Output Devices

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Output Devices

• What is Output?
• Output is data that has been
• processed into a useful form.

ICT Tools Output Devices
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Types of Output

• Hard copy
• Printed on paper or other permanent media.

ICT Tools Output Devices
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Types of Output

• Soft copy
• Displayed on screen or by other non-permanent
  means.

ICT Tools Output Devices
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Examples of Output Devices

• Monitor
• This is the most common output device.

ICT Tools Output Devices
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Screen Features

• Size
• Desktop screens are usually 14 19 inches by
  diagonal measurement. (This is how TV screens are
  measured, too.) Larger sizes are available, at a
  significantly higher cost.
• Resolution
• Determines how clear and detailed the image is.
  Pictures on a screen are made up of tiny dots.
  1 dot on screen 1 pixel. The more pixels per
  inch, the clearer and more detailed the picture.

ICT Tools Output Devices
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Type of Screens

• Monochrome
• One colour text on single colour background,
  i.e. white letters on blue, or green characters
  on black.
• Colour
• Various colours can be displayed.
• Liquid Crystal Display (LCD)
• Used in laptops especially.
• Plasma Screens
• Used for very large screens and some laptops.

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Examples of Output Devices

• Printer
• The job of a printer is to put on paper what you
  see on your monitor. How easy this is to do and
  how successfully it is done determines whether or
  not you are happy with your printer choice.

ICT Tools Output Devices
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Printer Features

• How fast?
• The speed of a printer is measured in
• cps characters per second
• lpm lines per minute
• ppm pages per minute
•   The faster the printing, the more
• expensive the printer.

ICT Tools Output Devices
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Printer Features

• Printer Resolution
• Resolutions measured in dots per inch (dpi). This
  determines how smooth
• a diagonal line the printer can produce. A
  resolution of 300 dpi will produce
• text that shows jagged edges only under a
  magnifying glass. A lower
• resolution than this will produce text with
  stair-step edges, especially at
• large sizes. Evenhigher resolutions are needed to
  get smooth photo
• reproduction. Professionals in graphics use 1200
  to 2400 dpi printers.

ICT Tools Output Devices
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Things to Consider When Choosing a Printer

• How much output?
• what speed is needed? is heavy-duty
  equipment necessary?
• Quality of output needed? 
• letter quality? near letter quality?
  draft?
• Location of printer?
• is loudness important?

ICT Tools Output Devices
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Other Peripherals

• Data Projector
• Projects the image onto a wall screen.

ICT Tools Output Devices
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Other Peripherals

• Digital Camera
• The picture taken with a digital camera is
  stored in computer memory rather than on film as
  in an ordinary camera.

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In this section

•  
• you will become more familiar with various
  peripherals
• you can use this knowledge to help you choose
  those which match your needs.
•  

ICT Tools Output Devices