During today ’s introduction of the iPhone 4 , Steve Jobs detailed that the approaching machine will make use of whatApple calls theRetina display .
But what exactly is a Retina display and how will it , along with other screen technologies , do good the newfangled slender , HD - quick iPhone ? To put it simply , Apple ’s figurativeRetina displayis an LCD that boasts a super high pixel density by compact a 960 - by-640 - pixel resolution into 3.5 inch – a pixel denseness of 326 pixels per column inch ( ppi ) .
The Retina display has four times the number of pixels as previous iPhones ; its covert size is unaltered , resulting in double the pixel density . When equate to the now $ 99 iPhone 3GS , which has a 163ppi screen with a 480 - by-320 resolution , it ’s easy to opine just how this new blind will shine .
A close-up photo of an icon on the iPhone 4’s screen.
A close - up pic of an icon on the iPhone 4 ’s screen .
While mouth about the new display , Steve Jobs went on to detail that after a certain point the human optic fail to differentiate individual pixel . According to the Apple CEO this “ magic number , ” when visible pixelation is no more , is around 300ppi . Therefore , with the iPhone 4 ’s screenland fare in at more than 300 pel per inch ( 326ppi ) the show will supposedly always looks smooth and crisp , with no jaggies in sight .
By comparison , the same image on an iPhone 3GS .
Apple ’s retina display also promises an improved contrast proportion . The company claims that the upcoming iPhone 4 will have a direct contrast proportion four times higher than that of previous models . Beyond the utilisation of more thick pixels the screen , which is a backlit LED , will also adoptIn - Plane Switching ( IPS ) technologyto meliorate take in Angle and heighten color presentation .
Apple is n’t the first to put a tiptop - gamy - resolution screen in a smartphone . Google ’s Nexus One , for illustration , features an OLED screen with a result of 800 - by-480 pixels , but its subpixel placement has some issues .
