TOUCHSCREEN TECHNOLOGY

BY :- JITAMITRA MOHANTY 1141016336 ECE-C

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CONTENTS

• INTRODUCTION• HOW DOES IT WORKS?• TOUCH SCREEN TECHNOLOGIES• USAGE• MULTI-TOUCH TECHNOLOGY• ADVANTAGES• DISADVANTAGES• CONCLUSION

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INTRODUCTION

A touch screen is an input device that allows users to operate a device by simply touching the display screen.

The term generally refers to touch or contact to the display of the device by a finger or hand.

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[ref-Google images]

Working of Touchscreen

Main Components : - Touch Sensor Controller Drivers

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Touch Sensor• A touch screen sensor is a clear glass panel with a touch responsive surface.• The sensor generally has an electrical current or signal going through it and

touching the screen causes a voltage or signal change.

[ref-Google images]

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Controller• The controller is a small PC card that connects between the touch sensor and

the PC.• The controller determines what type of interface/connection you will need on

the PC.

[ref-Google images]

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Drivers• The driver is a software that allows the touch screen and computer to work

together.• Most touch screen drivers today are a mouse-emulation type driver.

[ref-Google images]

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TOUCH SCREEN TECHNOLOGIES

Resistive touch screen

Capacitive touch screen Surface capacitive

Projected capacitive Infrared touch screen

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Touchscreen TechnologyResistive Touch:• A resistive touchscreen panel comprises several layers, the

most important of which are two layers.

• One is conductive layer and resistive layer separated by tiny dots called spacers.

• An electric current flows between the two layers.

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Continued…… Resistive touch screen deliver:• cost-effective• Durable • Consistence performance

[ref-3]

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CAPACITIVE TOUCH SCREEN• A capacitive touch screen

panel is one which consists of an insulator such as glass, coated with a transparent conductor such as Indium tin oxide (ITO).

• As the human body is also a conductor, touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance.

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[ref-4]

INFRARED TOUCH SCREEN

• An infrared touch screen uses a ray of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams.

• These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch.

• A major benefit of such a system is that it can detect essentially any input including a finger, gloved finger, stylus or pen.

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[Ref-wikipedia]

Infrared Touch Screen

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[ref-5]

USAGE Finger stress: With stressing the finger on the

desired area of the touch screen, the input is taken by the sensors of the screen.

Finger nail as stylus: With the help of touching the screen

with the finger nail which acts as the stylus, input can be taken by the sensors.

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MULTI-TOUCH TECHNOLOGY• On touch screen displays, multi-touch refers to

the ability to simultaneously register three or more distinct positions of input touches.

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ADVANTAGES

User friendlyFast responseError free inputUser finger, finger nail, gloved hand,

stylus or any soft tip pointer to operate Make computing easy, powerful and

fun

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DISADVANTAGESFinger stress: Stress on human fingers when

used for more than a few minutes at a time. (for example, ATMs).

Fingerprints: Touch screens can suffer from

the problem of fingerprints on the display.

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CONCLUSION

Though the touch screen technology contains some limitations with it, it is fast, accurate, user friendly and fun to operate .It is being widely accepted. With some modifications, it can completely replace mouse and keyboard completely in the near future.

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REFERENCES[1]“Company history from Elographics to Elo TouchSystems, 1971 - present - Elo

TouchSystems - Tyco Electronics”. www.elotouch.com. http://www.elotouch.com/AboutElo/History/default.asp. Accessed 3 March 2010.

[2]“The HP-150”. www.columbia.edu. http://www.columbia.edu/acis/history/hp150.html. Accessed 3 March 2010.

[3]Hsu, Andrew. "Choosing a touch technology for handheld-system applications." EDN, January 8, 2009: 40-44.

[4]Nichols, Steven J. Vaughan “New Interfaces at the Touch of a Fingertip” [5]Izadi, Shahram, et al. "ThinSight: A Thin Form-Factor Interactive Surface

Technology." Association for Computing Machinery. IEEE Society August. 2007: 12-15. http://en.wikipedia.org/wiki/touchscreen

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