Outside you can pretty much forget about ANY residential TVs. It will simply be a waste of money.
Most TVs you see in the store are going to be around 350 cd/m2. This is plenty bright for in a home, but take it outside and you'll barely be able to see it, even in full shade during the day.
You can get some brighter TVs that are 700-1000 cd/m2. These can be acceptable in a shady area outside during the day. These typically won't have the very thin bezels you want for a video wall. While it may work, it'll still look like amateur hour.
So, that brings you back into the commercial realm. Your typical outdoor viewable TV will have a brightness rating of around 3,000 cd/m2 or more. the price though can get stupid expensive. We're talking $5k and up per screen for stuff that's bright enough to be visible outdoors, depending on size.
How big of a wall are you thinking of making? Something you may consider instead would be an LED video wall. While it may not give you the same level of detail that a TV would, from a distance, high resolution video walls can look quite nice, especially with properly designed graphics. If you shop the used market, you may be able to find something quite inexpensive. Video walls do NOT hold their value well, so you can pick up the older technology at a very reasonable price.