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Touch screen

Touch screen






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    Touch screen Touch screen Presentation Transcript

    • Touch Screen Sensors
      • Thomas Shupe
      • ECE 5320 Mechatronics
      • Assignment #1
    • Outline
      • References
      • To explore further
      • What are touch screen sensors
      • Different types touch screen sensors
      • Working principles
      • Major applications
      • Cost
      • Where to buy
    • References
      • http://en.wikipedia.org/wiki/Touchscreen
      • http://www.touchscreens.com/intro-anatomy.html
      • Research Note on Touch Screen Sensors by Andrew Nathanson
      • http://www.wisegeek.com/what-are-touch-screen-monitors.htm
    • To Explore Further
      • http://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183_gci214510,00.html
      • http://www.howstuffworks.com/question716.htm
      • Multi-Touch Interaction Research
      • by Jeff han http://cs.nyu.edu/~jhan/ftirtouch/
    • What are Touch Screen Sensors?
      • “ A Touchscreen is a display which can detect the location of touches within the display area. This allows the display to be used as an input device, removing the keyboard and/or the mouse as the primary input device for interacting with the display's content.”
      • http://en.wikipedia.org/wiki/Touchscreen
    • Types of Touch Screen Sensors
      • External add on touch screens
      • Integrated Touch Screen Monitors
    • External Add On Touch Screen Sensor
      • Can be added to your home computer
      • Brings touch screen technology to the common user
    • Integrated Touch Screens
      • The sensor system is already integrated into the screen or monitor
    • Working Principles http://www.touchscreens.com/intro-anatomy.html
      • A clear touch sensor is placed over the viewable video screen
    • Working Principles
      • A controller (2) takes information from the touch screen (1)
      • The info is turned into information the computer can understand
      • A software driver is needed to allow the touch screen and computer to work together (3)
    • Working Principles Multiple Types of Touch Sensors
      • Resistive
      • Surface Acoustic Wave
      • Capacitive
      • Infrared
      • Strain Gage
    • Resistive
      • Composed of several layer including two metallic layers separated from each other
      • When metallic layers are connected (touched) they act as like 2 voltage dividers
      • Change in electric current is sent to controller and the location is determined
    • Surface Acoustic Wave
      • Uses Ultrasonic waves across the surface
      • When the screen is touched part of the wave is absorbed
      • This allows the controller to determine the position of the touch
    • Capacitive
      • Coated with a current
      • conducting material
      • Sensor has a precisely controlled field of stored electrons in horizontal and vertical directions
      • Humans also exhibit capacititance
      • A controller detects when there is a disturbance in the electric field (touch)
      • The controller then determines the location
    • Infrared
      • An array of infrared sensors are placed horizontally and vertically
      • The sensors send out pulses of light
      • The sensors detect the interruption of the light
      • The location is then determined by the controller
    • Strain Gage http://etestinc.com/db4/00336/etestinc.com/_uimages/strainguage.bmp
      • Screen is mounted on four springs one at each corner
      • Deflection of screen when touched is measured by all four strain gages
      • Calculations are made based on each of the four deflections to determine the location of the touch
    • Typical Applications
      • Credit Card Scanners
    • Typical Applications
      • Consumer Electronics
      • Phones
      • PDA’s
      • Digital Cameras
      • GPS
      • etc
      www.trafficdominatetricks.com/jv/prizes.htm techwoo.com/hp-ipaq-112-classic-pda-phone/ http://migs.wordpress.com/2007/06/28/new-touch-screen-phones/
    • Typical Applications
      • ATM
      http://www.acceptvisaandmastercard.com/assets/images/atm1.jpg Interactive Kiosks and learning stations http://www.mce-sign.com/images/produits_multimedia/kaori.gif Etc. Etc. Etc.
    • Cost
      • Overlay screen $169 - $299
      • Integrated Touch Screen Monitor
        • 12” LCD $609
        • 17” Monitor $539
        • 42” LCD $4872
    • Where To Buy
      • www.touchscreens.com
      • http://www.ezscreen.com/
      • http://www.abilityhub.com/mouse/touchscreen.htm