A dying (or possible already dead) feature a mirco HDMI port on a tablet. I would consider getting a chomecast instead. what is it you want to do with this as a fire stick might be a better option depending on the app/video you want to put on the TV.
Alternatively buy a small lap top, download loads of videos onto it, then out put it on a flat screen monitor up to 32 inches or the tv. If the laptop does not have hdmi, get a VGA to hdmi cable for a few quid.
Another alternative is to buy a tablet with as big screen you can get, probably 10-12 inches.
...or how about looking at the feasibility of one of those android based laptops?