Understanding Capacitive Touch Screens

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Understanding Capacitive Touch Screens Since Apple released the first generation iPhone on June 29, 2007(Honan, Mathew, "Apple unveils iPhone", 2007), the way of using handphone started to change .The biggest change is a handphone could control a big touch screen without using a pen on it. Touch screen interfaces are effective in many other appliances as well, like tablets, laptop and TVs which influences the technological researches in recent 5-6 years. The objective of this essay is to briefly explain the principals involved in the working of capacitive touch technology .The main focus will be on the basics of what is contained inside a capacitive touch screen and what the features are and, how capacitive touch screens work. Image from Sony Mobile A capacitive touch screen consist a first plurality of conductive traces formed on a first glass surface; a plurality of capacitive sense lines between the first plurality of conductive traces; an optically matched insulating layer of silicone dioxide formed over the first plurality of conductive traces with a plurality of openings that expose ends of the plurality of capacitive sense lines; and a conductive layer over the insulating layer that connects to the ends of the plurality of capacitive sense lines through the plurality of openings. (L Mozdzyn - US Patent App. 12/210,140, 2008) All the layers above is called Projected capacitive touch (PCT) technology, which is a capacitive touch-sensing technology allows more accurate and flexible operation, by etching the conductive layer. (Capacitive Touch (Touch Sensing Technologies — Part 2)". TouchAdvance.com) However, Projected capacitive touch (PCT) technology comes in two different types: self-capacitance, and mut... ... middle of paper ... ... – Web.21 May 2014. < http://www.google.com/patents/US20100066700 > "Floating touch." Developer World Floating touch Comments. Sony Mobile, n.d. Retrieved Web. 21 May 2014. . "Capacitive Touch (Touch Sensing Technologies — Part 2)". TouchAdvance.com. Retrieved 21 May 2014. < http://www.touchadvance.com/2011/06/capacitive-touch-touch-sensing.html> L. K. Baxter, Capacitive Sensors: Design and Applications (Wiley-IEEE, 1996). Retrieved 21 May 2014. < http://books.google.co.uk/books?id=Tjd2laRnO4wC&pg=PA156&lpg=PA156&dq=L.+K.+Baxter,+Capacitive+Sensors:+Design+and+Applications&source=bl&ots=NwUVthxIZ_&sig=8w0pnPMoygYiw0HkLs0iSb4uFKk&hl=en&sa=X&ei=kUJ9U5mDOoPA7Aa1xoCgCw&ved=0CEEQ6AEwAQ#v=onepage&q=L.%20K.%20Baxter%2C%20Capacitive%20Sensors%3A%20Design%20and%20Applications&f=false>

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