Rory pettitt 1433 computing presentation2

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Rory pettitt 1433 computing presentation2

  1. 1. Touch-Sensitive ScreenBy Rory Pettitt (Woo!)
  2. 2. What is a Touch-Sensitive Screen?I will be going over Multi-Touch, rather thanMono-Touch.A Multi-Touch screen allows people to controlinformation with their fingertips (Or other bodyparts)It accomplishes this via Mutal Capacitance, thisrequires two layers of material. One carriescurrent and the other sensing lines.
  3. 3. How touch sensingworks:1) The screen register touch. (2) Raw data iscaptured. (3) Background noise is removed. (4)Pressure Points are measured. (5) Touch areasare established. (6) Exact coordinates arecalculated.
  4. 4. ContinuedFor a MTS to interpret the raw data it has to gothrough seveal steps:(1) Signals travel from the touch sreen to theprocessor as electrical impulses. (2) The processorthen uses a piece of software to analyze the data todeterming the feature of each touch: Including size,shape and location (If Necessary). (3) The processoruses gesture-interpretation software to determinewhich gesture the person made. (4) The processorrelays you instruction to the program in use.
  5. 5. The Mutual CapacitanceScreenThe MCS is made of several layers, in order:LCD Display Layers, Glass Substrate, SensingLines, Driving Lines, Bonding Layer, protectivecover and anti-Reflective Coating.
  6. 6. Driving/Sensing LinesThe circuitry can sense changes at each pointalong the grid. This grid is the combination ofDriving/Sensing lines, Vertical and Horizontalrespectively.Every point on the grid generates its own signalwhen touched, when then relays the signalgenerated to the processor.

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