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Old 03-05-10, 10:38 AM   #1
Kain
 
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Default 60Hz vs. 120Hz vs. 240Hz TVs

What all this talk about Hz? Higher the Hz, better the TV? Is this talk on Hz only relevant to LCD TVs or also Plasmas?
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Old 03-05-10, 11:52 AM   #2
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

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Originally Posted by Kain View Post
What all this talk about Hz? Higher the Hz, better the TV? Is this talk on Hz only relevant to LCD TVs or also Plasmas?
This is only relevant to LCDs....Plasma's already have a very high Hz rate, usually in the 600s (@ least my Panny 50 does).

As for LCDs, the higher the Hz refresh rate, the better it will be when you watch fast action stuff like sports, racing, etc. Go for at least 120 depending on your price point.

Good luck!
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Old 03-05-10, 12:13 PM   #3
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

Also, just an FYI... but you have posted 3 questions in Gen chat not relevant to this forum.

For television, try the AV thread.. For graphics, try the sub forum relevant to your particular card.

You'll probably get more responses.
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Old 03-05-10, 01:50 PM   #4
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

Also 120Hz and 240Hz TVs can be used for 3D (if they really are true 120 and 240Hz).

Normally, 600Hz TVs etc. can display 600 frames, but these frames are generated from the 60Hz input signal - using interpolation, they generate additional frames to make the image smoother in panning shots etc. True 120Hz TVs can have 120 different pictures per second as input. This is required for 3D - 60Hz per eye.

You cannot use your 600Hz TV for 3D unless it supports 120Hz input (most do not as far as I know).
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Old 03-05-10, 11:07 PM   #5
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

Almost every 120\240Hz TV uses a 60Hz input as well.

There are very very few displays that accept a 120Hz input for 3D vision.
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Old 03-06-10, 07:52 AM   #6
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

Exactly. You have to be careful when purchasing a TV and you want it to be 3D ready
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Old 03-06-10, 12:02 PM   #7
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

Thanks for the replies.

So, you need a minimum of 120Hz for 3D? If so, then what is the point of 240Hz and higher? Is it to make the panning shots even more smoother?
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Old 03-06-10, 01:04 PM   #8
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

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Originally Posted by Kain View Post
Thanks for the replies.

So, you need a minimum of 120Hz for 3D? If so, then what is the point of 240Hz and higher? Is it to make the panning shots even more smoother?
As someone already mentioned it's not a real refresh rate, but a 60Hz signal interpolated to 240Hz. What you want is a TV that is 3D ready, like Panasonic's upcoming plasma series.

Any Panasonic owners that have noticed the blacks going grey on your sets? Apparently Panasonic has confirmed this issue, but are doing nothing to fix it(link).
They said that the issue's gonna be fixed in the next series though.
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Old 03-12-10, 07:28 PM   #9
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

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Originally Posted by Toss3 View Post
As someone already mentioned it's not a real refresh rate, but a 60Hz signal interpolated to 240Hz. What you want is a TV that is 3D ready, like Panasonic's upcoming plasma series.

Any Panasonic owners that have noticed the blacks going grey on your sets? Apparently Panasonic has confirmed this issue, but are doing nothing to fix it(link).
They said that the issue's gonna be fixed in the next series though.
I haven't on mine.
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Old 03-12-10, 11:30 PM   #10
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

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Originally Posted by Toss3 View Post
As someone already mentioned it's not a real refresh rate, but a 60Hz signal interpolated to 240Hz. What you want is a TV that is 3D ready, like Panasonic's upcoming plasma series.
Just note that not all new Panasonic plasmas will be supporting 3D, only the high-end VT series.

I do know that the new Philips 8000 and 9000 series LCDs support 3D, and the 8000 series is relatively inexpensive as part of their mainstream series. I'm considering waiting for it myself.

Quote:
Any Panasonic owners that have noticed the blacks going grey on your sets? Apparently Panasonic has confirmed this issue, but are doing nothing to fix it(link).
They said that the issue's gonna be fixed in the next series though.
It was enough to make me wait for the G20 series, but I really think it was overblown. It was a co-worker who pointed this issue out to me, thinking it was limited to 2009 plasmas when I was considering buying one. He himself has a 2008 plasma and never noticed it on his own, and was surprised when he found some time later that the issue also affected his. He never noticed it despite being a technology buff.

On a side note, those 600hz plasmas don't actually output 600hz images. I believe the screen update rate is in the region of 96-100hz for the higher end series whereas the 600hz number comes from an internal clockrate. That is, the actual image processing chip goes through 600 frames per second, but they don't all end up on screen.
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Old 03-13-10, 12:07 AM   #11
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

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Originally Posted by Kain View Post
Thanks for the replies.

So, you need a minimum of 120Hz for 3D? If so, then what is the point of 240Hz and higher? Is it to make the panning shots even more smoother?
It's actually a matter of mathematics. American TV is recorded at 30 frames per second whereas films are recorded at 24 frames per second. Since regular TVs display images at 60 frames per second (or 60hz) there is no issue with TV footage because 60hz is divisible with 30fps. That is, you simply show each frame twice.

However, it becomes problematic when viewing films because you can't divide those 60 frames per second on the TV between those 24 frames per second that make up the film footage. If you show each frame twice then it results in 48 frames per second (12 frames short of the TVs framerate) and if you show it three times then it exceeds the TVs framerate by going up to 72. On a 60hz TV, the only way around this is to have an inconsistent framerate to bring the total to 60 frames per second.

That was the reason why 120hz TVs first started showing up. Because 120 is divisible by both 30fps and 24fps then you can have a proper framerate for both TV and films on a 120hz TV.

But when you introduce 3d into the mix, your 120hz TV goes back to an effective 60hz for each eye. Hence, the only way to get the proper framerate back on a 3d display is by upping the TV to 240hz.

Just note that not all 120hz or 240hz TVs support 3d; it's simply cheaper for manufacturers to have fewer product lines. While the increased refresh rate can improve smoothness, it's still artificial and largely depends on taste.
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Old 03-13-10, 12:33 AM   #12
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Default Re: 60Hz vs. 120Hz vs. 240Hz TVs

So, am I correct in saying that 240Hz TVs that only accept a 60Hz signal (meaning, no 3D support) have no real advantage over a 120Hz TV?
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