That depends on what you want it connected to. if you just want to surf the internet, you can just do that with Wi-Fi.
I use my LG Smart TV to surf the web all the time without actually connecting it to a computer and just using the Wi-Fi.
And, this is only for LG but if you want to connect it to a computer wirelessly to stream HD movies, you can use this thing called WiDi.
Here's the link that'll explain what it is. http://www.worldtvpc.com/blog/lg-smart-3dtv-widi-builtin-easy-wireless-streaming.