I want to be able to see my laptop's screen on my 46" LCD TV. Is there
a cheap way I can do this wirelessly and, if so, how?
Connect a video camera to the TV, focus and point it at the laptop
screen. There you go! Wireless
If you just want to watch video files you have stored on the laptop, a
network connected media player would be a solution to access the laptop
drive via WiFi. Cheap, you might have one already built into your TV if
it advertises itself as "Smart" or DNLA, or similar built into connected
Blueray or PVR equipment.
There are also software methods about (e.g VLC) to turn a computer
display into a video stream, that may also be rendered by such a media
player. Won't be the best in responsiveness as there will be a delay for
encoding the stream - so useless for gaming.
And then there's wireless HDMI....