At 04:26 PM 9/17/2006, you wrote:
LCDs operate in digital. If you send it an analog signal, it must convert it
back to digital for presentation. Most LCDs that accept a digital input seem
to do a pretty poor job converting an analog input back to digital.
Additionally, Cleartype works best with an all-digital signal path.
Well, every source I have found so far doesn't place too much importance on it.
For example from CNET Monitor buying guide
http://reviews.cnet.com/4520-7610_7-5084364-3.html?tag=tnav
<Digital and analog connections: LCDs are digital devices and thus have to
convert analog (VGA) signals before they can be displayed. A graphics card
with a digital video interface (DVI) can send the signal straight to the
display in digital format--no conversion required. Most LCDs come with an
analog input (featuring a D-shaped connector that has 15 pins arranged in
three rows, sometimes labelled D-Sub), some come with both, and only a very
few come with just a digital input. Nevertheless, at this point, most
monitors do such a good job of signal conversion that digital connections
are not as important as they used to be.>
In your case, the 2407WFP runs 1920x1200. That will require a very high
pixel clock...I don't think you're ever going to see good results with a 15'
run over analog at that resolution.
If it doesn't work then there is no point in buying the monitor for me. I
can tell you that there is no loss running a long SVGA cable to CRT, and
analog video card. I have been doing this for years, and have done my own
extensive side by side comparisons.
I am currently running a ATI AIW800X with a digital analog convertor
through 25 foot cable to my Mitsubishi 2040u. That monitor is sitting next
to an identical monitor with a six foot cable on it plugged into a
AIW9600PRO, I stare at these all the time and I have noticed no difference
in quality what so ever.
PCMAG once investigated the use of longer analog monitor cables and what
they found out was that up to 50 feet it wasn't the length that was
important, it was the number of connections that mattered. If you daisy
chained monitor extension cables, then you suffered significant breakdown
of the signal, but an uninterrupted cable had no loss, that they could
detect, under 50 feet.
Even DVI may be problematic at that resolution. You're probably either going
to need a pretty high quality DVI cable, or perhaps even a DVI repeater.
Greg
I wish I could find a definitive answer on this because I don't want to buy
the monitor if it isn't going to work the way I need it to work.
thanks
