touch screen with feelings-t-pad
TRANSCRIPT
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PRESENTED BY:
KARTHIKA ASOK
13093439
S7,E.C
GUIDED BY:
MISS KRISHNA J
(LECTURER, ECE,SIST)
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۞ The theory, design and construction of a haptic display.۞ Creating texture sensations through variations in surface friction۞ Ultra sonic frequency, low amplitude vibrations between two flat plates۞ A reduction of friction will also occur between a human finger and a vibrating plate۞ Vibrating plate Haptic interface۞ finger position and velocity feedback on the display creation of spatial texture sensations
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۞ Ordinary touch screen
۞ TPaD- Tactile Pattern Display
۞ Application
۞ Advantage
۞ Disadvantage
۞ Future scope
۞ Conclusion
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۩ Can detect the presence and location of a touch
۩ 3 main components
۞ Touch sensor
۞ Controller
۞ Software driver
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۩Touch sensor
۞ Clear glass panel with touch responsive surface
۞ Sensor generally has an electric current/signal going through it and touching the screen cause a voltage/signal change
۞ Voltage change determines location of touch
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۩ Controller
۞ Small PC card ; connects PC & Touch sensor
۞ Usually installed inside the monitor
۞ Controller determines what type of interface/connection needed
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۩ Software driver
۞ Mouse -emulation type driver
۞ Controller Driver O.S
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Available touch
technology
Analogueresistance
Basedsensor
Capacitive-Based
overlaysensor
Acoustic wave
sensors
Optical or
infrared
Near field
technology(Mechanical
force)
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۞ Plastic overlays degrade image quality
۞ More susceptible to damage
۞ They require frequent calibration
۞ No feelings
۞ Directness
۞ Fast access
ADVANTAGES DISADVANTAGES
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۞ The name “Touch screen” is a misnomer
۞ Touch screens & Touch pads fails to provide the sense of touch of mechanical buttons, switches& Knobs
۞ They have no shape, no texture& no clickiness.
۞ They are dead to the finger
This is what the TPaD enables………..
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۞ It’s a novel technology
۞ Creating texture sensations
through variations in surface friction
۞ Create the illusion of texture on
an unadorned piece of glass
۞ The coefficient of friction between glass & finger tip is about 1
۞ It has no visible or audible texture
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۞ It uses vibration to create variable friction areas on a touch screen
۞It provides a layer of air between your finger & the screen which reduce the friction
۞ The system tracks finger position & turns the vibration on & off
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CHARACTERISTICS OF TPaD
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Piezo bending element and mount
۞ BENDING ELEMENT CONSTUCTION
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۞ DRIVING ELECTRONICS
Vibration mode of bending element.
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۞FINGER POSITION TRACKING
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۞ VIRTUAL TEXTURES
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۩ FOR BLINDS:
An electrostatic haptic display Electrotactile display of computer graphics
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GraphiGlove — A tactile glove for computer graphics
VTD - Virtual Tactile Display
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۩ FLEXIBLE TACTILE DISPLAY۞ Flexible-soft tactile display
۞ Electro active polymer
۞ Advantage- doesn't require complex electronics
Efficient power usage
Cost-effectiveness
Easy fabrication
۞ Disadvantage- low power
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۩ Public & information displays
۩ Retail & restaurant system
۩ Control & automation system
۩ Used as navigation aid
۩ Computer based training
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۩ Virtual reality keyboard
۩ Assistive technology
۩ Tactile display cloth
۩ Advertisement
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۞ Tactile feedback
۞ User friendly
۞ High accuracy results in seamless user experience
۞ Ability to distinguish between parts of the human body
۞ Secure to work in high traffic environment
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۞ Large content suite & cost-effective ۞ Suitable for any commercial environment
۞ Can be used with projectors / LCD TVs
۞ The perfect advertising medium
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۞ High power consumption
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۞ Reduce power consumption
۞ TPaDs having much large surface area
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۞ Ability of a piezoelectric bending element to perform the function of a T-PaD. ۞ The T-PaD has a broad range of controllable friction levels ۞ Texture sensations are created by both spatial shear force patterns and velocity dependent shear force patterns on the display۞ Future work can be done to reduce the power consumption۞ Then only it can be used in mobile devices which works in mW power range.
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http://efymagonline.com
Uma Gupta ”Take a tour to a world virtually real” in LFY magazine, issue jan,01,2006
J. Edward Colgate ”Tactile Pattern Display(26012/27004/27005/27025)”
http://www.wikepedia.org
http://touchmagixmedia.com
Jones W.D ”Touch screen with feelings”; Spectrum, IEEE, Vol 46,issue5,2009
http://www.seminar4you.info
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