IPhone4 vs. 3GS screen effect: Remove the particle sense (fig)

A close-up picture of the iphone 4 shows a close-up picture of the iphone 3GS on the morning of the June 8 Beijing time, according to foreign media reports, Apple CEO Steve Jobs said at the Monday Apple Global Developers Conference that the new iphone　　4 will use a display technique called retina (retina) screen. But what is the retina screen technology? What's the benefit of this technology for the iphone? Apple says the retina screen is a highly pixel-dense LCD screen that compresses the 960x640 resolution into a 3.5-inch display.　　In other words, the pixel density of the screen reaches 326 pixels per inch (ppi). The number of pixels in the retina screen has increased 4 times times compared with previous generations of iphones, but the screen size has not changed, which doubles the pixel density. The 99-dollar iphone 3GS has a pixel density of 163ppi, with a resolution of 480x320.　　By contrast, you can clearly see the advantages of the new screen. When the pixel density exceeds 300ppi, the human eye cannot distinguish between individual pixels, Jobs said.　　So the iphone 4 pixel density of 326ppi has a very good display function, no more granular feeling. Apple's Retina display technology also promises to improve contrast. Apple said the IPhone 4 would be 4 times times more contrast than previous products.　　In addition to using more pixel-intensive screens and LED backlight technology, the IPhone 4 will also use IPS technology to increase the visual angle and enhance the color display effect. Apple is not the first company to introduce a super high-resolution screen into a smartphone. Google's own brand of mobile phone nexus One of the OLED screen with the previous use of 800x480 resolution. (PEI)