Setting up a TV display for accurate colour poses a few more difficulties than with your computer monitor.
Datacolor have produced a version of the Spyder4 monitor calibrator to address this for TVs and projector based systems (front and back projection).
It takes a bit of experimenting to get it right, but it’s very easy to use.
The main difference is that the software can’t directly set up the TV, so you have to select test patterns directly from a DVD or Blu Ray disk (supplied)
Attaching the Spyder4TV HD to the front of my TV