QUOTE(anfieldude @ Feb 27 2009, 10:03 AM)
I wish I was a master of PQ, but I'm not and have been wrong before. I am still learning.
Anyway, movies/films are normally shot in 24frames per second (24Hz). This is primarily done to save space. Most BD are mastered in 24 fps (technically it is 23.97 fps - this I am not sure why, a real expert needs to explain this). Thus when played back 24 frames are played back in 1 sec. The problem is the eyes is our eyes does not have this refresh rate stuff. Our eyes can normally detect this when a slow panning shot on camera is showing on a screen. We see 24Hz judder. To counter this, most displays repeat each frame 1/2/3/4/5 (24/48/72/96/120 Hz) per second to reduce the effect of judder and thus showing a more natural picture. Again repeating each frame too many times start introducing a "video" like picture and a lot of videophiles dislike this. I have seen refresh rates of up till 72Hz and do not feel that it is videolike. A lot of pjs have this function as well. JVC, Epson and all. I am not sure of the refresh rates of the Optoma. Hope it helps. Again, my explanation might be slightly off. I believe ar188 is pretty well versed with this stuff as well. Correct me if I am wrong.
The thing is 24Hz judder is as the director meant it. So it is not all that bad. The 24Hz conversion to non multiples of 24/48/72/96/120 like 60Hz, 100Hz is where the judder becomes unbearable. I believe that is what is happening in the case of the AMP being turned on for the Samsungs and other displays that have options for processing of 24Hz material wrongly.
Edit: I believe the term speed up I used in the earlier reply was wrong. It is actually 24Hz being displayed at 48/72/96 Hz , meaning the frames are repeated. Speed up is only normally done for 24fps > 25Hz (each frame is sped up).
To add: what's the main difference between refresh rate (like the 100Hz/200Hz tv?), 24 fps (does dvd has this feature?) and motion flow (??) It's all a bit confuse to me...

And secondly, do all 1080p tvs have 24fps feature?

Thanks...
ps - on a personal note, I love watching bds (at shop's demo) with the so-called "videolike" look aka 24 fps... it takes me to another level of viewing movies (unlike at cinema) and one important reason why I'm upgrading to bd, apart from its great PQ & AQ of cos... Thinking of buying 1080p tv this year but to be absolute sure to get the right model/type dat can handle these feature.