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Topic 2: Output

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  1. Topic 2: Output RobiatunAdawiah PCA0025 2010/2011

  2. Objectives Identify the different types of output devices Describe various ways to print Summarise the characteristics of LCDs, LCD screens and plasma monitors Differentiate between a non impact printers and an impact printers Describe the characteristics of a CRT monitor and factors that affect its quality Describe the uses of speakers, headphones and earphones Topic 2 - Output

  3. Output • Data that has been processed into a useful form • Categories of output Topic 2 - Output

  4. Output • Two kinds of output Hardcopy printed output Softcopy data that are kept in any storage media Topic 2 - Output

  5. Output devices Any hardware component that conveys information to one or more users printer Display device speaker Output Topic 2 - Output

  6. CRT Flat-panel display Computer Display Technology • Output device that visually conveys text, graphics, and video information • Information on display device sometimes called soft copy • Two types: • CRT • Flat-panel displays Topic 2 - Output

  7. Computer Display Technology • CRT monitor • Contains cathode-ray tube (CRT) • Screen coated with tiny dots of phosphor material • Phosphors are chemicals  emit light when exited by a stream of electron • Each dot consists of a red, blue, and green phosphor • These groups of phosphor dots make up a single pixel R G Pixel B Topic 2 - Output

  8. Computer Display Technology • Disadvantages • Generates more heat • Uses more power • Advantages • Less expensive Topic 2 - Output

  9. 600 vertical pixels Computer Display Technology • Quality of a CRT Monitor • Resolution • Number of horizontal and vertical pixels in a display device • Higher resolution makes image sharper, displays more text on screen, makes some elements smaller • E.g. 640x480, 800x600, 1024x768 800 horizontal pixels Total of 480,000 pixels on screen Topic 2 - Output

  10. Computer Display Technology • Refresh rate • Measured in Hertz (Hz) • Represents the number of frames displayed on the screen per second • Used to control flicker Example : If your CRT monitor has a refresh rate of 72 Hz, then it cycles through all the pixels from top to bottom 72 times per second. Topic 2 - Output

  11. Computer Display Technology • Dot pitch • Distance between two nearest-neighbor phosphor dots of the same color • The centre-to-centre distance between two nearest phosphors dots of the same color • The smaller the distance, the finer and better the display will be Topic 2 - Output

  12. Computer Display Technology • Flat-panel display • Lightweight display device  flat screen • Used by • LCD monitors and screen • Plasma monitor Topic 2 - Output

  13. Computer Display Technology • LCD monitor • Uses liquid crystal display • Images  sharp and flicker-free • Contain fluorescent tubes that emit light wave to the liquid crystal cells Topic 2 - Output

  14. Computer Display Technology • Produce color using • Active-matrix display (TFT-Thin Film Transistor) • A type of flat-panel display in which the screen is refreshed more frequently • Produce brighter, easy-to-read display, less expensive, require less power Topic 2 - Output

  15. Computer Display Technology • Plasma monitor • Uses gas plasma technology • When voltage is applied  gas releases UV light causes the pixels to glow and form images • Advantages: • Offers larger screen sizes • high-quality display Topic 2 - Output

  16. Printers • Output device that produces text and graphics on a physical medium • Result is hard copy, or printout • Printer resolution is measured by number of dots per inch (dpi). Topic 2 - Output

  17. Printers 300 dpi 600 dpi 1,200 dpi Topic 2 - Output

  18. Printers • Types of printers • Impact printer • Forms characters by striking mechanism against inked ribbon that contacts paper • Two types: • Dot matrix printer • Line printer Topic 2 - Output

  19. Impact Printers • Dot-matrix printer • Impact printer that produces printed images when tiny wire pins strike ribbon • Low quality carbon copy printing • Handle continuous - form paper and cheap Topic 2 - Output

  20. Impact Printers • Line printer • High-speed impact printer that prints entire line at a time • Speed measured in lines per minute (lpm) Topic 2 - Output

  21. Printers • Nonimpact printer • Forms characters and graphics without striking paper Topic 2 - Output

  22. Nonimpact Printer • Ink-jet printer • Sprays tiny drops of liquid ink onto paper Topic 2 - Output

  23. Nonimpact Printer • Laser printer • High-speed, high-quality nonimpact printer • Uses laser beam and powdered ink (toner) • Prints text and graphics in high-quality resolution, ranging from 1,200 to 2,400 dpi • Typically costs more than ink-jet printer, but is much faster Topic 2 - Output

  24. Nonimpact Printer • Photo printer • Color printer that produces photo-lab-quality pictures • Uses ink-jet technology • Thermal printer • Generates images by pushing electrically heated pins against heat-sensitive paper • Low print quality • Images tend to fade over time Topic 2 - Output

  25. Nonimpact Printer • Plotter • Sophisticated printer used to produce high-quality drawings • Prints maps, circuit diagrams, blueprints, signs, posters Topic 2 - Output

  26. Nonimpact Printer • Mobile printer • Small, lightweight, battery-powered printer that allows mobile user to print from notebook computer, Tablet PC, PDA, or smart phone while traveling • Uses ink-jet and thermal technology Topic 2 - Output

  27. Audio Output Device • Computer component that produces music, speech, or other sounds • Speakers, headphones, and earphones Topic 2 - Output

  28. Other Output Devices • Facsimile (fax) machine • Device that transmits and receives documents over telephone lines • Fax modem • Modem that allows you to send and receive electronic documents as faxes Topic 2 - Output

  29. Other Output Devices • Multifunction peripheral • Provides functionality of printer, scanner, copy machine, and fax machine Topic 2 - Output

  30. Other Output Devices • Data projector • Device that takes text and images from computer screen and projects them onto larger screen Topic 2 - Output

  31. That’s all forTopic 2 - Output Topic 2 - Output