PRESENTED BY:

KARTHIKA ASOK

13093439

S7,E.C

GUIDED BY:

MISS KRISHNA J

(LECTURER, ECE,SIST)

۞ 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

۞ Ordinary touch screen

۞ TPaD- Tactile Pattern Display

۞ Application

۞ Advantage

۞ Disadvantage

۞ Future scope

۞ Conclusion

۩ Can detect the presence and location of a touch

۩ 3 main components

۞ Touch sensor

۞ Controller

۞ Software driver

۩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

۩ Controller

۞ Small PC card ; connects PC & Touch sensor

۞ Usually installed inside the monitor

۞ Controller determines what type of interface/connection needed

۩ Software driver

۞ Mouse -emulation type driver

۞ Controller Driver O.S

Available touch

technology

Analogueresistance

Basedsensor

Capacitive-Based

overlaysensor

Acoustic wave

sensors

Optical or

infrared

Near field

technology(Mechanical

force)

۞ Plastic overlays degrade image quality

۞ More susceptible to damage

۞ They require frequent calibration

۞ No feelings

۞ Directness

۞ Fast access

ADVANTAGES DISADVANTAGES

۞ 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………..

۞ 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

۞ 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

CHARACTERISTICS OF TPaD

Piezo bending element and mount

۞ BENDING ELEMENT CONSTUCTION

۞ DRIVING ELECTRONICS

Vibration mode of bending element.

۞FINGER POSITION TRACKING

۞ VIRTUAL TEXTURES

۩ FOR BLINDS:

An electrostatic haptic display Electrotactile display of computer graphics

GraphiGlove — A tactile glove for computer graphics

VTD - Virtual Tactile Display

۩ 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

۩ Public & information displays

۩ Retail & restaurant system

۩ Control & automation system

۩ Used as navigation aid

۩ Computer based training

۩ Virtual reality keyboard

۩ Assistive technology

۩ Tactile display cloth

۩ Advertisement

۞ 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

۞ Large content suite & cost-effective ۞ Suitable for any commercial environment

۞ Can be used with projectors / LCD TVs

۞ The perfect advertising medium

۞ High power consumption

۞ Reduce power consumption

۞ TPaDs having much large surface area

۞ 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.

.

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