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post #21 of 30
I've been talking to some smart industry guys over at avsforum. They are big into 3D and are waiting for the new HDMI chips so they can come out with true 120 Hz 1080P projectors.
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post #22 of 30
Quote:
Originally Posted by stargate125645 View Post

Quote:
Originally Posted by MenacingTuba View Post

None of the true 120hz monitors can do 120hz via HDMI 1.4a (displayport & dual-link DVI with PC's only) and TV's only accept 60hz and under. 3D TV's do 1920x1080@24hz(3D blu-ray) or 1280x720@60hz (3D console games). Consoles accept a maximum of 60hz.
People seem to make a big stink about having a "true" 120Hz display. You're suggesting that those displays only work at 120Hz if they use HDMI 1.4b, D-DVI, or DisplayPort, correct?

Those screens do, in fact, refresh upwards to 600 frames per second if they are rated for it. The display can do it, the input does not. By my understanding, and I'm unsure on this part, but VGA is suppose to support above 60 hz at 1080p, and I wouldn't be surprised that if you hooked up your 120 hz display via VGA that you'll be able to input more then 60 hz signals. Can anyone confirm that?

If the signal input is only sending a 60 hz signal, then the maximum output refresh rate is 60 fps. The display is a different story. After that, you need to consider the individual pixel transition rates as well. So even if your monitor is 60 hz, colour shifts may not be operating at those rates either. 5ms response times can have, for example, a blue LED shifting to a green LED in 17ms, which then implies that the display output is not exactly 60 fps.

But anyways, yes, you need a cable to support enough bandwidth to have the input to the display operating at above 60 hz if you want to output more then 60 viewable frames per second.
post #23 of 30
Quote:
Originally Posted by Domino View Post

Those screens do, in fact, refresh upwards to 600 frames per second if they are rated for it. The display can do it, the input does not. By my understanding, and I'm unsure on this part, but VGA is suppose to support above 60 hz at 1080p, and I wouldn't be surprised that if you hooked up your 120 hz display via VGA that you'll be able to input more then 60 hz signals. Can anyone confirm that?
If the signal input is only sending a 60 hz signal, then the maximum output refresh rate is 60 fps. The display is a different story. After that, you need to consider the individual pixel transition rates as well. So even if your monitor is 60 hz, colour shifts may not be operating at those rates either. 5ms response times can have, for example, a blue LED shifting to a green LED in 17ms, which then implies that the display output is not exactly 60 fps.
But anyways, yes, you need a cable to support enough bandwidth to have the input to the display operating at above 60 hz if you want to output more then 60 viewable frames per second.

The VGA signal has to go through some sort of digital to analog converter, and most companies seem to cheap out pretty hardcore on them. I doubt you'd get much going that direction.
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post #24 of 30
Yes, a large part of the problem is the DAC's, the pixel clock chips etc that they skimp on that does all of the limiting. A displays maximum capability is usually the speed of its slowest component.
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post #25 of 30
Quote:
Originally Posted by Domino View Post

Quote:
Originally Posted by stargate125645 View Post

Quote:
Originally Posted by MenacingTuba View Post

None of the true 120hz monitors can do 120hz via HDMI 1.4a (displayport & dual-link DVI with PC's only) and TV's only accept 60hz and under. 3D TV's do 1920x1080@24hz(3D blu-ray) or 1280x720@60hz (3D console games). Consoles accept a maximum of 60hz.
People seem to make a big stink about having a "true" 120Hz display. You're suggesting that those displays only work at 120Hz if they use HDMI 1.4b, D-DVI, or DisplayPort, correct?

Those screens do, in fact, refresh upwards to 600 frames per second if they are rated for it. The display can do it, the input does not. By my understanding, and I'm unsure on this part, but VGA is suppose to support above 60 hz at 1080p, and I wouldn't be surprised that if you hooked up your 120 hz display via VGA that you'll be able to input more then 60 hz signals. Can anyone confirm that?

If the signal input is only sending a 60 hz signal, then the maximum output refresh rate is 60 fps. The display is a different story. After that, you need to consider the individual pixel transition rates as well. So even if your monitor is 60 hz, colour shifts may not be operating at those rates either. 5ms response times can have, for example, a blue LED shifting to a green LED in 17ms, which then implies that the display output is not exactly 60 fps.

But anyways, yes, you need a cable to support enough bandwidth to have the input to the display operating at above 60 hz if you want to output more then 60 viewable frames per second.
I do not believe they will refresh that fast entirely from a signal. I think most of those capabilities come from internal interpolation.
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post #26 of 30
1080ix60 or 1080p x 24 .that is hdmi standard but it doesnt care if your tv use the 24 and repeat it 3 time or more .oh by the way if you go 3840x2160x120x3d .now that is in the official standard for ultrahd(cant call it quad since quad is based on 720 (2560x1440)
Edited by drbaltazar - 11/4/12 at 5:23pm
post #27 of 30
Quote:
Originally Posted by CallsignVega View Post

I've been talking to some smart industry guys over at avsforum. They are big into 3D and are waiting for the new HDMI chips so they can come out with true 120 Hz 1080P projectors.
Did they mention when they expect the new stuff to hit the market? Probably it'd be the next iteration of displays/projectors that comes out later next year. I'm asking because my projector died the other day and I need something new as my living room/cinema is pretty much defunct now. I most likely definitely won't survive several months without it but I'd try to get by with a cheaper unit and then upgrade later when true 120Hz hits the market.
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post #28 of 30
It's my understanding that HDMI can do 120Hz at ~720 (maybe 768?) or less, but cables are based on single-link DVI and so they do not have the bandwidth to push it at higher resolutions.

I'm interested in this topic myself if anyone has more information.
post #29 of 30
HDMI can - but most monitors can't.

For example, the Benq xl2420t has HDMI, but it cannot make use of it for 3D (120hz) operation. However, the Benq xl2420tx does have an HDMI connection capable of 120hz operation. Silly, eh? Be very careful vetting your 120hz HDMI monitor - make sure that reviews say that it is capable of 120hz over HDMI.
post #30 of 30
Some new success reports from HDTV Refresh Rate Overclocking HOWTO: True 120Hz from PC to TV
Quote:
Successful: Vizio e3d420vx
Resolution: 1920×1080 at 120 Hz
Source: http://120hz.net/showthread.php?852-Managed-to-force-120Hz-on-a-Vizio-e3d420vx
Quote:
Success: Panasonic VT50 plasma
Resolution: 1920×1080 at 120 Hz
Caveat: More heat output
Source: http://www.avsforum.com/t/1438092/list-of-hdtvs-with-120hz-native-refresh-ability-forcing-1080p-120hz-via-dvi-or-hdmi-from-computer#post_22576928
Quote:
Confirmed: Seiki 4K HDTV
Resolution: 1920×1080 at 120 Hz
The brand new SEIKI 50″ HDTV with 4K resolution supports 1080p @ 120Hz natively (Multitool confirmed).
seiki4k_720p@133Hz-300x224.jpg
Quote:
Originally Posted by deadman5k 
Successful: Vizio M420SL not a 3d TV
Resolution: 1920×1080 at 120 Hz

Using a Asus 3D tv driver I was able to force a 120hz output with windows 7 and my Vizio M420SL system info screen displays 120hz vertical frequency as well as my Catalyst control center. This TV is not a 3D but does have a native LCD refresh rate of 120hz.

Thank you blurbusters for your very helpful information. It took all day to find the right question to ask the great google search engine but when I finally asked “force 120hz pc” I found this page and now I am in 120hz, 42 inch, goodness. Next trick is getting passive 3d working. Thanks again.
Quote:
Originally Posted by sadbuttrue 
Successful: Panasonic 50ST30 plasma
Resolution: 1280×720 @ 120hz.
Source: HardForum post (by sadbuttrue)

The OSD reports 60hz and 3D mode detected. Colours are slightly different but there is no 3D being applied. I have verified that it does show 120 unique frames.
So, when you try outputting 120hz to your TV don’t assume the OSD is giving an accurate report. It may say 60hz yet actually be showing 120hz.

HDTV Overclocking Instructions: Get 120Hz from a PC to a television

Improve your successes by:
-- Using a high quality HDMI cable (3D / 4K compatible) even if the HDTV has only HDMI 1.3 ports
-- Try all ports on TV
-- Try all ports on computer
-- Do not use any adaptors (Do not use DVI-D to HDMI adaptor)
-- If you fail, there's always 720p@120Hz which is much easier.

P.S. Excellent success rate on Vizio and Panasonic televisions made in the last two years.
Edited by mdrejhon - 6/11/13 at 11:15am
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