Originally Posted by mrfixit58
I have a 2 month old Sept 2013 build 64" with about 300 hrs. on it. I have been watching it, and had concerns especially about motion, although I did see some stuff that looked pretty good, usually sports. Now, I am talking about directv feeds mostly. Movies on Directv by in large look like crap especially action scenes. This was not the case with my old Sony sxrd or my 46" panasonic plasma. I thought I and downloaded the latest firmware last month, but I guess it didn't take as I had decided to have a calibrator tune the set and look at it. He downloaded, I believe 1204. Anyway, sometimes the picture is fairly sharp, and lots of times it isn't. Crappy motion makes movies on Direct not worth watching to me as I am very particular about my Video. Last night I was watching the news and when it went to commercial even they were jittery. This is a plasma, should be smooth as silk and is noted to be. I started reading this thread, am only on page 7. Thought it was time to chime in. What's going on here? Help would be greatly appreciated! By the way, everything is turned off,Motion judder etc.
People talk about plasma motion quality all the time and this has led to the misconception that plasma has fluid motion in 30/24fps content, which isn't true. The only time you'll actually see fluid motion with no jittering double image effect is when you have 60 fps content to match the 60hz refresh rate. That means 60fps sports broadcasts, some console games, and the majority of PC games assuming a fast enough system.
Regular TV content is 30fps which means that each frame must be displayed twice to avoid seeing huge amounts of visible flicker (it would feel like a fast strobe light due to the low frequency). This gives you a double image effect that makes motion seem jittery because your eyes see this (horizontal is time, vertical is position):
Which doesn't create a straight line and messes up your motion tracking. The object was moving, but then it stopped, then it started moving again. Optimally you want this, which your eyes will track as continuous motion:
But if you have 30fps content those dark gaps will be too long and you'll see the screen flashing, which is going to be way worse than any motion issues. So in that situation the panel shows each frame twice as in the first diagram. If you have 60fps content then each frame just gets shown on a single refresh so there's no visible flicker and your eyes track a clean motion path.
For comparison LCD and current OLED do "sample and hold" which means the screen never goes dark, it just holds the current frame until the next one comes up:
This creates the same issue as the double exposure, except now there are no gaps so you don't even see distinct double images, you just get a smear (sample and hold motion blur). Of course with sample and hold even when you have 60hz (or higher) content to display the smear never goes away, it just gets shorter. So LCD is incapable of clear motion at any frame rate (unless you pulse the backlight or introduce black frames to simulate the impulse drive of plasma/CRT). In the extreme case of a 120hz + refresh rate with 120fps+ content the blur becomes relatively insignificant, but this is really only something that applies to PC gaming.
So the TL;DR version of all this is that it's impossible to have smooth motion at 30 or 24fps without introducing an intolerable amount of flicker or interpolating frames (which results in lots of "shredding" when the algorithm fails). And this is why the only solution to motion issues would be to go to HFR 60fps content and have the content creators introduce the amount of motion blur they want at the production level. As the Hobbit movies showed this is a difficult task (I felt that by the 3rd they'd significantly improved on the soap opera look of the 1st, but I'm sure many are still unhappy with it).