The iPad's ( first two generations) touchscreen display is a 1024 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. Steve Jobs said a 7-inch screen would be too small to express the software and that 10 inches was the minimum for a tablet screen.[62] Like the iPhone, the iPad is designed to be controlled by bare fingers; normal, non-conductive gloves and styli do not work, [63] although there are special gloves and capacitive styli designed for this use.[64][65]
The display responds to 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'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.[66]
There are four physical switches on the iPad, including a home button near the display that returns the user to the main menu, and three plastic physical switches on the sides: wake/sleep and volume up/down, plus a software-controlled switch whose function has changed with software updates. Originally the switch locked the screen to its current orientation, but the iOS 4.2 changed it to a mute switch, with rotation lock now available in an onscreen menu.[67] In the iOS 4.3 update, released with the iPad 2, a setting was added to allow the user to specify whether the side switch was used for rotation lock or mute.[8]
The first generation iPad had no camera; the iPad 2 has a front VGA camera and a rear-facing 720p camera, both capable of still images ( but these are only taken at a low quality 0.3 megapixels) and 30fps video. The rear-facing camera has a 5× digital zoom for still images only. Both shoot photo and video in a 4: 3 fullscreen aspect ratio, unlike the iPhone 4, which shoots in a 16: 9 widescreen aspect ratio. Unlike the iPhone, the iPad does not support tap to focus, but does allow a tap to set auto exposure.[68] The cameras allow FaceTime video messaging with iPhone 4, fourth generation iPod Touch, and Snow Leopard, Lion, and Mountain Lion Macs.[69]
Audio and output
The iPad has two internal speakers reproducing left and right channel audio located on the bottom-right of the unit. In the original iPad, the speakers push sound through two small sealed channels leading to the three audio ports carved into the device, [15] while the iPad 2 has its speakers behind a single grill.[11] A volume switch is on the right side of the unit. A 3.5-mm TRRS connector audio-out jack on the top-left corner of the device provides stereo sound for headphones with or without microphones and/or volume controls. The iPad also contains a microphone that can be used for voice recording.
The built-in Bluetooth 2.1 + EDR interface allows wireless headphones and keyboards to be used with the iPad.[70] However iOS does not currently support file transfer via Bluetooth.[71] IPad also features 1024×768 VGA video output for limited applications, [72] screen capture, [73] connecting an external display or television through an accessory adapter.
Battery
The iPad uses an internal rechargeable lithium-ion polymer ( LiPo) battery. The batteries are made in Taiwan by Simplo Technology ( 60% ) and Dynapack International Technology.[74] The iPad is designed to be charged with a high current of 2 amperes using the included 10 W USB power adapter and USB cord with a USB connector at one end and a 30-pin dock connector at the other end. While it can be charged by a standard USB port from a computer, these are limited to 500 milliamperes ( 0.5 amps) . As a result, if the iPad is running while powered by a normal USB computer port, it may charge very slowly, or not a
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