There are different types of touch screen sensors including external add-on touch screens and integrated touch screens. Touch screens work by using a clear sensor over the display and detecting disturbances in electric fields or ultrasonic waves when the screen is touched. Common applications include credit card scanners, consumer electronics, ATMs, and kiosks. Touch screens can cost between $169-$4872 depending on size and features. They are available from various online retailers.

1. Thomas Shupe ECE 5320 Mechatronics Assignment #1

2. Outline What are touch screen sensors? Different types touch screen sensors Working principles Major applications Cost Where to buy References

3. DEFINITION What are Touch Screens?

4. Touch Screen Sensors “ 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.”

5. Types of Touch Screen Sensors External add on touch screens Integrated Touch Screen Monitors

6. External Add On Touch Screen Sensor Can be added to your home computer Brings touch screen technology to the common user

7. Integrated Touch Screens The sensor system is already integrated into the screen or monitor

8. Working Principles A clear touch sensor is placed over the viewable video screen

9. Working Principles A controller (2) takes information from the touch screen (1) The info is turned into information the computer can understand A software driver is needed to allow the touch screen and computer to work together (3)

10. Working Principles Multiple Types of Touch Sensors Resistive Surface Acoustic Wave Capacitive Infrared Strain Gage

11. Resistive Composed of several layer including two metallic layers separated from each other When metallic layers are connected (touched) they act as like 2 voltage dividers Change in electric current is sent to controller and the location is determined

12. Surface Acoustic Wave Uses Ultrasonic waves across the surface When the screen is touched part of the wave is absorbed This allows the controller to determine the position of the touch

13. Capacitive Coated with a current conducting material Sensor has a precisely controlled field of stored electrons in horizontal and vertical directions Humans also exhibit capacititance A controller detects when there is a disturbance in the electric field (touch) The controller then determines the location

14. Infrared An array of infrared sensors are placed horizontally and vertically The sensors send out pulses of light The sensors detect the interruption of the light The location is then determined by the controller

15. Strain Gage Screen is mounted on four springs one at each corner Deflection of screen when touched is measured by all four strain gages Calculations are made based on each of the four deflections to determine the location of the touch

16. Typical Applications Credit Card Scanners

17. Typical Applications Consumer Electronics Phones PDA’s Digital Cameras GPS etc

18. Typical Applications ATM Interactive Kiosks and learning stations Etc.

19. Cost Overlay screen $169 - $299 Integrated Touch Screen Monitor 12” LCD $609 17” Monitor $539 42” LCD $4872

20. Where To Buy www.touchscreens.com http://www.ezscreen.com/ http://www.abilityhub.com/mouse/touchscreen.htm

21. References http://en.wikipedia.org/wiki/Touchscreen http://www.touchscreens.com/intro-anatomy.html Research Note on Touch Screen Sensors by Andrew Nathanson http://www.wisegeek.com/what-are-touch-screen-monitors.htm

22. THANK YOU