Touch Screen Monitors Know Where We Touching
By : Manfee
Touch screen technology has been around since the 1970s and there are several companies that manufacture touch screen equipments. A touch screen display has three primary components that allow it to function: the touch sensor, the controller, and the software driver. There are several touch sensitive technologies applied in manufacturing touch-screen displays. A resistive touch screen display is one where a thin metallic resistive layer acts as the main sensory layer. The other alternative, the surface wave touch screen, uses ultrasonic waves. These waves pass over the touch panel. Some waves are absorbed when a user touches the screen. Touch screen technology uses advanced principles of physics but the touch screen simplifies communication tremendously.
How do touchscreen monitors know where we touching ?
The resistive system consists of a normal glass panel that is covered with a conductive and a resistive metallic layer. When a user touches the screen, the two layers make contact in that exact spot. In the capacitive system, a layer that stores electrical charge is placed on the glass panel of the monitor. One advantage that the capacitive system has over the resistive system is that it transmits almost 90 percent of the light from the monitor, whereas the resistive system only transmits about 75 percent. This gives the capacitive system a much clearer picture than the resistive system.
This makes the surface acoustic wave system best for displaying detailed graphics (both other systems have significant degradation in clarity).
A resistive system registers a touch as long as the two layers make contact, which means that it doesn't matter if you touch it with your finger or a rubber ball. The surface acoustic wave system works much like the resistive system, allowing a touch with almost any object -- except hard and small objects like a pen tip.
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