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Roku has patented a way to show ads over anything you plug into your TV
(arstechnica.com)
This is a most excellent place for technology news and articles.
"dumb TV" is really just a commercial display. Usually the image isn't as good as a consumer display unless you really want to spend some money. For a decent display that won't wreck your bank account take a look at NEC displays. I have some in the field that are over 10 years old and used daily. Some even have compute modules you can add if you want your PC built into the display.
All I found in a cursory search were commercial displays. But I'll keep looking.
I've got a 30"? VISIO that's over 13 years old and doing just fine. I'd love to get another something of that quality; planned obsolescence sucks.