What i don't understand though is how much difference is there between 120hz and 240hz? Marketing lang ba or may lamang talaga?
Konti lang ang difference, hindi masyadong mapapansin.
I'm now interested to find out if it does at all matter or not, i tried to do my own research and came to a conclusion that its about motion refresh rate, baka mali intindi ko so please corect me.
The short answer is that it's about frames per second. As you know, a movie is not a real moving picture, but a series of sequential still pictures shown so fast that you get the illusion that you're looking at a real moving picture. A movie is shown at the rate of 24 fps (frames per second). They convert that to 60 fps for NTSC video format (which is actually 59.94 fps progressive and 29.97 fps interlaced). Then they insert additional frames and increase that to 120 fps (60 x 2) or 240 fps (60 x 4), which they call 120 Hz and 240 Hz.
The long answer is that 120 Hz and 240 Hz are motion interpolation technologies. Movies are originally filmed at a rate of 24 fps, then shown in the movie theater with a double or triple shutter to reduce flicker. Since the frame rate of 24 fps is relatively slow, you will see motion judder especially when the camera pans horizontally. There's nothing wrong with that effect, since that's natural for 24 fps film presentations.
However, when 24 fps is converted to 60 fps video format, the judder gets worse. It's no longer the "good judder" of 24 fps film, it's now the "bad judder" of telecine conversion caused by slight pulldown errors in the process of converting 24 fps film to 29.97 fps NTSC.
Ostensibly to eliminate film judder in film-based video sources, LCD makers introduced motion interpolation technology. They insert frames in between existing frames and use software to effectively guess how the picture in those intermediate frames should look like.
Illustration:
Above: the original frames. Below: with interpolated intermediate frames inserted.
Does it eliminate judder? Yes.
Does it improve the picture? It depends on the viewer. Movie enthusiasts prefer to watch the original movie, including the original motion cadence. Removing the judder will alter the 24fps cadence and make the movie look like it was shot on home video Handycam, which ruins the original motion cadence of real 24fps film.
The US forums call it the SOE (soap opera effect). I call it the telenovela effect.
And don't think motion interpolation is perfect. The tech requires instant complex calculations, so it's not surprising that you'll see an occasional glitch. The most common complaint is the screen tearing artifact during motion. Here's an illustration:
