Output Devices
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Transcript of Output Devices
OUTPUT DEVICES
OUTPUT DEVICES
Output devices translates information processed by the computer into a form you can understand.
Can you guess which of these devices are OUTPUT devices?
OUTPUT DEVICES
Output devices can be divided into two categories: SOFTCOPY output devices and HARDCOPY output devices.
SOFTCOPY HARDCOPY
Monitors (VDUs) Printers
Projectors
Speakers
Video Graphics Card
SOFTCOPY vs HARDCOPY
Softcopy output is information in intangible form i.e. It is displayed on a screen or in audio or voice form through speakers.
Hardcopy output is tangible and refers to output which is printed.
SOFTCOPY OUTPUT DEVICES
Monitors – these are also called Visual Display Units (VDUs). There are two types of monitors. These are Cathode Ray Tube (CRT) and Flat Panel Displays.
CRT MONITORS vs FLAT PANEL SCREENS
Differences between CRT Monitors and Flat panel monitors.
It is less expensive. It is more expensive.
It takes up more desk space.
Doesn’t take up much space.
It uses more energy. Are more energy efficient.
It is heavier and bulkier. Weigh’s much less.
It emits harmful radiation.
Doesn’t emit radiation.
It is used only for PCs. Also used for laptops, PDAs, cellular phones.
SPEAKERS
Normal music system speakers are used to output sound. They convert the sound from electronic form stored in the computer to what the user can understand.
HARDCOPY OUTPUT DEVICES
Printers – Printers can be divided into two broad categories IMPACT and NON IMPACT printers.
IMPACT printers produce their output when the printing mechanism strikes the paper to make a print.
NON IMPACT printers produce their output without their printing mechanism making any impact with the paper.
IMPACT PRINTERS
Two common impact printers are DOT MATRIX printers and LINE printers.
Dot Matrix Printer Line Printer
DOT MATRIX PRINTERS
Dot matrix printers contain a print head with up to 24 pins arranged in a rectangular pattern (matrix). These print one character at a time which are formed by specific patterns of dots struck by the pins. The print quality is not very good and they are slow.
LINE PRINTERS
A Line printer is an impact printer which appears to print one line at a time.
NON IMPACT PRINTERS
Four types of Non Impact printers are: LASER printers, INKJET printers, PLOTTERS and THERMAL printers.
Laser Printer Inkjet Printer Thermal Printer
Plotter
LASER PRINTERS
Used in many large companies or institutions. They produce very high quality output at terrific speeds. They are also called PAGE printers because the appear to print an entire page at a time. Some can produce up more than 40 pages per minute.
http://www.youtube.com/watch?v=KtXes1sgUb4
This video gives you a good idea of how a laser printer produces output.
INKJET PRINTERS
These printers produce their output by spraying small, electrically charged droplets of ink from nozzles, through holes, at a high speed, onto the paper. The quality of printing is high but not as high as laser printers.
http://www.youtube.com/watch?v=N3e55hXt-LA&feature=related
This video gives you a good idea of how an inkjet printer produces output.
THERMAL PRINTERS
These have a print head made up of pins arranged in a pattern (matrix). These pins are heated electrically and burn the characters onto heat-sensitive paper.
PLOTTERS
A Plotter is a special printer designed to produce high quality graphics in vibrant colour on a large scale. They are especially useful for creating maps, billboards, banners, architectural drawings and charts.