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various lcd pixel densities listed 2405fpw 1901fp 2005fpw

U

unsped

Platinum Member
one of the things i like about my 19" is that its only 1280x1024, where 20" monitors jump to 1600x1200. since im in the market for a new monitor i am concerned about pixel densities.

i was a little suprised and happy to find out the 24" is about on par with my 19" whereas the 20" would be tougher to view. feel free to post others.

*EDIT* just found out the dimensions i was given are incorrect, see below, 2405 is much closer to the 2005fpw

2405fpw
20.4 @ 1920 93.83
12.75 @ 1200 94.11

1901fp (samsung 191t)
14.75 @ 1280 86.78
11.75 @ 1024 87.14

2005fpw
17.25 @ 1650 95.65
10.75 @ 1050 97.67
 
Another reason I imagine those of us with the 2405 are as happy with the monitor as we are. 🙂
 
😕 what are the units? can you explain those numbers? is pixel density any more useful than pixel pitch for determining this? aren't they mathematically related? lol nice post count (1337).
 
Those are some oblong pixels in the 2405:

2450fpw
20.25 @ 1900 93.83
14.8 @ 1200 81.08

The other two monitors have much closer values in both directions.
 
Uh pretty much all LCDs have perfectly square pixels. The stats are:

15" 1024x768 0.297mm 85.5dpi
17" 1280x1024 0.264mm 96.2dpi
19" 1280x1024 0.294mm 86.4dpi
20.1" 1680x1050 0.258mm 98.4dpi
20.1" 1600x1200 0.255mm 99.6dpi
21.3" 1600x1200 0.270mm 94.1dpi
22.2" 1920x1200 0.249mm 102dpi
23.0" 1920x1200 0.258mm 98.4dpi
23.1" 1600x1200 0.293mm 86.7dpi
24.1" 1920x1200 0.270mm 94.1dpi

(format is diagonal inches, max/native resolution, dot pitch in mm, dot pitch in dpi)

Dot pitch is the size of each pixel in both the horizontal and vertical directions.
 
Almost. Dot pitch is the DIAGONAL size of the pixel. Pixels are, for our intents and purposes square. That means a monitor will have the same height/width proportions as the proportion of the pixels (i.e. 1024x768 and 1600x1200 screens a 4:3, 1280x1024 is 5:4, 1920x1200 and 1680x1050 are 8:5, or, as a means of comparison to 16:9 HDTV, 16:10). Widescreen monitors are still to "tall" for true letterbox-less HDTV.

Size of a pixel in the horizontal direction is called "stripe" pitch, as it measures the width of individual stripes running down the monitor. Trinitron tubes, where there are no RGB "triads" and no vertical pitch, since the phosphors are painted in stripes had a true stripe pitch which could be extrapolated to a fake dot pitch. Invar shadow mask tubes often quoted "horizontal dot pitch" which, since their pixels were two-dimensional (the triads had height and width), was a lie.

I've always thought that 24" monitors were wider versions of the 20" cousins. So, let's do the math:
20.1" = 510.54mm.
sqrt (1600^2 + 1200^2) = 2000.
510.54 / 2000 = .255mm dot pitch (dot is .255mm diagonally, which means it's .255 / sqrt(2), or .1805mm high and .1805mm wide)

Now for the 24" model:
24" = 609.6 mm
sqrt (1920^2 + 1200^2) = 2264.15 (since pixels are NOT arranged in a diagonal pattern, there doesn't need to be an even number of them across)
609.6 / 2264.15 = .269mm dot pitch (holy crap, it's bigger!)

Checking the math, a 4:3 monitor that's 20.1" diagonally is 3 / sqrt (4^2 + 3^2) * 20.1, or 12.06" high, 4 / 5 * 20.1, or 16.08" wide.
8:5 monitor that's 24" diagonally is 8 / (sqrt 8^2 + 5^2) * 24, or 20.35" wide and 5 / (sqrt 8^2 + 5^2) * 24 or 12.72" high.

12.72" > 12.06. Therefore, a 24" widescreen is taller than a 20" regular. A 24" widescreen is AS TALL AS A 21.3" REGULAR. Therefore, if I upgrade my 2001FP to a 2405FPW, my fonts will grow, but I won't be able to keep the two monitors really side-by-side and have things stay the same size...

Granted, I should have noticed 21.3" and 24" monitors both having the same DPI and dot pitch, but it's late at night, and I'm quite drunk. Despite being Russian, four shots of vodka and other miscellaneous alcohol still do a number on my system. I'm going to bed. Out.
 
I should've been more specific and said I was referring to LCD monitors. I don't know that much about CRT monitors, so no idea how they're measured (I just know that the dot pitch is smaller on CRTs than on LCDs heh). For LCDs, when they refer to the dot pitch, they mean the horizontal or vertical distance between pixels; actually, the width (or height) of each pixel. So for a 19" LCD monitor, which has a dot pitch of 0.294 mm, each pixel is 0.294 mm wide and 0.294 mm high, and each sub-pixel is 0.098 mm wide and 0.294 mm high.

I've always found it funny that sizes are measured in terms of inches, but that individual pixels are measured (and designed) in terms of mm (and pixel components are designed in terms of microns). This means that the diagonal measurements (i.e. the advertised values) are rarely exact; for example, the 20.1" (1600x1200) is really 20.08" diagonally, but the 20.1" widescreen (1680x1050) is really 20.12" diagonally. Anyway, updating my table to give the vertical and horizontal measurements (in terms of inches):

15" 1024x768 0.297mm 85.5dpi 304.1mm 228.1mm 11.97" 8.98" 14.97"
17" 1280x1024 0.264mm 96.2dpi 337.9mm 270.3mm 13.30" 10.64" 17.04"
19" 1280x1024 0.294mm 86.4dpi 376.3mm 301.1mm 14.82" 11.85" 18.97"
20.1" 1680x1050 0.258mm 98.4dpi 433.4mm 270.9mm 17.06" 10.67" 20.12"
20.1" 1600x1200 0.255mm 99.6dpi 408.0mm 306.0mm 16.06" 12.05" 20.08"
21.3" 1600x1200 0.270mm 94.1dpi 432.0mm 324.0mm 17.01" 12.76" 21.26"
22.2" 1920x1200 0.249mm 102dpi 478.1mm 298.8mm 18.82" 11.76" 22.20"
23.0" 1920x1200 0.258mm 98.4dpi 495.4mm 309.6mm 19.50" 12.19" 23.00"
23.1" 1600x1200 0.294mm 86.4dpi 470.4mm 352.8mm 18.52" 13.89" 23.15"
24.1" 1920x1200 0.270mm 94.1dpi 518.4mm 324.0mm 20.41" 12.76" 24.07"

(format is diagonal inches "stated", max/native resolution, dot pitch in mm, dot pitch in dpi, screen width in mm, screen height in mm, screen width in inches, screen height in inches, actual screen diagonal in inches)

Note that I updated the specs for the 23.1", as my previous data was slightly off. Note also that all the dot pitches are (now) divisible by 3 evenly in terms of microns (0.001 mm). This is because they are designed at the sub-pixel level. You can verify that the horizontal and vertical dimensions give the correct diagonal length, close enough to what's advertised for marketing purposes.
 
The dots are square on all three of the listed pixels. Besides, the dot pitch is in their specifications, in millimeters. 0.258mm for the 2005, and 0.27mm for the 2405. For those still measuring in elbows and feet, that'll be 98.5 and 94 dots per inch, respectively. Pixels on the 19" panels are ridiculously large, around 84 dpi.
 
Pixels on 15" and 19" panels are actually STILL too small for a lot of people. In my new job as a computer consultant, I constantly espouse the advantages of running an LCD in native resolution, especially a 5:4 panel everyone seems to have now. 1024x768 looks doubly horrible (pixel stretching + aspect ratio stretching) on 1280x1024 screens, yet most people don't have eyes good enough to handle .264mm pixels on 17" panels, most don't even like it on 19".

That said, I like my .255mm pixels. My pixels are cute. My pixels are tiny. 🙂
 
Give them big icons and big fonts, and it's sorted. Don't forget to set the browsers to use the proper dpi value as well.
 
... which is exactly what we are talking about. dpi, dots per inch. Millimeters per pixel is just an internationally readable figure for this (and, as it happens, the figure Dell themselves use).
 
edited the page with some bad news. i was going off a bad measurement i got on the forums, redid it with correct params.

2405fpw - .27 dot pitch
2005fpw - .258 dot pitch
1901fp - .294 dot pitch
 
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