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You probably bought a TN panel.
TN (Twisted Nematic): Without an ODC (overdriving circuit), this type of panel offers the fastest pixel response time. This does however come at the expensive of viewing angles and color fidelity. Out of all TFT-LCD panels, the TN type has the lowest contrast. It is also a 6-bit color depth panel, meaning dithering or frame rate control (FRC) must be employed to reach close to a full 8-bit depth. Pixels in their active state on a TN are black, while in their inactive, white.
There's a thread over at anandtech.com in video section of the forum there, you can find out all you need to know before buying a LCD monitor. You should do a little research before buying a LCD monitor, most people just buy crappy TN panels and think shit like this is normal for all LCD monitors.
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