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LightBoost, G-SYNC, Turbo240: 120Hz Strobe Backlight LCDs / No Motion Blur! - Page 135

post #1341 of 2929
Quote:
Originally Posted by mdrejhon View Post


However, it's a brightness-versus-motion clarity tradeoff.

LCD monitors can go way over 300cd/m2 when you should be running about 120cd/m2 - isn't that more than enough headroom for Lightboost?
post #1342 of 2929
Quote:
Originally Posted by PCM2 View Post

In which country?
America
post #1343 of 2929
The XL2411T was never available in the US unless imported, was it?
post #1344 of 2929
Thread Starter 
Quote:
Originally Posted by Moragg View Post

LCD monitors can go way over 300cd/m2 when you should be running about 120cd/m2 - isn't that more than enough headroom for Lightboost?
LightBoost 10% is equivalent to a 5:1 ratio of black frame insertion (dark 85% of the time, strobing 15% of the time). That means it's flashing only 1.4ms out of each 8.3ms (1/120sec refresh). So you're losing 85% of brightness during LightBoost=10%, so it is often barely only 50cd/m2 on many LightBoost monitors.

Some monitors with LightBoost uses boost pulses -- it does so on the XL2411T and VG248QE. The boost pulses can be modified to be brighter, so the backlight it emits at least >500cd/m2 during the strobe in order to achieve average brightness of ~90cd/m2 during LightBoost=10%
Successful electronics modification of a LightBoost monitor for brighter LightBoost=10%

Interesting factoid: Many high-brightness CRT's flicker at 5,000cd/m2 at the electron gun beam spot, to achieve average brightnesses far less than 100cd/m2.

Someday I'd like to see strobe backlights of 0.5ms or 1.0ms, and that will require even brigther backlights in order to achieve a sufficiently bright image, since we'd now be starting to approach almost 20:1 black frame insertion ratios (95%:5% black frame versus visible frame).

Mathematically, strobe length is directly proportional to amount of motion blur.
50%:50% strobes = 50% less motion blur relative to regular 120Hz (and 50% darker)
75%:25% strobes = 75% less motion blur relative to regular 120Hz (and 75% darker)
85%:15% strobes = 85% less motion blur relative to regular 120Hz (and 85% darker)
95%:5% strobes = 95% less motion blur relative to regular 120Hz (and 95% darker)
Edited by mdrejhon - 7/25/13 at 2:40pm
post #1345 of 2929
Quote:
Originally Posted by PCM2 View Post

The XL2411T was never available in the US unless imported, was it?
Ah, okay I went to Amazon.co.uk and yes your suspicions were correct... could not find it in the US but I did find it there.
post #1346 of 2929
For those that were curious about the XL2420TE in non-Lightboost mode, I can confirm it's lowest brightness setting with zero-PWM is in fact lower than the two other monitors I have here. I have decided to keep one of the XL2420TE's for it's zero-PWM feature and use as a side monitor to my 3x1 Portrait XL2720T surround setup. If you want a non-Lightboost 120-144 Hz monitor that has a wide brightness adjustment and zero-PWM flicker, the Xl2420TE is the one to get (well, the only). I personally love Lightboost strobing and zero-PWM on m y eyes versus regular PWM strobing.

I would normally have stuck with my Dell U2413 but I found a nasty bug in which if you have a surround setup at 120 Hz, and a 60 Hz monitor on the side it doesn't work properly and the "feel" of the 120 Hz setup drops down to the 60 Hz. So, if you have a 120 Hz surround setup and want to run that 4th screen, you must match it with a 120 Hz screen.
Edited by CallsignVega - 7/25/13 at 7:20pm
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post #1347 of 2929
Thread Starter 
Quote:
Originally Posted by CallsignVega View Post

For those that were curious about the XL2420TE in non-Lightboost mode, I can confirm it's lowest brightness setting with zero-PWM is in fact lower than the two other monitors I have here.
That's good news -- could be the redeeming quality of XL2420TE, because I've had a few complaints that many 120Hz monitors are way too bright, even at Brightness=0%.
And even if you don't get eye strain from PWM, the ability to lower brightness, without seeing ugly PWM motion artifacts, is a good benefit for people who prefer the non-LightBoost image.
i.e. It's like a more expensive VG248QE, to contain these specific nice perks.
post #1348 of 2929
Quote:
Originally Posted by Moragg View Post

LCD monitors can go way over 300cd/m2 when you should be running about 120cd/m2 - isn't that more than enough headroom for Lightboost?

120cd/m2 is only really suggested for a relatively dim room. In a moderately to well lit room (especially with natural light coming in) 160cd/m2+ is often preferred. But they're just recommendations when doing colour manipulation. For gaming it's obviously good to stick with a brightness that reflects the room conditions as well, but there is more room for personal preference.
Edited by PCM2 - 7/25/13 at 11:53pm
post #1349 of 2929
Quote:
Originally Posted by PCM2 View Post

120cd/m2 is only really suggested for a relatively dim room. In a moderately to well lit room (especially with natural light coming in) 160cd/m2+ is often preferred. But they're just recommendations when doing colour manipulation. For gaming it's obviously good to stick with a brightness that reflects the room conditions as well, but there is more room for personal preference.

Interesting. I can see the logic behind that, but I do like a slightly less bright monitor as it's easier on the eyes. Though for colour manipulation you're right that keeping it the same as the ambient light level would be important.

+rep for the info.
post #1350 of 2929
Quote:
Originally Posted by CallsignVega View Post

I can confirm it's lowest brightness setting with zero-PWM i
Ok but what is its value of cd/cm2 ?
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