 The S III 's HD Super AMOLED display measures 4 @.@ 8 inches ( 120 mm ) on the diagonal . With a 720 × 1280 @-@ pixel ( 720p ) resolution , its 306 pixel per inch ( PPI , a measure of pixel density ) is a relatively high , which is accommodated by the removal one of the three <unk> — red , green and blue — in each pixel to create a <unk> matrix @-@ display ; consequently , it does not share the " Plus " suffix found on the S II 's Super AMOLED Plus display . The glass used for the display is the damage @-@ resistant <unk> Gorilla Glass 2 , except for S3 Neo variant . The device 's software includes a feature known as " Smart Stay " , which uses the device 's front camera to detect whether the user 's eyes are looking at the screen , and prevents the screen from automatically turning off while the user is still looking at it . 
