01-09-2016, 03:43 PM
1452188075-touchscreentechnologyppt.pptx (Size: 391.07 KB / Downloads: 9)
What are Touch Screens?
It is the most user friendly input device used to interface with a PC.
The user touches the screen to select options presented on it, where associated hardware and software locate that touch.
History and Development
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.
Why use Touch Screens?
Enable first-time users to interface with computers instantly, without any training.
Eliminate operator errors because users make selections from clearly defined menus.
Eliminate keyboards and mice, which many novice users find difficult to use.
Rugged enough to stand up to harsh conditions where keyboards and mice can be damaged.
Provide fast access to all types of digital content.
Ensure that no space is wasted since the input device is completely integrated into the monitor
Touch sensor
A touch screen sensor is a clear glass panel with a touch responsive surface which is placed over a display screen so that the responsive area of the panel covers the viewable area of the display screen.
The sensor generally has an electrical current or signal going through it and touching the screen causes a voltage or signal change. This voltage change is used to determine the location of the touch to the screen
Controller
The controller is a small PC card that connects between the touch sensor and the PC. It takes information from the touch sensor and translates it into information that PC can understand.