboards.com/ops-pc-modules/