A touch screen is anelectronic visual displaythat can detect thepresence and location of atouch within the displayarea. Touch screen can alsosense other passive objectssuch as stylus.
The first touch screenwas a capacitivetouch screendeveloped by E.A.Johnson at the RoyalRadar Establishment,Malvern, UK in 1965.
A basic touch screenhas three maincomponents : Touch sensor Controller Software driver
A touch screen sensor is aclear glass panel with atouch response area. The touch sensor is placedover a display screen sothat the responsive areaof the panel covers theviewable area of thescreen.
The controller connect between the touch sensor andthe PC. Take information from the touch sensor and translateit into information that PC can understand.
The driver allow the touch screen and computer towork together This makes touching the screen as same as clickingthe your mouse at the same location on the screen.
Composed of severallayers Two Electricallyconductive layersseparated by anarrow gap. Resistive touch isused in restaurants,factories andhospitals due to itshigh resistance toliquids andcontaminants.
uses ultrasonic wavesthat passes over thetouch screen panel. This change in theultrasonic wavesregisters the position ofthe touch event andsends this informationto the controller forprocessing.
Consist of an insulatorsuch as glass , coatedwith transparentconductor such as ITO(Indium Tin Oxide) touching the surface ofthe screen results in adistortion of thescreenselectrostatic field,measurable as a changein capacitance. one requires a specialcapacitive stylus
An infrared touch screenuses an array of X-Yinfrared LED and photodetector pairs around theedges of the screen todetect a disruption in thepattern of LED beams. These LED beams crosseach other in vertical andhorizontal patterns. Thishelps the sensors pick upthe exact location of thetouch.
In this two or moreimage sensors areplaced around theedges of the screen.A touch shows up asa shadow and eachpair of cameras canthen be pinpointed tolocate the touch.
User friendly Fast response Error free input Use finger , fingernail , glovedhands , stylus or any soft tippointer Easy to clean Does not interfere mouse andkeyboard Make computing easy , powerfuland fun It benefits children
Finger stress Fingerprints screen has to be really big not to missthings when pressing them with your finger big screen leads to low battery life touch screen means screen can’t be read too well indirect sunlight as it applies an additional not 100%transparent Fatigue
Designers are trying to use touch screen to simplifyinput commands Today , touch screen has becomes adopted bycomputers users of all abilities because it is simple,fast and innovative. In future there is no usage of mouse and keyboardsas they will be replaced by touch screen.