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  • Created by: luiop100
  • Created on: 14-03-16 11:51


Information types:

  • visual

  • audible

Output Devices

Visual Output:

  • Most computer information is viewed on a monitor

  • Screens and monitors:

    • Allow the user to see what’s happening

    • Allow to see a moving image, unlike the static one produced by a printer

    • Image quality depends on its resolution

    • Complex graphics require a high resolution

    • The resolution of a display is measured in pixels

    • CRT monitor - based on cathode ray tubes, a bulkier computer, create a sharp and clear display at a low cost

    • TFT monitor - thin film transistor, takes up less room than a CRT

  • Large displays:

    • When computer produced images need to be shown to large amounts of people

    • Digital Projector, used to project a larger version of what’s on a computer screen, can be portable or mounted

    • Interactive whiteboard, projectors can be used to project images onto them, can be “written on” using a stylus of some form, often used in classrooms, both input and output devices

    • Plasma screen, often used as TVs but can also be used as computer monitors, work by illuminating tiny fluorescent lights to create an image, can be used to create large wall mounted displays

  • Small displays

    • Mobile phone screens, have access to the internet and require a high quality screen capable of refreshing, the small screen size can be difficult to program for, be able to watch tv programs

    • PDAs, larger screen than mobile phones, need to run more complex software, have touch screens and have to run a virtual keyboard

  • Printers

    • Laser printer, print a full page at a time like a photocopier, very popular in offices where they require high quality documents, produce clear text and diagrams

    • Inkjet printer, very popular especially in the home, cheaper than lasers, use tri-coloured ink, can print on


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