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Tactile devicesHenri LegentilThomas Zubeli
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Introduction
•Why this topic?
•What is included in “tactile devices”?
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
Resistive•Technical explanation
•Pros & cons
•Applications
Resistive – Technical explanation•Composition of a resistive touch screen:
Resistive – Technical explanation•More detailed view of a resistive device:
Resistive – Pros & Cons•Pros:
▫Cheap▫Durable
•Cons:▫Bad clarity
Resistive – Applications•Nintendo DS
•PDA
•Mobile Phone (i.e. HTC)
•GPS
•Touchpad
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Capacitive•Technical explanation
•Pros & cons
•Applications
Capacitive – Technical explanation•Composition of capacitive touch screen:
Capacitive – Technical explanation•The screen
Capacitive – Technical explanation•The screen
Capacitive – Technical explanation•The screen
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
Capacitive – Application•iPhone•Ticketing machine
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Surface acoustic
•Technical explanation
•Pros & cons
•Applications
Surface acoustic – Technical explanation
•Wave through an elastic material
Wikipedia
Surface acoustic – Pros & Cons
•Pros▫Usable with everything▫Perfect image
•Cons▫Fragile
Surface acoustic – Application
•Graphic design
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Strain gauge
•Technical explanation
•Pros & cons
•Applications
Strain gauge – Technical explanation
•Screen spring-mounted
•Flexible resistance
Wikipedia
Strain gauge – Pros & Cons
•Pros▫Z-axis measurement▫Resistant▫Movement▫Usable with everything
•Cons▫Accuracy
Strain gauge – Applications
•Exposed public systems
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Optical imaging•Technical explanation
•Pros & cons
•Applications
Optical imaging – Technical explanation•Composition of optical imaging touch
screen:
Optical imaging – Technical explanation•Composition of optical imaging touch
screen:
Optical imaging – Pros & Cons•Pros
▫No pressure is required▫Provides multi-touch capability▫Plug-and-play
•Cons▫Needs to be calibrate
Optical imaging – Applications
•Military applications
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Dispersive signal
•Technical explanation
•Pros & cons
•Applications
Dispersive signal –Technical explanation
3M.co.uk
Dispersive signal – Pros & Cons
•Pros▫Accurate▫Object resting on screen ignored▫Resistant▫Usable with everything
•Cons▫A bit slow▫No movement
Dispersive signal – Applications
•Exposed public systems
•Long use purpose
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Acoustic pulse recognition (APR)•Technical explanation
•Pros & cons
•Applications
APR – Technical explanation•Composition of a APR screen:
APR – Technical explanation•Composition of a APR screen:
APR – Pros & Cons•Pros
▫Plug-and-play▫Works with gloves, fingernails▫Resistant to water
•Cons▫Drag-and-drop doesn’t always work well
APR – Application•Restaurants
Outline• Introduction•Definition•History•Digital technologies:
▫Resistive▫Capacitive▫Surface acoustic▫Strain gauge▫Optical imaging▫Dispersive signal▫Acoustic pulse recognition
•Conclusion
Conclusion
•Gorilla arm
•State-of-art
•Market projection
Thank you!
Questions?
