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ASRB NET Extension Education
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    Touch Screens

    Meaning; A touch screen is an input/output device that allows the user to interact directly with a computer or device by touching the display screen using a finger, stylus, or special pen.

    Types of Touch Screen Technologies

    1. Resistive Touch Screen → Works by pressure; affordable but less sensitive.
    2. Capacitive Touch Screen → Uses electrical signals; highly responsive (used in smartphones).
    3. Infrared Touch Screen → Uses light beams; durable and highly accurate.
    4. Surface Acoustic Wave (SAW) → Uses sound waves; highly sensitive but expensive.

     

    Facts about Touch Screens

    • First touch screen → Developed by A. Johnson in 1965 (UK).
    • Widely used in ATMs, smartphones, POS machines, education kiosks, and agriculture extension services.
    • By 2025, almost 90% of mobile devices worldwide will use capacitive touchscreens.

     

     

    Micro-Computers

    Meaning

    • A micro-computer is a small, relatively inexpensive computer with a microprocessor as its central processing unit (CPU).
    • They are designed for individual use and are commonly known as personal computers (PCs).

    Types of Micro-Computers

    1. Desktop Computers → Fixed location, powerful, widely used in offices, labs, and universities.
    2. Laptop / Notebook Computers → Portable, battery-operated, used by students, researchers, and extension workers.
    3. Tablet Computers → Lightweight with touch screen interface.
    4. Smartphones → Advanced micro-computers used for internet, apps, ICT in agriculture.

    Facts about Micro-Computers

    • The first micro-computer (Altair 8800) was released in 1975 by Micro Instrumentation and Telemetry Systems (MITS).
    • IBM introduced its first Personal Computer (IBM PC) in 1981, making micro-computers popular worldwide.
    • Today’s smartphones are more powerful than the Apollo 11 computer that landed humans on the moon in 1969.

     

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