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Touch Screen - by Suma
 

Touch Screen - by Suma

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

    • 1
      TOUCH SCREEN
      Presented by
      SUMA.M.A
      B.Sc(4th SEM)Emcs
      1
    • WHAT IS TO BE EXPLAINED...
      • INTRODUCTION TO THE TECHNOLOGY
      • HOW IT WORKS ?
      • TOUCH SCREEN DIVERSITY
      • CONTROLERS USED
      • APPLICATIONS
      • PROS n CONS
      • CONCLUSION
      2
    • 3
      INTRODUCINGTHETECHNOLOGY
      • A touch screen is an Electronic visual display.
      • The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it.
      • The first touch sensor was developed by “Doctor Sam Hurst” in 1971.
      • The HP-150 from 1983 was probably the world’s earliest commercial touchscreen computer.
    • 4
      HOWDOESATOUCHSCREENWORK?
      Main touch screen components:
      • Touch sensor
      • Controller
      • 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.
    • 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.
      • 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
    • Most Common types Of Touchscreen Technology
      1. Resistive
      2. Surface acoustic wave
      3. Capacitive
      4. Dispersive signal technology
      5. Acoustic pulse recognition
      9
    • 10
      RESISTIVE
      Polyester Film .
      Top Resistive Layer.
      Conductive Transparent Metal Coating.
      Bottom Resistive Layer .
      Insulating Dots .
      Glass Substrate
    • 11
      Polyester film
      CTMC
      Top resistive layer
      Bottom
      resistive
      layer
      Insulating
      dots
      Glass
      substrate
    • 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.
      • The inside surface of each of the two layers is coated with a transparent metal oxide coating
      • Pressing the flexible top sheet creates electrical contact between the resistive layers, producing a switch closing in the circuit.
      • 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
    • 14
      CAPACITIVE
      • It has a an uniform conductive coating on a glass panel.
      • During operation, electrodes around the panel's edge evenly distribute a low voltage across the conductive layer & creates an uniform electric field.
      • A finger touch draws current from each corner.
      • Then the controller measures the ratio of the current flow from the corners and calculates the touch location
    • 15
      • Toughbook series by Panasonic
      • ST series Stylistic tablets from Fujitsu
      • P series and T series notebooks from Fujitsu
      • C1 series notebook from LG
      • Latitude XT series by Dell
      • TouchSmart PCs from HP (really an All-in-One PC )
      16
      Most popular Usage
    • 17
      APPLICATIONS..
      • Public Information Displays:
      Tourism displays, Trade show display
      • Customer Self-Services: Stores, Restaurants, ATMs, Airline ticket terminals and Transportation hubs.
      • More uses... Digital jukeboxes, Computerized gaming, Student Registration systems, Multimedia software‘s, Scientific applications etc.
    • 18
      ProsCons
      • Direct pointing to the objects.
      • Fast
      • Finger or pen is usable (No cable required)
      • No keyboard necessary
      • Suited to: novices, application for information retrieval etc.
      • Low precision by using finger.
      • Bit Expensive.
      • User has to sit or stand closer to the screen
      • Power Consumption.
      • 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.
    • THANK
      YOU