3007WFP-HC 50Hz refresh?

w.pasman,

We had the 3007WFP-HC designed to operate at only 60hz. Anything else is outside those parameters. You could render the monitor unusable. What video card are you using to play these videos? The reason I ask is that all scaling/adjustments are done by the video card.

Message Edited by DELL-ChrisM on 09-27-2007 02:57 PM

Chris, "We had the 3007WFP-HC designed to operate at only 60hz." But all video here is 50Hz (or 25p which also does not fit on 60Hz). So how do I properly play back video on this otherwise great display? "You could render the monitor unusable." What do you mean exactly with this?

w.pasman,

You could damage it or shorten the life of it. We have no way of knowing since you would be operating it out of specifications.

the dell monitor does 60Hz... which is *smoother* than 50Hz...

the higher the Hz the smoother the picture... (hence the very latest LCD TVs do 120Hz, which provides an ultra realistic picture, at an ultra price)

anyhow...

with that said... i've never read anything about what you're describing (60Hz being shaky and 50Hz not...) it doesn't make sense...

download the latest drivers for your video card, and google "klite mega codec pack site:betanews.com" and install it...

forget about what you've read or been told... please try the above first.

"forget about what you've read or been told... please try the above first." Please, I know what I am doing and there is nothing wrong with the drivers. I can push any video signal to the monitor. My question is about what would be the right signal to get this monitor in 50Hz, if there is any.

"the higher the Hz the smoother the picture... (hence the very latest LCD TVs do 120Hz, which provides an ultra realistic picture, at an ultra price)" No, please think about this. The video is 50Hz. If you display it 60Hz, some frames will be doubled, others not. This causes shaky display. This is exactly the same problem as the 2:3:2 pulldown etc, only now the monitor is doing the pulldown. I think it makes sense, but whether it makes sense or not does not really matter. The footage looks shaky and it looks smooth when I play it on a 50 Hz monitor. I can compare the two objectively, using a Dell 2407 that can handle both 50 and 60 Hz refresh rates.

CRTs (big tube monitors/old school) let you choose a variety of Hz settings... however, with LCDs there's 1 or 2 different Hz settings (e.g. 60hz 59hz) but basically deals with "native" settings... with CRTs there really are no native settings, as they're made to display whatever resolution optimally... but with LCDs you have 1 optimal setting (i.e native resolution)...
anyhow...

like the dell support said, if you try to force this, you can cause permanent damage to the LCD monitor...

plus, as noted, i have never read about the issue you're having... i'm assuming if you're experiencing flickering/shaky playback, it has to do with either
A) a broken LCD,
B) not powerfull enough video card
C) not powerful enough CPU
D) oudated codec
E) mix of any or all of the above

also, this 30" monitor is rated as THE best performing 30" monitor on the market currently available... it has received glowing reviews in ALL categories (yes, even playing movies and HD movies)

btw... may i ask what exactly are you playing (DVD? x264? etc) when you get this flickering? also what program are you using (if using your PC) to play the content? and your system specs.

Message Edited by kakuzen on 09-28-2007 12:50 PM

"like the dell support said, if you try to force this, you can cause permanent damage to the LCD monitor..."

Again, what can go wrong? There are just a few digital chips processing digital signals in the way. Putting in a data signal at another data rate should not make much difference. If you put on 1920x1200 to the monitor, the datarate already will be much different, because much less data has to be pumped to the monitor.
And IF the monitor would switch to 50Hz refresh for the panel, would that damage anything? What, why? I think the analog parts can handle 50Hz just as well, or maybe even better, than 60Hz?

I'm playing HD1080i50 using VLC, de-BOBbed.

As said, if I play this on the Dell 30", either with the screen at the native or at 1920x1200, it is a bit shaky. Especially during moderately fast pans. It looks as if the motion stops 1 frame every 8 frames or so.
If I play it on the 2407, it is exactly the same shaky effect if I have the screen at 1920x1200@60Hz. If I put the screen at 1920x1200@50Hz it is perfectly smooth.

To me this makes completely sense, assuming that the 2407 supports 50Hz natively.

I'm using a macbook pro 15" with 256Mb video memory. I'm pretty sure that the software is not limiting here, as I can set the 30" screen at 1920x1200@60Hz and it looks exactly the same shaky. In this case I believe the situation for my machine is identical to when it is connected to the 2407, yet what you see is much different.

But what don't you buy my simple explanation that 60Hz display does not fit 50 Hz video? This is just the plain old frame rate conversion problem, isn't it?

Message Edited by w.pasman on 09-28-2007 03:33 PM

OK, if you don't believe me maybe you believe other reports on this on the web.

http://www.burnyourbonus.info/hdtv-faq/faq2.html

"The incompatibility with the US standards of 60 Hz will of course be a problem. It will mean a reduction of quality in conversion of US programs to Europe because they will effectively have to repeat every 5th frame. No doubt this will show as a judder to the discerning eye."


http://gizmodo.com/gadgets/home-entertainment/120hz-hdtvs-the-secret-to-making-movies-look-as-smooth-as-butter-231872.php

http://www.pcpro.co.uk/phpbb/viewtopic.php?t=214064 (last post)

http://forum.blu-ray.com/showthread.php?page=3&t=5155

("Well even if your TV could accept the 1080p/24, your TV would still have to add the 3:2 pulldown itself (the TV is still 60Hz). So you're not seeing the 1080p/24 regardless. The only exception to that rule is if you can change the refresh on the TV. Pioneer's plasmas can be set to refresh at 72 Hz. These will take the 1080p/24, and do a simple 3:3 pull down (repeating each frame 3 times).”)

http://www.dtvforum.info/index.php?showtopic=24425

"The value you are talking about is the refresh rate of the screen. To avoid judder/microstutter you should buy something that will do 50Hz as that is what your STB and DVD player put out with PAL material."

Message Edited by w.pasman on 09-28-2007 04:03 PM