Output devices of computer system

 output devices of computer system

 Following are few of the important output devices which are employed in a computer.

* Monitors

* Graphic Plotter

* Printer 

Monitors 

Monitors, commonly called as Visual Display Unit (VDU), are the most output device of a computer. It forms images from tiny dots, called pixels that are arranged in a very rectangular form. The sharpness of the image depends upon the amount of pixels. 

There are two styles of viewing screen used for monitors.

* CRT (CRT)

* Flat- Panel Display Cathode-Ray Tube (CRT) Monitor:

The CRT display is formed from small picture elements called pixels. The smaller the pixels, the higher the image clarity, or resolution. It takes quite one illuminated pixel to create whole character, like the letter within the word help. A finite number of characters is displayed on a screen directly. The screen will be divided into a series of character boxes - fixed location on the screen where a typical character are often placed. Most screens are capable of displaying 80 characters of knowledge horizontally and 25 lines vertically. 

There are some disadvantages of CRT:

* Large in Size

* High power consumption CRT Monitor Flat-Panel Display Monitor The flat-panel display refers to a category of video devices that have reduced volume, weight and power requirement compared to the CRT. You’ll hang them on walls or wear them on your wrists. Current uses of flat-panel displays include calculators, video games, monitors, notebook computer, graphics display.

The flat-panel display is split into two categories: 

*Emissive Displays - The emissive displays are devices that convert power into light. Example are plasma panel and LED (Light-Emitting Diodes). 

*Non-Emissive Displays - The Non-emissive displays use optical effects to convert sunlight or light from another source into graphics patterns. Example is LCD(Liquid-Crystal Device) Flat Monitor

Printers:

 Printer is an output device, which is employed to print information on paper. There are two sorts of printers.

* Impact Printers

* Non-Impact Printers Impact Printers The 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 because of low cost 

* there's physical contact with the paper to supply a picture

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:

* Matrix Printer(DMP)

* Daisy print wheel

Dot Matrix Printer: In the market one among the foremost popular printers is matrix Printer. These printers are popular due to their easy printing and economical price.

Each character printed is in variety of pattern of dots and head consists of a Matrix of Pins of size (5*7, 7*9, 9*7 or 9*9) which kick off to make a personality that's why it's called matrix Printer.

 Advantages:

* Inexpensive

* Widely Used

* Other language characters will be printed

Disadvantages:

* Slow Speed

* Poor Quality Daisy Wheel PRINTER Head is lying on a wheel and pins such as characters are like petals of Daisy (flower name) that's why it's called daisy print wheel Printer. These printers are generally used for word-processing in offices which require some letters to be sent here and there with very nice quality.

Advantages:

* More reliable than DMP

* Better quality 

* The fonts of character are often easily changed 

Disadvantages: 

* Slower than DMP

* Noisy

* costlier than DMP Line Printers Line printers are the printers which print one line at a time. These are of further two types

* line-at-a-time printer

* impact printer 

Drum Printer: 

This printer is sort of a drum in shape so it's called line printer. The surface of drum is split into number of tracks. Total tracks are adequate size of paper i.e. for a paper width of 132 characters, drum will have 132 tracks. a personality set is embossed not off course. The various lists available within 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 may print 300 to 2000 lines per minute.

Advantages

* Very high speed Disadvantages

* Very expensive

* Characters fonts can't be changed Chain Printer In this printer, chain of character sets are used so it's called impact printer. a customary list may have 48, 64, or 96 characters. Advantages

* Character fonts can easily be changed.

* Different languages will be used with the identical printer.

Disadvantages

* Noisy Non-impact Printers Non-impact printers print

The characters without using ribbon. There are two types of printers. To print an entire page at a time in order that they also are called as Page Printers. 

These printers are mainly two types

* Laser Printers

* Inkjet Printers Characteristics of Non-impact Printers

* Faster than impact printers.

* they're not noisy.

* top quality.

* Support many fonts and different character size.

Laser Printers: 

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

Advantages

* Very high speed

* Very prime quality output

* Give good graphics quality

* Support many fonts and different character size

Disadvantages

*Expensive.

* can't be wont to produce multiple copies of a document in a very single printing.

Inkjet Printers:

Inkjet printers are non-impact character printers supported a comparatively new technology. They normally print characters by spraying small drops of ink onto paper. Inkjet printers produce prime quality output with presentable features. They make less noise because no hammering is completed and these have many kinds of printing modes available. Colour printing is additionally possible. Some models of Inkjet printers can produce multiple copies of printing also.

Advantages

* top quality printing

* More reliable Disadvantages

* Expensive as cost per page is high

* Slow as compared to electrostatic printer

video tutorial of output devices