Retina Display PPI comparison

[Let's Sekuhara!]

So Retina Display is any resolution of 300ppi or finer, right?
What are the Pixel-Per-Inch specs of the new Retina 15-Inch MacBook Pros, The New iPad (Gen3), and the iPhone 4/4S?
It seems the PPI of the devices is not readily available and I'm sure someone here knows.
Just want to get a feel for the difference between all three.
Thanx.

 

[btbrossard]

Here's some details for you:

New iPad (3rd Gen)
9.7" Display, 2048x1535 resolution, 264 ppi

iPhone 4/4s
3.54" Display, 640x960 resolution, 326 ppi

MacBook Pro 15-inch Retina Display
15.4" Display, 2880x1800 resolution, 220 ppi

 

[NutsNGum]

There's a gigantic list of display PPIs on Wikipedia if you Google "display PPIs" it's the second link on the list. How hard is it?!?

 

[Jb07]

So Retina Display is any resolution of 300ppi or finer, right?

No. It depends on the distance viewing the screen. Since you hold a tablet and laptop farther from your face than a phone, the PPI can be less than 300 and still be "Retina." Retina is nothing but a marketing term for High-resolution screens.

 

[Moonjumper]

Retina is nothing but a marketing term for High-resolution screens.

It is a marketing term, but it does have a meaningful definition. It refers to having a high enough resolution that someone with good eyesight cannot resolve individual pixels at the normal viewing distance for that device.

 

[Randomoneh]

It is a marketing term, but it does have a meaningful definition. It refers to having a high enough resolution that someone with good eyesight cannot resolve individual pixels at the normal viewing distance for that device.

Good? Good?! Below average at best.

And even if someone couldn't discern a pattern like this one, that doesn't mean that person can't perceive higher quality that that!

How so?

A quote from Japanese NHK study:

"The higher the angular resolution, the greater the sense of realness, and the sense greatly saturates above about 60 cpd [120 pixels per degree]; above 155 cpd [310 pixels per degree] - images are indistinguishable from the real object." (page 4.)

Test subjects had 20/10 vision. Theoretically, maximum angular resolution they can perceive is 120 pixels per degree (60 cpd, 0.5 arcminutes per pixel) - yet they manage to perceive 310 pixels per degree.