1. AS Level ICT
Selection and use of output methods, media, and devices: Screens, plotters, and speakers
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

2. Output methods
Outputs come in a variety of different formats including:
Hard copy (e.g. paper printouts)
On-screen display (e.g. webpage)
Digital outputs as inputs (e.g. a weather station’s output is sent in digital form to the National Weather Centre’s computer, where it becomes part of the inputs the computer needs to track and predict the national weather picture)
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

3. Output methods
Digital outputs to portable devices (e.g. files saved from a computer onto an IPod or MP3 player)
Digital outputs as control signals (e.g. computer aided manufacture)
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

4. Output devices Outputs devices include: Printers
Screens (also called Visual Display Units)
Plotters
Speakers and headphones
Any device that produces output media (e.g. Flash drives, removable hard drives, CD-ROMs, CD-RW, DVDs)
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

5. Screens/Visual Display Units
The first computer screens were based on television technology
They used cathode ray tubes (CRT) to display data onscreen, and were large and cumbersome
They are now being replaced by liquid crystal display (LCD) screens which are lighter, easier to use, and are capable of higher screen resolution
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

6. Screens/Visual Display Units
Cathode Ray Tube (CRT) monitor
Liquid Crystal Display (LCD) monitor

7. Plotters
Plotters are specially optimised to produce technical graphics (e.g. graphs, plans, maps, and designs)
They use special pen-like heads to ‘draw’ the output
There are two main types of plotter:
Flatbed potters: suitable for producing small scale technical drawings
Drum plotters: suitable for producing large drawings
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

8. Plotters
Flatbed plotter
Drum plotter

9. Speakers and headphones
Speakers and headphones are central to any multimedia system
Audio output is integral to video, watching television or listening to radio via a webcast, multimedia presentations, websites, and interactive learning packages
Unit 1 Topic b - Output devices - Screens, plotters, and speakers

10. AS Level ICT
Selection and use of output methods, media, and devices: Screens, plotters, and speakers
Unit 1 Topic b - Output devices - Screens, plotters, and speakers