20-10-2010, 03:20 PM
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touch screen technology
• A touch screen is an input device that allows users to operate a PC by simply touching the display screen.
• The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it.
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• A touch screen is based on CRT (Cathode Ray Tube) technology that accepts direct onscreen input.
• The ability for direct onscreen input is facilitated by an external (light pen) or an internal device (touch overlay and controller).
• History and Development Of
Touch Screen
• In 1971 Dr. Sam Hurst, founder of Elographics developed the first touch opaque sensor “Elograph” at the University of Kentucky.
• In 1974 He developed the first real touch screen.
• In 1977, Elographics developed the five-wire resistive technology then with the backing of Siemens Corporation, developed a curved glass sensor called the touch screen.
• The new transparent technology, AccuTouch, was later developed by the founders of Elographics, Dr. Hurst and Bill Colwell.
• How Does a Touch Screen Work?
• A basic Touch Screen has three main components:
• 1) Touch sensor.
• 2) Controller.
• 3) Software driver.
• The Touch Screen is an input device, so it needs to be combined with a display and a PC or other device to make a complete touch input system.
• Controller
• The controller connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand. The
