computer output devices

Output device:-

An output device is any  peripheral that receives data from a computer, usually for display, projection, or physical reproduction. For example, the image shows an inkjet printer, an output device that can make a hard copy  of any information shown on your monitor, which is another example of an output device. Monitors and printers are two of the most common output devices used with a computer.

Types of Output devices:-

The following list contains many different output devices. For further information, select any of the listings with blue text.

  • 3D Printer
  • Braille embosser
  • Braille reader
  • Flat panel
  • GPS
  • Headphones
  • Computer Output Microfilm (COM)
  • Monitor
  • Plotter
  • Printer (Dot matrix printer, Inkjet printer, and Laser printer)
  • Projector
  • Sound card
  • Speakers
  • Speech-generating device (SGD)
  • TV
  • Video card
    Some Output devices are given here
    Monitors:-
    • Monitors, commonly called as

Visual Display Unit

    •  (VDU), are the main output device of a computer. It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels.

There are two kinds of viewing screen used for monitors.

      • Cathode-Ray Tube (CRT)
      • Flat-Panel Display

Cathode-Ray Tube (CRT) Monitor

The CRT display is made up of small picture elements called pixels. The smaller the pixels, the better the image clarity or resolution. It takes more than one illuminated pixel to form a whole character, such as the letter ‘e’ in the word help.

Flat-Panel Display Monitor

The flat-panel display refers to a class of video devices that have reduced volume, weight and power requirement in comparison to the CRT. You can hang them on walls or wear them on your wrists. Current uses of flat-panel displays include calculators, video games, monitors, laptop computer, and graphics display.

The flat-panel display is divided into two categories −

  • 1. LCD- Liquid crystal display 
  • 2-LED-Light Emitting Diodes

Printers

Printer is an output device, which is used to print information on paper.

There are two types of printers −

  • Impact Printers
  • Non-Impact Printers

Impact Printers

Impact printers print the characters by striking them on the ribbon, which is then pressed on the paper.

Characteristics of Impact Printers are the following −

  • Very low consumable costs
  • Very noisy
  • Useful for bulk printing due to low cost
  • There is physical contact with the paper to produce an image

These printers are of two types −

  • Character printers
  • Line printers

Character Printers

Character printers are the printers which print one character at a time.

These are further divided into two types:

  • Dot Matrix Printer
  • Daisy Wheel

Dot Matrix Printer

In the market, one of the most popular printers is Dot Matrix Printer. These printers are popular because of their ease of printing and economical price. Each character printed is in the form of pattern of dots and head consists of a Matrix of Pins of size (5*7, 7*9, 9*7 or 9*9) which come out to form a character which is why it is called Dot Matrix Printer.

Dot Matrix PrinterAdvantages

  • Inexpensive
  • Widely Used
  • Other language characters can be printed

Disadvantages

  • Slow Speed
  • Poor Quality

Daisy Wheel

Head is lying on a wheel and pins corresponding to characters are like petals of Daisy (flower) which is why it is called Daisy Wheel Printer. These printers are generally used for word-processing in offices that require a few letters to be sent here and there with very nice quality.

Daisy Wheel PrinterAdvantages

  • More reliable than DMP
  • Better quality
  • Fonts of character can be easily changed

Disadvantages

  • Slower than DMP
  • Noisy
  • More expensive than DMP

Line Printers

Line printers are the printers which print one line at a time.

Line PrinterThese are of two types −

  • Drum Printer
  • Chain Printer

Drum Printer

This printer is like a drum in shape hence it is called drum printer. The surface of the drum is divided into a number of tracks. Total tracks are equal to the size of the paper, i.e. for a paper width of 132 characters, drum will have 132 tracks. A character set is embossed on the track. Different character sets available in the market are 48 character set, 64 and 96 characters set. One rotation of drum prints one line. Drum printers are fast in speed and can print 300 to 2000 lines per minute.

Advantages

  • Very high speed

Disadvantages

  • Very expensive
  • Characters fonts cannot be changed

Chain Printer

In this printer, a chain of character sets is used, hence it is called Chain Printer. A standard character set may have 48, 64, or 96 characters.

Advantages

  • Character fonts can easily be changed.
  • Different languages can be used with the same printer.

Disadvantages

  • Noisy

Non-impact Printers

Non-impact printers print the characters without using the ribbon. These printers print a complete page at a time, thus they are also called as Page Printers.

These printers are of two types −

  • Laser Printers
  • Inkjet Printers

Characteristics of Non-impact Printers

  • Faster than impact printers
  • They are not noisy
  • High quality
  • Supports many fonts and different character size

Laser Printers

These are non-impact page printers. They use laser lights to produce the dots needed to form the characters to be printed on a page.

Laser PrinterAdvantages

  • Very high speed
  • Very high quality output
  • Good graphics quality
  • Supports many fonts and different character size

Disadvantages

  • Expensive
  • Cannot be used to produce multiple copies of a document in a single printing

Inkjet Printers

Inkjet printers are non-impact character printers based on a relatively new technology. They print characters by spraying small drops of ink onto paper. Inkjet printers produce high quality output with presentable features.

Inkjet PrinterThey make less noise because no hammering is done and these have many styles of printing modes available. Color printing is also possible. Some models of Inkjet printers can produce multiple copies of printing also.

Advantages

  • High quality printing
  • More reliable

Disadvantages

  • Expensive as the cost per page is high
  • Slow as compared to laser printer

 

Plotter:-

Plotter is a graphical printer that is operated by moving a pen over the surface of a paper. It uses mechanical, Inkjet or internal technology to create large format  images  .

 

Speakers:-

Speakers are used to produces audio Output.The speakers works in conjugation with sound card to produce the audio output. A sound card translate digital signal into analog signal that drive the speakers.

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