Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Outline• Introduction• Definition• History• Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
• Conclusion
Definition
•“Device fitted with a system which enables to execute actions by finger-pointing areas on a delimited zone.”
•General structure:
Sensors
Controller
Softwar
e
Outline• Introduction• Definition• History• Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
• Conclusion
History• 1960s: Academic & corporate researches
• 1971: 1st “touch sensor” by Sam Hurst (founder of Elographics): “Elograph”
• 1974: 1st transparent touch screen
• 1983: 1st commercial touch screencomputer HP-150
• 1970s-1980s:all significant technologies columbia.e
du
Outline• Introduction• Definition• History• Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
• Conclusion
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Capacitive – Pros & Cons•Pros
▫High touch resolution▫High image clarity▫Not affected by dirt, grease, moisture
•Cons▫Must be touched by finger, will not work
with any non-conductive input
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Strain gauge – Pros & Cons
•Pros▫Z-axis measurement▫Resistant▫Movement▫Usable with everything
•Cons▫Accuracy
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Optical imaging – Pros & Cons•Pros
▫No pressure is required▫Provides multi-touch capability▫Plug-and-play
•Cons▫Needs to be calibrate
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Dispersive signal – Pros & Cons
•Pros▫Accurate▫Object resting on screen ignored▫Resistant▫Usable with everything
•Cons▫A bit slow▫No movement
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
APR – Pros & Cons•Pros
▫Plug-and-play▫Works with gloves, fingernails▫Resistant to water
•Cons▫Drag-and-drop doesn’t always work well
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion