Chapter 6: Output - PowerPoint PPT Presentation

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Chapter 6: Output

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  1. Chapter 6: Output Slides Created by Kevin McHale

  2. The Four Categories of Output • Output is data that has been processed into a useful device • Four Categories • Text • Graphics • Audio • Video

  3. CRT Monitors • Desktop monitors that are similar to televisions because they contain Cathode Ray Tubes (CRT) • Available in a variety of sizes • Most common range from 15 to 22 inches • Use electron beams to produce images

  4. Quality of CRT Monitor • Three factors affect the monitor’s quality • Resolution • Dot Pitch (Pixel Pitch) • Refresh Rate

  5. Graphics Cards • Converts digital output from the computer into an analog video signal • Sends the signal through a cable to the CRT monitor • Monitor displays the output on the screen • The number of colors a graphics card displays is determined by its bit depth

  6. Flat Panel Display • A flat panel display is a display with a shallow depth that does not use CRT technology • Types of flat panel displays • Flat panel monitors • LCD displays • Gas Plasma displays • HDTV displays

  7. Flat Panel Displays • A flat panel monitor is a desktop monitor that uses a liquid crystal display instead of a cathode-ray tube • A liquid crystal display (LCD) uses a liquid compound to present information on a screen

  8. Gas Plasma Displays • A gas plasma display uses gas plasma technology • Substitutes a layer of gas for the liquid crystal material in a flat panel monitor

  9. High-Definition Television • HDTV is the most advanced form of digital television • Provides resolution up to 1920 x 1080 pixels • Works with digital broadcasting signals • Transmits digital sound • Supports wide screens

  10. Printers • A printer is an output device that produces text and graphics on a physical medium • Two types of printers • Impact Printers • Nonimpact Printers

  11. Impact Printers • Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper • Types of Impact Printers • Dot-matrix printer • Line printer

  12. Nonimpact Printers • Nonimpact printers form characters and graphics on a piece of paper without actually striking the paper • Types of nonimpact printers • Ink-jet printers • Laser printers • Photo printers • Large format printers • Thermal printers • Portable printers • Label and postage printers • Plotters

  13. Nonimpact Printers • An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper • A photo printer produces photo-lab –quality pictures

  14. Nonimpact Printers (Cont) • A laser printer is a high-speed, high-quality printer that creates images using a laser beam and powdered ink, called toner • A thermal printer generates images by pushing electronically heated pins against heat sensitive paper

  15. Nonimpact Printers (Cont) • A portable printer is a small, lightweight, battery-powered printer used for notebook computers • A label printer is a small printer that prints on an adhesive-type material

  16. Nonimpact Printers (Cont) • Plotters are sophisticated printers used to produce high-quality drawings • A large-format printer uses ink-jet technology on a large scale to create photo- realistic-quality color prints

  17. Wireless Printing Technology • Infrared Printing • A printer communicates with a device using infrared light waves • Bluetooth Printing • A device transmits output to a printer via radio waves

  18. Audio Output Devices • Audio output devices are components of a computer that produce sound • Types of Audio Output Devices • Speakers • Headphones

  19. Fax • A fax machine (facsimile machine) is a device that transmits and receives documents over telephone lines • A fax is a document sent or received • Fax modems allow you to send and sometimes receive electronic documents as faxes

  20. Other Output Devices • Multifunction peripherals provide the functionality of a printer, scanner, copy machine, and a fax machine • Data projectors take the image form a computer screen and project it onto a larger screen for an audience to view

  21. Output Options • Hearing impaired users can instruct programs to display words instead of sound • Visually impaired users can enlarge items on the screen and change settings to increase readability • Blind users can work with voice output instead of a monitor and Braille printers