The touchscreen is a 25 cm (9.7 in) liquid crystal display (1024 × 768 pixels, 132 ppi, XGA) with fingerprint–resistant and scratch-resistant glass. Like the iPhone, the iPad is designed to be controlled by bare fingers, not gloves and styli that prevent electrical conductivity (although there are gloves and styli designed for this use).
The display responds to two other sensors: an ambient light sensor to adjust screen brightness and a 3-axis accelerometer to sense iPad orientation and switch between portrait and landscape modes. Unlike the iPhone and iPod touch, which work in three orientations, the iPad supports screen rotation in all four orientations, meaning that the device has no intrinsic "up" or "down"; only the position of the home button changes. Most iPad applications support both portrait and landscape mode.
The iPad has a switch to lock out this screen rotation function (reportedly to prevent unintended rotation when the user is lying down). There are a total of four physical switches, including a home button below the display that returns the user to the main menu, and three plastic physical switches on the sides: wake/sleep and volume up/down, along with the screen rotation lock.
The display responds to two other sensors: an ambient light sensor to adjust screen brightness and a 3-axis accelerometer to sense iPad orientation and switch between portrait and landscape modes. Unlike the iPhone and iPod touch, which work in three orientations, the iPad supports screen rotation in all four orientations, meaning that the device has no intrinsic "up" or "down"; only the position of the home button changes. Most iPad applications support both portrait and landscape mode.
The iPad has a switch to lock out this screen rotation function (reportedly to prevent unintended rotation when the user is lying down). There are a total of four physical switches, including a home button below the display that returns the user to the main menu, and three plastic physical switches on the sides: wake/sleep and volume up/down, along with the screen rotation lock.
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