I have 2 computers here, both with very good monitors and both displaying the same effect:
1 x NEC MultiSync PA271W monitor
1 x Thinkpad X220 with IPS panel
Perhaps it is a result of the IPS panels in both? The NEC is a high-end monitor though and even with a cheaper IPS panel in the laptop I wouldn't expect to see any flaw that is the result of the monitor in the NEC.
You could try on a different monitor.