Judder free LED television? - AVS Forum
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post #1 of 11 Old 12-04-2011, 09:25 AM - Thread Starter
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Looking for a tv (LED only) that doesn't have judder. We've had a couple that have had judder and ended up returning them. We're looking for about a 60" unit. I would prefer to buy it at Costco, but would be fine with a best buy or similar. I would also like to keep it under $2000 if possible.

Any suggestions?

Thanks!
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post #2 of 11 Old 12-04-2011, 01:54 PM
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Look for a set that has 120Hz or 240Hz screen refresh. These will be inherently capable of synchronizing with both 24fps film source (Blu-Ray and HD-DVD) and 30Hz video (1080i) or 60Hz video (720p).

That's all you need for the TV spec. Then make sure that you have a video disk player capable of outputting 24Hz video signals. Most BluRay players are so capable today but you MUST configure this as the player will default to outputting 60Hz video complete with motion judder.

Likewise if you use a HTPC or Game Console, set it up for the lowest frame setting (60Hz/30Hz/24Hz) it will produce. As long as the display refresh is some integer multiple of the source video frame rate no judder is seen.

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post #3 of 11 Old 12-04-2011, 02:17 PM
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Though 24 fps content has judder built in. Though getting a 120/240Hz tv that does 24 fps multiples will get rid of pull-judder, but still can judder.
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post #4 of 11 Old 12-04-2011, 02:24 PM
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Keep in mind that LED sets are in reality LCD sets with different backlighting. 120Hz refresh rate set is still a 60Hz set x2 (60fps x2 = 120fps), each frame is shown twice to mimic 120fps. The only real advantage of a 240Hz set is for 3D but, because of the electronics involved for 3D, you should get a slightly better 2D pic. I don't think there is a set that is 100% free of judder 100% of the time but that depends in large part on your source. FWIW, I have a 120Hz LCD (CCFL) that has never exhibited judder with my BD player playing Blu-rays. Even OTA tv is pretty much judder free (but not 100%).
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post #5 of 11 Old 12-05-2011, 06:51 PM
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I only have a 60hz CCFL LCD and I don't get judder with any Blu Ray played at 24p and with most DVD's. I see judder a lot on cable and sometimes with streaming Netflix. Source is definitely a factor.

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post #6 of 11 Old 12-05-2011, 07:00 PM
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^^^ agree about source
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post #7 of 11 Old 12-05-2011, 11:14 PM
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Quote:
Originally Posted by NuSoardGraphite View Post

I only have a 60hz CCFL LCD and I don't get judder with any Blu Ray played at 24p

That's strange because a 60Hz LCD TV will play back 24p content with added 3:2 pull-down judder (since 60 isn't an even multiple of 24)

Also, The Hobbit is being shot at 48 fps and Avatar 2 is also being shot at a higher rate, precisely because 24 fps judders/strobes.
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post #8 of 11 Old 12-06-2011, 01:13 AM
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There is low fps judder when displaying motion

There is also the classic 2:3 telecine judder

And there is also 2:3 cadence stutter when 24p frames are repeated to fit 60Hz

Sometimes not so easy to know what we're seeing
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post #9 of 11 Old 12-06-2011, 10:38 AM
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Quote:
Originally Posted by Joe Bloggs View Post

That's strange because a 60Hz LCD TV will play back 24p content with added 3:2 pull-down judder (since 60 isn't an even multiple of 24)

Also, The Hobbit is being shot at 48 fps and Avatar 2 is also being shot at a higher rate, precisely because 24 fps judders/strobes.

I agree. It is strange. What that tells me is that the 2:3 pulldown in my tv is well implemented and smooth. However when the 2:3 pulldown is implemented by another device (such as my cable box) then sent to my tv, if the pulldown is poorly done, it will be more visible.

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post #10 of 11 Old 12-09-2011, 08:49 PM
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Quote:
Originally Posted by NuSoardGraphite View Post

I agree. It is strange. What that tells me is that the 2:3 pulldown in my tv is well implemented and smooth. However when the 2:3 pulldown is implemented by another device (such as my cable box) then sent to my tv, if the pulldown is poorly done, it will be more visible.

Sorry for my ignorance, but how can pulldown be "poorly done?" Aren't you either duplicating frames 2:3 or you're not? What could a device do to poorly implement pulldown?
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post #11 of 11 Old 12-10-2011, 10:55 AM
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I have found that on my HTPC, setting the Screen Resolution to 59hz will greatly eliminate the all judder when watching my Blu-Ray MKV's streamed through my network!
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