Touchscreen 1

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Transcript of Touchscreen 1

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    WHAT IS TO BE EXPLAINED..

    INTRODUCTION TO THEINTRODUCTION TO THE

    TECHNOLOGYTECHNOLOGY

    HOW IT WORKS ?HOW IT WORKS ?

    TOUCH SCREEN DIVERSITYTOUCH SCREEN DIVERSITY

    CONTROLERS USEDCONTROLERS USEDAPPLICATIONSAPPLICATIONS

    CLOSING THOUGHTSCLOSING THOUGHTS

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    HOW DOES A TOUCHSCREEN WORK?

    Main touch screen components:Main touch screen components:

    Touch sensor

    Controller

    Software driver

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    CONTROLLER

    The controller is a

    small PC card that

    connects between the

    touch sensor and the

    PC. It takes

    information from the

    touch sensor and

    translates it into

    information that PC

    can understand.

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    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.

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    TOUCH SCREEN DIVERSITY

    Resistive Touch screen

    Surface wave Touch screen

    Capacitive Touch screen*Surface capacitive

    *Projected capacitive

    Near Field Imaging Touch screen

    Infrared Touch screen

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    RESISTIVE TOUCH SCREEN

    1. Polyester Film .

    2. Top Resistive Layer.

    3. Conductive Transparent Metal Coating.4. Bottom Resistive Layer .

    5. Insulating Dots .

    6. Glass Substrate

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    Continued

    Resistive touch screen monitor is composed of a flexibletop 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.

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    VS20UA CONTROLLER

    Supply Voltage

    5.0V DC

    Maximum

    Current

    20mA (Pick)

    Resolution

    12-bit

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    SURFACE WAVE TECHNOLOGY

    It has a transmitting and receiving transducers for boththe X and Y axes.

    The touchscreen controller sends a 5 MHz electrical signal

    to the transmitting transducer, which converts the signalinto ultrasonic waves within the glass.

    These waves are directed across the front surface of thetouchscreen by an array of reflectors.

    Reflectors on the opposite side gather and direct thewaves to the receiving transducer, which reconverts theminto an electrical signala digital map of the touchscreen

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    Continued When you touch the screen, you absorb a portion of

    the wave traveling across it. The received signal is thencompared to the stored digital map, the changerecognized, and a coordinate calculated. . The digitizedcoordinates are transmitted to the computer forprocessing.

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    2701RSU CONTROLLER

    Voltaze

    +5 VDC

    Baud Rate

    9600 (default) and 19200

    Touch Resolution

    12bit, size independent

    Conversion Time

    10 ms per coordinate set

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    CAPACITIVE TOUCH SCREENS

    Surface Capacitive

    It has a an uniform conductive coating on a glasspanel.

    During operation, electrodes around the panel'sedge evenly distribute a low voltage across theconductive layer & creates an uniform electricfield.

    A finger touch draws current from each corner.

    Then the controller measures the ratio of thecurrent flow from the corners and calculates thetouch location

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    5000 RSU SERIAL CONTROLLER

    Supply Voltage :

    +5 V DC or +12V

    Baud Rate

    9600 (default) and 19200

    Touch Resolution

    12bit, size independent.

    Conversion Time

    Approximately 15 ms percoordinate set

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    Projected Capacitive

    Touch screen

    3layers:-front and

    back protective glass

    provides optical and

    strength enhancement

    options & middle

    layer consists of a

    laminated sensor grid

    of micro-fine wires

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    Continued During a touch,

    capacitance formsbetween thefinger and thesensor grid.

    The embeddedserial controller inthe touch screencalculates touch

    locationcoordinates andtransmits them tothe computer forprocessing.

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    APPLICATIONS..

    Public Information Displays:::Tourism displays, Trade show display

    Customer Self-Services:::Stores, Restaurants, ATMs, Airline ticketterminals and Transportation hubs.

    More uses...Digital jukeboxes, Computerized gaming, StudentRegistration systems, Multimedia softwares ,Scientific applications etc.

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    Pros & ConsDirect pointing to the

    objects.

    Fast

    Finger or pen is usable(No cable required)

    No keyboard necessary

    Suited to: novices,

    application forinformation retrievaletc

    Low precision by usingfinger

    User has to sit orstand closer to thescreen

    The screen may becovered more by usinghand

    No direct activation tothe selected function

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