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Figure 1726
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The bane of every projector is the lamp Lamps work hard in your projector, as they must generate a tremendous amount of light As a result, they generate quite a bit of heat, and all projectors come with a fan to keep the lamp from overheating When you turn off a projector, the fan will continue to run until the lamp is fully cooled Lamps are also very expensive, usually in the range of a few hundred dollars (US), which comes as a nasty shock to someone who s not prepared for that price when their lamp dies!
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Figure 1727
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LCD projector (photo courtesy of ViewSonic)
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CRT or LCD, all monitors share a number of characteristics that you need to know for purchase, installation, maintenance, and troubleshooting
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You need to take care when buying CRT monitors CRT monitors come in a large number of sizes, all measured in inches (although most metric
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17: Video
Figure 1728
countries provide the metric equivalent value) All monitors provide two numbers: the monitor size and the actual size of the screen The monitor size measures from two opposite diagonal corners The actual screen is measured from one edge of the screen to the opposite diagonal side This latter measurement is often referred to as the viewable image size (VIS) ; see Figure 1728 You will commonly see a size difference of one to two inches between the two measurements A 17-inch CRT monitor, for example, might have a 155-inch VIS Viewable image size of a CRT LCD monitors dispense with the two values and simply express the VIS value You must consider this issue when comparing LCDs to CRTs A 15-inch LCD monitor will have about the same viewing area as a 17-inch CRT
You ll often hear the terms flat-panel display or LCD panels to describe LCD monitors I prefer the term LCD monitor, but you should be prepared to hear it a few different ways
Connections
CRT monitors for PCs all use the famous 15-pin, three-row, DB-type connector (see Figure 1729) and a power plug Larger or multipurpose monitors may have a few other connectors, but as far as the CRT is concerned, these are the only two you need for video Unlike the analog CRTs, LCD monitors need a digital signal This creates somewhat of an issue The video information stored on a video card s RAM is clearly digital All VGA and better video cards include a special chip (or function embedded into a chip that does several other jobs) called the random access memory digital-to-analog converter (RAMDAC) As the name implies, RAMDAC takes the digital signal from the video card and turns it into an analog signal for the analog CRT (see Figure 1730) The RAMDAC really defines the bandwidth that the video card outputs Well, RAMDACs certainly make sense for analog CRT monitors However, if you want to plug your LCD monitor into a regular video card, you need circuitry on the LCD monitor to convert the signal from analog to digital (see Figure 1731) Many LCD monitors use exactly this process These are called analog LCD monitors The monitor really isn t analog; it s digital, but it takes a standard VGA input These monitors have one advantage: You may use any standard VGA video card But these monitors require adjustment of the analog timing signal to the digital clock inside the monitor This used to be a fairly painful process, but most analog LCD monitors now include intelligent circuitry to make this process either automatic or very easy Why convert the signal from digital to analog and then back to digital Well, many monitor and video card people agree We now see quite a few digital LCD monitors and digital video cards They use a completely different connector than the old 15-pin DB connector used on analog video cards
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