I currently have a NEC 3090WQXi 30" screen with Spectra view/i1 system purchased in April of 2010, what is the current life span of this monitors? When do I need to replace them if ever? Do they degrade overtime as CRT Monitors?
[simplification mode on] The principle source of CRT color degradation was the phosphors that converted the energy in the electron beam to light. The backlight of a fluorescent-lit LCD display is a set of tubes containing phosphors. The output light of those phosphors can be expected to change over time. The backlight of a LED-lit LCD display is a set of LEDs that use phosphors to convert blue to white light. The output light of those phosphors can be expected to change over time. In addition, the dyes in the LCD panel can be expected to change their characteristics over time. [simplification mode off]
It's possible to construct LCD backlights using red, green, and blue LEDs. There would be no phospor to degrade in that case, although LED output levels degrade over time.
All that being said, I've not seen a LCD panel degrade to the point where it couldn't be calibrated correctly, as used to happen with CRTs.