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An important difference between CRT monitors and LCD panels is that the former require an analog signal to produce a picture and the latter require a digital signal. This is why the set-up of an LCD’s clock and phase controls is critical to obtain the best possible display quality. It also creates difficulties for panels that do not possess automatic setup features and require these adjustments to be made manually. The problem occurs when LCD panels are used with legacy graphics generators, which have analog outputs. In this situation the graphics signal is generated digitally inside the PC, converted by the graphics card to an analog signal, then fed to the LCD panel where it has to be converted back into a digital signal. For the whole process to work properly, the two converters must be adjusted so that their clocks are running at the same frequency and phase. This requires that the clock and phase for the converter in the LCD panel continuously be adjusted to match with the graphics card.
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