Originally Posted by augustya
So r u suggesting at 265 PPI, with a 2048 x 1356 it can still be called a Retina Display ?
Not just suggesting it, I'm stating it outright. Retina Display can be any definition Apple wishes but the most rational definition should be based on "perfect"* vision and distance one would view such a display. Consider an HDTV, they have very large pixels compared to any handheld device but you view the display so much farther back than a handheld device that they can get away with it. You don't think that a 60" 16:9 HDTV would have to have 300 PPI or more to be considered Retina Display, do you? That's a 15700x8820 display or 138,474,000 pixels being pushed compared to even a 1080p HDTV which is only 1920x1080 or 2,073,600 pixels.
* 20/20 vision is considered perfect vision but it's not neither the best vision nor most common for adults. There is technically no such thing as perfect
edit: LOL I see TS beat me to it when I was doing my math.
edit2: More math... They can make this up as they see fit, but they do have to be able to justify it or risk irrevocably weakening said marketing term. I’d say about 16-22” seems about right for a tablet. Based on that criteria the PPI would need to be 156 to 215. Very doable since even 7” tablets are exceeding that lower measure.
(Where 3438 is the scaling factor derived from a 1 arc minute visual acuity for 20/20 vision.)
- 3438 * (1/12") = 287 ppi
- 3438 * (1/13") = 264 ppi
- 3438 * (1/14") = 246 ppi
- 3438 * (1/15") = 229 ppi
- 3438 * (1/16") = 215 ppi
- 3438 * (1/18") = 191 ppi
- 3438 * (1/20") = 172 ppi
- 3438 * (1/22") = 156 ppi
Now that we have that squared away we can easily use a PPI calculator to see what difference displays would be. Here’s a simple site I like to use: http://thirdculture.com/joel/shumi/c...e/ppicalc.html
- XGA: 1024 x 768 = 786,432 pixels = 132 ppi*
- SXGA: 1280 x 960 = 1,228,800 pixels = 165 ppi*
- SXGA+: 1400 × 1050 = 1,470,000 pixels = 180 ppi*
- UXGA: 1600 × 1200 = 1,920,000 pixels = 206 ppi*
- QXGA: 2048 x 1536 = 3,145,728 pixels = 264 ppi*
That’s a lot more pixels to render even going the minimum Retina Disaply classification outlined above based on about 22” away from eyes. Still, I think the SXGA+ is actually doable on the newer Imagination Tech GPUs. It’s almost 2x as many pixels of the current iPad, but Apple isn’t close to using the most powerful GPU they offer. Whether that is viable for power efficiency reasons, if they can even source these displays when the current IPS displays seem to be holding the iPad production up already, or if they need to wait a year (or more) for other reasons is obviously unknown.
PS: For comparison, the iPhone 4S’s GPU is only working for a 614,400 pixels.
* Assuming a 9.7” display.