Output Devices
Output Devices
Maninder Kaur
[email protected]
Visual Display Unit
Devices that display, print, or transmit the
results of processing from the computer’s
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.
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.
Daisy Wheel Printer
Dot-Matrix Printer
Line Printer
Ink-Jet Printer
Laser Printer
• 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
• 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.
• 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.
• 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
• Laser printers are quiet and fast.
• 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.
• A speaker, or speaker system converts an electrical signal to
• 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
• Loudspeakers are the most variable elements in an audio
system and are responsible for the greatest degree of audible
differences between sound systems.
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