The most concrete suggestion so far has been a 1704 x 960 resolution that could see the current "2x" Retina display move to an even sharper "3x" display.
Till this point, every aspect of the upcoming iPhone 6 has been leaked and as far as both the versions are concerned, there is debated going on about the resolutions featured on these two variants and different analysts have presented different theories. The suggestion which has come to our attention says that Apple will use a 1704 x 960 resolution which will show an upgrade to the 2x retina which will jump up to an even sharper 3x display.
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The Russian luxury modified iPhone vendor Feld & Volk has leaked yet another photo which gives us an idea of the display of the 4.7 inch version of the iPhone 6 under a microscope and the firm has told MacRumors that this panel most likely contains a 1704 x 960 resolution. The picture on the other hand doesn’t really comply to this claim since it shows roughly 13 pixels per mm in the horizontal and vertical directions whereas as a 1704 x 960 panel should be somewhat close to 16 pixels per mm. if we compare this with the current iPhone 5s, then its display is roughly 10.5 pixels per mm.
According to a report by 9to5Mac, they have discovered another resolution of 1472 x 828 within recent Xcode 6 beta releases and the reports says; “This particular file outlines for the system where icons, by default, will be placed on an iPhone’s Home screen. This particular file, which was added in Xcode 6 beta 5 earlier this month and still exists in yesterday’s Xcode 6 beta 6, is optimized for an iPhone with a resolution of 414 (width) x 736 (height). The iPhone SDK parses hardware resolutions via “point values,” so the actual “Retina” resolution is in fact double (or potentially triple) whatever numbers the SDK presents.”