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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