The document provides an overview of various computer output devices including monitors, speakers, printers, plotters, headphones, and projectors. It discusses the purpose and basic functioning of each device type. For monitors, it covers CRT and LCD technology as well as resolution. For printers, it distinguishes between impact and non-impact types such as dot matrix, inkjet, and laser printers. Projector types discussed are CRT, LCD, and DLP.

1. OUTPUT DEVICES
PRESENTATION BY
M.ZAIN KHALID

2. CONTENTS
• INTRODUTION
• MONITOR
• SPEAKER
• PRINTER
• PLOTTER
• HEADPHONE
• PROJECTOR

3. INTRODUCTION
• Output device receive information from the CPU and Present it to the user in user
understandable form.
• Output device can normally be produce in two ways:
• Either on display unit or
• In a paper
• Form of output on Computer Screen which is in Electronic form is softcopy output
.
• Output on paper which is in non-electronic form is called hardcopy.

4. What is a Monitor ?
• VDT and terminals monitors introduced in 1980’s.
• The monitors are display devices are most-used output device on computer.
• Monitors are very similar to televisions but usually display information at a
much higher resolution.
• Monitors are very important because without them you
wouldn't be able to do anything.

5. History On Monitor
• VDT and terminals monitors introduced in 1980’s.
They only displayed text in 2 colours usually black
and green.
In 1981 IBM introduced the CRT monitors which
could display 16colours.
1990’s LCD monitors were introduced.

6. MONITOR QUALITY AND RESOLUTION
• Quality:
• Manufacturers describe quality by dot pitch.
• The quality of the image on the screen depends upon many factors.
• Resolution:
• Resolution is one of the factor affecting the quality of the monitor.
• The resolution of a monitor refers to the number of pixels on the screen
expressed as a matrix.
• Most modern monitors can display 1024x768 pixels.

7. Speakers
• Speaker is a output device.
• A output device connected to a computer's sound card that outputs sounds
generated by the computer.
• Speakers can be used for various sounds meant to
alert the user, as well as music and spoken text.

8. Advantages & Disadvantages
• Advantages:
• They ‘re very simple to operate .
• Disadvantages :
• They can take up a fair amount desk-space compared to headphones.

9. Printer
• A printer is a device that produces hardcopy on the paper.
• Printers are commonly used in businesses to get the documents printed on
paper.
• Types of Printer:
• Printers can be categorized into:
• Impact Printer
• Non-Impact Printer

10. Types of Printer:
• Impact Printer:
• An impact printer produces images by striking an inked ribbon
with hammer or a set of pins, pressing ink from
the ribbon onto piece of paper.
• Impact printer are oldest technologies.

11. Advantage & Disadvantages
• Advantages:
• Less expensive
• Can make multiple copies with multipart paper
• Disadvantages:
• The impact printer is very Slow.
• Print quality lower in some types

12. Types of impact printer
• Dot- matrix printer :
• Dot matrix printer produces characters by striking pins against an
ink ribbon To printer closely spaced in the appropriate shape .
• The shape forms a number , alphabet or other special characters.
• Dot matrix printer are relative expensive.
• They do not produce high-quality output.

13. Dot-Matrix printer

14. Type of impact printer
• Daisy wheel printer :
• These printer etched at the outer edge of a pedaled wheel which form
characters in the same way as a typewriter.
• Daisy wheel printer are loud and slow.
• They cannot printer graphics , and cannot changes fonts.

15. Daisy- wheel printer

16. Type impact printer
• Line printer:
• These printer is somewhat similar to the daisy wheel - printer is the line
printer.
• Line printer have a mechanism that allows multiple character to the
simultaneously printed on the same line.
• The printer speed ranging from 300 LPM ( lines per minute )to 2400 LPM.

17. Type of printer
• Non- impact printer:
• A non impact printer produces images on paper without striking the page on
the way.
• These printer are inexpensive to manufacture and silent .
• Very fast non-impact printer
• Printing more then 24 pages per minute.

18. Type non-impact printer
• LASER Printer :
• Laser stand for light amplification by stimulated emission of radiation.
• Laser printer are similar to copy machine.
• They use laser beams to burn special ink is called toner on page to create a
permanent images.
• The printer is vary fast and high quality provides.
• Laser printer have speeds of 4,8,12 or more page per minute.

19. Laser printer

20. Non-Impact Printer
• Ink jet printer:
• Ink jet printer is a type of printer that works by spraying ink on sheet a
paper.
• The printer are capable of producing
high quality of printer.
• In general, the price of ink jet printer is
lower then of laser printer.

21. plotter
• Plotter:
• A plotter us a large scale printer that receives commands from a computer to
make drawing on paper with one or more automatic pens.
• Plotters are used in applications such as computer-aided design such as
diagrams, layouts, specification sheets and banners.
• The plotter is capable of producing color drawings in a matter of minutes.
• Plotters are considerably more expensive than printers.

22. Plotter

23. Headphones
• Headphone:
• Headphones give sound output from the computer.
• They are similar to speakers, except they are worn on
the ears so only one person can hear the output at a time.

24. Projector
• Projector:
• An output device that can take the display of a computer screen and project
a large version of it onto a flat surface.
• Projectors are often used in meetings and
presentations so that everyone in the room
can view the presentation.

25. Projector
• Types of projector:
• Cathode Ray Tube (CRT) projector.
• Liquid Crystal Display (LCD) projector.
• Digital Light Processing (DLP) projector.

26. Type of Projector
• Cathode Ray Tube (CRT) projector:
• In the early days of projectors, CRT
projectors were commonly used.
• They utilized three tubes, one for
each of the primary colors.
• Due to their large size, low light output
they are no longer commonly used.
CRT projectors are both larger LCD and DLP projectors.

27. Type of Projector
• Liquid Crystal Display (LCD) projector:
• LCD projectors work by utilizing
polarized mirrors that pass and
reflect only certain colors of light.
• An LCD projector can achieve greater
brightness at a lower energy consumption
• Smaller than CRT projectors

28. Type of projector
• Digital Light Processing (DLP) projector:
• DLP projectors can be classified as
one-chip or three-chip.
• One-chip DLP projectors can
produce more than 16 million colors
while three-chip models can produce
more than 35 trillion colors.
• This allows DLP projectors to reproduce more natural and lifelike images.