Input and Output Devices - Outputs. Output devices  Output devices are used to get data out of a system.  They should be able to do this as accurately.

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Presentation transcript:

Input and Output Devices - Outputs

Output devices  Output devices are used to get data out of a system.  They should be able to do this as accurately and quickly as possible, and with the minimum of human intervention.

Output devices  The most common types of output devices are: Visual devices (including Visual Display Units [VDUs], screens, and monitors) Hard copy devices (including ink jet printer, laser printers, dot-matrix printers, and plotters) Sound devices Computer controlled devices (including robots)

Visual devices  The most common visual device is the visual display unit (VDU).  These are also known as computer screens and monitors.  The types of visual display unit found in common usage are based on cathode ray tube or liquid crystal display (LCD) technology.

Visual devices - VDUs Visual Display Unit (Monitor) (Screen) Liquid Crystal Display (LCD)

Visual devices - Projectors  These are very useful in circumstances where a user wants to show a large group of people the same information simultaneously.

Visual devices - Projectors A typical projector. This type uses combinations of red, green, and blue light to create the projected image.

Hard copy devices - Printers  The most common types of printer are the laser and the ink jet printers.  A less common type of printer is the dot-matrix printer.

Hard copy devices - Printers Ink jet printerLaser printer

Hard copy devices - Plotters  Plotters are a very specialised type of output device, and are usually found where high quality technical drawings or graphs have to be produced.

Hard copy devices - Plotters Typical plotters

Sound devices - Speakers and Headphones  The speakers and headphones used with computers are usually compatible with other devices such as stereo systems.

Computer controlled devices  A variety of different control devices can be connected to a computer.  These include robotic arms and motors (also known as actuators).  The most common use of computer controlled devices is in computer- aided manufacturing.

Computer controlled devices - Robots A typical computer controlled device used in computer- aided manufacturing – a robotic arm