Virtually all mobile phones have an integrated display device, some with touch screen function. The main measurements for screen size varies greatly by model.
Manufacturers use different methods to specify display size, usually width and height in pixels or the diagonal measured in inches.
In 2011, a 3G Android Smart phone was launched with dual 3.5 inch screens. Furthermore, the screens can be combined into a single 4.7 inch which turns it into a Tablet computer. It uses a single Snapdragon processor.
A display device is an output device for presentation of information in visual or tactile form (the latter used for example in tactile electronic displays for blind people). When the input information is supplied as an electrical signal, the display is called an electronic display.
Some displays can show only digits or alphanumeric characters. They are called segment displays, because they are composed of several segments that switch on and off to give appearance of desired glyph. The segments are usually single LEDsor liquid crystals. They are mostly used in digital watches and pocket calculators. There are several types:
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