Output, output devices, and media

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  • Created by: Andrew
  • Created on: 29-11-16 13:34
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  • Output
    • Visual output
      • Screens and monitors
        • CRT
          • Cathode ray tubes that fire electrons at a screen to make each pixel glow in the correct colour.
        • TFT
          • Thin film transistor - thinner than CRT. They use liquid crystals to form the image.
        • Large displays
          • Digital projectors
            • Used to project a large version of the monitor output onto a screen so that it can be viewed by a larger audience.
          • Interactive whiteboards
            • They have a touch-sensitive surface that can be 'written on' using a stylus shaped like a pen or a finger.
          • Plasma screens
            • Often used as TVs, but can be computer monitors. They work by illuminating tiny fluorescent lights to make the image.
        • Small displays
          • Mobile phone screens
            • Require a good quality image that refreshes quickly
          • PDAs
            • Larger screens than phones
    • Printers
      • Laser printers
        • Image is formed on the page using a laser beam on a light-sensitive drum that uses electrostatic charges to attract toner particles. A heating element then fuses the toner particles onto the page
        • Use CMYK toner colours. High quality documents, lower quality images.
      • Dot-matrix printers
        • The main use is to print on multipart stationary. Usually used when high-volume is needed and high-quality isn't important.
        • Use heated wires and heat-sensitive paper to produce text that is of fairly low quality and tends to fade over time.
      • Inkjet printers
        • Very popular for home use as they're cheaper than laser printers. However they're more expensive to run than laser printers and they generally are slower.
        • Higher quality images, lower quality documents.
        • They work by spraying colours onto a sheet of paper.
      • Multi-function printers
        • Include a built-in scanner and can be used as a photocopier.
        • Generally use inkjet technology rather than laser.
    • Speakers
      • Play sounds and music produced by the sound card.
      • Many monitors and laptops have built in speakers that play sound of relatively low quality suitable for general purpose use.

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