Mastering Computer Studies: Unleash Your Potential in Computer Science and Hardware
Output devices
​Classification of output devicesSoftcopy devices
When the emissive electroluminescent layer is polymeric, varying amounts of OLEDs can be deposited in rows and columns on a screen using simple "printing" methods to create a graphical color display, for use as computer displays, portable system screens, and in advertising and information board applications. OLED may also be used in lighting devices. OLEDs are available as distributed sources while the inorganic LEDs are point sources of light.
​Common names used with screen display
​Video Graphic Adaptors (VGA) or Video Card
Examples of video adaptors include:
​Sound output devices
Hard copy output devices
Hardcopy refers to tangible output that can be felt such as paper. Examples include: printers, plotters and facsimile (fax).
Printers
Classification according to printing mechanism
The coating turns black in the areas where it is heated, producing an image. Two-color direct thermal printers can print both black and an additional color (often red) by applying heat at two different temperatures.
They are mostly found in super markets to produce receipts.
These dye panels only have one color each, so for every print, there are four dye panels used: black, cyan, yellow, and magenta. The printing process involves individual dye sublimation on paper. For instance, when a photo is currently being printed, the color panels will be individually imprinted on the paper.
​Impact vs. non-impact printers​Classification of printers according to the speed of printing
​Character printers
Provide one character at a time and are hence comparatively slow and less costly than the line or page printers.
​Plotters
Exercise Questions
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