What is Multi-Touch Screen ?
On touchscreen displays, multi-touch refers to the ability to simultaneously register three or more distinct positions of input touches. It is often used to describe other, more limited implementations, like Gesture-Enhanced Single-Touch, Dual-Touch or real Multi-Touch.
The most popular form are mobile devices (iPhone, iPod Touch), touchtables (Microsoft Surface) and walls. Both touchtables and touch walls project an image through acrylic or glass, and then back-light the image with LEDs. When a finger or an object touches the surface, causing the light to scatter, the reflection is caught with sensors or cameras that send the data to software which dictates response to the touch, depending on the type of reflection measured. Touch surfaces can also be made pressure-sensitive by the addition of a pressure-sensitive coating that flexes differently depending on how firmly it is pressed, altering the reflection. Handheld technologies use a panel that carries an electrical charge. When a finger touches the screen, the touch disrupts the panel's electrical field. The disruption is registered and sent to the software, which then initiates a response to the gesture.
In the past few years, several companies have released products that use multi-touch. In an attempt to make the expensive technology more accessible, hobbyists have also published methods of constructing DIY touchscreens.
Source: WikiPedia.org
On touchscreen displays, multi-touch refers to the ability to simultaneously register three or more distinct positions of input touches. It is often used to describe other, more limited implementations, like Gesture-Enhanced Single-Touch, Dual-Touch or real Multi-Touch.
In the past few years, several companies have released products that use multi-touch. In an attempt to make the expensive technology more accessible, hobbyists have also published methods of constructing DIY touchscreens.
Source: WikiPedia.org
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