GENERALGENERALPRESENTATIONPRESENTATIONONONTOUCHSCREENTOUCHSCREENNeeraj DhimanNeeraj Dhiman
What is TouchscreenWhat is Touchscreen An input/output device that accept input directly from theAn input/output device t...
History of TouchscreenHistory of Touchscreen In 1971, the first "touch sensor" was developed by Doctor SamIn 1971, the fi...
How Does A Touchscreen worksHow Does A Touchscreen worksA basic Touchscreen has three main components:A basic Touchscreen ...
1. Touch Sensor1. Touch Sensor A touch screen sensor is a clear glassA touch screen sensor is a clear glasspanel with a t...
2. Controller2. Controller The controller is a small PC card thatThe controller is a small PC card thatconnects between t...
3. Software Driver3. Software Driver The driver is a software updateThe driver is a software updatefor the PC system that...
Touchscreen TechnologiesTouchscreen TechnologiesThere are basically three types of touch screenThere are basically three t...
Resistive Touchscreen TechnologyResistive Touchscreen Technology The Resistive system consists of a normalThe Resistive s...
Capacitive Touchscreen TechnologyCapacitive Touchscreen Technology The Capacitive, a layer that stores electricalThe Capa...
Surface Acoustic Wave TouchscreenSurface Acoustic Wave TouchscreenTechnologyTechnology A surface acustic wave technology,...
Comparing Touchscreen TechnologiesComparing Touchscreen Technologies 4-Wire Resistive Touch screens4-Wire Resistive Touch...
4-Wire Resistive Touch screens4-Wire Resistive Touch screens   4-Wire Resistive touch technology4-Wire Resistive touch te...
5-Wire Resistive Touchscreens5-Wire Resistive Touchscreens 5-Wire Resistive touch5-Wire Resistive touchtechnology consist...
Capacitive TouchscreensCapacitive Touchscreens   A capacitive touch screenA capacitive touch screenconsists of a glass pa...
PenTouch CapacitivePenTouch CapacitiveTouchscreensTouchscreens The PenTouch Capacitive screen is aThe PenTouch Capacitive...
THANKSTHANKSANY QUERYANY QUERY
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Transcript of "Touch screen"

  1. 1. GENERALGENERALPRESENTATIONPRESENTATIONONONTOUCHSCREENTOUCHSCREENNeeraj DhimanNeeraj Dhiman
  2. 2. What is TouchscreenWhat is Touchscreen An input/output device that accept input directly from theAn input/output device that accept input directly from themonitor , the user touches words, graphical icons, ormonitor , the user touches words, graphical icons, orsymbols displayed on screen to activate commands.symbols displayed on screen to activate commands. A touch screen is a computer display screen that is sensitiveA touch screen is a computer display screen that is sensitiveto human touch, allowing a user to interact with theto human touch, allowing a user to interact with thecomputer by touching pictures or words on the screen.computer by touching pictures or words on the screen.
  3. 3. History of TouchscreenHistory of Touchscreen In 1971, the first "touch sensor" was developed by Doctor SamIn 1971, the first "touch sensor" was developed by Doctor SamHurst (founder of Elographics) while he was an instructor atHurst (founder of Elographics) while he was an instructor atthe University of Kentucky. This sensor called the "Elograph"the University of Kentucky. This sensor called the "Elograph"was patented by The University of Kentucky Researchwas patented by The University of Kentucky ResearchFoundation.Foundation. In 1974, the first true touch screen incorporating a transparentIn 1974, the first true touch screen incorporating a transparentsurface came on the scene developed by Sam Hurst andsurface came on the scene developed by Sam Hurst andElographics. In 1977, Elographics developed and patentedElographics. In 1977, Elographics developed and patentedfive-wire resistive technology, the most popular touch screenfive-wire resistive technology, the most popular touch screentechnology in use today.technology in use today. On February 24, 1994, the company officially changed itsOn February 24, 1994, the company officially changed itsname from Elographics to Elo TouchSystems.name from Elographics to Elo TouchSystems.
  4. 4. How Does A Touchscreen worksHow Does A Touchscreen worksA basic Touchscreen has three main components:A basic Touchscreen has three main components: A Touch sensorA Touch sensor A ControllerA Controller A Software driverA Software driver..
  5. 5. 1. Touch Sensor1. Touch Sensor A touch screen sensor is a clear glassA touch screen sensor is a clear glasspanel with a touch responsive surface.panel with a touch responsive surface.The touch sensor/panel is placed over aThe touch sensor/panel is placed over adisplay screen so that the responsivedisplay screen so that the responsivearea of the panel covers the viewablearea of the panel covers the viewablearea of the video screen.area of the video screen. There are several different touch sensorThere are several different touch sensortechnologies on the market today, eachtechnologies on the market today, eachusing a different method to detect touchusing a different method to detect touchinput.input. The sensor generally has an electricalThe sensor generally has an electricalcurrent or signal going through it andcurrent or signal going through it andtouching the screen causes a voltage ortouching the screen causes a voltage orsignal change. This voltage change issignal change. This voltage change isused to determine the location of theused to determine the location of thetouch to the screen.touch to the screen.
  6. 6. 2. Controller2. Controller The controller is a small PC card thatThe controller is a small PC card thatconnects between the touch sensor and theconnects between the touch sensor and thePC. It takes information from the touchPC. It takes information from the touchsensor and translates it into informationsensor and translates it into informationthat PC can understand.that PC can understand. The controller is usually installed insideThe controller is usually installed insidethe monitor for integrated monitors or it isthe monitor for integrated monitors or it ishoused in a plastic case for external touchhoused in a plastic case for external touchadd-ons/overlays.add-ons/overlays. The controller determines what type ofThe controller determines what type ofinterface/connection you will need on theinterface/connection you will need on thePC. Specialized controllers are alsoPC. Specialized controllers are alsoavailable that work with DVD players andavailable that work with DVD players andother devices.other devices.
  7. 7. 3. Software Driver3. Software Driver The driver is a software updateThe driver is a software updatefor the PC system that allowsfor the PC system that allowsthe touchscreen and computerthe touchscreen and computerto work together. It tells theto work together. It tells thecomputers operating systemcomputers operating systemhow to interpret the touch eventhow to interpret the touch eventinformation that is sent frominformation that is sent fromthe controller.the controller. Most touch screen drivers todayMost touch screen drivers todayare a mouse-emulation typeare a mouse-emulation typedriver. This makes touching thedriver. This makes touching thescreen the same as clickingscreen the same as clickingyour mouse at the sameyour mouse at the samelocation on the screen.location on the screen.
  8. 8. Touchscreen TechnologiesTouchscreen TechnologiesThere are basically three types of touch screenThere are basically three types of touch screentechnologies:-technologies:- ResistiveResistive CapacitiveCapacitive Surface waveSurface wave
  9. 9. Resistive Touchscreen TechnologyResistive Touchscreen Technology The Resistive system consists of a normalThe Resistive system consists of a normalglass panel that is covered with aglass panel that is covered with aconductive and a resistive metallic layer.conductive and a resistive metallic layer.These two layers are held apart by spacers,These two layers are held apart by spacers,and a scratch-resistant layer is placed onand a scratch-resistant layer is placed ontop of the whole setup.top of the whole setup. An electrical current runs through the twoAn electrical current runs through the twolayers while the monitor is operational.layers while the monitor is operational.When a user touches the screen, the twoWhen a user touches the screen, the twolayers make contact in that exact spot.layers make contact in that exact spot. The change in the electrical field is notedThe change in the electrical field is notedand the coordinates of the point of contactand the coordinates of the point of contactare calculated by the computer. Once theare calculated by the computer. Once thecoordinates are known, a special drivercoordinates are known, a special drivertranslates the touch into something that thetranslates the touch into something that theoperating system can understand, much as aoperating system can understand, much as acomputer mouse driver translates a mousescomputer mouse driver translates a mousesmovements into a click or a drag.movements into a click or a drag.
  10. 10. Capacitive Touchscreen TechnologyCapacitive Touchscreen Technology The Capacitive, a layer that stores electricalThe Capacitive, a layer that stores electricalcharge is placed on the glass panel of thecharge is placed on the glass panel of themonitor. When a user touches the monitor withmonitor. When a user touches the monitor withhis or her finger, some of the charge ishis or her finger, some of the charge istransferred to the user, so the charge on thetransferred to the user, so the charge on thecapacitive layer decreases.capacitive layer decreases. This decrease is measured in circuit located atThis decrease is measured in circuit located ateach corner of the monitor. The computereach corner of the monitor. The computercalculates, from the relative differences in chargecalculates, from the relative differences in chargeat each corner, exactly where the touch eventat each corner, exactly where the touch eventtook place and then relays that information to thetook place and then relays that information to thetouch-screen driver software.touch-screen driver software. Advantage :-It transmits almost 90 percent ofAdvantage :-It transmits almost 90 percent ofthe light from the monitor, whereas the resistivethe light from the monitor, whereas the resistivesystem only transmits about 75 percent. Thissystem only transmits about 75 percent. Thisgives the capacitive system a much clearergives the capacitive system a much clearerpicture than the resistive system.picture than the resistive system.
  11. 11. Surface Acoustic Wave TouchscreenSurface Acoustic Wave TouchscreenTechnologyTechnology A surface acustic wave technology, two transducer (oneA surface acustic wave technology, two transducer (onereceiving and one sending) are placed along the x and y axes ofreceiving and one sending) are placed along the x and y axes ofthe monitors glass plate. Also placed on the glass are reflector --the monitors glass plate. Also placed on the glass are reflector --they reflect an electrical signal sent from one transducer to thethey reflect an electrical signal sent from one transducer to theother.other. The receiving transducer is able to tell if the wave has beenThe receiving transducer is able to tell if the wave has beendisturbed by a touch event at any instant, and can locate itdisturbed by a touch event at any instant, and can locate itaccordingly.accordingly. The wave setup has no metallic layers on the screen, allowing forThe wave setup has no metallic layers on the screen, allowing for100-percent light throughput and perfect image clarity. This100-percent light throughput and perfect image clarity. Thismakes the surface acoustic wave system best for displayingmakes the surface acoustic wave system best for displayingdetailed graphics (both other systems have significantdetailed graphics (both other systems have significantdegradation in clarity).degradation in clarity).
  12. 12. Comparing Touchscreen TechnologiesComparing Touchscreen Technologies 4-Wire Resistive Touch screens4-Wire Resistive Touch screens 5-Wire Resistive Touchscreens5-Wire Resistive Touchscreens Capacitive TouchscreensCapacitive Touchscreens PenTouch Capacitive TouchscreensPenTouch Capacitive Touchscreens
  13. 13. 4-Wire Resistive Touch screens4-Wire Resistive Touch screens   4-Wire Resistive touch technology4-Wire Resistive touch technologyconsists of a glass or acrylic panelconsists of a glass or acrylic panelthat is coated with electricallythat is coated with electricallycondictive and resistive layers.condictive and resistive layers. The thin layers are separated byThe thin layers are separated byinvisible separator dots. Wheninvisible separator dots. Whenoperating, an electrical currentoperating, an electrical currentmoves through the screen.moves through the screen. When pressure is applied to theWhen pressure is applied to thescreen the layers are pressedscreen the layers are pressedtogether, causing a change in thetogether, causing a change in theelectrical current and a touchelectrical current and a touchevent to be registered.event to be registered.
  14. 14. 5-Wire Resistive Touchscreens5-Wire Resistive Touchscreens 5-Wire Resistive touch5-Wire Resistive touchtechnology consists of a glass ortechnology consists of a glass oracrylic panel that is coated withacrylic panel that is coated withelectrically condictive andelectrically condictive andresistive layers.resistive layers. The thin layers are separated byThe thin layers are separated byinvisible separator dots. Wheninvisible separator dots. Whenoperating, an electrical currentoperating, an electrical currentmoves through the screen.moves through the screen. When pressure is applied to theWhen pressure is applied to thescreen the layers are pressedscreen the layers are pressedtogether, causing a change in thetogether, causing a change in theelectrical current and a touchelectrical current and a touchevent to be registered.event to be registered.
  15. 15. Capacitive TouchscreensCapacitive Touchscreens   A capacitive touch screenA capacitive touch screenconsists of a glass panel with aconsists of a glass panel with acapacitive (charge storing)capacitive (charge storing)material coating its surface.material coating its surface.Circuits located at corners of theCircuits located at corners of thescreen measure the capacitancescreen measure the capacitanceof a person touching the overlay.of a person touching the overlay. Frequency changes are measuredFrequency changes are measuredto determine the X and Yto determine the X and Ycoordinates of the touch event.coordinates of the touch event.
  16. 16. PenTouch CapacitivePenTouch CapacitiveTouchscreensTouchscreens The PenTouch Capacitive screen is aThe PenTouch Capacitive screen is adurable Capacitive type touchscreendurable Capacitive type touchscreenwith an attached pen stylus. Thewith an attached pen stylus. ThePenTouch screen can be set to respondPenTouch screen can be set to respondto finger input only, pen input only, orto finger input only, pen input only, orboth.both. A capacitive touch screen consists of aA capacitive touch screen consists of aglass panel with a capacitive (chargeglass panel with a capacitive (chargestoring) material coating its surface.storing) material coating its surface.Circuits located at corners of the screenCircuits located at corners of the screenmeasure the capacitance of a personmeasure the capacitance of a persontouching the overlay.touching the overlay. Frequency changes are measured toFrequency changes are measured todetermine the X and Y coordinates ofdetermine the X and Y coordinates ofthe touch event.the touch event.
  17. 17. THANKSTHANKSANY QUERYANY QUERY

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