Yes, they make such things - an HDTV set that's meant to be mounted and watched in your backyard. They never used to need something like this in the days when we had portables, but you can hardly lug a huge 85" set onto your deck. 

So now they're making them specifically for that purpose. 

I've actually seen this in my own neighbourhood. A resident whose property backs onto a medium-sized park near my house has one under a canopy in his backyard. I don't think I've ever seen it turned on when I've been walking there, but it remains on the wall near his patio. I found it so strange, I couldn't stop staring at it. (Maybe it's my area, but another guy has a TV set mounted to the wall inside his garage.)

I've watched TV outside, too, but on my portable laptop. There's no way I'd go to this trouble and expense just to see a show in the nature. 

So what do these things look like, how much do they cost and can you actually see them in the great outdoors when the sun is shining? Here's a review.

Outdoor TV review, tested in direct sun and storms