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Touchscreen

touchscreen is the technology that allows you to touch something on a screen and see something happen as a result. A resistive system works by using a layer of glass and a layer of metal. there is an electrical current running through the middle. when a person touches the glass, the two layers touch in that exact point, the electric field change is recorded, and the computer works out what that means. In the capacitive system, a layer that stores electrical charge is placed on the glass panel of the monitor. When someone touches the monitor with his or her finger, some of the charge is transferred to the person, so the charge on the capacitive layer decreases. This decrease is measured in circuits located at each corner of the monitor. The computer calculates, from the relative differences in charge at each corner, exactly where the touch event took place and then relays that information to the touch-screen driver software. 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.On the monitor of a surface acoustic wave system, two transducers (one receiving and one sending) are placed along the x and y axes of the monitor & apos;s glass plate. Also placed on the glass are reflectors -- they reflect an electrical signal sent from one transducer to the other. The receiving transducer is able to tell if the wave has been disturbed by a touch event at any instant, and can locate it accordingly. The wave setup has no metallic layers on the screen, allowing for 100-percent light throughput and perfect image clarity. This makes the surface acoustic wave system best for displaying detailed graphics (both other systems have significant degradation in clarity).