Touchscreens

(1) Resistive:- Resistive touchscreen displays are composed of multiple layers that are separated by thin spaces. Pressure applied to the surface of the display by a finger or stylus causes the layers to touch, which completes electrical circuits and tells the device where the user is touching. As such, resistive TS require much more pressure to activate than capacitive TS. Examples:- HTC Touch Diamond, Samsung SGH-i900 Omnia.

(2) Capacitive:- Capacitive touchscreen displays rely on the electrical properties of the human body to detect when and where on a display the user touching. Because of this, capacitive displays can be controlled with very light touches of a finger and generally cannot be used with a mechanical stylus or a gloved hand. Examples of devices with capacitive touchscreens are the Apple iPhone and the T-Mobile G1.

(3) Multi-touch:- Multi-touch is a method of input on a touchscreen that allows two or more fingers to be used on the screen at one time. Apple’s iPhone is famous for introducing multi-touch to the cell phone world by using it to allow pinching and stretching gestures on the screen to control zooming. Multi-touch is something typically associated with capacitive TS displays rather than with more common resistive TS displays.

(4) Other:- Other touchscreen types that use infrared light grids, sound, or optical sensors also exist, though they are not typically used in cell phones.

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