Chromecast sounds perfect for your needs.
frankspin - Thanks for your reply. However Chromecast will only transmit apps, e.g. Netflix, and Chrome Browser pages. It doesn't cast whatever is on the laptop screen. (As far as i can workout)
Ah ok, wasn't sure what you meant when you said laptops/desktops. I have see modules that are wireless, but they're often bulky requiring line of site for the two modules.
It is quiet difficult to get what you need, chromecast is the closest I can think of too.
If anyone knows something better, would help me too. Lets wait and see.
There seems a kind of device called Android TV box or Android TV dongle which can turn your TV into a computer or smart TV. Via it, you can surf internet, reading mails on your TV, etc. I'm not sure whether these are what you want to achieve or not.