digdog: 4” Retina Display is 288 PPI Current iPhone 4 is 3.5” display with 960-by-640-pixel resolution at 326 PPI, if the 4” display rumor is true, then under same 960-by-640-pixel resolution, the PPI will be 288, and the size of the display will be 2.218 inches width, 3.328 inches height. P.S. Current iPhone 4 is 2.31 inches width, you may now start your imagination. (Man! I see a super cool edge cutting display!) P.S.S. The other rumor said about iPad 2’s Retina Display is 2048x1536 resolution at 260 PPI. P.S.S.S. iPhone 3GS and earlier devices is 3.5” 320x480 resolution at 163 PPI.
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digdog:

4” Retina Display is 288 PPI

Current iPhone 4 is 3.5” display with 960-by-640-pixel resolution at 326 PPI, if the 4” display rumor is true, then under same 960-by-640-pixel resolution, the PPI will be 288, and the size of the display will be 2.218 inches width, 3.328 inches height.

P.S. Current iPhone 4 is 2.31 inches width, you may now start your imagination. (Man! I see a super cool edge cutting display!)

P.S.S. The other rumor said about iPad 2’s Retina Display is 2048x1536 resolution at 260 PPI.

P.S.S.S. iPhone 3GS and earlier devices is 3.5” 320x480 resolution at 163 PPI.

Source: digdog