09-08-2014, 03:19 PM
Technical Seminar Presentation
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What is a touch screen?
An electronic visual display that locates the coordinates of a users touch within display area
Works independently of what is being displayed on screen
Brief History
Invented by E.A. Johnson (Royal Radar Est.) around 1965 for air traffic control
HP-150 home computer using infrared technology in 1983
1993 Apple’s Newton and IBM’s Simon
2002 Microsoft’s Windows XP Tablet
2007 Apple’s iPhone (Multi-touch)
Resistive Touch Screens
Voltage in circuit changes based on position
Controller determines location based on voltages
Any material can trigger sensors
Capacitive Touch Screens
Touch draws minute amount of current creating voltage drop
Coordinates of point of contact calculated by controller