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PRESENTED BY: VISHWAS MALIK

(0906810117)CS-B

MIET

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ABSTRACT The touch screen is an assistive technology. This

interface can be beneficial to those that have difficulty in using other input devices such as a mouse orkeyboard.

When used in conjunction with software such as on-screen keyboards, or other assistive technology, they

can help make computing resources more available topeople that have difficulty in using computers.

Touch screen based system allows an easy navigationaround a GUI based environment.

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CONTENT INTRODUCTION

TYPES OF TOUCH SCREEN

COMPONENTS WORKING

ADVANTAGES AND DISADVANTAGES

APPLICATIONS

CONCLUSION

REFERENCES

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INTRODUCTIONWhat is a Touch Screen?

A touch screen is an Electronic Visual Display that

can detect the presence and location of a touch withinthe display area.

OR

A touch screen is an Electronic Visual Display that

responds when it detects a touch on its Surface

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Evolution of Touch screen The touch screen was derived from the digitizing

tablet. The digitizing tablet was invented by Sam

Hurst in 1971. It was designed to allow scientists torecord data from graphs by placing the graph onthe tablet and pressing the paper against the tablet

with a stylus.

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TYPES OF TOUCH SCREEN Resistive touch screen

Capacitive touch screen

Infrared touch screen

Surface acoustic wave (SAW) touch screen

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Resistive touch screen

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Resistive LCD touch screen monitors rely

on touch overlay, which is composed of aflexible top layer and a rigid bottom layerseparated by insulating dots, attached to atouch screen controller.

Resistive touch screen panels are generally more affordable but offer only 75% clarity and the layer can be damaged by sharpobjects. Resistive touch screen panels arenot affected by outside elements such asdust or water.

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Capacitive touch screen

A capacitive touch screen panel is coated with a material that stores electrical charges. When the panel is touched, a small amount

of charge is drawn to the point of contact.

Capacitive touch screens have excellentclarity, and there are no moving parts to

wear out. Liquids, dirt, grease, or othercontaminants do not affect them.

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Infrared touch screen An infrared touch screen uses an array of X-Y infrared LED and photo detector pairs around theedges of the screen to detect a disruption in thepattern of LED beams.

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SAW touch screen

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The Surface Acoustic Wave (SAW) technology is one of the most advanced touch screen types. The technology is

based on two transducers (transmitting and receiving)placed for the both of X and Y axis on the touch panel.

The Surface Acoustic Wave technology isrecommended for ATMs, Amusement Parks, Banking

and Financial Applications, public information kiosks,computer based training, or other high traffic indoorenvironments.

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Component Touch Sensor

Controller

Software Driver

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TOUCH SENSORS

Touchsensor

Covering screen

A touch screen sensor is a clear glass panel with a touch responsive surface.

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CONTROLLER [Resistive] NAME:

VS20UA CONTROLLER

Supply Voltage 5.0V DC

Maximum Current

20mA

Resolution 12-bit

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CONTROLLER [Capacitive] Name:

5000 RSU SERIALCONTROLLER

Supply Voltage: +5 V DC or +12V

Baud Rate 9600 (default) and 19200

Touch Resolution

12bit, size independent. Conversion Time

Approximately 15 ms percoordinate set

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SOFTWARE DRIVER

The driver is a software update for the PC system that

allows the touch screen and computer to worktogether.

It tells the computer's operating system, How tointerpret the touch event information that is sent fromthe controller.

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WORKING Touch screens are activated by the insertion or removal of

the fingertip or by pressing the controls, active areas ortargets with a head stick, or other similar device (stylus).

Resistive touch screens are pressure sensitive, so they canbe operated with any input device, including a gloved handor stylus.

Capacitive touch screens offer higher clarity and are moredurable, but they do not respond to gloved hands or moststyluses.

Infrared touch screens are based on light-beaminterruption technology.

Surface Acoustic Wave (SAW) is a newer technology thatuses ultrasonic waves that pass over the screen.

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Advantages Touching a visual display of choices requires little

thinking and is a form of direct manipulation that iseasy to learn.

Touch screens are the fastest pointing devices.

Touch screens have easier hand eye coordination thanmice or keyboards.

No extra work space is required as with other pointingdevices.

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Disadvantages User's hand may obscure the screen.

Screens need to be installed at a lower position andtilted to reduce arm fatigue.

Some reduction in image brightness may occur.

They cost more than alternative devices.

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Applications Public information displays

Tourism displays Trade show display Awareness kiosks

Customer self service General departmental Stores Restaurants ATM Airline ticket terminals

Other uses Digital jukeboxes Computerized gaming Student Registration systems

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CONCLUSION AND FUTURE SCOPE The touch screen interface is easier to use than other

input devices.

It is useful to make information more easily accessibleby allowing user to navigate by simply touching thedisplay screen.

Some laptops do include multi-touch capabilities;

however, these capabilities are very limited and notreally useful.

The future of touch surface is touch screen videoprojectors.

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So What ‘s Next…….

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