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Output Devices (1)
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- 1Computer Monitor (VDUs)Known as visual display units. A monitor gives a visual display of the information being created by the computer.
- 2Three main types of VDU technology:Cathode Ray Tube (CRT)- Display high quality images and are cheaper and more long lasting than the monitors.
Plasma Screen Monitors- Trap a group of gases between two glass panels. Electrical signals are used to change the properties of the gas so it displays a visual image.
Liquid Crystal Display (LCD)- Most popular currently used. Uses electrical signals to light up individual dots or pixels. - 3Benefits of LCD monitors:They are very thin, so take up less space on a desk or shelf
They do not generate as much heat as a CRT monitor - 4Drawbacks of LCD monitors:They do not have as good a picture quality as CRT monitors
Viewing angle is not as good as CRT monitors meaning that the picture quality is lower when viewed. - 5Data projectors:Takes a video signal and projects it onto a surface using a lens and a bulb to create a strong beam of light.
- 6Two main uses:To project slide show presentations onto a screen so that they can be seen by a large group of people in a room or lecture hall.
As part of a home cinema system. - 7Benefits:Better and cheaper than monitors for displaying very large sized images.
Portable, so can be carried between locations. - 8Drawbacks:It can be very expensive to replace the bulb.
It is dangerous to look directly into the data projector whilst it is operating.
They work best in darkened rooms, making them impracticable in certain daylight conditions.
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- GCSE Business Communications & Systems Fichas sobre Output Devices (1), creado por Henry Lane el 19/04/2017.
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- Henry Lane
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