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post #141 of 239
Quote:
Originally Posted by steadystate View Post

I joined this forum just to chime in on this thread. I bought a U2412M and had the same experience that others here have had regarding flicker. The display is far too bright unless the brightness is reduced (to around 30 in my case), which produces unbearable flickering due to the PWM. I tried several other LED backlit monitors. All did the same thing. I couldn't look at the Dell for more than a minute with the brightness reduced without getting severe eyestrain, headache, vertigo, etc.

The solution I found was to buy some 1/8" #2094 "neutral density" plexiglass (cut to size), which I placed on top of the screen. This material reduces light transmission by about 50%, but reduces all visible frequencies by the same amount. The result is no color shift, just a reduction in brightness.

Using this material, I can run the U2412M at 100% brightness setting, with the actual luminosity at about 120 nits. I use a Color Munki to calibrate. I have also tried gel sheets by Lee Filters (#209) and Roscolux (#97 or 398), which also work, but are not rigid enough. You can use a calibrator to reduce the brightness (while leaving the monitor's brightness setting at 100), but this kills your contrast ratio. Using the neutral density filters keeps my contrast ratio high and the brightness down, with zero flicker.

I just want to add that IMO, LED backlit monitors with PWM have set monitor ergonomics back 20 years or more.

Many thanks for the info! Rep+

Where can you usually get the #2094 "neutral density" plexiglass ? I'll see if I can buy some for my LG 27" monitor.

As to your last sentence, I fully agree! If the PWM is flickering at a low frequency, it's unusable as a computer monitor. CCFL backlit monitors have the relative advantage of, if being dimmed with PWM, that the phosphor retains some light and so the curve between the on and off cycles is smoother. And even so, for some people they may only be suitable as a TV that one views from a distance.
 
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post #142 of 239
So are there any other good 24inch monitors worth checking out?
post #143 of 239
how many of you have directly ordered from the dell website? i live in canada and apparently on resellerratings they have a horrible review mostly about laptops and computers, didn't see too much about monitors though. how was your experience no rmas?
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post #144 of 239
i get all my dell stuff direct from them through work. Never had more than 1 monitor bad out of the box. And the one that was bad, was in a batch of 30.. so pretty good numbers for me anyway. All 3 of my U2412m's came in perfect condition and are working fine so far. thumb.gif
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post #145 of 239
perfect condition until you read a thread on this site. this site can point out **** you'd never notice by yourself . then those things start bothering you to the point of getting rid of your stuff.
    
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post #146 of 239
thanks for the feedback. well that's only if you let it bother you but for perfectionists it would be nearly impossible
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post #147 of 239
So is flicker really that noticeable?
post #148 of 239
Quote:
So is flicker really that noticeable?

All 3 of my U2412M came in perfect condition with absolutely no flicker, my backlight is at 35%. But my old Dell 1804fpv has a very noticeable flicker when the brightness is turned down. So yes if you get one that does flicker it is very noticeable, but you cold always rma it if you get on that does.
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post #149 of 239
wish this monitor would go on sale.
    
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post #150 of 239
I have had U2412M as my main monitor for the passed year, I have been very happy with it. I have brightness 30 contrast 70, and I can look at it for many hours straight with no eye strain. Its good because you can use it in a totally dark room, with brightness and contrast almost at 0, and you can still use it comfortably. Its also a 16:10 aspect so its only 2.5cm shorter than a 16:9 27inch, and has more pixles. Games play fine on it. The stand is perfect, and the back of it looks good.The only issue is the antiglare coating, but if you use it an office youll need it. Dell got it to my house 2days after I clicked buy button on their web site. Shore, you can get the Korean ips, but it does not have the Dell warranty. The only alternative is the Samsung 27" 1400p ips, which are double the price. Also, it generate almost no heat.
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