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3D: 240hz vs. 120hz

post #1 of 9
Thread Starter 
Just bought the Samsung UN55D6900 from Best Buy. (It's a Best Buy exclusive model even though you can read about it on Samsung's official website).

The question is simple:

Is there a difference when watching 240hz vs 120hz in 3D?

I've heard some talk about how a 120hz signal in 3D is actually divided into two signals at 60hz- one 60hz signal for each eye.

Is it worth the extra money for a 240hz if you are going to be watching 3D movies and gaming in 3D?
post #2 of 9
You have a 240hz option you can set? If so, I'd bank it is greyed out when doing 3D.
post #3 of 9
Thread Starter 
No. I don't have an option. I was asking about a 120hz vs 240hz rated television.

The TV I happened to buy is 120hz- but I dont know if I should have buyer's remorse because it's not 240hz.

Is it worth the extra money to buy a TV with 240hz for 3D movies and gaming?
post #4 of 9
You want a 240HZ set for 3D movies so that you can get a 1080p/60 video frame for each eye and also havea 1080p Black frame inserted after each video frame in order to reduce/eliminate video ghosting/crossover between video frames.
The Samsung 2011 D series 3D models reportatly have much crosstalk then the 2010 C series model so your 120HZ model be just fine for 3D movies.
I am not sure that a 240Hz TV offers any benefit for current 3D gaming programs.
post #5 of 9

Thank you for your informative comment on 3d 120 vs 240. the eye issue only refers to the pixel ration. Also if I'm in error, blue ray 3d movies are maxed at 60hz anyway.

post #6 of 9
Quote:
Originally Posted by technonono View Post

Thank you for your informative comment on 3d 120 vs 240. the eye issue only refers to the pixel ration. Also if I'm in error, blue ray 3d movies are maxed at 60hz anyway.

That is incorrect. The input to your TV from a 3D Blu-Ray disc is 24Hz per eye. In other words the total frame rate is 48Hz and that gets divided between the eyes. The addition of frame blanking can improve crosstalk between the eyes in 3D. It also produces a darker picture.

All of the 120Hz or 240Hz processing is done inside your TV. It has nothing to do with the Blu-Ray disc. Blu-Ray 2D can use 1080p/60, but again any upconversion to 120Hz or adding blank frames or 240Hz is all done inside the TV.
post #7 of 9
Quote:
Originally Posted by alk3997 View Post

That is incorrect. The input to your TV from a 3D Blu-Ray disc is 24Hz per eye. In other words the total frame rate is 48Hz and that gets divided between the eyes. The addition of frame blanking can improve crosstalk between the eyes in 3D. It also produces a darker picture.

All of the 120Hz or 240Hz processing is done inside your TV. It has nothing to do with the Blu-Ray disc. Blu-Ray 2D can use 1080p/60, but again any upconversion to 120Hz or adding blank frames or 240Hz is all done inside the TV.
so when I see ghosting in 3d when setting my htpc to output at 1080p or 720@ 24hz but the ghosting goes awy when I set it to 720p @60hz its the tv thats doing this? I'm assuming its not dropping frames correctly?
post #8 of 9
Quote:
Originally Posted by augiedoggy View Post

so when I see ghosting in 3d when setting my htpc to output at 1080p or 720@ 24hz but the ghosting goes awy when I set it to 720p @60hz its the tv thats doing this? I'm assuming its not dropping frames correctly?

Maybe. It depends upon your source material. But if it is a commercial Blu-Ray disc being used on a HTPC, then it could also be inside your HTPC. The only thing I could guarantee is that it isn't "in" the disc. The source is still 1080p/24 3D.

So, what causes the ghosting? The ghosting is simply one eye seeing remnants of the frame meant for the other eye. So, glasses not being in sync would be a reason. The 60Hz may provide more margin or as you said, it could be TV image blanking or holding intervals that have changed. Is the picture any darker at 60Hz?

That's a stange conversion to make for 3D. May I ask, why do you convert?
Edited by alk3997 - 10/25/13 at 8:47am
post #9 of 9
So for watching 1080p normal TV or a Blu-Ray is 240hz better than 120hz or are people wasting money? Can your eye's tell the difference on say a 65 inch TV?
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