 The iPad 's touchscreen display is a 1 @,@ 024 by 768 pixel , 7 @.@ 75 × 5 @.@ 82 in ( 197 × 148 mm ) liquid crystal display ( diagonal 9 @.@ 7 in ( 246 @.@ 4 mm ) ) , with fingerprint- and scratch @-@ resistant glass . As a result of the device 's screen dimensions and resolution , the screen has a pixel density of 132 ppi . The display responds to other sensors : an ambient light sensor to adjust screen brightness and a 3 @-@ axis accelerometer to sense the iPad 's orientation and switch between portrait and landscape modes . Unlike the iPhone and iPod Touch 's built @-@ in applications , which work in three orientations ( portrait , landscape @-@ left and landscape @-@ right ) , the iPad 's built @-@ in applications support screen rotation in all four orientations , including upside @-@ down . Consequently , the device has no intrinsic " native " orientation ; only the relative position of the home button changes . 
