Okay, I understand now. Yeah, I don't want a 'second screen' as I don't want to move Windows. I simply want to connect my MBP screen to my Samsung LED without a wire (without HDMI) so I guess ATV does what I am looking for it to do.
I'm not sure why you suggested me AirParrot? From your explanation, I think ATV will mirror my MBP screen onto the Samsung LED that I have and I'll be able to watch movies, surf the web etc. just as I can with an HDMI cable.
he suggested airparrot since the airplay display is a somewhat new feature he didn't know about.
you don't want to do airplay display to watch movies, it will be jerky and stutter.
surfing the web should be OK, as are things where large portions of the screen aren't chaining at the same time.
airplay display has to wait for an image to be on the screen, it then looks at the computer screen, re-encodes it, and sends it to the aTV in near real time. They have sacrificed quality for speed.
for watching movies, i suggest something like
beamer, as it will take the file and play it directly on your aTV.
If it needs to it will re-encode the file, but since it can read ahead, it's a better image on the output.
you have to select the videos with the beamer app on your mac.
another option is
plex, (what i use) its free (with an upgrade option for certain features), It's more of a media server than just to play random files, so you would point it at your folder of movies or TV shows, it then scans them, and you select what you want to watch on the player (there's versions for all the streaming devices like aTV, roku, fire stick, as well as a lot of smart TVs, and your android or iOS devices)
it does take a little more organization in how your files are stored, so that it can figure out what's what, but it's a "richer" experience on the playback side.
Once set up, it's similar to netflix on the playback side, with all your media with thumbnails, and descriptions.