1. Output Device
 A device used to display the results.
 Output device converts data from binary form to
human readable form.
 Output device can display, print or plot the
processed data.
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2. Output devices
 Monitor or Screen or VDU
 Printer
 Plotter
 Speaker
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3. Monitor
 The monitor looks like a TV screen.
 Monitors available in 14”, 15”, 17” and even 21”.
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4. Monitors are categorized into
 CRT
 Flat –Panel displays
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5. CRT monitor
 CRT means Cathode Ray Tube
 It works with one or more electron guns that
systematically aim a beam of electrons at every pixel
on the screen.
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6. Flat-Panel monitor
 The most commonly used flat-panel monitor is LCD
(Liquid Crystal Display).
 It creates images with a special kind of liquid crystal
that is normally transparent but becomes opaque
when charged with electricity.
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7. Monitor
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8. Printer
 Another important output device is the printer.
 Types of Printers
1. Impact printers
2. Non-Impact printers
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9. Impact Printer
 It creates an image on paper by striking on the inked
ribbon, and prints a character.
 It works like a typewriter, which uses small hammers
to strike the ribbon.
 Example: dot matrix printer.
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10. Dot matrix printer
 It is a common type of impact printer.
 It uses a print head, which contains a cluster of
pins.
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11. Dot matrix printer (contd...)
 The printer can push the pins out to form patterns in
rapid sequence.
 The pins are used to press an inked ribbon against
paper, thus creating an image.
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12. Dot matrix printer
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13. Non Impact Printer
 Non impact use various methods to place ink (or
another colored substance) on the page.
 Example :Ink jet printers use tiny nozzles to spray
droplets of ink onto the page.
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14. Inkjet printer
 An ink jet printer is an example of non-impact
printer.
 It creates an image by spraying tiny droplets of ink
onto the paper.
 Ink jet printers are inexpensive.
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15. Inkjet printer
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16. Laser Printer
 It is a non-impact and letter quality printer.
 It produce higher quality print and is fast
and convenient to use
 It is more expensive than ink jet printer.
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17. Laser Printer (contd)
 They use heat and pressure to bind tiny particles of
toner (a dry ink) to paper.
 Laser printers are available in both color and black &
white.
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18. Laser Printer (Color)
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19. Laser Printer
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20. Summary
In this class, we have learnt about
Functions of input and output devices.
Different types of input and output devices.
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21. Frequently Asked Questions
1. Describe the functions of input and output
devices?
2. List different input and output devices?
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22. Quiz
1. A _____ is just like a type writer.
a. key board.
b. printer
c. Scanner
d. Plotter
Answer: a
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23. Quiz (Contd...)
2. A monitor is
a. Input device
b. Memory device
c. Output device
d. none of the above
Answer: c
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24. Quiz:
3. Scanner is
a. input device
b. output device
c. Memory device
d. None of the above
Answer: a
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25. Quiz (Contd...)
4. What is used for select and move items on the
screen.
a. Mouse
b. Keyboard
c. Light pen
d. Scanner
Answer: a
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