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Touchscreen

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Information about Touchscreen
Technology

Published on February 23, 2014

Author: fazleqadirchimthanawala

Source: slideshare.net

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By – Fazle Qadir Chimthanawala

A touchscreen is an electronic visual display that the user can control through simple or multi-touch gestures by touching the screen with a special stylus/pen or one or more fingers. The touchscreen enables the user to interact directly with what is displayed, rather than using a mouse, touchpad, or any other device other than a stylus. Touchscreens are common in devices such as game consoles, all-inone computers, tablet computers, and smartphones. They can also be attached to computers or, as terminals, to networks.

Touch screens emerged from academic and corporate research labs In 1971, the first "Touch Sensor" was developed by Doctor Sam Hurst (founder of Elographics) while he was an instructor at the University of Kentucky. This sensor was known as “Elograph”. Touch screens first gained some visibility with the invention of the computer-assisted learning terminal, which came out in 1975 as part of the PLATO project(Programmed Logic for Automatic Teaching Operations)[.

Touch sensor Controller Software driver

Resistive Surface acoustic wave Capacitive Infrared grid Infrared acrylic projection Acoustic pulse recognition Dispersive signal technology Optical imaging

Composed of several layers Two Electrically conductive layers

It uses ultrasonic waves. When the panel is touched, a portion of the wave is absorbed.

Consist of an insulator such as glass Coated with transparent conductor such as ITO (Indium Tin Oxide) Touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance.

An infrared touch screen uses an array of X-Y infrared LED and photo detector pairs around the edges of the screen to detect a disruption in the pattern of LED beams.

User friendly Fast response Error free input Use finger , fingernail , gloved hands , stylus or any soft tip pointer Easy to clean Does not interfere mouse and keyboard Make computing easy , powerful and fun It benefits children

Finger stress Fingerprints Screen has to be really big not to miss things when pressing them with your finger Big screen leads to low battery life Touch screen means screen can’t be read too well in direct sunlight as it is not 100% transparent.

Driving lines carry current. Sensing lines detect the current at nodes.

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