The use of multi-touch technology in touch screen computers is a more advanced mechanism, allowing for more actions and involvement with the image. The touch can be recognised in more than one point at once, suitable for images which can be zoomed in and out. They are currently used in Apple touch screen computers but this is not yet the full potential. This can be realised in larger screened touch screen computers. Most current touch screen computers can only locate one touch at once, but investigation is being made to increase this to the stunning amount of twenty or more.
This would be very useful touch screen computers for teachers. An interactive whiteboard which can be used by multiple students at once would be useful to include in lesson plans. This proves that touch screen computers can go past the home into a more educational setting. This is not possible in smaller devices ad it simply does not have the space to accommodate so much touch at once. It can also be used in business settings, and these touch screen computers can be used for brainstorming. In games development and 3D design, multiple collaborators could work together to mould a face of a character. This makes it a very important piece of engineering. It is not only the whiteboard that multitouch is to be used in, it is envisioned that touch screen computers which have multitouch to be incorporated into tables. Though it is not yet widespread, it is a touch screen computer that you can be sure to look out for in the future.
There had been different methods in producing a multi-touch screen. The earlier multi-touch touch screen computers used monitors which calculated the change in capacitance or electrical resistance in multiple fingers which touched it. The resolution of these touch screen computer is limited and are very difficult to produce due to their complexity. It cannot be used on larger touch screen computers due to the expense and difficulty of the operation. It is yet to be known whether this is the technology for touch screen computers which Apple uses for their iPhone.
Using another mechanism, these larger scaled touch screen computers are made of see through acrylic. Diodes which give out light are placed on each of the four edges and these light up this acrylic with infrared Light. Internal reflection usually takes place due to the emitted light, this meaning that the light travels along already known paths. Yet when someone touches the touch screen computer, the path of light diffuses at this point. This means it cannot continue along the known travel pathways but diffuses into the surface. It is not allowed to diffuse into the atmosphere, as also on the touch screen computer is a camera. This camera captures these light reflections and it is seen as a touch or a pinch, or whatever the touch screen computer is designed to do.
It means that, as technology in the multi-touch field improve, there may be less need for a mouse and keyboard. Touch screen computers are becoming more and more advanced, and in the process becoming more suitable for all sorts of jobs. These developments are important for this reason.
In the future, this may not be all. Touch screen computers with their rapid development may one day be able to touch back, due to Haptics. This doesn't mean you are physically being touched through the screen, but when you touch a particular point, it will cause the screen to vibrate.