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Output Devices
Introduction <ul><li>“ An output device is any hardware used to communicate processed data to the user, e.g. Monitor, spea...
Printers <ul><li>One of the most popular output devices </li></ul><ul><li>Inkjet printers </li></ul><ul><li>Laser printers...
Inkjet printers <ul><li>Popular for domestic use </li></ul><ul><li>Small jets of ink sprayed on to paper </li></ul><ul><li...
Laser Printers <ul><li>The most versatile – but are more expensive </li></ul><ul><li>Pages are set up in full before print...
 
What do you want from your printer? <ul><li>Speed </li></ul><ul><ul><li>Lasers fast – but modern inkjets can be just as fa...
 
Graph plotters <ul><li>Often used with CAD </li></ul><ul><li>An arm moves over the paper, spraying ink </li></ul><ul><li>D...
Dot matrix printers <ul><li>Used a lot in the past – receipts </li></ul><ul><li>Print a series of dots that form character...
Thermal printers <ul><li>Often used in calculators and fax machines </li></ul><ul><li>Marks transferred to paper, using he...
Braille printers <ul><li>Also known as embossers </li></ul><ul><li>Create sequences of raised dots on the paper </li></ul>
Braille sensing
Monitors <ul><li>Also known as VDUs (Visual Display Units) </li></ul><ul><li>Two main types :  </li></ul><ul><ul><li>CRT (...
LCD Projectors <ul><li>This presentation is being output by a LCD projector. </li></ul><ul><li>Also known as beamers </li>...
Speakers <ul><li>Add another dimension </li></ul><ul><li>Integral part of any multimedia system </li></ul><ul><li>Can be u...
Finally.....remember.... <ul><li>G.I.G.O. </li></ul><ul><ul><li>Garbage </li></ul></ul><ul><ul><li>In </li></ul></ul><ul><...
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1ab Input Output Devices

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Transcript of "1ab Input Output Devices"

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