LCD monitors generally have either a Cold Cathode Fluorescent Lamp (CCFL) or an LED backlight. The LED backlight allows the monitor to be thinner, and reduces the power consumption. However, low-end LED-backlit monitors generally use a "white" LED, which according to Wikipedia is actually a blue LED with a yellow phosphor, which would explain the blue tinge I've read about in comparison with CCFL-backlit monitors. High-end LED-backlit monitors like the HP DreamColor LP2480zx or the Samsung SyncMaster XL30 (both of which have been discontinued, but cost $2000+ when they were still available) used red, green, and blue LEDs to produce a better white than CCFL backlights.