NCICTVTC KALLADYBATTICALOA

Presentation by NCICT batch 19

HARDWARE DEVICES

OUTPUT DEVICES

These are usually receive data from the CPU and change it into a form which can be understood by humans.

In old days most of the output devices are bigger than the input devices and little heavy but nowadays they are coming in smaller sizes and portable to carryout anywhere.

The most common computer output device is the monitor or computer screen.

Monitors create a visual display from processed data that users can view.

They come in a variety of screen sizes and visual resolutions.There are two types of computer monitors, CRT and flat panel.

CRT monitors use phosphorescent dots to create the pixels that make up display images.

Flat panel monitors usually use LCD or plasma to create output. Light is passed through liquid crystals to create the pixels.

All monitors rely on a video card that is located on the computer motherboard or in a special expansion slot.

The video card processes the computer data into image details that the monitors can display.

Electron Gun which is used in a CRT monitor

CRT monitors are big in size and heavy.

It will take large space to be occupied on a table.

They consume much more electricity to shoot out the electrons from the electron gun(E-gun) and low quality display.

Now we can buy these in low price.

If power supply is low CRT monitor dose not work properly or it doesnt switch on.

Because of this CRT monitors are hated by the people(users), to solve this problem electronic device manufacturers introduced LCD monitors.

LCD monitors are very light weighted and can be occupied on a small space on a table.Electricity consumption is very lower than CRT.You can watch High Definition videos and pictures.High quality display.Very thin and easily portable.

LEDs are much thinner than LCDs and much more low consumption of power.These are portable and expensive.Same as LCD but much more quality than it.

Printers are used to print the output data on paper.

Such output is referred to as printout or hard copy.

There are many different types of printer but only the most common types are listed here:

The most widely used printer which prints one character at a time. The technology has improved during the recent past to include very high quality & reasonably fast printers.

These use rows (a matrix) of needles which are made to impact with an ink-ribbon to make the pattern of the required character on the paper.

Although they are relatively cheap to buy,

Dot-matrix printers are very slow, very noisy and do not give a high quality of print.

Speed in Lines per Minute (LPM)

Used for high volume medium quality applications.

E.g.: printing of public examination results.

A kind of impact printer where the characters are arranged on the ends of the spokes of a wheel (resembling the petals on a daisy).

The wheel (usually made of plastic) is rotated to select the character to print and then an electrically operated hammer mechanism bends the selected spoke forward slightly, sandwiching an ink ribbon between the character and the paper, as in a typewriter.

One advantage of this arrangement over that of a typewriter is that different wheels may be inserted to produce different typefaces.

These squirt quick-drying ink onto paper to form the shape of the character being printed.

In comparison to dot-matrix printers, ink-jet printers are quick, quiet and give a good quality of print; however they are more expensive.

Inkjet printer-cartridge

These printers are same as like inkjet printers

These work in a similar way to photocopiers. A laser beam is used to create an electric charge which attracts special black dust to it. The dust is then transferred to the paper to produce the printed output.

Laser printers are faster and quieter than ink-jet printers and produce a very high quality print.

They are also relatively expensive.

Computers can be used to output sound in the form of speech and music.

This has obvious applications in entertainment and musical composition, and the ability of computers to produce speech has important implications for their use by visually impaired people.

Plotters are devices which, in response to output signals from the computer, cause a pen to move across a sheet of paper to produce drawings such as graphs.

A plotter is a specialized output device designed to produce high-quality graphics in a variety of colors. Drum plotters and flat bed plotters both use pens and electrostatic plotters do not.

Projector is a device that can display in a very large screen.

Projectors are used to show videos, pictures or a demonstration in a big crowed of people.

These are not commonly used in normal issues because these projectors are much more expensive than other devices that have been mentioned above.

As demonstrated above output devices are most important to humans because without them humans cant get the output for the input as they preferred way.

Some examples of output device manufactures :

Most of the manufacturers those listed above were also producing the other output devices too.

THANK YOU

Presentation by

Anushyendan,Biruntha

Niraimathey ,Desiraj, Hemalda

Elizabeth,Keerthana

NCICT BATCH 19