1ab input output devices
TRANSCRIPT
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Output Devices
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Introduction
“An output device is any hardware used to communicate processed data to the user, e.g. Monitor, speakers and printers.”
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Printers
One of the most One of the most popular output popular output devicesdevices
Inkjet printers Laser printers Graph plotters Dot matrix printers Thermal printers Braille printers
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Inkjet printers
Popular for domestic use Small jets of ink sprayed on to paper Three systems used for printing
– Nozzles controlled by crystals which change shape– Ink heated and pushed through nozzles (bubblejet)– Continuous flow – ink squirts continuously from
nozzles
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Laser Printers
The most versatile – but are more expensive Pages are set up in full before printing They have four main parts:
– Rotating drum – has an electrical charge– Laser – etches a negative electrically charged
image onto the drum– Toner cartridge – drum attracts ink from toner
cartridge to areas that are charged– Fuser unit – heats the paper, to make ink stick
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What do you want from your printer?
Speed– Lasers fast – but modern inkjets can be just as fast
Resolution– Lasers offer best quality with highest dpi – but modern inkjets
also offer very good quality Initial Cost
– Cost of colour lasers has reduced significantly – but inkets are still cheaper
Running Costs– Lasers are cheaper if you print out a lot of pages
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Graph plotters
Often used with CAD An arm moves over the paper, spraying ink Designed to handle large sheets of paper Output – high quality vector graphics
– Good for architectural drawings
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Dot matrix printers
Used a lot in the past – receipts
Print a series of dots that form characters
Useful if carbon copies are needed as they are impact printers
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Thermal printers
Often used in calculators and fax machines
Marks transferred to paper, using heat
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Braille printers
Also known as embossers Create sequences of raised
dots on the paper
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Braille sensing
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Monitors
Also known as VDUs (Visual Display Units)
Two main types : – CRT (Cathode Ray Tube)– Flatscreen – LCD – TFT -
Plasma
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LCD Projectors
This presentation is being output by a LCD projector.
Also known as beamers
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Speakers
Add another dimension
Integral part of any multimedia system
Can be used as primary output – speech output for the visually impaired
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Finally.....remember....
G.I.G.O.– Garbage– In– Garbage– Out