Yeah, it's possible with with a laptop.

You'll just want to make sure that you are using a high-def connection from the laptop.

You'll get the best results from:
HDMI then DVI
or SVIDEO as a last resort ( << slightly lower quality than the other two)

Any other connection will be analog to digital which will result in the hdtv showing off all the flaws in the analog signal.
Which doesn't look too nice.