Output Device

Output devices

Introduction
In this presentation we will talk about Output device.
Output device are very useful.
For example monitor, printer and speakers.

Monitors
Picture on monitor are made out of thousands of colour dots called pixels.
Higher the pixel higher the quality.
There are two type of monitor
Cathode ray tube (CRT)
Thin film Transistor (TFT)

Cathode ray tube
CRT are outdated
Large and bulky
Glass screen
Produce a lot of heat
Noisy compare to TFT

Thin film transistor
Replacement of OCR
Nicer and take up less space
They are quieter than CRT
Easily to damage
The colour and contrast are not so good as a CRT. Unless you have a very high quality one.
The picture can look a bit dull.

Printers
They are use to create a hard copy of your work.
Most printer produce work on paper.
There are 4 type of printer
Laser printers
Ink-jet printers
Dot-matrix printers
Plotters

Laser printer
Quiet
Print large number of sheets very quickly and they produce high quality documents.
Used powdered ink called toner
Cost per page is low
Most expensive printer to buy
Toner are more expensive than ink-jet cartidges.
Larger than ink-jet
Can’t create carbon copies like the dot-matrix.

Ink jet Printers
Cheap to buy
Can combine both black and white and colour printing at the same time
Use cartridges which contain ink
Useful for few document needed and the quality of the printout doesn’t need to be perfect.
They are more compact than laser
Cartridges cost less to replace than toners.
Better quality than dot-matrix
Slower than laser
Noiser than laser
Cartridges need to be replace more often than laser
Cartridges can dry out

Dot-matrix
Impact printer
Different combination of pins are pushed out to form different characters.
Very noisy
It is useful when you need carbon copies like bills.
Cheap to buy
Low operating cost
Can print continuously
Create carbon copies
Poor quality
Very slow to print
Noisy
Cannot produce colour copies.

Plotters
Specialist type of printer which able to draw high quality image over a very large piece of paper.
Used by engineers, architects and map-makers.
A plotters uses pen to draw images.
There are now pen-less plotters.
Drawing are the same quality as the expert.
Larger sizes of paper can be used than most printers
Slower than other printer
More expensive than printer
Do not produce high quality text printout.
There are 3 different type of plotters
Flatbed-hold the paper still while the pen move
Drum plotters- these roll paper over the cylinder
Pinch-rollers plotters- these are a mixture of the two type above.

Speakers
Most computer fit a small internal speakers which will produce a beeping sound when you made an error.
Everyone in the room can hear output from computer.
Help to create atmosphere
Help blind people to use computer
The sound can disturb other people while they are trying to do their work.
High quality speakers can be expensive

Lights (LEDs)
Light can be connect to computer and respond to the signal which tell them to switch on or off
Used in a computer to help to show that it is working correctly
Can provide warnings
They come in large range of different colours
The bulbs can break or wear away
If there are loose connections the bulb might not work.

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Output Device

by Kikaboo6938 on Nov 30, 2009

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Output Device — Presentation Transcript