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VIDEO CARDS

Video Hardware, Part 2
By: Addison-Wesley/Prentice Hall PTR
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    2004-11-17

    Table of Contents:
  • Video Hardware, Part 2
  • Energy and Safety
  • Emissions
  • Refresh Rates (Vertical Scan Frequency)
  • Horizontal Frequency
  • Testing a Display
  • Maintaining Your Monitor
  • Video Display Adapters
  • Video Graphics Array
  • Super VGA

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    Video Hardware, Part 2


    (Page 1 of 10 )

    This week we continue our look at monitors, and delve into power management, refresh rates, frequencies, and more. This is the second part of chapter 15 of Scott Mueller's Upgrading and Repairing PCs (16th ed., Que, ISBN 0789731738).

    Upgrading and Repaiding PCsImage Brightness and Contrast (LCD Panels)

    As previously mentioned, dot pitch is not a factor in deciding which LCD panel to purchase. Although it's a consideration that applies to both LCDs and CRTs, the brightness of a display is especially important in judging the quality of an LCD panel.

    Although a dim CRT display is almost certainly a sign of either improper brightness control or a dying monitor, brightness in LCD panels can vary a great deal from one model to another. Brightness for LCD panels is measured in candelas per square meter, which is abbreviated "nt" and pronounced as a nit. Typical ratings for good display panels are between 200 and 400 nits, but the brighter the better. A good combination is a rating of 250 nits or higher and a contrast rating of 300:1 or higher.


    Note -When you evaluate an LCD TV monitor, be sure to note the brightness settings available in computer mode and TV mode. Many of these displays provide a brighter picture in TV mode than in computer mode.


    Interlaced Versus Noninterlaced

    Monitors and video adapters can support interlaced or noninterlaced resolution. In noninterlaced (conventional) mode, the electron beam sweeps the screen in lines from top to bottom, one line after the other, completing the screen in one pass. In interlaced mode, the electron beam also sweeps the screen from top to bottom, but it does so in two passes—sweeping the odd lines first and the even lines second. Each pass takes half the time of a full pass in noninterlaced mode. Early high-resolution monitors, such as the IBM 8514/A, used interlacing to reach their maximum resolutions, but all recent and current high-resolution (1,024x768 and higher) monitors are noninterlaced, avoiding the slow screen response and flicker caused by interlacing.

    For more information about interlaced displays, see "Interlaced Versus Noninterlaced" in Chapter 15 of Upgrading and Repairing PCs, 12th Edition , included in electronic form on the disc accompanying this book.

    Buy the book!

    This chapter is from Upgrading and Repairing PCs, 16th edition,by Scott Mueller. (Que Books, 2004, ISBN: 0789731738).  Check it out at your favorite bookstore today.

    Buy this book now!

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