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LCD monitors lack the color saturation and contrast of a CRT, making CRT the choice for graphic artists Look for an LCD monitor with a contrast ratio of 450:1 or higher Projectors come in two main varieties: rear-view and front-view Rear-view projectors shoot an image onto a screen from the back and are almost always self enclosed They are a popular choice for televisions, but not for PCs Front-view projectors shoot an image from the front and are widely used during computer presentations LCD projectors, like LCD monitors, have a native resolution and are lightweight, but lack the image quality of a CRT Projector brightness is measured in lumens Larger numbers are brighter and better, with 1500 lumens being sufficient for a small dark room The size of the projected image at a certain distance from the screen is the projector s throw LCD projectors come with internal fans, which cool the lamp Lamps are very costly to replace and are considered consumable (meaning you can expect to replace them periodically) Measured from two opposite diagonal corners, size for CRT monitors is not usually the same as the viewable image size A 17-inch CRT monitor might have only a 155-inch VIS Because LCD monitors report only VIS, a 15-inch LCD monitor may have approximately the same viewing area as a 17-inch CRT CRT monitors require two connectors: a 15-pin, 3-row DB connector and a power plug Video cards use a RAMDAC that takes the digital signal from the video card and turns it into an analog signal for the CRT LCD monitors require a digital signal Analog LCD monitors reverse the effects of the RAMDAC and allow you to plug your LCD monitor into the 15-pin VGA connector on the video card The DVI standard enables an LCD monitor to use the digital signal from a PC without any digitalto-analog-and-back-to-digital conversion The DVI standard includes DVI-D, DVI-A, and DVI-I DVI-D and DVI-I come in single-link and dual-link
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varieties, with dual-link offering significantly higher resolutions
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Monitors have adjustment controls for brightness, contrast, image size and position, and color adjustment These controls are usually accessed via an onboard menu system rather than hardware knobs or dials A CRT monitor accounts for about half of the power consumption of a desktop PC Monitors using the VESA specification for display powermanagement signaling can cut monitor power consumption by about 75 percent An LCD monitor uses less than half the electricity that a CRT uses
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The video card has two major pieces: the video RAM and the video processing circuitry The video RAM stores the video image; the processing circuitry is similar to that of your computer s CPU The combination of a specific resolution and color depth is referred to as a mode The VGA mode is defined by a resolution of 640 480 and 4-bit color depth (16 colors) Modern video cards and monitors are capable of supporting many modes Using more color depth slows down video functions PCI slots maxed out at a bandwidth of 132 MBps The Accelerated Graphics Port (AGP) is better suited for video than PCI because it resides alone on its own bus, pipelines commands, and supports sidebanding and system memory access AGP cards are normally referred to by their strobe multiplier Although you can mix some AGP specifications, it is best to use an AGP card that is fully supported by your motherboard Make sure AGP cards are properly and fully inserted in the AGP port, as they require a close connection between card and port PCI Express video cards are becoming more popular and may soon replace AGP on all new systems Like AGP, PCIe supports sidebanding and system memory access; however, PCIe uses a faster serial communication method than AGP s parallel communication method
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