2014 Vizio Thread All models - Page 198 - AVS Forum
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post #5911 of 5916 Old Yesterday, 06:51 PM
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Can someone explain to me why a 60 hz panel needs to use 3:2 pulldown for 24fps rather than just switching to a 24hz mode where it only shows 24 fps exactly as intended? I mean, maybe I'm crazy, but I have an HTPC, and it supports 23.976 and 24hz refresh options among others, and there seems to be countless software options that switch the refresh rate for just such things. Are people saying that all 60hz panels can onyl do 60hz and not any other slower rates? Or is it possible I'm not using 3:2 pulldown and am seeing things as they were meant to, without needing 120hz?

For what it's worth, my HTPC uses integrated graphics, so it can't go beyond 60hz anyway, I have the E701i-A3 from last year, and I believe it is a true 120hz panel, but the only way to do 120hz would be to buy an expensive separate gpu just to have such an option.
TVs have a native refresh rate and always display content at that rate. So if a TV is 60hz it has to do 3:2 on 24hz signal to get it to 60hz. A 120hz TV would just to 5:5 on 24hx to get to 120hz.
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post #5912 of 5916 Old Yesterday, 07:22 PM
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TVs have a native refresh rate and always display content at that rate. So if a TV is 60hz it has to do 3:2 on 24hz signal to get it to 60hz. A 120hz TV would just to 5:5 on 24hx to get to 120hz.
So just to make sure I'm understanding, the Vizio 700i-B3 is a 60hz panel, it uses 3:2 pulldown and there is no escaping this fact. It strobes the LED backlight 120 times per second, which somehow makes it 120hz effective, but overall it's just a gimmick and the tv is going to have a lot of juddering? I ask because I am replacing my 701i-A3 with one, and if it's going to look like garbage with juddering multiple times a second, I may just want to sell it and get something else.

Further research on another thread here says that it does 24 fps just fine, without 3:2 pulldown, but doesn't explain the how or details, and then another post says someone asked somewhere else and was told 24fps means the tv does 24fps now, and 3:2 pulldown was only an issue before tv's could take that sort of input and refresh at that rate. Can anyone confirm?

Also how do monitors compare to TV's in this sense, I know many monitors take multiple inputs as well, and back in the day of CRT's is actually had meaning, but are all monitors 60 or 120hz and just converting whatever input they get, or can they actually change to 24hz and display things correctly?

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post #5913 of 5916 Old Yesterday, 07:30 PM
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So the only way to get true 120hz, is to have an htpc or 3d blu ray player with 120hz capabilities, an AVR that supports 120hz passthrough, and a tv that is true 120hz not 60hz with an effective 120hz refresh rate?

In that case, why does anyone even use the 23/24hz refresh rates on HTPCs when they could just do 120hz native and call it good, having the HTPC do the work rather than the tv? Also why haven't I seen 120hz in any of the best quality guides for setting up an HTPC? Is it even something that exists for the common person?
Most TVs will not accept 120hz signals as there is no 120hz content.
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post #5914 of 5916 Old Yesterday, 07:31 PM
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So the only way to get true 120hz, is to have an htpc or 3d blu ray player with 120hz capabilities, an AVR that supports 120hz passthrough, and a tv that is true 120hz not 60hz with an effective 120hz refresh rate?



In that case, why does anyone even use the 23/24hz refresh rates on HTPCs when they could just do 120hz native and call it good, having the HTPC do the work rather than the tv? Also why haven't I seen 120hz in any of the best quality guides for setting up an HTPC? Is it even something that exists for the common person?

The display is the only one that is fixed. An HTPC can output multiple rates. The HTPC and Blu-Ray output 24Hz because that's what then source is encoded in (movies). The TV is the one that needs to be able to display it. 120hz is NOT what the source is in which is where I think your getting confused.


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post #5915 of 5916 Old Yesterday, 08:37 PM
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The display is the only one that is fixed. An HTPC can output multiple rates. The HTPC and Blu-Ray output 24Hz because that's what then source is encoded in (movies). The TV is the one that needs to be able to display it. 120hz is NOT what the source is in which is where I think your getting confused.


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So on a 120hz vizio which is actually 60hz, how does a 24fps video get to 60hz without some sort of judder doing 3:2 pulldown or something else?

Also, I found a thread from 2010 which seems to also say many tv's go to 48hz to properly display 24fps when a tv can't do 120hz native, or at least the decent tv's from 2010 did, I don't see why all modern tv's wouldn't do something similar now when the panel is only 60hz

1080/24p on a 60hz HDTV
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