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The Dell 2707WFP is a go

Our sources at Samsung LCD whispered to us a few weeks ago that Dell will feature a 27" LCD this fall with a 1920x1200 resolution. 

We got confirmation of this rumor earlier today from former Tom's Hardware editor Vincent Alzieu that Dell has also confirmed the upcoming display to him.  In a recent conversation, Alzieu claimed "the 2707WFP will be here in October."  Of course, he was talking about France in particular, and a US launch may be even closer.   You can find the rest of his thoughts about the upcoming display on his website, BeHardware.com

Samsung LCD is currently the only display manufacturer with plans for a 27" WUXGA LCD panel, the LTM270M1.  The S-PVA panel is a true 8-bit design with a claimed response time of 8ms gray to gray.  For all intents and purposes, the display is identical to the Dell 2407WFP now available via the Dell USA website -- Samsung makes the 24" WUXGA panel found in that display as well. However, the 27" panel has a less dense 0.303mm pixel pitch which is not the most attractive pixel width we've seen.    


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By Odeen on 3/28/2006 5:37:22 PM , Rating: 2
quote:
Samsung makes the 24" WUXGA panel found in that display as well. However, the 27" panel has a less dense 0.303mm pixel pitch which is not the most attractive pixel width we've seen.


In the days of CRT panels, "dot pitch" was a measure of the quality of the display. A smaller dot pitch meant that an image of a given resolution, and on a given screen size would be SHARPER. Higher dot pitch meant that the image would be blurrier once the CRT ran out of "dots" to resolve image detail.

LCD's don't work that way. LCD's have one given resolution, and one given size - the number of dots doesn't dictate when the image gets blurry, it's perfectly sharp at max rez (and, as we all know, blurry when rez is too low, and nonexistent when rez is too high.) So, pixel pitch is a factor of size and resolution, not an indicator of image quality.

Let's do some math. For the 27" screen, 1920x1200:

Number of pixels along diagonal = square root of (1920^2 + 1200^2) = square root of 5126400 = 2264.16 pixels

Diagonal size = 27inch * 25.4mm/inch = 685.8mm

Pixel pitch = diagonal size in mm / pixels along diagonal (1)
685.8mm / 2264.16 dots = 0.303 DPI

You can't have any "wider" (or thinner) DPI without either changing the resolution, or changing the size of the display.


(1) Some CRT monitors quote a "horizontal" dot pitch. That number is lower, because you measure the side of the square pixel, not its diagonal, which is about 1.4 times (sqrt(2)) larger. Trinitron / Diamondtron CRT's have continuous "stripes" of phosphorus painted on, instead of traditional Invar shadow mask "triads". Those monitors have a stripe pitch, directly comparable to a horizontal dot pitch, because their vertical resolution is technically infinite.




By Visual on 3/30/2006 7:38:48 AM , Rating: 2
you're not making sense claiming that DPI calculated your way will be different than horizontal.

imagine a square screen, say 100x100 - how much pixels does it have along the diagonal? still 100, not 140 or any sqrts. so if you really calculate it properly along the diagonal, you'll get a lower DPI than horisontal. but your math is still correct in some way - if you assume (wrong) 140 pixels on the diagonal and calc the DPI, you infact will get the same result as calulating it horizontally.
my point is, the "horizontal" dpi is the same like what you calculated, and won't be lower. a "proper" diagonal calculation will actually result in a lower dpi but is quite useless.


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