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New Eizo Fdf2405w 240hz VA-panel released! - Page 4

post #31 of 37
Since this screen is the only of it's type, it's most likely the high end-low volume electronics that are the huge cost. Not really the panel itself. Then again, has a VA panel ever come close to a 4ms GTG?
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post #32 of 37
Quote:
Originally Posted by CallsignVega View Post

Since this screen is the only of it's type, it's most likely the high end-low volume electronics that are the huge cost. Not really the panel itself. Then again, has a VA panel ever come close to a 4ms GTG?

BenQ commonly quotes 4ms grey to grey for their VA monitors. Some of the grey to grey transitions do actually occur this quickly, actually faster using typical one-way measurements. But then there are other transitions that are much, much slower. It really isn't a very useful measure to look at on any monitor, but for VA panels the range of pixel transition times is massive so even less so. The Eizo should be able to pull down more of its transitions to faster speeds than seen on other monitors because it can get away with using really aggressive overdrive in its strobing mode, using the strobing itself to mask the most problematic overshoot. That sort of thing without a strobing backlight is completely off the cards (think a more severe version of S2440L overshoot).
post #33 of 37
Ya, I know manufacturer pixel response claims can be all over the place. So when are you getting one of these PCM? biggrin.gif
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post #34 of 37
I don't think I've buttered up Eizo's PR people enough yet. I'm working on it. tongue.gif
post #35 of 37
Quote:
Originally Posted by PCM2 View Post

BenQ commonly quotes 4ms grey to grey for their VA monitors. Some of the grey to grey transitions do actually occur this quickly, actually faster using typical one-way measurements. But then there are other transitions that are much, much slower. It really isn't a very useful measure to look at on any monitor, but for VA panels the range of pixel transition times is massive so even less so. The Eizo should be able to pull down more of its transitions to faster speeds than seen on other monitors because it can get away with using really aggressive overdrive in its strobing mode, using the strobing itself to mask the most problematic overshoot. That sort of thing without a strobing backlight is completely off the cards (think a more severe version of S2440L overshoot).
I am very curious about:

1. Strobe length measurement. Motion blur on strobe-backlight monitors is directly proportional to the strobe flash length.
If the 240Hz rating is "by the book", that means a 4.1ms strobe flash length (240/1000ths of a second), creating exactly 4.1ms of motion blur (e.g. about 4 pixels of motion blurring for every 1000 pixels/second of motion -- which translates to 2 pixels of blurring during 500 pixels/sec, of 8 pixels of blurring during 2000 pixels/sec). If done that way, is worse than LightBoost, which uses strobe lengths of about 1.4ms to 2.4ms. But, the good news is:

2. The page 15 of the Eizo FDF2405W manual says "turns on the backlight only for the stable duration of the second image". That suggests only at the very end of the second-pass refresh. Strobe length would be less than one refresh cycle long, and suggestive of a shorter strobe. This would be good news, perhaps bringing it down to LightBoost clarity (or better).

3. Brightness adjustment could influence strobe length. Dimmer settings may create clearer motion, much like LightBoost=10% has clearer motion than LightBoost=100%. The difference becomes easily noticeable in TestUFO's Panning Map Test at www.testufo.com/photo#photo=toronto-map.png&pps=1440
If there's a wide dimming range in blur reduction mode, that could theoretically mean 4ms during 350cd/m2 maximum brightness, adjusting all the way down to sub-millisecond strobes such as 0.5ms (wow!) at a minimum 40cd/m2 which is still brighter than LightBoost=10% on many LightBoost monitors! Let's hope Eizo thought of this, and made the brightness during strobe mode, adjust the strobe length to sub-millisecond levels. That's short-persistence CRT league!
Edited by mdrejhon - 9/29/13 at 5:15pm
post #36 of 37
Ya, this monitor could turn out to be quite impressive. It may be so impressive that it actually garners the $5K+ price tag, but then of course no one will have the display besides the CIA. tongue.gif
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post #37 of 37
Quote:
Originally Posted by mdrejhon View Post


2. The page 15 of the Eizo FDF2405W manual says "turns on the backlight only for the stable duration of the second image". That suggests only at the very end of the second-pass refresh. Strobe length would be less than one refresh cycle long, and suggestive of a shorter strobe. This would be good news, perhaps bringing it down to LightBoost clarity (or better).

That's what I thought when reading the manual. The way I understand it, the backlight would be off when the original frame is being drawn and also any 'unstable' (artifact ridden?) bits of the duplicated frame. So this could give a strobe length closer to LightBoost and hide much of the unwanted 'noise' of the aggressive overdrive they'd have to be using.
Quote:
Originally Posted by CallsignVega View Post

Ya, this monitor could turn out to be quite impressive. It may be so impressive that it actually garners the $5K+ price tag, but then of course no one will have the display besides the CIA. tongue.gif

Haha. Yeah. biggrin.gif I think it's a potentially very interesting technology demonstration of what can be done with a VA panel, would be great to see further (cheaper) developments.
Edited by PCM2 - 9/30/13 at 12:12am
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