Pixel Density of iPod and iPhone

With this weeks announcement of the iPhone 4 I thought I would update a previous post about screen sizes and resolutions of the various generations of iPod's and iPhones.  The iPhone 4 does have a pretty impressive pixel density, almost 3 times that of an iPad.  If you want to see some other device pixel densities check out this article at Tested.

iPhone
iPhone - 3.5" - 480-by-320-pixel - 163 pixels per inch
3G - 3.5" - 480-by-320-pixel - 163 pixels per inch
3GS - 3.5" - 480-by-320-pixel - 163 pixels per inch
4 – 3.5” – 960-by-640 pixel – 326 pixels per inch
It appears the screen on iPhone (and Touch) didn’t change from introduction until the 4.

iPad
iPad – 9.7” – 1024x768 pixel – 132 pixels per inch

Nano
1st Gen - 1.5" - 176 x 132 pixel - .168-mm dot pitch
2nd Gen - 1.5" - 176 x 132 pixel - .168-mm dot pitch
3rd Gen - 2" - 320-by-240 pixel - 204 pixels per inch
4th Gen - 2" - 320-by-240 pixel - 204 pixels per inch
5th Gen – 2.2” – 240-by-376 pixel – 204 pixels per inch
The 5th Gen has a slightly larger screen but maintains the same pixel density.  I don’t see a lot of changes coming to this model anytime soon.

Touch
1st Gen - 3.5" - 480-by-320 pixel - 163 pixels per inch
2nd Gen - 3.5" - 480-by-320 pixel - 163 pixels per inch
3rd Gen- 3.5" - 480-by-320 pixel - 163 pixels per inch
One has to wonder if there will be a 3rd Gen Touch based on the form of iPhone 4?

The classic has gone through many revisions, however I am only going to talk about those that had color screens.
Color - 2" - 220-by-176 pixel - 0.18-mm dot pitch
Photo - 2" - 220-by-176 pixel - 0.18-mm dot pitch
5th Gen - 2.5" - 320 x 240 pixel - .156-mm dot pitch
5th Gen V2 - 2.5" - 320 x 240 pixel - .156-mm dot pitch
Classic - 2.5" - 320-by-240 pixel - 163 pixels per inch
Classic 2nd Gen - 2.5" - 320-by-240 pixel - 163 pixels per inch
Classic 3rd Gen - 2.5" - 320-by-240 pixel - 163 pixels per inch
One has to wonder how much longer the Classic will exist for, you can get 64 GB Touch and the Classic is only 160 GB.  Who needs 160 GB of music in their pocket?

One interesting note is the pixel density is the same on Touch and Classic just different size screens but the Nano has much denser pixels.  Now the iPhone 4 ups the ante on pixel density by almost double.