For the iPhone 4, the display technology used to achieve retina display was developed by LG Display. The name 'retina display' is based on the assertion that a display of approximately 300 ppi at a 10-inch (254 mm) distance from one's eye is the maximum amount of detail that the human retina can process. With the iPhone expected to be used at a distance of about 10 inches from the eyes, a higher resolution would allegedly have no effect on the image's apparent quality as the maximum potential of the human eye has already been met.
According to Raymond Soneira, president of DisplayMate Technologies, the resolution of the actual human retina is higher than claimed by Apple, working out to 477 pixels per inch at 12 inches (305 mm) from the eyes.Phil Plait of Bad Astronomy wrote a response that agreed in a way with both Apple and Soneira, saying "if you have [better than 20/20] eyesight, then at one foot away the iPhone 4’s pixels are resolved. The picture will look pixellated. If you have average eyesight, the picture will look just fine."