Show your own pictures on one or several Samsung Frame TVs in Art Mode, switched from one web page, with no media player or USB stick.
LG webOS TVs can show a full-screen slideshow, video included, in their own browser. DisplayValet opens it, keeps it in front and turns the TV on and off.
A Fire TV stick turns almost any TV into a display that plays pictures and video. DisplayValet runs it and can sleep and wake it on a schedule.
Put two, three or more TVs side by side and switch them together: a different picture on each, or one scene spread across all of them.
Set each TV's opening hours once; DisplayValet turns it on in the morning, off at night, and back on if someone switches it off during business hours.
Any device with a modern web browser can show a DisplayValet slideshow: open the display's address full screen.
Install on one always-on Windows computer, find your TVs, put them in screens, add pictures, start. About ten minutes.
The usual causes when a TV isn't found, says Not responding, or keeps asking to Allow, and how to fix each.
Everything unlocked, any number of displays. No card needed.