The Technology of Touch Screen Computers
Touch Screen Tablet Computers
Touch screen tablet computers completely remove the use of a keyboard. They are controlled fully by a stylus or a finger and allow for easier ways of using a computer. A keyboard is not the best way to write and with handwriting recognition software you may be able to step back from the keyboard and write instead. Writing is more well known and it means that a new user does not need to be fumbling around trying to find a particular key. The most popular of these touch screen computers is the iPad.
What does optical touch do? It allows for multitouch with great precision and accuracy on a touch screen computer, and with any stimulus. This means that both a finger with and without a glove can use it. You will also be free from having to press down hard to try get a response. Optical touch is able to register even the lightest of touches on a touch screen computer. It is also relatively cheap compared to many over mechanisms. It registers where someone has touched the monitor via 'sight'. In the system, a controller pad receives information from optical sensors. These optical sensors have the ability to detect any movement close to the touch screen computer. This is done because your hand interrupts the IR light that is close to the surface.
When you disrupt this light, the controller pad calculates the exact location in which the touch was on the touch screen computer. They are often on the surface of the touch screen computer monitor and these allow for extreme accuracy.
Acoustic Pulse Recognition
Acoustic Pulse Recognition touch screen computers invented by Elo is another system that can sense touches on a display. It consists of a glass layer on top of the main display. It makes use of optical qualities and also has great durability. It can use both touch by fingers and by other objects such as a stylus. It has many benefits and these include resistance to dust, water and grease. It also has a great drag ability and it is a flat touch screen computers. This means it does not take up too much space.Calibration only needs to take place once to avoid having to set it up every time you want to use it.
If you happen to scratch the screen, which can be likely, this touch screen computer will still work. It will not wear out, and the borders are very thin to give it a more professional look. It can be useful in many different roles such as in offices, pharmacies and restaurants.
Lastly there is the capacitive system. A metallic layer is above the glass on the monitor of the touch screen computer. This layer holds the electrical charge, but it is released when a person touches the monitor. It is moved to the user. This causes the capacitive layer to decrease in electrical charge, and this can be measured at all four corners of the touch screen computer monitor. By calculating how far from each corner the touch was via the decrease in circuits, the location of touch can be calculated. This is then related back to the touch screen computer driver software.
A large amount of light is transmitted from touch screen computers using this capacitive system. Though it is 10% less than the surface acoustic wave system, it is almost 15% more than the resistive system. This means that the capacitive system have very clear images, making it suitable for high graphical images. Touch screen computers using this system can only work with a conductive stimulus, such as a finger.