Judder:
In Short: Judder is the result of Film, that is shot in 24 fps (frames per second), but is displayed in a frame rate that is not even multiples of 24 (like 30 or 60).
In Not so short:
http://www.hometheaterhifi.com/volum...e-10-2000.html (See the section entitled "
Re-Interleaving 24fps Film")
Motion Blur:
In Short: TV can't keep up with the fast moving images. The motion is blurred.
In Not so short:
http://en.wikipedia.org/wiki/Motion_blur