Output Devices
Output Devices
Maninder Kaur
[email protected]
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Visual Display Unit
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Printers
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Plotters
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Speakers
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Devices that display, print, or transmit the
results of processing from the computer’s
memory.
Before an output can be produced by a
computer it must have an output device
connected to it.
• A visual Display Unit (VDU) or Monitors are the most
popular output devices used for producing soft-copy output.
• Monitors can display graphics, text and video. The size of a
monitor is measured in inches diagonally across the screen;
15, 17, 19 and 21 inch monitors are the most common
sizes. A color monitor can display from 16 to over 1 million
different colors.
Visual Display
Unit (VDU)
• A printer is an output device that produces a printout or
hard copy of the output from a computer. There are many
types of printer available.
• The speed of printers can be measured in characters per
second (CPS) or pages per minute (PPM), the higher the
values are, the faster the printer can produce output.
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Impact Printers: An impact printer forms
characters and graphics on a piece of paper
by striking a mechanism against an ink
ribbon that physically contacts the paper.
Non-Impact Printers: A non-impact printer
forms characters and graphics on a piece of
paper without actually striking the paper.
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Daisy Wheel Printer
Dot-Matrix Printer
Line Printer
Ink-Jet Printer
Laser Printer
Plotter
• A dot matrix printer forms characters and graphics on the
paper by producing pattern of dots.
• Dot matrix printers are relatively cheap and so is the
stationery that they use.
• Dot-matrix printers are generally noisy.
• Slow, with speeds usually ranging between 30 to 600
characters per second.
Dot Matrix Printer & Printout
• This is a non-impact printer that forms characters and
graphics by spraying tiny drops of liquid ink onto a piece of
paper.
• Inkjet Printers are very quite to operate and can produce good
quality printouts of both graphics and text.
• Inkjet printers are generally quiet.
• Inkjet printers can produce high quality color output.
Inkjet
Printer
DAISY WHEEL PRINTER
• A daisywheel printer is an impact printer that uses a wheel as
a print head. As the wheel rotates, a hammer strikes the
backside of the spoke and presses it against the paper to
print a character.
• Can print letter quality characters.
• Printing speed is very slow.
Daisy
Wheel
Printer
• The mechanism of how a laser printer works is similar to a
photocopier. Laser printers are also known as page printers
because they process and store the entire page before they
actually print it.
• Laser printers can print text at speeds of four to over thirty
pages per minute.
• The cost per page of toner cartridges is lower than other
printers.
• Laser printers are quiet and fast.
Laser
Printer
• A plotter is a large printer that generates high-quality
documents by moving ink pens over the surface of a page.
• Plotters are particularly useful to engineers and architects, as
they produce high-quality blueprints, maps, and floor plans.
• Can print on large printers.
• High quality printing.
• Plotters are expensive.
Plotter
• A speaker, or speaker system converts an electrical signal to
sound.
• The term loudspeaker can refer to individual transducers
(known as drivers), or to complete systems consisting of a
enclosure incorporating one or more drivers and electrical filter
components.
• Loudspeakers are the most variable elements in an audio
system and are responsible for the greatest degree of audible
differences between sound systems.
Speakers
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