3.5英寸的视网膜显示器上有614400像素，平均每英寸屏幕上有326像素，容量为现在市面版本的4倍，乔伊斯在对比展示3代和4代产品文字显示的不同。
The retinal display fits 614,400 pixels onto a 3.5-inch screen . At 326 pixels per inch , the screen contains four times as many pixels as the current iPhone . Jobs shows a side-by-side comparison of 3GS an iPhone 4 text .
像素每英寸