I've heard that with a TV, the resoltion that you should use is quite low. A monitor is often made to display images with pretty high resolutions. I wonder if the TV signal will be able to give the same image quality since TV signals tend to be a much lower resolution. (720x480 or something like that, I think.)
But if all you want to do is play a video on your laptop and view it on your TV, the quality should be good enough.