Packeteers
Premium
join:2005-06-18
Forest Hills, NY
4 edits |  Stable Black on LCD Screens
I just bought a pair of Asus VW266H screens.
»www.zipzoomfly.com/jsp/ProductDe···10010392
I'm satisfied with my purchase, except I do
notice some Black on Black snow when the
screen is mostly Black in games and movies,
and some all black background forums like;
»Anime/Sci Fi
I run IsMyLcdOK v1.02 and the Black* test
shows the same snow. When my PC boots
the black looks fine until the LCD syncs at
the full 1920x1200 **60mhz I run them on XP
with my old NVidia GeForce 7300 GT -256mb
»www.nvidia.com/page/geforce_7300.html
I notice the same snow connected with
SVGA or DVI, and there is no magnetic
resonating interference I can isolate.
(using original ferrite core collar cables)
Is this just the way such cheap screens
work, and I have to live with it, or is there
some way to improve Black rendering on
such screens? I really don't want to go
through the headache of returning them.
I can live with bad black since I mostly
use the LCDs for business applications.
* other color tests have no snow*** at all.
** must use 60mhz or text looks distorted
and I'm not using fluorescent room lighting.
*** is "snow" the correct terminology when
describing that rippling interference pattern? |
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IllIlIlllIll
EliteData
Premium
join:2003-07-06
Lindenhurst, NY | can you take a high res picture of this with the camera extremely still when snapping the picture ?
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☺ |
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Packeteers
Premium
join:2005-06-18
Forest Hills, NY
3 edits | thanks for showing an interest in my problem 
I'm unable to still photograph it properly, but I was able to catch a second of what it looks like on this 2 second video. you'll notice the test screen goes all solid flicker free blue to all black, and for that first second before the CCD in my camera adjusts to the lower light, you will see a glimpse of the hazy black on black snowy flicker I get on my LCD screen for as long as the majority of my screen is black. This is the best way I can illustrate my problem using the crappy old 3mp point & shoot camera I keep handy 
»rapidshare.com/files/290137367/m···avi.html
here's another attempt to illustrate the black snow without confusing it with my 1 LUX CCD attempts to compensate for the low light.
»rapidshare.com/files/290151198/m···avi.html
when you boot Windows XP there is a brief moment (second 8-9) before the screen auto syncs from VGA to full (1920x1200) resolution - that's the only time my screen is black without interference - the backlite is on, but the black on the screen does not snow - you'll notice the black changes during that second before the all blue screen comes up to a login prompt. this tells me it's not ELF/VLF or power problems, rather something with this new 25.5" LCD. my old 22" Acer (1680x1050) LCD did not snow like this at all this using the same cable, video card, and computer.
even when I run the new Asus 25.5" at 1680x1050, I still get the same Black on Black snow problem. |
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Packeteers
Premium
join:2005-06-18
Forest Hills, NY
| reply to Packeteers
good news!
to make a very long troubleshooting story short,
the latest NVidia update from today fixed my
black on black issues. it also changed the way
my screens are set up - but the end results
are still the same, so how I got there is fine.
my black on black is back - baby 
moral of the story - if you utilize the full extent
of your hardware's ability - make sure you use
manufacturer's drivers - not windows updates. |
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drjim
Premium,MVM
join:2000-06-13
Torrance, CA
clubs: | ALWAYS good advice! I've lost count of the times a "Windows Update" driver update borked one of my systems. I pass on them now.
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One man's Magic is another man's Engineering. |
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