The iPhone 5 configurations have a 4" (diagonal) widescreen multi-touch IPS LED-backlit 1136x640 native resolution (326 ppi) "Retina" display, which has "integrated touch technology" so the pixels themselves act as a touch-sensitive digitizer. The iPhone 4 and iPhone 4S models likewise have a multi-touch IPS LED-backlit "Retina" display, and it likewise is 326 ppi, but the display is only 3.5" 960x640, so it's shorter but the same width. The iPhone 4 and iPhone 4S have a separate touch sensitive digitizer, which is one reason they are thicker.