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發表於 2010-8-30 18:23:51
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本文章最後由 len1978 於 2010-8-30 18:25 編輯
轉貼一篇舊文(2008年)參考：
Samsung: What Samsung 1080p @ 120Hz LCDs support 5:5 pulldown
Allow me to clarify
by Samsung_HD_Tech
I didn't mean to let your post go stale. Thanks for following up.
120Hz, by the very design of 120Hz, is that a signal coming in at 24Hz would mathmatically be displayed 5 times.
24Hz x5 = 120Hz
The 120Hz panel will always show 120Hz; it is incapable of showing a native 60Hz, and would therefore double it.
So it would be pretty fair to deduct that a signal at 60Hz would be displayed twice, and a signal at 30Hz would be shown 4 times, and a signal at 24Hz would be shown 5 times
The benefit is that each frame is shown evenly, which is helpful in reducing judder.
The benefit of 120Hz is that it can display 24Hz, 30Hz and 60Hz evenly without an uneven pulldown requirement necessary. This way, the picture wouldn't be marred by interpolation.
Even with processing such as AutoMotion Plus, the signal will still be shown 5 times at 120Hz, just with picture enhancement added for smoother motion. (Of course, this is defeatable for the "true" theater videophile... but that's a whole other topic!)
3:2 pulldown will make 5 frames out of four. So it will show odd frames for 50 milliseconds, and even frames for 33. At 120Hz, each of the 5 frames will be on the screen for 42 milliseconds. To really achieve this, however, you need a source content that is shown in 24fps, and that translates into a Blu-Ray player 24fps capable with a 24fps version of a movie.
We probably wouldn't officially announce this in, say, a press release, since it's somewhat of an industry understood thing. But questions like this are absolutely appropriate in forums.
Regards,
--HDTech |
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