Output Device


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Output Device

  1. 1. Output devices<br />
  2. 2. Introduction<br />In this presentation we will talk about Output device.<br />Output device are very useful.<br />For example monitor, printer and speakers.<br />
  3. 3. Monitors<br />Picture on monitor are made out of thousands of colour dots called pixels.<br />Higher the pixel higher the quality.<br />There are two type of monitor<br />Cathode ray tube (CRT)<br />Thin film Transistor (TFT)<br />
  4. 4. Cathode ray tube <br />CRT are outdated <br />Large and bulky<br />Glass screen <br />Produce a lot of heat<br />Noisy compare to TFT<br />
  5. 5. Thin film transistor<br />Replacement of OCR<br />Nicer and take up less space<br />They are quieter than CRT<br />Easily to damage<br />The colour and contrast are not so good as a CRT. Unless you have a very high quality one.<br />The picture can look a bit dull.<br />
  6. 6. Printers<br />They are use to create a hard copy of your work.<br />Most printer produce work on paper.<br />There are 4 type of printer<br />Laser printers<br />Ink-jet printers<br />Dot-matrix printers<br />Plotters<br />
  7. 7. Laser printer<br />Quiet<br />Print large number of sheets very quickly and they produce high quality documents.<br />Used powdered ink called toner<br />Cost per page is low<br />Most expensive printer to buy<br />Toner are more expensive than ink-jet cartidges.<br />Larger than ink-jet<br />Can’t create carbon copies like the dot-matrix.<br />
  8. 8. Ink jet Printers<br />Cheap to buy<br />Can combine both black and white and colour printing at the same time<br />Use cartridges which contain ink<br />Useful for few document needed and the quality of the printout doesn’t need to be perfect.<br />They are more compact than laser<br />Cartridges cost less to replace than toners.<br />Better quality than dot-matrix<br />Slower than laser<br />Noiser than laser<br />Cartridges need to be replace more often than laser<br />Cartridges can dry out<br />
  9. 9. Dot-matrix <br />Impact printer<br />Different combination of pins are pushed out to form different characters.<br />Very noisy<br />It is useful when you need carbon copies like bills.<br />Cheap to buy<br />Low operating cost<br />Can print continuously <br />Create carbon copies<br />Poor quality <br />Very slow to print<br />Noisy<br />Cannot produce colour copies.<br />
  10. 10. Plotters<br />Specialist type of printer which able to draw high quality image over a very large piece of paper.<br />Used by engineers, architects and map-makers.<br />A plotters uses pen to draw images.<br />There are now pen-less plotters.<br />Drawing are the same quality as the expert.<br />Larger sizes of paper can be used than most printers<br />Slower than other printer<br />More expensive than printer<br />Do not produce high quality text printout.<br />There are 3 different type of plotters<br />Flatbed-hold the paper still while the pen move<br />Drum plotters- these roll paper over the cylinder<br /> Pinch-rollers plotters- these are a mixture of the two type above.<br />
  11. 11. Speakers<br />Most computer fit a small internal speakers which will produce a beeping sound when you made an error.<br />Everyone in the room can hear output from computer.<br />Help to create atmosphere<br />Help blind people to use computer<br />The sound can disturb other people while they are trying to do their work.<br />High quality speakers can be expensive<br />
  12. 12. Lights (LEDs)<br />Light can be connect to computer and respond to the signal which tell them to switch on or off<br />Used in a computer to help to show that it is working correctly<br />Can provide warnings<br />They come in large range of different colours<br />The bulbs can break or wear away<br />If there are loose connections the bulb might not work.<br />