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not too long ago my friends and i were watching pineapple express. it was weird, it did not look like a movie. for a while we thought we were watching cops because it looked like a home video. certain scenes would look like a normal movie, while others just looked strange because it was 'too smooth'. anyone else notice this? is there a reason for it?
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120hz is simply doubling the refresh rate, from 60hz to 120hz.
In a nutshell (or the best I can explain it) is that the TV "inserts" a still image inbetween each normal frame. Now this inserted image cannot be a copy of the previous image, nor can it be a copy of the following image, or it would just be your normal 60hz.
So what the TV does is create what it thinks should be there from the two images that sandwich it. Sometimes the cpu in the TV gets it wrong, or slightly off, which creates an image problem referred to as "judder." It looks like a sudden jerky motion, and can often happen in high-speed images. I can see it VERY easily in the first Transformers, where the shot shows the shadow of helicopter blades against the sand.
FWIW, some people see the judder more readily than others, and from what I understand plasmas will not have this issue at all, due to their higher refresh rate over LCD TVs.
The smoothness you are seeing is the extra images that have been created, which "smooths" the transition between frames.
Some movies look AWESOME in 120/240hz, while others end up looking too fake (such as Pirates Of The Caribbean 2) due to the smoothing of the CGI.
So the tv makes its own picture out of the 2 its put between, which would make it look smooth
Kast to the rescue, knowing too much about tvs......
Just enough to get by.......I may have some of that wrong too, but essentially that is what it does. I am sure there are people on here that know much more and can get incredibly more technical than what I did.
Some brands do their 120/240 differently too. I think that LG does their 240hz by doubling the created frame, while Samsung and Sony uses the first created frame and the following real frame to create a second created frame. This takes more processing, which in turn costs more money, which is why the Sony/Samsung 240hz TVS are so much more expensive than the LG 240hz.
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have you noticed 120 hz tv's look weird?
