There's a new breed of iPhone on the way, code-named “iPhone Math”, according to the rumour mill. There is a good chance that this could be the iPhone 6, a partner to the iPhone 5S, and may even launch at exactly the same time.
This article is based on rumour. We'll update it as more information becomes available.
iPhone 6 = iPhone Math?
The raison d'etre of the iPhone Math, which we'll refer to from now on as the iPhone 6, is that it has a larger screen. 4.8 inches across rather than the four inches of the iPhone 5 and iPhone 5S, it competes rather more directly with the Samsung Galaxy S4, the iPhone series's key rival for 2013.
This screen size creates a number of crucial problems, though. The iPhone 6 needs to maintain compatibility with existing apps, and can't significantly drop pixel density, especially if it's to be a “higher-end” alternative to the iPhone 5S.
If Apple was to simply blow-up the screen of the iPhone 5 to 4.8 inches, pixel density would be 306dpi. That's a solid figure, but less than the 326 of the aged iPhone 4, and more crucially well below the 440dpi of the Samsung Galaxy S4. Even if there's little discernible difference, we doubt whether Apple would make do with such a “low” pixel density.
The other issue is that Apple can't simply make its resolution a bit higher. In the past, Apple has doubled the horizontal and vertical resolutions of its devices when upping resolution. This let the iPhone 4 and the iPad 3 simple double-up on pixels when running apps designed for previous-generation models. Such a move assured near-flawless backwards compatibility.
To pull off the same trick in the iPhone 6, Apple would need to ramp-up resolution to either 2,272 x 1,280 (if it uses the iPhone 5 screen aspect ratio) or 1,920 x 1,280 (if it is to use the iPhone 5S screen aspect. This will result in pixel density of a Samsung Galaxy S4-beating 543dpi, or 480dpi. These may sound impossibly high, but the latter in particular is not far off the 1,920 x 1,080 pixels of the latest 5-inch 1080p phones.
Also, the iPhone 6 is likely to use a new screen technology, Sharp's IGZO. This is an LCD-based panel tech designed for high screen resolutions, and high power efficiency. It's cheaper to produce than current low-temperature polysilicon iPhone 5 screens. IGZO is also flexible.
However, this “iPhone Math” rumour is new, and doesn't deserve all that much weight. The iPhone 6 will come, but will it arrive this year, and will it be a 4.8-inch device? That's the part we can't be so sure of.
We'll be back with more iPhone 6 and iPhone Math news as it appears.
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