Okay, I'll have to figure it out myself. I did take a quick look at 240Hz processing and it appears from
this article that the 240Hz sets beginning to appear use two different ways to get to 240Hz: "true 240Hz" sets in the article's terminology calculate and then interpolate three extra frames between each original one; others interpolate one frame to get to 120Hz and then cycle the backlight very rapidly to insert two dark frames to total 240. Both types are for the purpose of reducing rapid motion blur, e.g. in sports. Either 120 or 240 is of course evenly divisible by the 24 frames per second motion picture rate for the separate question of showing that properly on TV.
Charles, you might also enjoy Ken Pohlmann's(who apparently, in contrast with Dan Rather, does know the frequency)philosophical/technological
take on the subject.
