Display
A significant highlight of the iPhone 4 was its 3.5-inch IPS LCD screen, which boasted a resolution of 640 x 960 pixels with a 3:2 aspect ratio, producing a dense pixel-per-inch (ppi) of around 330. This pixel density result was branded by Apple as a "Retina Display," offering users crisp text and vibrant images. The use of Corning Gorilla Glass and an oleophobic coating protected against scratches and minimized fingerprint smudging. The display provided exceptional contrast ratios, notably 1242:1, ensuring clear visibility across various lighting conditions, though the sunlight legibility wasn't optimal at 2.016:1.