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How do touch screens accurately detect heat?

How do touch screens accurately detect heat?. By Jacob D. and Nathan S. Well first. We found out touch screens don't detect heat, they detect either force, electric current, or acoustic waves. The Resistive System.

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How do touch screens accurately detect heat?

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  1. How do touch screens accurately detect heat? • By Jacob D. and Nathan S.

  2. Well first • We found out touch screens don't detect heat, they detect either force, electric current, or acoustic waves.

  3. The Resistive System • The resistive system works by creating a electrical current in two conductive layers and when these touch they create a short out causing a drop in electrical current allowing the operating system mark where the screen was touched.

  4. Whats it made of? • The resistive system is made of a flexible plastic screen, a conductive film (Normally Indium Tin Oxide(ITO)) a air gap created by nonconductive spacers (Made from materials such as rubber) and a sheet opposite the screen made from a film of ITO and glass as a insulater

  5. What is ITO and Why is it a main component in Resistive System touch screens? • ITO is a transparent conductor that allows for touchscreen devices to be a viewable screen. • ITO is created when approximately 90% Indium Oxide (In2O3) and 10% Tin Oxide (SnO2) are combined (by weight) • In powder form ITO is yellow-green in color, but in a thin film it becomes transparent and usable for touch screens.

  6. The Capacitive System • The capacitive system works by having a layer storing a electrical charge on a glass panel that works as the monitor. The operating system detects where the screen is touched by detecting where there was a drop of electricity on the screen as some of the charge is conducted my a finger touching the screen

  7. Well how is the electrical drops position on the charged layer calculated? • Well the drop of charge on the charged layer of a Capacitive system touchscreen is measured in the drop of electricity in circuits in each corner of the screen, then by calculating a ratio of the drops from each corner it can accurately find the coordinates of where the screen was touched.

  8. What materials go into a Capacitive System touch screen • For the most part the Capacitive System layout is the same as the Resistive system except for 1 major part • This part is the actual screen that your finger comes in contact with is glass, not allowing it to bend or flex.

  9. Pros And Cons of Resistive Pros Cons 25% Of Light Doesn’t Brighten the Screen Cheep Less Likely to Break Pocket Dialing Common Plastic Styluses Work Well

  10. Pros and Cons of Capacitive Pros Cons 90% Light Brightens Screen Breaks Easily Styluses must be better Conductors of Electricity Reduces Chance Of Pocket Dialing

  11. Bibliography • "Resistive vs Capacitive Touchscreen | Tech Explainer." Tech Explainer. N.p., n.d. Web. 25 Mar. 2013. • "Indium Tin Oxide (ITO) (In2O3):(SnO2)." Indium Corporation Blog. N.p., n.d. Web. 25 Mar. 2013. • "Gdgt." Gdgt. N.p., n.d. Web. 25 Mar. 2013. • "DMC - Touch Screen Manufacturer. [Standard Surface Capacitive Touch Screen]."DMC - Touch Screen Manufacturer. [Standard Surface Capacitive Touch Screen]. N.p., n.d. Web. 25 Mar. 2013. • "Are We Running out of Touchscreens?" TechRadar. N.p., n.d. Web. 25 Mar. 2013. • "Apple Releases Two New Ads for IPad." Ahitagni RSS. N.p., n.d. Web. 25 Mar. 2013.

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