LCD's, when to change?

I have had my LCD monitor (LG L1920P) for about 4 years. It is profiled regularly with an Eye-One Match. Looking at the profile graphs I have noticed that they have "bowed", I guess because of age? My question is how much "bowing" can be tolerated before "colour management" has trouble "correcting" the drift.
Is this the time to change?
Brian

Brian,
some thoughts:
The calibration is OK if the target values are confirmed
by the characterization. For instance:
Luminance 80..100cd/m2
Gamma 2.2
Color temperature 6500K
Somewhat 'bowed' LUT correction curves aren't harmful.
A few levels are lost, but this is normally not observable
in images.
The LUT corrections can be forced to almost linear
tone reproduction curves, if the monitor is adjusted by
monitor menues so, that the LUT doesn't have to correct
much. In other words, a pre-adjustment by trial and error
so, that the monitor is almost correct without LUTs.
Whether this is altogether better than a harsh correction
by LUTs is doubtful. But the benefit is this: not color
managed applications are shown reasonably.
After finishing the Calibration and the Characterization,
the result can be tested by patterns:
Either the PDF, which requires correct settings:
http://www.fho-emden.de/~hoffmann/caltutor270900.pdf
Or the HTML doc which works with generic settings:
http://www.fho-emden.de/~hoffmann/caltutor.html
Best regards --Gernot Hoffmann

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