1ab   Input Output Devices
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1ab Input Output Devices






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1ab   Input Output Devices 1ab Input Output Devices Presentation Transcript

  • Output Devices
  • Introduction
    • “ An output device is any hardware used to communicate processed data to the user, e.g. Monitor, speakers and printers.”
  • Printers
    • One of the most popular output devices
    • Inkjet printers
    • Laser printers
    • Graph plotters
    • Dot matrix printers
    • Thermal printers
    • Braille printers
  • Inkjet printers
    • Popular for domestic use
    • Small jets of ink sprayed on to paper
    • Three systems used for printing
      • Nozzles controlled by crystals which change shape
      • Ink heated and pushed through nozzles (bubblejet)
      • Continuous flow – ink squirts continuously from nozzles
  • Laser Printers
    • The most versatile – but are more expensive
    • Pages are set up in full before printing
    • They have four main parts:
      • Rotating drum – has an electrical charge
      • Laser – etches a negative electrically charged image onto the drum
      • Toner cartridge – drum attracts ink from toner cartridge to areas that are charged
      • Fuser unit – heats the paper, to make ink stick
  • What do you want from your printer?
    • Speed
      • Lasers fast – but modern inkjets can be just as fast
    • Resolution
      • Lasers offer best quality with highest dpi – but modern inkjets also offer very good quality
    • Initial Cost
      • Cost of colour lasers has reduced significantly – but inkets are still cheaper
    • Running Costs
      • Lasers are cheaper if you print out a lot of pages
  • Graph plotters
    • Often used with CAD
    • An arm moves over the paper, spraying ink
    • Designed to handle large sheets of paper
    • Output – high quality vector graphics
      • Good for architectural drawings
  • Dot matrix printers
    • Used a lot in the past – receipts
    • Print a series of dots that form characters
    • Useful if carbon copies are needed as they are impact printers
  • Thermal printers
    • Often used in calculators and fax machines
    • Marks transferred to paper, using heat
  • Braille printers
    • Also known as embossers
    • Create sequences of raised dots on the paper
  • Braille sensing
  • Monitors
    • Also known as VDUs (Visual Display Units)
    • Two main types :
      • CRT (Cathode Ray Tube)
      • Flatscreen – LCD – TFT - Plasma
  • LCD Projectors
    • This presentation is being output by a LCD projector.
    • Also known as beamers
  • Speakers
    • Add another dimension
    • Integral part of any multimedia system
    • Can be used as primary output – speech output for the visually impaired
  • Finally.....remember....
    • G.I.G.O.
      • Garbage
      • In
      • Garbage
      • Out