Touch screen monitors are now used in shops, cars, laptops, and mobile devices. They offer convenience and eliminate the need for additional input devices. There are three types of touch screens: resistive, capacitive, and surface acoustic waves. Each has its benefits and manufacturers will continue to find new ways to use them.
Touch screen monitors are no longer limited to video games as a novelty. Today they are found in many shops as part of cash registers, in car dashboards and on many laptop computers. With the growing popularity of Palm Pilots and other touch screen-enabled PDAs, many people always have one in their pocket.
The advantages of this technology are obvious. Rather than lugging around additional input devices such as a mouse or keyboard, the user only needs his or her finger to manipulate the chosen device. But it’s not just mobile devices that benefit from this type of input. You can equip all kinds of devices, including TVs and computer monitors, LCD screens and older CRT computer monitors. As a result, a bartender can press on a screen to ring out drinks on a busy night instead of typing in a price, a nurse can enter patient information with one hand. Really, the possibilities with touch screen monitors are endless.
Touch screen monitors usually come in three varieties that allow them to recognize a person’s touch. These are resistive, capacitive and surface acoustic waves. The resistive type works by having two panels with a thin gap between them. When the user presses on the screen, the two panels touch at that point and the exact coordinates are then recorded on the computer.
A capacitive system carries a small electrical charge throughout the touch screen. When the user touches the chosen area, some of the electrical charge is distributed to the finger, reducing the charge at that location. The coordinates are recorded again and sent to the computer. This type of touch screen produces a clearer picture because it transmits more light and doesn’t require two panels.
Finally, the surface acoustic wave system is the best and produces a clearer image. Transducers are used to send electrical signals across the screen, and if a user touches the screen, he or she can determine where based on how the electrical signal is received from one transducer to another.
Since the capacitive system must have a finger to absorb electricity, most non-living objects will not register as touch. Resistive and surface acoustic wave systems, on the other hand, react to any form of pressure. Each consequently has its different benefits, and manufacturers will only find new ways to use them.
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