They are made for laptops, and I am sure they work there. There was a post here about 15days ago asking about unsmarting TVs but it has been deleted. That got me thinking about this solution.
Those boards you find on ebay are for driving laptop and tablet displays, not TVs. I doubt there is going to be an eDP or DSI connector in a TV.
The best options are to just never connect a TV to the internet, use a large computer monitor, or buy a commercial display if you don't care about picture quality.