Touch screen


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Touch screen

  1. 1. Touch Screen Sensors <ul><li>Thomas Shupe </li></ul><ul><li>ECE 5320 Mechatronics </li></ul><ul><li>Assignment #1 </li></ul>
  2. 2. Outline <ul><li>References </li></ul><ul><li>To explore further </li></ul><ul><li>What are touch screen sensors </li></ul><ul><li>Different types touch screen sensors </li></ul><ul><li>Working principles </li></ul><ul><li>Major applications </li></ul><ul><li>Cost </li></ul><ul><li>Where to buy </li></ul>
  3. 3. References <ul><li> </li></ul><ul><li> </li></ul><ul><li>Research Note on Touch Screen Sensors by Andrew Nathanson </li></ul><ul><li> </li></ul>
  4. 4. To Explore Further <ul><li>,,sid183_gci214510,00.html </li></ul><ul><li> </li></ul><ul><li>Multi-Touch Interaction Research </li></ul><ul><li>by Jeff han </li></ul>
  5. 5. What are Touch Screen Sensors? <ul><li>“ A Touchscreen is a display which can detect the location of touches within the display area. This allows the display to be used as an input device, removing the keyboard and/or the mouse as the primary input device for interacting with the display's content.” </li></ul><ul><li> </li></ul>
  6. 6. Types of Touch Screen Sensors <ul><li>External add on touch screens </li></ul><ul><li>Integrated Touch Screen Monitors </li></ul>
  7. 7. External Add On Touch Screen Sensor <ul><li>Can be added to your home computer </li></ul><ul><li>Brings touch screen technology to the common user </li></ul>
  8. 8. Integrated Touch Screens <ul><li>The sensor system is already integrated into the screen or monitor </li></ul>
  9. 9. Working Principles <ul><li>A clear touch sensor is placed over the viewable video screen </li></ul>
  10. 10. Working Principles <ul><li>A controller (2) takes information from the touch screen (1) </li></ul><ul><li>The info is turned into information the computer can understand </li></ul><ul><li>A software driver is needed to allow the touch screen and computer to work together (3) </li></ul>
  11. 11. Working Principles Multiple Types of Touch Sensors <ul><li>Resistive </li></ul><ul><li>Surface Acoustic Wave </li></ul><ul><li>Capacitive </li></ul><ul><li>Infrared </li></ul><ul><li>Strain Gage </li></ul>
  12. 12. Resistive <ul><li>Composed of several layer including two metallic layers separated from each other </li></ul><ul><li>When metallic layers are connected (touched) they act as like 2 voltage dividers </li></ul><ul><li>Change in electric current is sent to controller and the location is determined </li></ul>
  13. 13. Surface Acoustic Wave <ul><li>Uses Ultrasonic waves across the surface </li></ul><ul><li>When the screen is touched part of the wave is absorbed </li></ul><ul><li>This allows the controller to determine the position of the touch </li></ul>
  14. 14. Capacitive <ul><li>Coated with a current </li></ul><ul><li>conducting material </li></ul><ul><li>Sensor has a precisely controlled field of stored electrons in horizontal and vertical directions </li></ul><ul><li>Humans also exhibit capacititance </li></ul><ul><li>A controller detects when there is a disturbance in the electric field (touch) </li></ul><ul><li>The controller then determines the location </li></ul>
  15. 15. Infrared <ul><li>An array of infrared sensors are placed horizontally and vertically </li></ul><ul><li>The sensors send out pulses of light </li></ul><ul><li>The sensors detect the interruption of the light </li></ul><ul><li>The location is then determined by the controller </li></ul>
  16. 16. Strain Gage <ul><li>Screen is mounted on four springs one at each corner </li></ul><ul><li>Deflection of screen when touched is measured by all four strain gages </li></ul><ul><li>Calculations are made based on each of the four deflections to determine the location of the touch </li></ul>
  17. 17. Typical Applications <ul><li>Credit Card Scanners </li></ul>
  18. 18. Typical Applications <ul><li>Consumer Electronics </li></ul><ul><li>Phones </li></ul><ul><li>PDA’s </li></ul><ul><li>Digital Cameras </li></ul><ul><li>GPS </li></ul><ul><li>etc </li></ul>
  19. 19. Typical Applications <ul><li>ATM </li></ul> Interactive Kiosks and learning stations Etc. Etc. Etc.
  20. 20. Cost <ul><li>Overlay screen $169 - $299 </li></ul><ul><li>Integrated Touch Screen Monitor </li></ul><ul><ul><li>12” LCD $609 </li></ul></ul><ul><ul><li>17” Monitor $539 </li></ul></ul><ul><ul><li>42” LCD $4872 </li></ul></ul>
  21. 21. Where To Buy <ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>