The first system that is used to recognize a person’s touch is the resistive system. In that two metallic layers cover the glass screen. One of them is conductive and one of them is resistive (curiosity.com). Another fact about how touch screens work is when the two layers of metallic are at rest, they are held slightly apart by spacers and then scratch resistant material covers the whole screen (curosity.com). The last part of the resistive system is when you press down on the screen the two metallic layers touch one another in the placed you pressed altering their electric fields. The computer calculates the coordinates of that spot and the device registers your touch accordingly with the software (curiosity.com).
The second basic system is the capacitive system. The capacitive system works for making touch screens because it uses a panel of glass that is covered by an electrically charged layer (curiosity.com). At the point where your fingers make contact with the screen some electricity leaves the device and comes into your body and through your finger top and since there is only a very small amount of electricity it does not shock you. (curiosity.com). The second way that the capacitive system works is that circuits are placed in the corner of the monitor detect the decreases in charge and relay that information into the computer (curiosity.com). The last way the capacitive system works is that the computer uses all the relative difference in each circuits charge to calculate where you touched the screen (curiosity.com). That information is sent to the touch screens driver software and then that moves the cursor (curiosity.com).
The last basic system is the surface acoustic wave system. The first way the surface acoustic wave system works is that it has four transducers one sending and one going at each end of the X axis and two more going at each end of the Y axis (curiosity.com). The second way the surface acoustic wave system works is that within the grid of the screen are reflectors that take the electrical signal sent from one transducer to the other (curiosity.com). Finally the last way the surface acoustic wave system works is that when you touch this kind of screen you disrupt the current reading for the receiving transducer. The location of this disruption is detected instantly and is relayed to the computer (curiosity.com).
In conclusion, when you have a science or technology question I suggest to do some research because you could learn a lot like I did. I enjoyed learning about the three basic systems that make a touch screen work and I hope to do something like this again.
Curiosity “resistive system” http://curiosity.discovery.com/question/touch-screens-resistive-system-recognize
Curiosity “capacitive system” http://curiosity.discovery.com/question/touch-screens-capacitive-recognize-touch
Curiosity “surface acoustic wave system” http://curiosity.discovery.com/question/surface-acoustic-wave-system-recognize
Retrieved on 2/6/14