INFORMATION TECHNOLOGY OUTPUT DEVICES. What is an output device Hardware that allows the user to see processed data or information. Examples are monitors.

INFORMATION TECHNOLOGYINFORMATION TECHNOLOGY

OUTPUT DEVICES

What is an output deviceWhat is an output deviceHardware that allows the user to

see processed data or information. Examples are monitors or visual display unit, printers, speakers, fax machines and modems.

Can you guess which of Can you guess which of these devices are output these devices are output devices?devices?

Types of outputTypes of outputThere are two types of output:Softcopy and Hardcopy

Output

Softcopy output

Hardcopy output

What is the difference What is the difference between softcopy and between softcopy and hardcopy.hardcopy.Softcopy output is also called

temporary output. It refers to information displayed on a screen or in audio or voice form through speakers.

Hardcopy output is also called permanent output. It refers to output printed on paper.

Hardware for softcopy Hardware for softcopy outputoutput

Hardware for hardcopyHardware for hardcopy

Softcopy output - MonitorsSoftcopy output - MonitorsThis type of

monitor is called the Cathode Ray Tube or CRT. This is the traditional type of monitors for television and computer screens.

Monitors – Cathode Ray Monitors – Cathode Ray TubeTube

Large, heavy and bulkyCheaper than flat panel

screensAre being replaced by

flat panel screens Colour accuracy and

brightness – excellent

Softcopy output - MonitorsSoftcopy output - MonitorsThis monitor is

called the Flat Panel Display screen. Flat screens are mostly used on portable computers like laptops but now it is used for televisions and desktop computers as well.

Monitors – Monitors – Flat Screen Flat Screen Panel Panel

Technologies used:

LCD – Liquid Crystal Display

TFT – Thin Film Transistor

OLED - Organic Light - Emitting Diodes

Light in weightLess bulky –

occupies much less space

Very good picture quality

Softcopy output – LCD Softcopy output – LCD ProjectorsProjectors

Used for presentations –

when a large viewing area is needed

Image is projected on a screen, wall or large surface.

Softcopy output - Softcopy output - SpeakersSpeakers

Normal music systems speakers are used to output sound. The quality of the sound depends on the type of system used, the size of the speakers and the computer’s audio card.

Hardcopy outputOne hardware used for hardcopy

output is a printer.Printers are divided into two

groups:A) Impact printersB) Non-impact printers

What is an impact printer?

Impact printers strike through a carbon or inked ribbon, like a typewriter.

They are noisy and do not usually print acceptable graphics.

However, they are useful for printing multiple copies using carbon paper

Print mechanism is cheap, and ribbons are long lasting

Examples of impact printers areDaisy wheel printer

Dot matrix printer

This video shows a dot matrix printer in operation.

http://www.youtube.com/watch?v=qlEUrEVqDbo&feature=related

Line printer

What is a non-impact printer?These printers do not normally

strike the paper.Instead ink spray or toner powder is

used which can be costly.The characters or letters are fixed

onto the paper by heating for example.

Because printing is simple and has no moving parts, it prints silently and quickly.

Examples of non-impact printers are:Ink jet printer

This video explains how an inkjet printer produces output.

http://www.youtube.com/watch?v=N3e55hXt-LA&feature=related

Laser printer

This video explains how a laser printer produces output.

http://www.youtube.com/watch?v=KtXes1sgUb4

PlottersDraws on paper

using a penUsed to print

large architectural drawings

This video shows briefly how a plotter works

http://www.youtube.com/watch?v=dxBJ4Ym1HoA

ModemsAnother output

device is a modem.

A modem enables a computer to send data to and receive data from another computer over a telephone line.

Summary of output devicesSummary of output devicesExplain the difference between impact

printers and non-impact printers.Give an example of how a dot matrix

printer can be useful today.Give two examples of softcopy devices

and two examples of hardcopy devices.Which output device would you used to

print a car design or house plan?Which output device is used to show

students a PowerPoint presentation?