Touch Screen

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Touch Screen Technology
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Group members
Alisha Korpal Amandeep Singh Kalsi Kirandeep Kaur
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Overview

• Introduction
• History
• Components
• Technologies
• Pros cons
• Applications
• Conclusion

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Introduction

• A touch screen is a display that can detect the
  presence and location of a touch within the
  display area.
• Touch screen can also sense other passive objects
  such as stylus.

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History

• 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.

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Contd

• This sensor, called the 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.

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Components

• A basic touch screen has three main components
• Touch sensor
• Controller
• Software driver

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Touch sensor

• A touch screen sensor is a clear glass panel with
  a touch responsive area.
• The touch sensor is placed over a display screen
  so that the responsive area of the panel covers
  the viewable area of the screen.

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Controller

• The controller connects between the touch sensor
  and the PC.
• Take information from the touch sensor and
  translate it into information that PC can
  understand.

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Software Driver

• The driver allow the touch screen and computer to
  work together
• This makes touching the screen as same as
  clicking the your mouse at the same location on
  the screen.

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Technologies

• Resistive
• Surface acoustic wave
• Capacitive
• Infrared
• Optical Imaging

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Resistive

• composed of several layers
• Two Electrically conductive layers

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Surface acoustic wave

• uses ultrasonic waves
• Surface wave touch screen panels can be damaged
  by outside elements.
• When the panel is touched, a portion of the wave
  is absorbed.

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Open Frame SAW Touch Monitor
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Capacitive

• 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.

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Infrared

• 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.

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Optical imaging

• In this two or more image sensors are placed
  around the edges of the screen. A touch shows up
  as a shadow and each pair of cameras can then be
  pinpointed to locate the touch.

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Comparison
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PROS CONS
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PROS

• 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

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CONS

• 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 cant be read too well
  in direct sunlight as it applies an additional
  not 100 transparent
• Fatigue

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Applications

• Museums
• Library resource guides
• Corporate information
• Airport terminal passenger internet and emails
• ATMs
• Restaurants'
• Grocery stores

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Conclusion

• Designers are trying to use touch screen to
  simplify input commands
• Today , touch screen has becomes adopted by
  computers users of all abilities because it is
  simple, fast and innovative.
• In future there is no usage of mouse and
  keyboards as they will be replaced by touch
  screen.

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References

• http//www.google.co.in/qTouchscreentechnology
  as_sitesearchwikipedia.orgsaXeiLjVqTf2TL86Gr
  AfO7ujCCwved0CC4Q2wEhlenbiw1280bih869fpd
  cc4ce35a3a0f2a4
• http//www.google.co.in/sclientpsyhlensites
  ourcehpqpptsontouchscreentechnologyaq0aq
  ig1aqloqPPTsonTouchscreenfp1cadb
• http//www.scribd.com/doc/29866129/Touchscreen-tec
  hnology-ppt-by-pavan-kumar-M-T
• http//wiki.fluidproject.org/display/fluid/Benchma
  rking-TouchScreenOptions

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Thank you