We use touch screens everywhere: tourist kiosks, automatic teller machines, point-of-sale terminals, industrial controls. Half a dozen vendors, plus in-house
wow gold departments at major manufacturers, produced $800 million worth in 2000. The market is growing because the
wow goldinterfaces are easy-to-use, durable and inexpensive. Touch screens employ one of three physics principles for detecting the point of touch. Pressing a ¡°resistive¡± design with a
wow goldfinger or other stylus raises a voltage. In ¡°capacitive¡± models, a finger draws a minute current (this method is often used for cursor pads on notebook computers). In other designs, a finger or stylus interrupts a
wow goldstanding pattern of acoustic waves or infrared lights that blanket the surface. Resistive screens are the oldest, most widely used and least expensive, and they work with any
wow gold stylus (finger, pen). Capacitive screens must be touched by a finger or an electrically grounded stylus to
wow gold eur conduct current. Wave screens are the newest and most expensive. Surface acoustic wave screens must be touched by a finger or a soft stylus such as a pencil eraser to absorb energy; infrared screens work with any stylus. The different technologies may be
wow goldused in the same applications, although pros and cons lead to prevalent combinations: resistive screens for industrial controls and Palm Pilots; capacitive
wow goldscreens for slot machines; wave screens for ATMs and indoor kiosks. Most people are unaware of
wow gold the type of screen they are using. But tricks can help you tell, according to Frank Shen of Elo TouchSystems in Fremont, Calif., the largest U.S. maker. Push the
wow gold screen lightly with your fingernail (not your skin). If it responds, it could be resistive or
wotlk goldinfrared. In this case, place two
wow gold eur separated fingers against the screen at the same time. If
wow wotlkthe cursor moves beneath one finger, the unit is infrared (software registers
wow goldthe first touch); if the cursor moves between the fingers, it is resistive (the points are averaged). If the
wow goldunit does not respond to your fingernail, again place two separated fingers against it. If the cursor moves beneath
wow accountsone finger, the unit is acoustic wave; if the cursor moves
wow gold between the fingers, it is capacitive