An LCD display's resolution is determined as much by the screen hardware as by the drivers and amount of installed video memory. Some machines with less robust screens achieve resolutions of 1024 × 600 (and even more) by using a virtual screen. This is a memory-swapping technique whereby a larger display is held in video memory while the actual screen displays the portion that fits into a 640 × 480 window. The cursor can be used to "pan" the image so that the viewable desktop is within the physical limits of the actual display.
As in regular desktop systems, color depth is affected by video memory. To operate any LCD display in 16-bit or 24-bit color mode, you must have sufficient video memory available. Portables usually have video adapter hardware permanently installed on the motherboard, which makes an upgrade of the display features virtually impossible. Most portables allow connection to an external monitor to increase video capabilities.
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