Touch Screen - by Suma
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Touch Screen - by Suma Presentation Transcript

  • 1. 1
    TOUCH SCREEN
    Presented by
    SUMA.M.A
    B.Sc(4th SEM)Emcs
    1
  • 2. WHAT IS TO BE EXPLAINED...
    • INTRODUCTION TO THE TECHNOLOGY
    • 3. HOW IT WORKS ?
    • 4. TOUCH SCREEN DIVERSITY
    • 5. CONTROLERS USED
    • 6. APPLICATIONS
    • 7. PROS n CONS
    • 8. CONCLUSION
    2
  • 9. 3
    INTRODUCINGTHETECHNOLOGY
    • A touch screen is an Electronic visual display.
    • 10. The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it.
    • 11. The first touch sensor was developed by “Doctor Sam Hurst” in 1971.
    • 12. The HP-150 from 1983 was probably the world’s earliest commercial touchscreen computer.
  • 4
    HOWDOESATOUCHSCREENWORK?
    Main touch screen components:
    • Touch sensor
    • 13. Controller
    • 14. Software driver
  • 5
    TOUCHSENSOR
    • A touch screen sensor is a clear glass panel with a touch responsive surface which is placed over a display screen so that the responsive area of the panel covers the viewable area of the display screen.
  • 6
    CONTROLLER
    The controller is a small PC card.
    It processes the received signals and sends data to the processor.
  • 15. 7
    SOFTWARE DRIVER
    • The driver is a software that allows the touch screen and computer to work together. It tells the operating system how to interpret the touch event information that is sent from the controller.
    • 16. Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen the same as clicking your mouse at the same location on the screen.
  • 8
  • 17. Most Common types Of Touchscreen Technology
    1. Resistive
    2. Surface acoustic wave
    3. Capacitive
    4. Dispersive signal technology
    5. Acoustic pulse recognition
    9
  • 18. 10
    RESISTIVE
    Polyester Film .
    Top Resistive Layer.
    Conductive Transparent Metal Coating.
    Bottom Resistive Layer .
    Insulating Dots .
    Glass Substrate
  • 19. 11
    Polyester film
    CTMC
    Top resistive layer
    Bottom
    resistive
    layer
    Insulating
    dots
    Glass
    substrate
  • 20. 12
    Continued…
    • Resistive touch screen monitor is composed of a flexible top layer and a rigid bottom layer separated by insulating dots, attached to a touch screen controller.
    • 21. The inside surface of each of the two layers is coated with a transparent metal oxide coating
    • 22. Pressing the flexible top sheet creates electrical contact between the resistive layers, producing a switch closing in the circuit.
    • 23. The controller gets the alternating voltages between the two layers and converts them into the digital X and Y coordinates of the activated area.
  • 13
    VS20UA CONTROLLER
    • Supply Voltage
    5.0V  DC
    • Resolution
    12-bit
  • 24. 14
    CAPACITIVE
    • It has a an uniform conductive coating on a glass panel.
    • 25. During operation, electrodes around the panel's edge evenly distribute a low voltage across the conductive layer & creates an uniform electric field.
    • 26. A finger touch draws current from each corner.
    • 27. Then the controller measures the ratio of the current flow from the corners and calculates the touch location
  • 15
  • 28.
    • Toughbook series by Panasonic
    • 29. ST series Stylistic tablets from Fujitsu
    • 30. P series and T series notebooks from Fujitsu
    • 31. C1 series notebook from LG
    • 32. Latitude XT series by Dell
    • 33. TouchSmart PCs from HP (really an All-in-One PC )
    16
    Most popular Usage
  • 34. 17
    APPLICATIONS..
    • Public Information Displays:
    Tourism displays, Trade show display
    • Customer Self-Services: Stores, Restaurants, ATMs, Airline ticket terminals and Transportation hubs.
    • 35. More uses... Digital jukeboxes, Computerized gaming, Student Registration systems, Multimedia software‘s, Scientific applications etc.
  • 18
    ProsCons
    • Direct pointing to the objects.
    • 36. Fast
    • 37. Finger or pen is usable (No cable required)
    • 38. No keyboard necessary
    • 39. Suited to: novices, application for information retrieval etc.
    • 40. Low precision by using finger.
    • 41. Bit Expensive.
    • 42. User has to sit or stand closer to the screen
    • 43. Power Consumption.
    • 44. Screen gets dirty often.
  • 19
    CONCLUSION
    Though the touch screen technology contains some limitations it’s very user friendly, fast, accurate, easy for the novices & fun to operate. It has been widely accepted. And now by just modifying a little it can replace the mouse and key board completely in near future.
  • 45. THANK
    YOU