Screen and input
The touchscreen on the first five generations is a 9 cm (3.5 in) liquid crystal display and glass is available with scratch-resistant glass, while the one on the iPhone 5 is 4 inches.
The capacity touchscreen is designed for a bare finger, or multiple fingers for multi-touch screen sensing.
The screens on the first three generations have an amazing resolution of 320 × 480 (HVGA) at 163 ppi, while those on the iPhone 4 and iPhone 4S have a resolution of 640 × 960 at 326 ppi.
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