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COMPARATIVE STUDY OF VARIOUS

TOUCH SCREEN TECHNOLOGIES

NAME: KANAKLATA & PRATHIMA

COLLEGE: MRITS

BRANCH: IT

INTRODUCTION

A touchscreenisan electronic visualdisplaythat the user cancontrol through simple ormulti-touch gesturesby touchingthe screen with one or morefingers. Some touchscreenscan also detect objects such

as a stylusor ordinary orspecially coated gloves. Theuser can use the touchscreento react to what is displayedand to control how it isdisplayed (for exampleby zoomingthe text size.

The touchscreen enables theuser to interact directly withwhat is displayed! rather thanusing a mouse! touchpad! orany other intermediate device(other than a stylus! which is

optional for most moderntouchscreens.

Touchscreens are common indevices such as gameconsoles! all-in-onecomputers! tablet computers!and smartphones. They can

also be attached to computersor! as terminals! to networ"s.They also play a prominentrole in the design of digitalappliances such aspersonaldigital assistants(#$As! satellitenavigationdevices! mobilephones! and video games.

The popularity ofsmartphones! tablets! andmany types of informationappliancesis driving thedemand and acceptance of

http://en.wikipedia.org/wiki/Electronic_visual_displayhttp://en.wikipedia.org/wiki/Electronic_visual_displayhttp://en.wikipedia.org/wiki/Multi-touch_gestureshttp://en.wikipedia.org/wiki/Multi-touch_gestureshttp://en.wikipedia.org/wiki/Stylus_(computing)http://en.wikipedia.org/wiki/Multi-touch_gestureshttp://en.wikipedia.org/wiki/Mouse_(computing)http://en.wikipedia.org/wiki/Touchpadhttp://en.wikipedia.org/wiki/Game_consoleshttp://en.wikipedia.org/wiki/Game_consoleshttp://en.wikipedia.org/wiki/All-in-one_computerhttp://en.wikipedia.org/wiki/All-in-one_computerhttp://en.wikipedia.org/wiki/Tablet_computerhttp://en.wikipedia.org/wiki/Smartphonehttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Satellite_navigationhttp://en.wikipedia.org/wiki/Satellite_navigationhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/Video_gamehttp://en.wikipedia.org/wiki/Information_appliancehttp://en.wikipedia.org/wiki/Information_appliancehttp://en.wikipedia.org/wiki/Multi-touch_gestureshttp://en.wikipedia.org/wiki/Multi-touch_gestureshttp://en.wikipedia.org/wiki/Stylus_(computing)http://en.wikipedia.org/wiki/Multi-touch_gestureshttp://en.wikipedia.org/wiki/Mouse_(computing)http://en.wikipedia.org/wiki/Touchpadhttp://en.wikipedia.org/wiki/Game_consoleshttp://en.wikipedia.org/wiki/Game_consoleshttp://en.wikipedia.org/wiki/All-in-one_computerhttp://en.wikipedia.org/wiki/All-in-one_computerhttp://en.wikipedia.org/wiki/Tablet_computerhttp://en.wikipedia.org/wiki/Smartphonehttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Satellite_navigationhttp://en.wikipedia.org/wiki/Satellite_navigationhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/Video_gamehttp://en.wikipedia.org/wiki/Information_appliancehttp://en.wikipedia.org/wiki/Information_appliancehttp://en.wikipedia.org/wiki/Electronic_visual_displayhttp://en.wikipedia.org/wiki/Electronic_visual_display

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common touchscreens forportable and functionalelectronics. Touchscreens arepopular in the medical field

and in heavy industry! as wellas in "ios"s such as museumdisplays or room automation!where "eyboardand mousesystems do not allow a suitablyintuitive! rapid! or accurateinteraction by the user withthe display%s content.

&istorically! the touchscreensensor and its accompanyingcontroller-based firmwarehave been made available bya wide array of after-mar"et system integrators!and not by display! chip! ormotherboard manufacturers.

$isplay manufacturers andchip manufacturers worldwidehave ac"nowledged the trendtoward acceptance oftouchscreens as a highlydesirable userinterfacecomponent and havebegun to integrate

touchscreens into thefundamental design of theirproducts.

TYPES OF TOUCH

SCREENS

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RESISTIVE

TOUCHSCREEN

A resistivetouchscreen panelcomprises several layers! themost important of which aretwo thin! transparentelectrically-resistive layersseparated by a thin space.These layers face each otherwith a thin gap between. The

top screen (the screen that istouched has a coating on theunderside surface of thescreen. 5ust beneath it is asimilar resistive layer on top ofits substrate. ,ne layer has

http://en.wikipedia.org/wiki/Heavy_industryhttp://en.wikipedia.org/wiki/Room_automationhttp://en.wikipedia.org/wiki/Keyboard_(computing)http://en.wikipedia.org/wiki/Mouse_(computing)http://en.wikipedia.org/wiki/System_integratorhttp://en.wikipedia.org/wiki/User_interfacehttp://en.wikipedia.org/wiki/User_interfacehttp://en.wikipedia.org/wiki/Resistivehttp://en.wikipedia.org/wiki/Heavy_industryhttp://en.wikipedia.org/wiki/Room_automationhttp://en.wikipedia.org/wiki/Keyboard_(computing)http://en.wikipedia.org/wiki/Mouse_(computing)http://en.wikipedia.org/wiki/System_integratorhttp://en.wikipedia.org/wiki/User_interfacehttp://en.wikipedia.org/wiki/User_interfacehttp://en.wikipedia.org/wiki/Resistive

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conductive connections alongits sides! the other along topand bottom. A voltage isapplied to one layer! and

sensed by the other. 4hen anobject! such as a fingertip orstylus tip! presses down ontoouter surface! the two layerstouch to become connected atthat point6 The panel thenbehaves as a pair of voltagedividers! one axis at a time.

7y rapidly switching betweeneach layer! the position of apressure on the screen canbe read.

esistive touch is used inrestaurants! factories andhospitals due to its highresistance to li8uids and

contaminants. A major benefitof resistive touch technologyis its low cost. Additionally! asonly sufficient pressure isnecessary for the touch to besensed! they may be usedwithgloves on! or by usinganything rigid as a

finger9stylus substitute.$isadvantages include theneed to press down! and aris" of damage by sharpobjects. esistivetouchscreens also suffer from

poorer contrast! due to havingadditional reflections from theextra layer of material placedover the screen.:';