output devices of computer

The result obtained after processing input is called the output. The devices used to output the data are called output devices. Monitor, printer, speaker, plotter, headphone, projector, etc. are output devices for the computer.

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Output Devices Of Computer Schema

  • Visual Display Unit (VDU)
    • Types of monitor based on color
      • MDA/MGA
      • CGA
      • HGA
      • EGA
      • VGA
      • SVGA
  • Printer
    • Type-based on theory
      • Impact Printer
      • Non-Impact Printer
    • Type-based on speed
      • Character printer
        • Dot Matrix Printer
      • Line Printer
        • Drum Printer
        • Chain Printer
      • Page Printer
        • Laser Printer
        • Inkjet Printer
  • Speaker
  • Headphone & Earphone
  • Projector
  • Plotter

Visual Display Unit (VDU)

Visual Display Unit is the standard output device which is also called a monitor, display screen, etc. It is used to view the graphical or text images. Softcopy vis the output observed on a monitor.

VDU’s are broadly classified based on color, size, and technology.

monitor output devices of computer

Types of monitor based on color

  • MDA/MGA: Monochrome Display Adapter or Graphics Adapter
  • CGA: Color Graphics Adapter
  • HGA: Hercules Graphics Adapter
  • EGA: Enhanced Graphics Adapter
  • VGA: Video Graphics Adapter
  • SVGA: Super Video Graphics Adapter

The types of monitors based on sizes are 8″, 12″, 14″, 17″, 20”, 21″ etc.

The types of monitors based on technology are Cathode Ray Tube (CRT) technology and Liquid Crystal Display (LCD) and Light-Emitting Diode(LED) technology.

All technologies support various sizes and resolutions of the monitor.

For example, CRT monitors are used in microcomputers. LCD monitors are normally used in notebook computers. The main objective of using an LCD display is to reduce the size of the monitor.

Resolution: The number of pixels per inch is known as resolution. The resolution increases with an increase in pixels.


The printer is used to print the output, such as graphics and text, on paper. The output obtained from the printer is called a hardcopy.

Type-based on theory(computer output devices)

Basically, the printer is classified into two categories Impact printers and Non-impact printers.

printer theoretical types

Impact printers

A print hammer strikes a ribbon to create a print on the paper. They are slow and cheap.

Non-impact printers

These do not have a print hammer and uses either thermal, electrostatic, chemical, or inkjet technologies. They are fast and cost more than the impact printers.

Type-based on speed(computer output devices)

Based on the speed of printing, the printers are classified as character, line, and page printers.

Printer types based on speed

Character Printer

  • Character printer prints one character at a time.
  • The speed of the character printer is measured in CPS (Character Per Second).
  • Character printers can print black and white as well as in color.

For Example Dot Matrix Printer, etc.

Dot Matrix printer

In a dot matrix printer, there is an arrangement of tiny hammers called pins. These pins strike on a ribbon against a paper to produce the desired character. Each hammer prints a small dot on the paper and several pins strike together to form letters.

Line Printer

  • A line printer can print one line at a time.
  • The speed of the line printer is measured in LPM (Lines Per Minute).

For Example Drum printers, chain printers, etc.

Drum printer

Drum printer is an old line printer.

This consists of a cylindrical drum on which the character to be printed is embossed for each and every print position on a line. Striking a hammer against the embossed character can print a character.

Chain Printers

In chain printers (also known as train printers), the character set is arranged multiple times around a chain that travels horizontally. The paper presses forward against a ribbon which is then pressed against the character form and the impression of the character form is printed onto the paper.

Page Printer

  • Page Printer can print one page at a time.
  • The speed of the page printer is measured in DPI (Dots Per Inches).

For Example Laser printers, Ink-jet printers, etc.

Laser Printer

Laser printers use a laser beam to produce the dots needed to form characters on a page.

Inkjet Printer

Inkjet printer either operates on the continuous-stream inkjet approach or the drop-on-demand inkjet approach.

Speaker(computer output devices)

speaker computer output devices

Speakers convert digital audio computer signals into audible output.

Computer speakers or multimedia speakers are external speakers.

There are also advanced forms of computer speakers that have graphic equalization features.

Nowadays for computer, there is two types of speaker wired and wireless.

Wired speakers are the speaker who is connected to the computer with the help of wires.

Wireless speakers are the speaker which is connected to the computer with the help of Bluetooth technology or with the help of a USB type technology called Radiofrequency(RF) wireless Device.

Headphones & Earphones

headphone computer output devices

Both of them are used to hear the sound produces by the computer on our ears directly without any disturbance in the environment around the computer.

And both of them also come in wired and wireless technology.

In wired technology headphones & earphones companies use a different kind of wires, and in wireless technology companies uses Bluetooth technology.


projector computer output devices

Nowadays projector is one of the most used output devices of the computer. This is used in many areas like in school for studies, in-home for enjoying entertainment videos, etc.

In the old-time projectors are not digital they are used manually by playing Disk on them. But nowadays the immerging of technology era projector become digital and used in many areas and easily controlled by many devices like computer, Smartphone, etc.

Plotter(computer output devices)

A Plotter is a vector graphics-printing device that is connected to a computer.

Plotters print the output by moving a pen across the surface of a paper.

They can draw complex lines, art, including text, but they are very slow because of the mechanical movement of the pens.

Plotters are incapable of creating a solid region of color but can hatch an area by drawing a number of close regular lines.