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14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
14. Computer Systems   Output Devices
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14. Computer Systems Output Devices

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Transcript

  • 1. Output
  • 2. What Is Output?
    • Data that has been processed into useful form called information
      • Text
      • Graphics
      • Audio
      • Video
  • 3. Impact on Society
  • 4. What Are Output Devices?
    • Any computer component capable of conveying information to a user
      • Display devices
      • Printers
      • Other display devices
        • Data projectors
        • Fax machine
        • Multifunction devices
      • Terminals
  • 5. Display Devices
    • An output device that visually conveys text, graphics, and video information
    • CRT Monitors
      • Screen housed in a plastic or metal case
      • Cathode ray tube (CRT)
      • Picture elements (Pixels)
      • Viewable size
        • 17” monitor  15.7” viewable size
      • Colour vs. monochrome monitor
        • Colour monitor and colour depth
        • Monochrome monitor and gray scaling
  • 6.  
  • 7. Display Devices
    • Flat-panel displays
      • LCD displays
        • Lightweight
        • Used by handheld computers, digital watches, calculators
        • Active (TFT) and passive-matrix displays
          • Number of transistors
          • Cost, sharpness and clarity of images
          • Also used with desktop computers with space and weight constraints
  • 8. Display Devices
    • Flat-panel displays
      • Gas plasma
        • Large displays of up to 42” of viewable area
        • Gas glows that produce pixels that form an image
        • Higher display quality
        • More expensive
  • 9.  
  • 10. Display Devices
    • Factors that affect monitor quality
      • Resolution
        • Related to the number of pixels it can display
        • Higher resolution
          • Increased sharpness
          • Smaller images
        • Number of columns of pixels X number of rows of pixels
      • Dot pitch
        • Vertical distance between each pixel on a monitor
        • Measure of image clarity
        • The smaller the distance between each pixel, the sharper the image
  • 11. Display Devices
    • Factors that affect monitor quality
      • Refresh rate
        • Speed that the monitor redraws images on the screen
        • Measured in Hertz (Hz) to measure flicker
        • The higher the refresh rate, the lower the flicker
      • Interlacing
        • Old method of refreshing images
  • 12. Display Devices
    • Video Cards
      • Graphics card, video adapter
      • Converts digital output into an analog video signal that is sent through a cable to a monitor
      • Number of colours  number of bits used to store information about each pixel
        • 8-bit card (2 8 colours = 256 colours)
        • 24-bit card (2 24 colours = 16.7 million colours)
      • Video RAM
        • Memory to generate the resolution and number of colours you want to display
  • 13. Video Card Display
  • 14. Video Standards
  • 15. Display Devices
    • Monitor Ergonomics
      • Incorporate comfort, efficiency and safety into the design of items in the workplace
        • Digital controls help fine-tune the display
        • Tilt-and-swivel base to minimise neck strain and reduce glare
        • MPR II standard regarding electromagnetic radiation (EMR)
        • ENERGY STAR program to create energy-efficient monitors
  • 16. Display Devices
    • High-Definition Television
      • Uses digital television signals
      • Can be used as a monitor while browsing the Internet
      • Monitor come TV
      • HDTV
  • 17. Printers
    • An output device that produces text and graphics on a physical medium such as paper or transparency film
      • Hard copy (printout) vs. softcopy (monitor)
      • Portrait vs. landscape
      • Printing requirements vary
  • 18. Printers
    • Impact Printers
      • Printing mechanism strikes paper, ribbon and character together
      • Near letter quality (NLQ)
      • Used for multipart forms
        • strikes through multiple layers of paper
  • 19. Printers
    • Impact Printers
      • Dot matrix printers
        • Small dots form characters
        • Continuous form paper
        • More pins on print head means higher quality
        • Speed measured in characters per second (cps)
  • 20. Printers
    • Impact Printers
      • Line printers
        • High speed
        • Prints an entire line at a time
        • Band printer
        • Shuttle-matrix printer
  • 21. Printers
    • Non-impact Printers
      • No mechanism strikes the paper
      • Much quieter than impact printers
      • Ink-jet printers
        • Spray tiny drops of ink onto the paper
        • Both black-and-white and colour
        • Resolution measured in dots per inch (dpi)
        • Speed measured in pages per minute (ppm)
        • Nozzles spray ink
  • 22. Printers
    • Non-impact Printers
      • Laser printers
        • High-speed, high-quality non-impact printer
        • Very high quality resolution - 300dpi to 1,200 dpi
        • Stores entire page before printing it
        • Page description language (PDL)
          • PCL (Printer Control Language)
          • Postscript
        • Operates much like a copy machine
        • Toner
        • Replace cartridge
  • 23.  
  • 24. Printers
    • Non-impact Printers
      • Thermal printers
        • Pushes electrically heated pins against heat-sensitive paper
      • Thermal transfer printer
        • Print head heats and melts the ink of the ink ribbon to print the dot-composed character on normal paper
  • 25. Printers
    • Non-impact Printers
      • Portable printers
        • Small, lightweight printer that allows a mobile user to print from a laptop or handheld computer while traveling
        • Ink-jet
        • Thermal
        • Parallel port or infrared port
  • 26. Printers
    • Non-impact Printers
      • Plotters and Large-Format Printers
        • Used for high-quality drawings such as blueprints, maps, circuit diagrams, and signs
        • Plotters
          • Pen plotters
          • Electrostatic plotters
        • Large-format printer
          • Photo-realistic quality color prints
  • 27. Printers
    • Non-impact Printers
      • Special-purpose printers
        • Snapshot printer
          • Photo lab quality pictures
        • Label printer
  • 28. Audio Output
    • Audio output devices
      • Produce music, speech, or other sounds
      • Speakers
        • Low-quality sound
        • For high quality sound
          • Stereo speakers and woofer
          • Sound card
      • Headsets
  • 29. Other Output Devices
    • Data projectors
      • Allows an audience to view output
      • LCD projectors
      • Digital light processing (DLP) projector
    • Facsimile (Fax) Machine
      • Used to transmit and receive an image of a document over a phone line
      • Stand-alone
      • Fax modem
        • Designed to transmit documents to a fax machine or to another fax modem
  • 30. Other Output Devices
    • Multifunction Devices
      • Can print, scan, copy, and fax
      • Less space
      • Lower cost than separate units
      • For example, OfficeJet by Hewlett-Packard is a colour printer, scanner and photocopier all in one device
  • 31. Terminals
    • Performs both input and output
      • Monitor
      • Keyboard
      • Video card
    • Dumb terminal
    • Intelligent (programmable) terminal
      • Modern PC
    • Point-of-sale (POS) terminal
    • Automatic teller machine (ATM)
  • 32. Output Devices For Physically Challenged Users
    • Issues with output devices
      • Cannot see graphics because of visual impairments
      • Cannot hear audio because of hearing impairment
    • Possible solutions
      • Windows Accessibility Properties dialog box
      • Braille printer
  • 33. Output Devices For Physically Challenged Users
  • 34. Output Device Users Guide
  • 35. Web Surfing for the Blind
  • 36. Computer Types and Architectural Characteristics
    • Personal computer (PC)
    • Workstation
    • General-purpose computer
    • Supercomputer
    • Microcomputer
    • Process control computer
  • 37. Personal Computer
    • Desktop
      • Meant to be placed on a desktop
    • Laptop
      • Portable computer which is slightly larger and heavier than a notebook computer
    • Notebook
      • A lightweight thin portable computer.
  • 38. Mini Tower and Monitor
  • 39. Notebooks (Mobile computing)
  • 40. Workstation
    • More powerful than the personal computers
      • Main applications are
        • Research and development fields
          • Complex scientific and engineering calculations
        • Product manufacturing fields
          • Used in CAD, CAM, etc application.
        • Software development field
          • Computer Aided Software Engineering tool
        • Communication network field
          • Client machines or server machines in distributed processing system.
  • 41. A Workstation
  • 42. Supercomputer
    • Capable of performing complex and large calculations at extremely high speed
    • Main use
      • Weather forecast
      • Simulation of nuclear power generation
      • Orbit calculation of artificial satellites
  • 43. Supercomputer Fujitsu VPP700E: 256 Fujitsu CMOS processing elements
  • 44. Microcomputer
    • A small computer with a microprocessor
    • Used in household appliances
    • Control data is recorded in ROM
    • Output devices are called actuators
      • Motors or switches
  • 45. Process Control Computer
    • Computers that control machines in heavy industries
      • Machines entirely automated through process control computers
    • Used in general building security system, highway traffic control, etc.
  • 46. General Purpose Computer (Mainframe)
    • A very large and powerful computer capable of supporting thousands of users simultaneously.
    • Mainframes are just below supercomputers in processing power
  • 47. Laptops
  • 48. Palmtops

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